Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Issuer	Date	Time CEST	Price (DKK)	Quantity	Venue
Genmab A/S	17/06/2024	9:03:30 AM	1,826.0000	22	XCSE
Genmab A/S	17/06/2024	9:03:30 AM	1,826.0000	24	XCSE
Genmab A/S	17/06/2024	9:03:30 AM	1,826.0000	22	XCSE
Genmab A/S	17/06/2024	9:03:30 AM	1,826.0000	24	XCSE
Genmab A/S	17/06/2024	9:03:30 AM	1,826.0000	53	XCSE
Genmab A/S	17/06/2024	9:03:30 AM	1,826.0000	22	XCSE
Genmab A/S	17/06/2024	9:03:30 AM	1,826.0000	12	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	94	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	50	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	44	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	6	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	44	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	44	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	50	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	94	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	6	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	67	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	21	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	23	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	21	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	21	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	21	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	21	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	31	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	31	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	31	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	32	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	31	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	32	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	62	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	13	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	81	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	9	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	85	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	58	XCSE
Genmab A/S	17/06/2024	9:05:47 AM	1,830.0000	89	XCSE
Genmab A/S	17/06/2024	9:08:21 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:21 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:21 AM	1,826.5000	1	AQEU
Genmab A/S	17/06/2024	9:08:21 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:21 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:21 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:21 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:22 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	4	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	8	CEUX

1

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	4	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	1	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	1	AQEU
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	11	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	9	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	4	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	12	CEUX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	5	TQEX
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	29	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	30	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	29	XCSE
Genmab A/S	17/06/2024	9:08:41 AM	1,826.5000	17	XCSE
Genmab A/S	17/06/2024	9:08:42 AM	1,825.0000	23	XCSE
Genmab A/S	17/06/2024	9:08:42 AM	1,825.0000	22	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	41	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	6	AQEU

2

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	41	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	41	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	4	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	41	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	40	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	7	TQEX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	45	XCSE
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	25	XCSE
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	45	XCSE
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	6	AQEU
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	41	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	5	CEUX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	6	AQEU
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	7	TQEX
Genmab A/S	17/06/2024	9:10:03 AM	1,824.0000	2	TQEX
Genmab A/S	17/06/2024	9:10:04 AM	1,824.0000	42	XCSE
Genmab A/S	17/06/2024	9:10:04 AM	1,824.0000	57	XCSE
Genmab A/S	17/06/2024	9:10:04 AM	1,824.0000	4	XCSE
Genmab A/S	17/06/2024	9:10:04 AM	1,824.0000	17	XCSE
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	18	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:10:04 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:13:04 AM	1,822.0000	52	XCSE
Genmab A/S	17/06/2024	9:13:04 AM	1,822.0000	207	XCSE
Genmab A/S	17/06/2024	9:13:04 AM	1,822.0000	48	CEUX
Genmab A/S	17/06/2024	9:13:04 AM	1,822.0000	52	XCSE
Genmab A/S	17/06/2024	9:13:04 AM	1,822.0000	52	XCSE
Genmab A/S	17/06/2024	9:13:04 AM	1,822.0000	48	CEUX
Genmab A/S	17/06/2024	9:13:28 AM	1,821.5000	46	XCSE
Genmab A/S	17/06/2024	9:13:28 AM	1,821.5000	77	XCSE
Genmab A/S	17/06/2024	9:13:28 AM	1,821.5000	14	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	39	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	158	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	22	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	2	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	35	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	35	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	12	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	35	CEUX

3

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	12	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	35	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	13	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	5	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	4	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	6	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	6	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	6	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	18	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	6	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	1	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,821.0000	4	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	19	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	4	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	14	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	23	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	23	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	16	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	7	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	10	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	13	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	23	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	23	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	4	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	4	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	22	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	22	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	6	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	2	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	2	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	1	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	4	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	16	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	16	CEUX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	3	AQEU
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	5	TQEX
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	12	XCSE
Genmab A/S	17/06/2024	9:14:19 AM	1,820.0000	15	XCSE

4

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:14:20 AM	1,820.0000	38	XCSE
Genmab A/S	17/06/2024	9:14:22 AM	1,820.0000	19	XCSE
Genmab A/S	17/06/2024	9:14:22 AM	1,820.0000	33	XCSE
Genmab A/S	17/06/2024	9:18:29 AM	1,819.0000	11	XCSE
Genmab A/S	17/06/2024	9:18:29 AM	1,819.0000	271	XCSE
Genmab A/S	17/06/2024	9:18:34 AM	1,817.0000	22	XCSE
Genmab A/S	17/06/2024	9:18:34 AM	1,817.0000	22	XCSE
Genmab A/S	17/06/2024	9:18:34 AM	1,817.0000	3	AQEU
Genmab A/S	17/06/2024	9:18:34 AM	1,817.0000	9	AQEU
Genmab A/S	17/06/2024	9:18:34 AM	1,817.0000	21	CEUX
Genmab A/S	17/06/2024	9:18:34 AM	1,817.0000	9	CEUX
Genmab A/S	17/06/2024	9:18:34 AM	1,817.0000	5	TQEX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	54	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	11	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	2	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	11	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	10	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	13	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,819.0000	12	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	22	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	22	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	22	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	22	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	18	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	21	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	3	AQEU
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	2	AQEU
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	18	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	1	AQEU
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	2	AQEU

5

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	3	AQEU
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	22	TQEX
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	51	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	15	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,818.0000	36	XCSE
Genmab A/S	17/06/2024	9:20:01 AM	1,817.5000	19	CEUX
Genmab A/S	17/06/2024	9:20:01 AM	1,817.5000	2	AQEU
Genmab A/S	17/06/2024	9:20:01 AM	1,817.5000	2	AQEU
Genmab A/S	17/06/2024	9:20:01 AM	1,817.5000	5	TQEX
Genmab A/S	17/06/2024	9:23:11 AM	1,818.0000	36	XCSE
Genmab A/S	17/06/2024	9:23:11 AM	1,818.0000	32	CEUX
Genmab A/S	17/06/2024	9:23:11 AM	1,818.0000	5	AQEU
Genmab A/S	17/06/2024	9:23:11 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:23:11 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:23:11 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:23:52 AM	1,819.5000	35	CEUX
Genmab A/S	17/06/2024	9:24:03 AM	1,819.5000	37	CEUX
Genmab A/S	17/06/2024	9:24:10 AM	1,818.5000	31	XCSE
Genmab A/S	17/06/2024	9:24:27 AM	1,819.5000	19	CEUX
Genmab A/S	17/06/2024	9:24:27 AM	1,819.5000	15	CEUX
Genmab A/S	17/06/2024	9:24:27 AM	1,819.5000	2	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	29	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	21	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	13	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	6	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	6	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	6	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	34	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	38	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	23	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	10	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	28	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	34	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	4	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	26	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	33	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	4	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	11	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	34	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	12	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	34	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	13	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU

6

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	6	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	6	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	6	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	5	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	4	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	6	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,818.5000	4	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	23	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	21	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	36	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	10	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	21	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	23	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	2	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	21	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	20	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	3	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	2	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	21	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	20	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	21	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	20	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	1	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	1	CEUX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	3	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	2	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	3	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	2	AQEU
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	4	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	1	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	5	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	5	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	5	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	2	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	2	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	1	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	2	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	3	TQEX
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	17	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	35	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	14	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	48	XCSE
Genmab A/S	17/06/2024	9:25:38 AM	1,817.5000	21	XCSE
Genmab A/S	17/06/2024	9:28:28 AM	1,818.0000	12	CEUX
Genmab A/S	17/06/2024	9:28:34 AM	1,818.0000	13	CEUX

7

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:28:34 AM	1,818.0000	25	CEUX
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	5	CEUX
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	1	AQEU
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	5	AQEU
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	1	AQEU
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	5	TQEX
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	5	TQEX
Genmab A/S	17/06/2024	9:30:14 AM	1,819.0000	8	XCSE
Genmab A/S	17/06/2024	9:30:25 AM	1,819.0000	1	AQEU
Genmab A/S	17/06/2024	9:30:25 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:25 AM	1,819.0000	5	TQEX
Genmab A/S	17/06/2024	9:30:25 AM	1,819.0000	8	XCSE
Genmab A/S	17/06/2024	9:30:25 AM	1,819.0000	3	XCSE
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	71	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	5	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	9	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	8	CEUX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	5	TQEX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	12	TQEX
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	8	XCSE
Genmab A/S	17/06/2024	9:30:33 AM	1,819.0000	84	XCSE
Genmab A/S	17/06/2024	9:30:42 AM	1,819.5000	69	CEUX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.5000	10	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.5000	1	TQEX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.5000	31	XCSE
Genmab A/S	17/06/2024	9:30:42 AM	1,819.5000	46	XCSE
Genmab A/S	17/06/2024	9:30:42 AM	1,819.5000	10	CEUX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	20	CEUX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	20	CEUX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	5	TQEX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	20	CEUX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU

8

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	20	CEUX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	2	AQEU
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	1	TQEX
Genmab A/S	17/06/2024	9:30:42 AM	1,819.0000	21	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	1	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	12	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	6	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	5	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	5	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	5	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	1	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	58	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	2	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	6	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	3	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	6	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	7	CEUX
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	11	XCSE
Genmab A/S	17/06/2024	9:33:34 AM	1,823.5000	4	XCSE
Genmab A/S	17/06/2024	9:35:11 AM	1,823.5000	4	XCSE
Genmab A/S	17/06/2024	9:35:52 AM	1,825.5000	13	XCSE
Genmab A/S	17/06/2024	9:35:52 AM	1,825.5000	92	XCSE
Genmab A/S	17/06/2024	9:35:52 AM	1,825.5000	13	CEUX
Genmab A/S	17/06/2024	9:35:52 AM	1,825.5000	13	CEUX
Genmab A/S	17/06/2024	9:35:52 AM	1,825.5000	13	XCSE
Genmab A/S	17/06/2024	9:35:52 AM	1,825.5000	13	CEUX

9

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:35:53 AM	1,825.5000	13	CEUX
Genmab A/S	17/06/2024	9:35:53 AM	1,825.5000	13	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	5	TQEX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	5	TQEX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	35	TQEX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	10	XCSE
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	86	XCSE
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	10	XCSE
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	16	XCSE
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	11	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	8	CEUX
Genmab A/S	17/06/2024	9:36:15 AM	1,825.5000	4	XCSE
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	10	XCSE
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	48	XCSE
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	52	CEUX
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	52	CEUX
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	52	CEUX
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	52	CEUX
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	17	CEUX
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	58	XCSE
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	15	XCSE
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	50	CEUX
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	2	CEUX
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	30	XCSE
Genmab A/S	17/06/2024	9:38:12 AM	1,825.0000	37	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	42	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	54	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	2	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	2	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	1	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	14	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	5	TQEX

10

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	14	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	14	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	14	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	7	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	106	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	7	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	17	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	38	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	7	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	6	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	9	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	2	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	18	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	6	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	2	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,823.0000	8	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	15	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	7	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	20	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	22	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	2	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	2	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	2	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	23	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	21	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	8	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	44	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	6	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	21	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	9	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	21	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	4	XCSE
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	6	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	9	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	12	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	2	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	AQEU
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX

11

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	7	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	20	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	5	TQEX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	43	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	10	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	11	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	34	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	3	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	7	CEUX
Genmab A/S	17/06/2024	9:40:39 AM	1,822.5000	25	CEUX
Genmab A/S	17/06/2024	9:44:02 AM	1,817.5000	2	CEUX
Genmab A/S	17/06/2024	9:44:02 AM	1,817.5000	19	CEUX
Genmab A/S	17/06/2024	9:44:02 AM	1,817.5000	5	TQEX
Genmab A/S	17/06/2024	9:44:02 AM	1,817.5000	23	XCSE
Genmab A/S	17/06/2024	9:44:02 AM	1,817.5000	45	XCSE
Genmab A/S	17/06/2024	9:44:02 AM	1,817.5000	10	XCSE
Genmab A/S	17/06/2024	9:44:02 AM	1,817.5000	18	CEUX
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	56	XCSE
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	51	CEUX
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	51	CEUX
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	8	AQEU
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	8	AQEU
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	7	TQEX
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	7	TQEX
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	56	XCSE
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	23	XCSE
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	21	CEUX
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	30	XCSE
Genmab A/S	17/06/2024	9:47:05 AM	1,818.5000	30	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	43	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	8	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	6	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	37	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	37	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	6	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	37	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	43	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	43	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	13	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	30	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	19	XCSE
Genmab A/S	17/06/2024	9:49:06 AM	1,821.0000	7	XCSE
Genmab A/S	17/06/2024	9:50:20 AM	1,818.0000	1	XCSE
Genmab A/S	17/06/2024	9:50:21 AM	1,818.0000	15	CEUX
Genmab A/S	17/06/2024	9:50:21 AM	1,818.0000	15	CEUX

12

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:50:21 AM	1,818.0000	2	AQEU
Genmab A/S	17/06/2024	9:50:21 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:50:21 AM	1,818.0000	5	TQEX
Genmab A/S	17/06/2024	9:50:21 AM	1,818.0000	13	XCSE
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	61	XCSE
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	9	XCSE
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	55	CEUX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	10	CEUX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	10	CEUX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	10	CEUX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	10	CEUX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	9	CEUX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	8	AQEU
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	1	AQEU
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	1	AQEU
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	8	AQEU
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	2	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	7	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	5	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	2	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	5	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	7	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	5	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	7	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	5	TQEX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	9	XCSE
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	34	XCSE
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	36	CEUX
Genmab A/S	17/06/2024	9:51:54 AM	1,818.5000	8	AQEU
Genmab A/S	17/06/2024	9:53:10 AM	1,818.0000	36	XCSE
Genmab A/S	17/06/2024	9:53:10 AM	1,818.0000	47	CEUX
Genmab A/S	17/06/2024	9:53:11 AM	1,818.0000	16	XCSE
Genmab A/S	17/06/2024	9:53:11 AM	1,818.0000	47	CEUX
Genmab A/S	17/06/2024	9:53:11 AM	1,818.0000	7	TQEX
Genmab A/S	17/06/2024	9:53:11 AM	1,818.0000	52	XCSE
Genmab A/S	17/06/2024	9:53:11 AM	1,818.0000	14	XCSE
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	10	XCSE
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	58	XCSE
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	10	CEUX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	10	CEUX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	8	CEUX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	10	CEUX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	10	CEUX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	1	AQEU
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	8	AQEU
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	5	TQEX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	8	TQEX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	5	TQEX
Genmab A/S	17/06/2024	9:54:39 AM	1,817.0000	26	CEUX

13

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	9:54:40 AM	1,817.0000	26	CEUX
Genmab A/S	17/06/2024	9:54:40 AM	1,817.0000	17	CEUX
Genmab A/S	17/06/2024	9:54:40 AM	1,817.0000	10	CEUX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	20	XCSE
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	46	XCSE
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	19	CEUX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	19	CEUX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	19	CEUX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	3	CEUX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	2	AQEU
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	8	AQEU
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	5	TQEX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	17	TQEX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.5000	5	TQEX
Genmab A/S	17/06/2024	9:55:04 AM	1,815.0000	21	XCSE
Genmab A/S	17/06/2024	9:55:04 AM	1,815.0000	20	XCSE
Genmab A/S	17/06/2024	9:55:04 AM	1,815.0000	42	XCSE
Genmab A/S	17/06/2024	9:55:04 AM	1,815.0000	46	XCSE
Genmab A/S	17/06/2024	9:55:05 AM	1,815.5000	46	XCSE
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	20	CEUX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	20	CEUX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	20	CEUX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	20	CEUX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	19	CEUX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	20	CEUX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	1	CEUX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	2	AQEU
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	5	TQEX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	5	TQEX
Genmab A/S	17/06/2024	9:55:05 AM	1,815.5000	7	XCSE
Genmab A/S	17/06/2024	9:55:05 AM	1,815.0000	17	CEUX
Genmab A/S	17/06/2024	9:58:11 AM	1,809.5000	20	XCSE
Genmab A/S	17/06/2024	9:58:11 AM	1,809.5000	23	XCSE
Genmab A/S	17/06/2024	9:58:11 AM	1,809.5000	12	CEUX
Genmab A/S	17/06/2024	9:58:11 AM	1,809.5000	7	CEUX
Genmab A/S	17/06/2024	9:58:11 AM	1,809.5000	2	AQEU
Genmab A/S	17/06/2024	9:58:11 AM	1,809.5000	5	TQEX
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	8	XCSE

14

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	47	XCSE
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	3	TQEX
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	1	CEUX
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	1	AQEU
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	2	TQEX
Genmab A/S	17/06/2024	10:00:08 AM	1,810.5000	3	XCSE
Genmab A/S	17/06/2024	10:00:20 AM	1,809.5000	23	XCSE
Genmab A/S	17/06/2024	10:00:20 AM	1,809.5000	6	XCSE
Genmab A/S	17/06/2024	10:00:20 AM	1,809.5000	23	XCSE
Genmab A/S	17/06/2024	10:00:20 AM	1,809.5000	15	CEUX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	37	CEUX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	20	CEUX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	15	CEUX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	AQEU
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	AQEU
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	TQEX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	2	CEUX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	AQEU
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	AQEU
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	AQEU
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	AQEU
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	TQEX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	1	TQEX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	42	XCSE
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	42	XCSE
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	17	XCSE
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	19	CEUX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	AQEU
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	6	TQEX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	10	TQEX
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	12	XCSE
Genmab A/S	17/06/2024	10:01:18 AM	1,810.0000	7	XCSE
Genmab A/S	17/06/2024	10:02:23 AM	1,807.0000	89	CEUX
Genmab A/S	17/06/2024	10:02:23 AM	1,807.0000	13	AQEU
Genmab A/S	17/06/2024	10:02:23 AM	1,807.0000	13	TQEX
Genmab A/S	17/06/2024	10:02:23 AM	1,807.0000	98	XCSE
Genmab A/S	17/06/2024	10:03:52 AM	1,806.5000	22	CEUX
Genmab A/S	17/06/2024	10:03:52 AM	1,806.5000	22	CEUX
Genmab A/S	17/06/2024	10:03:52 AM	1,806.5000	4	TQEX
Genmab A/S	17/06/2024	10:04:22 AM	1,806.5000	43	CEUX
Genmab A/S	17/06/2024	10:04:22 AM	1,806.5000	51	XCSE
Genmab A/S	17/06/2024	10:04:22 AM	1,806.5000	7	XCSE
Genmab A/S	17/06/2024	10:04:22 AM	1,806.5000	9	CEUX
Genmab A/S	17/06/2024	10:04:22 AM	1,806.5000	8	AQEU
Genmab A/S	17/06/2024	10:04:22 AM	1,806.5000	8	TQEX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	20	CEUX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	51	XCSE

15

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	38	XCSE
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	4	XCSE
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	42	XCSE
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	27	CEUX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	11	CEUX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	36	CEUX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	20	CEUX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	10	CEUX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	2	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	TQEX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	TQEX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	TQEX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	9	AQEU
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	9	TQEX
Genmab A/S	17/06/2024	10:06:23 AM	1,809.0000	7	TQEX
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	25	CEUX
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	43	CEUX
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	10	AQEU
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	10	TQEX
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	60	XCSE
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	75	XCSE
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	21	XCSE
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	39	XCSE
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	11	XCSE
Genmab A/S	17/06/2024	10:08:52 AM	1,811.0000	36	XCSE
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	21	CEUX
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	6	CEUX
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	4	TQEX
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	28	XCSE
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	2	XCSE
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	15	XCSE
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	17	CEUX
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	4	AQEU
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	1	TQEX
Genmab A/S	17/06/2024	10:10:25 AM	1,810.5000	4	TQEX
Genmab A/S	17/06/2024	10:11:28 AM	1,810.0000	24	XCSE
Genmab A/S	17/06/2024	10:12:00 AM	1,809.5000	22	XCSE
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	74	CEUX
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	70	CEUX
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	21	AQEU
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	22	TQEX
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	161	XCSE
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	6	XCSE

16

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	20	XCSE
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	27	XCSE
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	12	XCSE
Genmab A/S	17/06/2024	10:12:55 AM	1,810.5000	13	XCSE
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	3	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	36	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	1	TQEX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	7	TQEX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	XCSE
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	7	XCSE
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	2	XCSE
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	XCSE
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	XCSE
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	XCSE
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	18	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	5	CEUX
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	9	AQEU
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:15:04 AM	1,810.5000	2	TQEX
Genmab A/S	17/06/2024	10:16:25 AM	1,811.0000	19	XCSE
Genmab A/S	17/06/2024	10:16:25 AM	1,811.0000	4	XCSE
Genmab A/S	17/06/2024	10:16:25 AM	1,811.0000	4	XCSE
Genmab A/S	17/06/2024	10:16:25 AM	1,811.0000	19	XCSE
Genmab A/S	17/06/2024	10:17:24 AM	1,810.5000	10	XCSE
Genmab A/S	17/06/2024	10:17:31 AM	1,810.5000	15	XCSE
Genmab A/S	17/06/2024	10:17:31 AM	1,810.5000	10	XCSE
Genmab A/S	17/06/2024	10:17:31 AM	1,810.5000	25	XCSE
Genmab A/S	17/06/2024	10:17:31 AM	1,810.5000	25	XCSE
Genmab A/S	17/06/2024	10:17:31 AM	1,810.5000	25	XCSE
Genmab A/S	17/06/2024	10:17:31 AM	1,810.5000	3	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	3	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	17	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	5	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	13	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	4	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU

17

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	21	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	20	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	7	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	21	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	4	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	17	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	13	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	9	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	9	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	2	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	9	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	9	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	12	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	2	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	5	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	13	XCSE
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	21	CEUX
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	2	AQEU
Genmab A/S	17/06/2024	10:18:34 AM	1,809.5000	5	TQEX
Genmab A/S	17/06/2024	10:18:34 AM	1,810.5000	9	XCSE
Genmab A/S	17/06/2024	10:20:02 AM	1,811.0000	43	XCSE
Genmab A/S	17/06/2024	10:20:02 AM	1,811.0000	39	CEUX
Genmab A/S	17/06/2024	10:20:02 AM	1,811.0000	6	TQEX
Genmab A/S	17/06/2024	10:21:54 AM	1,810.5000	21	XCSE
Genmab A/S	17/06/2024	10:21:54 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:21:54 AM	1,810.5000	21	XCSE
Genmab A/S	17/06/2024	10:21:54 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:21:54 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:21:54 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:21:54 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	20	XCSE
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	1	XCSE
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	8	CEUX

18

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	3	CEUX
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	1	AQEU
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	1	TQEX
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	21	XCSE
Genmab A/S	17/06/2024	10:21:55 AM	1,810.5000	12	XCSE
Genmab A/S	17/06/2024	10:21:56 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:21:56 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:21:56 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:21:56 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:21:56 AM	1,810.5000	21	XCSE
Genmab A/S	17/06/2024	10:23:43 AM	1,811.0000	37	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	3	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	1	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	1	AQEU
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	1	AQEU
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	6	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	11	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX

19

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	2	CEUX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	5	TQEX
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:51 AM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	10:23:52 AM	1,810.5000	9	AQEU
Genmab A/S	17/06/2024	10:23:52 AM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	10:23:52 AM	1,810.5000	9	TQEX
Genmab A/S	17/06/2024	10:23:52 AM	1,810.5000	2	TQEX
Genmab A/S	17/06/2024	10:23:52 AM	1,810.5000	20	XCSE
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	38	CEUX
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	3	CEUX
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	7	CEUX
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	6	AQEU
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	1	TQEX
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	5	TQEX
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	42	XCSE
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	5	XCSE
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	5	XCSE
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	36	CEUX
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	24	CEUX
Genmab A/S	17/06/2024	10:25:03 AM	1,811.0000	18	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	19	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	19	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	17	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	20	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	39	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	4	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	12	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	7	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	20	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	12	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	3	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	3	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	1	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	3	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	2	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	4	TQEX

20

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	19	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	22	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	17	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	10	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	10	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	3	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	3	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	2	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	1	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	46	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	22	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	45	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	6	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	45	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	19	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,809.0000	7	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	13	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	12	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	50	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	8	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.5000	9	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	23	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	23	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	8	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	8	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	3	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	3	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	13	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	4	XCSE
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	5	CEUX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	3	AQEU
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	5	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	26	TQEX
Genmab A/S	17/06/2024	10:26:55 AM	1,808.0000	35	CEUX
Genmab A/S	17/06/2024	10:32:41 AM	1,806.0000	27	XCSE
Genmab A/S	17/06/2024	10:32:41 AM	1,806.0000	20	CEUX
Genmab A/S	17/06/2024	10:32:41 AM	1,806.0000	15	TQEX
Genmab A/S	17/06/2024	10:32:42 AM	1,806.0000	27	XCSE
Genmab A/S	17/06/2024	10:32:42 AM	1,806.0000	23	XCSE
Genmab A/S	17/06/2024	10:32:42 AM	1,806.0000	9	XCSE
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	42	CEUX

21

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	3	CEUX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	6	AQEU
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	6	AQEU
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	7	TQEX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	7	TQEX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	47	XCSE
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	49	XCSE
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	7	TQEX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	39	CEUX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	2	CEUX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	6	AQEU
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	6	AQEU
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	7	TQEX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	7	TQEX
Genmab A/S	17/06/2024	10:33:43 AM	1,806.0000	31	CEUX
Genmab A/S	17/06/2024	10:35:11 AM	1,805.5000	36	XCSE
Genmab A/S	17/06/2024	10:35:11 AM	1,805.5000	33	CEUX
Genmab A/S	17/06/2024	10:36:13 AM	1,805.0000	10	XCSE
Genmab A/S	17/06/2024	10:36:13 AM	1,805.0000	46	XCSE
Genmab A/S	17/06/2024	10:36:13 AM	1,805.0000	46	XCSE
Genmab A/S	17/06/2024	10:36:13 AM	1,805.0000	10	XCSE
Genmab A/S	17/06/2024	10:36:13 AM	1,805.0000	46	XCSE
Genmab A/S	17/06/2024	10:38:12 AM	1,806.5000	9	XCSE
Genmab A/S	17/06/2024	10:38:12 AM	1,806.5000	9	XCSE
Genmab A/S	17/06/2024	10:38:12 AM	1,806.5000	53	XCSE
Genmab A/S	17/06/2024	10:38:12 AM	1,806.5000	47	XCSE
Genmab A/S	17/06/2024	10:38:14 AM	1,806.5000	12	CEUX
Genmab A/S	17/06/2024	10:38:14 AM	1,806.5000	12	XCSE
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	12	CEUX
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	12	XCSE
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	12	CEUX
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	12	CEUX
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	12	XCSE
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	12	XCSE
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	1	CEUX
Genmab A/S	17/06/2024	10:38:15 AM	1,806.5000	5	CEUX
Genmab A/S	17/06/2024	10:39:07 AM	1,807.0000	1	XCSE
Genmab A/S	17/06/2024	10:39:14 AM	1,807.0000	5	XCSE
Genmab A/S	17/06/2024	10:39:15 AM	1,807.0000	17	XCSE
Genmab A/S	17/06/2024	10:39:15 AM	1,807.0000	23	XCSE
Genmab A/S	17/06/2024	10:39:15 AM	1,807.0000	42	CEUX
Genmab A/S	17/06/2024	10:39:15 AM	1,807.0000	7	TQEX
Genmab A/S	17/06/2024	10:39:15 AM	1,807.0000	6	CEUX
Genmab A/S	17/06/2024	10:39:42 AM	1,806.5000	13	CEUX
Genmab A/S	17/06/2024	10:39:42 AM	1,806.5000	4	CEUX
Genmab A/S	17/06/2024	10:39:42 AM	1,806.5000	2	AQEU
Genmab A/S	17/06/2024	10:39:42 AM	1,806.5000	17	CEUX
Genmab A/S	17/06/2024	10:39:42 AM	1,806.5000	11	CEUX
Genmab A/S	17/06/2024	10:39:42 AM	1,806.5000	2	CEUX

22

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:39:42 AM	1,806.5000	5	TQEX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	42	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	55	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	31	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	31	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	20	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	30	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	21	CEUX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	20	CEUX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	3	AQEU
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	2	AQEU
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	2	AQEU
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	5	TQEX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	5	TQEX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	5	TQEX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	5	TQEX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	77	CEUX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	5	AQEU
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	6	AQEU
Genmab A/S	17/06/2024	10:40:17 AM	1,806.5000	12	TQEX
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	9	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	14	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	18	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	3	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	23	XCSE
Genmab A/S	17/06/2024	10:40:17 AM	1,806.0000	9	XCSE
Genmab A/S	17/06/2024	10:40:43 AM	1,803.0000	51	XCSE
Genmab A/S	17/06/2024	10:40:43 AM	1,803.0000	62	XCSE
Genmab A/S	17/06/2024	10:40:43 AM	1,803.5000	45	XCSE
Genmab A/S	17/06/2024	10:40:43 AM	1,803.5000	124	XCSE
Genmab A/S	17/06/2024	10:40:43 AM	1,803.0000	48	XCSE
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	10	XCSE
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	38	XCSE
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	4	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	7	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	1	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	1	AQEU
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	36	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	14	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	13	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	4	CEUX
Genmab A/S	17/06/2024	10:46:28 AM	1,802.5000	4	XCSE

23

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	5	TQEX
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	10	XCSE
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	10	XCSE
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	3	CEUX
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	4	CEUX
Genmab A/S	17/06/2024	10:49:05 AM	1,803.0000	10	XCSE
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	3	CEUX
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	10	XCSE
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	5	TQEX
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	10	XCSE
Genmab A/S	17/06/2024	10:49:07 AM	1,803.0000	13	XCSE
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	41	CEUX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	8	CEUX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	8	CEUX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	8	CEUX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	8	CEUX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	8	CEUX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	5	CEUX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	7	TQEX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	5	TQEX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	9	TQEX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	46	XCSE
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	8	XCSE
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	2	AQEU
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	5	TQEX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	7	TQEX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	5	TQEX
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	6	XCSE
Genmab A/S	17/06/2024	10:49:28 AM	1,802.0000	22	XCSE
Genmab A/S	17/06/2024	10:50:51 AM	1,805.5000	40	CEUX
Genmab A/S	17/06/2024	10:51:35 AM	1,805.5000	92	XCSE
Genmab A/S	17/06/2024	10:51:35 AM	1,805.5000	60	XCSE
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	14	CEUX
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	3	CEUX
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	17	CEUX
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	17	CEUX
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	14	CEUX
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	2	AQEU
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	2	AQEU
Genmab A/S	17/06/2024	10:51:35 AM	1,805.0000	5	TQEX
Genmab A/S	17/06/2024	10:51:37 AM	1,805.0000	54	XCSE
Genmab A/S	17/06/2024	10:51:37 AM	1,805.0000	17	XCSE
Genmab A/S	17/06/2024	10:51:37 AM	1,805.0000	17	XCSE

24

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	10:52:07 AM	1,803.5000	53	XCSE
Genmab A/S	17/06/2024	10:52:07 AM	1,803.5000	120	XCSE
Genmab A/S	17/06/2024	10:52:07 AM	1,803.0000	13	CEUX
Genmab A/S	17/06/2024	10:52:07 AM	1,803.0000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	29	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	26	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	3	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	26	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	29	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	AQEU
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	AQEU
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	17	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	20	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	11	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	20	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	11	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	31	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	30	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	12	XCSE
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	AQEU
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	AQEU
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	17	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	5	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	1	TQEX
Genmab A/S	17/06/2024	10:55:33 AM	1,803.5000	2	CEUX
Genmab A/S	17/06/2024	10:55:33 AM	1,802.5000	14	XCSE
Genmab A/S	17/06/2024	10:58:05 AM	1,803.5000	2	AQEU
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	16	XCSE
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	25	XCSE
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	25	XCSE
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	25	XCSE
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	12	XCSE
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	4	XCSE
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	4	XCSE
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	15	CEUX
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	17	CEUX
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	6	CEUX
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	2	AQEU
Genmab A/S	17/06/2024	10:58:45 AM	1,803.5000	4	TQEX

25

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	50	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	14	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	37	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	37	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	27	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	18	CEUX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	40	CEUX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	18	CEUX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	58	CEUX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	53	CEUX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	8	AQEU
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	8	AQEU
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	8	AQEU
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	8	AQEU
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	9	TQEX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	9	TQEX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	9	TQEX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	9	TQEX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	9	TQEX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	1	TQEX
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	33	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	4	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	4	XCSE
Genmab A/S	17/06/2024	11:01:04 AM	1,804.0000	12	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	27	XCSE
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	57	XCSE
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	38	XCSE
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	33	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	43	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	27	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	2	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	47	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	1	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	11	AQEU
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	11	AQEU
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	9	AQEU
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	12	TQEX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	6	TQEX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	6	TQEX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	12	TQEX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	47	XCSE
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	21	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,803.0000	2	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	21	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	5	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	14	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	5	CEUX

26

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	8	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	8	CEUX
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	2	AQEU
Genmab A/S	17/06/2024	11:05:30 AM	1,802.5000	2	AQEU
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	27	CEUX
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	27	CEUX
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	27	CEUX
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	12	CEUX
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	4	AQEU
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	40	AQEU
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	5	TQEX
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	41	TQEX
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	29	XCSE
Genmab A/S	17/06/2024	11:10:04 AM	1,804.0000	89	XCSE
Genmab A/S	17/06/2024	11:10:05 AM	1,804.0000	29	XCSE
Genmab A/S	17/06/2024	11:12:33 AM	1,803.0000	80	XCSE
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	10	CEUX
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	2	CEUX
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	2	AQEU
Genmab A/S	17/06/2024	11:12:33 AM	1,803.0000	72	CEUX
Genmab A/S	17/06/2024	11:12:33 AM	1,803.0000	11	AQEU
Genmab A/S	17/06/2024	11:12:33 AM	1,803.0000	11	TQEX
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	22	XCSE
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	20	XCSE
Genmab A/S	17/06/2024	11:12:33 AM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	11:12:34 AM	1,802.5000	22	XCSE
Genmab A/S	17/06/2024	11:12:34 AM	1,802.5000	9	XCSE
Genmab A/S	17/06/2024	11:16:27 AM	1,803.0000	25	CEUX
Genmab A/S	17/06/2024	11:16:27 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	11:16:47 AM	1,803.0000	24	CEUX
Genmab A/S	17/06/2024	11:16:47 AM	1,803.0000	2	AQEU
Genmab A/S	17/06/2024	11:16:47 AM	1,803.0000	5	TQEX
Genmab A/S	17/06/2024	11:17:00 AM	1,803.0000	12	CEUX
Genmab A/S	17/06/2024	11:17:00 AM	1,803.0000	11	AQEU
Genmab A/S	17/06/2024	11:17:00 AM	1,803.0000	11	TQEX
Genmab A/S	17/06/2024	11:17:00 AM	1,803.0000	1	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	26	CEUX
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	16	CEUX
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	29	CEUX
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	7	TQEX
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	7	TQEX
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	46	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	31	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.0000	20	CEUX
Genmab A/S	17/06/2024	11:17:10 AM	1,802.0000	20	CEUX

27

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	11:17:10 AM	1,802.0000	3	AQEU
Genmab A/S	17/06/2024	11:17:10 AM	1,802.0000	5	TQEX
Genmab A/S	17/06/2024	11:17:10 AM	1,802.0000	11	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.0000	11	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	30	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	38	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.5000	8	XCSE
Genmab A/S	17/06/2024	11:17:10 AM	1,802.0000	20	CEUX
Genmab A/S	17/06/2024	11:18:40 AM	1,801.5000	22	XCSE
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	55	CEUX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	50	CEUX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	5	CEUX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	4	CEUX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	8	AQEU
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	9	TQEX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	23	TQEX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	9	TQEX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	62	XCSE
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	5	XCSE
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	50	XCSE
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	7	XCSE
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	2	XCSE
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	27	CEUX
Genmab A/S	17/06/2024	11:20:05 AM	1,803.5000	9	AQEU
Genmab A/S	17/06/2024	11:20:06 AM	1,803.0000	63	XCSE
Genmab A/S	17/06/2024	11:20:06 AM	1,803.0000	7	XCSE
Genmab A/S	17/06/2024	11:20:07 AM	1,803.0000	13	XCSE
Genmab A/S	17/06/2024	11:23:26 AM	1,803.5000	6	CEUX
Genmab A/S	17/06/2024	11:23:48 AM	1,803.5000	27	XCSE
Genmab A/S	17/06/2024	11:23:48 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:23:48 AM	1,803.5000	31	XCSE
Genmab A/S	17/06/2024	11:23:48 AM	1,803.5000	53	XCSE
Genmab A/S	17/06/2024	11:23:48 AM	1,803.5000	19	CEUX
Genmab A/S	17/06/2024	11:23:48 AM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	11:24:33 AM	1,807.0000	24	XCSE
Genmab A/S	17/06/2024	11:24:33 AM	1,807.0000	38	XCSE
Genmab A/S	17/06/2024	11:24:33 AM	1,807.0000	24	XCSE
Genmab A/S	17/06/2024	11:24:34 AM	1,807.0000	24	XCSE
Genmab A/S	17/06/2024	11:24:34 AM	1,807.0000	12	XCSE
Genmab A/S	17/06/2024	11:24:39 AM	1,805.5000	21	XCSE
Genmab A/S	17/06/2024	11:24:41 AM	1,805.5000	23	XCSE
Genmab A/S	17/06/2024	11:24:41 AM	1,805.5000	44	XCSE
Genmab A/S	17/06/2024	11:24:41 AM	1,805.5000	44	XCSE
Genmab A/S	17/06/2024	11:24:41 AM	1,805.5000	12	XCSE
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	11	XCSE
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	33	XCSE
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	11	XCSE
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	64	XCSE

28

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	11	XCSE
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	64	XCSE
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	11	CEUX
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	11	CEUX
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	2	CEUX
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	11	XCSE
Genmab A/S	17/06/2024	11:28:26 AM	1,805.5000	26	XCSE
Genmab A/S	17/06/2024	11:28:32 AM	1,805.5000	5	CEUX
Genmab A/S	17/06/2024	11:28:32 AM	1,805.5000	11	XCSE
Genmab A/S	17/06/2024	11:28:33 AM	1,805.5000	11	XCSE
Genmab A/S	17/06/2024	11:29:23 AM	1,805.5000	16	XCSE
Genmab A/S	17/06/2024	11:29:29 AM	1,805.0000	52	XCSE
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	9	CEUX
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	7	TQEX
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	5	TQEX
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	50	XCSE
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	4	XCSE
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	36	XCSE
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	73	CEUX
Genmab A/S	17/06/2024	11:31:20 AM	1,805.0000	12	CEUX
Genmab A/S	17/06/2024	11:32:29 AM	1,804.5000	44	XCSE
Genmab A/S	17/06/2024	11:32:29 AM	1,804.5000	19	XCSE
Genmab A/S	17/06/2024	11:32:30 AM	1,804.5000	57	CEUX
Genmab A/S	17/06/2024	11:33:05 AM	1,804.5000	26	CEUX
Genmab A/S	17/06/2024	11:33:05 AM	1,804.5000	70	CEUX
Genmab A/S	17/06/2024	11:33:05 AM	1,804.5000	14	TQEX
Genmab A/S	17/06/2024	11:33:05 AM	1,804.5000	106	XCSE
Genmab A/S	17/06/2024	11:33:05 AM	1,804.5000	14	CEUX
Genmab A/S	17/06/2024	11:35:26 AM	1,803.5000	84	XCSE
Genmab A/S	17/06/2024	11:35:26 AM	1,803.5000	138	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	70	CEUX
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	91	CEUX
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	10	AQEU
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	13	AQEU
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	11	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	14	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	77	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,804.0000	102	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	22	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	42	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	1	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	22	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	23	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	20	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	22	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	1	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	6	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	2	XCSE
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	2	XCSE

29

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	2	CEUX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	2	AQEU
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	1	AQEU
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	2	AQEU
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	27	CEUX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	9	AQEU
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	11	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	2	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	11	TQEX
Genmab A/S	17/06/2024	11:38:14 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:40:09 AM	1,802.5000	18	CEUX
Genmab A/S	17/06/2024	11:40:09 AM	1,802.5000	13	XCSE
Genmab A/S	17/06/2024	11:44:36 AM	1,804.0000	26	XCSE
Genmab A/S	17/06/2024	11:44:39 AM	1,804.0000	13	XCSE
Genmab A/S	17/06/2024	11:44:39 AM	1,804.0000	35	CEUX
Genmab A/S	17/06/2024	11:44:39 AM	1,804.0000	10	CEUX
Genmab A/S	17/06/2024	11:44:39 AM	1,804.0000	5	CEUX
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	13	XCSE
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	3	CEUX
Genmab A/S	17/06/2024	11:45:09 AM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	11:46:03 AM	1,804.0000	42	XCSE
Genmab A/S	17/06/2024	11:47:06 AM	1,804.0000	8	CEUX
Genmab A/S	17/06/2024	11:47:06 AM	1,804.0000	8	CEUX
Genmab A/S	17/06/2024	11:47:06 AM	1,804.0000	5	TQEX
Genmab A/S	17/06/2024	11:47:06 AM	1,804.0000	8	CEUX
Genmab A/S	17/06/2024	11:47:06 AM	1,804.0000	8	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	39	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	124	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	7	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	CEUX

30

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	3	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	5	AQEU
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	16	AQEU
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	2	AQEU
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	1	AQEU
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	18	AQEU
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	36	TQEX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	5	TQEX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	25	TQEX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	121	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	50	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	11	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	16	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	11:48:14 AM	1,803.0000	9	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	22	CEUX
Genmab A/S	17/06/2024	11:48:14 AM	1,803.5000	3	CEUX
Genmab A/S	17/06/2024	11:54:32 AM	1,803.0000	10	CEUX
Genmab A/S	17/06/2024	11:54:32 AM	1,803.0000	6	CEUX
Genmab A/S	17/06/2024	11:54:32 AM	1,803.0000	10	AQEU
Genmab A/S	17/06/2024	11:54:32 AM	1,803.0000	10	TQEX
Genmab A/S	17/06/2024	11:54:55 AM	1,803.0000	1	CEUX
Genmab A/S	17/06/2024	11:54:55 AM	1,803.0000	4	CEUX
Genmab A/S	17/06/2024	11:54:55 AM	1,803.0000	27	CEUX
Genmab A/S	17/06/2024	11:54:55 AM	1,803.0000	6	CEUX
Genmab A/S	17/06/2024	11:55:25 AM	1,803.0000	2	CEUX
Genmab A/S	17/06/2024	11:55:25 AM	1,803.0000	33	CEUX
Genmab A/S	17/06/2024	11:55:25 AM	1,803.0000	3	CEUX
Genmab A/S	17/06/2024	11:55:45 AM	1,803.0000	9	CEUX
Genmab A/S	17/06/2024	11:55:45 AM	1,803.0000	6	CEUX
Genmab A/S	17/06/2024	11:55:45 AM	1,803.0000	14	AQEU
Genmab A/S	17/06/2024	11:57:53 AM	1,805.5000	47	XCSE
Genmab A/S	17/06/2024	11:57:53 AM	1,805.5000	38	XCSE
Genmab A/S	17/06/2024	11:57:53 AM	1,805.5000	9	XCSE
Genmab A/S	17/06/2024	11:57:53 AM	1,805.5000	38	XCSE
Genmab A/S	17/06/2024	11:57:53 AM	1,805.5000	47	XCSE
Genmab A/S	17/06/2024	11:57:53 AM	1,805.5000	43	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	48	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	2	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	50	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	49	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	48	XCSE

31

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	2	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	50	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	11	TQEX
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	3	TQEX
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	91	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,805.0000	13	AQEU
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	21	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	19	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	21	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	19	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	21	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	19	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	1	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	6	CEUX
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	2	AQEU
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	2	AQEU
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	2	AQEU
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	21	XCSE
Genmab A/S	17/06/2024	11:57:56 AM	1,804.5000	20	XCSE
Genmab A/S	17/06/2024	12:02:54 PM	1,803.0000	16	CEUX
Genmab A/S	17/06/2024	12:03:55 PM	1,804.0000	28	XCSE
Genmab A/S	17/06/2024	12:03:55 PM	1,804.0000	7	XCSE
Genmab A/S	17/06/2024	12:03:55 PM	1,804.0000	1	XCSE
Genmab A/S	17/06/2024	12:04:16 PM	1,804.0000	5	CEUX
Genmab A/S	17/06/2024	12:04:16 PM	1,804.0000	27	CEUX
Genmab A/S	17/06/2024	12:04:16 PM	1,804.0000	2	TQEX
Genmab A/S	17/06/2024	12:04:16 PM	1,804.0000	2	XCSE
Genmab A/S	17/06/2024	12:04:36 PM	1,804.0000	14	CEUX
Genmab A/S	17/06/2024	12:04:36 PM	1,804.0000	14	CEUX
Genmab A/S	17/06/2024	12:04:36 PM	1,804.0000	2	TQEX
Genmab A/S	17/06/2024	12:04:36 PM	1,804.0000	8	TQEX
Genmab A/S	17/06/2024	12:05:01 PM	1,804.0000	8	TQEX
Genmab A/S	17/06/2024	12:05:01 PM	1,804.0000	2	TQEX
Genmab A/S	17/06/2024	12:05:01 PM	1,804.0000	14	TQEX
Genmab A/S	17/06/2024	12:05:01 PM	1,804.0000	10	TQEX
Genmab A/S	17/06/2024	12:05:01 PM	1,804.0000	6	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	36	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	32	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	32	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	16	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	5	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	36	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	15	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	50	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	28	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,803.0000	29	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	21	CEUX

32

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	10	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	12	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	10	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	17	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	5	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	9	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	5	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	12	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	11	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	23	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	30	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	9	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	23	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	2	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	13	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	22	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	15	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	2	AQEU
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	52	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	14	TQEX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	3	CEUX
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	23	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	30	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.5000	36	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	16	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	7	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	18	XCSE
Genmab A/S	17/06/2024	12:05:02 PM	1,802.0000	5	XCSE
Genmab A/S	17/06/2024	12:06:19 PM	1,798.0000	18	XCSE
Genmab A/S	17/06/2024	12:06:19 PM	1,798.0000	12	XCSE
Genmab A/S	17/06/2024	12:06:19 PM	1,798.0000	18	XCSE
Genmab A/S	17/06/2024	12:06:19 PM	1,798.0000	18	CEUX
Genmab A/S	17/06/2024	12:06:19 PM	1,798.0000	5	TQEX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	20	CEUX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	6	CEUX

33

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	6	CEUX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	14	CEUX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	9	CEUX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	3	AQEU
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	5	TQEX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	1	TQEX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	5	TQEX
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	22	XCSE
Genmab A/S	17/06/2024	12:10:36 PM	1,796.5000	14	XCSE
Genmab A/S	17/06/2024	12:10:37 PM	1,796.5000	40	XCSE
Genmab A/S	17/06/2024	12:10:37 PM	1,796.5000	10	XCSE
Genmab A/S	17/06/2024	12:10:37 PM	1,796.5000	10	XCSE
Genmab A/S	17/06/2024	12:14:39 PM	1,796.0000	27	XCSE
Genmab A/S	17/06/2024	12:14:40 PM	1,796.0000	27	XCSE
Genmab A/S	17/06/2024	12:15:51 PM	1,795.5000	4	XCSE
Genmab A/S	17/06/2024	12:15:51 PM	1,795.5000	5	XCSE
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	8	CEUX
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	1	CEUX
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	8	CEUX
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	1	AQEU
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	1	AQEU
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	5	TQEX
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	1	TQEX
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	5	TQEX
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	7	XCSE
Genmab A/S	17/06/2024	12:16:33 PM	1,795.5000	5	XCSE
Genmab A/S	17/06/2024	12:17:09 PM	1,796.0000	108	XCSE
Genmab A/S	17/06/2024	12:17:11 PM	1,796.0000	58	XCSE
Genmab A/S	17/06/2024	12:17:13 PM	1,796.0000	41	XCSE
Genmab A/S	17/06/2024	12:17:13 PM	1,796.0000	27	XCSE
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	21	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	21	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	13	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	17	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	17	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	17	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	14	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	42	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	35	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	1	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	19	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	24	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	9	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	23	XCSE
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	38	XCSE

34

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	18	XCSE
Genmab A/S	17/06/2024	12:17:42 PM	1,794.5000	51	XCSE
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	20	XCSE
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	20	XCSE
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	19	XCSE
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	17	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	16	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	2	AQEU
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	7	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	2	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	3	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	2	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	7	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,794.0000	5	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	23	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	15	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	6	CEUX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	3	TQEX
Genmab A/S	17/06/2024	12:17:42 PM	1,793.5000	16	XCSE
Genmab A/S	17/06/2024	12:24:03 PM	1,790.5000	1	XCSE
Genmab A/S	17/06/2024	12:24:03 PM	1,790.5000	89	CEUX
Genmab A/S	17/06/2024	12:24:03 PM	1,790.5000	14	TQEX
Genmab A/S	17/06/2024	12:25:59 PM	1,791.0000	14	XCSE
Genmab A/S	17/06/2024	12:26:00 PM	1,791.0000	81	CEUX
Genmab A/S	17/06/2024	12:26:00 PM	1,791.0000	58	XCSE
Genmab A/S	17/06/2024	12:26:03 PM	1,791.0000	12	AQEU
Genmab A/S	17/06/2024	12:26:03 PM	1,791.0000	12	TQEX
Genmab A/S	17/06/2024	12:26:03 PM	1,791.0000	14	XCSE
Genmab A/S	17/06/2024	12:26:03 PM	1,791.0000	3	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	24	XCSE

35

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	38	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	3	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	3	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	7	CEUX
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	2	AQEU
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	9	AQEU
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	2	AQEU
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	2	AQEU
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	2	AQEU
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	2	AQEU
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	24	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	19	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	5	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	11	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	16	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	24	XCSE
Genmab A/S	17/06/2024	12:29:29 PM	1,794.0000	1	XCSE
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	2	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	5	TQEX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	5	TQEX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	5	TQEX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	XCSE
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	8	XCSE
Genmab A/S	17/06/2024	12:32:08 PM	1,793.0000	18	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.0000	5	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.0000	18	CEUX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.0000	2	AQEU
Genmab A/S	17/06/2024	12:32:08 PM	1,793.0000	5	TQEX
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	22	XCSE
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	22	XCSE
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	22	XCSE
Genmab A/S	17/06/2024	12:32:08 PM	1,793.5000	22	XCSE
Genmab A/S	17/06/2024	12:32:08 PM	1,793.0000	5	TQEX
Genmab A/S	17/06/2024	12:32:09 PM	1,793.5000	22	XCSE

36

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	12:32:09 PM	1,793.5000	4	XCSE
Genmab A/S	17/06/2024	12:34:06 PM	1,790.5000	8	CEUX
Genmab A/S	17/06/2024	12:34:06 PM	1,790.5000	5	TQEX
Genmab A/S	17/06/2024	12:34:06 PM	1,790.5000	7	XCSE
Genmab A/S	17/06/2024	12:34:06 PM	1,790.5000	8	CEUX
Genmab A/S	17/06/2024	12:34:06 PM	1,790.5000	5	TQEX
Genmab A/S	17/06/2024	12:34:06 PM	1,790.5000	1	XCSE
Genmab A/S	17/06/2024	12:35:47 PM	1,791.5000	9	CEUX
Genmab A/S	17/06/2024	12:35:47 PM	1,791.5000	12	CEUX
Genmab A/S	17/06/2024	12:35:47 PM	1,791.5000	4	CEUX
Genmab A/S	17/06/2024	12:35:47 PM	1,791.5000	12	XCSE
Genmab A/S	17/06/2024	12:35:54 PM	1,791.5000	32	XCSE
Genmab A/S	17/06/2024	12:36:06 PM	1,791.5000	33	CEUX
Genmab A/S	17/06/2024	12:36:06 PM	1,791.5000	7	CEUX
Genmab A/S	17/06/2024	12:36:46 PM	1,791.5000	35	CEUX
Genmab A/S	17/06/2024	12:36:46 PM	1,791.5000	93	CEUX
Genmab A/S	17/06/2024	12:36:46 PM	1,791.5000	50	XCSE
Genmab A/S	17/06/2024	12:36:46 PM	1,791.5000	36	CEUX
Genmab A/S	17/06/2024	12:36:46 PM	1,791.5000	9	AQEU
Genmab A/S	17/06/2024	12:36:46 PM	1,791.5000	15	TQEX
Genmab A/S	17/06/2024	12:36:46 PM	1,791.5000	9	TQEX
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	76	XCSE
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	58	XCSE
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	104	XCSE
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	14	XCSE
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	5	CEUX
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	47	CEUX
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	16	CEUX
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	50	CEUX
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	2	CEUX
Genmab A/S	17/06/2024	12:39:53 PM	1,793.5000	39	CEUX
Genmab A/S	17/06/2024	12:39:53 PM	1,792.0000	4	CEUX
Genmab A/S	17/06/2024	12:39:53 PM	1,792.0000	5	TQEX
Genmab A/S	17/06/2024	12:43:06 PM	1,790.5000	21	XCSE
Genmab A/S	17/06/2024	12:43:06 PM	1,790.5000	1	XCSE
Genmab A/S	17/06/2024	12:44:42 PM	1,793.0000	36	XCSE
Genmab A/S	17/06/2024	12:45:09 PM	1,793.0000	9	AQEU
Genmab A/S	17/06/2024	12:45:09 PM	1,793.0000	9	TQEX
Genmab A/S	17/06/2024	12:45:09 PM	1,793.0000	18	XCSE
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	9	XCSE
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	10	CEUX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	3	CEUX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	1	AQEU
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	5	AQEU
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	1	AQEU
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	33	AQEU
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	5	TQEX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	5	TQEX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	11	TQEX

37

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	7	CEUX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	5	TQEX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	7	CEUX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	5	TQEX
Genmab A/S	17/06/2024	12:45:27 PM	1,792.0000	3	CEUX
Genmab A/S	17/06/2024	12:45:28 PM	1,792.0000	10	CEUX
Genmab A/S	17/06/2024	12:45:41 PM	1,792.0000	10	CEUX
Genmab A/S	17/06/2024	12:45:41 PM	1,792.0000	5	TQEX
Genmab A/S	17/06/2024	12:45:48 PM	1,792.0000	9	CEUX
Genmab A/S	17/06/2024	12:45:48 PM	1,792.0000	1	CEUX
Genmab A/S	17/06/2024	12:45:48 PM	1,792.0000	5	TQEX
Genmab A/S	17/06/2024	12:46:06 PM	1,792.0000	9	XCSE
Genmab A/S	17/06/2024	12:47:32 PM	1,793.0000	10	CEUX
Genmab A/S	17/06/2024	12:47:32 PM	1,793.0000	5	TQEX
Genmab A/S	17/06/2024	12:47:32 PM	1,793.0000	10	CEUX
Genmab A/S	17/06/2024	12:47:32 PM	1,793.0000	8	XCSE
Genmab A/S	17/06/2024	12:47:33 PM	1,793.0000	2	XCSE
Genmab A/S	17/06/2024	12:47:33 PM	1,793.0000	8	XCSE
Genmab A/S	17/06/2024	12:48:04 PM	1,793.0000	1	CEUX
Genmab A/S	17/06/2024	12:48:04 PM	1,793.0000	36	CEUX
Genmab A/S	17/06/2024	12:48:12 PM	1,793.0000	36	CEUX
Genmab A/S	17/06/2024	12:48:59 PM	1,793.0000	5	TQEX
Genmab A/S	17/06/2024	12:49:03 PM	1,793.0000	32	TQEX
Genmab A/S	17/06/2024	12:49:06 PM	1,793.0000	35	TQEX
Genmab A/S	17/06/2024	12:49:06 PM	1,793.0000	1	TQEX
Genmab A/S	17/06/2024	12:50:22 PM	1,793.5000	23	CEUX
Genmab A/S	17/06/2024	12:50:22 PM	1,793.5000	22	CEUX
Genmab A/S	17/06/2024	12:50:22 PM	1,793.5000	1	CEUX
Genmab A/S	17/06/2024	12:50:22 PM	1,793.5000	24	XCSE
Genmab A/S	17/06/2024	12:50:22 PM	1,793.5000	24	XCSE
Genmab A/S	17/06/2024	12:50:22 PM	1,793.5000	10	XCSE
Genmab A/S	17/06/2024	12:50:22 PM	1,793.5000	7	XCSE
Genmab A/S	17/06/2024	12:51:14 PM	1,794.0000	7	CEUX
Genmab A/S	17/06/2024	12:51:14 PM	1,794.0000	1	CEUX
Genmab A/S	17/06/2024	12:51:14 PM	1,794.0000	7	AQEU
Genmab A/S	17/06/2024	12:51:28 PM	1,794.5000	10	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	70	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	2	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	9	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	CEUX
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	10	CEUX

38

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	12:51:38 PM	1,794.5000	19	CEUX
Genmab A/S	17/06/2024	12:51:40 PM	1,794.0000	11	CEUX
Genmab A/S	17/06/2024	12:51:40 PM	1,794.0000	2	AQEU
Genmab A/S	17/06/2024	12:51:40 PM	1,794.0000	12	XCSE
Genmab A/S	17/06/2024	12:51:40 PM	1,794.0000	12	XCSE
Genmab A/S	17/06/2024	12:51:40 PM	1,794.0000	4	XCSE
Genmab A/S	17/06/2024	12:51:40 PM	1,794.0000	4	XCSE
Genmab A/S	17/06/2024	12:51:40 PM	1,794.0000	11	CEUX
Genmab A/S	17/06/2024	12:52:39 PM	1,793.0000	25	XCSE
Genmab A/S	17/06/2024	12:54:11 PM	1,794.5000	12	XCSE
Genmab A/S	17/06/2024	12:54:11 PM	1,794.5000	23	XCSE
Genmab A/S	17/06/2024	12:54:40 PM	1,794.5000	1	XCSE
Genmab A/S	17/06/2024	12:54:40 PM	1,794.5000	12	XCSE
Genmab A/S	17/06/2024	12:54:40 PM	1,794.5000	23	XCSE
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	50	CEUX
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	50	CEUX
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	55	XCSE
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	16	CEUX
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	20	CEUX
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	4	AQEU
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	20	XCSE
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	15	XCSE
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	20	XCSE
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	15	XCSE
Genmab A/S	17/06/2024	12:54:45 PM	1,793.5000	14	CEUX
Genmab A/S	17/06/2024	12:54:46 PM	1,793.5000	14	CEUX
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	3	CEUX
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	8	CEUX
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	8	CEUX
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	36	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	2	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	22	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	22	XCSE
Genmab A/S	17/06/2024	12:56:32 PM	1,794.5000	21	XCSE
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	36	XCSE
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	33	CEUX
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	31	CEUX
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	5	TQEX
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	13	TQEX
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	5	TQEX
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	32	XCSE
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	18	XCSE
Genmab A/S	17/06/2024	1:00:15 PM	1,799.0000	23	XCSE
Genmab A/S	17/06/2024	1:01:36 PM	1,798.0000	4	CEUX

39

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	1:01:36 PM	1,798.0000	77	CEUX
Genmab A/S	17/06/2024	1:01:36 PM	1,798.0000	12	AQEU
Genmab A/S	17/06/2024	1:01:36 PM	1,798.0000	12	TQEX
Genmab A/S	17/06/2024	1:01:36 PM	1,798.0000	5	XCSE
Genmab A/S	17/06/2024	1:01:36 PM	1,798.0000	50	XCSE
Genmab A/S	17/06/2024	1:01:36 PM	1,798.0000	34	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	3	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	2	AQEU
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	1	AQEU
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	2	AQEU
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	2	AQEU
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	21	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	3	AQEU
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	11	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	8	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	15	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	23	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	23	XCSE
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	2	AQEU
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	21	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.0000	21	CEUX
Genmab A/S	17/06/2024	1:04:07 PM	1,799.5000	26	XCSE
Genmab A/S	17/06/2024	1:08:40 PM	1,798.0000	118	XCSE
Genmab A/S	17/06/2024	1:08:40 PM	1,798.0000	35	XCSE
Genmab A/S	17/06/2024	1:08:40 PM	1,798.0000	29	CEUX
Genmab A/S	17/06/2024	1:08:40 PM	1,798.0000	4	CEUX
Genmab A/S	17/06/2024	1:08:40 PM	1,798.0000	48	XCSE
Genmab A/S	17/06/2024	1:08:40 PM	1,798.0000	6	CEUX
Genmab A/S	17/06/2024	1:08:40 PM	1,798.0000	6	TQEX
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	35	XCSE
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	16	XCSE
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	45	CEUX
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	10	CEUX
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	36	CEUX
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	7	AQEU
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	1	AQEU
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	7	TQEX

40

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	1	TQEX
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	47	XCSE
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	36	CEUX
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	7	TQEX
Genmab A/S	17/06/2024	1:10:32 PM	1,799.5000	14	CEUX
Genmab A/S	17/06/2024	1:10:34 PM	1,799.5000	9	CEUX
Genmab A/S	17/06/2024	1:10:34 PM	1,799.5000	8	CEUX
Genmab A/S	17/06/2024	1:14:04 PM	1,798.5000	68	XCSE
Genmab A/S	17/06/2024	1:14:04 PM	1,798.5000	75	XCSE
Genmab A/S	17/06/2024	1:14:04 PM	1,798.5000	7	XCSE
Genmab A/S	17/06/2024	1:16:34 PM	1,801.0000	5	CEUX
Genmab A/S	17/06/2024	1:16:34 PM	1,801.0000	11	CEUX
Genmab A/S	17/06/2024	1:16:34 PM	1,801.0000	12	AQEU
Genmab A/S	17/06/2024	1:16:34 PM	1,801.0000	1	TQEX
Genmab A/S	17/06/2024	1:16:38 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	1:16:38 PM	1,801.0000	7	XCSE
Genmab A/S	17/06/2024	1:16:45 PM	1,801.0000	20	CEUX
Genmab A/S	17/06/2024	1:16:45 PM	1,801.0000	8	CEUX
Genmab A/S	17/06/2024	1:16:45 PM	1,801.0000	10	CEUX
Genmab A/S	17/06/2024	1:17:12 PM	1,801.0000	8	CEUX
Genmab A/S	17/06/2024	1:17:12 PM	1,801.0000	30	CEUX
Genmab A/S	17/06/2024	1:17:36 PM	1,801.0000	9	CEUX
Genmab A/S	17/06/2024	1:17:36 PM	1,801.0000	28	CEUX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	46	XCSE
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	50	XCSE
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	41	CEUX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	41	CEUX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	4	CEUX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	6	AQEU
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	7	TQEX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	7	TQEX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	6	AQEU
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	7	TQEX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	7	TQEX
Genmab A/S	17/06/2024	1:17:53 PM	1,801.0000	50	CEUX
Genmab A/S	17/06/2024	1:17:53 PM	1,800.0000	5	CEUX
Genmab A/S	17/06/2024	1:19:30 PM	1,799.0000	15	CEUX
Genmab A/S	17/06/2024	1:20:06 PM	1,799.0000	5	TQEX
Genmab A/S	17/06/2024	1:20:06 PM	1,799.0000	14	CEUX
Genmab A/S	17/06/2024	1:20:57 PM	1,799.0000	100	CEUX
Genmab A/S	17/06/2024	1:20:57 PM	1,799.0000	7	AQEU
Genmab A/S	17/06/2024	1:20:57 PM	1,799.0000	7	AQEU
Genmab A/S	17/06/2024	1:20:57 PM	1,799.0000	16	TQEX
Genmab A/S	17/06/2024	1:20:57 PM	1,799.0000	112	XCSE
Genmab A/S	17/06/2024	1:20:57 PM	1,798.0000	25	XCSE
Genmab A/S	17/06/2024	1:20:57 PM	1,798.0000	39	XCSE
Genmab A/S	17/06/2024	1:20:58 PM	1,798.0000	22	CEUX
Genmab A/S	17/06/2024	1:20:58 PM	1,798.0000	14	CEUX
Genmab A/S	17/06/2024	1:21:15 PM	1,797.0000	50	XCSE

41

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	1:21:15 PM	1,797.0000	34	XCSE
Genmab A/S	17/06/2024	1:21:15 PM	1,797.0000	16	XCSE
Genmab A/S	17/06/2024	1:21:15 PM	1,797.0000	22	XCSE
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	9	XCSE
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	39	XCSE
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	10	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	10	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	10	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	10	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	10	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	10	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	1	AQEU
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	2	AQEU
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	5	TQEX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	36	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	9	XCSE
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	9	XCSE
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	17	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	8	CEUX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	15	TQEX
Genmab A/S	17/06/2024	1:25:41 PM	1,796.5000	6	CEUX
Genmab A/S	17/06/2024	1:26:35 PM	1,797.5000	17	XCSE
Genmab A/S	17/06/2024	1:26:35 PM	1,797.5000	25	XCSE
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	11	XCSE
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	135	XCSE
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	2	CEUX
Genmab A/S	17/06/2024	1:27:48 PM	1,798.0000	2	AQEU
Genmab A/S	17/06/2024	1:30:43 PM	1,798.5000	5	TQEX
Genmab A/S	17/06/2024	1:32:04 PM	1,799.0000	4	CEUX
Genmab A/S	17/06/2024	1:32:04 PM	1,799.0000	35	CEUX
Genmab A/S	17/06/2024	1:32:27 PM	1,799.0000	12	AQEU
Genmab A/S	17/06/2024	1:32:38 PM	1,799.0000	22	CEUX
Genmab A/S	17/06/2024	1:32:49 PM	1,799.0000	34	CEUX
Genmab A/S	17/06/2024	1:33:05 PM	1,798.5000	14	CEUX
Genmab A/S	17/06/2024	1:33:05 PM	1,798.5000	5	TQEX
Genmab A/S	17/06/2024	1:33:05 PM	1,798.5000	3	CEUX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	11	CEUX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	10	CEUX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	10	CEUX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	2	AQEU
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	3	AQEU

42

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	5	TQEX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	4	TQEX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	4	CEUX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	10	CEUX
Genmab A/S	17/06/2024	1:33:06 PM	1,798.5000	7	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	17	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	26	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	42	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	17	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	26	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	9	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	17	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	26	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	9	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	52	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	17	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	2	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	16	XCSE
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	15	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	12	CEUX
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	3	AQEU
Genmab A/S	17/06/2024	1:34:54 PM	1,798.5000	2	AQEU
Genmab A/S	17/06/2024	1:34:55 PM	1,797.0000	1	CEUX
Genmab A/S	17/06/2024	1:37:33 PM	1,798.0000	80	CEUX
Genmab A/S	17/06/2024	1:40:21 PM	1,799.0000	11	CEUX
Genmab A/S	17/06/2024	1:40:21 PM	1,799.0000	7	CEUX

43

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	1:40:21 PM	1,799.0000	18	CEUX
Genmab A/S	17/06/2024	1:40:41 PM	1,799.0000	19	CEUX
Genmab A/S	17/06/2024	1:40:41 PM	1,799.0000	5	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,799.0000	10	TQEX
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	7	CEUX
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	28	CEUX
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	25	CEUX
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	5	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	2	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	5	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	2	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	5	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	2	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	5	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	2	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	2	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	3	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	2	AQEU
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	9	XCSE
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	29	XCSE
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	38	XCSE
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	50	XCSE
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	10	CEUX
Genmab A/S	17/06/2024	1:40:41 PM	1,798.0000	38	XCSE
Genmab A/S	17/06/2024	1:42:09 PM	1,798.0000	51	XCSE
Genmab A/S	17/06/2024	1:42:09 PM	1,798.0000	23	XCSE
Genmab A/S	17/06/2024	1:42:09 PM	1,798.0000	39	XCSE
Genmab A/S	17/06/2024	1:42:09 PM	1,798.0000	64	XCSE
Genmab A/S	17/06/2024	1:42:18 PM	1,797.5000	19	CEUX
Genmab A/S	17/06/2024	1:42:18 PM	1,797.5000	2	CEUX
Genmab A/S	17/06/2024	1:47:49 PM	1,800.5000	3	CEUX
Genmab A/S	17/06/2024	1:47:59 PM	1,801.5000	21	CEUX
Genmab A/S	17/06/2024	1:48:08 PM	1,801.5000	21	CEUX
Genmab A/S	17/06/2024	1:48:08 PM	1,801.5000	23	XCSE
Genmab A/S	17/06/2024	1:48:08 PM	1,801.5000	21	CEUX
Genmab A/S	17/06/2024	1:48:08 PM	1,801.5000	20	CEUX
Genmab A/S	17/06/2024	1:48:08 PM	1,801.5000	20	CEUX
Genmab A/S	17/06/2024	1:49:13 PM	1,802.5000	24	XCSE
Genmab A/S	17/06/2024	1:49:13 PM	1,802.5000	73	XCSE
Genmab A/S	17/06/2024	1:49:13 PM	1,802.0000	12	XCSE
Genmab A/S	17/06/2024	1:49:13 PM	1,802.0000	35	XCSE
Genmab A/S	17/06/2024	1:49:13 PM	1,802.5000	47	CEUX
Genmab A/S	17/06/2024	1:49:13 PM	1,802.5000	41	CEUX
Genmab A/S	17/06/2024	1:49:20 PM	1,803.0000	24	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	28	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	52	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	57	XCSE
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	57	XCSE
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	57	XCSE

44

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	23	XCSE
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	34	XCSE
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	34	XCSE
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	23	XCSE
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	4	XCSE
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	28	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	24	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	4	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	6	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	1	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	41	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	1	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	35	CEUX
Genmab A/S	17/06/2024	1:49:21 PM	1,803.0000	15	CEUX
Genmab A/S	17/06/2024	1:49:27 PM	1,800.0000	48	XCSE
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	11	XCSE
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	21	XCSE
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	45	XCSE
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	10	CEUX
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	2	AQEU
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	2	AQEU
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	11	XCSE
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	21	XCSE
Genmab A/S	17/06/2024	1:55:46 PM	1,801.0000	10	CEUX
Genmab A/S	17/06/2024	1:56:57 PM	1,800.5000	35	CEUX
Genmab A/S	17/06/2024	1:56:57 PM	1,800.5000	12	XCSE
Genmab A/S	17/06/2024	1:56:57 PM	1,800.5000	32	XCSE
Genmab A/S	17/06/2024	1:56:57 PM	1,800.5000	29	XCSE
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	24	XCSE
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	53	XCSE
Genmab A/S	17/06/2024	1:57:20 PM	1,800.0000	78	XCSE
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	15	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	4	AQEU
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	11	AQEU
Genmab A/S	17/06/2024	1:57:20 PM	1,800.0000	51	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,800.0000	70	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,800.0000	17	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,800.0000	7	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,800.0000	10	AQEU
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	7	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	22	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	4	AQEU
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	4	AQEU
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	9	XCSE
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	22	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	4	AQEU
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	21	CEUX
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	9	XCSE
Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	9	AQEU

45

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	1:57:20 PM	1,799.5000	8	CEUX
Genmab A/S	17/06/2024	1:57:21 PM	1,799.0000	38	XCSE
Genmab A/S	17/06/2024	1:57:25 PM	1,799.0000	13	XCSE
Genmab A/S	17/06/2024	1:57:25 PM	1,799.0000	29	XCSE
Genmab A/S	17/06/2024	1:57:25 PM	1,799.0000	39	XCSE
Genmab A/S	17/06/2024	2:03:29 PM	1,799.0000	12	CEUX
Genmab A/S	17/06/2024	2:03:29 PM	1,799.0000	12	CEUX
Genmab A/S	17/06/2024	2:03:33 PM	1,799.0000	12	CEUX
Genmab A/S	17/06/2024	2:03:33 PM	1,799.0000	6	CEUX
Genmab A/S	17/06/2024	2:03:33 PM	1,799.0000	2	AQEU
Genmab A/S	17/06/2024	2:03:33 PM	1,799.0000	1	AQEU
Genmab A/S	17/06/2024	2:03:33 PM	1,799.0000	13	XCSE
Genmab A/S	17/06/2024	2:03:33 PM	1,799.0000	7	XCSE
Genmab A/S	17/06/2024	2:05:12 PM	1,799.0000	36	CEUX
Genmab A/S	17/06/2024	2:05:30 PM	1,799.0000	6	CEUX
Genmab A/S	17/06/2024	2:05:30 PM	1,799.0000	27	CEUX
Genmab A/S	17/06/2024	2:05:30 PM	1,799.0000	5	XCSE
Genmab A/S	17/06/2024	2:05:42 PM	1,798.0000	89	CEUX
Genmab A/S	17/06/2024	2:05:42 PM	1,798.0000	26	XCSE
Genmab A/S	17/06/2024	2:05:42 PM	1,798.0000	27	XCSE
Genmab A/S	17/06/2024	2:05:42 PM	1,798.0000	17	XCSE
Genmab A/S	17/06/2024	2:05:50 PM	1,798.0000	53	XCSE
Genmab A/S	17/06/2024	2:05:50 PM	1,798.0000	15	XCSE
Genmab A/S	17/06/2024	2:05:50 PM	1,797.5000	21	CEUX
Genmab A/S	17/06/2024	2:05:50 PM	1,797.5000	3	CEUX
Genmab A/S	17/06/2024	2:07:35 PM	1,800.0000	21	XCSE
Genmab A/S	17/06/2024	2:07:35 PM	1,800.0000	62	XCSE
Genmab A/S	17/06/2024	2:07:35 PM	1,800.5000	26	CEUX
Genmab A/S	17/06/2024	2:07:35 PM	1,800.5000	26	CEUX
Genmab A/S	17/06/2024	2:07:35 PM	1,800.5000	1	CEUX
Genmab A/S	17/06/2024	2:09:00 PM	1,800.0000	57	XCSE
Genmab A/S	17/06/2024	2:09:00 PM	1,800.0000	97	XCSE
Genmab A/S	17/06/2024	2:09:35 PM	1,802.5000	21	XCSE
Genmab A/S	17/06/2024	2:09:44 PM	1,802.0000	44	XCSE
Genmab A/S	17/06/2024	2:09:44 PM	1,802.0000	51	XCSE
Genmab A/S	17/06/2024	2:09:44 PM	1,802.5000	4	XCSE
Genmab A/S	17/06/2024	2:09:44 PM	1,802.5000	40	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	4	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	6	CEUX

46

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	11	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,804.0000	2	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	4	AQEU
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	21	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	13	CEUX
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	24	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	11	XCSE
Genmab A/S	17/06/2024	2:11:21 PM	1,803.5000	36	AQEU
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	9	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	3	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	20	CEUX
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	20	CEUX

47

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	20	CEUX
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	20	CEUX
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	3	AQEU
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	4	CEUX
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	3	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	6	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	3	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	21	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	42	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	2	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	27	XCSE
Genmab A/S	17/06/2024	2:11:22 PM	1,802.5000	11	XCSE
Genmab A/S	17/06/2024	2:20:28 PM	1,802.5000	9	CEUX
Genmab A/S	17/06/2024	2:20:28 PM	1,802.5000	21	CEUX
Genmab A/S	17/06/2024	2:20:28 PM	1,802.5000	7	XCSE
Genmab A/S	17/06/2024	2:20:50 PM	1,802.5000	35	XCSE
Genmab A/S	17/06/2024	2:21:14 PM	1,802.5000	35	XCSE
Genmab A/S	17/06/2024	2:21:31 PM	1,802.5000	36	CEUX
Genmab A/S	17/06/2024	2:21:31 PM	1,802.5000	3	TQEX
Genmab A/S	17/06/2024	2:21:56 PM	1,802.5000	39	TQEX
Genmab A/S	17/06/2024	2:22:18 PM	1,802.5000	36	CEUX
Genmab A/S	17/06/2024	2:22:38 PM	1,802.5000	36	CEUX
Genmab A/S	17/06/2024	2:22:38 PM	1,802.5000	3	TQEX
Genmab A/S	17/06/2024	2:23:02 PM	1,802.5000	36	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	20	TQEX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	14	TQEX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	20	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	5	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	100	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	2	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	77	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	25	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	40	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	13	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	50	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	39	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	11	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	4	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	2	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	2	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	3	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	20	CEUX
Genmab A/S	17/06/2024	2:23:31 PM	1,802.5000	27	CEUX
Genmab A/S	17/06/2024	2:28:54 PM	1,805.0000	10	XCSE
Genmab A/S	17/06/2024	2:28:54 PM	1,805.0000	10	XCSE
Genmab A/S	17/06/2024	2:29:57 PM	1,805.0000	1	XCSE

48

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	2:30:05 PM	1,805.0000	26	CEUX
Genmab A/S	17/06/2024	2:30:05 PM	1,805.0000	26	CEUX
Genmab A/S	17/06/2024	2:30:05 PM	1,805.0000	27	XCSE
Genmab A/S	17/06/2024	2:30:05 PM	1,805.0000	27	XCSE
Genmab A/S	17/06/2024	2:30:05 PM	1,805.0000	27	XCSE
Genmab A/S	17/06/2024	2:30:05 PM	1,805.0000	27	XCSE
Genmab A/S	17/06/2024	2:30:06 PM	1,805.0000	26	CEUX
Genmab A/S	17/06/2024	2:30:06 PM	1,805.0000	19	CEUX
Genmab A/S	17/06/2024	2:30:25 PM	1,805.0000	8	XCSE
Genmab A/S	17/06/2024	2:30:25 PM	1,805.0000	11	CEUX
Genmab A/S	17/06/2024	2:31:31 PM	1,805.5000	52	CEUX
Genmab A/S	17/06/2024	2:31:31 PM	1,805.5000	52	CEUX
Genmab A/S	17/06/2024	2:31:31 PM	1,805.5000	52	CEUX
Genmab A/S	17/06/2024	2:31:31 PM	1,805.5000	4	CEUX
Genmab A/S	17/06/2024	2:31:47 PM	1,805.5000	14	CEUX
Genmab A/S	17/06/2024	2:31:47 PM	1,805.5000	23	CEUX
Genmab A/S	17/06/2024	2:31:47 PM	1,804.5000	40	CEUX
Genmab A/S	17/06/2024	2:31:47 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	2:31:47 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	2:31:47 PM	1,804.5000	6	XCSE
Genmab A/S	17/06/2024	2:31:47 PM	1,804.5000	27	CEUX
Genmab A/S	17/06/2024	2:31:47 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	2:31:47 PM	1,804.5000	13	CEUX
Genmab A/S	17/06/2024	2:32:52 PM	1,806.5000	11	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	3	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	8	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	6	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	3	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	5	XCSE
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	2	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	6	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	2	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	11	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	36	CEUX
Genmab A/S	17/06/2024	2:32:58 PM	1,806.5000	8	CEUX
Genmab A/S	17/06/2024	2:35:15 PM	1,806.0000	12	CEUX
Genmab A/S	17/06/2024	2:35:15 PM	1,806.0000	14	CEUX

49

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	2:35:15 PM	1,806.0000	12	XCSE
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	10	CEUX
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	9	CEUX
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	3	XCSE
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	7	XCSE
Genmab A/S	17/06/2024	2:35:22 PM	1,805.5000	10	XCSE
Genmab A/S	17/06/2024	2:35:51 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:35:51 PM	1,806.0000	33	XCSE
Genmab A/S	17/06/2024	2:36:14 PM	1,806.0000	34	CEUX
Genmab A/S	17/06/2024	2:36:14 PM	1,806.0000	12	CEUX
Genmab A/S	17/06/2024	2:36:16 PM	1,806.0000	10	CEUX
Genmab A/S	17/06/2024	2:36:26 PM	1,806.0000	13	XCSE
Genmab A/S	17/06/2024	2:36:33 PM	1,806.0000	13	CEUX
Genmab A/S	17/06/2024	2:36:33 PM	1,806.0000	13	CEUX
Genmab A/S	17/06/2024	2:36:33 PM	1,806.0000	5	XCSE
Genmab A/S	17/06/2024	2:37:09 PM	1,805.5000	30	CEUX
Genmab A/S	17/06/2024	2:37:09 PM	1,806.0000	70	CEUX
Genmab A/S	17/06/2024	2:37:11 PM	1,805.5000	47	XCSE
Genmab A/S	17/06/2024	2:37:11 PM	1,805.5000	35	XCSE
Genmab A/S	17/06/2024	2:37:11 PM	1,805.5000	13	CEUX
Genmab A/S	17/06/2024	2:37:11 PM	1,805.5000	6	AQEU
Genmab A/S	17/06/2024	2:38:16 PM	1,806.0000	37	XCSE
Genmab A/S	17/06/2024	2:38:21 PM	1,805.0000	37	CEUX
Genmab A/S	17/06/2024	2:38:21 PM	1,805.0000	15	CEUX
Genmab A/S	17/06/2024	2:38:53 PM	1,805.5000	2	AQEU
Genmab A/S	17/06/2024	2:38:53 PM	1,805.5000	16	AQEU
Genmab A/S	17/06/2024	2:38:53 PM	1,805.5000	11	TQEX
Genmab A/S	17/06/2024	2:38:53 PM	1,805.5000	10	XCSE
Genmab A/S	17/06/2024	2:39:33 PM	1,805.5000	27	XCSE
Genmab A/S	17/06/2024	2:40:21 PM	1,806.5000	16	AQEU
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	54	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	53	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	19	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	18	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	36	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	19	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	26	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	8	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	54	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	27	XCSE

50

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	8	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	8	XCSE
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	32	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	17	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	48	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	35	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	24	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	25	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	40	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	8	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	16	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	33	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	16	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	8	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	24	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	49	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	48	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	49	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	27	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	48	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	49	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	6	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.5000	28	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.0000	7	CEUX
Genmab A/S	17/06/2024	2:43:25 PM	1,807.0000	3	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	37	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	54	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	39	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	13	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	53	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	54	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	53	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	2	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	18	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	22	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.5000	38	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	16	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	7	CEUX

51

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	5	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	19	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	5	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	1	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	12	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	6	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	19	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	2	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	9	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	19	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	19	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	1	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	3	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	1	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	18	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	19	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	3	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	19	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	3	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,806.5000	15	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	21	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	18	XCSE
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	5	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	18	CEUX
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	2	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,807.0000	9	AQEU
Genmab A/S	17/06/2024	2:43:26 PM	1,806.5000	14	XCSE
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	43	CEUX
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	12	CEUX
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	6	AQEU
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	6	AQEU
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	48	XCSE
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	12	XCSE
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	36	XCSE
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	12	XCSE
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	12	XCSE
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	57	XCSE
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	18	CEUX
Genmab A/S	17/06/2024	2:51:40 PM	1,804.0000	9	XCSE
Genmab A/S	17/06/2024	2:55:03 PM	1,803.5000	6	CEUX
Genmab A/S	17/06/2024	2:55:03 PM	1,803.5000	2	AQEU
Genmab A/S	17/06/2024	2:55:40 PM	1,804.5000	6	TQEX
Genmab A/S	17/06/2024	2:56:29 PM	1,803.5000	17	CEUX
Genmab A/S	17/06/2024	2:56:29 PM	1,803.5000	12	CEUX

52

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	2:56:34 PM	1,804.0000	25	XCSE
Genmab A/S	17/06/2024	2:57:00 PM	1,804.0000	5	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,804.0000	38	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,804.0000	7	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,804.0000	43	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,804.0000	40	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,804.0000	3	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,804.0000	4	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	12	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	12	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	12	XCSE
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	12	CEUX
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	15	CEUX
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	4	CEUX
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	4	CEUX
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	22	CEUX
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	12	CEUX
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	2:57:07 PM	1,803.5000	8	CEUX
Genmab A/S	17/06/2024	2:58:05 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:58:05 PM	1,804.0000	9	AQEU
Genmab A/S	17/06/2024	2:58:17 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:58:17 PM	1,804.0000	9	AQEU
Genmab A/S	17/06/2024	2:58:32 PM	1,804.0000	2	AQEU
Genmab A/S	17/06/2024	2:58:32 PM	1,804.0000	9	AQEU
Genmab A/S	17/06/2024	2:58:32 PM	1,803.0000	27	XCSE
Genmab A/S	17/06/2024	2:58:32 PM	1,803.0000	15	XCSE
Genmab A/S	17/06/2024	2:58:32 PM	1,803.0000	15	XCSE
Genmab A/S	17/06/2024	2:58:32 PM	1,803.0000	17	CEUX
Genmab A/S	17/06/2024	2:58:32 PM	1,803.0000	6	AQEU
Genmab A/S	17/06/2024	2:59:18 PM	1,804.5000	12	CEUX
Genmab A/S	17/06/2024	2:59:18 PM	1,804.5000	41	CEUX
Genmab A/S	17/06/2024	2:59:18 PM	1,804.5000	23	CEUX
Genmab A/S	17/06/2024	2:59:29 PM	1,804.0000	7	CEUX
Genmab A/S	17/06/2024	2:59:29 PM	1,804.0000	9	TQEX
Genmab A/S	17/06/2024	2:59:29 PM	1,804.0000	7	XCSE
Genmab A/S	17/06/2024	2:59:36 PM	1,804.0000	4	CEUX
Genmab A/S	17/06/2024	2:59:40 PM	1,804.0000	33	XCSE
Genmab A/S	17/06/2024	2:59:58 PM	1,804.0000	38	TQEX
Genmab A/S	17/06/2024	3:00:07 PM	1,803.5000	24	CEUX
Genmab A/S	17/06/2024	3:00:07 PM	1,803.5000	8	XCSE
Genmab A/S	17/06/2024	3:00:07 PM	1,803.5000	19	XCSE
Genmab A/S	17/06/2024	3:00:41 PM	1,804.0000	23	XCSE
Genmab A/S	17/06/2024	3:00:41 PM	1,804.0000	14	XCSE
Genmab A/S	17/06/2024	3:01:03 PM	1,804.0000	23	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	29	CEUX
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	29	CEUX
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	29	CEUX
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	2	CEUX

53

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	11	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	9	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	9	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	11	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	3	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	50	XCSE
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	14	XCSE
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	50	XCSE
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	14	XCSE
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	50	XCSE
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	8	XCSE
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	27	CEUX
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	2	CEUX
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	6	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	1	AQEU
Genmab A/S	17/06/2024	3:01:12 PM	1,804.0000	5	AQEU
Genmab A/S	17/06/2024	3:03:57 PM	1,807.0000	31	CEUX
Genmab A/S	17/06/2024	3:04:21 PM	1,808.0000	31	XCSE
Genmab A/S	17/06/2024	3:04:21 PM	1,808.0000	29	CEUX
Genmab A/S	17/06/2024	3:04:21 PM	1,808.0000	29	CEUX
Genmab A/S	17/06/2024	3:04:21 PM	1,808.0000	21	CEUX
Genmab A/S	17/06/2024	3:04:21 PM	1,808.0000	4	AQEU
Genmab A/S	17/06/2024	3:04:21 PM	1,808.0000	29	CEUX
Genmab A/S	17/06/2024	3:04:21 PM	1,808.0000	31	XCSE
Genmab A/S	17/06/2024	3:04:29 PM	1,808.5000	34	XCSE
Genmab A/S	17/06/2024	3:04:29 PM	1,808.5000	34	XCSE
Genmab A/S	17/06/2024	3:04:29 PM	1,808.5000	28	XCSE
Genmab A/S	17/06/2024	3:04:29 PM	1,808.5000	6	XCSE
Genmab A/S	17/06/2024	3:04:29 PM	1,808.5000	6	XCSE
Genmab A/S	17/06/2024	3:04:29 PM	1,808.5000	28	XCSE
Genmab A/S	17/06/2024	3:04:29 PM	1,808.5000	28	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	30	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	30	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	13	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	30	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	13	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	30	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	20	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	10	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	20	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	10	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	5	AQEU
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	5	AQEU
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	20	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	10	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	6	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	7	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	34	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	34	XCSE

54

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	34	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	34	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	21	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	13	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	16	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	20	CEUX
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	5	AQEU
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	23	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	8	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	18	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	30	XCSE
Genmab A/S	17/06/2024	3:04:30 PM	1,808.5000	20	XCSE
Genmab A/S	17/06/2024	3:10:31 PM	1,808.5000	20	CEUX
Genmab A/S	17/06/2024	3:11:23 PM	1,809.5000	23	XCSE
Genmab A/S	17/06/2024	3:11:32 PM	1,809.5000	12	XCSE
Genmab A/S	17/06/2024	3:11:32 PM	1,809.5000	22	XCSE
Genmab A/S	17/06/2024	3:11:50 PM	1,809.5000	10	XCSE
Genmab A/S	17/06/2024	3:11:50 PM	1,809.5000	31	XCSE
Genmab A/S	17/06/2024	3:12:32 PM	1,811.5000	50	XCSE
Genmab A/S	17/06/2024	3:12:32 PM	1,811.5000	18	XCSE
Genmab A/S	17/06/2024	3:12:47 PM	1,811.5000	34	XCSE
Genmab A/S	17/06/2024	3:12:49 PM	1,811.0000	136	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,811.5000	36	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	40	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	22	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	9	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	3	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	7	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	8	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	9	AQEU
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	2	AQEU
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	2	AQEU
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	2	AQEU
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	15	CEUX
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	13	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	50	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	6	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	10	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	75	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	2	AQEU
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	3	AQEU
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	5	AQEU

55

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	4	AQEU
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	37	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	72	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,811.0000	22	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	6	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	16	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	2	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	8	XCSE
Genmab A/S	17/06/2024	3:14:04 PM	1,810.5000	5	XCSE
Genmab A/S	17/06/2024	3:17:49 PM	1,807.5000	21	CEUX
Genmab A/S	17/06/2024	3:17:49 PM	1,807.5000	21	CEUX
Genmab A/S	17/06/2024	3:17:49 PM	1,807.5000	3	AQEU
Genmab A/S	17/06/2024	3:17:49 PM	1,807.5000	4	XCSE
Genmab A/S	17/06/2024	3:17:49 PM	1,807.5000	19	XCSE
Genmab A/S	17/06/2024	3:17:49 PM	1,807.5000	21	CEUX
Genmab A/S	17/06/2024	3:18:07 PM	1,807.5000	21	CEUX
Genmab A/S	17/06/2024	3:18:07 PM	1,807.5000	3	AQEU
Genmab A/S	17/06/2024	3:18:07 PM	1,807.5000	23	XCSE
Genmab A/S	17/06/2024	3:18:07 PM	1,807.5000	20	CEUX
Genmab A/S	17/06/2024	3:18:07 PM	1,807.5000	3	AQEU
Genmab A/S	17/06/2024	3:18:10 PM	1,807.0000	45	XCSE
Genmab A/S	17/06/2024	3:18:10 PM	1,807.0000	15	CEUX
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	43	CEUX
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	6	CEUX
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	37	CEUX
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	7	AQEU
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	49	XCSE
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	9	CEUX
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	7	AQEU
Genmab A/S	17/06/2024	3:19:55 PM	1,807.0000	11	XCSE
Genmab A/S	17/06/2024	3:20:35 PM	1,807.0000	30	XCSE
Genmab A/S	17/06/2024	3:20:35 PM	1,807.0000	96	XCSE
Genmab A/S	17/06/2024	3:20:35 PM	1,807.0000	16	AQEU
Genmab A/S	17/06/2024	3:20:35 PM	1,807.0000	16	AQEU
Genmab A/S	17/06/2024	3:20:35 PM	1,807.0000	12	AQEU
Genmab A/S	17/06/2024	3:20:35 PM	1,807.0000	50	XCSE
Genmab A/S	17/06/2024	3:20:35 PM	1,807.0000	14	AQEU
Genmab A/S	17/06/2024	3:21:33 PM	1,805.0000	25	AQEU
Genmab A/S	17/06/2024	3:21:33 PM	1,805.0000	3	AQEU
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	8	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	40	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	10	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	34	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	44	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	40	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,805.0000	152	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,805.0000	67	XCSE
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	6	AQEU

56

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:33 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	6	AQEU
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	3	AQEU
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	34	XCSE
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	10	XCSE
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	23	XCSE
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	10	XCSE
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	2	XCSE
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	9	XCSE
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	12	XCSE
Genmab A/S	17/06/2024	3:21:34 PM	1,804.5000	9	AQEU
Genmab A/S	17/06/2024	3:27:48 PM	1,806.0000	33	CEUX
Genmab A/S	17/06/2024	3:27:57 PM	1,806.0000	14	CEUX
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	50	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	31	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	31	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	31	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	31	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	31	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	19	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	12	XCSE
Genmab A/S	17/06/2024	3:27:57 PM	1,805.5000	50	XCSE
Genmab A/S	17/06/2024	3:27:58 PM	1,805.5000	31	XCSE
Genmab A/S	17/06/2024	3:27:58 PM	1,805.5000	40	XCSE
Genmab A/S	17/06/2024	3:27:58 PM	1,805.5000	22	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	16	AQEU
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	125	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	50	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	28	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	47	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	3	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	13	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	6	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	6	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	17	XCSE
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	16	AQEU
Genmab A/S	17/06/2024	3:28:01 PM	1,805.0000	12	AQEU
Genmab A/S	17/06/2024	3:30:20 PM	1,803.0000	10	XCSE
Genmab A/S	17/06/2024	3:30:20 PM	1,803.0000	6	AQEU
Genmab A/S	17/06/2024	3:30:20 PM	1,803.0000	24	XCSE
Genmab A/S	17/06/2024	3:30:20 PM	1,803.0000	12	XCSE
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	5	AQEU
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	5	AQEU
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	11	XCSE

57

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	21	XCSE
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	7	XCSE
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	19	XCSE
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	5	AQEU
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	1	AQEU
Genmab A/S	17/06/2024	3:30:42 PM	1,802.0000	4	AQEU
Genmab A/S	17/06/2024	3:30:43 PM	1,802.0000	5	AQEU
Genmab A/S	17/06/2024	3:30:43 PM	1,802.0000	5	AQEU
Genmab A/S	17/06/2024	3:30:43 PM	1,802.0000	8	XCSE
Genmab A/S	17/06/2024	3:30:44 PM	1,802.0000	13	XCSE
Genmab A/S	17/06/2024	3:30:44 PM	1,802.0000	39	XCSE
Genmab A/S	17/06/2024	3:33:21 PM	1,801.0000	68	XCSE
Genmab A/S	17/06/2024	3:33:21 PM	1,801.0000	51	XCSE
Genmab A/S	17/06/2024	3:33:48 PM	1,801.0000	9	AQEU
Genmab A/S	17/06/2024	3:33:48 PM	1,801.0000	9	AQEU
Genmab A/S	17/06/2024	3:33:48 PM	1,801.0000	1	XCSE
Genmab A/S	17/06/2024	3:33:48 PM	1,801.0000	67	XCSE
Genmab A/S	17/06/2024	3:33:48 PM	1,801.0000	2	XCSE
Genmab A/S	17/06/2024	3:33:48 PM	1,801.0000	66	XCSE
Genmab A/S	17/06/2024	3:34:43 PM	1,802.0000	5	AQEU
Genmab A/S	17/06/2024	3:34:43 PM	1,802.0000	11	XCSE
Genmab A/S	17/06/2024	3:34:53 PM	1,802.0000	5	AQEU
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	50	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	38	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	12	AQEU
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	16	AQEU
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	12	AQEU
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	15	AQEU
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	61	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	27	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	34	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	88	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	23	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	27	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	27	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	46	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,803.0000	22	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	47	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	47	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	47	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	47	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	9	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	38	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	20	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	27	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	13	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	20	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	14	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	47	XCSE

58

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:35:11 PM	1,802.5000	9	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	46	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	46	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	46	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	11	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	5	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	30	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	4	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	18	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	18	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	6	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	12	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	12	XCSE
Genmab A/S	17/06/2024	3:35:11 PM	1,802.0000	34	XCSE
Genmab A/S	17/06/2024	3:37:38 PM	1,796.5000	45	XCSE
Genmab A/S	17/06/2024	3:37:39 PM	1,796.5000	20	XCSE
Genmab A/S	17/06/2024	3:37:39 PM	1,796.5000	25	XCSE
Genmab A/S	17/06/2024	3:37:39 PM	1,796.5000	16	XCSE
Genmab A/S	17/06/2024	3:37:39 PM	1,796.5000	6	AQEU
Genmab A/S	17/06/2024	3:37:39 PM	1,796.5000	6	AQEU
Genmab A/S	17/06/2024	3:37:39 PM	1,796.5000	19	XCSE
Genmab A/S	17/06/2024	3:37:39 PM	1,796.0000	11	CEUX
Genmab A/S	17/06/2024	3:37:39 PM	1,796.5000	6	AQEU
Genmab A/S	17/06/2024	3:37:40 PM	1,796.5000	26	XCSE
Genmab A/S	17/06/2024	3:37:40 PM	1,796.5000	41	XCSE
Genmab A/S	17/06/2024	3:37:40 PM	1,796.5000	4	XCSE
Genmab A/S	17/06/2024	3:37:40 PM	1,796.5000	41	XCSE
Genmab A/S	17/06/2024	3:37:40 PM	1,796.5000	45	XCSE
Genmab A/S	17/06/2024	3:37:40 PM	1,796.5000	31	XCSE
Genmab A/S	17/06/2024	3:40:49 PM	1,795.0000	78	AQEU
Genmab A/S	17/06/2024	3:41:33 PM	1,794.5000	3	XCSE
Genmab A/S	17/06/2024	3:42:32 PM	1,795.0000	11	AQEU
Genmab A/S	17/06/2024	3:42:32 PM	1,795.0000	15	XCSE
Genmab A/S	17/06/2024	3:42:32 PM	1,795.0000	73	XCSE
Genmab A/S	17/06/2024	3:42:32 PM	1,795.0000	88	XCSE
Genmab A/S	17/06/2024	3:42:32 PM	1,795.0000	11	XCSE
Genmab A/S	17/06/2024	3:42:32 PM	1,795.0000	11	AQEU
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	10	AQEU
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	78	XCSE
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	79	XCSE
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	10	AQEU
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	10	AQEU
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	5	AQEU
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	5	AQEU
Genmab A/S	17/06/2024	3:42:43 PM	1,795.0000	4	AQEU
Genmab A/S	17/06/2024	3:43:47 PM	1,794.0000	11	AQEU
Genmab A/S	17/06/2024	3:43:47 PM	1,794.0000	80	XCSE
Genmab A/S	17/06/2024	3:43:47 PM	1,794.0000	11	AQEU
Genmab A/S	17/06/2024	3:44:25 PM	1,794.0000	6	AQEU

59

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:44:33 PM	1,794.0000	6	AQEU
Genmab A/S	17/06/2024	3:45:19 PM	1,796.0000	36	CEUX
Genmab A/S	17/06/2024	3:45:19 PM	1,796.0000	1	CEUX
Genmab A/S	17/06/2024	3:45:19 PM	1,796.0000	31	XCSE
Genmab A/S	17/06/2024	3:45:28 PM	1,796.0000	21	CEUX
Genmab A/S	17/06/2024	3:45:28 PM	1,796.0000	18	CEUX
Genmab A/S	17/06/2024	3:45:39 PM	1,796.0000	8	XCSE
Genmab A/S	17/06/2024	3:45:42 PM	1,796.0000	35	XCSE
Genmab A/S	17/06/2024	3:45:53 PM	1,796.0000	36	CEUX
Genmab A/S	17/06/2024	3:46:03 PM	1,796.0000	8	AQEU
Genmab A/S	17/06/2024	3:46:03 PM	1,796.0000	26	AQEU
Genmab A/S	17/06/2024	3:46:08 PM	1,795.5000	107	XCSE
Genmab A/S	17/06/2024	3:46:08 PM	1,795.5000	107	XCSE
Genmab A/S	17/06/2024	3:46:08 PM	1,795.5000	12	XCSE
Genmab A/S	17/06/2024	3:46:13 PM	1,795.5000	6	XCSE
Genmab A/S	17/06/2024	3:46:27 PM	1,795.5000	5	XCSE
Genmab A/S	17/06/2024	3:46:28 PM	1,795.5000	89	XCSE
Genmab A/S	17/06/2024	3:46:28 PM	1,795.5000	10	XCSE
Genmab A/S	17/06/2024	3:46:28 PM	1,795.5000	11	XCSE
Genmab A/S	17/06/2024	3:46:28 PM	1,795.5000	9	XCSE
Genmab A/S	17/06/2024	3:46:28 PM	1,795.5000	13	XCSE
Genmab A/S	17/06/2024	3:46:28 PM	1,795.5000	41	XCSE
Genmab A/S	17/06/2024	3:46:28 PM	1,795.5000	10	XCSE
Genmab A/S	17/06/2024	3:47:28 PM	1,794.5000	83	XCSE
Genmab A/S	17/06/2024	3:47:28 PM	1,794.5000	13	AQEU
Genmab A/S	17/06/2024	3:47:55 PM	1,794.5000	10	AQEU
Genmab A/S	17/06/2024	3:47:55 PM	1,794.5000	17	AQEU
Genmab A/S	17/06/2024	3:47:55 PM	1,794.5000	10	XCSE
Genmab A/S	17/06/2024	3:47:55 PM	1,794.5000	42	XCSE
Genmab A/S	17/06/2024	3:48:15 PM	1,794.0000	3	AQEU
Genmab A/S	17/06/2024	3:48:15 PM	1,794.0000	10	AQEU
Genmab A/S	17/06/2024	3:49:32 PM	1,794.5000	37	TQEX
Genmab A/S	17/06/2024	3:49:44 PM	1,795.5000	8	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	16	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	9	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	4	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	15	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	15	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	4	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	4	XCSE

60

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	15	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	15	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	4	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	4	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	15	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	30	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	10	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	9	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	9	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	30	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	7	XCSE
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:50:03 PM	1,795.0000	1	AQEU
Genmab A/S	17/06/2024	3:50:13 PM	1,794.0000	7	AQEU
Genmab A/S	17/06/2024	3:51:03 PM	1,794.5000	89	XCSE
Genmab A/S	17/06/2024	3:51:03 PM	1,794.5000	117	XCSE
Genmab A/S	17/06/2024	3:51:03 PM	1,794.5000	19	XCSE
Genmab A/S	17/06/2024	3:51:03 PM	1,794.5000	15	XCSE
Genmab A/S	17/06/2024	3:51:39 PM	1,794.5000	70	XCSE
Genmab A/S	17/06/2024	3:51:39 PM	1,794.5000	164	XCSE
Genmab A/S	17/06/2024	3:51:39 PM	1,794.5000	9	AQEU
Genmab A/S	17/06/2024	3:51:39 PM	1,794.5000	9	AQEU
Genmab A/S	17/06/2024	3:51:39 PM	1,794.5000	9	AQEU
Genmab A/S	17/06/2024	3:51:39 PM	1,794.5000	9	AQEU
Genmab A/S	17/06/2024	3:51:39 PM	1,794.5000	8	AQEU
Genmab A/S	17/06/2024	3:52:59 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:52:59 PM	1,795.0000	2	AQEU
Genmab A/S	17/06/2024	3:52:59 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:52:59 PM	1,795.0000	15	XCSE
Genmab A/S	17/06/2024	3:52:59 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	3:52:59 PM	1,795.0000	2	AQEU
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	55	XCSE
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	7	AQEU
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	8	AQEU
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	7	AQEU
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	43	XCSE
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	12	XCSE
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	16	XCSE
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	7	AQEU
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	12	XCSE
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	7	AQEU
Genmab A/S	17/06/2024	3:53:32 PM	1,795.0000	8	AQEU
Genmab A/S	17/06/2024	3:54:38 PM	1,794.5000	5	AQEU

61

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	3:55:53 PM	1,795.5000	1	XCSE
Genmab A/S	17/06/2024	3:55:53 PM	1,795.5000	26	XCSE
Genmab A/S	17/06/2024	3:55:53 PM	1,795.5000	52	XCSE
Genmab A/S	17/06/2024	3:55:53 PM	1,795.5000	27	XCSE
Genmab A/S	17/06/2024	3:55:53 PM	1,795.5000	27	XCSE
Genmab A/S	17/06/2024	3:55:53 PM	1,795.5000	27	XCSE
Genmab A/S	17/06/2024	3:55:53 PM	1,795.5000	6	XCSE
Genmab A/S	17/06/2024	3:56:13 PM	1,795.5000	10	XCSE
Genmab A/S	17/06/2024	3:56:13 PM	1,795.5000	11	XCSE
Genmab A/S	17/06/2024	3:56:14 PM	1,795.5000	27	XCSE
Genmab A/S	17/06/2024	3:56:14 PM	1,795.5000	27	XCSE
Genmab A/S	17/06/2024	3:56:14 PM	1,795.5000	5	XCSE
Genmab A/S	17/06/2024	3:56:14 PM	1,795.5000	22	XCSE
Genmab A/S	17/06/2024	3:56:14 PM	1,795.5000	27	XCSE
Genmab A/S	17/06/2024	3:56:16 PM	1,795.0000	38	XCSE
Genmab A/S	17/06/2024	3:56:16 PM	1,795.0000	10	XCSE
Genmab A/S	17/06/2024	3:56:16 PM	1,795.0000	8	XCSE
Genmab A/S	17/06/2024	3:56:16 PM	1,795.0000	40	XCSE
Genmab A/S	17/06/2024	3:56:16 PM	1,795.0000	10	XCSE
Genmab A/S	17/06/2024	3:57:13 PM	1,794.5000	26	XCSE
Genmab A/S	17/06/2024	3:57:13 PM	1,794.5000	26	XCSE
Genmab A/S	17/06/2024	3:57:13 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	3:57:47 PM	1,794.5000	2	XCSE
Genmab A/S	17/06/2024	3:57:49 PM	1,794.5000	37	XCSE
Genmab A/S	17/06/2024	3:58:33 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	3:58:33 PM	1,795.0000	6	XCSE
Genmab A/S	17/06/2024	3:58:53 PM	1,795.0000	21	AQEU
Genmab A/S	17/06/2024	3:58:53 PM	1,795.0000	16	XCSE
Genmab A/S	17/06/2024	3:58:53 PM	1,795.0000	8	XCSE
Genmab A/S	17/06/2024	3:58:53 PM	1,795.0000	40	XCSE
Genmab A/S	17/06/2024	3:59:59 PM	1,795.0000	22	XCSE
Genmab A/S	17/06/2024	3:59:59 PM	1,795.0000	24	XCSE
Genmab A/S	17/06/2024	3:59:59 PM	1,795.0000	152	XCSE
Genmab A/S	17/06/2024	3:59:59 PM	1,795.0000	22	XCSE
Genmab A/S	17/06/2024	3:59:59 PM	1,795.0000	24	XCSE
Genmab A/S	17/06/2024	4:00:02 PM	1,796.5000	15	XCSE
Genmab A/S	17/06/2024	4:00:07 PM	1,796.0000	137	XCSE
Genmab A/S	17/06/2024	4:00:07 PM	1,796.0000	137	XCSE
Genmab A/S	17/06/2024	4:00:07 PM	1,796.0000	23	XCSE
Genmab A/S	17/06/2024	4:00:07 PM	1,796.0000	114	XCSE
Genmab A/S	17/06/2024	4:00:07 PM	1,796.0000	13	XCSE
Genmab A/S	17/06/2024	4:00:18 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	4:00:18 PM	1,795.0000	1	XCSE
Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	17	XCSE
Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	35	XCSE
Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	15	XCSE
Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	50	XCSE
Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	50	XCSE
Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	2	AQEU

62

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	12	AQEU
Genmab A/S	17/06/2024	4:00:54 PM	1,794.5000	11	XCSE
Genmab A/S	17/06/2024	4:00:57 PM	1,794.5000	137	XCSE
Genmab A/S	17/06/2024	4:00:57 PM	1,794.5000	15	XCSE
Genmab A/S	17/06/2024	4:00:57 PM	1,794.5000	18	XCSE
Genmab A/S	17/06/2024	4:02:23 PM	1,794.0000	4	AQEU
Genmab A/S	17/06/2024	4:02:25 PM	1,794.0000	4	AQEU
Genmab A/S	17/06/2024	4:02:25 PM	1,794.0000	17	XCSE
Genmab A/S	17/06/2024	4:03:27 PM	1,793.5000	11	XCSE
Genmab A/S	17/06/2024	4:03:27 PM	1,793.5000	198	XCSE
Genmab A/S	17/06/2024	4:03:27 PM	1,793.5000	41	XCSE
Genmab A/S	17/06/2024	4:03:27 PM	1,793.5000	13	XCSE
Genmab A/S	17/06/2024	4:03:27 PM	1,793.5000	25	XCSE
Genmab A/S	17/06/2024	4:03:27 PM	1,793.5000	33	XCSE
Genmab A/S	17/06/2024	4:03:31 PM	1,793.5000	27	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	3	AQEU
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	16	AQEU
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	22	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	15	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	100	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	35	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	22	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	78	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	22	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	40	XCSE
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	3	AQEU
Genmab A/S	17/06/2024	4:05:04 PM	1,795.5000	22	XCSE
Genmab A/S	17/06/2024	4:05:13 PM	1,793.5000	52	XCSE
Genmab A/S	17/06/2024	4:05:13 PM	1,793.5000	50	XCSE
Genmab A/S	17/06/2024	4:05:13 PM	1,793.5000	297	XCSE
Genmab A/S	17/06/2024	4:05:13 PM	1,793.5000	222	XCSE
Genmab A/S	17/06/2024	4:08:50 PM	1,794.0000	23	XCSE
Genmab A/S	17/06/2024	4:08:50 PM	1,794.0000	3	XCSE
Genmab A/S	17/06/2024	4:10:18 PM	1,795.0000	11	XCSE
Genmab A/S	17/06/2024	4:10:18 PM	1,795.0000	28	XCSE
Genmab A/S	17/06/2024	4:10:28 PM	1,795.0000	22	XCSE
Genmab A/S	17/06/2024	4:10:28 PM	1,795.0000	7	XCSE
Genmab A/S	17/06/2024	4:10:28 PM	1,795.0000	6	XCSE
Genmab A/S	17/06/2024	4:10:32 PM	1,794.0000	23	XCSE
Genmab A/S	17/06/2024	4:10:32 PM	1,794.0000	52	XCSE
Genmab A/S	17/06/2024	4:10:32 PM	1,794.0000	92	XCSE
Genmab A/S	17/06/2024	4:10:32 PM	1,794.0000	50	XCSE
Genmab A/S	17/06/2024	4:10:32 PM	1,794.0000	17	XCSE
Genmab A/S	17/06/2024	4:10:36 PM	1,794.0000	23	XCSE
Genmab A/S	17/06/2024	4:10:50 PM	1,793.5000	189	XCSE
Genmab A/S	17/06/2024	4:10:50 PM	1,793.5000	174	XCSE
Genmab A/S	17/06/2024	4:10:50 PM	1,793.5000	22	XCSE
Genmab A/S	17/06/2024	4:11:25 PM	1,792.0000	6	AQEU
Genmab A/S	17/06/2024	4:12:27 PM	1,792.5000	6	AQEU

63

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	4:12:27 PM	1,792.5000	40	XCSE
Genmab A/S	17/06/2024	4:12:27 PM	1,792.5000	2	AQEU
Genmab A/S	17/06/2024	4:12:50 PM	1,792.0000	20	AQEU
Genmab A/S	17/06/2024	4:12:50 PM	1,792.0000	157	XCSE
Genmab A/S	17/06/2024	4:12:51 PM	1,791.5000	47	XCSE
Genmab A/S	17/06/2024	4:12:51 PM	1,791.5000	72	XCSE
Genmab A/S	17/06/2024	4:12:51 PM	1,791.5000	27	XCSE
Genmab A/S	17/06/2024	4:12:51 PM	1,791.5000	20	XCSE
Genmab A/S	17/06/2024	4:12:51 PM	1,791.5000	7	XCSE
Genmab A/S	17/06/2024	4:14:43 PM	1,794.5000	26	XCSE
Genmab A/S	17/06/2024	4:14:43 PM	1,794.5000	22	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	9	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	10	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	9	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	10	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	3	AQEU
Genmab A/S	17/06/2024	4:15:18 PM	1,795.0000	19	XCSE
Genmab A/S	17/06/2024	4:16:05 PM	1,795.0000	250	XCSE
Genmab A/S	17/06/2024	4:16:05 PM	1,795.0000	22	XCSE
Genmab A/S	17/06/2024	4:16:05 PM	1,795.0000	22	XCSE
Genmab A/S	17/06/2024	4:16:05 PM	1,795.0000	1	XCSE
Genmab A/S	17/06/2024	4:16:05 PM	1,795.0000	22	XCSE
Genmab A/S	17/06/2024	4:16:05 PM	1,795.0000	22	XCSE
Genmab A/S	17/06/2024	4:16:59 PM	1,795.0000	24	XCSE
Genmab A/S	17/06/2024	4:16:59 PM	1,795.0000	3	XCSE
Genmab A/S	17/06/2024	4:17:02 PM	1,795.0000	24	XCSE
Genmab A/S	17/06/2024	4:17:02 PM	1,795.0000	1	XCSE
Genmab A/S	17/06/2024	4:18:49 PM	1,794.5000	1	AQEU
Genmab A/S	17/06/2024	4:18:49 PM	1,794.5000	16	AQEU
Genmab A/S	17/06/2024	4:18:49 PM	1,794.5000	15	AQEU
Genmab A/S	17/06/2024	4:18:49 PM	1,794.5000	7	XCSE
Genmab A/S	17/06/2024	4:19:07 PM	1,795.0000	10	XCSE
Genmab A/S	17/06/2024	4:19:07 PM	1,795.0000	28	XCSE
Genmab A/S	17/06/2024	4:19:22 PM	1,795.0000	9	AQEU
Genmab A/S	17/06/2024	4:19:22 PM	1,795.0000	26	AQEU
Genmab A/S	17/06/2024	4:19:22 PM	1,795.0000	8	AQEU
Genmab A/S	17/06/2024	4:19:22 PM	1,795.0000	4	AQEU
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	41	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	25	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	3	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	22	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	67	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	7	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	11	XCSE

64

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	7	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	8	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	25	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	25	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	15	XCSE
Genmab A/S	17/06/2024	4:19:24 PM	1,794.5000	25	XCSE
Genmab A/S	17/06/2024	4:19:25 PM	1,794.0000	6	XCSE
Genmab A/S	17/06/2024	4:19:25 PM	1,794.0000	16	XCSE
Genmab A/S	17/06/2024	4:19:25 PM	1,794.0000	4	XCSE
Genmab A/S	17/06/2024	4:19:25 PM	1,794.0000	7	XCSE
Genmab A/S	17/06/2024	4:19:25 PM	1,794.0000	26	XCSE
Genmab A/S	17/06/2024	4:19:25 PM	1,794.0000	14	XCSE
Genmab A/S	17/06/2024	4:19:26 PM	1,794.0000	26	XCSE
Genmab A/S	17/06/2024	4:19:26 PM	1,794.0000	309	XCSE
Genmab A/S	17/06/2024	4:19:26 PM	1,794.0000	2	XCSE
Genmab A/S	17/06/2024	4:22:55 PM	1,795.5000	42	XCSE
Genmab A/S	17/06/2024	4:22:55 PM	1,795.5000	9	XCSE
Genmab A/S	17/06/2024	4:22:55 PM	1,795.5000	21	XCSE
Genmab A/S	17/06/2024	4:22:55 PM	1,795.5000	21	XCSE
Genmab A/S	17/06/2024	4:22:55 PM	1,795.5000	42	XCSE
Genmab A/S	17/06/2024	4:22:55 PM	1,795.5000	41	XCSE
Genmab A/S	17/06/2024	4:23:50 PM	1,796.0000	9	AQEU
Genmab A/S	17/06/2024	4:23:50 PM	1,796.0000	16	AQEU
Genmab A/S	17/06/2024	4:23:50 PM	1,796.0000	15	AQEU
Genmab A/S	17/06/2024	4:24:41 PM	1,795.5000	106	XCSE
Genmab A/S	17/06/2024	4:24:41 PM	1,795.5000	106	XCSE
Genmab A/S	17/06/2024	4:25:00 PM	1,795.5000	76	XCSE
Genmab A/S	17/06/2024	4:25:30 PM	1,797.0000	4	CEUX
Genmab A/S	17/06/2024	4:25:37 PM	1,797.0000	153	XCSE
Genmab A/S	17/06/2024	4:25:37 PM	1,797.0000	39	XCSE
Genmab A/S	17/06/2024	4:25:37 PM	1,797.0000	30	XCSE
Genmab A/S	17/06/2024	4:25:37 PM	1,797.0000	123	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	26	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	222	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	28	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	26	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	23	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	3	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	26	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	26	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	28	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	7	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	12	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	7	XCSE
Genmab A/S	17/06/2024	4:26:36 PM	1,797.0000	3	XCSE
Genmab A/S	17/06/2024	4:29:08 PM	1,797.0000	30	XCSE
Genmab A/S	17/06/2024	4:29:08 PM	1,797.0000	253	XCSE
Genmab A/S	17/06/2024	4:29:08 PM	1,797.0000	47	XCSE
Genmab A/S	17/06/2024	4:29:08 PM	1,797.0000	13	XCSE

65

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	4:29:08 PM	1,797.0000	12	XCSE
Genmab A/S	17/06/2024	4:29:12 PM	1,797.0000	106	XCSE
Genmab A/S	17/06/2024	4:29:12 PM	1,797.0000	110	XCSE
Genmab A/S	17/06/2024	4:29:12 PM	1,796.0000	37	XCSE
Genmab A/S	17/06/2024	4:29:12 PM	1,796.0000	8	XCSE
Genmab A/S	17/06/2024	4:29:12 PM	1,796.0000	18	XCSE
Genmab A/S	17/06/2024	4:30:46 PM	1,795.5000	78	XCSE
Genmab A/S	17/06/2024	4:32:25 PM	1,799.5000	50	XCSE
Genmab A/S	17/06/2024	4:32:25 PM	1,799.5000	100	XCSE
Genmab A/S	17/06/2024	4:32:25 PM	1,799.5000	65	XCSE
Genmab A/S	17/06/2024	4:32:25 PM	1,799.5000	49	XCSE
Genmab A/S	17/06/2024	4:32:28 PM	1,799.0000	47	XCSE
Genmab A/S	17/06/2024	4:32:28 PM	1,799.0000	47	XCSE
Genmab A/S	17/06/2024	4:32:28 PM	1,799.0000	47	XCSE
Genmab A/S	17/06/2024	4:32:28 PM	1,799.0000	3	XCSE
Genmab A/S	17/06/2024	4:32:29 PM	1,799.0000	47	XCSE
Genmab A/S	17/06/2024	4:35:00 PM	1,799.5000	10	AQEU
Genmab A/S	17/06/2024	4:35:00 PM	1,799.5000	16	AQEU
Genmab A/S	17/06/2024	4:35:10 PM	1,799.5000	2	AQEU
Genmab A/S	17/06/2024	4:35:10 PM	1,799.5000	16	AQEU
Genmab A/S	17/06/2024	4:35:10 PM	1,799.5000	11	AQEU
Genmab A/S	17/06/2024	4:35:14 PM	1,799.5000	11	AQEU
Genmab A/S	17/06/2024	4:35:14 PM	1,799.5000	2	AQEU
Genmab A/S	17/06/2024	4:35:14 PM	1,799.5000	16	AQEU
Genmab A/S	17/06/2024	4:35:14 PM	1,799.5000	4	AQEU
Genmab A/S	17/06/2024	4:35:23 PM	1,799.5000	4	AQEU
Genmab A/S	17/06/2024	4:35:23 PM	1,799.5000	11	AQEU
Genmab A/S	17/06/2024	4:35:23 PM	1,799.5000	4	AQEU
Genmab A/S	17/06/2024	4:35:33 PM	1,799.5000	14	CEUX
Genmab A/S	17/06/2024	4:35:33 PM	1,799.5000	3	CEUX
Genmab A/S	17/06/2024	4:35:45 PM	1,799.5000	5	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	74	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	146	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	77	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	77	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	38	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	108	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	189	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	38	XCSE
Genmab A/S	17/06/2024	4:36:09 PM	1,799.5000	35	XCSE
Genmab A/S	17/06/2024	4:36:11 PM	1,798.0000	15	XCSE
Genmab A/S	17/06/2024	4:36:11 PM	1,798.0000	35	XCSE
Genmab A/S	17/06/2024	4:36:11 PM	1,798.0000	35	XCSE
Genmab A/S	17/06/2024	4:36:11 PM	1,798.0000	50	XCSE
Genmab A/S	17/06/2024	4:38:17 PM	1,798.0000	6	XCSE
Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	22	XCSE
Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	40	XCSE
Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	22	XCSE
Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	18	XCSE

66

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	22	XCSE
Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	22	XCSE
Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	22	XCSE
Genmab A/S	17/06/2024	4:40:25 PM	1,799.0000	1	XCSE
Genmab A/S	17/06/2024	4:40:47 PM	1,798.5000	5	XCSE
Genmab A/S	17/06/2024	4:41:26 PM	1,799.0000	24	TQEX
Genmab A/S	17/06/2024	4:41:26 PM	1,799.0000	1	TQEX
Genmab A/S	17/06/2024	4:41:39 PM	1,799.5000	31	XCSE
Genmab A/S	17/06/2024	4:41:39 PM	1,799.5000	4	XCSE
Genmab A/S	17/06/2024	4:41:39 PM	1,799.5000	15	XCSE
Genmab A/S	17/06/2024	4:41:39 PM	1,799.5000	59	XCSE
Genmab A/S	17/06/2024	4:41:39 PM	1,799.5000	23	XCSE
Genmab A/S	17/06/2024	4:41:39 PM	1,799.5000	9	XCSE
Genmab A/S	17/06/2024	4:41:39 PM	1,799.5000	7	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	41	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	100	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	62	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	53	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	26	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	1	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	25	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	178	XCSE
Genmab A/S	17/06/2024	4:42:07 PM	1,799.5000	143	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	25	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	34	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	210	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	10	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	212	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	32	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	158	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	5	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	11	XCSE
Genmab A/S	17/06/2024	4:44:02 PM	1,799.5000	174	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	27	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	1	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	23	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	59	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	26	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	2	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	68	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	5	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	18	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	5	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	18	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:07 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:08 PM	1,801.0000	28	XCSE

67

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	4:47:08 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:08 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:09 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:09 PM	1,801.0000	25	XCSE
Genmab A/S	17/06/2024	4:47:09 PM	1,801.0000	3	XCSE
Genmab A/S	17/06/2024	4:47:10 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:11 PM	1,801.0000	28	XCSE
Genmab A/S	17/06/2024	4:47:21 PM	1,800.5000	105	XCSE
Genmab A/S	17/06/2024	4:47:21 PM	1,800.5000	12	XCSE
Genmab A/S	17/06/2024	4:47:36 PM	1,800.5000	105	XCSE
Genmab A/S	17/06/2024	4:47:36 PM	1,800.5000	4	XCSE
Genmab A/S	17/06/2024	4:47:36 PM	1,800.5000	16	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,800.5000	24	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,800.5000	61	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,800.5000	41	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,800.5000	64	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,800.5000	23	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,800.5000	52	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,799.5000	14	XCSE
Genmab A/S	17/06/2024	4:47:37 PM	1,799.5000	36	XCSE
Genmab A/S	17/06/2024	4:47:38 PM	1,799.5000	50	XCSE
Genmab A/S	17/06/2024	4:47:40 PM	1,799.5000	17	XCSE
Genmab A/S	17/06/2024	4:47:40 PM	1,799.5000	33	XCSE
Genmab A/S	17/06/2024	4:47:40 PM	1,799.5000	17	XCSE
Genmab A/S	17/06/2024	4:48:53 PM	1,798.0000	13	XCSE
Genmab A/S	17/06/2024	4:49:02 PM	1,798.0000	10	XCSE
Genmab A/S	17/06/2024	4:49:07 PM	1,798.0000	3	XCSE
Genmab A/S	17/06/2024	4:50:06 PM	1,799.0000	20	XCSE
Genmab A/S	17/06/2024	4:50:06 PM	1,799.0000	10	XCSE
Genmab A/S	17/06/2024	4:50:06 PM	1,799.0000	3	XCSE
Genmab A/S	17/06/2024	4:50:38 PM	1,798.5000	22	XCSE
Genmab A/S	17/06/2024	4:50:38 PM	1,798.5000	13	XCSE
Genmab A/S	17/06/2024	4:50:38 PM	1,798.5000	9	XCSE
Genmab A/S	17/06/2024	4:50:38 PM	1,798.5000	4	XCSE
Genmab A/S	17/06/2024	4:50:49 PM	1,798.5000	59	XCSE
Genmab A/S	17/06/2024	4:50:49 PM	1,798.5000	25	XCSE
Genmab A/S	17/06/2024	4:50:49 PM	1,798.5000	3	XCSE
Genmab A/S	17/06/2024	4:50:49 PM	1,798.0000	7	XCSE
Genmab A/S	17/06/2024	4:50:52 PM	1,798.0000	18	XCSE
Genmab A/S	17/06/2024	4:50:52 PM	1,798.0000	15	XCSE
Genmab A/S	17/06/2024	4:51:00 PM	1,798.0000	13	XCSE
Genmab A/S	17/06/2024	4:51:01 PM	1,798.0000	32	XCSE
Genmab A/S	17/06/2024	4:51:01 PM	1,798.0000	99	XCSE
Genmab A/S	17/06/2024	4:51:01 PM	1,798.0000	13	XCSE
Genmab A/S	17/06/2024	4:51:37 PM	1,798.5000	16	XCSE
Genmab A/S	17/06/2024	4:51:37 PM	1,798.5000	13	XCSE
Genmab A/S	17/06/2024	4:51:37 PM	1,798.5000	14	XCSE
Genmab A/S	17/06/2024	4:51:37 PM	1,798.5000	13	XCSE
Genmab A/S	17/06/2024	4:51:37 PM	1,798.5000	46	XCSE

68

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	17/06/2024	4:51:37 PM	1,798.5000	26	XCSE
Genmab A/S	17/06/2024	4:51:37 PM	1,798.0000	25	XCSE
Genmab A/S	17/06/2024	4:51:45 PM	1,799.0000	21	XCSE
Genmab A/S	17/06/2024	4:51:47 PM	1,799.0000	33	XCSE
Genmab A/S	17/06/2024	4:51:47 PM	1,799.0000	30	XCSE
Genmab A/S	17/06/2024	4:51:47 PM	1,799.0000	33	XCSE
Genmab A/S	17/06/2024	4:51:47 PM	1,799.0000	13	XCSE
Genmab A/S	17/06/2024	4:52:14 PM	1,799.5000	5	XCSE
Genmab A/S	17/06/2024	4:52:14 PM	1,799.5000	23	XCSE
Genmab A/S	17/06/2024	4:52:14 PM	1,799.5000	59	XCSE
Genmab A/S	17/06/2024	4:52:14 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	4:52:15 PM	1,799.5000	12	XCSE
Genmab A/S	17/06/2024	4:52:15 PM	1,799.5000	23	XCSE
Genmab A/S	17/06/2024	4:52:15 PM	1,799.5000	59	XCSE
Genmab A/S	17/06/2024	4:52:16 PM	1,799.5000	11	XCSE
Genmab A/S	17/06/2024	4:52:16 PM	1,799.5000	59	XCSE
Genmab A/S	17/06/2024	4:52:16 PM	1,799.5000	23	XCSE
Genmab A/S	17/06/2024	4:52:20 PM	1,799.5000	10	XCSE
Genmab A/S	17/06/2024	4:52:20 PM	1,799.5000	23	XCSE
Genmab A/S	17/06/2024	4:52:20 PM	1,799.5000	69	XCSE
Genmab A/S	17/06/2024	4:52:25 PM	1,799.5000	31	XCSE
Genmab A/S	17/06/2024	4:52:25 PM	1,799.5000	8	XCSE
Genmab A/S	17/06/2024	4:52:28 PM	1,799.5000	22	XCSE
Genmab A/S	17/06/2024	4:52:28 PM	1,799.5000	10	XCSE
Genmab A/S	17/06/2024	4:52:28 PM	1,799.5000	6	XCSE
Genmab A/S	17/06/2024	4:53:57 PM	1,799.5000	47	XCSE
Genmab A/S	17/06/2024	4:53:57 PM	1,799.5000	2	XCSE
Genmab A/S	17/06/2024	4:53:57 PM	1,799.5000	49	XCSE
Genmab A/S	17/06/2024	4:53:57 PM	1,799.5000	47	XCSE
Genmab A/S	17/06/2024	4:54:49 PM	1,799.0000	3	XCSE
Genmab A/S	17/06/2024	4:54:50 PM	1,799.0000	23	XCSE
Genmab A/S	17/06/2024	4:54:50 PM	1,799.0000	19	XCSE
Genmab A/S	17/06/2024	4:54:50 PM	1,799.0000	19	XCSE
Genmab A/S	17/06/2024	4:54:50 PM	1,799.0000	35	XCSE
Genmab A/S	17/06/2024	4:54:50 PM	1,799.0000	13	XCSE
Genmab A/S	17/06/2024	4:54:50 PM	1,799.0000	6	XCSE
Genmab A/S	17/06/2024	4:54:50 PM	1,798.5000	64	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,787.5000	10	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,787.5000	28	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	13	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	13	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	41	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	13	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	45	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE

69

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	13	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	2	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	11	XCSE
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	12	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	10	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	12	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	3	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	7	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	3	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,785.5000	5	TQEX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	9	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	1	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	9	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	3	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	9	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	2	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	8	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	12	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	10	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	10	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	2	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	10	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	12	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	9	CEUX
Genmab A/S	18/06/2024	9:02:03 AM	1,786.0000	1	CEUX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	48	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE

70

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	3	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	1	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	34	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	25	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	43	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	7	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	9	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	18	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	16	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	18	XCSE
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	5	TQEX
Genmab A/S	18/06/2024	9:02:26 AM	1,787.0000	21	TQEX
Genmab A/S	18/06/2024	9:04:08 AM	1,780.0000	8	XCSE
Genmab A/S	18/06/2024	9:04:08 AM	1,780.0000	12	XCSE
Genmab A/S	18/06/2024	9:04:08 AM	1,780.0000	13	CEUX
Genmab A/S	18/06/2024	9:04:08 AM	1,780.0000	13	CEUX
Genmab A/S	18/06/2024	9:04:08 AM	1,780.0000	5	TQEX
Genmab A/S	18/06/2024	9:04:08 AM	1,780.0000	5	TQEX
Genmab A/S	18/06/2024	9:04:35 AM	1,784.0000	8	CEUX
Genmab A/S	18/06/2024	9:04:35 AM	1,784.0000	86	CEUX
Genmab A/S	18/06/2024	9:04:42 AM	1,782.5000	20	CEUX
Genmab A/S	18/06/2024	9:04:42 AM	1,782.5000	2	CEUX
Genmab A/S	18/06/2024	9:04:46 AM	1,782.5000	22	CEUX
Genmab A/S	18/06/2024	9:04:58 AM	1,784.0000	9	CEUX
Genmab A/S	18/06/2024	9:04:58 AM	1,784.0000	22	CEUX
Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	27	XCSE
Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	27	XCSE
Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	26	CEUX
Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	11	CEUX

71

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	26	CEUX
Genmab A/S	18/06/2024	9:05:43 AM	1,784.0000	4	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	27	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	2	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	1	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	7	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	26	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	12	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	39	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	CEUX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	11	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	9	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	2	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	2	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	2	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:44 AM	1,783.0000	16	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,783.0000	9	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	27	XCSE
Genmab A/S	18/06/2024	9:05:44 AM	1,784.0000	1	CEUX
Genmab A/S	18/06/2024	9:05:46 AM	1,783.0000	23	CEUX
Genmab A/S	18/06/2024	9:05:46 AM	1,783.0000	5	TQEX
Genmab A/S	18/06/2024	9:05:52 AM	1,780.5000	52	XCSE
Genmab A/S	18/06/2024	9:07:28 AM	1,783.0000	9	XCSE
Genmab A/S	18/06/2024	9:07:28 AM	1,783.0000	28	XCSE
Genmab A/S	18/06/2024	9:07:28 AM	1,783.0000	24	XCSE
Genmab A/S	18/06/2024	9:08:52 AM	1,788.5000	42	XCSE

72

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:08:52 AM	1,788.5000	42	XCSE
Genmab A/S	18/06/2024	9:08:52 AM	1,788.5000	50	XCSE
Genmab A/S	18/06/2024	9:08:52 AM	1,788.5000	13	XCSE
Genmab A/S	18/06/2024	9:08:52 AM	1,788.5000	24	XCSE
Genmab A/S	18/06/2024	9:08:52 AM	1,788.5000	5	XCSE
Genmab A/S	18/06/2024	9:08:52 AM	1,788.5000	13	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	42	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	42	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	9	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	42	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	42	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	8	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	14	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	6	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	22	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	6	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	42	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	40	XCSE
Genmab A/S	18/06/2024	9:08:53 AM	1,788.5000	2	XCSE
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	3	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	22	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	5	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	25	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	8	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	8	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	17	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	19	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	6	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	27	XCSE
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	25	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	25	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	25	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	13	CEUX
Genmab A/S	18/06/2024	9:10:18 AM	1,793.5000	12	CEUX
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	8	CEUX
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	17	CEUX
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	5	TQEX
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	5	TQEX
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	27	XCSE
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	27	XCSE
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	5	TQEX
Genmab A/S	18/06/2024	9:10:19 AM	1,793.0000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	AQEU
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	10	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	10	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	3	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX

73

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	6	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	10	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	4	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	10	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	AQEU
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	3	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	2	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	10	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	AQEU
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	8	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	AQEU
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	7	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	2	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	2	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	AQEU
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	9	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	8	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	5	TQEX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	8	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	8	CEUX
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	AQEU
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	1	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	8	XCSE
Genmab A/S	18/06/2024	9:10:57 AM	1,792.5000	4	XCSE
Genmab A/S	18/06/2024	9:10:59 AM	1,791.5000	54	TQEX
Genmab A/S	18/06/2024	9:11:44 AM	1,790.0000	4	XCSE
Genmab A/S	18/06/2024	9:11:44 AM	1,790.0000	18	XCSE
Genmab A/S	18/06/2024	9:11:44 AM	1,790.0000	22	XCSE
Genmab A/S	18/06/2024	9:11:44 AM	1,790.0000	4	XCSE
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	1	XCSE
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	23	XCSE
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	24	CEUX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	24	CEUX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	24	CEUX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	24	XCSE
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	24	XCSE

74

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	12	CEUX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	3	AQEU
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	2	CEUX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	3	AQEU
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	24	XCSE
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	56	CEUX
Genmab A/S	18/06/2024	9:12:35 AM	1,790.0000	13	CEUX
Genmab A/S	18/06/2024	9:12:45 AM	1,788.5000	13	XCSE
Genmab A/S	18/06/2024	9:12:45 AM	1,788.5000	9	XCSE
Genmab A/S	18/06/2024	9:13:20 AM	1,788.5000	15	XCSE
Genmab A/S	18/06/2024	9:13:20 AM	1,788.5000	33	XCSE
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	23	XCSE
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	10	XCSE
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	25	XCSE
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	21	CEUX
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	21	CEUX
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	13	CEUX
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	8	CEUX
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	5	TQEX
Genmab A/S	18/06/2024	9:13:39 AM	1,789.0000	12	XCSE
Genmab A/S	18/06/2024	9:13:41 AM	1,789.0000	10	XCSE
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	10	XCSE
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	13	XCSE
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	23	XCSE
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	40	XCSE
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	21	CEUX
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	21	CEUX
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	21	CEUX
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	16	CEUX
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	3	AQEU
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:13:55 AM	1,790.0000	52	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	39	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	8	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	2	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	5	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	7	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	9	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	34	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	54	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	7	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	5	TQEX

75

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	3	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	7	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	7	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	5	TQEX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	9	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	11	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	9	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	9	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	9	XCSE
Genmab A/S	18/06/2024	9:16:41 AM	1,790.0000	10	CEUX
Genmab A/S	18/06/2024	9:17:06 AM	1,790.0000	72	XCSE
Genmab A/S	18/06/2024	9:17:06 AM	1,790.0000	65	CEUX
Genmab A/S	18/06/2024	9:17:06 AM	1,790.0000	10	AQEU
Genmab A/S	18/06/2024	9:17:06 AM	1,790.0000	10	TQEX
Genmab A/S	18/06/2024	9:17:36 AM	1,789.0000	56	CEUX
Genmab A/S	18/06/2024	9:17:36 AM	1,789.0000	7	CEUX
Genmab A/S	18/06/2024	9:17:36 AM	1,789.0000	9	AQEU
Genmab A/S	18/06/2024	9:17:36 AM	1,789.0000	10	TQEX
Genmab A/S	18/06/2024	9:17:36 AM	1,789.0000	70	XCSE
Genmab A/S	18/06/2024	9:17:36 AM	1,788.0000	47	XCSE
Genmab A/S	18/06/2024	9:17:36 AM	1,788.0000	47	XCSE
Genmab A/S	18/06/2024	9:17:36 AM	1,788.0000	47	XCSE
Genmab A/S	18/06/2024	9:17:36 AM	1,788.0000	9	XCSE
Genmab A/S	18/06/2024	9:17:37 AM	1,787.5000	50	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	9	CEUX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	2	AQEU
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	9	CEUX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	9	CEUX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	5	TQEX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	5	TQEX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	5	TQEX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	10	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	27	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	36	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	11	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	27	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	19	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	19	CEUX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	8	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	2	XCSE
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	7	CEUX
Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	7	CEUX

76

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:19:49 AM	1,789.0000	15	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	7	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	10	XCSE
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	3	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	10	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	10	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	1	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	2	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	3	CEUX
Genmab A/S	18/06/2024	9:21:09 AM	1,789.0000	5	TQEX
Genmab A/S	18/06/2024	9:21:12 AM	1,789.0000	10	XCSE
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	9	TQEX
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	56	CEUX
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	8	AQEU
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	62	XCSE
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	25	XCSE
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	25	XCSE
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	25	XCSE
Genmab A/S	18/06/2024	9:21:54 AM	1,788.0000	53	XCSE
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	5	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	28	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	75	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	74	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	74	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	1	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	18	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	1	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	74	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	1	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	13	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	11	AQEU
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	11	AQEU
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	11	AQEU
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	62	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	12	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	18	CEUX
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	11	AQEU
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	3	AQEU
Genmab A/S	18/06/2024	9:24:28 AM	1,789.0000	2	CEUX
Genmab A/S	18/06/2024	9:27:00 AM	1,795.5000	2	CEUX
Genmab A/S	18/06/2024	9:27:00 AM	1,795.5000	26	XCSE
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	8	XCSE
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	9	CEUX
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	9	CEUX
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	5	CEUX
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	4	CEUX
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	1	CEUX
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	5	TQEX

77

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	8	CEUX
Genmab A/S	18/06/2024	9:27:04 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	9:28:14 AM	1,795.5000	14	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	30	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	24	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	54	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	10	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	30	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	CEUX
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	5	TQEX
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	5	TQEX
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	30	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	CEUX
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	7	CEUX
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	5	TQEX
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	2	TQEX
Genmab A/S	18/06/2024	9:28:43 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	15	CEUX
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	15	CEUX
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	15	CEUX
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	15	CEUX
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	2	CEUX
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	5	TQEX
Genmab A/S	18/06/2024	9:28:44 AM	1,795.5000	15	XCSE
Genmab A/S	18/06/2024	9:28:45 AM	1,795.5000	20	XCSE
Genmab A/S	18/06/2024	9:28:45 AM	1,795.5000	35	XCSE
Genmab A/S	18/06/2024	9:28:45 AM	1,795.5000	27	XCSE
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	23	XCSE
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	21	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	14	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	7	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	7	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	21	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	7	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	14	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	10	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	3	AQEU
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	3	AQEU
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	3	AQEU
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	5	TQEX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	5	TQEX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	3	AQEU

78

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	3	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	23	XCSE
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	8	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	18	CEUX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	3	AQEU
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	5	TQEX
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	4	XCSE
Genmab A/S	18/06/2024	9:28:46 AM	1,794.5000	19	XCSE
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	10	CEUX
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	10	CEUX
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	10	CEUX
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	2	AQEU
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	2	AQEU
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	2	AQEU
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	2	AQEU
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	2	AQEU
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	24	XCSE
Genmab A/S	18/06/2024	9:31:47 AM	1,793.0000	10	XCSE
Genmab A/S	18/06/2024	9:31:51 AM	1,793.0000	10	XCSE
Genmab A/S	18/06/2024	9:33:38 AM	1,794.5000	22	XCSE
Genmab A/S	18/06/2024	9:34:27 AM	1,796.0000	8	CEUX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	24	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	20	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	55	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	41	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	20	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	115	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	55	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	56	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	45	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	25	XCSE
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	49	CEUX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	3	CEUX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	46	CEUX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	3	CEUX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	49	CEUX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	7	AQEU
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	7	AQEU
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	7	AQEU
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	8	TQEX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	8	TQEX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	8	TQEX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	8	TQEX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	49	CEUX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	7	AQEU
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	8	TQEX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	8	TQEX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	6	TQEX
Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	44	CEUX

79

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:35:25 AM	1,795.0000	7	AQEU
Genmab A/S	18/06/2024	9:35:26 AM	1,795.0000	50	XCSE
Genmab A/S	18/06/2024	9:35:26 AM	1,795.0000	50	XCSE
Genmab A/S	18/06/2024	9:35:26 AM	1,795.0000	19	XCSE
Genmab A/S	18/06/2024	9:35:26 AM	1,795.0000	50	XCSE
Genmab A/S	18/06/2024	9:35:26 AM	1,795.0000	3	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	3	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	CEUX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	1	AQEU
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	1	AQEU
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	5	AQEU
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	5	TQEX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	5	TQEX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	5	TQEX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	5	TQEX
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	32	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	15	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	8	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	13	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	25	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	22	XCSE
Genmab A/S	18/06/2024	9:37:20 AM	1,796.5000	16	XCSE
Genmab A/S	18/06/2024	9:40:16 AM	1,799.0000	24	XCSE
Genmab A/S	18/06/2024	9:40:16 AM	1,799.0000	54	XCSE
Genmab A/S	18/06/2024	9:40:16 AM	1,799.0000	30	XCSE
Genmab A/S	18/06/2024	9:40:16 AM	1,799.0000	3	CEUX
Genmab A/S	18/06/2024	9:40:16 AM	1,799.0000	6	CEUX
Genmab A/S	18/06/2024	9:40:28 AM	1,799.0000	37	CEUX
Genmab A/S	18/06/2024	9:40:39 AM	1,799.0000	27	XCSE
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	1	XCSE
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	12	XCSE
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	55	XCSE
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	49	CEUX
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	34	CEUX
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	8	TQEX

80

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	44	CEUX
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	5	CEUX
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	45	XCSE
Genmab A/S	18/06/2024	9:41:00 AM	1,799.0000	20	CEUX
Genmab A/S	18/06/2024	9:42:53 AM	1,799.5000	3	XCSE
Genmab A/S	18/06/2024	9:42:53 AM	1,799.5000	7	XCSE
Genmab A/S	18/06/2024	9:42:53 AM	1,799.5000	4	XCSE
Genmab A/S	18/06/2024	9:42:53 AM	1,799.5000	10	CEUX
Genmab A/S	18/06/2024	9:42:53 AM	1,799.5000	5	TQEX
Genmab A/S	18/06/2024	9:42:53 AM	1,799.5000	10	XCSE
Genmab A/S	18/06/2024	9:43:26 AM	1,800.5000	6	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,801.0000	80	CEUX
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	8	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	22	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	12	CEUX
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	12	CEUX
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	10	CEUX
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	9	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	12	CEUX
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	11	CEUX
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	2	AQEU
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	1	AQEU
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	10	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	9:43:34 AM	1,800.5000	2	AQEU
Genmab A/S	18/06/2024	9:44:31 AM	1,800.5000	36	XCSE
Genmab A/S	18/06/2024	9:44:50 AM	1,800.5000	34	XCSE
Genmab A/S	18/06/2024	9:44:50 AM	1,800.5000	20	XCSE
Genmab A/S	18/06/2024	9:44:50 AM	1,800.5000	26	XCSE
Genmab A/S	18/06/2024	9:44:50 AM	1,800.5000	23	XCSE
Genmab A/S	18/06/2024	9:44:50 AM	1,800.5000	10	TQEX
Genmab A/S	18/06/2024	9:44:50 AM	1,800.5000	36	CEUX
Genmab A/S	18/06/2024	9:44:58 AM	1,800.5000	9	XCSE
Genmab A/S	18/06/2024	9:44:59 AM	1,800.5000	9	CEUX
Genmab A/S	18/06/2024	9:45:10 AM	1,800.0000	5	CEUX
Genmab A/S	18/06/2024	9:45:10 AM	1,800.0000	108	CEUX
Genmab A/S	18/06/2024	9:45:10 AM	1,800.0000	16	AQEU
Genmab A/S	18/06/2024	9:45:10 AM	1,800.0000	18	TQEX
Genmab A/S	18/06/2024	9:45:10 AM	1,800.0000	127	XCSE
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	31	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	12	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	31	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	6	AQEU
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	7	TQEX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	43	XCSE
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	5	XCSE

81

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	5	XCSE
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	27	XCSE
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	30	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	13	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	43	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	1	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	6	AQEU
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	7	TQEX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	7	TQEX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	9	CEUX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	6	AQEU
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	5	TQEX
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	104	XCSE
Genmab A/S	18/06/2024	9:46:10 AM	1,801.0000	50	XCSE
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	50	XCSE
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	9	XCSE
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	30	XCSE
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	29	XCSE
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	30	XCSE
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	30	XCSE
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	53	CEUX
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	20	CEUX
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	53	CEUX
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	35	CEUX
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	8	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	8	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	8	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	6	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	6	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	9:49:01 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	9:50:54 AM	1,799.0000	8	XCSE
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	XCSE
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	5	XCSE
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	5	TQEX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	7	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	4	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	1	AQEU
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	5	TQEX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	5	TQEX

82

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	5	TQEX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	XCSE
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	8	XCSE
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	4	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	54	XCSE
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	34	XCSE
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	22	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	16	CEUX
Genmab A/S	18/06/2024	9:51:57 AM	1,799.0000	2	AQEU
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	20	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	20	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	4	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	17	XCSE
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	4	XCSE
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	4	XCSE
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	17	XCSE
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	17	XCSE
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	6	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	5	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	4	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	4	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	1	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	13	CEUX
Genmab A/S	18/06/2024	9:52:55 AM	1,801.5000	21	XCSE
Genmab A/S	18/06/2024	9:54:11 AM	1,800.5000	7	CEUX
Genmab A/S	18/06/2024	9:54:29 AM	1,800.5000	10	CEUX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	15	CEUX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	8	CEUX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	6	TQEX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	6	TQEX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	1	TQEX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	6	TQEX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	44	XCSE
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	40	CEUX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	6	TQEX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	6	TQEX
Genmab A/S	18/06/2024	9:54:56 AM	1,800.5000	6	TQEX
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	10	XCSE
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	14	XCSE
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	20	XCSE
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	3	XCSE
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	4	CEUX
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	AQEU
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	AQEU
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	AQEU
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	AQEU
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	AQEU

83

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	AQEU
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	AQEU
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	2	AQEU
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	6	TQEX
Genmab A/S	18/06/2024	9:54:58 AM	1,800.5000	3	TQEX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	XCSE
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	39	XCSE
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	41	CEUX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	19	CEUX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	2	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	4	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	2	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	2	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	2	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	4	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	2	AQEU
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	TQEX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	TQEX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	TQEX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	6	TQEX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	3	TQEX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	3	TQEX
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	7	XCSE
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	14	XCSE
Genmab A/S	18/06/2024	9:55:51 AM	1,800.0000	18	CEUX
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	52	XCSE
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	48	CEUX
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	29	CEUX
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	4	AQEU
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	3	AQEU
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	2	AQEU
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	7	AQEU
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	24	AQEU
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	2	AQEU
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	7	TQEX
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	7	TQEX
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	25	TQEX
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	7	TQEX
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	13	XCSE
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	19	XCSE
Genmab A/S	18/06/2024	9:57:27 AM	1,801.0000	2	XCSE
Genmab A/S	18/06/2024	9:58:30 AM	1,800.0000	3	XCSE
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	33	XCSE
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	36	XCSE
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	32	CEUX

84

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	5	AQEU
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	5	AQEU
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	32	CEUX
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	26	CEUX
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	5	AQEU
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	5	TQEX
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	5	TQEX
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	9	TQEX
Genmab A/S	18/06/2024	9:58:56 AM	1,800.0000	30	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	29	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	15	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	44	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	10	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	7	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	7	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	7	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	4	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	3	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	4	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	3	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	4	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	3	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	2	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	6	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	2	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	4	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	2	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	6	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	17	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	49	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	56	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	17	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	49	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	17	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	17	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	9	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	17	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	2	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,798.5000	9	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	17	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	17	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	17	CEUX
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	2	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	1	AQEU
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	39	XCSE
Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	41	XCSE

85

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:00:03 AM	1,797.5000	22	XCSE
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	23	XCSE
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	23	XCSE
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	30	XCSE
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	23	XCSE
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	21	CEUX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	21	CEUX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	21	CEUX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	21	CEUX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	15	CEUX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	3	AQEU
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	3	AQEU
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	10	AQEU
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	2	AQEU
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	5	TQEX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	23	TQEX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	5	TQEX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	8	TQEX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	5	TQEX
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	10	AQEU
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	7	XCSE
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	2	XCSE
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	10	AQEU
Genmab A/S	18/06/2024	10:00:04 AM	1,797.0000	6	TQEX
Genmab A/S	18/06/2024	10:05:29 AM	1,795.0000	61	XCSE
Genmab A/S	18/06/2024	10:05:29 AM	1,795.0000	61	XCSE
Genmab A/S	18/06/2024	10:05:29 AM	1,795.0000	11	TQEX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	44	XCSE
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	30	XCSE
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	8	CEUX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	32	CEUX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	19	CEUX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	9	CEUX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	2	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	4	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	2	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	TQEX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	TQEX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	TQEX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	TQEX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	12	AQEU
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	6	TQEX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	2	TQEX

86

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	1	TQEX
Genmab A/S	18/06/2024	10:06:45 AM	1,795.0000	1	TQEX
Genmab A/S	18/06/2024	10:06:46 AM	1,794.0000	8	CEUX
Genmab A/S	18/06/2024	10:06:46 AM	1,794.0000	18	XCSE
Genmab A/S	18/06/2024	10:06:47 AM	1,794.0000	18	XCSE
Genmab A/S	18/06/2024	10:06:47 AM	1,794.0000	18	XCSE
Genmab A/S	18/06/2024	10:06:47 AM	1,794.0000	9	CEUX
Genmab A/S	18/06/2024	10:06:47 AM	1,794.0000	5	TQEX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	11	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	11	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	11	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	3	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	11	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	3	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	11	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	11	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	7	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	12	XCSE
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	51	XCSE
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	12	XCSE
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	13	XCSE
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	13	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	50	CEUX
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	10	XCSE
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	100	XCSE
Genmab A/S	18/06/2024	10:09:42 AM	1,795.5000	4	CEUX
Genmab A/S	18/06/2024	10:09:43 AM	1,795.5000	32	CEUX
Genmab A/S	18/06/2024	10:11:21 AM	1,795.0000	76	CEUX
Genmab A/S	18/06/2024	10:11:21 AM	1,795.0000	11	AQEU
Genmab A/S	18/06/2024	10:11:21 AM	1,795.0000	12	TQEX
Genmab A/S	18/06/2024	10:11:21 AM	1,795.0000	14	XCSE
Genmab A/S	18/06/2024	10:11:21 AM	1,795.0000	45	XCSE
Genmab A/S	18/06/2024	10:11:21 AM	1,795.0000	26	XCSE
Genmab A/S	18/06/2024	10:13:44 AM	1,794.0000	12	CEUX
Genmab A/S	18/06/2024	10:13:44 AM	1,794.0000	64	CEUX
Genmab A/S	18/06/2024	10:13:44 AM	1,794.0000	10	TQEX
Genmab A/S	18/06/2024	10:13:44 AM	1,794.0000	2	TQEX
Genmab A/S	18/06/2024	10:13:44 AM	1,794.0000	65	XCSE
Genmab A/S	18/06/2024	10:13:44 AM	1,794.0000	14	XCSE
Genmab A/S	18/06/2024	10:13:44 AM	1,794.0000	5	XCSE
Genmab A/S	18/06/2024	10:13:51 AM	1,794.0000	76	XCSE
Genmab A/S	18/06/2024	10:13:51 AM	1,794.0000	35	CEUX
Genmab A/S	18/06/2024	10:13:51 AM	1,794.0000	11	AQEU
Genmab A/S	18/06/2024	10:13:51 AM	1,794.0000	1	AQEU
Genmab A/S	18/06/2024	10:15:01 AM	1,794.0000	87	XCSE
Genmab A/S	18/06/2024	10:15:02 AM	1,794.0000	46	XCSE
Genmab A/S	18/06/2024	10:15:02 AM	1,794.0000	43	XCSE
Genmab A/S	18/06/2024	10:15:02 AM	1,794.0000	12	XCSE
Genmab A/S	18/06/2024	10:17:09 AM	1,794.5000	60	XCSE

87

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:17:09 AM	1,794.5000	147	XCSE
Genmab A/S	18/06/2024	10:17:09 AM	1,794.5000	15	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.5000	27	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.5000	91	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.5000	17	AQEU
Genmab A/S	18/06/2024	10:17:59 AM	1,794.5000	18	TQEX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.5000	132	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	17	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	17	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	17	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	17	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	5	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	1	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	11	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	17	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	15	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	17	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	11	CEUX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	2	AQEU
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	2	AQEU
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	5	TQEX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	5	TQEX
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	5	TQEX
Genmab A/S	18/06/2024	10:17:59 AM	1,793.5000	18	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	15	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	41	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	18	XCSE
Genmab A/S	18/06/2024	10:17:59 AM	1,794.0000	12	XCSE
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	5	CEUX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	2	CEUX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	6	TQEX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	10:23:58 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	15	XCSE
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	1	CEUX
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	1	AQEU
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	5	TQEX

88

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	10:24:20 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:24:54 AM	1,795.0000	8	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	6	XCSE
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	2	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	3	XCSE
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	5	TQEX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	1	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	1	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	4	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	9	XCSE
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	3	XCSE
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	3	XCSE
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	10	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	8	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	9	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	9	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	2	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	12	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	2	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	12	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	9	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	20	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	4	CEUX
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	8	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	17	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	12	AQEU
Genmab A/S	18/06/2024	10:25:00 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	8	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	1	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	4	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	7	CEUX

89

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	9	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	6	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	1	AQEU
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	1	TQEX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	4	TQEX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	21	TQEX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	2	TQEX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	3	TQEX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	15	TQEX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	1	XCSE
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	7	XCSE
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	8	XCSE
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	34	XCSE
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	7	XCSE
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	1	XCSE
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	28	XCSE
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	36	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	5	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	7	CEUX
Genmab A/S	18/06/2024	10:26:16 AM	1,793.0000	14	CEUX
Genmab A/S	18/06/2024	10:28:59 AM	1,793.0000	5	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	CEUX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	CEUX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	5	TQEX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	5	TQEX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	7	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	7	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	7	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	7	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	CEUX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	CEUX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	3	CEUX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	1	AQEU
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	1	AQEU
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	5	TQEX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	5	TQEX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	CEUX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	7	CEUX
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	7	XCSE
Genmab A/S	18/06/2024	10:29:48 AM	1,793.5000	8	XCSE
Genmab A/S	18/06/2024	10:30:47 AM	1,793.0000	8	XCSE
Genmab A/S	18/06/2024	10:31:44 AM	1,794.0000	25	XCSE
Genmab A/S	18/06/2024	10:32:36 AM	1,794.5000	12	CEUX
Genmab A/S	18/06/2024	10:32:36 AM	1,794.5000	10	AQEU
Genmab A/S	18/06/2024	10:32:36 AM	1,794.5000	10	TQEX

90

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:32:36 AM	1,794.5000	10	XCSE
Genmab A/S	18/06/2024	10:32:36 AM	1,794.5000	54	XCSE
Genmab A/S	18/06/2024	10:32:36 AM	1,794.5000	23	XCSE
Genmab A/S	18/06/2024	10:32:37 AM	1,794.5000	80	XCSE
Genmab A/S	18/06/2024	10:33:11 AM	1,795.0000	22	CEUX
Genmab A/S	18/06/2024	10:33:11 AM	1,795.0000	13	CEUX
Genmab A/S	18/06/2024	10:33:11 AM	1,795.0000	34	CEUX
Genmab A/S	18/06/2024	10:33:11 AM	1,795.0000	1	CEUX
Genmab A/S	18/06/2024	10:33:11 AM	1,795.0000	6	AQEU
Genmab A/S	18/06/2024	10:33:28 AM	1,795.0000	16	CEUX
Genmab A/S	18/06/2024	10:33:28 AM	1,795.0000	13	CEUX
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	4	XCSE
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	1	CEUX
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	36	CEUX
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	6	AQEU
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	5	TQEX
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	33	XCSE
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	41	XCSE
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	37	CEUX
Genmab A/S	18/06/2024	10:33:42 AM	1,794.5000	5	TQEX
Genmab A/S	18/06/2024	10:33:43 AM	1,794.0000	10	CEUX
Genmab A/S	18/06/2024	10:34:59 AM	1,795.5000	9	XCSE
Genmab A/S	18/06/2024	10:34:59 AM	1,795.5000	9	CEUX
Genmab A/S	18/06/2024	10:34:59 AM	1,795.5000	5	TQEX
Genmab A/S	18/06/2024	10:35:58 AM	1,796.5000	3	XCSE
Genmab A/S	18/06/2024	10:37:43 AM	1,797.5000	18	CEUX
Genmab A/S	18/06/2024	10:37:43 AM	1,797.5000	3	CEUX
Genmab A/S	18/06/2024	10:37:43 AM	1,797.5000	3	CEUX
Genmab A/S	18/06/2024	10:37:43 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	3	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	6	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	3	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	6	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	2	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	9	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	1	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE

91

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	23	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	30	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	8	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	3	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	1	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	8	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX

92

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	1	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	1	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	CEUX
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	12	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	11	XCSE
Genmab A/S	18/06/2024	10:39:46 AM	1,798.0000	42	XCSE
Genmab A/S	18/06/2024	10:42:23 AM	1,797.0000	24	XCSE
Genmab A/S	18/06/2024	10:43:28 AM	1,798.0000	39	XCSE
Genmab A/S	18/06/2024	10:43:58 AM	1,798.0000	35	XCSE
Genmab A/S	18/06/2024	10:43:58 AM	1,798.0000	80	XCSE
Genmab A/S	18/06/2024	10:43:58 AM	1,798.0000	24	XCSE
Genmab A/S	18/06/2024	10:43:58 AM	1,798.0000	56	XCSE
Genmab A/S	18/06/2024	10:43:58 AM	1,798.0000	24	XCSE
Genmab A/S	18/06/2024	10:43:58 AM	1,798.0000	17	CEUX
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	56	XCSE
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	15	XCSE
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	5	XCSE
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	55	CEUX
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	28	CEUX
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	72	CEUX
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	10	CEUX
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	13	CEUX
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	40	CEUX
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	10	AQEU
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	10	AQEU
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	10	AQEU
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	10	AQEU
Genmab A/S	18/06/2024	10:45:04 AM	1,798.0000	4	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	XCSE
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	XCSE
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	61	XCSE

93

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	8	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	1	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	1	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	13	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	13	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	1	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	5	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	3	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	20	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	5	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	1	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	5	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	4	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	1	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	5	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	19	CEUX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	5	TQEX
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	9	AQEU
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	22	XCSE
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	22	XCSE
Genmab A/S	18/06/2024	10:46:44 AM	1,797.0000	22	XCSE
Genmab A/S	18/06/2024	10:46:44 AM	1,797.5000	5	XCSE
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	1	CEUX
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	3	TQEX
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	20	CEUX
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	3	AQEU
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	2	TQEX
Genmab A/S	18/06/2024	10:46:45 AM	1,796.5000	12	XCSE
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	17	XCSE
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	44	CEUX
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	6	CEUX
Genmab A/S	18/06/2024	10:46:45 AM	1,797.0000	29	CEUX
Genmab A/S	18/06/2024	10:46:45 AM	1,796.5000	14	XCSE
Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	11	XCSE
Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	18	XCSE
Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	26	CEUX
Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	26	CEUX

94

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	26	CEUX
Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	14	CEUX
Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	29	XCSE
Genmab A/S	18/06/2024	10:51:43 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	10:53:43 AM	1,802.0000	35	CEUX
Genmab A/S	18/06/2024	10:53:59 AM	1,802.0000	33	CEUX
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	72	XCSE
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	43	CEUX
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	22	CEUX
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	36	CEUX
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	7	CEUX
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	3	TQEX
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	31	XCSE
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	41	XCSE
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	22	XCSE
Genmab A/S	18/06/2024	10:53:59 AM	1,801.5000	10	CEUX
Genmab A/S	18/06/2024	10:55:42 AM	1,801.5000	57	XCSE
Genmab A/S	18/06/2024	10:55:42 AM	1,801.5000	51	CEUX
Genmab A/S	18/06/2024	10:55:42 AM	1,801.5000	7	TQEX
Genmab A/S	18/06/2024	10:55:42 AM	1,801.5000	8	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	48	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	11	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	11	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	11	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	11	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	11	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	5	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	3	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	1	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	27	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	5	TQEX
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	16	TQEX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	18	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	14	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	5	TQEX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	18	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	18	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	18	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,799.0000	1	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	14	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,800.0000	27	XCSE
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	3	TQEX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	2	TQEX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	3	TQEX

95

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	4	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	29	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	15	CEUX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	5	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	5	AQEU
Genmab A/S	18/06/2024	10:56:27 AM	1,799.5000	5	TQEX
Genmab A/S	18/06/2024	10:56:27 AM	1,799.0000	18	XCSE
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	39	CEUX
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	7	CEUX
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	7	AQEU
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	2	AQEU
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	7	TQEX
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	10	XCSE
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	41	XCSE
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	39	XCSE
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	4	CEUX
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	7	AQEU
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	5	AQEU
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	3	CEUX
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	7	TQEX
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	29	CEUX
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	7	AQEU
Genmab A/S	18/06/2024	10:59:04 AM	1,798.0000	1	XCSE
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	18	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	30	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	3	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	27	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	4	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	14	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	29	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	8	TQEX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	4	TQEX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	4	TQEX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	8	TQEX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	10	TQEX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	8	TQEX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	4	TQEX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	53	XCSE
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	19	XCSE
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	15	XCSE
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	4	XCSE
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	15	XCSE
Genmab A/S	18/06/2024	11:02:11 AM	1,798.5000	31	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.0000	4	AQEU
Genmab A/S	18/06/2024	11:02:11 AM	1,798.0000	40	CEUX
Genmab A/S	18/06/2024	11:02:11 AM	1,798.0000	2	AQEU
Genmab A/S	18/06/2024	11:02:11 AM	1,798.0000	2	AQEU
Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	8	CEUX

96

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	1	AQEU
Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	5	TQEX
Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	8	XCSE
Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	57	XCSE
Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	8	CEUX
Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	1	CEUX
Genmab A/S	18/06/2024	11:03:58 AM	1,799.0000	5	TQEX
Genmab A/S	18/06/2024	11:06:35 AM	1,801.5000	3	CEUX
Genmab A/S	18/06/2024	11:06:35 AM	1,801.5000	8	CEUX
Genmab A/S	18/06/2024	11:06:35 AM	1,801.5000	20	CEUX
Genmab A/S	18/06/2024	11:06:35 AM	1,801.5000	8	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	9	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	9	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:06:53 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	14	CEUX
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	3	CEUX
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	1	CEUX
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	16	CEUX
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:07:49 AM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	17	CEUX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	4	CEUX

97

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	6	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	13	CEUX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	17	CEUX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	17	CEUX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	17	CEUX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	3	CEUX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	9	AQEU
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	1	XCSE
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	42	CEUX
Genmab A/S	18/06/2024	11:07:50 AM	1,803.5000	6	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	XCSE
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	XCSE
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	XCSE
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	1	XCSE
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	7	XCSE
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	XCSE
Genmab A/S	18/06/2024	11:10:45 AM	1,804.5000	8	XCSE
Genmab A/S	18/06/2024	11:11:04 AM	1,803.5000	49	XCSE
Genmab A/S	18/06/2024	11:11:04 AM	1,803.5000	49	XCSE
Genmab A/S	18/06/2024	11:11:04 AM	1,803.5000	38	XCSE
Genmab A/S	18/06/2024	11:11:04 AM	1,803.5000	11	XCSE
Genmab A/S	18/06/2024	11:11:04 AM	1,803.5000	5	XCSE
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	38	CEUX
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	15	CEUX
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	12	CEUX
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	6	AQEU
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	8	AQEU
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	6	TQEX
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	9	TQEX

98

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	6	TQEX
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	42	XCSE
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	4	XCSE
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	23	XCSE
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	15	CEUX
Genmab A/S	18/06/2024	11:12:55 AM	1,803.5000	40	CEUX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	14	XCSE
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	14	CEUX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	14	CEUX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	8	CEUX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	1	AQEU
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	14	CEUX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	14	XCSE
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	25	XCSE
Genmab A/S	18/06/2024	11:16:00 AM	1,803.5000	14	XCSE
Genmab A/S	18/06/2024	11:16:06 AM	1,803.0000	50	XCSE
Genmab A/S	18/06/2024	11:16:07 AM	1,803.0000	33	XCSE
Genmab A/S	18/06/2024	11:17:51 AM	1,802.5000	5	XCSE
Genmab A/S	18/06/2024	11:17:51 AM	1,802.5000	3	XCSE
Genmab A/S	18/06/2024	11:17:51 AM	1,802.5000	9	CEUX
Genmab A/S	18/06/2024	11:17:51 AM	1,802.5000	9	CEUX
Genmab A/S	18/06/2024	11:17:51 AM	1,802.5000	5	TQEX
Genmab A/S	18/06/2024	11:18:50 AM	1,803.0000	3	AQEU
Genmab A/S	18/06/2024	11:19:03 AM	1,803.0000	31	XCSE
Genmab A/S	18/06/2024	11:19:03 AM	1,803.0000	93	XCSE
Genmab A/S	18/06/2024	11:20:00 AM	1,804.0000	14	XCSE
Genmab A/S	18/06/2024	11:20:00 AM	1,804.0000	7	XCSE
Genmab A/S	18/06/2024	11:20:00 AM	1,804.0000	8	XCSE
Genmab A/S	18/06/2024	11:20:00 AM	1,804.0000	5	XCSE
Genmab A/S	18/06/2024	11:20:16 AM	1,804.0000	38	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	31	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	14	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	17	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	17	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	13	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	16	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	29	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	21	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	29	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	29	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	29	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	10	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	19	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	19	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	10	CEUX

99

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	2	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	27	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	2	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	4	AQEU
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	4	AQEU
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	4	AQEU
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	7	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	7	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	25	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	6	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	7	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	17	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	7	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	27	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	4	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	29	CEUX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	4	AQEU
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	1	TQEX
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	13	XCSE
Genmab A/S	18/06/2024	11:21:00 AM	1,803.0000	35	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	15	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	5	TQEX
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	6	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	21	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	20	CEUX
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	2	AQEU
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	6	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	4	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	5	TQEX
Genmab A/S	18/06/2024	11:23:50 AM	1,801.5000	5	TQEX
Genmab A/S	18/06/2024	11:25:05 AM	1,801.0000	62	CEUX
Genmab A/S	18/06/2024	11:25:05 AM	1,801.0000	6	AQEU
Genmab A/S	18/06/2024	11:25:05 AM	1,801.0000	3	AQEU
Genmab A/S	18/06/2024	11:25:05 AM	1,801.0000	9	TQEX
Genmab A/S	18/06/2024	11:25:05 AM	1,801.0000	37	XCSE
Genmab A/S	18/06/2024	11:25:05 AM	1,801.0000	31	XCSE
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	2	AQEU
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	3	TQEX

100

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	7	XCSE
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	14	XCSE
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	20	CEUX
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	2	AQEU
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	2	TQEX
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	11	XCSE
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	20	CEUX
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	2	AQEU
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:25:05 AM	1,800.5000	1	XCSE
Genmab A/S	18/06/2024	11:29:05 AM	1,800.0000	41	CEUX
Genmab A/S	18/06/2024	11:29:53 AM	1,800.5000	70	XCSE
Genmab A/S	18/06/2024	11:29:53 AM	1,800.0000	18	CEUX
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	57	XCSE
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	7	CEUX
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	45	CEUX
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	51	CEUX
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	8	AQEU
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	8	TQEX
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	57	XCSE
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	30	XCSE
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	13	CEUX
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	8	AQEU
Genmab A/S	18/06/2024	11:30:09 AM	1,800.0000	3	CEUX
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	10	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	60	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	11	CEUX
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	11	CEUX
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	11	CEUX
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	6	CEUX
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	5	TQEX
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	15	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	12	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	3	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	15	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	9	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	24	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	27	XCSE
Genmab A/S	18/06/2024	11:31:44 AM	1,799.5000	6	XCSE
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	17	CEUX
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	17	CEUX
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	8	CEUX
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	2	CEUX
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	5	TQEX
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	18	XCSE
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	15	CEUX
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	2	AQEU
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	2	TQEX
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	17	CEUX

101

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	1	AQEU
Genmab A/S	18/06/2024	11:34:15 AM	1,798.5000	17	CEUX
Genmab A/S	18/06/2024	11:34:16 AM	1,798.5000	10	CEUX
Genmab A/S	18/06/2024	11:34:16 AM	1,798.5000	3	CEUX
Genmab A/S	18/06/2024	11:36:27 AM	1,800.0000	1	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	41	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	15	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	5	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	7	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	50	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	6	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	12	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	5	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	22	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	10	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	10	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	40	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	19	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	33	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	13	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	19	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	65	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	62	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	3	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	32	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	23	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	3	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	3	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	5	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	14	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	12	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	18	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	6	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	5	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	13	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	11	CEUX
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	11:37:29 AM	1,800.0000	15	XCSE
Genmab A/S	18/06/2024	11:40:12 AM	1,799.5000	12	AQEU
Genmab A/S	18/06/2024	11:40:23 AM	1,799.0000	2	AQEU
Genmab A/S	18/06/2024	11:40:23 AM	1,799.0000	25	AQEU
Genmab A/S	18/06/2024	11:40:23 AM	1,799.0000	18	CEUX
Genmab A/S	18/06/2024	11:40:23 AM	1,799.0000	5	TQEX
Genmab A/S	18/06/2024	11:41:34 AM	1,798.5000	25	XCSE
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	12	CEUX

102

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	43	CEUX
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	61	XCSE
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	61	XCSE
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	18	XCSE
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	47	XCSE
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	21	CEUX
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	21	CEUX
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	13	CEUX
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	19	CEUX
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	18	CEUX
Genmab A/S	18/06/2024	11:42:49 AM	1,800.0000	19	CEUX
Genmab A/S	18/06/2024	11:42:50 AM	1,800.0000	2	CEUX
Genmab A/S	18/06/2024	11:46:40 AM	1,800.0000	10	CEUX
Genmab A/S	18/06/2024	11:46:40 AM	1,800.0000	5	AQEU
Genmab A/S	18/06/2024	11:46:40 AM	1,800.0000	10	AQEU
Genmab A/S	18/06/2024	11:46:40 AM	1,800.0000	4	TQEX
Genmab A/S	18/06/2024	11:46:40 AM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	7	XCSE
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	79	XCSE
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	8	CEUX
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	8	CEUX
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	2	CEUX
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	1	AQEU
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	5	TQEX
Genmab A/S	18/06/2024	11:47:23 AM	1,800.0000	5	TQEX
Genmab A/S	18/06/2024	11:48:11 AM	1,800.0000	38	XCSE
Genmab A/S	18/06/2024	11:48:11 AM	1,799.5000	6	AQEU
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	47	XCSE
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	37	XCSE
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	6	AQEU
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	7	TQEX
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	43	CEUX
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	7	TQEX
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	27	XCSE
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	24	XCSE
Genmab A/S	18/06/2024	11:48:35 AM	1,799.5000	19	XCSE
Genmab A/S	18/06/2024	11:48:36 AM	1,799.5000	29	XCSE
Genmab A/S	18/06/2024	11:52:04 AM	1,799.0000	1	AQEU
Genmab A/S	18/06/2024	11:52:04 AM	1,799.0000	1	AQEU
Genmab A/S	18/06/2024	11:52:05 AM	1,799.0000	6	CEUX
Genmab A/S	18/06/2024	11:52:05 AM	1,799.0000	1	AQEU
Genmab A/S	18/06/2024	11:52:10 AM	1,800.0000	4	AQEU
Genmab A/S	18/06/2024	11:52:10 AM	1,800.0000	8	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX

103

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	9	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	1	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	1	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	3	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	9	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	2	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	9	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	10	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	2	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	10	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	2	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	10	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	2	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	10	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	4	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	4	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	10	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	2	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	1	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	15	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX

104

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	4	XCSE
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	24	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,801.5000	14	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,800.5000	20	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,800.5000	3	AQEU
Genmab A/S	18/06/2024	11:52:47 AM	1,800.5000	5	TQEX
Genmab A/S	18/06/2024	11:52:47 AM	1,800.5000	6	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,800.5000	14	CEUX
Genmab A/S	18/06/2024	11:52:47 AM	1,800.5000	3	AQEU
Genmab A/S	18/06/2024	11:52:47 AM	1,800.5000	3	TQEX
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	24	XCSE
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	21	XCSE
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	23	CEUX
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	21	CEUX
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	5	TQEX
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	3	TQEX
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	37	XCSE
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	18	XCSE
Genmab A/S	18/06/2024	11:56:36 AM	1,802.5000	27	XCSE
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	3	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	3	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	20	CEUX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	5	CEUX

105

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	10	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	1	TQEX
Genmab A/S	18/06/2024	11:59:24 AM	1,804.0000	24	XCSE
Genmab A/S	18/06/2024	11:59:49 AM	1,804.0000	16	XCSE
Genmab A/S	18/06/2024	12:01:20 PM	1,806.5000	6	XCSE
Genmab A/S	18/06/2024	12:01:20 PM	1,806.5000	19	XCSE
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	23	CEUX
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	2	CEUX
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	11	XCSE
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	14	XCSE
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	21	CEUX
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	12	CEUX
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	18	CEUX
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	25	XCSE
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	9	XCSE
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	28	XCSE
Genmab A/S	18/06/2024	12:01:27 PM	1,806.5000	16	XCSE
Genmab A/S	18/06/2024	12:01:37 PM	1,805.0000	23	CEUX
Genmab A/S	18/06/2024	12:02:37 PM	1,805.0000	95	CEUX
Genmab A/S	18/06/2024	12:02:37 PM	1,805.0000	105	XCSE
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	19	XCSE
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	19	XCSE
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	11	CEUX
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	4	CEUX
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	4	CEUX
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	19	CEUX
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	2	AQEU
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	19	XCSE
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	5	XCSE
Genmab A/S	18/06/2024	12:02:37 PM	1,804.0000	16	CEUX
Genmab A/S	18/06/2024	12:02:38 PM	1,804.0000	45	TQEX
Genmab A/S	18/06/2024	12:05:47 PM	1,803.5000	28	XCSE
Genmab A/S	18/06/2024	12:05:47 PM	1,803.5000	50	XCSE
Genmab A/S	18/06/2024	12:05:47 PM	1,803.5000	13	XCSE
Genmab A/S	18/06/2024	12:05:47 PM	1,803.5000	82	CEUX
Genmab A/S	18/06/2024	12:05:47 PM	1,803.5000	12	AQEU
Genmab A/S	18/06/2024	12:05:47 PM	1,803.5000	13	TQEX
Genmab A/S	18/06/2024	12:05:48 PM	1,803.0000	1	AQEU
Genmab A/S	18/06/2024	12:07:10 PM	1,802.0000	18	CEUX
Genmab A/S	18/06/2024	12:07:10 PM	1,802.0000	4	CEUX
Genmab A/S	18/06/2024	12:07:10 PM	1,802.0000	5	TQEX
Genmab A/S	18/06/2024	12:07:10 PM	1,802.0000	21	XCSE
Genmab A/S	18/06/2024	12:07:10 PM	1,802.0000	2	XCSE
Genmab A/S	18/06/2024	12:07:10 PM	1,802.0000	19	CEUX
Genmab A/S	18/06/2024	12:07:14 PM	1,802.0000	16	XCSE
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	33	CEUX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	13	CEUX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	87	CEUX

106

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	16	TQEX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	5	CEUX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	16	CEUX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	1	TQEX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	9	TQEX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	36	CEUX
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	24	XCSE
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	12:10:57 PM	1,803.5000	2	XCSE
Genmab A/S	18/06/2024	12:13:30 PM	1,803.0000	5	CEUX
Genmab A/S	18/06/2024	12:13:30 PM	1,803.0000	14	TQEX
Genmab A/S	18/06/2024	12:13:51 PM	1,803.0000	35	CEUX
Genmab A/S	18/06/2024	12:14:20 PM	1,803.5000	11	TQEX
Genmab A/S	18/06/2024	12:14:29 PM	1,803.5000	8	TQEX
Genmab A/S	18/06/2024	12:14:29 PM	1,803.5000	3	TQEX
Genmab A/S	18/06/2024	12:14:35 PM	1,803.5000	6	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	19	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	24	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	39	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	14	CEUX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	37	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	3	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	3	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	3	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	5	TQEX

107

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	19	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	24	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	24	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	19	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	24	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	13	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	24	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	15	XCSE
Genmab A/S	18/06/2024	12:15:19 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:17:17 PM	1,804.0000	20	CEUX
Genmab A/S	18/06/2024	12:17:17 PM	1,804.0000	2	AQEU
Genmab A/S	18/06/2024	12:17:17 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	12:17:17 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	12:17:17 PM	1,804.0000	13	XCSE
Genmab A/S	18/06/2024	12:17:17 PM	1,804.0000	20	XCSE
Genmab A/S	18/06/2024	12:20:05 PM	1,804.0000	39	CEUX
Genmab A/S	18/06/2024	12:20:09 PM	1,803.5000	18	CEUX
Genmab A/S	18/06/2024	12:20:09 PM	1,803.5000	37	CEUX
Genmab A/S	18/06/2024	12:20:09 PM	1,803.5000	8	TQEX
Genmab A/S	18/06/2024	12:20:09 PM	1,803.5000	60	XCSE
Genmab A/S	18/06/2024	12:20:43 PM	1,803.5000	1	AQEU
Genmab A/S	18/06/2024	12:21:21 PM	1,803.5000	20	CEUX
Genmab A/S	18/06/2024	12:21:21 PM	1,803.5000	60	XCSE
Genmab A/S	18/06/2024	12:21:21 PM	1,803.5000	39	XCSE
Genmab A/S	18/06/2024	12:21:21 PM	1,803.5000	3	CEUX
Genmab A/S	18/06/2024	12:21:21 PM	1,803.5000	20	XCSE
Genmab A/S	18/06/2024	12:21:21 PM	1,803.5000	111	XCSE
Genmab A/S	18/06/2024	12:21:21 PM	1,803.5000	17	XCSE
Genmab A/S	18/06/2024	12:23:23 PM	1,803.5000	16	CEUX
Genmab A/S	18/06/2024	12:23:23 PM	1,803.5000	11	CEUX
Genmab A/S	18/06/2024	12:23:23 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:23:23 PM	1,803.5000	19	CEUX
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	25	XCSE
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	6	XCSE
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	11	XCSE
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	4	TQEX
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	8	CEUX
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	10	CEUX
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	4	AQEU
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	11	AQEU
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	20	XCSE
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	6	XCSE
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	1	TQEX
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	2	TQEX
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	50	XCSE
Genmab A/S	18/06/2024	12:23:38 PM	1,803.5000	8	XCSE

108

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	12:27:02 PM	1,804.0000	5	XCSE
Genmab A/S	18/06/2024	12:27:02 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	12:27:02 PM	1,804.0000	14	XCSE
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	40	CEUX
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	40	CEUX
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	36	CEUX
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	39	XCSE
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	44	XCSE
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	80	XCSE
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	44	XCSE
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	6	XCSE
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	44	XCSE
Genmab A/S	18/06/2024	12:27:45 PM	1,804.0000	2	XCSE
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	8	XCSE
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	8	XCSE
Genmab A/S	18/06/2024	12:32:58 PM	1,804.0000	1	TQEX
Genmab A/S	18/06/2024	12:32:58 PM	1,804.0000	9	TQEX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	9	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	9	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	9	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	9	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	2	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	9	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	9	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	22	CEUX
Genmab A/S	18/06/2024	12:32:58 PM	1,803.5000	16	CEUX
Genmab A/S	18/06/2024	12:33:03 PM	1,803.5000	22	CEUX
Genmab A/S	18/06/2024	12:33:03 PM	1,803.5000	12	XCSE
Genmab A/S	18/06/2024	12:33:10 PM	1,803.5000	3	XCSE
Genmab A/S	18/06/2024	12:33:10 PM	1,803.5000	13	XCSE
Genmab A/S	18/06/2024	12:33:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	12:33:16 PM	1,804.0000	29	XCSE
Genmab A/S	18/06/2024	12:33:43 PM	1,804.0000	19	XCSE
Genmab A/S	18/06/2024	12:33:43 PM	1,804.0000	15	XCSE
Genmab A/S	18/06/2024	12:33:43 PM	1,804.0000	3	XCSE
Genmab A/S	18/06/2024	12:34:06 PM	1,804.0000	35	XCSE
Genmab A/S	18/06/2024	12:34:07 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	12:34:34 PM	1,803.5000	3	XCSE
Genmab A/S	18/06/2024	12:34:34 PM	1,804.0000	35	CEUX
Genmab A/S	18/06/2024	12:34:35 PM	1,803.5000	4	AQEU
Genmab A/S	18/06/2024	12:34:35 PM	1,803.5000	3	AQEU
Genmab A/S	18/06/2024	12:34:35 PM	1,803.5000	15	XCSE
Genmab A/S	18/06/2024	12:34:35 PM	1,803.5000	27	XCSE
Genmab A/S	18/06/2024	12:34:35 PM	1,803.5000	28	XCSE
Genmab A/S	18/06/2024	12:34:36 PM	1,803.5000	2	AQEU

109

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	12:34:43 PM	1,803.5000	7	XCSE
Genmab A/S	18/06/2024	12:35:48 PM	1,803.0000	92	XCSE
Genmab A/S	18/06/2024	12:35:48 PM	1,803.0000	40	XCSE
Genmab A/S	18/06/2024	12:35:48 PM	1,803.0000	17	XCSE
Genmab A/S	18/06/2024	12:36:48 PM	1,802.0000	2	XCSE
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	19	CEUX
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	19	CEUX
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	5	CEUX
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	2	AQEU
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	2	AQEU
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	17	XCSE
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	12	XCSE
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	5	TQEX
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	4	TQEX
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	3	CEUX
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	2	AQEU
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	19	XCSE
Genmab A/S	18/06/2024	12:36:49 PM	1,802.0000	5	TQEX
Genmab A/S	18/06/2024	12:38:08 PM	1,800.5000	42	XCSE
Genmab A/S	18/06/2024	12:38:08 PM	1,800.5000	43	XCSE
Genmab A/S	18/06/2024	12:38:08 PM	1,800.5000	42	XCSE
Genmab A/S	18/06/2024	12:38:08 PM	1,800.5000	14	XCSE
Genmab A/S	18/06/2024	12:38:08 PM	1,800.5000	28	XCSE
Genmab A/S	18/06/2024	12:38:08 PM	1,800.5000	7	XCSE
Genmab A/S	18/06/2024	12:39:51 PM	1,801.5000	9	XCSE
Genmab A/S	18/06/2024	12:39:51 PM	1,801.5000	37	XCSE
Genmab A/S	18/06/2024	12:39:51 PM	1,801.5000	9	CEUX
Genmab A/S	18/06/2024	12:39:51 PM	1,801.5000	5	TQEX
Genmab A/S	18/06/2024	12:39:51 PM	1,801.5000	4	CEUX
Genmab A/S	18/06/2024	12:39:54 PM	1,801.5000	24	XCSE
Genmab A/S	18/06/2024	12:39:54 PM	1,801.5000	20	CEUX
Genmab A/S	18/06/2024	12:39:54 PM	1,801.5000	24	XCSE
Genmab A/S	18/06/2024	12:39:54 PM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	12:41:30 PM	1,801.5000	9	XCSE
Genmab A/S	18/06/2024	12:41:30 PM	1,801.5000	21	XCSE
Genmab A/S	18/06/2024	12:41:43 PM	1,801.5000	9	CEUX
Genmab A/S	18/06/2024	12:42:35 PM	1,802.0000	4	CEUX
Genmab A/S	18/06/2024	12:42:35 PM	1,802.0000	10	AQEU
Genmab A/S	18/06/2024	12:42:35 PM	1,802.0000	20	AQEU
Genmab A/S	18/06/2024	12:42:58 PM	1,802.0000	7	CEUX
Genmab A/S	18/06/2024	12:42:58 PM	1,802.0000	17	CEUX
Genmab A/S	18/06/2024	12:42:58 PM	1,802.0000	11	TQEX
Genmab A/S	18/06/2024	12:43:58 PM	1,802.5000	4	CEUX
Genmab A/S	18/06/2024	12:43:58 PM	1,802.5000	14	CEUX
Genmab A/S	18/06/2024	12:43:58 PM	1,802.5000	4	CEUX
Genmab A/S	18/06/2024	12:43:58 PM	1,802.5000	2	AQEU
Genmab A/S	18/06/2024	12:43:58 PM	1,802.5000	6	TQEX
Genmab A/S	18/06/2024	12:43:58 PM	1,802.5000	6	TQEX
Genmab A/S	18/06/2024	12:43:58 PM	1,802.5000	2	AQEU

110

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	12:44:56 PM	1,802.5000	10	XCSE
Genmab A/S	18/06/2024	12:44:56 PM	1,802.5000	40	XCSE
Genmab A/S	18/06/2024	12:46:59 PM	1,803.0000	1	XCSE
Genmab A/S	18/06/2024	12:47:05 PM	1,803.0000	10	XCSE
Genmab A/S	18/06/2024	12:47:05 PM	1,803.0000	69	XCSE
Genmab A/S	18/06/2024	12:47:05 PM	1,803.0000	38	XCSE
Genmab A/S	18/06/2024	12:47:05 PM	1,803.0000	21	XCSE
Genmab A/S	18/06/2024	12:47:05 PM	1,803.0000	9	XCSE
Genmab A/S	18/06/2024	12:47:05 PM	1,803.0000	53	CEUX
Genmab A/S	18/06/2024	12:47:06 PM	1,803.5000	3	AQEU
Genmab A/S	18/06/2024	12:47:06 PM	1,803.5000	3	AQEU
Genmab A/S	18/06/2024	12:47:18 PM	1,804.5000	16	XCSE
Genmab A/S	18/06/2024	12:47:18 PM	1,804.5000	4	XCSE
Genmab A/S	18/06/2024	12:47:26 PM	1,804.5000	18	XCSE
Genmab A/S	18/06/2024	12:47:26 PM	1,804.5000	7	XCSE
Genmab A/S	18/06/2024	12:47:31 PM	1,805.0000	3	XCSE
Genmab A/S	18/06/2024	12:47:47 PM	1,805.5000	1	AQEU
Genmab A/S	18/06/2024	12:47:47 PM	1,805.5000	24	XCSE
Genmab A/S	18/06/2024	12:47:47 PM	1,805.5000	30	XCSE
Genmab A/S	18/06/2024	12:47:47 PM	1,805.5000	20	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	1	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	4	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	1	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	20	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	16	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	12	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	3	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	4	TQEX

111

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	1	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	6	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	6	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	1	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	1	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	7	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	1	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	4	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	4	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	3	CEUX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX

112

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	1	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	39	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	9	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	2	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	16	AQEU
Genmab A/S	18/06/2024	12:47:55 PM	1,804.5000	19	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,804.5000	19	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,804.5000	30	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,804.5000	2	XCSE
Genmab A/S	18/06/2024	12:47:55 PM	1,805.0000	23	AQEU
Genmab A/S	18/06/2024	12:51:07 PM	1,803.5000	10	XCSE
Genmab A/S	18/06/2024	12:51:07 PM	1,803.5000	44	XCSE
Genmab A/S	18/06/2024	12:53:26 PM	1,803.5000	50	XCSE
Genmab A/S	18/06/2024	12:53:26 PM	1,803.5000	169	XCSE
Genmab A/S	18/06/2024	12:53:26 PM	1,803.0000	41	XCSE
Genmab A/S	18/06/2024	12:53:27 PM	1,803.0000	41	XCSE
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	18	XCSE
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	18	XCSE
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	18	XCSE
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	18	XCSE
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	17	CEUX
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	17	CEUX
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	15	CEUX
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	17	CEUX
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	15	CEUX
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	8	CEUX
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	18	XCSE
Genmab A/S	18/06/2024	12:57:58 PM	1,804.0000	9	XCSE
Genmab A/S	18/06/2024	12:58:08 PM	1,803.0000	84	XCSE
Genmab A/S	18/06/2024	12:58:08 PM	1,803.0000	76	CEUX
Genmab A/S	18/06/2024	12:58:08 PM	1,803.0000	12	TQEX
Genmab A/S	18/06/2024	12:58:08 PM	1,803.0000	11	XCSE
Genmab A/S	18/06/2024	1:02:05 PM	1,803.5000	43	CEUX
Genmab A/S	18/06/2024	1:02:05 PM	1,803.5000	15	CEUX
Genmab A/S	18/06/2024	1:02:05 PM	1,803.5000	8	AQEU
Genmab A/S	18/06/2024	1:02:05 PM	1,803.5000	9	TQEX
Genmab A/S	18/06/2024	1:02:05 PM	1,803.5000	64	XCSE
Genmab A/S	18/06/2024	1:02:07 PM	1,802.0000	2	AQEU
Genmab A/S	18/06/2024	1:05:00 PM	1,803.0000	11	AQEU
Genmab A/S	18/06/2024	1:05:00 PM	1,803.0000	2	AQEU
Genmab A/S	18/06/2024	1:05:35 PM	1,803.0000	38	AQEU
Genmab A/S	18/06/2024	1:05:35 PM	1,803.0000	20	AQEU
Genmab A/S	18/06/2024	1:05:35 PM	1,803.0000	1	AQEU
Genmab A/S	18/06/2024	1:06:11 PM	1,803.5000	39	XCSE
Genmab A/S	18/06/2024	1:06:32 PM	1,803.5000	35	XCSE
Genmab A/S	18/06/2024	1:07:32 PM	1,803.5000	38	XCSE

113

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	1:07:32 PM	1,803.5000	96	XCSE
Genmab A/S	18/06/2024	1:07:32 PM	1,803.5000	67	XCSE
Genmab A/S	18/06/2024	1:07:32 PM	1,803.5000	23	XCSE
Genmab A/S	18/06/2024	1:07:32 PM	1,803.5000	49	XCSE
Genmab A/S	18/06/2024	1:07:32 PM	1,803.5000	39	CEUX
Genmab A/S	18/06/2024	1:07:32 PM	1,803.5000	108	CEUX
Genmab A/S	18/06/2024	1:07:33 PM	1,802.0000	76	XCSE
Genmab A/S	18/06/2024	1:07:33 PM	1,802.0000	70	XCSE
Genmab A/S	18/06/2024	1:07:33 PM	1,801.5000	10	CEUX
Genmab A/S	18/06/2024	1:07:33 PM	1,801.5000	3	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	56	XCSE
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	110	XCSE
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	18	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	33	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	17	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	12	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	22	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	48	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	8	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	2	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	8	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	8	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	8	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	8	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	5	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	2	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	7	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	5	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	2	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	5	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	7	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.0000	5	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.0000	21	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.0000	13	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	11	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.5000	4	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.0000	8	CEUX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.0000	3	AQEU
Genmab A/S	18/06/2024	1:12:28 PM	1,801.0000	5	TQEX
Genmab A/S	18/06/2024	1:12:28 PM	1,801.0000	11	XCSE
Genmab A/S	18/06/2024	1:18:35 PM	1,803.0000	20	XCSE
Genmab A/S	18/06/2024	1:18:35 PM	1,803.0000	45	XCSE
Genmab A/S	18/06/2024	1:18:35 PM	1,803.0000	73	CEUX
Genmab A/S	18/06/2024	1:18:35 PM	1,803.0000	5	TQEX
Genmab A/S	18/06/2024	1:20:15 PM	1,803.5000	36	CEUX
Genmab A/S	18/06/2024	1:20:55 PM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	1:22:15 PM	1,805.0000	1	CEUX
Genmab A/S	18/06/2024	1:22:15 PM	1,805.0000	16	CEUX
Genmab A/S	18/06/2024	1:22:15 PM	1,805.0000	6	CEUX

114

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	1:22:15 PM	1,805.0000	20	CEUX
Genmab A/S	18/06/2024	1:22:15 PM	1,805.0000	5	CEUX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	36	CEUX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	43	CEUX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	7	TQEX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	7	TQEX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	2	CEUX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	7	TQEX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	7	TQEX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	43	TQEX
Genmab A/S	18/06/2024	1:22:15 PM	1,804.5000	1	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	15	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	5	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	1	TQEX
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	9	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	11	AQEU
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	39	XCSE
Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	30	XCSE

115

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	1:22:16 PM	1,804.0000	11	XCSE
Genmab A/S	18/06/2024	1:23:11 PM	1,803.0000	8	XCSE
Genmab A/S	18/06/2024	1:23:11 PM	1,803.0000	69	XCSE
Genmab A/S	18/06/2024	1:23:11 PM	1,803.0000	46	XCSE
Genmab A/S	18/06/2024	1:23:11 PM	1,803.0000	69	XCSE
Genmab A/S	18/06/2024	1:23:11 PM	1,802.5000	22	CEUX
Genmab A/S	18/06/2024	1:23:11 PM	1,802.5000	3	AQEU
Genmab A/S	18/06/2024	1:23:11 PM	1,802.5000	5	TQEX
Genmab A/S	18/06/2024	1:23:21 PM	1,802.5000	23	XCSE
Genmab A/S	18/06/2024	1:23:21 PM	1,802.5000	23	XCSE
Genmab A/S	18/06/2024	1:27:24 PM	1,802.0000	18	CEUX
Genmab A/S	18/06/2024	1:27:24 PM	1,802.0000	6	CEUX
Genmab A/S	18/06/2024	1:27:24 PM	1,802.0000	1	TQEX
Genmab A/S	18/06/2024	1:27:24 PM	1,802.0000	20	XCSE
Genmab A/S	18/06/2024	1:27:24 PM	1,802.0000	5	XCSE
Genmab A/S	18/06/2024	1:27:24 PM	1,802.0000	4	TQEX
Genmab A/S	18/06/2024	1:27:24 PM	1,802.0000	1	TQEX
Genmab A/S	18/06/2024	1:31:29 PM	1,803.5000	12	CEUX
Genmab A/S	18/06/2024	1:31:29 PM	1,803.5000	1	CEUX
Genmab A/S	18/06/2024	1:31:29 PM	1,803.5000	3	TQEX
Genmab A/S	18/06/2024	1:31:29 PM	1,803.5000	5	XCSE
Genmab A/S	18/06/2024	1:31:46 PM	1,803.0000	7	XCSE
Genmab A/S	18/06/2024	1:33:13 PM	1,803.0000	53	CEUX
Genmab A/S	18/06/2024	1:33:13 PM	1,803.0000	37	CEUX
Genmab A/S	18/06/2024	1:33:13 PM	1,803.0000	13	AQEU
Genmab A/S	18/06/2024	1:33:13 PM	1,803.0000	14	TQEX
Genmab A/S	18/06/2024	1:33:13 PM	1,803.0000	61	XCSE
Genmab A/S	18/06/2024	1:33:13 PM	1,803.0000	101	XCSE
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	21	CEUX
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	2	CEUX
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	10	CEUX
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	9	CEUX
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	3	AQEU
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	3	AQEU
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	22	XCSE
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	22	XCSE
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	36	XCSE
Genmab A/S	18/06/2024	1:33:13 PM	1,802.5000	22	XCSE
Genmab A/S	18/06/2024	1:34:28 PM	1,802.5000	10	CEUX
Genmab A/S	18/06/2024	1:34:28 PM	1,802.5000	4	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	50	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	22	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	64	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	14	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	22	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	30	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	20	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	2	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	48	XCSE

116

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	16	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	107	XCSE
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	1	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	48	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	9	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	11	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	49	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	58	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	11	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	56	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	2	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	32	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	13	CEUX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	8	AQEU
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	9	AQEU
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	8	AQEU
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	7	AQEU
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	8	TQEX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	1	TQEX
Genmab A/S	18/06/2024	1:36:29 PM	1,803.5000	19	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	14	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	32	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	51	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	60	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	14	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	12	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	10	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	29	XCSE
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	4	CEUX
Genmab A/S	18/06/2024	1:40:27 PM	1,803.5000	1	TQEX
Genmab A/S	18/06/2024	1:48:20 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	1:48:20 PM	1,805.0000	40	AQEU
Genmab A/S	18/06/2024	1:48:28 PM	1,805.5000	13	CEUX
Genmab A/S	18/06/2024	1:48:28 PM	1,805.5000	2	CEUX
Genmab A/S	18/06/2024	1:49:19 PM	1,807.0000	35	XCSE
Genmab A/S	18/06/2024	1:49:19 PM	1,807.0000	35	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	11	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	5	TQEX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE

117

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	3	TQEX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	6	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	3	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	9	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	2	TQEX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	13	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	6	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	3	CEUX
Genmab A/S	18/06/2024	1:49:51 PM	1,807.0000	5	CEUX
Genmab A/S	18/06/2024	1:50:39 PM	1,807.0000	26	XCSE
Genmab A/S	18/06/2024	1:50:39 PM	1,807.0000	4	TQEX
Genmab A/S	18/06/2024	1:51:41 PM	1,807.0000	16	XCSE
Genmab A/S	18/06/2024	1:51:41 PM	1,807.0000	37	CEUX
Genmab A/S	18/06/2024	1:51:41 PM	1,807.0000	18	CEUX
Genmab A/S	18/06/2024	1:51:41 PM	1,807.0000	6	AQEU
Genmab A/S	18/06/2024	1:51:41 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	1:51:41 PM	1,807.0000	6	AQEU
Genmab A/S	18/06/2024	1:52:26 PM	1,808.0000	16	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,808.0000	5	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,808.0000	9	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,808.0000	8	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	4	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	44	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	48	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	23	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	7	AQEU
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	7	AQEU
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	7	AQEU
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	15	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	23	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	7	AQEU
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	7	AQEU
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	7	AQEU
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	24	XCSE

118

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	61	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	53	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	5	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	6	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	3	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	53	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	31	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	9	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	40	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	1:52:26 PM	1,806.5000	6	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,806.5000	78	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,806.5000	22	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,806.5000	24	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,806.5000	73	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,806.5000	46	XCSE
Genmab A/S	18/06/2024	1:52:26 PM	1,806.5000	17	XCSE
Genmab A/S	18/06/2024	1:52:27 PM	1,805.0000	20	CEUX
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	20	CEUX
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	2	AQEU
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	11	XCSE
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	9	XCSE
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	2	AQEU
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	17	CEUX
Genmab A/S	18/06/2024	1:52:30 PM	1,805.0000	20	XCSE
Genmab A/S	18/06/2024	1:52:32 PM	1,805.0000	1	CEUX
Genmab A/S	18/06/2024	1:52:32 PM	1,805.0000	2	AQEU
Genmab A/S	18/06/2024	1:52:32 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	1:52:32 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	1:52:32 PM	1,805.0000	3	TQEX
Genmab A/S	18/06/2024	1:52:32 PM	1,805.0000	20	XCSE
Genmab A/S	18/06/2024	1:52:32 PM	1,805.0000	1	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	37	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	56	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	30	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	52	CEUX
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	42	CEUX
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	10	CEUX
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	52	CEUX
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	8	CEUX
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	15	CEUX
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	56	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	30	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	35	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	52	XCSE
Genmab A/S	18/06/2024	2:01:32 PM	1,806.0000	10	XCSE

119

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	2:01:35 PM	1,804.5000	16	CEUX
Genmab A/S	18/06/2024	2:01:35 PM	1,804.5000	52	CEUX
Genmab A/S	18/06/2024	2:01:35 PM	1,804.0000	19	CEUX
Genmab A/S	18/06/2024	2:01:35 PM	1,804.0000	3	AQEU
Genmab A/S	18/06/2024	2:01:35 PM	1,804.0000	2	AQEU
Genmab A/S	18/06/2024	2:01:35 PM	1,804.0000	20	XCSE
Genmab A/S	18/06/2024	2:01:35 PM	1,804.0000	20	XCSE
Genmab A/S	18/06/2024	2:06:18 PM	1,803.5000	20	CEUX
Genmab A/S	18/06/2024	2:08:26 PM	1,804.5000	36	XCSE
Genmab A/S	18/06/2024	2:08:26 PM	1,804.5000	34	XCSE
Genmab A/S	18/06/2024	2:08:26 PM	1,804.5000	10	XCSE
Genmab A/S	18/06/2024	2:08:26 PM	1,804.5000	2	TQEX
Genmab A/S	18/06/2024	2:08:26 PM	1,804.5000	9	TQEX
Genmab A/S	18/06/2024	2:08:42 PM	1,804.5000	7	TQEX
Genmab A/S	18/06/2024	2:08:42 PM	1,804.5000	43	XCSE
Genmab A/S	18/06/2024	2:08:42 PM	1,804.5000	7	TQEX
Genmab A/S	18/06/2024	2:08:44 PM	1,804.5000	7	TQEX
Genmab A/S	18/06/2024	2:08:44 PM	1,804.5000	1	TQEX
Genmab A/S	18/06/2024	2:08:44 PM	1,804.5000	28	XCSE
Genmab A/S	18/06/2024	2:08:48 PM	1,804.5000	19	XCSE
Genmab A/S	18/06/2024	2:08:48 PM	1,804.5000	5	XCSE
Genmab A/S	18/06/2024	2:09:07 PM	1,804.5000	5	XCSE
Genmab A/S	18/06/2024	2:09:07 PM	1,804.5000	24	XCSE
Genmab A/S	18/06/2024	2:09:07 PM	1,804.5000	5	XCSE
Genmab A/S	18/06/2024	2:09:32 PM	1,804.5000	35	XCSE
Genmab A/S	18/06/2024	2:09:32 PM	1,804.5000	44	CEUX
Genmab A/S	18/06/2024	2:09:32 PM	1,804.5000	20	CEUX
Genmab A/S	18/06/2024	2:09:32 PM	1,804.5000	24	CEUX
Genmab A/S	18/06/2024	2:09:32 PM	1,804.5000	36	CEUX
Genmab A/S	18/06/2024	2:09:32 PM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	2:09:32 PM	1,804.5000	8	CEUX
Genmab A/S	18/06/2024	2:09:39 PM	1,804.5000	45	XCSE
Genmab A/S	18/06/2024	2:11:34 PM	1,804.5000	7	CEUX
Genmab A/S	18/06/2024	2:11:40 PM	1,804.5000	24	XCSE
Genmab A/S	18/06/2024	2:12:44 PM	1,805.0000	61	TQEX
Genmab A/S	18/06/2024	2:12:44 PM	1,805.0000	27	XCSE
Genmab A/S	18/06/2024	2:13:45 PM	1,805.0000	45	XCSE
Genmab A/S	18/06/2024	2:13:45 PM	1,805.0000	76	XCSE
Genmab A/S	18/06/2024	2:13:55 PM	1,805.5000	33	XCSE
Genmab A/S	18/06/2024	2:14:33 PM	1,806.0000	25	XCSE
Genmab A/S	18/06/2024	2:14:33 PM	1,806.0000	12	XCSE
Genmab A/S	18/06/2024	2:14:33 PM	1,806.0000	12	XCSE
Genmab A/S	18/06/2024	2:14:33 PM	1,806.0000	11	CEUX
Genmab A/S	18/06/2024	2:14:34 PM	1,806.0000	11	CEUX
Genmab A/S	18/06/2024	2:14:34 PM	1,806.0000	8	XCSE
Genmab A/S	18/06/2024	2:14:34 PM	1,806.0000	4	XCSE
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	118	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX

120

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	11	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	2	AQEU
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	17	AQEU
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	43	AQEU
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	131	XCSE
Genmab A/S	18/06/2024	2:17:04 PM	1,807.0000	348	XCSE
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	19	XCSE
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	15	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	4	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	19	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	11	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	2	AQEU
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	2	AQEU
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	5	TQEX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	5	TQEX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	5	TQEX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	19	XCSE
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	16	XCSE
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	36	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	31	CEUX
Genmab A/S	18/06/2024	2:17:04 PM	1,806.0000	4	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	58	XCSE
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	9	CEUX

121

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	9	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	9	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	9	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	9	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	9	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	7	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	1	AQEU
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	5	TQEX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	23	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	23	CEUX
Genmab A/S	18/06/2024	2:25:47 PM	1,805.0000	33	XCSE
Genmab A/S	18/06/2024	2:27:53 PM	1,805.0000	9	CEUX
Genmab A/S	18/06/2024	2:27:53 PM	1,805.0000	4	XCSE
Genmab A/S	18/06/2024	2:28:20 PM	1,805.0000	11	XCSE
Genmab A/S	18/06/2024	2:28:20 PM	1,805.0000	87	XCSE
Genmab A/S	18/06/2024	2:28:20 PM	1,805.0000	69	XCSE
Genmab A/S	18/06/2024	2:28:20 PM	1,805.0000	10	CEUX
Genmab A/S	18/06/2024	2:28:20 PM	1,805.0000	36	CEUX
Genmab A/S	18/06/2024	2:28:20 PM	1,805.0000	42	CEUX
Genmab A/S	18/06/2024	2:28:21 PM	1,805.0000	23	XCSE
Genmab A/S	18/06/2024	2:28:21 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	2:31:00 PM	1,805.5000	30	XCSE
Genmab A/S	18/06/2024	2:31:16 PM	1,805.5000	10	XCSE
Genmab A/S	18/06/2024	2:31:16 PM	1,805.5000	29	XCSE
Genmab A/S	18/06/2024	2:31:18 PM	1,804.5000	1	AQEU
Genmab A/S	18/06/2024	2:31:18 PM	1,804.5000	1	AQEU
Genmab A/S	18/06/2024	2:31:39 PM	1,805.5000	30	XCSE
Genmab A/S	18/06/2024	2:31:39 PM	1,805.5000	9	XCSE
Genmab A/S	18/06/2024	2:31:59 PM	1,805.5000	30	XCSE
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	13	CEUX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	18	CEUX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	26	CEUX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	5	CEUX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	19	CEUX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	3	AQEU
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	3	AQEU
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	2	AQEU
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	2	AQEU
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	3	AQEU
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	2	AQEU
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	19	XCSE
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	14	XCSE
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	14	XCSE
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	14	XCSE
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	19	XCSE
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	5	TQEX

122

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	5	TQEX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.0000	13	CEUX
Genmab A/S	18/06/2024	2:32:05 PM	1,804.5000	53	XCSE
Genmab A/S	18/06/2024	2:32:57 PM	1,804.0000	10	XCSE
Genmab A/S	18/06/2024	2:32:57 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	2:32:57 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	2:32:57 PM	1,804.0000	1	XCSE
Genmab A/S	18/06/2024	2:32:57 PM	1,804.0000	1	XCSE
Genmab A/S	18/06/2024	2:33:05 PM	1,804.0000	1	AQEU
Genmab A/S	18/06/2024	2:34:13 PM	1,804.0000	10	CEUX
Genmab A/S	18/06/2024	2:34:13 PM	1,804.0000	2	CEUX
Genmab A/S	18/06/2024	2:34:13 PM	1,804.0000	2	AQEU
Genmab A/S	18/06/2024	2:34:13 PM	1,804.0000	5	AQEU
Genmab A/S	18/06/2024	2:35:07 PM	1,804.5000	31	CEUX
Genmab A/S	18/06/2024	2:35:07 PM	1,804.5000	11	CEUX
Genmab A/S	18/06/2024	2:35:07 PM	1,804.5000	45	XCSE
Genmab A/S	18/06/2024	2:35:15 PM	1,804.5000	6	CEUX
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	40	CEUX
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	40	CEUX
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	11	CEUX
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	7	CEUX
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	33	CEUX
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	5	CEUX
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	2	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	45	XCSE
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	44	XCSE
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	1	XCSE
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	6	XCSE
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	45	XCSE
Genmab A/S	18/06/2024	2:35:26 PM	1,804.0000	9	XCSE
Genmab A/S	18/06/2024	2:35:26 PM	1,803.5000	20	XCSE
Genmab A/S	18/06/2024	2:35:26 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	2:35:26 PM	1,803.5000	5	TQEX
Genmab A/S	18/06/2024	2:35:26 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	2:35:26 PM	1,803.5000	20	XCSE
Genmab A/S	18/06/2024	2:35:27 PM	1,803.5000	19	CEUX
Genmab A/S	18/06/2024	2:35:27 PM	1,803.5000	14	XCSE
Genmab A/S	18/06/2024	2:35:27 PM	1,803.5000	6	XCSE
Genmab A/S	18/06/2024	2:35:28 PM	1,803.5000	5	XCSE
Genmab A/S	18/06/2024	2:35:28 PM	1,803.5000	15	CEUX

123

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	2:35:28 PM	1,803.5000	3	TQEX
Genmab A/S	18/06/2024	2:38:50 PM	1,802.5000	11	XCSE
Genmab A/S	18/06/2024	2:38:59 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	2:38:59 PM	1,803.5000	2	TQEX
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	50	XCSE
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	3	XCSE
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	53	XCSE
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	29	XCSE
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	3	XCSE
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	50	XCSE
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	3	XCSE
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	47	CEUX
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	1	CEUX
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	48	CEUX
Genmab A/S	18/06/2024	2:40:39 PM	1,803.0000	48	CEUX
Genmab A/S	18/06/2024	2:40:51 PM	1,802.5000	49	XCSE
Genmab A/S	18/06/2024	2:40:51 PM	1,802.5000	11	XCSE
Genmab A/S	18/06/2024	2:40:51 PM	1,802.5000	44	CEUX
Genmab A/S	18/06/2024	2:40:51 PM	1,802.5000	11	CEUX
Genmab A/S	18/06/2024	2:40:51 PM	1,802.5000	6	CEUX
Genmab A/S	18/06/2024	2:40:52 PM	1,802.5000	24	CEUX
Genmab A/S	18/06/2024	2:42:13 PM	1,803.5000	1	AQEU
Genmab A/S	18/06/2024	2:42:34 PM	1,803.5000	25	AQEU
Genmab A/S	18/06/2024	2:42:34 PM	1,803.5000	9	AQEU
Genmab A/S	18/06/2024	2:42:34 PM	1,803.5000	1	AQEU
Genmab A/S	18/06/2024	2:42:34 PM	1,803.5000	2	TQEX
Genmab A/S	18/06/2024	2:42:34 PM	1,803.5000	9	TQEX
Genmab A/S	18/06/2024	2:42:41 PM	1,803.5000	6	AQEU
Genmab A/S	18/06/2024	2:42:41 PM	1,803.5000	1	AQEU
Genmab A/S	18/06/2024	2:42:41 PM	1,803.5000	9	TQEX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	25	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	21	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	30	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	4	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	51	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	16	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	33	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	20	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	8	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	9	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	2	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	9	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	2	XCSE

124

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	9	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	69	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	9	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	25	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	7	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	2	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	11	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	24	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	2	AQEU
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	3	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	21	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	15	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	27	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.5000	8	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	3	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	19	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	2	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	23	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	17	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	8	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	14	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	20	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	7	CEUX
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	21	XCSE
Genmab A/S	18/06/2024	2:42:44 PM	1,802.0000	23	XCSE
Genmab A/S	18/06/2024	2:52:11 PM	1,805.0000	3	XCSE
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	7	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	54	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	15	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	30	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	17	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	7	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	4	CEUX
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	8	AQEU
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	13	XCSE
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	46	XCSE
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	14	XCSE
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	14	XCSE

125

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	2	XCSE
Genmab A/S	18/06/2024	2:52:27 PM	1,805.0000	14	XCSE
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	11	CEUX
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	51	CEUX
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	3	CEUX
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	15	CEUX
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	8	AQEU
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	46	XCSE
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	16	XCSE
Genmab A/S	18/06/2024	2:52:32 PM	1,805.0000	5	XCSE
Genmab A/S	18/06/2024	2:52:48 PM	1,805.5000	18	CEUX
Genmab A/S	18/06/2024	2:52:48 PM	1,805.5000	10	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	4	XCSE
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	7	XCSE
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	6	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	8	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:56:05 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	2:58:17 PM	1,807.5000	17	XCSE
Genmab A/S	18/06/2024	2:58:17 PM	1,807.5000	99	XCSE
Genmab A/S	18/06/2024	2:58:17 PM	1,807.5000	24	XCSE
Genmab A/S	18/06/2024	2:58:18 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:58:18 PM	1,807.0000	3	CEUX
Genmab A/S	18/06/2024	2:58:18 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	2:58:18 PM	1,807.0000	1	XCSE
Genmab A/S	18/06/2024	2:58:18 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	2:59:01 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	2:59:01 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	2:59:01 PM	1,807.0000	11	CEUX
Genmab A/S	18/06/2024	2:59:02 PM	1,807.0000	1	CEUX
Genmab A/S	18/06/2024	2:59:02 PM	1,807.0000	24	CEUX
Genmab A/S	18/06/2024	2:59:06 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	2:59:06 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	2:59:06 PM	1,807.0000	30	CEUX
Genmab A/S	18/06/2024	2:59:06 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	2:59:06 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	25	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	CEUX

126

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	23	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	23	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	8	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	4	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	8	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	5	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	18	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	23	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	5	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	13	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	3	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	4	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	4	AQEU
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	25	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	4	AQEU
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	13	CEUX
Genmab A/S	18/06/2024	3:01:30 PM	1,807.0000	1	CEUX
Genmab A/S	18/06/2024	3:01:31 PM	1,807.0000	11	CEUX
Genmab A/S	18/06/2024	3:01:31 PM	1,807.0000	23	CEUX
Genmab A/S	18/06/2024	3:01:31 PM	1,807.0000	4	AQEU
Genmab A/S	18/06/2024	3:01:31 PM	1,807.0000	8	CEUX
Genmab A/S	18/06/2024	3:01:31 PM	1,807.0000	4	AQEU
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	45	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	45	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	4	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	31	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	4	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	35	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	10	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	7	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	10	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,808.0000	10	TQEX
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	11	CEUX

127

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:03 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	1	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	4	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	13	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	11	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	7	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU

128

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	4	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	5	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	6	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	4	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	6	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	9	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	1	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	13	AQEU
Genmab A/S	18/06/2024	3:03:04 PM	1,807.0000	14	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.0000	3	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.0000	27	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	39	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	30	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	5	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	17	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.0000	14	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.0000	39	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	30	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	5	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	10	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	10	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	39	XCSE
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	25	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	25	CEUX
Genmab A/S	18/06/2024	3:03:04 PM	1,807.5000	12	CEUX
Genmab A/S	18/06/2024	3:08:04 PM	1,806.5000	11	XCSE
Genmab A/S	18/06/2024	3:08:04 PM	1,806.5000	12	XCSE
Genmab A/S	18/06/2024	3:09:21 PM	1,808.5000	8	XCSE
Genmab A/S	18/06/2024	3:09:26 PM	1,808.5000	4	XCSE
Genmab A/S	18/06/2024	3:09:26 PM	1,808.5000	12	CEUX
Genmab A/S	18/06/2024	3:09:26 PM	1,808.5000	2	AQEU
Genmab A/S	18/06/2024	3:09:26 PM	1,808.5000	2	AQEU
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	12	XCSE

129

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	2	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	12	CEUX
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	12	CEUX
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	12	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	12	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	12	XCSE
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	12	CEUX
Genmab A/S	18/06/2024	3:10:29 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:10:30 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:10:30 PM	1,809.0000	12	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	6	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	5	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	33	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	33	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	23	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	13	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	3	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	12	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	51	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	5	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	8	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	4	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	10	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	1	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	29	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:11:03 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	3	CEUX
Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	2	XCSE
Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	10	XCSE
Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	10	CEUX

130

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:11:04 PM	1,809.0000	1	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	11	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	3	AQEU
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	7	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	8	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	2	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	8	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	10	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	3	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,808.5000	46	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,809.0000	7	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.5000	23	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.5000	12	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.5000	11	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.5000	12	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.5000	23	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	21	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	21	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	21	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	6	CEUX
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	3	AQEU
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	5	AQEU
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	23	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	45	XCSE
Genmab A/S	18/06/2024	3:11:05 PM	1,808.0000	68	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	13	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	10	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	45	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	17	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	3	AQEU
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	4	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	15	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	1	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	9	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	9	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,808.0000	30	AQEU
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	21	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	21	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	21	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	8	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	22	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	100	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	22	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	21	CEUX

131

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	8	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	21	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	8	XCSE
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	21	CEUX
Genmab A/S	18/06/2024	3:11:06 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	21	CEUX
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	20	CEUX
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	3	AQEU
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	6	XCSE
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	49	XCSE
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	9	AQEU
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	16	AQEU
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	2	AQEU
Genmab A/S	18/06/2024	3:11:07 PM	1,807.5000	12	AQEU
Genmab A/S	18/06/2024	3:20:30 PM	1,806.5000	7	CEUX
Genmab A/S	18/06/2024	3:20:30 PM	1,806.5000	2	AQEU
Genmab A/S	18/06/2024	3:22:01 PM	1,807.0000	40	CEUX
Genmab A/S	18/06/2024	3:22:01 PM	1,807.0000	40	CEUX
Genmab A/S	18/06/2024	3:22:01 PM	1,807.0000	1	CEUX
Genmab A/S	18/06/2024	3:22:01 PM	1,807.0000	26	CEUX
Genmab A/S	18/06/2024	3:22:01 PM	1,807.0000	8	CEUX
Genmab A/S	18/06/2024	3:22:01 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	3:22:01 PM	1,807.0000	21	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	10	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	26	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	8	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	24	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	17	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	26	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	41	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	4	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	19	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	3	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	22	CEUX
Genmab A/S	18/06/2024	3:22:02 PM	1,807.0000	19	CEUX
Genmab A/S	18/06/2024	3:22:03 PM	1,807.0000	14	CEUX
Genmab A/S	18/06/2024	3:22:06 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	3:22:06 PM	1,807.0000	29	CEUX
Genmab A/S	18/06/2024	3:22:06 PM	1,807.0000	12	CEUX
Genmab A/S	18/06/2024	3:22:06 PM	1,807.0000	2	CEUX
Genmab A/S	18/06/2024	3:22:06 PM	1,807.0000	11	CEUX
Genmab A/S	18/06/2024	3:24:47 PM	1,807.0000	43	XCSE
Genmab A/S	18/06/2024	3:24:59 PM	1,807.5000	7	XCSE
Genmab A/S	18/06/2024	3:25:00 PM	1,807.0000	28	CEUX
Genmab A/S	18/06/2024	3:25:00 PM	1,807.0000	9	CEUX
Genmab A/S	18/06/2024	3:25:00 PM	1,807.0000	3	CEUX

132

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:25:00 PM	1,807.0000	40	CEUX
Genmab A/S	18/06/2024	3:25:00 PM	1,807.0000	5	CEUX
Genmab A/S	18/06/2024	3:25:00 PM	1,807.0000	18	CEUX
Genmab A/S	18/06/2024	3:25:10 PM	1,807.0000	18	CEUX
Genmab A/S	18/06/2024	3:25:10 PM	1,807.0000	43	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	11	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	37	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	11	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	4	AQEU
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	20	XCSE
Genmab A/S	18/06/2024	3:27:40 PM	1,807.0000	40	XCSE
Genmab A/S	18/06/2024	3:27:41 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:41 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:41 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:41 PM	1,807.0000	4	AQEU
Genmab A/S	18/06/2024	3:27:41 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:41 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:41 PM	1,807.0000	8	AQEU
Genmab A/S	18/06/2024	3:27:42 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:27:42 PM	1,807.0000	7	XCSE
Genmab A/S	18/06/2024	3:27:42 PM	1,807.0000	53	XCSE
Genmab A/S	18/06/2024	3:27:42 PM	1,807.0000	2	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	6	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	3	XCSE
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	1	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	3	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	4	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	15	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	6	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	2	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	8	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	8	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	8	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	8	AQEU
Genmab A/S	18/06/2024	3:27:43 PM	1,807.0000	12	XCSE
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	11	XCSE
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	11	CEUX
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	5	CEUX
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	11	CEUX
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	2	AQEU
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	2	AQEU
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	11	XCSE
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	19	XCSE
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	11	CEUX

133

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	2	AQEU
Genmab A/S	18/06/2024	3:29:38 PM	1,806.0000	7	XCSE
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	22	CEUX
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	13	CEUX
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	11	AQEU
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	9	CEUX
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	10	CEUX
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	23	XCSE
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	23	XCSE
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	11	XCSE
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	4	CEUX
Genmab A/S	18/06/2024	3:30:01 PM	1,805.0000	22	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	22	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	6	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	21	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	2	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	16	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	14	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	8	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	9	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	22	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	3	AQEU
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	14	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	7	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	1	CEUX
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	48	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	40	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	8	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,805.0000	4	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	6	AQEU
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	6	AQEU
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	6	AQEU
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	6	AQEU
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	35	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	5	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	30	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	5	XCSE
Genmab A/S	18/06/2024	3:30:02 PM	1,804.5000	6	AQEU
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	6	AQEU
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	6	AQEU
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	35	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	40	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	16	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	24	XCSE

134

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	40	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	17	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	4	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	19	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	15	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	3	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	37	XCSE
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	9	AQEU
Genmab A/S	18/06/2024	3:30:03 PM	1,804.5000	15	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	15	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	4	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	19	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	8	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	19	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	6	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	14	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	10	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	44	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	20	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	39	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	9	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	19	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	16	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	19	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	11	CEUX
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	9	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	6	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	11	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	33	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	20	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	15	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	15	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	1	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	13	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	20	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	31	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	33	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	5	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	6	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	4	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU

135

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	3	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	7	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	6	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	12	XCSE
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	5	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	5	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	5	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	5	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	5	AQEU
Genmab A/S	18/06/2024	3:32:06 PM	1,805.5000	37	XCSE
Genmab A/S	18/06/2024	3:32:07 PM	1,805.5000	5	AQEU
Genmab A/S	18/06/2024	3:32:07 PM	1,805.5000	2	AQEU
Genmab A/S	18/06/2024	3:32:07 PM	1,805.5000	41	XCSE
Genmab A/S	18/06/2024	3:32:07 PM	1,805.5000	33	XCSE
Genmab A/S	18/06/2024	3:32:07 PM	1,805.5000	5	AQEU
Genmab A/S	18/06/2024	3:32:07 PM	1,805.5000	7	XCSE
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	15	CEUX
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	3	CEUX
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	3	CEUX
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	3	AQEU
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	1	AQEU
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	20	XCSE
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	20	XCSE
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	15	XCSE
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	20	XCSE
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	90	XCSE
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	10	XCSE
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	3	CEUX
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	3	AQEU
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	1	AQEU
Genmab A/S	18/06/2024	3:36:55 PM	1,800.0000	3	AQEU
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	12	CEUX
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	2	CEUX
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	3	AQEU
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	5	AQEU
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	1	XCSE
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	3	AQEU
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	18	CEUX
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	12	XCSE
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	18	CEUX
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	7	XCSE
Genmab A/S	18/06/2024	3:36:56 PM	1,800.0000	9	CEUX
Genmab A/S	18/06/2024	3:41:21 PM	1,801.0000	12	CEUX
Genmab A/S	18/06/2024	3:41:21 PM	1,801.0000	3	AQEU
Genmab A/S	18/06/2024	3:41:29 PM	1,801.0000	7	CEUX
Genmab A/S	18/06/2024	3:41:29 PM	1,801.0000	2	AQEU
Genmab A/S	18/06/2024	3:41:29 PM	1,801.0000	1	XCSE

136

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:42:33 PM	1,805.5000	13	CEUX
Genmab A/S	18/06/2024	3:42:47 PM	1,806.0000	50	XCSE
Genmab A/S	18/06/2024	3:42:47 PM	1,806.0000	8	XCSE
Genmab A/S	18/06/2024	3:42:47 PM	1,806.0000	11	AQEU
Genmab A/S	18/06/2024	3:42:47 PM	1,806.0000	28	XCSE
Genmab A/S	18/06/2024	3:42:47 PM	1,806.0000	33	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	34	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	98	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	26	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	10	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	88	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	26	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	98	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	16	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	10	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	98	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	16	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	23	CEUX
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	23	CEUX
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	23	CEUX
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	5	CEUX
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	21	CEUX
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	4	AQEU
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	16	AQEU
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	4	AQEU
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	4	AQEU
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	26	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	98	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	2	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	84	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	15	XCSE
Genmab A/S	18/06/2024	3:44:26 PM	1,806.0000	1	XCSE
Genmab A/S	18/06/2024	3:44:27 PM	1,805.0000	5	AQEU
Genmab A/S	18/06/2024	3:44:27 PM	1,805.0000	4	AQEU
Genmab A/S	18/06/2024	3:44:27 PM	1,805.0000	36	XCSE
Genmab A/S	18/06/2024	3:44:27 PM	1,805.0000	13	XCSE
Genmab A/S	18/06/2024	3:44:27 PM	1,805.0000	5	AQEU
Genmab A/S	18/06/2024	3:44:27 PM	1,805.0000	5	AQEU
Genmab A/S	18/06/2024	3:44:27 PM	1,805.0000	1	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	36	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	14	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	11	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	11	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	20	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	24	CEUX
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	9	CEUX
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	28	CEUX
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	AQEU

137

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	3	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	2	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	3	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	1	AQEU
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	20	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	41	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	6	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	20	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	5	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	13	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	6	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	6	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	1	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	36	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	2	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	23	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	6	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	21	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	10	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	15	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	7	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	18	XCSE
Genmab A/S	18/06/2024	3:46:36 PM	1,804.5000	18	XCSE
Genmab A/S	18/06/2024	3:46:37 PM	1,804.5000	7	XCSE
Genmab A/S	18/06/2024	3:46:37 PM	1,804.5000	189	XCSE
Genmab A/S	18/06/2024	3:46:38 PM	1,804.5000	25	XCSE
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	3	AQEU
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	40	XCSE
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	34	XCSE
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	13	XCSE
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	27	XCSE
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	40	XCSE
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	6	XCSE
Genmab A/S	18/06/2024	3:50:21 PM	1,803.0000	34	XCSE

138

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:50:22 PM	1,803.0000	6	XCSE
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	40	XCSE
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	30	XCSE
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	4	XCSE
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	3:50:23 PM	1,803.0000	1	AQEU
Genmab A/S	18/06/2024	3:53:45 PM	1,805.5000	76	XCSE
Genmab A/S	18/06/2024	3:53:55 PM	1,805.5000	17	XCSE
Genmab A/S	18/06/2024	3:54:02 PM	1,805.5000	36	XCSE
Genmab A/S	18/06/2024	3:54:02 PM	1,805.5000	4	XCSE
Genmab A/S	18/06/2024	3:54:05 PM	1,804.5000	3	AQEU
Genmab A/S	18/06/2024	3:54:17 PM	1,805.5000	38	XCSE
Genmab A/S	18/06/2024	3:54:25 PM	1,805.5000	1	XCSE
Genmab A/S	18/06/2024	3:54:25 PM	1,805.5000	10	XCSE
Genmab A/S	18/06/2024	3:54:25 PM	1,805.5000	8	XCSE
Genmab A/S	18/06/2024	3:54:30 PM	1,804.5000	3	AQEU
Genmab A/S	18/06/2024	3:54:30 PM	1,804.5000	23	XCSE
Genmab A/S	18/06/2024	3:54:30 PM	1,804.5000	21	XCSE
Genmab A/S	18/06/2024	3:54:30 PM	1,804.5000	19	XCSE
Genmab A/S	18/06/2024	3:54:30 PM	1,804.5000	13	XCSE
Genmab A/S	18/06/2024	3:54:30 PM	1,804.5000	10	XCSE
Genmab A/S	18/06/2024	3:54:30 PM	1,804.5000	9	XCSE
Genmab A/S	18/06/2024	3:54:31 PM	1,804.5000	23	XCSE
Genmab A/S	18/06/2024	3:55:03 PM	1,804.5000	34	XCSE
Genmab A/S	18/06/2024	3:55:09 PM	1,804.0000	1	XCSE
Genmab A/S	18/06/2024	3:55:16 PM	1,804.5000	37	CEUX
Genmab A/S	18/06/2024	3:55:37 PM	1,806.0000	7	XCSE
Genmab A/S	18/06/2024	3:55:37 PM	1,806.0000	9	XCSE
Genmab A/S	18/06/2024	3:55:37 PM	1,806.0000	10	XCSE
Genmab A/S	18/06/2024	3:55:42 PM	1,807.0000	43	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	37	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	15	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	60	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	1	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	2	XCSE

139

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	20	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	2	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	10	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	14	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	17	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	7	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	21	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	18	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:25 PM	1,807.0000	3	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	25	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	2	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	5	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:26 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:27 PM	1,807.0000	18	XCSE
Genmab A/S	18/06/2024	3:56:27 PM	1,807.0000	6	XCSE
Genmab A/S	18/06/2024	3:56:27 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:56:27 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	6	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	3	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	17	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	58	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	58	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	20	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	38	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	78	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	24	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	4	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	50	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	28	XCSE
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	10	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	10	AQEU

140

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	10	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	10	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	3	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	3	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	4	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	2	AQEU
Genmab A/S	18/06/2024	3:59:10 PM	1,803.5000	28	XCSE
Genmab A/S	18/06/2024	4:02:40 PM	1,805.0000	43	XCSE
Genmab A/S	18/06/2024	4:02:41 PM	1,805.0000	27	XCSE
Genmab A/S	18/06/2024	4:02:41 PM	1,805.0000	19	XCSE
Genmab A/S	18/06/2024	4:02:43 PM	1,805.0000	11	AQEU
Genmab A/S	18/06/2024	4:02:43 PM	1,805.0000	42	AQEU
Genmab A/S	18/06/2024	4:02:43 PM	1,805.0000	25	XCSE
Genmab A/S	18/06/2024	4:02:43 PM	1,805.0000	84	XCSE
Genmab A/S	18/06/2024	4:02:43 PM	1,805.0000	335	XCSE
Genmab A/S	18/06/2024	4:02:43 PM	1,803.5000	31	XCSE
Genmab A/S	18/06/2024	4:02:43 PM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	4:02:43 PM	1,803.5000	32	XCSE
Genmab A/S	18/06/2024	4:02:43 PM	1,803.5000	49	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	24	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	4	AQEU
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	5	AQEU
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	2	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	1	XCSE
Genmab A/S	18/06/2024	4:05:04 PM	1,803.0000	4	AQEU
Genmab A/S	18/06/2024	4:05:05 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:06 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	24	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	2	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	26	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	5	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	11	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	4	AQEU
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	13	XCSE
Genmab A/S	18/06/2024	4:05:07 PM	1,803.0000	14	XCSE
Genmab A/S	18/06/2024	4:05:11 PM	1,801.5000	5	AQEU
Genmab A/S	18/06/2024	4:05:11 PM	1,801.5000	39	XCSE
Genmab A/S	18/06/2024	4:07:23 PM	1,803.0000	8	XCSE
Genmab A/S	18/06/2024	4:07:23 PM	1,803.0000	31	XCSE
Genmab A/S	18/06/2024	4:07:26 PM	1,803.0000	8	XCSE
Genmab A/S	18/06/2024	4:07:26 PM	1,803.0000	8	XCSE
Genmab A/S	18/06/2024	4:07:31 PM	1,802.5000	29	CEUX

141

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:07:31 PM	1,802.5000	5	CEUX
Genmab A/S	18/06/2024	4:07:40 PM	1,802.5000	40	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	5	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	7	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	5	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	5	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	13	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	21	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	33	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	33	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	21	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	20	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	13	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	21	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	2	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	13	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	20	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	21	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	7	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	33	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	21	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	46	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	3	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	3	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	5	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	9	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	7	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	5	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	5	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	2	AQEU
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	30	XCSE
Genmab A/S	18/06/2024	4:07:52 PM	1,802.0000	48	XCSE
Genmab A/S	18/06/2024	4:07:53 PM	1,802.0000	24	XCSE
Genmab A/S	18/06/2024	4:07:53 PM	1,802.0000	5	XCSE
Genmab A/S	18/06/2024	4:07:53 PM	1,802.0000	6	AQEU
Genmab A/S	18/06/2024	4:07:54 PM	1,801.5000	11	XCSE
Genmab A/S	18/06/2024	4:07:54 PM	1,801.5000	12	XCSE
Genmab A/S	18/06/2024	4:07:54 PM	1,801.5000	19	XCSE
Genmab A/S	18/06/2024	4:07:54 PM	1,801.5000	23	XCSE
Genmab A/S	18/06/2024	4:09:00 PM	1,799.5000	45	XCSE
Genmab A/S	18/06/2024	4:09:00 PM	1,799.5000	6	AQEU
Genmab A/S	18/06/2024	4:09:00 PM	1,799.5000	3	XCSE
Genmab A/S	18/06/2024	4:09:00 PM	1,799.5000	4	AQEU
Genmab A/S	18/06/2024	4:09:00 PM	1,799.5000	10	XCSE
Genmab A/S	18/06/2024	4:09:55 PM	1,799.5000	9	AQEU

142

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:09:56 PM	1,799.5000	2	AQEU
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	69	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	31	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	84	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	62	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	22	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	84	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	9	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	53	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	51	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.5000	42	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	10	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	1	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	39	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	49	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	1	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	6	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	44	XCSE
Genmab A/S	18/06/2024	4:11:01 PM	1,799.0000	6	XCSE
Genmab A/S	18/06/2024	4:13:07 PM	1,800.5000	64	XCSE
Genmab A/S	18/06/2024	4:13:07 PM	1,800.5000	5	XCSE
Genmab A/S	18/06/2024	4:13:07 PM	1,800.5000	54	XCSE
Genmab A/S	18/06/2024	4:13:07 PM	1,800.5000	9	AQEU
Genmab A/S	18/06/2024	4:13:07 PM	1,800.5000	8	AQEU
Genmab A/S	18/06/2024	4:13:07 PM	1,800.5000	5	XCSE
Genmab A/S	18/06/2024	4:13:07 PM	1,800.5000	3	XCSE
Genmab A/S	18/06/2024	4:15:01 PM	1,800.5000	36	CEUX
Genmab A/S	18/06/2024	4:15:01 PM	1,800.0000	22	AQEU
Genmab A/S	18/06/2024	4:15:01 PM	1,800.0000	16	XCSE
Genmab A/S	18/06/2024	4:15:01 PM	1,800.0000	160	XCSE
Genmab A/S	18/06/2024	4:15:01 PM	1,800.0000	143	XCSE
Genmab A/S	18/06/2024	4:15:01 PM	1,800.0000	16	XCSE
Genmab A/S	18/06/2024	4:15:01 PM	1,800.0000	143	XCSE
Genmab A/S	18/06/2024	4:15:01 PM	1,800.0000	36	XCSE
Genmab A/S	18/06/2024	4:15:02 PM	1,799.5000	49	XCSE
Genmab A/S	18/06/2024	4:15:02 PM	1,799.5000	16	XCSE
Genmab A/S	18/06/2024	4:15:02 PM	1,799.5000	20	XCSE
Genmab A/S	18/06/2024	4:15:02 PM	1,799.5000	13	XCSE
Genmab A/S	18/06/2024	4:15:02 PM	1,799.5000	6	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	6	AQEU
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	14	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	26	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	12	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	6	AQEU
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	13	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	24	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	40	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	6	AQEU
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	6	AQEU

143

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	15	XCSE
Genmab A/S	18/06/2024	4:16:09 PM	1,799.0000	1	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	3	AQEU
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	18	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	27	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	10	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	3	AQEU
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	8	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	27	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	10	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	3	AQEU
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	18	XCSE
Genmab A/S	18/06/2024	4:18:59 PM	1,799.5000	27	XCSE
Genmab A/S	18/06/2024	4:19:03 PM	1,799.5000	18	XCSE
Genmab A/S	18/06/2024	4:19:05 PM	1,799.5000	18	XCSE
Genmab A/S	18/06/2024	4:19:05 PM	1,799.5000	3	AQEU
Genmab A/S	18/06/2024	4:19:05 PM	1,799.5000	16	XCSE
Genmab A/S	18/06/2024	4:19:06 PM	1,799.5000	2	XCSE
Genmab A/S	18/06/2024	4:21:57 PM	1,802.0000	27	CEUX
Genmab A/S	18/06/2024	4:22:09 PM	1,802.0000	2	CEUX
Genmab A/S	18/06/2024	4:22:09 PM	1,802.0000	23	AQEU
Genmab A/S	18/06/2024	4:22:09 PM	1,802.0000	23	AQEU
Genmab A/S	18/06/2024	4:23:15 PM	1,802.5000	13	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	110	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	27	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	27	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	50	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	73	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	137	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	10	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	3	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	10	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.5000	36	XCSE
Genmab A/S	18/06/2024	4:23:21 PM	1,802.0000	23	XCSE
Genmab A/S	18/06/2024	4:23:22 PM	1,802.0000	22	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	124	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	8	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	10	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	100	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	14	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	14	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	24	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	27	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	15	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	44	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	70	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	22	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,802.0000	12	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,801.5000	3	AQEU

144

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:24:09 PM	1,801.5000	22	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,801.5000	52	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,801.5000	3	AQEU
Genmab A/S	18/06/2024	4:24:09 PM	1,801.5000	3	AQEU
Genmab A/S	18/06/2024	4:24:09 PM	1,801.5000	22	XCSE
Genmab A/S	18/06/2024	4:24:09 PM	1,801.5000	25	XCSE
Genmab A/S	18/06/2024	4:24:11 PM	1,801.5000	27	XCSE
Genmab A/S	18/06/2024	4:24:11 PM	1,801.5000	22	XCSE
Genmab A/S	18/06/2024	4:24:11 PM	1,801.5000	3	AQEU
Genmab A/S	18/06/2024	4:26:55 PM	1,801.0000	181	XCSE
Genmab A/S	18/06/2024	4:26:55 PM	1,801.0000	93	XCSE
Genmab A/S	18/06/2024	4:26:55 PM	1,801.0000	23	AQEU
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	65	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	28	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	28	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	65	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	50	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	43	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	88	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	3	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	2	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	3	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	20	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	51	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	22	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	22	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,801.0000	15	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,800.5000	46	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,800.5000	46	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,800.5000	40	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,800.5000	6	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,800.5000	85	XCSE
Genmab A/S	18/06/2024	4:26:56 PM	1,800.5000	3	XCSE
Genmab A/S	18/06/2024	4:27:00 PM	1,800.5000	24	XCSE
Genmab A/S	18/06/2024	4:27:00 PM	1,800.5000	19	XCSE
Genmab A/S	18/06/2024	4:27:00 PM	1,800.5000	4	XCSE
Genmab A/S	18/06/2024	4:30:06 PM	1,800.5000	26	XCSE
Genmab A/S	18/06/2024	4:30:06 PM	1,800.5000	100	XCSE
Genmab A/S	18/06/2024	4:30:06 PM	1,800.5000	44	XCSE
Genmab A/S	18/06/2024	4:30:06 PM	1,800.5000	17	XCSE
Genmab A/S	18/06/2024	4:30:06 PM	1,800.5000	141	XCSE
Genmab A/S	18/06/2024	4:30:06 PM	1,800.5000	12	XCSE
Genmab A/S	18/06/2024	4:30:06 PM	1,800.5000	46	XCSE
Genmab A/S	18/06/2024	4:31:08 PM	1,799.5000	44	XCSE
Genmab A/S	18/06/2024	4:31:08 PM	1,799.5000	45	XCSE
Genmab A/S	18/06/2024	4:31:08 PM	1,799.5000	28	XCSE
Genmab A/S	18/06/2024	4:31:08 PM	1,799.5000	44	XCSE
Genmab A/S	18/06/2024	4:31:08 PM	1,799.5000	45	XCSE
Genmab A/S	18/06/2024	4:35:40 PM	1,805.0000	148	XCSE

145

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:35:40 PM	1,805.0000	18	XCSE
Genmab A/S	18/06/2024	4:35:40 PM	1,805.0000	130	XCSE
Genmab A/S	18/06/2024	4:35:40 PM	1,805.0000	307	XCSE
Genmab A/S	18/06/2024	4:35:40 PM	1,805.0000	57	XCSE
Genmab A/S	18/06/2024	4:35:40 PM	1,805.0000	49	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	39	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	13	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	52	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	114	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	10	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	34	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	8	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	10	XCSE
Genmab A/S	18/06/2024	4:37:33 PM	1,803.5000	29	XCSE
Genmab A/S	18/06/2024	4:37:34 PM	1,803.5000	23	XCSE
Genmab A/S	18/06/2024	4:37:34 PM	1,803.5000	20	XCSE
Genmab A/S	18/06/2024	4:37:34 PM	1,803.5000	18	XCSE
Genmab A/S	18/06/2024	4:37:34 PM	1,803.5000	31	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	18	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	6	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	30	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	11	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	68	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	2	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	24	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	111	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	5	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	5	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	14	XCSE
Genmab A/S	18/06/2024	4:42:09 PM	1,806.5000	111	XCSE
Genmab A/S	18/06/2024	4:42:22 PM	1,806.5000	40	XCSE
Genmab A/S	18/06/2024	4:42:27 PM	1,806.5000	38	XCSE
Genmab A/S	18/06/2024	4:42:43 PM	1,806.5000	35	XCSE
Genmab A/S	18/06/2024	4:42:50 PM	1,806.5000	37	XCSE
Genmab A/S	18/06/2024	4:42:55 PM	1,806.5000	15	XCSE
Genmab A/S	18/06/2024	4:43:07 PM	1,807.0000	13	XCSE
Genmab A/S	18/06/2024	4:43:52 PM	1,807.0000	45	XCSE
Genmab A/S	18/06/2024	4:43:52 PM	1,807.0000	6	AQEU
Genmab A/S	18/06/2024	4:43:59 PM	1,807.0000	45	XCSE
Genmab A/S	18/06/2024	4:43:59 PM	1,807.0000	45	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	6	AQEU
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	16	AQEU
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	21	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	29	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	43	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	26	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	22	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	59	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	45	XCSE

146

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	179	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	21	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	1	XCSE
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	2	AQEU
Genmab A/S	18/06/2024	4:45:14 PM	1,807.0000	18	XCSE
Genmab A/S	18/06/2024	4:45:15 PM	1,807.0000	13	AQEU
Genmab A/S	18/06/2024	4:45:15 PM	1,807.0000	39	XCSE
Genmab A/S	18/06/2024	4:45:15 PM	1,807.0000	30	XCSE
Genmab A/S	18/06/2024	4:45:15 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	4:45:15 PM	1,807.0000	11	XCSE
Genmab A/S	18/06/2024	4:45:16 PM	1,806.5000	169	XCSE
Genmab A/S	18/06/2024	4:45:32 PM	1,806.0000	15	XCSE
Genmab A/S	18/06/2024	4:45:47 PM	1,807.0000	13	AQEU
Genmab A/S	18/06/2024	4:45:47 PM	1,807.0000	2	AQEU
Genmab A/S	18/06/2024	4:45:55 PM	1,807.0000	14	XCSE
Genmab A/S	18/06/2024	4:45:55 PM	1,807.0000	8	XCSE
Genmab A/S	18/06/2024	4:45:55 PM	1,807.0000	8	XCSE
Genmab A/S	18/06/2024	4:45:55 PM	1,807.0000	39	XCSE
Genmab A/S	18/06/2024	4:45:55 PM	1,807.0000	24	XCSE
Genmab A/S	18/06/2024	4:46:32 PM	1,806.5000	70	XCSE
Genmab A/S	18/06/2024	4:46:32 PM	1,806.5000	9	XCSE
Genmab A/S	18/06/2024	4:46:32 PM	1,806.5000	50	XCSE
Genmab A/S	18/06/2024	4:46:32 PM	1,806.5000	23	XCSE
Genmab A/S	18/06/2024	4:46:32 PM	1,806.5000	129	XCSE
Genmab A/S	18/06/2024	4:47:07 PM	1,806.0000	30	XCSE
Genmab A/S	18/06/2024	4:47:08 PM	1,806.0000	4	AQEU
Genmab A/S	18/06/2024	4:47:08 PM	1,806.0000	19	XCSE
Genmab A/S	18/06/2024	4:47:12 PM	1,806.0000	35	XCSE
Genmab A/S	18/06/2024	4:47:12 PM	1,806.0000	9	XCSE
Genmab A/S	18/06/2024	4:47:12 PM	1,806.0000	14	XCSE
Genmab A/S	18/06/2024	4:47:17 PM	1,806.0000	5	AQEU
Genmab A/S	18/06/2024	4:47:17 PM	1,806.0000	13	AQEU
Genmab A/S	18/06/2024	4:47:17 PM	1,806.0000	18	XCSE
Genmab A/S	18/06/2024	4:47:22 PM	1,806.0000	5	AQEU
Genmab A/S	18/06/2024	4:47:22 PM	1,806.0000	5	AQEU
Genmab A/S	18/06/2024	4:47:22 PM	1,806.0000	11	XCSE
Genmab A/S	18/06/2024	4:47:27 PM	1,806.0000	2	AQEU
Genmab A/S	18/06/2024	4:47:27 PM	1,806.0000	2	XCSE
Genmab A/S	18/06/2024	4:47:32 PM	1,807.0000	1	XCSE
Genmab A/S	18/06/2024	4:47:38 PM	1,807.0000	1	XCSE
Genmab A/S	18/06/2024	4:47:40 PM	1,807.0000	30	XCSE
Genmab A/S	18/06/2024	4:47:43 PM	1,807.0000	1	XCSE
Genmab A/S	18/06/2024	4:47:53 PM	1,807.5000	10	AQEU
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	21	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	16	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	15	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	21	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	19	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	33	XCSE

147

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	17	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	52	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	5	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	8	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	39	XCSE
Genmab A/S	18/06/2024	4:48:49 PM	1,808.5000	52	XCSE
Genmab A/S	18/06/2024	4:48:50 PM	1,808.5000	40	XCSE
Genmab A/S	18/06/2024	4:48:50 PM	1,808.5000	12	XCSE
Genmab A/S	18/06/2024	4:48:50 PM	1,808.5000	12	XCSE
Genmab A/S	18/06/2024	4:48:50 PM	1,808.5000	40	XCSE
Genmab A/S	18/06/2024	4:49:28 PM	1,808.5000	39	XCSE
Genmab A/S	18/06/2024	4:49:38 PM	1,808.5000	17	XCSE
Genmab A/S	18/06/2024	4:49:41 PM	1,808.5000	18	XCSE
Genmab A/S	18/06/2024	4:49:42 PM	1,808.5000	12	XCSE
Genmab A/S	18/06/2024	4:49:44 PM	1,808.5000	12	XCSE
Genmab A/S	18/06/2024	4:49:46 PM	1,808.5000	14	XCSE
Genmab A/S	18/06/2024	4:49:48 PM	1,808.5000	8	XCSE
Genmab A/S	18/06/2024	4:49:51 PM	1,808.5000	9	XCSE
Genmab A/S	18/06/2024	4:49:51 PM	1,808.5000	9	XCSE
Genmab A/S	18/06/2024	4:49:51 PM	1,808.5000	34	XCSE
Genmab A/S	18/06/2024	4:49:56 PM	1,808.5000	5	XCSE
Genmab A/S	18/06/2024	4:50:01 PM	1,808.5000	1	XCSE
Genmab A/S	18/06/2024	4:50:06 PM	1,808.5000	1	XCSE
Genmab A/S	18/06/2024	4:50:08 PM	1,808.5000	41	XCSE
Genmab A/S	18/06/2024	4:50:12 PM	1,808.5000	1	XCSE
Genmab A/S	18/06/2024	4:50:20 PM	1,808.5000	1	XCSE
Genmab A/S	18/06/2024	4:50:20 PM	1,808.5000	3	XCSE
Genmab A/S	18/06/2024	4:50:20 PM	1,808.5000	205	XCSE
Genmab A/S	18/06/2024	4:50:20 PM	1,808.5000	69	XCSE
Genmab A/S	18/06/2024	4:50:20 PM	1,808.5000	27	XCSE
Genmab A/S	18/06/2024	4:50:31 PM	1,808.0000	24	XCSE
Genmab A/S	18/06/2024	4:51:50 PM	1,808.5000	31	XCSE
Genmab A/S	18/06/2024	4:51:50 PM	1,808.5000	23	XCSE
Genmab A/S	18/06/2024	4:51:52 PM	1,808.5000	32	XCSE
Genmab A/S	18/06/2024	4:52:52 PM	1,811.0000	51	XCSE
Genmab A/S	18/06/2024	4:52:52 PM	1,811.0000	51	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	42	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	42	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	20	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	83	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	42	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	79	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	14	XCSE

148

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	62	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:04 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:05 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:05 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:05 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:05 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:06 PM	1,811.5000	18	XCSE
Genmab A/S	18/06/2024	4:53:06 PM	1,811.5000	18	XCSE
Genmab A/S	18/06/2024	4:53:06 PM	1,811.5000	108	XCSE
Genmab A/S	18/06/2024	4:53:08 PM	1,811.5000	106	XCSE
Genmab A/S	18/06/2024	4:53:08 PM	1,811.5000	2	XCSE
Genmab A/S	18/06/2024	4:53:08 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:08 PM	1,811.5000	23	XCSE
Genmab A/S	18/06/2024	4:53:08 PM	1,811.5000	13	XCSE
Genmab A/S	18/06/2024	4:53:09 PM	1,811.5000	25	XCSE
Genmab A/S	18/06/2024	4:53:09 PM	1,811.5000	47	XCSE
Genmab A/S	18/06/2024	4:53:09 PM	1,811.5000	21	XCSE
Genmab A/S	18/06/2024	4:53:09 PM	1,811.5000	64	XCSE
Genmab A/S	18/06/2024	4:53:10 PM	1,811.5000	44	XCSE
Genmab A/S	18/06/2024	4:53:11 PM	1,811.5000	108	XCSE
Genmab A/S	18/06/2024	4:53:11 PM	1,811.5000	17	XCSE
Genmab A/S	18/06/2024	4:53:11 PM	1,811.5000	30	XCSE
Genmab A/S	18/06/2024	4:53:11 PM	1,811.5000	61	XCSE
Genmab A/S	18/06/2024	4:53:15 PM	1,811.5000	108	XCSE
Genmab A/S	18/06/2024	4:53:15 PM	1,811.5000	12	XCSE
Genmab A/S	18/06/2024	4:53:15 PM	1,811.0000	219	XCSE
Genmab A/S	18/06/2024	4:54:04 PM	1,811.5000	25	XCSE
Genmab A/S	18/06/2024	4:54:05 PM	1,811.5000	34	XCSE
Genmab A/S	18/06/2024	4:54:07 PM	1,811.5000	8	XCSE
Genmab A/S	18/06/2024	4:54:07 PM	1,811.5000	6	AQEU
Genmab A/S	18/06/2024	4:54:19 PM	1,812.0000	21	XCSE
Genmab A/S	18/06/2024	4:54:19 PM	1,812.0000	27	AQEU
Genmab A/S	18/06/2024	4:54:19 PM	1,812.0000	7	AQEU
Genmab A/S	18/06/2024	4:54:19 PM	1,812.0000	9	AQEU
Genmab A/S	18/06/2024	4:54:19 PM	1,812.0000	18	AQEU
Genmab A/S	18/06/2024	4:54:19 PM	1,812.0000	27	AQEU
Genmab A/S	18/06/2024	4:54:19 PM	1,812.0000	21	XCSE
Genmab A/S	18/06/2024	4:54:25 PM	1,812.0000	21	XCSE
Genmab A/S	18/06/2024	4:54:41 PM	1,813.0000	14	XCSE
Genmab A/S	18/06/2024	4:54:44 PM	1,813.0000	7	XCSE
Genmab A/S	18/06/2024	4:54:45 PM	1,813.0000	25	XCSE
Genmab A/S	18/06/2024	4:54:46 PM	1,813.0000	24	XCSE

149

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	18/06/2024	4:54:46 PM	1,813.0000	24	XCSE
Genmab A/S	18/06/2024	4:54:46 PM	1,813.0000	21	XCSE
Genmab A/S	18/06/2024	4:54:49 PM	1,813.0000	29	XCSE
Genmab A/S	18/06/2024	4:54:49 PM	1,813.0000	24	XCSE
Genmab A/S	18/06/2024	4:54:49 PM	1,813.0000	20	XCSE
Genmab A/S	18/06/2024	4:54:49 PM	1,813.0000	53	XCSE
Genmab A/S	18/06/2024	4:54:50 PM	1,813.0000	29	XCSE
Genmab A/S	18/06/2024	4:54:50 PM	1,813.0000	1	XCSE
Genmab A/S	19/06/2024	9:15:27 AM	1,789.5000	9	CEUX
Genmab A/S	19/06/2024	9:15:30 AM	1,789.5000	40	CEUX
Genmab A/S	19/06/2024	9:15:32 AM	1,789.0000	36	CEUX
Genmab A/S	19/06/2024	9:15:32 AM	1,789.0000	1	CEUX
Genmab A/S	19/06/2024	9:15:32 AM	1,789.0000	5	TQEX
Genmab A/S	19/06/2024	9:15:32 AM	1,789.0000	41	XCSE
Genmab A/S	19/06/2024	9:15:32 AM	1,789.0000	41	XCSE
Genmab A/S	19/06/2024	9:15:32 AM	1,789.0000	41	XCSE
Genmab A/S	19/06/2024	9:15:32 AM	1,789.0000	41	XCSE
Genmab A/S	19/06/2024	9:15:41 AM	1,788.5000	3	XCSE
Genmab A/S	19/06/2024	9:15:48 AM	1,788.5000	3	XCSE
Genmab A/S	19/06/2024	9:15:49 AM	1,788.5000	20	CEUX
Genmab A/S	19/06/2024	9:16:42 AM	1,790.0000	6	AQEU
Genmab A/S	19/06/2024	9:16:42 AM	1,790.0000	7	TQEX
Genmab A/S	19/06/2024	9:16:42 AM	1,790.0000	26	XCSE
Genmab A/S	19/06/2024	9:16:54 AM	1,790.0000	1	XCSE
Genmab A/S	19/06/2024	9:16:54 AM	1,790.0000	36	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,793.0000	3	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,793.0000	16	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,793.0000	35	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,793.0000	13	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,793.0000	12	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,793.0000	14	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,792.0000	12	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,792.0000	12	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,792.0000	12	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,792.0000	12	XCSE
Genmab A/S	19/06/2024	9:17:24 AM	1,792.0000	12	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	37	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	35	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	35	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	35	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	4	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	24	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	7	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	35	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	37	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	20	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	16	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	21	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	37	XCSE

150

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	37	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	3	XCSE
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	9	CEUX
Genmab A/S	19/06/2024	9:17:47 AM	1,792.0000	4	CEUX
Genmab A/S	19/06/2024	9:18:03 AM	1,790.5000	18	XCSE
Genmab A/S	19/06/2024	9:18:48 AM	1,791.5000	12	XCSE
Genmab A/S	19/06/2024	9:18:48 AM	1,791.5000	94	XCSE
Genmab A/S	19/06/2024	9:18:48 AM	1,791.5000	12	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,791.0000	24	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,791.0000	63	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	2	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	1	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	19	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	18	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	19	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	18	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	19	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	18	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	7	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	6	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.5000	36	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	4	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	14	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	18	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	16	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	6	XCSE

151

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	13	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	18	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	18	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	7	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	18	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	2	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	1	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	8	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	1	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	3	AQEU
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	1	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,789.5000	2	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,789.5000	3	TQEX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	35	CEUX
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	21	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	5	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	11	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,790.0000	15	XCSE
Genmab A/S	19/06/2024	9:19:36 AM	1,789.5000	17	XCSE
Genmab A/S	19/06/2024	9:20:17 AM	1,785.5000	8	CEUX
Genmab A/S	19/06/2024	9:20:17 AM	1,785.5000	18	XCSE
Genmab A/S	19/06/2024	9:20:17 AM	1,785.5000	10	CEUX
Genmab A/S	19/06/2024	9:20:17 AM	1,785.5000	9	CEUX
Genmab A/S	19/06/2024	9:20:17 AM	1,785.5000	18	CEUX
Genmab A/S	19/06/2024	9:20:17 AM	1,785.5000	5	TQEX
Genmab A/S	19/06/2024	9:21:04 AM	1,782.0000	6	CEUX
Genmab A/S	19/06/2024	9:21:04 AM	1,782.0000	35	XCSE

152

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:21:04 AM	1,782.0000	14	XCSE
Genmab A/S	19/06/2024	9:21:04 AM	1,782.0000	18	XCSE
Genmab A/S	19/06/2024	9:21:04 AM	1,782.0000	10	XCSE
Genmab A/S	19/06/2024	9:24:05 AM	1,781.0000	92	CEUX
Genmab A/S	19/06/2024	9:24:05 AM	1,781.0000	13	AQEU
Genmab A/S	19/06/2024	9:24:05 AM	1,781.0000	14	TQEX
Genmab A/S	19/06/2024	9:24:05 AM	1,781.0000	84	XCSE
Genmab A/S	19/06/2024	9:24:05 AM	1,781.0000	18	XCSE
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	43	CEUX
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	23	CEUX
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	6	AQEU
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	7	TQEX
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	7	TQEX
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	9	AQEU
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	47	XCSE
Genmab A/S	19/06/2024	9:25:05 AM	1,777.0000	24	XCSE
Genmab A/S	19/06/2024	9:25:06 AM	1,777.0000	37	XCSE
Genmab A/S	19/06/2024	9:25:06 AM	1,777.0000	26	XCSE
Genmab A/S	19/06/2024	9:26:18 AM	1,776.0000	21	XCSE
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	32	CEUX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	32	CEUX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	32	CEUX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	32	CEUX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	32	CEUX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	25	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	11	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	4	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	4	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	11	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	4	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	11	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	4	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	6	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	6	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	3	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	3	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	3	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	6	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,777.5000	8	XCSE
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	32	CEUX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	4	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	11	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	9	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	4	AQEU
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	6	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	32	CEUX
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	5	TQEX
Genmab A/S	19/06/2024	9:27:47 AM	1,777.5000	8	XCSE
Genmab A/S	19/06/2024	9:27:47 AM	1,778.0000	8	CEUX

153

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:28:04 AM	1,777.0000	67	XCSE
Genmab A/S	19/06/2024	9:28:04 AM	1,777.0000	60	CEUX
Genmab A/S	19/06/2024	9:28:04 AM	1,777.0000	9	TQEX
Genmab A/S	19/06/2024	9:28:04 AM	1,776.5000	5	TQEX
Genmab A/S	19/06/2024	9:28:04 AM	1,776.5000	5	TQEX
Genmab A/S	19/06/2024	9:28:04 AM	1,776.5000	19	XCSE
Genmab A/S	19/06/2024	9:28:04 AM	1,776.5000	17	XCSE
Genmab A/S	19/06/2024	9:28:04 AM	1,776.5000	19	XCSE
Genmab A/S	19/06/2024	9:28:04 AM	1,776.5000	11	XCSE
Genmab A/S	19/06/2024	9:28:04 AM	1,777.0000	2	AQEU
Genmab A/S	19/06/2024	9:29:13 AM	1,779.5000	24	CEUX
Genmab A/S	19/06/2024	9:29:13 AM	1,779.5000	31	CEUX
Genmab A/S	19/06/2024	9:29:13 AM	1,779.5000	9	TQEX
Genmab A/S	19/06/2024	9:29:50 AM	1,779.5000	52	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,779.5000	25	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,779.5000	27	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,779.5000	27	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,779.5000	13	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	23	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	23	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	13	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	3	AQEU
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	21	CEUX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	21	CEUX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	12	CEUX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	3	AQEU
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	36	CEUX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.0000	18	CEUX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.0000	20	CEUX
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	12	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	9	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	3	XCSE
Genmab A/S	19/06/2024	9:29:50 AM	1,778.5000	11	XCSE
Genmab A/S	19/06/2024	9:29:52 AM	1,778.0000	5	TQEX
Genmab A/S	19/06/2024	9:29:52 AM	1,778.0000	3	TQEX
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	5	TQEX
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	2	TQEX
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	3	TQEX
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	21	CEUX
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	17	CEUX
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	5	TQEX
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	23	XCSE
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	6	XCSE
Genmab A/S	19/06/2024	9:29:53 AM	1,777.5000	12	XCSE
Genmab A/S	19/06/2024	9:31:54 AM	1,775.5000	41	XCSE
Genmab A/S	19/06/2024	9:31:54 AM	1,775.5000	19	XCSE

154

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:31:54 AM	1,775.5000	19	XCSE
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	XCSE
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	38	XCSE
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	1	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	7	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	7	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	4	CEUX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	1	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	1	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	3	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	9	TQEX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	XCSE
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	27	XCSE
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	9	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	9	TQEX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	10	TQEX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	3	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	6	TQEX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	6	TQEX
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	6	XCSE
Genmab A/S	19/06/2024	9:32:38 AM	1,775.0000	12	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	91	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	23	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	18	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	27	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	20	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	103	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	2	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	7	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	CEUX

155

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	5	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	15	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	1	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	1	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	13	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	1	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	15	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	1	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	16	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	16	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	16	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	19	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	19	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	19	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	19	CEUX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	19	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	5	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	19	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	1	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	7	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,774.5000	12	XCSE
Genmab A/S	19/06/2024	9:34:35 AM	1,775.0000	9	XCSE
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	19	XCSE
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	1	CEUX
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	1	XCSE
Genmab A/S	19/06/2024	9:34:36 AM	1,774.5000	34	CEUX
Genmab A/S	19/06/2024	9:37:31 AM	1,776.0000	8	XCSE

156

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:37:31 AM	1,776.0000	8	CEUX
Genmab A/S	19/06/2024	9:37:31 AM	1,776.0000	8	CEUX
Genmab A/S	19/06/2024	9:37:31 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	9:37:44 AM	1,776.0000	8	XCSE
Genmab A/S	19/06/2024	9:37:48 AM	1,776.0000	8	XCSE
Genmab A/S	19/06/2024	9:37:48 AM	1,776.0000	8	XCSE
Genmab A/S	19/06/2024	9:37:48 AM	1,776.0000	8	XCSE
Genmab A/S	19/06/2024	9:38:07 AM	1,776.0000	8	XCSE
Genmab A/S	19/06/2024	9:38:07 AM	1,776.0000	42	XCSE
Genmab A/S	19/06/2024	9:38:07 AM	1,776.0000	64	XCSE
Genmab A/S	19/06/2024	9:38:07 AM	1,776.0000	8	XCSE
Genmab A/S	19/06/2024	9:38:07 AM	1,776.0000	8	XCSE
Genmab A/S	19/06/2024	9:38:07 AM	1,776.0000	3	XCSE
Genmab A/S	19/06/2024	9:38:27 AM	1,777.0000	26	XCSE
Genmab A/S	19/06/2024	9:38:27 AM	1,777.0000	26	XCSE
Genmab A/S	19/06/2024	9:38:27 AM	1,777.0000	25	XCSE
Genmab A/S	19/06/2024	9:38:28 AM	1,777.0000	26	XCSE
Genmab A/S	19/06/2024	9:38:28 AM	1,777.0000	26	XCSE
Genmab A/S	19/06/2024	9:38:28 AM	1,777.0000	2	AQEU
Genmab A/S	19/06/2024	9:38:28 AM	1,777.0000	5	TQEX
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	12	CEUX
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	8	CEUX
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	8	CEUX
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	12	CEUX
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	3	AQEU
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	3	AQEU
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	3	AQEU
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	3	AQEU
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	3	AQEU
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	9:38:28 AM	1,776.0000	22	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.5000	17	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.5000	48	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.5000	10	AQEU
Genmab A/S	19/06/2024	9:39:21 AM	1,775.5000	10	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.5000	72	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	21	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	21	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	21	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	21	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	21	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	3	XCSE

157

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	18	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	21	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	1	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	7	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	7	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	7	XCSE
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	36	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	6	CEUX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	9	AQEU
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	9	TQEX
Genmab A/S	19/06/2024	9:39:21 AM	1,775.0000	4	XCSE
Genmab A/S	19/06/2024	9:40:45 AM	1,776.5000	5	XCSE
Genmab A/S	19/06/2024	9:42:37 AM	1,778.5000	5	XCSE
Genmab A/S	19/06/2024	9:42:37 AM	1,778.5000	6	XCSE
Genmab A/S	19/06/2024	9:42:37 AM	1,778.5000	4	XCSE
Genmab A/S	19/06/2024	9:42:37 AM	1,778.5000	9	XCSE
Genmab A/S	19/06/2024	9:42:37 AM	1,778.5000	16	XCSE
Genmab A/S	19/06/2024	9:42:52 AM	1,778.5000	1	AQEU
Genmab A/S	19/06/2024	9:42:52 AM	1,778.5000	37	XCSE
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	35	XCSE
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	35	XCSE
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	3	XCSE
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	5	XCSE
Genmab A/S	19/06/2024	9:43:10 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	9:43:51 AM	1,778.5000	20	CEUX
Genmab A/S	19/06/2024	9:43:51 AM	1,778.5000	12	CEUX
Genmab A/S	19/06/2024	9:43:51 AM	1,778.5000	7	TQEX
Genmab A/S	19/06/2024	9:43:56 AM	1,778.0000	2	AQEU
Genmab A/S	19/06/2024	9:44:06 AM	1,778.5000	15	TQEX
Genmab A/S	19/06/2024	9:44:54 AM	1,779.0000	10	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	22	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	88	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	69	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	22	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	29	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	43	XCSE
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	21	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	47	CEUX

158

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	94	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	21	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	21	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	9	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	2	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	CEUX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	10	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	22	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	11	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	6	TQEX
Genmab A/S	19/06/2024	9:45:23 AM	1,779.5000	6	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,778.0000	50	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,778.0000	40	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,778.0000	36	CEUX
Genmab A/S	19/06/2024	9:46:06 AM	1,778.0000	50	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,778.0000	2	CEUX
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	50	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	2	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	43	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	30	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	45	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	7	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	43	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	36	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	9	XCSE
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	36	CEUX
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	9	AQEU
Genmab A/S	19/06/2024	9:46:06 AM	1,777.5000	28	CEUX
Genmab A/S	19/06/2024	9:50:49 AM	1,775.5000	24	XCSE
Genmab A/S	19/06/2024	9:50:49 AM	1,775.5000	24	XCSE
Genmab A/S	19/06/2024	9:50:49 AM	1,775.5000	132	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	47	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	49	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	47	XCSE

159

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	3	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	46	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	78	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	21	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	46	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	41	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	9	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	34	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	34	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	7	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	43	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,775.0000	1	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	41	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	9	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	34	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	34	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	7	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	18	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	14	XCSE
Genmab A/S	19/06/2024	9:50:50 AM	1,774.5000	9	XCSE
Genmab A/S	19/06/2024	9:56:22 AM	1,777.0000	13	CEUX
Genmab A/S	19/06/2024	9:56:22 AM	1,777.0000	13	CEUX
Genmab A/S	19/06/2024	9:56:22 AM	1,777.0000	1	AQEU
Genmab A/S	19/06/2024	9:56:22 AM	1,777.0000	5	TQEX
Genmab A/S	19/06/2024	9:56:22 AM	1,777.0000	10	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	3	AQEU
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	27	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	30	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	3	AQEU
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	14	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	21	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	3	AQEU
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	3	AQEU

160

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	19	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	9	AQEU
Genmab A/S	19/06/2024	9:57:08 AM	1,780.0000	9	AQEU
Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	20	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	13	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	7	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	7	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,779.5000	14	XCSE
Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	19	CEUX
Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	5	TQEX
Genmab A/S	19/06/2024	9:57:08 AM	1,779.0000	26	TQEX
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	15	CEUX
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	2	AQEU
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	2	AQEU
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	5	TQEX
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	36	CEUX
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	2	AQEU
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	2	AQEU
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	5	TQEX
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	10	XCSE
Genmab A/S	19/06/2024	9:57:09 AM	1,779.0000	7	CEUX
Genmab A/S	19/06/2024	9:57:10 AM	1,778.5000	13	CEUX
Genmab A/S	19/06/2024	9:57:10 AM	1,778.5000	7	CEUX
Genmab A/S	19/06/2024	9:57:10 AM	1,778.5000	7	CEUX
Genmab A/S	19/06/2024	9:57:10 AM	1,778.5000	3	AQEU
Genmab A/S	19/06/2024	9:57:10 AM	1,778.5000	22	XCSE
Genmab A/S	19/06/2024	10:01:51 AM	1,780.5000	9	TQEX
Genmab A/S	19/06/2024	10:01:51 AM	1,780.5000	27	TQEX
Genmab A/S	19/06/2024	10:01:51 AM	1,780.0000	14	CEUX
Genmab A/S	19/06/2024	10:01:51 AM	1,780.0000	117	CEUX
Genmab A/S	19/06/2024	10:01:51 AM	1,780.0000	19	AQEU
Genmab A/S	19/06/2024	10:01:51 AM	1,780.0000	20	TQEX
Genmab A/S	19/06/2024	10:01:51 AM	1,780.0000	98	XCSE
Genmab A/S	19/06/2024	10:01:51 AM	1,780.0000	48	XCSE
Genmab A/S	19/06/2024	10:01:51 AM	1,779.5000	44	XCSE
Genmab A/S	19/06/2024	10:01:51 AM	1,779.5000	10	CEUX
Genmab A/S	19/06/2024	10:01:51 AM	1,779.5000	3	XCSE
Genmab A/S	19/06/2024	10:01:51 AM	1,779.5000	33	XCSE
Genmab A/S	19/06/2024	10:04:05 AM	1,778.0000	87	CEUX
Genmab A/S	19/06/2024	10:04:05 AM	1,778.0000	13	AQEU
Genmab A/S	19/06/2024	10:04:05 AM	1,778.0000	13	TQEX
Genmab A/S	19/06/2024	10:04:05 AM	1,778.0000	50	XCSE
Genmab A/S	19/06/2024	10:04:05 AM	1,778.0000	47	XCSE
Genmab A/S	19/06/2024	10:04:05 AM	1,777.5000	5	XCSE
Genmab A/S	19/06/2024	10:04:05 AM	1,777.5000	12	XCSE
Genmab A/S	19/06/2024	10:04:05 AM	1,777.5000	2	CEUX
Genmab A/S	19/06/2024	10:04:05 AM	1,777.5000	9	CEUX
Genmab A/S	19/06/2024	10:04:05 AM	1,777.5000	2	CEUX
Genmab A/S	19/06/2024	10:06:54 AM	1,778.0000	8	TQEX

161

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:06:54 AM	1,778.0000	8	TQEX
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	14	CEUX
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	33	CEUX
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	35	CEUX
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	29	CEUX
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	7	AQEU
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	7	TQEX
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	7	TQEX
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	51	XCSE
Genmab A/S	19/06/2024	10:07:35 AM	1,777.5000	15	CEUX
Genmab A/S	19/06/2024	10:07:44 AM	1,777.0000	49	XCSE
Genmab A/S	19/06/2024	10:08:35 AM	1,781.5000	50	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.5000	93	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.5000	150	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	22	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	27	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	3	AQEU
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	20	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	21	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	21	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	21	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	10	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	15	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	3	AQEU
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	5	TQEX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	5	TQEX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	5	TQEX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	10	CEUX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	5	TQEX
Genmab A/S	19/06/2024	10:08:35 AM	1,781.0000	22	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	22	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	9	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	13	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	3	AQEU
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	23	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	14	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	11	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	20	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	20	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	3	AQEU
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	22	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	22	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	22	XCSE

162

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	22	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	22	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	22	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	11	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	37	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	30	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,780.0000	1	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	20	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	20	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	20	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	20	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	3	AQEU
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	10	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	36	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,779.0000	52	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.0000	52	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.0000	38	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.5000	25	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,779.0000	7	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	23	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	21	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	21	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	3	AQEU
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	3	AQEU
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	21	CEUX
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	3	AQEU
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	23	XCSE
Genmab A/S	19/06/2024	10:11:12 AM	1,778.5000	23	XCSE
Genmab A/S	19/06/2024	10:11:14 AM	1,778.5000	17	CEUX
Genmab A/S	19/06/2024	10:11:14 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:11:14 AM	1,778.5000	19	XCSE
Genmab A/S	19/06/2024	10:11:14 AM	1,778.5000	3	CEUX
Genmab A/S	19/06/2024	10:11:14 AM	1,778.5000	3	AQEU
Genmab A/S	19/06/2024	10:11:14 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:17:11 AM	1,775.5000	15	XCSE
Genmab A/S	19/06/2024	10:17:35 AM	1,775.0000	21	CEUX
Genmab A/S	19/06/2024	10:17:35 AM	1,775.0000	2	AQEU
Genmab A/S	19/06/2024	10:17:35 AM	1,775.0000	5	TQEX
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	18	CEUX
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	1	CEUX
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	5	TQEX

163

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	20	XCSE
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	13	XCSE
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	7	XCSE
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	6	XCSE
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	19	CEUX
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	19	CEUX
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:17:44 AM	1,774.5000	20	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	64	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	58	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	51	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	36	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	9	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	9	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	9	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	2	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	7	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	34	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	21	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	20	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	25	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	20	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	5	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	20	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	16	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	20	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	20	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	18	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	20	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	19	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	20	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.5000	20	XCSE
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	6	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	9	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	9	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	9	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,772.5000	21	CEUX
Genmab A/S	19/06/2024	10:19:39 AM	1,772.5000	2	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,772.5000	2	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,772.5000	2	AQEU
Genmab A/S	19/06/2024	10:19:39 AM	1,772.5000	5	TQEX
Genmab A/S	19/06/2024	10:19:39 AM	1,773.0000	19	XCSE

164

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:19:39 AM	1,772.5000	21	XCSE
Genmab A/S	19/06/2024	10:24:04 AM	1,774.0000	108	CEUX
Genmab A/S	19/06/2024	10:24:04 AM	1,774.0000	16	AQEU
Genmab A/S	19/06/2024	10:24:04 AM	1,774.0000	16	TQEX
Genmab A/S	19/06/2024	10:24:04 AM	1,774.0000	19	XCSE
Genmab A/S	19/06/2024	10:26:27 AM	1,775.0000	38	XCSE
Genmab A/S	19/06/2024	10:26:44 AM	1,775.0000	8	XCSE
Genmab A/S	19/06/2024	10:26:44 AM	1,775.0000	31	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	58	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	50	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	8	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	58	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	2	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	6	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	9	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	9	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	64	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	6	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	58	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	64	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	6	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	9	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	64	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	4	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	4	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	9	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	29	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	19	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	58	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	4	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	8	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	9	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	2	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	9	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	64	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,774.0000	20	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	4	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	11	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	5	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	11	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	20	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	19	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	2	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	6	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	13	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	9	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	2	AQEU

165

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	10	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	4	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	15	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	4	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	11	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	10	TQEX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	20	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	1	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.5000	28	XCSE
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	36	CEUX
Genmab A/S	19/06/2024	10:26:45 AM	1,773.0000	1	CEUX
Genmab A/S	19/06/2024	10:26:46 AM	1,772.5000	2	AQEU
Genmab A/S	19/06/2024	10:26:46 AM	1,772.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	7	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	2	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	7	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	2	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	1	AQEU
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	2	AQEU
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	4	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	1	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	4	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	6	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	2	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX

166

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	1	AQEU
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	3	TQEX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	30	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	8	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	5	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	3	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	44	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	CEUX
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	23	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	23	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	23	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	14	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	23	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	23	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	23	XCSE
Genmab A/S	19/06/2024	10:32:40 AM	1,774.5000	9	XCSE
Genmab A/S	19/06/2024	10:34:26 AM	1,774.5000	8	CEUX
Genmab A/S	19/06/2024	10:34:26 AM	1,774.5000	4	TQEX
Genmab A/S	19/06/2024	10:34:26 AM	1,774.5000	8	CEUX
Genmab A/S	19/06/2024	10:34:26 AM	1,774.5000	1	AQEU
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	7	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	6	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	6	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	1	AQEU
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	1	AQEU
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX

167

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	5	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	25	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	39	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	4	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	2	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	2	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	3	TQEX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	1	AQEU
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	4	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	4	XCSE
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	CEUX
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	1	AQEU
Genmab A/S	19/06/2024	10:36:59 AM	1,778.5000	8	XCSE
Genmab A/S	19/06/2024	10:37:51 AM	1,777.0000	21	XCSE
Genmab A/S	19/06/2024	10:37:51 AM	1,777.0000	21	XCSE
Genmab A/S	19/06/2024	10:39:53 AM	1,778.0000	47	AQEU
Genmab A/S	19/06/2024	10:40:29 AM	1,777.5000	20	CEUX
Genmab A/S	19/06/2024	10:40:29 AM	1,777.5000	14	CEUX
Genmab A/S	19/06/2024	10:40:29 AM	1,777.5000	1	CEUX

168

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:40:46 AM	1,778.0000	2	AQEU
Genmab A/S	19/06/2024	10:40:46 AM	1,778.0000	9	AQEU
Genmab A/S	19/06/2024	10:40:49 AM	1,778.0000	2	AQEU
Genmab A/S	19/06/2024	10:40:49 AM	1,778.0000	9	AQEU
Genmab A/S	19/06/2024	10:40:54 AM	1,778.0000	2	AQEU
Genmab A/S	19/06/2024	10:40:54 AM	1,778.0000	9	AQEU
Genmab A/S	19/06/2024	10:40:58 AM	1,778.0000	2	AQEU
Genmab A/S	19/06/2024	10:40:58 AM	1,778.0000	9	AQEU
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	20	XCSE
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	2	XCSE
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	20	CEUX
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	20	CEUX
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	3	AQEU
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	2	AQEU
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	2	AQEU
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	5	TQEX
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	22	XCSE
Genmab A/S	19/06/2024	10:41:00 AM	1,777.0000	25	XCSE
Genmab A/S	19/06/2024	10:41:02 AM	1,777.0000	20	CEUX
Genmab A/S	19/06/2024	10:41:02 AM	1,777.0000	5	TQEX
Genmab A/S	19/06/2024	10:41:02 AM	1,777.0000	20	CEUX
Genmab A/S	19/06/2024	10:41:02 AM	1,777.0000	22	XCSE
Genmab A/S	19/06/2024	10:41:02 AM	1,777.0000	20	CEUX
Genmab A/S	19/06/2024	10:42:35 AM	1,776.5000	3	CEUX
Genmab A/S	19/06/2024	10:42:35 AM	1,776.5000	33	CEUX
Genmab A/S	19/06/2024	10:42:52 AM	1,776.5000	12	CEUX
Genmab A/S	19/06/2024	10:42:52 AM	1,776.5000	25	TQEX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	20	CEUX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	2	AQEU
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	20	CEUX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	4	CEUX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	20	CEUX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	2	AQEU
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	5	TQEX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	5	TQEX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	37	XCSE
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	21	XCSE
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	21	XCSE
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	4	XCSE
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	21	XCSE
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	12	CEUX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	2	AQEU
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	3	AQEU
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	5	TQEX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	5	TQEX
Genmab A/S	19/06/2024	10:43:15 AM	1,776.5000	48	XCSE
Genmab A/S	19/06/2024	10:43:48 AM	1,776.5000	9	CEUX
Genmab A/S	19/06/2024	10:43:48 AM	1,776.5000	5	TQEX
Genmab A/S	19/06/2024	10:43:48 AM	1,776.5000	5	TQEX

169

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:43:48 AM	1,776.5000	9	XCSE
Genmab A/S	19/06/2024	10:43:48 AM	1,776.5000	9	XCSE
Genmab A/S	19/06/2024	10:44:48 AM	1,776.0000	5	XCSE
Genmab A/S	19/06/2024	10:45:10 AM	1,776.5000	38	CEUX
Genmab A/S	19/06/2024	10:45:25 AM	1,776.5000	24	CEUX
Genmab A/S	19/06/2024	10:45:45 AM	1,776.5000	11	CEUX
Genmab A/S	19/06/2024	10:45:45 AM	1,776.5000	8	AQEU
Genmab A/S	19/06/2024	10:45:45 AM	1,776.5000	8	TQEX
Genmab A/S	19/06/2024	10:45:53 AM	1,776.5000	3	CEUX
Genmab A/S	19/06/2024	10:46:11 AM	1,776.5000	59	XCSE
Genmab A/S	19/06/2024	10:46:11 AM	1,776.5000	23	XCSE
Genmab A/S	19/06/2024	10:46:11 AM	1,776.5000	59	XCSE
Genmab A/S	19/06/2024	10:46:11 AM	1,776.5000	18	XCSE
Genmab A/S	19/06/2024	10:46:15 AM	1,776.5000	8	AQEU
Genmab A/S	19/06/2024	10:46:15 AM	1,776.5000	8	TQEX
Genmab A/S	19/06/2024	10:46:15 AM	1,776.5000	15	XCSE
Genmab A/S	19/06/2024	10:46:39 AM	1,776.5000	48	CEUX
Genmab A/S	19/06/2024	10:46:39 AM	1,776.5000	6	CEUX
Genmab A/S	19/06/2024	10:46:39 AM	1,776.5000	8	TQEX
Genmab A/S	19/06/2024	10:46:39 AM	1,776.5000	8	AQEU
Genmab A/S	19/06/2024	10:46:39 AM	1,776.5000	44	XCSE
Genmab A/S	19/06/2024	10:46:39 AM	1,776.5000	23	CEUX
Genmab A/S	19/06/2024	10:46:39 AM	1,776.5000	19	XCSE
Genmab A/S	19/06/2024	10:46:40 AM	1,776.5000	19	XCSE
Genmab A/S	19/06/2024	10:46:40 AM	1,776.5000	11	XCSE
Genmab A/S	19/06/2024	10:46:40 AM	1,776.5000	54	XCSE
Genmab A/S	19/06/2024	10:46:40 AM	1,776.5000	25	XCSE
Genmab A/S	19/06/2024	10:46:40 AM	1,776.5000	67	XCSE
Genmab A/S	19/06/2024	10:46:40 AM	1,776.5000	42	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	14	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	6	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	38	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	20	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	20	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	20	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	20	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	13	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	20	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	11	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU

170

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	5	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	21	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	40	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	21	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	78	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	4	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	21	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	11	XCSE
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	36	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	9	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	2	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	9	AQEU
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	10	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	6	TQEX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	48	CEUX
Genmab A/S	19/06/2024	10:46:42 AM	1,776.0000	10	XCSE
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	21	XCSE
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	28	XCSE
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	21	CEUX
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	5	CEUX
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	20	CEUX
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	3	TQEX
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	2	XCSE
Genmab A/S	19/06/2024	10:48:47 AM	1,773.0000	72	XCSE
Genmab A/S	19/06/2024	10:54:49 AM	1,772.5000	16	TQEX
Genmab A/S	19/06/2024	10:57:00 AM	1,773.5000	15	CEUX
Genmab A/S	19/06/2024	10:57:00 AM	1,773.5000	15	CEUX
Genmab A/S	19/06/2024	10:57:00 AM	1,773.5000	2	CEUX
Genmab A/S	19/06/2024	10:57:00 AM	1,773.5000	5	XCSE
Genmab A/S	19/06/2024	10:57:03 AM	1,773.0000	8	XCSE
Genmab A/S	19/06/2024	10:57:12 AM	1,773.0000	8	XCSE
Genmab A/S	19/06/2024	10:57:25 AM	1,773.5000	18	CEUX
Genmab A/S	19/06/2024	10:57:51 AM	1,773.5000	68	XCSE
Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	323	CEUX
Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	108	CEUX
Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	58	AQEU
Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	2	AQEU
Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	67	TQEX
Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	74	XCSE

171

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	110	XCSE
Genmab A/S	19/06/2024	10:57:51 AM	1,773.0000	298	XCSE
Genmab A/S	19/06/2024	11:03:30 AM	1,768.5000	1	XCSE
Genmab A/S	19/06/2024	11:03:30 AM	1,768.5000	20	XCSE
Genmab A/S	19/06/2024	11:03:30 AM	1,768.5000	18	XCSE
Genmab A/S	19/06/2024	11:03:30 AM	1,768.5000	21	CEUX
Genmab A/S	19/06/2024	11:03:30 AM	1,768.5000	18	CEUX
Genmab A/S	19/06/2024	11:03:30 AM	1,768.5000	5	TQEX
Genmab A/S	19/06/2024	11:03:30 AM	1,768.5000	5	TQEX
Genmab A/S	19/06/2024	11:06:11 AM	1,770.5000	7	XCSE
Genmab A/S	19/06/2024	11:06:58 AM	1,771.5000	18	XCSE
Genmab A/S	19/06/2024	11:06:58 AM	1,771.5000	8	XCSE
Genmab A/S	19/06/2024	11:06:58 AM	1,771.5000	9	XCSE
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	5	XCSE
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	14	XCSE
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	103	XCSE
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	26	XCSE
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	91	XCSE
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	26	XCSE
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	92	CEUX
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	15	TQEX
Genmab A/S	19/06/2024	11:07:05 AM	1,770.5000	13	CEUX
Genmab A/S	19/06/2024	11:10:18 AM	1,771.5000	10	AQEU
Genmab A/S	19/06/2024	11:10:23 AM	1,772.0000	19	CEUX
Genmab A/S	19/06/2024	11:10:23 AM	1,772.0000	18	CEUX
Genmab A/S	19/06/2024	11:10:48 AM	1,771.5000	36	CEUX
Genmab A/S	19/06/2024	11:10:48 AM	1,771.5000	17	XCSE
Genmab A/S	19/06/2024	11:10:48 AM	1,771.5000	17	CEUX
Genmab A/S	19/06/2024	11:11:19 AM	1,773.5000	35	XCSE
Genmab A/S	19/06/2024	11:12:04 AM	1,773.5000	72	XCSE
Genmab A/S	19/06/2024	11:12:04 AM	1,773.0000	301	XCSE
Genmab A/S	19/06/2024	11:12:04 AM	1,773.0000	10	CEUX
Genmab A/S	19/06/2024	11:12:04 AM	1,773.0000	84	CEUX
Genmab A/S	19/06/2024	11:12:04 AM	1,773.0000	7	TQEX
Genmab A/S	19/06/2024	11:12:04 AM	1,773.0000	3	AQEU
Genmab A/S	19/06/2024	11:13:05 AM	1,773.0000	10	CEUX
Genmab A/S	19/06/2024	11:13:05 AM	1,773.0000	5	CEUX
Genmab A/S	19/06/2024	11:13:05 AM	1,773.0000	1	AQEU
Genmab A/S	19/06/2024	11:13:05 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:13:05 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:13:05 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:14:08 AM	1,772.5000	91	CEUX
Genmab A/S	19/06/2024	11:14:08 AM	1,772.5000	11	TQEX
Genmab A/S	19/06/2024	11:14:08 AM	1,772.5000	103	XCSE
Genmab A/S	19/06/2024	11:14:08 AM	1,772.5000	4	XCSE
Genmab A/S	19/06/2024	11:14:08 AM	1,772.5000	4	TQEX
Genmab A/S	19/06/2024	11:14:08 AM	1,772.5000	18	TQEX
Genmab A/S	19/06/2024	11:15:39 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:15:39 AM	1,773.0000	55	XCSE

172

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:16:55 AM	1,773.0000	1	AQEU
Genmab A/S	19/06/2024	11:16:55 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:16:55 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:16:55 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:17:06 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	1	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	12	CEUX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	5	TQEX
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:37 AM	1,773.0000	3	XCSE
Genmab A/S	19/06/2024	11:17:38 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:38 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:17:42 AM	1,771.5000	18	CEUX
Genmab A/S	19/06/2024	11:17:42 AM	1,771.5000	19	XCSE
Genmab A/S	19/06/2024	11:17:42 AM	1,771.5000	5	TQEX
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	8	CEUX
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	8	XCSE
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	8	XCSE
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	8	CEUX
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	1	AQEU
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	8	XCSE
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	2	XCSE
Genmab A/S	19/06/2024	11:19:26 AM	1,770.5000	8	CEUX

173

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:21:41 AM	1,771.5000	36	CEUX
Genmab A/S	19/06/2024	11:21:41 AM	1,771.5000	2	AQEU
Genmab A/S	19/06/2024	11:22:01 AM	1,771.5000	30	XCSE
Genmab A/S	19/06/2024	11:22:01 AM	1,771.5000	5	XCSE
Genmab A/S	19/06/2024	11:22:10 AM	1,771.5000	8	CEUX
Genmab A/S	19/06/2024	11:22:10 AM	1,771.5000	12	CEUX
Genmab A/S	19/06/2024	11:22:10 AM	1,771.5000	19	CEUX
Genmab A/S	19/06/2024	11:22:32 AM	1,772.0000	15	TQEX
Genmab A/S	19/06/2024	11:22:32 AM	1,772.0000	6	TQEX
Genmab A/S	19/06/2024	11:22:32 AM	1,772.0000	6	TQEX
Genmab A/S	19/06/2024	11:22:32 AM	1,772.0000	6	TQEX
Genmab A/S	19/06/2024	11:22:52 AM	1,772.0000	34	XCSE
Genmab A/S	19/06/2024	11:23:09 AM	1,772.0000	36	XCSE
Genmab A/S	19/06/2024	11:23:26 AM	1,772.0000	17	CEUX
Genmab A/S	19/06/2024	11:23:26 AM	1,772.0000	2	AQEU
Genmab A/S	19/06/2024	11:23:26 AM	1,772.0000	9	AQEU
Genmab A/S	19/06/2024	11:23:26 AM	1,772.0000	9	TQEX
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	3	CEUX
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	6	CEUX
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	9	CEUX
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	5	TQEX
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	8	XCSE
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	9	CEUX
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	7	CEUX
Genmab A/S	19/06/2024	11:23:37 AM	1,771.0000	2	CEUX
Genmab A/S	19/06/2024	11:24:10 AM	1,771.0000	3	CEUX
Genmab A/S	19/06/2024	11:24:10 AM	1,771.0000	23	CEUX
Genmab A/S	19/06/2024	11:24:10 AM	1,771.0000	8	XCSE
Genmab A/S	19/06/2024	11:24:10 AM	1,771.0000	3	XCSE
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	4	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	20	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	17	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	20	XCSE
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	5	XCSE
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	24	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	24	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	13	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	24	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	2	AQEU

174

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	10	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	14	CEUX
Genmab A/S	19/06/2024	11:24:18 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	11	XCSE
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	8	CEUX
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	6	CEUX
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	36	CEUX
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	9	AQEU
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	10	TQEX
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	30	XCSE
Genmab A/S	19/06/2024	11:24:19 AM	1,770.5000	24	XCSE
Genmab A/S	19/06/2024	11:26:30 AM	1,772.0000	9	XCSE
Genmab A/S	19/06/2024	11:26:30 AM	1,772.0000	96	XCSE
Genmab A/S	19/06/2024	11:26:30 AM	1,772.0000	74	CEUX
Genmab A/S	19/06/2024	11:26:30 AM	1,772.0000	14	TQEX
Genmab A/S	19/06/2024	11:26:30 AM	1,772.0000	20	CEUX
Genmab A/S	19/06/2024	11:29:23 AM	1,771.0000	16	CEUX
Genmab A/S	19/06/2024	11:29:23 AM	1,771.0000	79	CEUX
Genmab A/S	19/06/2024	11:29:23 AM	1,771.0000	99	CEUX
Genmab A/S	19/06/2024	11:29:23 AM	1,771.0000	9	CEUX
Genmab A/S	19/06/2024	11:29:23 AM	1,771.0000	14	TQEX
Genmab A/S	19/06/2024	11:29:23 AM	1,771.0000	6	TQEX
Genmab A/S	19/06/2024	11:29:23 AM	1,771.0000	14	XCSE
Genmab A/S	19/06/2024	11:31:25 AM	1,773.0000	7	TQEX
Genmab A/S	19/06/2024	11:31:25 AM	1,773.0000	15	TQEX
Genmab A/S	19/06/2024	11:31:25 AM	1,773.0000	10	XCSE
Genmab A/S	19/06/2024	11:31:25 AM	1,773.0000	2	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	7	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	4	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	2	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	3	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	8	CEUX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	5	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	5	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	6	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	5	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	7	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	31	XCSE

175

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	7	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	7	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	29	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	31	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	1	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	36	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	5	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	5	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	3	TQEX
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	20	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	1	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	20	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	1	XCSE
Genmab A/S	19/06/2024	11:31:44 AM	1,772.0000	4	CEUX
Genmab A/S	19/06/2024	11:31:45 AM	1,771.5000	5	TQEX
Genmab A/S	19/06/2024	11:31:45 AM	1,771.5000	2	TQEX
Genmab A/S	19/06/2024	11:31:45 AM	1,771.5000	3	TQEX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	8	CEUX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	10	CEUX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	15	CEUX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	5	CEUX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	18	CEUX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	20	CEUX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	3	CEUX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	2	AQEU
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	2	AQEU
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	2	AQEU
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	2	AQEU
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	5	TQEX
Genmab A/S	19/06/2024	11:31:46 AM	1,771.5000	5	TQEX
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	15	CEUX
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	2	CEUX
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	9	CEUX
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	2	TQEX
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	8	XCSE
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	11	XCSE
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	21	XCSE
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	19	XCSE
Genmab A/S	19/06/2024	11:31:49 AM	1,771.5000	21	XCSE
Genmab A/S	19/06/2024	11:32:15 AM	1,771.0000	8	CEUX
Genmab A/S	19/06/2024	11:32:15 AM	1,771.0000	1	AQEU
Genmab A/S	19/06/2024	11:32:15 AM	1,771.0000	5	TQEX
Genmab A/S	19/06/2024	11:36:22 AM	1,771.5000	9	CEUX
Genmab A/S	19/06/2024	11:36:22 AM	1,771.5000	25	CEUX
Genmab A/S	19/06/2024	11:36:22 AM	1,771.5000	4	TQEX
Genmab A/S	19/06/2024	11:36:46 AM	1,771.5000	36	CEUX
Genmab A/S	19/06/2024	11:37:08 AM	1,771.5000	15	CEUX
Genmab A/S	19/06/2024	11:37:08 AM	1,771.5000	9	CEUX
Genmab A/S	19/06/2024	11:37:08 AM	1,771.5000	5	CEUX

176

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:37:08 AM	1,771.5000	1	XCSE
Genmab A/S	19/06/2024	11:37:08 AM	1,771.5000	9	XCSE
Genmab A/S	19/06/2024	11:37:25 AM	1,771.5000	14	CEUX
Genmab A/S	19/06/2024	11:37:25 AM	1,771.5000	6	CEUX
Genmab A/S	19/06/2024	11:37:25 AM	1,771.5000	16	CEUX
Genmab A/S	19/06/2024	11:37:25 AM	1,771.5000	1	CEUX
Genmab A/S	19/06/2024	11:37:25 AM	1,771.5000	3	TQEX
Genmab A/S	19/06/2024	11:37:49 AM	1,771.5000	6	CEUX
Genmab A/S	19/06/2024	11:37:49 AM	1,771.5000	31	CEUX
Genmab A/S	19/06/2024	11:38:04 AM	1,771.5000	6	CEUX
Genmab A/S	19/06/2024	11:38:04 AM	1,771.5000	13	CEUX
Genmab A/S	19/06/2024	11:38:04 AM	1,771.5000	10	CEUX
Genmab A/S	19/06/2024	11:38:04 AM	1,771.5000	6	CEUX
Genmab A/S	19/06/2024	11:38:27 AM	1,771.5000	2	CEUX
Genmab A/S	19/06/2024	11:38:27 AM	1,771.5000	10	CEUX
Genmab A/S	19/06/2024	11:38:27 AM	1,771.5000	14	CEUX
Genmab A/S	19/06/2024	11:38:27 AM	1,771.5000	5	CEUX
Genmab A/S	19/06/2024	11:38:27 AM	1,771.5000	5	CEUX
Genmab A/S	19/06/2024	11:38:44 AM	1,771.5000	13	CEUX
Genmab A/S	19/06/2024	11:38:44 AM	1,771.5000	10	CEUX
Genmab A/S	19/06/2024	11:38:44 AM	1,771.5000	3	CEUX
Genmab A/S	19/06/2024	11:38:44 AM	1,771.5000	5	TQEX
Genmab A/S	19/06/2024	11:38:44 AM	1,771.5000	9	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	60	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	15	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	40	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	24	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	4	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	50	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	18	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	28	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	40	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	35	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	10	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	10	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	2	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	4	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	6	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	4	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	2	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	4	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	10	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	3	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	7	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	3	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	7	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	4	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	3	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	38	XCSE

177

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:38:45 AM	1,770.5000	20	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	19	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	20	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	50	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	1	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	39	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	19	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	19	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	2	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	2	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	2	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	19	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	19	CEUX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	38	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	2	AQEU
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	26	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	18	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	19	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	25	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	2	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	3	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	13	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	1	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	11	TQEX
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	2	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	22	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	5	XCSE
Genmab A/S	19/06/2024	11:38:45 AM	1,770.0000	13	CEUX
Genmab A/S	19/06/2024	11:43:34 AM	1,767.5000	19	CEUX
Genmab A/S	19/06/2024	11:43:34 AM	1,767.5000	5	TQEX
Genmab A/S	19/06/2024	11:43:34 AM	1,767.5000	19	XCSE
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	10	CEUX
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	11	CEUX
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	10	CEUX
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	3	AQEU
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	3	AQEU
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	3	AQEU
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	5	TQEX
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	22	XCSE
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	26	XCSE
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	5	XCSE
Genmab A/S	19/06/2024	11:43:40 AM	1,766.5000	20	XCSE
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	20	CEUX
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	3	AQEU
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	5	TQEX

178

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	36	CEUX
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	9	AQEU
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	9	TQEX
Genmab A/S	19/06/2024	11:43:40 AM	1,767.0000	16	XCSE
Genmab A/S	19/06/2024	11:46:57 AM	1,769.0000	26	CEUX
Genmab A/S	19/06/2024	11:46:57 AM	1,769.0000	26	CEUX
Genmab A/S	19/06/2024	11:46:57 AM	1,769.0000	4	AQEU
Genmab A/S	19/06/2024	11:46:57 AM	1,769.0000	2	AQEU
Genmab A/S	19/06/2024	11:46:57 AM	1,769.0000	5	TQEX
Genmab A/S	19/06/2024	11:46:57 AM	1,769.0000	4	TQEX
Genmab A/S	19/06/2024	11:47:31 AM	1,768.5000	26	XCSE
Genmab A/S	19/06/2024	11:47:31 AM	1,768.5000	25	XCSE
Genmab A/S	19/06/2024	11:47:31 AM	1,768.5000	26	XCSE
Genmab A/S	19/06/2024	11:47:31 AM	1,768.5000	36	CEUX
Genmab A/S	19/06/2024	11:47:31 AM	1,768.5000	9	AQEU
Genmab A/S	19/06/2024	11:47:31 AM	1,768.5000	10	TQEX
Genmab A/S	19/06/2024	11:47:31 AM	1,768.5000	14	XCSE
Genmab A/S	19/06/2024	11:47:31 AM	1,768.0000	19	CEUX
Genmab A/S	19/06/2024	11:51:21 AM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	11:51:21 AM	1,771.0000	9	AQEU
Genmab A/S	19/06/2024	11:51:21 AM	1,771.0000	14	TQEX
Genmab A/S	19/06/2024	11:51:21 AM	1,771.0000	11	XCSE
Genmab A/S	19/06/2024	11:51:45 AM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	11:51:45 AM	1,771.0000	9	AQEU
Genmab A/S	19/06/2024	11:51:45 AM	1,771.0000	9	TQEX
Genmab A/S	19/06/2024	11:51:45 AM	1,771.0000	14	XCSE
Genmab A/S	19/06/2024	11:52:00 AM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	11:52:00 AM	1,771.0000	12	XCSE
Genmab A/S	19/06/2024	11:52:00 AM	1,771.0000	20	XCSE
Genmab A/S	19/06/2024	11:52:19 AM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	11:52:19 AM	1,771.0000	17	XCSE
Genmab A/S	19/06/2024	11:52:19 AM	1,771.0000	12	XCSE
Genmab A/S	19/06/2024	11:52:19 AM	1,771.0000	5	XCSE
Genmab A/S	19/06/2024	11:52:39 AM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	11:52:39 AM	1,771.0000	20	AQEU
Genmab A/S	19/06/2024	11:52:39 AM	1,771.0000	16	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	57	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	57	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	2	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	55	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	2	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	19	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	52	CEUX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	3	CEUX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	49	CEUX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	8	TQEX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	8	TQEX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	40	CEUX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	12	CEUX

179

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	39	CEUX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	6	TQEX
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	43	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	20	CEUX
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	15	CEUX
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	6	AQEU
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	5	TQEX
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	6	TQEX
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	21	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,769.5000	13	XCSE
Genmab A/S	19/06/2024	11:53:19 AM	1,770.0000	6	XCSE
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	20	CEUX
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	21	XCSE
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	11	XCSE
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	5	CEUX
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	5	TQEX
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	5	TQEX
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	48	XCSE
Genmab A/S	19/06/2024	11:53:20 AM	1,769.5000	9	XCSE
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	19	CEUX
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	19	CEUX
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	3	CEUX
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	2	AQEU
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	3	AQEU
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	5	TQEX
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	3	TQEX
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	19	XCSE
Genmab A/S	19/06/2024	11:56:05 AM	1,767.0000	31	XCSE
Genmab A/S	19/06/2024	11:56:20 AM	1,766.5000	19	XCSE
Genmab A/S	19/06/2024	11:58:59 AM	1,767.5000	3	CEUX
Genmab A/S	19/06/2024	12:00:11 PM	1,768.5000	6	CEUX
Genmab A/S	19/06/2024	12:00:11 PM	1,768.5000	11	CEUX
Genmab A/S	19/06/2024	12:00:11 PM	1,768.5000	5	TQEX
Genmab A/S	19/06/2024	12:00:11 PM	1,768.5000	18	XCSE
Genmab A/S	19/06/2024	12:00:11 PM	1,768.5000	11	CEUX
Genmab A/S	19/06/2024	12:00:11 PM	1,768.5000	5	TQEX
Genmab A/S	19/06/2024	12:00:11 PM	1,768.5000	18	XCSE
Genmab A/S	19/06/2024	12:01:06 PM	1,769.0000	2	AQEU
Genmab A/S	19/06/2024	12:01:06 PM	1,769.0000	30	XCSE
Genmab A/S	19/06/2024	12:01:06 PM	1,769.0000	2	XCSE
Genmab A/S	19/06/2024	12:01:18 PM	1,768.5000	35	XCSE
Genmab A/S	19/06/2024	12:02:36 PM	1,769.0000	44	XCSE
Genmab A/S	19/06/2024	12:02:36 PM	1,769.0000	44	XCSE
Genmab A/S	19/06/2024	12:02:36 PM	1,769.0000	16	XCSE
Genmab A/S	19/06/2024	12:02:36 PM	1,769.0000	1	XCSE

180

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	72	CEUX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	2	CEUX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	72	CEUX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	3	CEUX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	22	CEUX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	10	AQEU
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	10	AQEU
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	10	AQEU
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	11	TQEX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	10	AQEU
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	11	TQEX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	3	TQEX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	11	TQEX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	11	TQEX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	79	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	3	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	79	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	27	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	4	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	10	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	4	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	18	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	17	CEUX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	2	AQEU
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	5	TQEX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.5000	5	XCSE
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	10	CEUX
Genmab A/S	19/06/2024	12:02:58 PM	1,768.0000	18	XCSE
Genmab A/S	19/06/2024	12:03:01 PM	1,768.0000	10	XCSE
Genmab A/S	19/06/2024	12:03:01 PM	1,768.0000	7	CEUX
Genmab A/S	19/06/2024	12:03:01 PM	1,768.0000	7	CEUX
Genmab A/S	19/06/2024	12:03:01 PM	1,768.0000	5	TQEX
Genmab A/S	19/06/2024	12:03:01 PM	1,768.0000	5	TQEX
Genmab A/S	19/06/2024	12:03:01 PM	1,768.0000	21	XCSE
Genmab A/S	19/06/2024	12:03:01 PM	1,768.0000	36	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,769.0000	21	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,769.0000	84	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,769.0000	15	AQEU
Genmab A/S	19/06/2024	12:07:55 PM	1,769.0000	16	TQEX
Genmab A/S	19/06/2024	12:07:55 PM	1,769.0000	117	XCSE
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	4	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	6	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	99	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	3	AQEU
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	16	TQEX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	121	XCSE
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	4	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	8	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	4	CEUX

181

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	3	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	12	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	19	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	19	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	3	AQEU
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	5	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.5000	8	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	21	XCSE
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	19	XCSE
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	19	CEUX
Genmab A/S	19/06/2024	12:07:55 PM	1,768.0000	14	CEUX
Genmab A/S	19/06/2024	12:12:29 PM	1,769.5000	93	XCSE
Genmab A/S	19/06/2024	12:12:29 PM	1,769.5000	12	TQEX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	8	XCSE
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	9	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	9	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	9	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	9	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	9	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	9	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	2	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	1	AQEU
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	1	AQEU
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	5	TQEX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	2	AQEU
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	8	XCSE
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	25	XCSE
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	8	XCSE
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	8	XCSE
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	5	XCSE
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	20	CEUX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	20	TQEX
Genmab A/S	19/06/2024	12:14:22 PM	1,770.5000	23	CEUX
Genmab A/S	19/06/2024	12:14:26 PM	1,770.5000	5	CEUX
Genmab A/S	19/06/2024	12:15:55 PM	1,769.5000	4	TQEX
Genmab A/S	19/06/2024	12:17:53 PM	1,770.5000	36	XCSE
Genmab A/S	19/06/2024	12:17:53 PM	1,770.5000	4	XCSE
Genmab A/S	19/06/2024	12:18:16 PM	1,771.0000	16	XCSE
Genmab A/S	19/06/2024	12:18:16 PM	1,771.0000	19	XCSE
Genmab A/S	19/06/2024	12:18:36 PM	1,771.0000	12	XCSE
Genmab A/S	19/06/2024	12:18:36 PM	1,771.0000	25	XCSE
Genmab A/S	19/06/2024	12:18:59 PM	1,770.5000	36	TQEX
Genmab A/S	19/06/2024	12:19:21 PM	1,770.5000	35	AQEU
Genmab A/S	19/06/2024	12:19:38 PM	1,770.5000	24	CEUX
Genmab A/S	19/06/2024	12:19:38 PM	1,770.5000	14	CEUX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	8	CEUX

182

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	80	CEUX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	8	CEUX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	3	CEUX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	8	CEUX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	5	CEUX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	8	XCSE
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	8	XCSE
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	23	XCSE
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	8	CEUX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	8	XCSE
Genmab A/S	19/06/2024	12:19:45 PM	1,770.0000	16	XCSE
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	47	CEUX
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	50	CEUX
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	20	CEUX
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	15	AQEU
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	16	TQEX
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	2	TQEX
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	27	XCSE
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	104	XCSE
Genmab A/S	19/06/2024	12:20:58 PM	1,769.0000	2	CEUX
Genmab A/S	19/06/2024	12:20:58 PM	1,768.5000	5	TQEX
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	17	CEUX
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	22	CEUX
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	2	AQEU
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	3	AQEU
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	17	XCSE
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	23	XCSE
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	17	CEUX
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	22	CEUX
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	2	AQEU
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	3	AQEU
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	5	TQEX
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	11	CEUX
Genmab A/S	19/06/2024	12:21:02 PM	1,768.5000	5	TQEX
Genmab A/S	19/06/2024	12:24:15 PM	1,767.5000	9	XCSE
Genmab A/S	19/06/2024	12:25:16 PM	1,767.5000	10	CEUX
Genmab A/S	19/06/2024	12:26:31 PM	1,769.0000	28	CEUX
Genmab A/S	19/06/2024	12:26:31 PM	1,769.0000	12	XCSE
Genmab A/S	19/06/2024	12:26:31 PM	1,769.0000	1	XCSE
Genmab A/S	19/06/2024	12:26:57 PM	1,769.0000	2	AQEU
Genmab A/S	19/06/2024	12:26:57 PM	1,769.0000	9	AQEU
Genmab A/S	19/06/2024	12:26:57 PM	1,769.0000	9	TQEX
Genmab A/S	19/06/2024	12:26:57 PM	1,769.0000	17	XCSE
Genmab A/S	19/06/2024	12:26:57 PM	1,769.0000	2	XCSE
Genmab A/S	19/06/2024	12:27:13 PM	1,769.0000	2	AQEU

183

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:27:13 PM	1,769.0000	11	XCSE
Genmab A/S	19/06/2024	12:27:13 PM	1,769.0000	25	XCSE
Genmab A/S	19/06/2024	12:27:36 PM	1,769.0000	6	CEUX
Genmab A/S	19/06/2024	12:27:36 PM	1,769.0000	9	CEUX
Genmab A/S	19/06/2024	12:27:36 PM	1,769.0000	21	CEUX
Genmab A/S	19/06/2024	12:27:37 PM	1,768.0000	3	CEUX
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	9	CEUX
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	10	CEUX
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	12	CEUX
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	3	CEUX
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	2	AQEU
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	2	AQEU
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	2	AQEU
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	2	AQEU
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	12	XCSE
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	11	XCSE
Genmab A/S	19/06/2024	12:27:38 PM	1,768.0000	6	CEUX
Genmab A/S	19/06/2024	12:28:43 PM	1,768.5000	12	TQEX
Genmab A/S	19/06/2024	12:28:43 PM	1,768.5000	6	TQEX
Genmab A/S	19/06/2024	12:28:59 PM	1,768.0000	35	CEUX
Genmab A/S	19/06/2024	12:28:59 PM	1,768.0000	2	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	71	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	43	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	35	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	8	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	22	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	8	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	32	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	6	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	3	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	9	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	2	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	9	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	9	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	2	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	5	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	10	TQEX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	10	TQEX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	7	TQEX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.5000	20	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	24	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	23	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	25	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	17	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	14	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	16	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	23	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	6	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	19	XCSE

184

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	25	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	31	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	4	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	21	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	2	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	20	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	22	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	21	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	21	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	22	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	22	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	8	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	13	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	22	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	11	CEUX
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	3	AQEU
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	45	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	45	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	30	XCSE
Genmab A/S	19/06/2024	12:29:05 PM	1,767.0000	12	XCSE
Genmab A/S	19/06/2024	12:35:13 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	12:35:13 PM	1,765.5000	5	TQEX
Genmab A/S	19/06/2024	12:35:13 PM	1,765.5000	5	TQEX

185

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Issuer Date Time CEST Price (DKK) Quantity Venue

Genmab A/S	19/06/2024	12:35:13 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:35:13 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:35:13 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	9	CEUX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	9	CEUX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	2	CEUX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	1	AQEU
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	5	TQEX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	1	TQEX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	8	XCSE
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	38	XCSE
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	7	CEUX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	2	CEUX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	1	TQEX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	4	TQEX
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	36	CEUX
Genmab A/S	19/06/2024	12:36:09 PM	1,764.5000	2	XCSE
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	39	XCSE
Genmab A/S	19/06/2024	12:36:09 PM	1,765.0000	21	XCSE
Genmab A/S	19/06/2024	12:39:31 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:31 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	2	CEUX
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:37 PM	1,765.5000	9	CEUX
Genmab A/S	19/06/2024	12:39:40 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	7	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	5	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	6	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	1	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	38	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX

1

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	10	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	1	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:39:42 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:41:07 PM	1,764.5000	22	XCSE
Genmab A/S	19/06/2024	12:41:07 PM	1,764.5000	43	XCSE
Genmab A/S	19/06/2024	12:43:48 PM	1,765.0000	70	XCSE
Genmab A/S	19/06/2024	12:43:48 PM	1,765.0000	45	XCSE
Genmab A/S	19/06/2024	12:43:48 PM	1,765.0000	63	CEUX
Genmab A/S	19/06/2024	12:43:48 PM	1,765.0000	41	CEUX
Genmab A/S	19/06/2024	12:43:48 PM	1,765.0000	10	TQEX
Genmab A/S	19/06/2024	12:43:48 PM	1,765.0000	6	TQEX
Genmab A/S	19/06/2024	12:45:39 PM	1,765.5000	20	XCSE
Genmab A/S	19/06/2024	12:45:39 PM	1,765.5000	87	XCSE
Genmab A/S	19/06/2024	12:45:39 PM	1,765.5000	95	CEUX
Genmab A/S	19/06/2024	12:45:39 PM	1,765.5000	14	AQEU
Genmab A/S	19/06/2024	12:45:39 PM	1,765.5000	15	TQEX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	8	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	3	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE

2

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	30	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	3	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	9	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	6	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	11	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	9	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	9	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	9	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,765.5000	5	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	21	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	3	AQEU
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	5	TQEX
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	8	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	14	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	36	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	10	XCSE
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	21	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	15	CEUX
Genmab A/S	19/06/2024	12:48:43 PM	1,764.5000	12	XCSE
Genmab A/S	19/06/2024	12:48:44 PM	1,764.5000	34	XCSE
Genmab A/S	19/06/2024	12:48:44 PM	1,764.5000	9	XCSE
Genmab A/S	19/06/2024	12:48:44 PM	1,764.5000	42	XCSE
Genmab A/S	19/06/2024	12:48:44 PM	1,764.5000	15	XCSE
Genmab A/S	19/06/2024	12:51:21 PM	1,762.5000	65	XCSE
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	20	XCSE
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	9	XCSE
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	11	XCSE
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	9	XCSE
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	5	XCSE

3

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	20	CEUX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	20	CEUX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	11	CEUX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	5	TQEX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	5	TQEX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	2	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	36	CEUX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	5	CEUX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	9	AQEU
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	9	TQEX
Genmab A/S	19/06/2024	12:51:21 PM	1,762.0000	7	XCSE
Genmab A/S	19/06/2024	12:56:47 PM	1,764.0000	21	XCSE
Genmab A/S	19/06/2024	12:58:17 PM	1,764.5000	80	CEUX
Genmab A/S	19/06/2024	12:58:23 PM	1,764.5000	12	TQEX
Genmab A/S	19/06/2024	12:58:23 PM	1,764.5000	89	XCSE
Genmab A/S	19/06/2024	12:58:23 PM	1,764.5000	12	TQEX
Genmab A/S	19/06/2024	1:01:21 PM	1,766.0000	1	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	3	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	3	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	36	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	9	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	28	XCSE

4

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	15	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	28	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.5000	7	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	50	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	25	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	35	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	11	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	4	CEUX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	12	TQEX
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	45	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	39	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	35	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	20	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	73	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	39	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	21	XCSE
Genmab A/S	19/06/2024	1:01:37 PM	1,765.0000	2	AQEU
Genmab A/S	19/06/2024	1:04:27 PM	1,763.5000	29	XCSE
Genmab A/S	19/06/2024	1:04:27 PM	1,763.5000	18	XCSE
Genmab A/S	19/06/2024	1:04:27 PM	1,763.5000	18	XCSE
Genmab A/S	19/06/2024	1:04:27 PM	1,763.5000	15	CEUX
Genmab A/S	19/06/2024	1:04:27 PM	1,763.5000	15	TQEX
Genmab A/S	19/06/2024	1:05:59 PM	1,765.0000	15	XCSE
Genmab A/S	19/06/2024	1:09:25 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:09:25 PM	1,765.5000	7	XCSE
Genmab A/S	19/06/2024	1:10:28 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:10:28 PM	1,765.5000	87	XCSE
Genmab A/S	19/06/2024	1:10:28 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	1:10:28 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:10:28 PM	1,765.5000	13	CEUX
Genmab A/S	19/06/2024	1:10:45 PM	1,765.5000	10	XCSE
Genmab A/S	19/06/2024	1:10:45 PM	1,765.5000	55	XCSE
Genmab A/S	19/06/2024	1:10:55 PM	1,765.5000	5	CEUX
Genmab A/S	19/06/2024	1:10:55 PM	1,765.5000	5	TQEX
Genmab A/S	19/06/2024	1:11:03 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	1:11:03 PM	1,765.5000	43	XCSE
Genmab A/S	19/06/2024	1:11:03 PM	1,765.5000	7	CEUX
Genmab A/S	19/06/2024	1:11:03 PM	1,765.5000	38	XCSE
Genmab A/S	19/06/2024	1:11:03 PM	1,765.5000	26	XCSE

5

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	1:11:06 PM	1,765.5000	16	XCSE
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	21	XCSE
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	20	XCSE
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	21	XCSE
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	20	XCSE
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	1:11:13 PM	1,765.0000	9	AQEU
Genmab A/S	19/06/2024	1:15:14 PM	1,766.5000	50	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.5000	56	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.5000	15	AQEU
Genmab A/S	19/06/2024	1:15:14 PM	1,766.5000	16	TQEX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.5000	61	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.5000	57	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	21	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	20	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	18	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	18	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	2	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	8	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	3	AQEU
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	3	AQEU
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	21	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	20	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	21	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	20	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	20	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	7	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	11	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	3	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	8	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	35	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	14	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	25	XCSE
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	6	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	18	CEUX
Genmab A/S	19/06/2024	1:15:14 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	46	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	26	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	19	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	46	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	4	XCSE

6

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	22	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	46	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	22	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	14	XCSE
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	23	CEUX
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	23	CEUX
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	13	CEUX
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	4	AQEU
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	4	AQEU
Genmab A/S	19/06/2024	1:19:00 PM	1,763.0000	37	CEUX
Genmab A/S	19/06/2024	1:25:56 PM	1,761.5000	88	XCSE
Genmab A/S	19/06/2024	1:28:09 PM	1,764.0000	40	XCSE
Genmab A/S	19/06/2024	1:28:19 PM	1,764.0000	20	CEUX
Genmab A/S	19/06/2024	1:28:19 PM	1,764.0000	2	CEUX
Genmab A/S	19/06/2024	1:28:19 PM	1,764.0000	10	XCSE
Genmab A/S	19/06/2024	1:28:19 PM	1,764.0000	2	XCSE
Genmab A/S	19/06/2024	1:28:45 PM	1,764.0000	9	CEUX
Genmab A/S	19/06/2024	1:28:47 PM	1,764.0000	8	CEUX
Genmab A/S	19/06/2024	1:28:52 PM	1,764.0000	8	CEUX
Genmab A/S	19/06/2024	1:28:57 PM	1,764.0000	1	CEUX
Genmab A/S	19/06/2024	1:32:32 PM	1,764.5000	12	XCSE
Genmab A/S	19/06/2024	1:33:07 PM	1,765.0000	13	XCSE
Genmab A/S	19/06/2024	1:33:07 PM	1,765.0000	9	XCSE
Genmab A/S	19/06/2024	1:33:07 PM	1,765.0000	13	XCSE
Genmab A/S	19/06/2024	1:33:08 PM	1,764.5000	12	XCSE
Genmab A/S	19/06/2024	1:33:35 PM	1,764.5000	2	CEUX
Genmab A/S	19/06/2024	1:33:45 PM	1,764.5000	10	XCSE
Genmab A/S	19/06/2024	1:34:19 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:19 PM	1,766.0000	16	AQEU
Genmab A/S	19/06/2024	1:34:19 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:19 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:20 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:20 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:20 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:20 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:21 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:22 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:22 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:23 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:23 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:24 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:24 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:26 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:26 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:27 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:27 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:27 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:34:28 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:30 PM	1,766.0000	2	AQEU

7

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	1:35:31 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:31 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:31 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:31 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:32 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:33 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:33 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:34 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:34 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:34 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:35 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:35 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:35 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:36 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:36 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:36 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:37 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:37 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:37 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:37 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:37 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:38 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:38 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:40 PM	1,766.0000	9	AQEU
Genmab A/S	19/06/2024	1:35:40 PM	1,766.0000	2	AQEU
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	43	CEUX
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	24	CEUX
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	19	CEUX
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	14	XCSE
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	34	XCSE
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	39	XCSE
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	48	XCSE
Genmab A/S	19/06/2024	1:35:57 PM	1,765.5000	8	XCSE
Genmab A/S	19/06/2024	1:36:53 PM	1,766.0000	23	XCSE
Genmab A/S	19/06/2024	1:36:53 PM	1,766.0000	45	XCSE
Genmab A/S	19/06/2024	1:37:01 PM	1,766.0000	45	XCSE
Genmab A/S	19/06/2024	1:37:01 PM	1,766.0000	21	XCSE
Genmab A/S	19/06/2024	1:37:16 PM	1,767.0000	8	CEUX
Genmab A/S	19/06/2024	1:37:26 PM	1,766.5000	41	CEUX
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	23	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	46	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	22	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	22	CEUX
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	41	CEUX
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	3	AQEU
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	6	AQEU
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	1	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	46	XCSE

8

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	23	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	27	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	19	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	23	XCSE
Genmab A/S	19/06/2024	1:39:05 PM	1,767.0000	4	XCSE
Genmab A/S	19/06/2024	1:39:07 PM	1,769.0000	9	CEUX
Genmab A/S	19/06/2024	1:39:07 PM	1,769.0000	14	XCSE
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	46	XCSE
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	10	CEUX
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	47	CEUX
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	9	CEUX
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	46	XCSE
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	14	XCSE
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	32	XCSE
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	14	XCSE
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	44	XCSE
Genmab A/S	19/06/2024	1:39:32 PM	1,769.5000	3	XCSE
Genmab A/S	19/06/2024	1:41:00 PM	1,769.5000	20	CEUX
Genmab A/S	19/06/2024	1:41:00 PM	1,769.5000	9	CEUX
Genmab A/S	19/06/2024	1:41:00 PM	1,769.5000	1	CEUX
Genmab A/S	19/06/2024	1:41:00 PM	1,769.5000	8	CEUX
Genmab A/S	19/06/2024	1:41:00 PM	1,769.5000	1	AQEU
Genmab A/S	19/06/2024	1:41:13 PM	1,769.5000	6	AQEU
Genmab A/S	19/06/2024	1:41:13 PM	1,769.5000	25	XCSE
Genmab A/S	19/06/2024	1:41:13 PM	1,769.5000	8	XCSE
Genmab A/S	19/06/2024	1:41:38 PM	1,769.5000	4	AQEU
Genmab A/S	19/06/2024	1:41:38 PM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	1:41:38 PM	1,769.5000	12	TQEX
Genmab A/S	19/06/2024	1:41:38 PM	1,769.5000	16	TQEX
Genmab A/S	19/06/2024	1:41:38 PM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	1:42:01 PM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	1:42:01 PM	1,769.5000	16	TQEX
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	51	CEUX
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	7	AQEU
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	3	CEUX
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	48	CEUX
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	55	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	55	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	38	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	21	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	34	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	9	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	14	CEUX
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	12	CEUX
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	8	CEUX
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	7	AQEU
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	7	AQEU
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	17	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	30	XCSE

9

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	1:43:40 PM	1,769.0000	32	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,768.0000	3	AQEU
Genmab A/S	19/06/2024	1:43:40 PM	1,768.0000	3	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,768.0000	20	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,768.0000	20	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,768.0000	3	XCSE
Genmab A/S	19/06/2024	1:43:40 PM	1,768.0000	45	XCSE
Genmab A/S	19/06/2024	1:48:17 PM	1,769.5000	20	XCSE
Genmab A/S	19/06/2024	1:48:28 PM	1,769.5000	35	CEUX
Genmab A/S	19/06/2024	1:48:28 PM	1,769.5000	36	CEUX
Genmab A/S	19/06/2024	1:48:28 PM	1,769.5000	10	CEUX
Genmab A/S	19/06/2024	1:48:28 PM	1,769.5000	19	XCSE
Genmab A/S	19/06/2024	1:48:28 PM	1,769.5000	52	XCSE
Genmab A/S	19/06/2024	1:48:28 PM	1,769.5000	35	CEUX
Genmab A/S	19/06/2024	1:48:28 PM	1,769.5000	39	XCSE
Genmab A/S	19/06/2024	1:48:47 PM	1,769.5000	39	XCSE
Genmab A/S	19/06/2024	1:48:47 PM	1,769.5000	35	CEUX
Genmab A/S	19/06/2024	1:49:55 PM	1,769.0000	45	XCSE
Genmab A/S	19/06/2024	1:49:55 PM	1,769.0000	24	XCSE
Genmab A/S	19/06/2024	1:49:55 PM	1,769.0000	62	XCSE
Genmab A/S	19/06/2024	1:49:55 PM	1,769.5000	39	XCSE
Genmab A/S	19/06/2024	1:49:55 PM	1,769.5000	105	XCSE
Genmab A/S	19/06/2024	1:49:55 PM	1,769.5000	35	CEUX
Genmab A/S	19/06/2024	1:52:33 PM	1,770.0000	19	CEUX
Genmab A/S	19/06/2024	1:52:33 PM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	1:52:33 PM	1,770.0000	20	XCSE
Genmab A/S	19/06/2024	1:52:33 PM	1,770.0000	25	XCSE
Genmab A/S	19/06/2024	1:52:33 PM	1,770.0000	19	CEUX
Genmab A/S	19/06/2024	1:52:33 PM	1,770.0000	5	TQEX
Genmab A/S	19/06/2024	1:54:38 PM	1,771.0000	10	CEUX
Genmab A/S	19/06/2024	1:54:38 PM	1,771.0000	2	CEUX
Genmab A/S	19/06/2024	1:54:38 PM	1,771.0000	10	XCSE
Genmab A/S	19/06/2024	1:55:40 PM	1,771.0000	21	CEUX
Genmab A/S	19/06/2024	1:55:40 PM	1,771.0000	2	CEUX
Genmab A/S	19/06/2024	1:55:40 PM	1,771.0000	9	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	36	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	14	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	46	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	60	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	7	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	30	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	16	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	16	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	30	XCSE
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	6	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	6	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	6	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	6	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	6	AQEU

10

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	6	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	6	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	3	AQEU
Genmab A/S	19/06/2024	1:56:22 PM	1,771.0000	17	CEUX
Genmab A/S	19/06/2024	1:56:22 PM	1,770.5000	26	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,770.0000	14	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,770.0000	5	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,770.0000	61	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	33	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	33	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	5	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	3	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	3	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	31	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	7	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	38	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	19	XCSE
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	33	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	5	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	AQEU
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	2	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	16	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	4	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	11	CEUX
Genmab A/S	19/06/2024	1:58:32 PM	1,769.5000	4	CEUX
Genmab A/S	19/06/2024	2:01:05 PM	1,769.5000	12	XCSE
Genmab A/S	19/06/2024	2:01:05 PM	1,769.5000	11	CEUX
Genmab A/S	19/06/2024	2:01:05 PM	1,769.5000	1	CEUX
Genmab A/S	19/06/2024	2:01:05 PM	1,769.5000	12	CEUX
Genmab A/S	19/06/2024	2:01:05 PM	1,769.5000	2	CEUX
Genmab A/S	19/06/2024	2:01:32 PM	1,769.5000	4	XCSE
Genmab A/S	19/06/2024	2:01:32 PM	1,769.5000	33	XCSE
Genmab A/S	19/06/2024	2:01:49 PM	1,769.5000	3	CEUX
Genmab A/S	19/06/2024	2:01:49 PM	1,769.5000	11	CEUX
Genmab A/S	19/06/2024	2:01:49 PM	1,769.5000	1	CEUX
Genmab A/S	19/06/2024	2:01:49 PM	1,769.5000	3	AQEU
Genmab A/S	19/06/2024	2:01:49 PM	1,769.5000	20	AQEU
Genmab A/S	19/06/2024	2:02:16 PM	1,769.0000	51	CEUX
Genmab A/S	19/06/2024	2:03:15 PM	1,769.5000	9	AQEU
Genmab A/S	19/06/2024	2:03:20 PM	1,769.0000	57	XCSE
Genmab A/S	19/06/2024	2:03:20 PM	1,769.0000	57	XCSE
Genmab A/S	19/06/2024	2:03:20 PM	1,769.0000	51	CEUX

11

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:03:20 PM	1,769.0000	51	CEUX
Genmab A/S	19/06/2024	2:03:20 PM	1,769.0000	8	AQEU
Genmab A/S	19/06/2024	2:07:27 PM	1,770.5000	45	XCSE
Genmab A/S	19/06/2024	2:07:27 PM	1,770.5000	44	XCSE
Genmab A/S	19/06/2024	2:07:27 PM	1,770.5000	21	XCSE
Genmab A/S	19/06/2024	2:07:38 PM	1,770.5000	35	XCSE
Genmab A/S	19/06/2024	2:08:09 PM	1,771.0000	4	XCSE
Genmab A/S	19/06/2024	2:08:09 PM	1,771.0000	30	XCSE
Genmab A/S	19/06/2024	2:08:09 PM	1,771.0000	9	XCSE
Genmab A/S	19/06/2024	2:08:10 PM	1,771.0000	13	AQEU
Genmab A/S	19/06/2024	2:08:10 PM	1,771.0000	16	CEUX
Genmab A/S	19/06/2024	2:08:10 PM	1,771.0000	4	CEUX
Genmab A/S	19/06/2024	2:08:10 PM	1,771.0000	3	AQEU
Genmab A/S	19/06/2024	2:08:10 PM	1,771.0000	5	TQEX
Genmab A/S	19/06/2024	2:08:10 PM	1,771.0000	22	XCSE
Genmab A/S	19/06/2024	2:08:10 PM	1,771.0000	5	XCSE
Genmab A/S	19/06/2024	2:08:35 PM	1,771.0000	46	XCSE
Genmab A/S	19/06/2024	2:08:35 PM	1,771.0000	23	CEUX
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	36	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	10	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	68	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	3	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	9	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	39	CEUX
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	1	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	4	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	42	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	33	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	19	XCSE
Genmab A/S	19/06/2024	2:10:35 PM	1,771.0000	24	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	16	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	13	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	14	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	28	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	28	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	38	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	50	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	9	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	5	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU

12

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	7	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	7	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	7	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	7	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	3	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	28	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	13	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	4	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	2	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	13	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	12	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	13	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	13	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	23	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	38	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	74	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	27	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,771.0000	17	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	15	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	6	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	21	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	6	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	15	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	3	AQEU
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	21	CEUX
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	23	XCSE
Genmab A/S	19/06/2024	2:10:45 PM	1,770.5000	12	XCSE
Genmab A/S	19/06/2024	2:10:46 PM	1,770.5000	21	CEUX
Genmab A/S	19/06/2024	2:10:46 PM	1,770.5000	2	CEUX
Genmab A/S	19/06/2024	2:10:46 PM	1,770.5000	3	AQEU

13

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:10:46 PM	1,770.5000	23	XCSE
Genmab A/S	19/06/2024	2:10:46 PM	1,770.5000	33	CEUX
Genmab A/S	19/06/2024	2:15:53 PM	1,767.0000	25	CEUX
Genmab A/S	19/06/2024	2:15:53 PM	1,767.0000	25	XCSE
Genmab A/S	19/06/2024	2:15:53 PM	1,767.0000	28	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	8	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	46	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	46	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	8	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	38	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	8	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	5	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	4	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	4	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	4	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	4	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	4	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	8	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	8	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	8	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	37	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	9	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	13	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	9	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	30	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	39	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,767.0000	38	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	20	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	20	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	18	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	18	CEUX
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	3	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	3	AQEU
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	20	XCSE
Genmab A/S	19/06/2024	2:16:26 PM	1,766.5000	18	CEUX
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	18	CEUX
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	20	XCSE
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	18	XCSE
Genmab A/S	19/06/2024	2:16:27 PM	1,767.0000	1	XCSE
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	16	CEUX
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	3	AQEU
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	3	AQEU
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	3	AQEU
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	3	AQEU
Genmab A/S	19/06/2024	2:16:27 PM	1,766.5000	27	CEUX
Genmab A/S	19/06/2024	2:21:50 PM	1,766.0000	1	CEUX
Genmab A/S	19/06/2024	2:21:50 PM	1,766.0000	9	CEUX
Genmab A/S	19/06/2024	2:23:06 PM	1,766.0000	32	XCSE
Genmab A/S	19/06/2024	2:24:31 PM	1,767.0000	6	CEUX

14

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:24:31 PM	1,767.0000	12	XCSE
Genmab A/S	19/06/2024	2:24:44 PM	1,767.0000	5	CEUX
Genmab A/S	19/06/2024	2:24:44 PM	1,767.0000	15	CEUX
Genmab A/S	19/06/2024	2:24:44 PM	1,767.0000	11	XCSE
Genmab A/S	19/06/2024	2:26:01 PM	1,767.0000	18	XCSE
Genmab A/S	19/06/2024	2:26:09 PM	1,766.5000	1	CEUX
Genmab A/S	19/06/2024	2:26:14 PM	1,766.5000	10	XCSE
Genmab A/S	19/06/2024	2:26:14 PM	1,766.5000	9	CEUX
Genmab A/S	19/06/2024	2:26:14 PM	1,766.5000	10	CEUX
Genmab A/S	19/06/2024	2:26:14 PM	1,766.5000	10	XCSE
Genmab A/S	19/06/2024	2:27:03 PM	1,767.0000	36	CEUX
Genmab A/S	19/06/2024	2:27:03 PM	1,767.0000	3	CEUX
Genmab A/S	19/06/2024	2:27:03 PM	1,767.0000	25	XCSE
Genmab A/S	19/06/2024	2:27:04 PM	1,767.0000	36	CEUX
Genmab A/S	19/06/2024	2:27:04 PM	1,767.0000	14	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	52	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	23	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	29	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	29	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	10	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	8	AQEU
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	8	AQEU
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	57	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	1	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	26	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	32	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	26	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	32	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	58	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	13	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	36	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	3	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	8	AQEU
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	43	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	13	CEUX
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	72	XCSE
Genmab A/S	19/06/2024	2:28:30 PM	1,766.5000	12	XCSE
Genmab A/S	19/06/2024	2:29:31 PM	1,764.5000	19	CEUX
Genmab A/S	19/06/2024	2:29:31 PM	1,764.5000	12	CEUX
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	19	CEUX
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	3	AQEU
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	3	AQEU
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	3	AQEU
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	6	XCSE
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	14	XCSE
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	74	XCSE
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	19	CEUX
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	3	AQEU
Genmab A/S	19/06/2024	2:29:44 PM	1,764.5000	19	CEUX

15

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:31:04 PM	1,765.0000	48	CEUX
Genmab A/S	19/06/2024	2:31:04 PM	1,765.0000	36	CEUX
Genmab A/S	19/06/2024	2:31:04 PM	1,765.0000	20	CEUX
Genmab A/S	19/06/2024	2:31:04 PM	1,765.0000	6	CEUX
Genmab A/S	19/06/2024	2:31:04 PM	1,765.0000	25	XCSE
Genmab A/S	19/06/2024	2:31:04 PM	1,765.0000	49	CEUX
Genmab A/S	19/06/2024	2:33:18 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	2:33:18 PM	1,764.5000	32	XCSE
Genmab A/S	19/06/2024	2:33:37 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	2:33:37 PM	1,764.5000	92	XCSE
Genmab A/S	19/06/2024	2:34:45 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	31	XCSE
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	30	CEUX
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	30	CEUX
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	3	CEUX
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	30	CEUX
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	3	AQEU
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	2:35:38 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	2:36:50 PM	1,765.0000	40	XCSE
Genmab A/S	19/06/2024	2:37:38 PM	1,765.5000	10	TQEX
Genmab A/S	19/06/2024	2:37:38 PM	1,765.5000	6	TQEX
Genmab A/S	19/06/2024	2:37:38 PM	1,765.5000	11	TQEX
Genmab A/S	19/06/2024	2:37:51 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	2:38:05 PM	1,766.0000	8	TQEX
Genmab A/S	19/06/2024	2:38:05 PM	1,766.0000	9	TQEX
Genmab A/S	19/06/2024	2:39:26 PM	1,766.0000	6	CEUX
Genmab A/S	19/06/2024	2:39:26 PM	1,766.0000	6	CEUX
Genmab A/S	19/06/2024	2:39:27 PM	1,766.0000	5	CEUX
Genmab A/S	19/06/2024	2:39:27 PM	1,766.0000	5	CEUX
Genmab A/S	19/06/2024	2:39:28 PM	1,766.0000	5	CEUX
Genmab A/S	19/06/2024	2:39:28 PM	1,766.0000	6	CEUX
Genmab A/S	19/06/2024	2:39:28 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	2:39:28 PM	1,765.5000	47	XCSE
Genmab A/S	19/06/2024	2:39:28 PM	1,765.5000	12	CEUX
Genmab A/S	19/06/2024	2:39:28 PM	1,766.0000	9	TQEX
Genmab A/S	19/06/2024	2:39:36 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	2:40:28 PM	1,765.5000	12	CEUX
Genmab A/S	19/06/2024	2:40:28 PM	1,765.5000	2	AQEU
Genmab A/S	19/06/2024	2:40:28 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	2:40:28 PM	1,765.5000	11	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	43	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	14	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	49	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	49	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	19	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	6	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	9	CEUX

16

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	20	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	9	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	53	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	50	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	3	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	50	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	1	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	17	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.5000	3	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	6	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	10	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	20	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	17	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	26	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	33	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	58	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	33	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	26	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	7	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	26	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	59	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	39	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	20	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	12	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	47	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	17	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	36	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	17	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	30	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	23	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	53	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	59	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	48	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,764.5000	5	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	53	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	3	CEUX
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:40:45 PM	1,765.0000	8	AQEU

17

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:40:45 PM	1,763.5000	22	XCSE
Genmab A/S	19/06/2024	2:40:45 PM	1,763.5000	18	XCSE
Genmab A/S	19/06/2024	2:40:46 PM	1,763.5000	20	CEUX
Genmab A/S	19/06/2024	2:40:46 PM	1,763.5000	18	CEUX
Genmab A/S	19/06/2024	2:40:46 PM	1,763.5000	22	XCSE
Genmab A/S	19/06/2024	2:40:46 PM	1,763.5000	16	XCSE
Genmab A/S	19/06/2024	2:40:52 PM	1,763.5000	4	CEUX
Genmab A/S	19/06/2024	2:40:52 PM	1,763.5000	16	CEUX
Genmab A/S	19/06/2024	2:40:52 PM	1,763.5000	22	XCSE
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	20	XCSE
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	20	XCSE
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	10	XCSE
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	19	CEUX
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	19	CEUX
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	14	CEUX
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	19	CEUX
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	14	CEUX
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	3	AQEU
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	3	AQEU
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	7	XCSE
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	13	XCSE
Genmab A/S	19/06/2024	2:44:49 PM	1,763.5000	10	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	20	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	20	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	19	CEUX
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	8	CEUX
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	19	CEUX
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	3	AQEU
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	8	AQEU
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	3	AQEU
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	20	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	12	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	23	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	23	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	23	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	7	CEUX
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	3	AQEU
Genmab A/S	19/06/2024	2:44:50 PM	1,763.5000	22	CEUX
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	9	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	5	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	12	CEUX
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	3	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	3	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	3	XCSE
Genmab A/S	19/06/2024	2:44:50 PM	1,763.0000	46	XCSE
Genmab A/S	19/06/2024	2:50:37 PM	1,764.0000	55	XCSE
Genmab A/S	19/06/2024	2:50:37 PM	1,764.0000	13	XCSE
Genmab A/S	19/06/2024	2:50:37 PM	1,764.0000	29	XCSE
Genmab A/S	19/06/2024	2:52:44 PM	1,765.0000	62	CEUX

18

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:52:44 PM	1,765.0000	16	CEUX
Genmab A/S	19/06/2024	2:52:44 PM	1,765.0000	56	CEUX
Genmab A/S	19/06/2024	2:52:44 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:52:44 PM	1,765.0000	39	XCSE
Genmab A/S	19/06/2024	2:52:44 PM	1,765.0000	23	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	25	CEUX
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	62	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	62	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	26	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	31	CEUX
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	46	CEUX
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	10	CEUX
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	8	AQEU
Genmab A/S	19/06/2024	2:52:56 PM	1,764.5000	13	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,764.5000	13	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	38	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,765.0000	14	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,764.5000	13	XCSE
Genmab A/S	19/06/2024	2:52:56 PM	1,764.5000	13	XCSE
Genmab A/S	19/06/2024	2:55:06 PM	1,765.5000	44	XCSE
Genmab A/S	19/06/2024	2:55:06 PM	1,765.5000	39	CEUX
Genmab A/S	19/06/2024	2:55:40 PM	1,766.0000	123	CEUX
Genmab A/S	19/06/2024	2:55:40 PM	1,766.0000	17	CEUX
Genmab A/S	19/06/2024	2:55:40 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	2:56:11 PM	1,765.5000	10	XCSE
Genmab A/S	19/06/2024	2:56:11 PM	1,765.5000	9	CEUX
Genmab A/S	19/06/2024	2:58:01 PM	1,765.5000	3	CEUX
Genmab A/S	19/06/2024	2:58:01 PM	1,765.5000	25	XCSE
Genmab A/S	19/06/2024	2:58:01 PM	1,765.5000	6	XCSE
Genmab A/S	19/06/2024	2:58:32 PM	1,766.0000	10	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	51	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	107	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	41	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	10	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	15	AQEU
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	40	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	55	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	118	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	55	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	35	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	20	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	50	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	5	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	25	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	30	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	55	XCSE

19

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	55	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	45	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	10	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	29	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	22	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	31	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	50	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	30	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	54	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	12	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	51	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	12	CEUX
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	55	XCSE
Genmab A/S	19/06/2024	2:59:54 PM	1,766.0000	14	XCSE
Genmab A/S	19/06/2024	3:02:23 PM	1,763.5000	6	XCSE
Genmab A/S	19/06/2024	3:05:04 PM	1,764.5000	25	XCSE
Genmab A/S	19/06/2024	3:05:04 PM	1,764.5000	20	XCSE
Genmab A/S	19/06/2024	3:05:04 PM	1,764.5000	23	CEUX
Genmab A/S	19/06/2024	3:05:04 PM	1,764.5000	18	CEUX
Genmab A/S	19/06/2024	3:07:22 PM	1,764.0000	11	XCSE
Genmab A/S	19/06/2024	3:07:22 PM	1,764.0000	11	XCSE
Genmab A/S	19/06/2024	3:07:22 PM	1,764.0000	10	CEUX
Genmab A/S	19/06/2024	3:07:22 PM	1,764.0000	10	CEUX
Genmab A/S	19/06/2024	3:07:28 PM	1,764.0000	1	CEUX
Genmab A/S	19/06/2024	3:07:28 PM	1,764.0000	11	XCSE
Genmab A/S	19/06/2024	3:07:28 PM	1,764.0000	110	XCSE
Genmab A/S	19/06/2024	3:08:53 PM	1,764.5000	34	CEUX
Genmab A/S	19/06/2024	3:09:37 PM	1,764.5000	2	CEUX
Genmab A/S	19/06/2024	3:09:37 PM	1,764.5000	3	CEUX
Genmab A/S	19/06/2024	3:09:39 PM	1,764.5000	10	CEUX
Genmab A/S	19/06/2024	3:09:39 PM	1,764.5000	10	CEUX
Genmab A/S	19/06/2024	3:09:58 PM	1,765.0000	11	CEUX
Genmab A/S	19/06/2024	3:09:58 PM	1,765.0000	1	XCSE
Genmab A/S	19/06/2024	3:11:00 PM	1,765.0000	4	CEUX
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	18	CEUX
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	18	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	2	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	18	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	16	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	4	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	14	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	4	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	4	XCSE
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	6	CEUX
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	12	CEUX
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	18	CEUX
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	2	CEUX
Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	18	CEUX

20

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:11:17 PM	1,765.0000	8	CEUX
Genmab A/S	19/06/2024	3:12:02 PM	1,765.0000	41	XCSE
Genmab A/S	19/06/2024	3:12:02 PM	1,765.0000	60	XCSE
Genmab A/S	19/06/2024	3:12:02 PM	1,765.0000	54	CEUX
Genmab A/S	19/06/2024	3:12:07 PM	1,765.0000	1	XCSE
Genmab A/S	19/06/2024	3:12:31 PM	1,765.0000	1	XCSE
Genmab A/S	19/06/2024	3:12:31 PM	1,765.0000	9	TQEX
Genmab A/S	19/06/2024	3:12:48 PM	1,765.0000	1	XCSE
Genmab A/S	19/06/2024	3:14:00 PM	1,765.0000	54	CEUX
Genmab A/S	19/06/2024	3:14:00 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:14:09 PM	1,765.0000	18	CEUX
Genmab A/S	19/06/2024	3:14:11 PM	1,765.0000	18	CEUX
Genmab A/S	19/06/2024	3:14:11 PM	1,765.0000	19	XCSE
Genmab A/S	19/06/2024	3:14:11 PM	1,765.0000	19	XCSE
Genmab A/S	19/06/2024	3:14:11 PM	1,765.0000	18	CEUX
Genmab A/S	19/06/2024	3:14:11 PM	1,765.0000	18	CEUX
Genmab A/S	19/06/2024	3:14:11 PM	1,765.0000	18	XCSE
Genmab A/S	19/06/2024	3:14:12 PM	1,765.0000	18	CEUX
Genmab A/S	19/06/2024	3:14:12 PM	1,765.0000	3	CEUX
Genmab A/S	19/06/2024	3:14:12 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:14:12 PM	1,765.0000	1	XCSE
Genmab A/S	19/06/2024	3:14:12 PM	1,765.0000	1	XCSE
Genmab A/S	19/06/2024	3:17:44 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	3:17:44 PM	1,765.0000	2	CEUX
Genmab A/S	19/06/2024	3:18:24 PM	1,765.0000	5	CEUX
Genmab A/S	19/06/2024	3:18:32 PM	1,765.5000	13	XCSE
Genmab A/S	19/06/2024	3:18:32 PM	1,765.5000	26	XCSE
Genmab A/S	19/06/2024	3:19:35 PM	1,765.5000	24	CEUX
Genmab A/S	19/06/2024	3:19:35 PM	1,765.5000	18	CEUX
Genmab A/S	19/06/2024	3:19:35 PM	1,765.5000	2	CEUX
Genmab A/S	19/06/2024	3:19:35 PM	1,765.5000	3	XCSE
Genmab A/S	19/06/2024	3:19:35 PM	1,765.5000	55	CEUX
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	10	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	11	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	55	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	7	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	49	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	21	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	26	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	16	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	36	CEUX
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	6	CEUX
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	2	AQEU
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	9	AQEU
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	13	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	4	XCSE
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	15	CEUX

21

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:37 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	15	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	30	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	17	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	7	XCSE
Genmab A/S	19/06/2024	3:19:45 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:46 PM	1,765.0000	10	CEUX
Genmab A/S	19/06/2024	3:19:46 PM	1,765.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:46 PM	1,765.0000	30	XCSE
Genmab A/S	19/06/2024	3:19:46 PM	1,765.0000	35	XCSE
Genmab A/S	19/06/2024	3:19:46 PM	1,765.0000	8	XCSE
Genmab A/S	19/06/2024	3:19:46 PM	1,764.5000	10	AQEU
Genmab A/S	19/06/2024	3:19:46 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	3:19:46 PM	1,764.5000	31	XCSE
Genmab A/S	19/06/2024	3:19:46 PM	1,764.5000	43	XCSE
Genmab A/S	19/06/2024	3:19:46 PM	1,764.5000	17	CEUX
Genmab A/S	19/06/2024	3:19:46 PM	1,764.5000	25	XCSE
Genmab A/S	19/06/2024	3:19:48 PM	1,764.0000	20	CEUX
Genmab A/S	19/06/2024	3:19:48 PM	1,764.0000	2	CEUX
Genmab A/S	19/06/2024	3:19:48 PM	1,764.0000	3	AQEU
Genmab A/S	19/06/2024	3:19:48 PM	1,764.0000	23	XCSE
Genmab A/S	19/06/2024	3:19:48 PM	1,764.0000	23	XCSE
Genmab A/S	19/06/2024	3:19:48 PM	1,764.0000	23	XCSE
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	39	CEUX
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	1	CEUX
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	122	CEUX
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	81	CEUX
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	50	CEUX
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	31	CEUX

22

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	16	AQEU
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	2	AQEU
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	12	AQEU
Genmab A/S	19/06/2024	3:22:03 PM	1,765.0000	12	TQEX
Genmab A/S	19/06/2024	3:22:49 PM	1,764.0000	25	XCSE
Genmab A/S	19/06/2024	3:22:49 PM	1,764.0000	23	CEUX
Genmab A/S	19/06/2024	3:22:49 PM	1,764.0000	23	CEUX
Genmab A/S	19/06/2024	3:22:49 PM	1,764.0000	4	AQEU
Genmab A/S	19/06/2024	3:23:38 PM	1,764.5000	12	XCSE
Genmab A/S	19/06/2024	3:23:38 PM	1,764.5000	11	CEUX
Genmab A/S	19/06/2024	3:24:41 PM	1,765.0000	9	TQEX
Genmab A/S	19/06/2024	3:24:53 PM	1,765.0000	9	TQEX
Genmab A/S	19/06/2024	3:24:53 PM	1,765.0000	10	TQEX
Genmab A/S	19/06/2024	3:25:08 PM	1,765.0000	9	TQEX
Genmab A/S	19/06/2024	3:25:08 PM	1,765.0000	8	XCSE
Genmab A/S	19/06/2024	3:25:08 PM	1,765.0000	25	XCSE
Genmab A/S	19/06/2024	3:25:08 PM	1,765.0000	28	XCSE
Genmab A/S	19/06/2024	3:25:20 PM	1,765.0000	10	CEUX
Genmab A/S	19/06/2024	3:25:20 PM	1,765.0000	5	CEUX
Genmab A/S	19/06/2024	3:25:20 PM	1,765.0000	9	TQEX
Genmab A/S	19/06/2024	3:25:20 PM	1,765.0000	12	XCSE
Genmab A/S	19/06/2024	3:25:34 PM	1,765.0000	25	CEUX
Genmab A/S	19/06/2024	3:25:34 PM	1,765.0000	5	CEUX
Genmab A/S	19/06/2024	3:25:34 PM	1,765.0000	8	TQEX
Genmab A/S	19/06/2024	3:25:48 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:25:48 PM	1,765.0000	21	CEUX
Genmab A/S	19/06/2024	3:26:04 PM	1,765.0000	15	CEUX
Genmab A/S	19/06/2024	3:26:04 PM	1,765.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:18 PM	1,765.0000	19	CEUX
Genmab A/S	19/06/2024	3:26:18 PM	1,765.0000	2	XCSE
Genmab A/S	19/06/2024	3:26:18 PM	1,765.0000	14	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	81	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	15	AQEU
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	15	AQEU
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	18	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	12	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	6	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	6	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	6	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	6	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	32	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	12	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	70	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	11	XCSE
Genmab A/S	19/06/2024	3:26:32 PM	1,764.5000	40	XCSE

23

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	38	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	36	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	38	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	76	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	37	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	77	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	17	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	7	AQEU
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	8	AQEU
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	7	AQEU
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	15	AQEU
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	15	AQEU
Genmab A/S	19/06/2024	3:26:33 PM	1,764.5000	12	AQEU
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	26	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	59	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	13	XCSE
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	CEUX
Genmab A/S	19/06/2024	3:26:33 PM	1,764.0000	12	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	6	CEUX
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	13	CEUX
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	19	CEUX
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	3	AQEU
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	6	AQEU
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	20	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	16	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	24	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	20	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	40	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	14	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	40	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	220	XCSE
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	42	CEUX
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	12	CEUX
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	6	AQEU
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	3	AQEU
Genmab A/S	19/06/2024	3:27:33 PM	1,761.0000	30	XCSE
Genmab A/S	19/06/2024	3:32:15 PM	1,757.0000	6	AQEU
Genmab A/S	19/06/2024	3:32:35 PM	1,757.0000	3	AQEU

24

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:35:42 PM	1,758.5000	22	XCSE
Genmab A/S	19/06/2024	3:35:42 PM	1,758.5000	24	XCSE
Genmab A/S	19/06/2024	3:35:42 PM	1,758.5000	152	XCSE
Genmab A/S	19/06/2024	3:35:42 PM	1,758.5000	5	XCSE
Genmab A/S	19/06/2024	3:35:42 PM	1,758.5000	17	XCSE
Genmab A/S	19/06/2024	3:35:42 PM	1,758.5000	24	XCSE
Genmab A/S	19/06/2024	3:36:28 PM	1,759.0000	14	XCSE
Genmab A/S	19/06/2024	3:36:28 PM	1,759.0000	6	XCSE
Genmab A/S	19/06/2024	3:36:28 PM	1,759.0000	3	AQEU
Genmab A/S	19/06/2024	3:36:28 PM	1,759.0000	20	XCSE
Genmab A/S	19/06/2024	3:36:28 PM	1,759.0000	20	XCSE
Genmab A/S	19/06/2024	3:36:30 PM	1,759.0000	16	XCSE
Genmab A/S	19/06/2024	3:36:46 PM	1,758.5000	19	AQEU
Genmab A/S	19/06/2024	3:36:46 PM	1,758.5000	81	XCSE
Genmab A/S	19/06/2024	3:36:46 PM	1,758.5000	50	XCSE
Genmab A/S	19/06/2024	3:36:46 PM	1,758.5000	17	XCSE
Genmab A/S	19/06/2024	3:36:46 PM	1,758.5000	50	XCSE
Genmab A/S	19/06/2024	3:36:46 PM	1,758.5000	141	XCSE
Genmab A/S	19/06/2024	3:37:02 PM	1,758.5000	85	CEUX
Genmab A/S	19/06/2024	3:38:51 PM	1,758.5000	14	XCSE
Genmab A/S	19/06/2024	3:39:41 PM	1,759.0000	24	CEUX
Genmab A/S	19/06/2024	3:39:41 PM	1,759.0000	7	CEUX
Genmab A/S	19/06/2024	3:39:47 PM	1,759.0000	34	XCSE
Genmab A/S	19/06/2024	3:39:59 PM	1,759.0000	21	CEUX
Genmab A/S	19/06/2024	3:39:59 PM	1,759.0000	15	CEUX
Genmab A/S	19/06/2024	3:40:00 PM	1,758.5000	129	XCSE
Genmab A/S	19/06/2024	3:40:40 PM	1,759.5000	33	CEUX
Genmab A/S	19/06/2024	3:40:45 PM	1,759.0000	3	AQEU
Genmab A/S	19/06/2024	3:40:45 PM	1,759.0000	44	AQEU
Genmab A/S	19/06/2024	3:40:45 PM	1,759.0000	15	XCSE
Genmab A/S	19/06/2024	3:40:45 PM	1,759.0000	5	XCSE
Genmab A/S	19/06/2024	3:41:09 PM	1,759.0000	40	XCSE
Genmab A/S	19/06/2024	3:41:22 PM	1,759.5000	12	CEUX
Genmab A/S	19/06/2024	3:41:22 PM	1,759.5000	3	CEUX
Genmab A/S	19/06/2024	3:41:25 PM	1,759.0000	38	XCSE
Genmab A/S	19/06/2024	3:41:25 PM	1,759.0000	308	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	38	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	38	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	26	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	12	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	16	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	6	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	16	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	6	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	38	XCSE
Genmab A/S	19/06/2024	3:41:40 PM	1,759.0000	38	XCSE
Genmab A/S	19/06/2024	3:41:41 PM	1,759.0000	27	XCSE
Genmab A/S	19/06/2024	3:41:41 PM	1,759.0000	11	XCSE
Genmab A/S	19/06/2024	3:41:57 PM	1,758.0000	43	XCSE

25

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:41:57 PM	1,758.0000	6	AQEU
Genmab A/S	19/06/2024	3:41:57 PM	1,758.0000	6	AQEU
Genmab A/S	19/06/2024	3:41:57 PM	1,758.0000	6	AQEU
Genmab A/S	19/06/2024	3:41:57 PM	1,758.0000	39	XCSE
Genmab A/S	19/06/2024	3:41:57 PM	1,758.0000	6	AQEU
Genmab A/S	19/06/2024	3:41:57 PM	1,758.0000	4	XCSE
Genmab A/S	19/06/2024	3:42:19 PM	1,758.0000	22	AQEU
Genmab A/S	19/06/2024	3:42:19 PM	1,758.0000	1	AQEU
Genmab A/S	19/06/2024	3:42:19 PM	1,758.0000	1	AQEU
Genmab A/S	19/06/2024	3:42:19 PM	1,758.0000	21	AQEU
Genmab A/S	19/06/2024	3:42:46 PM	1,758.0000	42	XCSE
Genmab A/S	19/06/2024	3:42:46 PM	1,758.0000	14	AQEU
Genmab A/S	19/06/2024	3:42:46 PM	1,758.0000	2	AQEU
Genmab A/S	19/06/2024	3:42:46 PM	1,758.0000	67	XCSE
Genmab A/S	19/06/2024	3:42:46 PM	1,758.0000	6	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	18	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	13	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	33	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	33	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	13	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	33	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	13	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	6	AQEU
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	13	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	33	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	5	XCSE
Genmab A/S	19/06/2024	3:42:57 PM	1,757.5000	2	AQEU
Genmab A/S	19/06/2024	3:42:58 PM	1,757.5000	11	XCSE
Genmab A/S	19/06/2024	3:46:14 PM	1,761.0000	23	CEUX
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	14	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	5	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	3	AQEU

26

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	3	AQEU
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	2	AQEU
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	17	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	3	AQEU
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	3	AQEU
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	3:46:17 PM	1,760.5000	2	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	25	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	16	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	5	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	134	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	16	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	9	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	116	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	17	AQEU
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	18	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	84	XCSE
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	17	AQEU
Genmab A/S	19/06/2024	3:47:51 PM	1,759.5000	18	XCSE
Genmab A/S	19/06/2024	3:47:52 PM	1,759.5000	14	AQEU
Genmab A/S	19/06/2024	3:47:52 PM	1,759.5000	14	XCSE
Genmab A/S	19/06/2024	3:49:30 PM	1,761.0000	23	XCSE
Genmab A/S	19/06/2024	3:49:54 PM	1,760.5000	150	XCSE
Genmab A/S	19/06/2024	3:49:54 PM	1,760.5000	132	XCSE
Genmab A/S	19/06/2024	3:50:24 PM	1,761.0000	11	CEUX
Genmab A/S	19/06/2024	3:50:24 PM	1,761.0000	12	CEUX
Genmab A/S	19/06/2024	3:50:25 PM	1,761.0000	16	CEUX
Genmab A/S	19/06/2024	3:50:26 PM	1,761.0000	5	CEUX
Genmab A/S	19/06/2024	3:50:26 PM	1,761.0000	2	CEUX
Genmab A/S	19/06/2024	3:50:27 PM	1,761.0000	13	CEUX
Genmab A/S	19/06/2024	3:50:27 PM	1,761.0000	10	CEUX
Genmab A/S	19/06/2024	3:50:27 PM	1,761.0000	23	CEUX
Genmab A/S	19/06/2024	3:50:28 PM	1,761.0000	23	CEUX
Genmab A/S	19/06/2024	3:50:28 PM	1,761.0000	6	CEUX
Genmab A/S	19/06/2024	3:51:05 PM	1,760.5000	78	XCSE
Genmab A/S	19/06/2024	3:51:05 PM	1,760.5000	183	XCSE
Genmab A/S	19/06/2024	3:53:23 PM	1,761.5000	21	XCSE
Genmab A/S	19/06/2024	3:53:23 PM	1,761.5000	21	XCSE
Genmab A/S	19/06/2024	3:53:23 PM	1,761.5000	21	XCSE
Genmab A/S	19/06/2024	3:53:23 PM	1,761.5000	21	XCSE
Genmab A/S	19/06/2024	3:53:23 PM	1,761.5000	20	XCSE
Genmab A/S	19/06/2024	3:54:18 PM	1,762.5000	19	XCSE
Genmab A/S	19/06/2024	3:54:18 PM	1,762.5000	15	XCSE
Genmab A/S	19/06/2024	3:54:18 PM	1,762.5000	1	XCSE

27

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	68	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	50	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	16	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	9	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	16	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	14	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	11	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	73	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	44	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	11	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	14	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:38 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	3:54:39 PM	1,762.5000	8	XCSE
Genmab A/S	19/06/2024	3:54:39 PM	1,762.5000	17	XCSE
Genmab A/S	19/06/2024	3:54:39 PM	1,762.5000	16	XCSE
Genmab A/S	19/06/2024	3:54:39 PM	1,762.5000	9	XCSE
Genmab A/S	19/06/2024	3:55:29 PM	1,761.5000	22	XCSE
Genmab A/S	19/06/2024	3:55:50 PM	1,761.5000	18	XCSE
Genmab A/S	19/06/2024	3:55:50 PM	1,761.5000	18	XCSE
Genmab A/S	19/06/2024	3:55:50 PM	1,761.5000	13	XCSE
Genmab A/S	19/06/2024	3:57:41 PM	1,762.0000	1	TQEX
Genmab A/S	19/06/2024	3:57:41 PM	1,762.0000	9	TQEX
Genmab A/S	19/06/2024	3:57:41 PM	1,762.0000	22	XCSE
Genmab A/S	19/06/2024	3:57:41 PM	1,762.0000	7	XCSE
Genmab A/S	19/06/2024	3:57:47 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	3:57:47 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	3:57:47 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	3:57:50 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	3:57:59 PM	1,761.0000	6	AQEU
Genmab A/S	19/06/2024	3:57:59 PM	1,761.0000	14	AQEU
Genmab A/S	19/06/2024	3:57:59 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	3:57:59 PM	1,761.0000	109	XCSE
Genmab A/S	19/06/2024	3:57:59 PM	1,761.0000	1	XCSE
Genmab A/S	19/06/2024	3:57:59 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	3:58:00 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	10	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	33	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	231	XCSE

28

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	115	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	29	AQEU
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	27	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	12	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	38	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	50	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	27	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	23	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	4	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	10	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	50	XCSE
Genmab A/S	19/06/2024	3:58:58 PM	1,760.5000	42	XCSE
Genmab A/S	19/06/2024	4:01:14 PM	1,763.0000	20	XCSE
Genmab A/S	19/06/2024	4:01:14 PM	1,763.0000	7	XCSE
Genmab A/S	19/06/2024	4:01:14 PM	1,763.0000	19	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	8	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	17	XCSE
Genmab A/S	19/06/2024	4:01:15 PM	1,763.0000	9	XCSE
Genmab A/S	19/06/2024	4:02:27 PM	1,763.5000	23	XCSE
Genmab A/S	19/06/2024	4:02:27 PM	1,763.5000	103	XCSE
Genmab A/S	19/06/2024	4:02:27 PM	1,763.5000	23	XCSE
Genmab A/S	19/06/2024	4:02:27 PM	1,763.5000	23	XCSE
Genmab A/S	19/06/2024	4:04:12 PM	1,764.0000	18	XCSE
Genmab A/S	19/06/2024	4:04:12 PM	1,764.0000	26	XCSE
Genmab A/S	19/06/2024	4:04:23 PM	1,763.5000	3	XCSE
Genmab A/S	19/06/2024	4:04:27 PM	1,763.5000	42	XCSE
Genmab A/S	19/06/2024	4:04:27 PM	1,763.5000	42	XCSE
Genmab A/S	19/06/2024	4:04:27 PM	1,763.5000	3	XCSE
Genmab A/S	19/06/2024	4:04:27 PM	1,763.5000	45	XCSE
Genmab A/S	19/06/2024	4:04:30 PM	1,763.5000	32	XCSE
Genmab A/S	19/06/2024	4:04:30 PM	1,763.5000	13	XCSE
Genmab A/S	19/06/2024	4:04:30 PM	1,763.5000	20	XCSE
Genmab A/S	19/06/2024	4:04:31 PM	1,763.5000	19	XCSE
Genmab A/S	19/06/2024	4:04:33 PM	1,763.0000	39	XCSE
Genmab A/S	19/06/2024	4:04:33 PM	1,763.0000	16	XCSE
Genmab A/S	19/06/2024	4:04:33 PM	1,763.0000	29	XCSE
Genmab A/S	19/06/2024	4:04:34 PM	1,763.0000	39	XCSE
Genmab A/S	19/06/2024	4:04:34 PM	1,763.0000	13	XCSE
Genmab A/S	19/06/2024	4:04:35 PM	1,763.0000	21	XCSE

29

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:04:35 PM	1,763.0000	17	XCSE
Genmab A/S	19/06/2024	4:05:52 PM	1,763.5000	66	XCSE
Genmab A/S	19/06/2024	4:05:52 PM	1,763.5000	241	XCSE
Genmab A/S	19/06/2024	4:05:52 PM	1,763.5000	66	XCSE
Genmab A/S	19/06/2024	4:05:52 PM	1,763.5000	59	XCSE
Genmab A/S	19/06/2024	4:05:52 PM	1,763.5000	7	XCSE
Genmab A/S	19/06/2024	4:05:54 PM	1,763.5000	66	XCSE
Genmab A/S	19/06/2024	4:05:54 PM	1,763.5000	38	XCSE
Genmab A/S	19/06/2024	4:05:54 PM	1,763.5000	14	XCSE
Genmab A/S	19/06/2024	4:05:54 PM	1,763.5000	14	XCSE
Genmab A/S	19/06/2024	4:05:54 PM	1,763.5000	14	XCSE
Genmab A/S	19/06/2024	4:05:54 PM	1,763.5000	42	XCSE
Genmab A/S	19/06/2024	4:08:14 PM	1,763.0000	120	XCSE
Genmab A/S	19/06/2024	4:08:14 PM	1,763.0000	34	XCSE
Genmab A/S	19/06/2024	4:08:14 PM	1,763.0000	34	XCSE
Genmab A/S	19/06/2024	4:08:14 PM	1,763.0000	79	XCSE
Genmab A/S	19/06/2024	4:08:14 PM	1,763.0000	14	XCSE
Genmab A/S	19/06/2024	4:08:16 PM	1,763.0000	2	XCSE
Genmab A/S	19/06/2024	4:08:45 PM	1,762.5000	6	AQEU
Genmab A/S	19/06/2024	4:08:45 PM	1,762.5000	19	XCSE
Genmab A/S	19/06/2024	4:08:45 PM	1,762.5000	107	XCSE
Genmab A/S	19/06/2024	4:08:45 PM	1,762.5000	72	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	124	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	55	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	38	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	6	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	44	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	34	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	16	AQEU
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	3	XCSE
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	16	AQEU
Genmab A/S	19/06/2024	4:10:26 PM	1,762.5000	2	AQEU
Genmab A/S	19/06/2024	4:10:27 PM	1,762.5000	11	XCSE
Genmab A/S	19/06/2024	4:10:31 PM	1,762.0000	23	XCSE
Genmab A/S	19/06/2024	4:10:31 PM	1,762.0000	23	XCSE
Genmab A/S	19/06/2024	4:11:41 PM	1,763.0000	21	XCSE
Genmab A/S	19/06/2024	4:12:11 PM	1,763.0000	27	XCSE
Genmab A/S	19/06/2024	4:12:11 PM	1,763.0000	45	XCSE
Genmab A/S	19/06/2024	4:12:11 PM	1,763.0000	16	XCSE
Genmab A/S	19/06/2024	4:12:11 PM	1,763.0000	11	XCSE
Genmab A/S	19/06/2024	4:12:11 PM	1,763.0000	16	XCSE
Genmab A/S	19/06/2024	4:12:14 PM	1,763.0000	7	XCSE
Genmab A/S	19/06/2024	4:14:27 PM	1,764.0000	22	XCSE
Genmab A/S	19/06/2024	4:14:27 PM	1,764.0000	26	XCSE
Genmab A/S	19/06/2024	4:14:27 PM	1,764.0000	1	XCSE
Genmab A/S	19/06/2024	4:14:27 PM	1,764.0000	22	XCSE
Genmab A/S	19/06/2024	4:14:27 PM	1,764.0000	27	XCSE
Genmab A/S	19/06/2024	4:14:27 PM	1,764.0000	17	XCSE

30

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:16:00 PM	1,764.5000	40	XCSE
Genmab A/S	19/06/2024	4:16:00 PM	1,764.5000	27	XCSE
Genmab A/S	19/06/2024	4:16:00 PM	1,764.5000	13	XCSE
Genmab A/S	19/06/2024	4:16:02 PM	1,764.5000	15	XCSE
Genmab A/S	19/06/2024	4:16:02 PM	1,764.5000	13	XCSE
Genmab A/S	19/06/2024	4:16:02 PM	1,764.5000	12	XCSE
Genmab A/S	19/06/2024	4:16:02 PM	1,764.5000	22	XCSE
Genmab A/S	19/06/2024	4:16:02 PM	1,764.5000	13	XCSE
Genmab A/S	19/06/2024	4:16:02 PM	1,764.5000	4	XCSE
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	1	XCSE
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	1	XCSE
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	5	AQEU
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	12	AQEU
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	33	XCSE
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	30	XCSE
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	28	XCSE
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	3	AQEU
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	5	AQEU
Genmab A/S	19/06/2024	4:16:03 PM	1,764.5000	5	AQEU
Genmab A/S	19/06/2024	4:16:04 PM	1,764.5000	8	XCSE
Genmab A/S	19/06/2024	4:16:06 PM	1,764.0000	112	XCSE
Genmab A/S	19/06/2024	4:16:06 PM	1,764.0000	58	XCSE
Genmab A/S	19/06/2024	4:16:07 PM	1,764.0000	117	XCSE
Genmab A/S	19/06/2024	4:17:07 PM	1,763.5000	3	XCSE
Genmab A/S	19/06/2024	4:17:37 PM	1,764.0000	1	TQEX
Genmab A/S	19/06/2024	4:17:43 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:17:43 PM	1,764.5000	10	AQEU
Genmab A/S	19/06/2024	4:17:43 PM	1,764.5000	16	AQEU
Genmab A/S	19/06/2024	4:17:46 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:17:46 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:17:50 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:17:50 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:17:56 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:17:56 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:01 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:01 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:06 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:06 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:06 PM	1,764.5000	25	AQEU
Genmab A/S	19/06/2024	4:18:06 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:12 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:12 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:15 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:15 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:19 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:19 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:24 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:24 PM	1,764.5000	2	AQEU

31

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:18:28 PM	1,764.5000	1	AQEU
Genmab A/S	19/06/2024	4:18:28 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:28 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:34 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:34 PM	1,764.5000	9	AQEU
Genmab A/S	19/06/2024	4:18:34 PM	1,764.5000	25	AQEU
Genmab A/S	19/06/2024	4:18:37 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:40 PM	1,764.5000	2	AQEU
Genmab A/S	19/06/2024	4:18:44 PM	1,764.0000	17	XCSE
Genmab A/S	19/06/2024	4:18:44 PM	1,764.0000	37	XCSE
Genmab A/S	19/06/2024	4:18:44 PM	1,764.0000	5	XCSE
Genmab A/S	19/06/2024	4:18:44 PM	1,764.0000	9	XCSE
Genmab A/S	19/06/2024	4:19:00 PM	1,764.5000	10	TQEX
Genmab A/S	19/06/2024	4:19:00 PM	1,764.5000	9	XCSE
Genmab A/S	19/06/2024	4:19:00 PM	1,764.5000	10	XCSE
Genmab A/S	19/06/2024	4:19:00 PM	1,764.5000	5	XCSE
Genmab A/S	19/06/2024	4:19:00 PM	1,764.5000	3	XCSE
Genmab A/S	19/06/2024	4:19:05 PM	1,765.0000	1	AQEU
Genmab A/S	19/06/2024	4:19:05 PM	1,765.0000	2	AQEU
Genmab A/S	19/06/2024	4:19:05 PM	1,765.0000	36	AQEU
Genmab A/S	19/06/2024	4:19:21 PM	1,766.5000	27	XCSE
Genmab A/S	19/06/2024	4:19:21 PM	1,766.5000	27	XCSE
Genmab A/S	19/06/2024	4:19:24 PM	1,766.5000	27	XCSE
Genmab A/S	19/06/2024	4:19:24 PM	1,766.5000	27	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	68	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	28	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	4	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	25	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	6	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	41	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	32	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	37	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	2	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	30	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	46	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	9	XCSE
Genmab A/S	19/06/2024	4:20:23 PM	1,767.0000	14	XCSE
Genmab A/S	19/06/2024	4:20:34 PM	1,766.5000	91	XCSE
Genmab A/S	19/06/2024	4:20:34 PM	1,766.5000	90	XCSE
Genmab A/S	19/06/2024	4:20:34 PM	1,766.5000	31	XCSE
Genmab A/S	19/06/2024	4:22:09 PM	1,766.0000	1	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	144	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	15	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	130	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	20	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	61	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	64	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	25	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	120	XCSE

32

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	10	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	25	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	74	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	14	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	22	XCSE
Genmab A/S	19/06/2024	4:22:13 PM	1,766.0000	10	XCSE
Genmab A/S	19/06/2024	4:22:14 PM	1,765.5000	7	AQEU
Genmab A/S	19/06/2024	4:22:14 PM	1,765.5000	44	XCSE
Genmab A/S	19/06/2024	4:24:42 PM	1,765.0000	30	XCSE
Genmab A/S	19/06/2024	4:24:42 PM	1,765.0000	50	XCSE
Genmab A/S	19/06/2024	4:24:42 PM	1,765.0000	39	XCSE
Genmab A/S	19/06/2024	4:24:42 PM	1,765.0000	38	XCSE
Genmab A/S	19/06/2024	4:24:42 PM	1,765.0000	50	XCSE
Genmab A/S	19/06/2024	4:24:42 PM	1,765.0000	30	XCSE
Genmab A/S	19/06/2024	4:25:15 PM	1,765.0000	23	XCSE
Genmab A/S	19/06/2024	4:25:15 PM	1,765.0000	14	XCSE
Genmab A/S	19/06/2024	4:25:16 PM	1,765.0000	9	XCSE
Genmab A/S	19/06/2024	4:25:16 PM	1,765.0000	6	XCSE
Genmab A/S	19/06/2024	4:25:22 PM	1,764.5000	16	XCSE
Genmab A/S	19/06/2024	4:25:22 PM	1,764.5000	6	XCSE
Genmab A/S	19/06/2024	4:25:22 PM	1,764.5000	15	XCSE
Genmab A/S	19/06/2024	4:25:23 PM	1,764.5000	7	XCSE
Genmab A/S	19/06/2024	4:25:23 PM	1,764.5000	15	XCSE
Genmab A/S	19/06/2024	4:26:00 PM	1,764.0000	183	XCSE
Genmab A/S	19/06/2024	4:27:02 PM	1,764.0000	8	XCSE
Genmab A/S	19/06/2024	4:27:02 PM	1,764.0000	34	XCSE
Genmab A/S	19/06/2024	4:27:02 PM	1,764.0000	183	XCSE
Genmab A/S	19/06/2024	4:27:03 PM	1,764.0000	44	XCSE
Genmab A/S	19/06/2024	4:27:03 PM	1,764.0000	88	XCSE
Genmab A/S	19/06/2024	4:27:03 PM	1,764.0000	51	XCSE
Genmab A/S	19/06/2024	4:27:03 PM	1,764.0000	28	XCSE
Genmab A/S	19/06/2024	4:27:03 PM	1,764.0000	41	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.5000	362	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.5000	149	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	3	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	46	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	49	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	35	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	38	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	12	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	37	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	49	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	1	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	34	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	15	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	34	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	39	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	38	XCSE
Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	49	XCSE

33

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:28:30 PM	1,763.0000	26	XCSE
Genmab A/S	19/06/2024	4:28:31 PM	1,762.5000	49	XCSE
Genmab A/S	19/06/2024	4:28:31 PM	1,762.5000	12	XCSE
Genmab A/S	19/06/2024	4:28:31 PM	1,762.5000	21	XCSE
Genmab A/S	19/06/2024	4:32:25 PM	1,761.0000	53	XCSE
Genmab A/S	19/06/2024	4:34:50 PM	1,762.0000	1	XCSE
Genmab A/S	19/06/2024	4:35:01 PM	1,762.0000	25	XCSE
Genmab A/S	19/06/2024	4:35:01 PM	1,762.0000	15	XCSE
Genmab A/S	19/06/2024	4:35:01 PM	1,762.0000	7	XCSE
Genmab A/S	19/06/2024	4:35:01 PM	1,762.0000	13	XCSE
Genmab A/S	19/06/2024	4:35:02 PM	1,762.0000	13	XCSE
Genmab A/S	19/06/2024	4:35:02 PM	1,762.0000	22	XCSE
Genmab A/S	19/06/2024	4:35:03 PM	1,762.0000	26	XCSE
Genmab A/S	19/06/2024	4:35:03 PM	1,762.0000	15	XCSE
Genmab A/S	19/06/2024	4:35:04 PM	1,762.0000	7	XCSE
Genmab A/S	19/06/2024	4:35:04 PM	1,762.0000	26	XCSE
Genmab A/S	19/06/2024	4:36:15 PM	1,762.5000	10	AQEU
Genmab A/S	19/06/2024	4:36:15 PM	1,762.5000	9	AQEU
Genmab A/S	19/06/2024	4:36:15 PM	1,762.5000	16	AQEU
Genmab A/S	19/06/2024	4:36:15 PM	1,762.5000	1	AQEU
Genmab A/S	19/06/2024	4:36:22 PM	1,762.5000	2	AQEU
Genmab A/S	19/06/2024	4:36:26 PM	1,762.5000	2	AQEU
Genmab A/S	19/06/2024	4:36:26 PM	1,762.5000	9	AQEU
Genmab A/S	19/06/2024	4:36:31 PM	1,762.5000	2	AQEU
Genmab A/S	19/06/2024	4:36:34 PM	1,762.5000	2	AQEU
Genmab A/S	19/06/2024	4:36:34 PM	1,762.5000	9	AQEU
Genmab A/S	19/06/2024	4:36:35 PM	1,762.0000	25	XCSE
Genmab A/S	19/06/2024	4:36:36 PM	1,762.0000	14	XCSE
Genmab A/S	19/06/2024	4:36:37 PM	1,762.0000	7	XCSE
Genmab A/S	19/06/2024	4:36:38 PM	1,762.0000	13	XCSE
Genmab A/S	19/06/2024	4:36:42 PM	1,762.0000	35	XCSE
Genmab A/S	19/06/2024	4:37:13 PM	1,762.0000	39	XCSE
Genmab A/S	19/06/2024	4:37:18 PM	1,762.5000	42	XCSE
Genmab A/S	19/06/2024	4:37:23 PM	1,762.5000	1	XCSE
Genmab A/S	19/06/2024	4:38:23 PM	1,762.5000	160	XCSE
Genmab A/S	19/06/2024	4:38:23 PM	1,762.5000	7	XCSE
Genmab A/S	19/06/2024	4:38:23 PM	1,762.5000	43	XCSE
Genmab A/S	19/06/2024	4:38:23 PM	1,762.5000	191	XCSE
Genmab A/S	19/06/2024	4:38:23 PM	1,762.5000	113	XCSE
Genmab A/S	19/06/2024	4:38:23 PM	1,762.5000	113	XCSE
Genmab A/S	19/06/2024	4:38:24 PM	1,762.5000	53	XCSE
Genmab A/S	19/06/2024	4:38:24 PM	1,762.5000	1	XCSE
Genmab A/S	19/06/2024	4:38:24 PM	1,762.5000	19	XCSE
Genmab A/S	19/06/2024	4:38:24 PM	1,762.5000	20	XCSE
Genmab A/S	19/06/2024	4:38:24 PM	1,762.5000	18	XCSE
Genmab A/S	19/06/2024	4:38:25 PM	1,762.5000	82	XCSE
Genmab A/S	19/06/2024	4:38:25 PM	1,762.5000	67	XCSE
Genmab A/S	19/06/2024	4:38:25 PM	1,762.5000	78	XCSE
Genmab A/S	19/06/2024	4:38:25 PM	1,762.5000	4	XCSE

34

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:38:25 PM	1,762.5000	9	XCSE
Genmab A/S	19/06/2024	4:38:25 PM	1,762.5000	9	XCSE
Genmab A/S	19/06/2024	4:38:26 PM	1,762.5000	35	XCSE
Genmab A/S	19/06/2024	4:38:26 PM	1,762.5000	25	XCSE
Genmab A/S	19/06/2024	4:38:26 PM	1,762.5000	7	XCSE
Genmab A/S	19/06/2024	4:38:26 PM	1,762.5000	167	XCSE
Genmab A/S	19/06/2024	4:40:01 PM	1,761.0000	200	XCSE
Genmab A/S	19/06/2024	4:40:01 PM	1,761.0000	530	XCSE
Genmab A/S	19/06/2024	4:43:20 PM	1,759.0000	166	XCSE
Genmab A/S	19/06/2024	4:43:20 PM	1,759.0000	65	XCSE
Genmab A/S	19/06/2024	4:43:20 PM	1,759.0000	45	XCSE
Genmab A/S	19/06/2024	4:43:22 PM	1,759.0000	276	XCSE
Genmab A/S	19/06/2024	4:43:22 PM	1,759.0000	19	XCSE
Genmab A/S	19/06/2024	4:43:50 PM	1,759.5000	25	XCSE
Genmab A/S	19/06/2024	4:45:57 PM	1,761.0000	4	TQEX
Genmab A/S	19/06/2024	4:45:57 PM	1,761.0000	22	XCSE
Genmab A/S	19/06/2024	4:45:57 PM	1,761.0000	5	XCSE
Genmab A/S	19/06/2024	4:45:57 PM	1,761.0000	5	XCSE
Genmab A/S	19/06/2024	4:46:02 PM	1,761.0000	17	XCSE
Genmab A/S	19/06/2024	4:46:02 PM	1,761.0000	20	XCSE
Genmab A/S	19/06/2024	4:46:06 PM	1,761.0000	1	TQEX
Genmab A/S	19/06/2024	4:46:06 PM	1,761.0000	22	XCSE
Genmab A/S	19/06/2024	4:46:06 PM	1,761.0000	9	XCSE
Genmab A/S	19/06/2024	4:46:07 PM	1,761.0000	8	XCSE
Genmab A/S	19/06/2024	4:46:33 PM	1,760.5000	65	XCSE
Genmab A/S	19/06/2024	4:46:33 PM	1,760.5000	73	XCSE
Genmab A/S	19/06/2024	4:46:33 PM	1,760.5000	25	XCSE
Genmab A/S	19/06/2024	4:46:33 PM	1,760.5000	15	XCSE
Genmab A/S	19/06/2024	4:46:34 PM	1,760.5000	76	XCSE
Genmab A/S	19/06/2024	4:46:35 PM	1,760.5000	44	XCSE
Genmab A/S	19/06/2024	4:46:35 PM	1,760.5000	3	XCSE
Genmab A/S	19/06/2024	4:46:35 PM	1,760.5000	16	XCSE
Genmab A/S	19/06/2024	4:47:32 PM	1,761.0000	2	TQEX
Genmab A/S	19/06/2024	4:47:32 PM	1,761.0000	9	TQEX
Genmab A/S	19/06/2024	4:47:32 PM	1,761.0000	8	TQEX
Genmab A/S	19/06/2024	4:47:32 PM	1,761.0000	9	TQEX
Genmab A/S	19/06/2024	4:47:32 PM	1,761.0000	9	XCSE
Genmab A/S	19/06/2024	4:47:35 PM	1,761.0000	25	XCSE
Genmab A/S	19/06/2024	4:47:35 PM	1,761.0000	14	XCSE
Genmab A/S	19/06/2024	4:47:41 PM	1,760.5000	35	XCSE
Genmab A/S	19/06/2024	4:48:16 PM	1,760.0000	151	XCSE
Genmab A/S	19/06/2024	4:48:16 PM	1,760.0000	98	XCSE
Genmab A/S	19/06/2024	4:48:16 PM	1,760.0000	66	XCSE
Genmab A/S	19/06/2024	4:48:26 PM	1,760.0000	32	XCSE
Genmab A/S	19/06/2024	4:48:26 PM	1,760.0000	26	XCSE
Genmab A/S	19/06/2024	4:48:26 PM	1,760.0000	10	XCSE
Genmab A/S	19/06/2024	4:48:39 PM	1,760.0000	15	XCSE
Genmab A/S	19/06/2024	4:48:41 PM	1,760.0000	5	XCSE
Genmab A/S	19/06/2024	4:48:56 PM	1,760.5000	9	AQEU

35

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:48:56 PM	1,760.5000	2	AQEU
Genmab A/S	19/06/2024	4:48:56 PM	1,760.5000	8	AQEU
Genmab A/S	19/06/2024	4:48:56 PM	1,760.5000	40	AQEU
Genmab A/S	19/06/2024	4:48:56 PM	1,760.5000	16	AQEU
Genmab A/S	19/06/2024	4:49:00 PM	1,760.5000	2	TQEX
Genmab A/S	19/06/2024	4:49:00 PM	1,760.5000	9	TQEX
Genmab A/S	19/06/2024	4:49:05 PM	1,760.5000	1	TQEX
Genmab A/S	19/06/2024	4:49:05 PM	1,760.5000	9	TQEX
Genmab A/S	19/06/2024	4:49:09 PM	1,760.5000	19	XCSE
Genmab A/S	19/06/2024	4:49:09 PM	1,760.5000	22	XCSE
Genmab A/S	19/06/2024	4:49:45 PM	1,761.0000	23	XCSE
Genmab A/S	19/06/2024	4:49:45 PM	1,761.0000	3	XCSE
Genmab A/S	19/06/2024	4:49:47 PM	1,761.0000	14	XCSE
Genmab A/S	19/06/2024	4:49:47 PM	1,761.0000	9	XCSE
Genmab A/S	19/06/2024	4:49:47 PM	1,761.0000	18	XCSE
Genmab A/S	19/06/2024	4:49:47 PM	1,761.0000	5	XCSE
Genmab A/S	19/06/2024	4:49:47 PM	1,761.0000	23	XCSE
Genmab A/S	19/06/2024	4:50:21 PM	1,761.0000	13	XCSE
Genmab A/S	19/06/2024	4:50:25 PM	1,761.0000	91	XCSE
Genmab A/S	19/06/2024	4:50:25 PM	1,761.0000	50	XCSE
Genmab A/S	19/06/2024	4:50:29 PM	1,761.0000	89	XCSE
Genmab A/S	19/06/2024	4:50:29 PM	1,761.0000	25	XCSE
Genmab A/S	19/06/2024	4:50:29 PM	1,761.0000	19	XCSE
Genmab A/S	19/06/2024	4:50:30 PM	1,761.0000	6	XCSE
Genmab A/S	19/06/2024	4:50:36 PM	1,761.0000	1	XCSE
Genmab A/S	19/06/2024	4:50:41 PM	1,761.0000	12	XCSE
Genmab A/S	19/06/2024	4:50:49 PM	1,761.0000	50	XCSE
Genmab A/S	19/06/2024	4:50:49 PM	1,761.0000	20	XCSE
Genmab A/S	19/06/2024	4:50:49 PM	1,761.0000	18	XCSE
Genmab A/S	19/06/2024	4:51:00 PM	1,761.0000	2	XCSE
Genmab A/S	19/06/2024	4:51:00 PM	1,761.0000	9	XCSE
Genmab A/S	19/06/2024	4:51:05 PM	1,761.0000	1	XCSE
Genmab A/S	19/06/2024	4:51:05 PM	1,761.0000	35	XCSE
Genmab A/S	19/06/2024	4:51:07 PM	1,761.0000	7	XCSE
Genmab A/S	19/06/2024	4:51:07 PM	1,761.0000	8	XCSE
Genmab A/S	19/06/2024	4:51:07 PM	1,761.0000	1	XCSE
Genmab A/S	19/06/2024	4:51:18 PM	1,761.0000	26	XCSE
Genmab A/S	19/06/2024	4:51:18 PM	1,761.0000	20	XCSE
Genmab A/S	19/06/2024	4:51:18 PM	1,761.0000	4	XCSE
Genmab A/S	19/06/2024	4:51:25 PM	1,761.0000	3	XCSE
Genmab A/S	19/06/2024	4:51:41 PM	1,761.0000	26	XCSE
Genmab A/S	19/06/2024	4:52:21 PM	1,761.0000	9	XCSE
Genmab A/S	19/06/2024	4:52:27 PM	1,761.0000	7	XCSE
Genmab A/S	19/06/2024	4:52:40 PM	1,761.0000	25	XCSE
Genmab A/S	19/06/2024	4:52:46 PM	1,761.0000	17	AQEU
Genmab A/S	19/06/2024	4:52:46 PM	1,761.0000	21	AQEU
Genmab A/S	19/06/2024	4:52:49 PM	1,761.0000	14	XCSE
Genmab A/S	19/06/2024	4:52:49 PM	1,761.0000	22	XCSE
Genmab A/S	19/06/2024	4:52:50 PM	1,761.0000	8	XCSE

36

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:52:54 PM	1,761.0000	33	XCSE
Genmab A/S	19/06/2024	4:52:57 PM	1,761.0000	9	XCSE
Genmab A/S	19/06/2024	4:53:04 PM	1,761.0000	32	XCSE
Genmab A/S	19/06/2024	4:53:04 PM	1,761.0000	17	XCSE
Genmab A/S	19/06/2024	4:53:04 PM	1,761.0000	1	XCSE
Genmab A/S	19/06/2024	4:53:11 PM	1,761.0000	22	XCSE
Genmab A/S	19/06/2024	4:53:13 PM	1,761.0000	30	XCSE
Genmab A/S	19/06/2024	4:53:13 PM	1,761.0000	18	XCSE
Genmab A/S	19/06/2024	4:53:17 PM	1,761.0000	24	XCSE
Genmab A/S	19/06/2024	4:53:28 PM	1,761.0000	33	XCSE
Genmab A/S	19/06/2024	4:53:38 PM	1,761.0000	150	XCSE
Genmab A/S	19/06/2024	4:53:38 PM	1,761.0000	23	XCSE
Genmab A/S	19/06/2024	4:53:39 PM	1,761.0000	15	XCSE
Genmab A/S	19/06/2024	4:53:43 PM	1,761.0000	26	XCSE
Genmab A/S	19/06/2024	4:53:43 PM	1,761.0000	13	XCSE
Genmab A/S	19/06/2024	4:53:43 PM	1,761.0000	25	XCSE
Genmab A/S	19/06/2024	4:53:43 PM	1,761.0000	16	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.0000	31	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.0000	7	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.5000	40	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.5000	11	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.5000	14	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.5000	10	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.5000	30	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.5000	39	XCSE
Genmab A/S	19/06/2024	4:53:49 PM	1,761.5000	25	XCSE
Genmab A/S	19/06/2024	4:53:50 PM	1,761.5000	30	XCSE
Genmab A/S	19/06/2024	4:53:50 PM	1,761.5000	30	XCSE
Genmab A/S	19/06/2024	4:53:50 PM	1,761.5000	11	XCSE
Genmab A/S	19/06/2024	4:53:51 PM	1,761.5000	13	XCSE
Genmab A/S	19/06/2024	4:53:52 PM	1,761.5000	41	XCSE
Genmab A/S	19/06/2024	4:53:52 PM	1,761.5000	12	XCSE
Genmab A/S	19/06/2024	4:53:52 PM	1,761.5000	15	XCSE
Genmab A/S	19/06/2024	4:54:00 PM	1,761.5000	41	XCSE
Genmab A/S	19/06/2024	4:54:00 PM	1,761.5000	25	XCSE
Genmab A/S	19/06/2024	4:54:05 PM	1,761.5000	12	XCSE
Genmab A/S	19/06/2024	4:54:05 PM	1,761.5000	25	XCSE
Genmab A/S	19/06/2024	4:54:05 PM	1,761.5000	13	XCSE
Genmab A/S	19/06/2024	4:54:05 PM	1,761.5000	12	XCSE
Genmab A/S	19/06/2024	4:54:05 PM	1,761.5000	11	XCSE
Genmab A/S	19/06/2024	4:54:05 PM	1,761.5000	12	XCSE
Genmab A/S	19/06/2024	4:54:07 PM	1,761.5000	14	XCSE
Genmab A/S	19/06/2024	4:54:28 PM	1,761.5000	12	XCSE
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	8	AQEU
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	6	AQEU
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	20	AQEU
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	9	AQEU
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	16	AQEU
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	2	AQEU

37

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	19/06/2024	4:54:29 PM	1,761.0000	42	XCSE
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	2	TQEX
Genmab A/S	19/06/2024	4:54:29 PM	1,761.5000	1	TQEX
Genmab A/S	19/06/2024	4:54:38 PM	1,761.0000	17	XCSE
Genmab A/S	19/06/2024	4:54:50 PM	1,761.0000	27	XCSE
Genmab A/S	19/06/2024	4:54:55 PM	1,761.0000	3	XCSE
Genmab A/S	20/06/2024	9:02:10 AM	1,754.5000	14	CEUX
Genmab A/S	20/06/2024	9:02:10 AM	1,754.5000	11	AQEU
Genmab A/S	20/06/2024	9:02:10 AM	1,754.5000	10	TQEX
Genmab A/S	20/06/2024	9:02:10 AM	1,754.5000	1	XCSE
Genmab A/S	20/06/2024	9:02:19 AM	1,755.0000	27	XCSE
Genmab A/S	20/06/2024	9:02:26 AM	1,757.5000	39	XCSE
Genmab A/S	20/06/2024	9:02:30 AM	1,757.5000	33	XCSE
Genmab A/S	20/06/2024	9:03:00 AM	1,759.5000	44	XCSE
Genmab A/S	20/06/2024	9:03:00 AM	1,759.5000	4	XCSE
Genmab A/S	20/06/2024	9:03:00 AM	1,759.5000	30	XCSE
Genmab A/S	20/06/2024	9:03:00 AM	1,759.5000	10	XCSE
Genmab A/S	20/06/2024	9:03:00 AM	1,759.5000	44	XCSE
Genmab A/S	20/06/2024	9:03:00 AM	1,759.5000	8	XCSE
Genmab A/S	20/06/2024	9:03:05 AM	1,760.0000	37	XCSE
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	45	CEUX
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	2	CEUX
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	39	XCSE
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	10	XCSE
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	10	XCSE
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	39	XCSE
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	21	XCSE
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	43	CEUX
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	5	CEUX
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	14	CEUX
Genmab A/S	20/06/2024	9:03:05 AM	1,759.0000	14	CEUX
Genmab A/S	20/06/2024	9:03:09 AM	1,759.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:11 AM	1,759.5000	49	XCSE
Genmab A/S	20/06/2024	9:03:11 AM	1,759.5000	44	CEUX
Genmab A/S	20/06/2024	9:03:11 AM	1,759.5000	8	CEUX
Genmab A/S	20/06/2024	9:03:11 AM	1,759.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:11 AM	1,759.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:11 AM	1,759.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	43	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	10	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	35	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	35	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	8	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	35	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	39	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	41	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	38	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	1	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	4	CEUX

38

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	37	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	37	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	21	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	10	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	39	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	6	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	5	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	5	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	26	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	5	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	3	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,760.5000	9	XCSE
Genmab A/S	20/06/2024	9:03:51 AM	1,759.0000	21	CEUX
Genmab A/S	20/06/2024	9:03:51 AM	1,759.0000	3	AQEU
Genmab A/S	20/06/2024	9:03:51 AM	1,759.0000	5	TQEX
Genmab A/S	20/06/2024	9:03:51 AM	1,759.0000	23	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	24	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	24	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	24	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	24	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	24	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	24	XCSE

39

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	28	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	24	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	19	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	5	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	19	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	5	XCSE
Genmab A/S	20/06/2024	9:06:03 AM	1,759.5000	10	XCSE
Genmab A/S	20/06/2024	9:06:36 AM	1,758.5000	37	XCSE
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	10	CEUX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	10	CEUX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	10	CEUX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	10	CEUX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	8	CEUX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	1	AQEU
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	10	XCSE
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	59	XCSE
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	5	TQEX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	10	CEUX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	5	TQEX
Genmab A/S	20/06/2024	9:06:51 AM	1,759.5000	9	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	84	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	84	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	73	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	11	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	19	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	11	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	4	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	50	XCSE
Genmab A/S	20/06/2024	9:08:01 AM	1,763.5000	30	XCSE
Genmab A/S	20/06/2024	9:08:02 AM	1,763.0000	198	XCSE
Genmab A/S	20/06/2024	9:08:02 AM	1,763.0000	173	XCSE
Genmab A/S	20/06/2024	9:08:02 AM	1,762.5000	23	CEUX
Genmab A/S	20/06/2024	9:08:02 AM	1,762.5000	27	XCSE
Genmab A/S	20/06/2024	9:08:03 AM	1,762.5000	27	XCSE
Genmab A/S	20/06/2024	9:08:03 AM	1,762.5000	27	XCSE
Genmab A/S	20/06/2024	9:08:03 AM	1,762.5000	3	CEUX
Genmab A/S	20/06/2024	9:08:03 AM	1,762.5000	26	CEUX
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	23	XCSE
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	58	XCSE
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	21	CEUX
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	21	CEUX
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	21	CEUX
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	9	CEUX
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	3	AQEU
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	5	TQEX
Genmab A/S	20/06/2024	9:09:07 AM	1,762.0000	5	TQEX
Genmab A/S	20/06/2024	9:09:09 AM	1,762.0000	52	XCSE
Genmab A/S	20/06/2024	9:10:07 AM	1,763.0000	21	XCSE
Genmab A/S	20/06/2024	9:10:07 AM	1,763.0000	27	XCSE

40

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:10:07 AM	1,763.0000	18	XCSE
Genmab A/S	20/06/2024	9:10:08 AM	1,763.0000	49	XCSE
Genmab A/S	20/06/2024	9:10:57 AM	1,762.0000	2	AQEU
Genmab A/S	20/06/2024	9:12:47 AM	1,764.5000	9	CEUX
Genmab A/S	20/06/2024	9:12:47 AM	1,764.5000	9	AQEU
Genmab A/S	20/06/2024	9:12:47 AM	1,764.5000	9	TQEX
Genmab A/S	20/06/2024	9:12:47 AM	1,764.5000	13	XCSE
Genmab A/S	20/06/2024	9:13:01 AM	1,765.0000	12	XCSE
Genmab A/S	20/06/2024	9:13:09 AM	1,765.0000	35	XCSE
Genmab A/S	20/06/2024	9:13:09 AM	1,765.0000	24	XCSE
Genmab A/S	20/06/2024	9:13:09 AM	1,765.0000	528	XCSE
Genmab A/S	20/06/2024	9:14:24 AM	1,763.5000	35	XCSE
Genmab A/S	20/06/2024	9:15:23 AM	1,764.0000	46	XCSE
Genmab A/S	20/06/2024	9:15:23 AM	1,764.0000	43	CEUX
Genmab A/S	20/06/2024	9:15:23 AM	1,764.0000	5	CEUX
Genmab A/S	20/06/2024	9:15:40 AM	1,764.5000	34	CEUX
Genmab A/S	20/06/2024	9:15:54 AM	1,764.5000	50	XCSE
Genmab A/S	20/06/2024	9:15:54 AM	1,764.5000	96	XCSE
Genmab A/S	20/06/2024	9:15:54 AM	1,764.5000	50	CEUX
Genmab A/S	20/06/2024	9:15:54 AM	1,764.5000	48	CEUX
Genmab A/S	20/06/2024	9:15:54 AM	1,764.5000	19	AQEU
Genmab A/S	20/06/2024	9:15:54 AM	1,764.5000	20	TQEX
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	7	XCSE
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	36	XCSE
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	44	XCSE
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	12	XCSE
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	29	XCSE
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	20	XCSE
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	23	XCSE
Genmab A/S	20/06/2024	9:16:13 AM	1,763.5000	6	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	38	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	5	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	36	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	43	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	44	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	35	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	41	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	11	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	7	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	23	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	21	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	20	XCSE
Genmab A/S	20/06/2024	9:16:14 AM	1,763.5000	1	XCSE
Genmab A/S	20/06/2024	9:19:08 AM	1,764.0000	91	XCSE
Genmab A/S	20/06/2024	9:19:54 AM	1,763.0000	1	CEUX
Genmab A/S	20/06/2024	9:20:47 AM	1,763.0000	40	CEUX
Genmab A/S	20/06/2024	9:20:47 AM	1,763.0000	5	XCSE
Genmab A/S	20/06/2024	9:21:33 AM	1,763.0000	29	CEUX
Genmab A/S	20/06/2024	9:21:38 AM	1,763.0000	4	CEUX

41

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:21:40 AM	1,763.0000	14	CEUX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	19	CEUX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	25	CEUX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	25	CEUX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	19	CEUX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	25	CEUX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	6	CEUX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	3	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	1	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	3	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	AQEU
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	26	XCSE
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	33	XCSE
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	56	XCSE
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	26	XCSE
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	4	TQEX
Genmab A/S	20/06/2024	9:21:45 AM	1,763.0000	19	XCSE
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	9	XCSE
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	9	XCSE
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	3	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	10	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	3	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	4	CEUX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	1	AQEU
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	3	AQEU
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	11	TQEX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	5	TQEX

42

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	11	TQEX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	5	TQEX
Genmab A/S	20/06/2024	9:23:37 AM	1,763.0000	1	AQEU
Genmab A/S	20/06/2024	9:24:17 AM	1,762.5000	46	XCSE
Genmab A/S	20/06/2024	9:24:17 AM	1,762.5000	36	XCSE
Genmab A/S	20/06/2024	9:24:17 AM	1,762.5000	54	XCSE
Genmab A/S	20/06/2024	9:24:48 AM	1,762.5000	16	XCSE
Genmab A/S	20/06/2024	9:24:48 AM	1,762.5000	30	XCSE
Genmab A/S	20/06/2024	9:24:48 AM	1,762.5000	90	CEUX
Genmab A/S	20/06/2024	9:24:48 AM	1,762.5000	14	XCSE
Genmab A/S	20/06/2024	9:27:09 AM	1,764.5000	10	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	2	XCSE
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	11	XCSE
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	39	XCSE
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	13	XCSE
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	9	XCSE
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	11	XCSE
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	2	XCSE
Genmab A/S	20/06/2024	9:27:27 AM	1,765.0000	11	XCSE
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	13	XCSE
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	20	XCSE
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	5	CEUX
Genmab A/S	20/06/2024	9:28:12 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	7	XCSE
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	6	XCSE
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	13	XCSE
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	12	CEUX
Genmab A/S	20/06/2024	9:28:13 AM	1,765.0000	11	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	46	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	46	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	46	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	1	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	9	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	33	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	2	CEUX

43

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	18	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	22	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	42	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	19	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	42	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	2	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	3	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	2	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	6	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	6	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	6	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	5	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	1	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	5	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	6	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	1	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	5	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	4	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	4	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	3	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	11	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	7	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	1	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	7	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	7	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	7	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	45	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.5000	30	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	21	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	4	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	6	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	11	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	20	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	20	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	3	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	2	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	2	AQEU
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	4	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	5	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	5	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	2	TQEX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	17	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	7	CEUX
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	7	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	4	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	4	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	5	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	1	XCSE
Genmab A/S	20/06/2024	9:30:02 AM	1,764.0000	17	XCSE

44

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:30:03 AM	1,764.0000	48	CEUX
Genmab A/S	20/06/2024	9:30:03 AM	1,764.0000	19	CEUX
Genmab A/S	20/06/2024	9:30:03 AM	1,764.0000	11	CEUX
Genmab A/S	20/06/2024	9:30:07 AM	1,763.5000	18	CEUX
Genmab A/S	20/06/2024	9:30:07 AM	1,763.5000	5	TQEX
Genmab A/S	20/06/2024	9:30:07 AM	1,763.5000	17	XCSE
Genmab A/S	20/06/2024	9:30:07 AM	1,763.5000	4	XCSE
Genmab A/S	20/06/2024	9:32:44 AM	1,763.0000	14	XCSE
Genmab A/S	20/06/2024	9:32:44 AM	1,763.0000	9	XCSE
Genmab A/S	20/06/2024	9:32:44 AM	1,763.0000	21	CEUX
Genmab A/S	20/06/2024	9:32:44 AM	1,763.0000	6	TQEX
Genmab A/S	20/06/2024	9:33:50 AM	1,762.5000	57	CEUX
Genmab A/S	20/06/2024	9:33:50 AM	1,762.5000	57	CEUX
Genmab A/S	20/06/2024	9:33:50 AM	1,762.5000	2	CEUX
Genmab A/S	20/06/2024	9:33:50 AM	1,762.5000	9	TQEX
Genmab A/S	20/06/2024	9:33:50 AM	1,762.5000	9	TQEX
Genmab A/S	20/06/2024	9:33:50 AM	1,762.5000	63	XCSE
Genmab A/S	20/06/2024	9:33:50 AM	1,762.5000	50	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	20	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	4	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	46	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	10	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	24	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	83	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	24	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	36	XCSE
Genmab A/S	20/06/2024	9:35:15 AM	1,766.0000	24	XCSE
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	41	CEUX
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	9	CEUX
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	55	XCSE
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	26	XCSE
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	9	XCSE
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	27	XCSE
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	21	CEUX
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	29	CEUX
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	50	CEUX
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	50	CEUX
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	27	CEUX
Genmab A/S	20/06/2024	9:37:04 AM	1,766.0000	19	XCSE
Genmab A/S	20/06/2024	9:38:44 AM	1,767.0000	12	XCSE
Genmab A/S	20/06/2024	9:38:44 AM	1,767.0000	12	XCSE
Genmab A/S	20/06/2024	9:38:44 AM	1,767.0000	12	CEUX
Genmab A/S	20/06/2024	9:38:46 AM	1,766.5000	18	XCSE
Genmab A/S	20/06/2024	9:39:17 AM	1,766.5000	18	XCSE
Genmab A/S	20/06/2024	9:39:17 AM	1,766.5000	2	XCSE
Genmab A/S	20/06/2024	9:39:19 AM	1,766.5000	18	XCSE
Genmab A/S	20/06/2024	9:39:53 AM	1,767.5000	8	CEUX
Genmab A/S	20/06/2024	9:39:53 AM	1,767.5000	27	XCSE
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	8	XCSE

45

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	11	XCSE
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	9	CEUX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	9	CEUX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	9	CEUX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	9	CEUX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	9	CEUX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	6	CEUX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	1	AQEU
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	7	TQEX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	7	TQEX
Genmab A/S	20/06/2024	9:40:28 AM	1,767.0000	7	TQEX
Genmab A/S	20/06/2024	9:41:16 AM	1,769.0000	45	CEUX
Genmab A/S	20/06/2024	9:41:16 AM	1,769.0000	10	CEUX
Genmab A/S	20/06/2024	9:41:16 AM	1,768.5000	8	XCSE
Genmab A/S	20/06/2024	9:41:16 AM	1,769.0000	21	CEUX
Genmab A/S	20/06/2024	9:41:16 AM	1,768.5000	9	CEUX
Genmab A/S	20/06/2024	9:41:16 AM	1,768.5000	7	TQEX
Genmab A/S	20/06/2024	9:41:30 AM	1,769.0000	9	AQEU
Genmab A/S	20/06/2024	9:41:35 AM	1,769.0000	9	AQEU
Genmab A/S	20/06/2024	9:41:35 AM	1,769.0000	1	AQEU
Genmab A/S	20/06/2024	9:41:35 AM	1,769.0000	9	TQEX
Genmab A/S	20/06/2024	9:41:35 AM	1,769.0000	1	TQEX
Genmab A/S	20/06/2024	9:41:35 AM	1,769.0000	18	XCSE
Genmab A/S	20/06/2024	9:41:53 AM	1,769.0000	33	XCSE
Genmab A/S	20/06/2024	9:42:00 AM	1,769.0000	3	AQEU
Genmab A/S	20/06/2024	9:42:00 AM	1,769.0000	30	AQEU
Genmab A/S	20/06/2024	9:42:07 AM	1,769.0000	23	CEUX
Genmab A/S	20/06/2024	9:42:30 AM	1,769.5000	25	XCSE
Genmab A/S	20/06/2024	9:42:30 AM	1,769.5000	6	XCSE
Genmab A/S	20/06/2024	9:42:35 AM	1,769.0000	56	XCSE
Genmab A/S	20/06/2024	9:42:35 AM	1,769.0000	152	XCSE
Genmab A/S	20/06/2024	9:42:35 AM	1,769.0000	51	CEUX
Genmab A/S	20/06/2024	9:42:35 AM	1,769.0000	16	CEUX
Genmab A/S	20/06/2024	9:42:35 AM	1,769.0000	7	TQEX
Genmab A/S	20/06/2024	9:42:35 AM	1,769.0000	41	TQEX
Genmab A/S	20/06/2024	9:42:35 AM	1,769.5000	37	TQEX
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	56	XCSE
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	75	XCSE
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	51	CEUX
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	51	CEUX
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	37	CEUX
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	7	TQEX
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	5	TQEX
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	4	XCSE
Genmab A/S	20/06/2024	9:42:40 AM	1,769.0000	52	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	56	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	8	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	8	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	50	XCSE

46

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	58	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	50	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	2	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	8	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	8	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	4	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	4	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	4	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	4	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	8	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	5	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	11	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	17	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	11	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	12	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.5000	2	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	10	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	13	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	4	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	4	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	6	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	17	XCSE
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	5	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	11	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	17	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	11	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	2	CEUX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	1	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	2	AQEU
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	5	TQEX
Genmab A/S	20/06/2024	9:44:39 AM	1,768.0000	5	TQEX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	10	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	52	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	52	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	10	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	28	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	28	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	50	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	50	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	6	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	22	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	28	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	6	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	22	CEUX

47

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	10	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	56	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	41	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	21	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	11	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	17	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	15	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	9	TQEX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	8	TQEX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	51	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	51	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	11	XCSE
Genmab A/S	20/06/2024	9:47:27 AM	1,768.5000	68	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.0000	6	CEUX
Genmab A/S	20/06/2024	9:47:27 AM	1,768.0000	11	CEUX
Genmab A/S	20/06/2024	9:51:48 AM	1,768.0000	36	CEUX
Genmab A/S	20/06/2024	9:53:38 AM	1,768.0000	75	CEUX
Genmab A/S	20/06/2024	9:53:44 AM	1,768.0000	50	CEUX
Genmab A/S	20/06/2024	9:53:44 AM	1,768.0000	80	CEUX
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	114	XCSE
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	4	XCSE
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	104	XCSE
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	26	CEUX
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	95	CEUX
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	15	AQEU
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	5	AQEU
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	13	AQEU
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	14	AQEU
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	11	TQEX
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	14	TQEX
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	6	TQEX
Genmab A/S	20/06/2024	9:53:47 AM	1,768.0000	19	TQEX
Genmab A/S	20/06/2024	9:53:48 AM	1,768.0000	36	XCSE
Genmab A/S	20/06/2024	9:53:48 AM	1,768.0000	14	XCSE
Genmab A/S	20/06/2024	9:53:48 AM	1,768.0000	50	XCSE
Genmab A/S	20/06/2024	9:53:48 AM	1,768.0000	42	XCSE
Genmab A/S	20/06/2024	9:53:57 AM	1,767.0000	21	XCSE
Genmab A/S	20/06/2024	9:53:57 AM	1,767.0000	40	XCSE
Genmab A/S	20/06/2024	9:53:57 AM	1,767.0000	2	CEUX
Genmab A/S	20/06/2024	9:53:57 AM	1,767.0000	2	AQEU
Genmab A/S	20/06/2024	9:53:57 AM	1,767.0000	5	TQEX
Genmab A/S	20/06/2024	9:54:20 AM	1,768.0000	21	XCSE
Genmab A/S	20/06/2024	9:54:20 AM	1,768.0000	6	XCSE
Genmab A/S	20/06/2024	9:56:41 AM	1,773.5000	19	XCSE
Genmab A/S	20/06/2024	9:56:51 AM	1,773.0000	18	XCSE

48

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	6	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	2	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	1	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	7	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	1	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	30	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	56	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE

49

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	8	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	19	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	30	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	30	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	18	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	18	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	59	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	9	XCSE
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	17	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	17	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	1	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	17	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	2	AQEU
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	1	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	9	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,774.0000	10	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	17	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	6	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	2	AQEU
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	17	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	3	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	2	AQEU
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	2	AQEU
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	7	AQEU
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	4	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	1	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	8	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	1	AQEU
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	42	CEUX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	1	TQEX
Genmab A/S	20/06/2024	9:58:25 AM	1,773.0000	5	XCSE
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	5	TQEX
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	17	CEUX
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	15	CEUX
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	2	AQEU
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	2	AQEU
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	18	XCSE
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	5	XCSE
Genmab A/S	20/06/2024	9:58:40 AM	1,770.0000	18	XCSE
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	21	CEUX
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	5	TQEX
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	7	CEUX
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	14	CEUX
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	9	CEUX

50

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	3	AQEU
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	8	AQEU
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	5	TQEX
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	5	TQEX
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	22	XCSE
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	22	XCSE
Genmab A/S	20/06/2024	10:02:11 AM	1,773.0000	22	XCSE
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	40	CEUX
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	20	CEUX
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	21	CEUX
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	6	TQEX
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	5	TQEX
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	5	TQEX
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	44	XCSE
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	22	XCSE
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	22	XCSE
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	34	XCSE
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	20	CEUX
Genmab A/S	20/06/2024	10:02:13 AM	1,775.5000	10	CEUX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	11	CEUX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	19	CEUX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	1	CEUX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	19	CEUX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	5	TQEX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	5	TQEX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	6	TQEX
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	17	XCSE
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	22	XCSE
Genmab A/S	20/06/2024	10:02:14 AM	1,775.5000	22	XCSE
Genmab A/S	20/06/2024	10:08:26 AM	1,782.0000	2	XCSE
Genmab A/S	20/06/2024	10:08:27 AM	1,782.0000	4	XCSE
Genmab A/S	20/06/2024	10:08:27 AM	1,782.0000	31	XCSE
Genmab A/S	20/06/2024	10:08:27 AM	1,781.5000	102	XCSE
Genmab A/S	20/06/2024	10:08:27 AM	1,781.5000	8	XCSE
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	110	XCSE
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	110	XCSE
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	32	XCSE
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	19	XCSE
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	9	AQEU
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	5	AQEU
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	14	AQEU
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	14	AQEU
Genmab A/S	20/06/2024	10:08:30 AM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	10:09:02 AM	1,780.5000	19	XCSE
Genmab A/S	20/06/2024	10:09:02 AM	1,780.5000	5	TQEX
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	3	XCSE
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	7	XCSE
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	10	XCSE
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	4	XCSE

51

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	10	CEUX
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	10	CEUX
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	10	CEUX
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	5	TQEX
Genmab A/S	20/06/2024	10:10:24 AM	1,781.5000	10	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	10	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	10	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	10	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	10	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	3	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	10	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	3	CEUX
Genmab A/S	20/06/2024	10:12:06 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:12:07 AM	1,783.5000	9	XCSE
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	41	XCSE
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	37	CEUX
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	5	TQEX
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	41	XCSE
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	37	CEUX
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	41	XCSE
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	41	XCSE
Genmab A/S	20/06/2024	10:12:16 AM	1,785.0000	15	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	7	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	5	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	4	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	7	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	11	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	7	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	8	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	8	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	8	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	8	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	CEUX

52

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	8	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	3	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	8	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	1	CEUX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	9	XCSE
Genmab A/S	20/06/2024	10:14:19 AM	1,783.5000	7	XCSE
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	8	XCSE
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	44	XCSE
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	9	CEUX
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	5	TQEX
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	9	CEUX
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	1	AQEU
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	5	TQEX
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	33	TQEX
Genmab A/S	20/06/2024	10:14:59 AM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	10:15:18 AM	1,784.5000	32	XCSE
Genmab A/S	20/06/2024	10:15:18 AM	1,784.5000	32	XCSE
Genmab A/S	20/06/2024	10:15:22 AM	1,784.0000	19	XCSE
Genmab A/S	20/06/2024	10:15:22 AM	1,784.0000	50	XCSE
Genmab A/S	20/06/2024	10:16:20 AM	1,783.0000	7	AQEU
Genmab A/S	20/06/2024	10:16:20 AM	1,783.0000	38	CEUX
Genmab A/S	20/06/2024	10:16:20 AM	1,783.0000	10	CEUX
Genmab A/S	20/06/2024	10:16:20 AM	1,783.0000	19	CEUX
Genmab A/S	20/06/2024	10:16:20 AM	1,783.0000	7	TQEX
Genmab A/S	20/06/2024	10:16:20 AM	1,783.0000	38	XCSE
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	21	XCSE
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	21	XCSE
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	21	CEUX
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	9	CEUX
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	8	CEUX
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	4	CEUX
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	21	CEUX
Genmab A/S	20/06/2024	10:17:49 AM	1,784.0000	4	CEUX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	21	CEUX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	21	CEUX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	3	CEUX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	21	CEUX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	3	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	3	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	3	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	3	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	3	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	9	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	9	AQEU

53

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	9	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	22	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	22	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	22	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.5000	6	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	21	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	21	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	21	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	21	XCSE
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	12	CEUX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	2	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	2	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	2	AQEU
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	5	TQEX
Genmab A/S	20/06/2024	10:18:37 AM	1,783.0000	5	TQEX
Genmab A/S	20/06/2024	10:20:25 AM	1,784.0000	5	TQEX
Genmab A/S	20/06/2024	10:20:25 AM	1,784.0000	9	CEUX
Genmab A/S	20/06/2024	10:20:25 AM	1,784.0000	9	CEUX
Genmab A/S	20/06/2024	10:20:25 AM	1,784.0000	9	CEUX
Genmab A/S	20/06/2024	10:20:25 AM	1,784.0000	3	CEUX
Genmab A/S	20/06/2024	10:20:25 AM	1,784.0000	1	AQEU
Genmab A/S	20/06/2024	10:21:40 AM	1,784.5000	60	XCSE
Genmab A/S	20/06/2024	10:21:40 AM	1,784.5000	73	XCSE
Genmab A/S	20/06/2024	10:21:41 AM	1,784.5000	8	AQEU
Genmab A/S	20/06/2024	10:21:41 AM	1,784.5000	10	TQEX
Genmab A/S	20/06/2024	10:21:41 AM	1,784.5000	71	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	16	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	64	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	13	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	16	CEUX
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	16	CEUX
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	16	CEUX
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	5	TQEX
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	5	TQEX
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	3	TQEX
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	39	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	6	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	27	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	6	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	10	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	5	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	6	XCSE
Genmab A/S	20/06/2024	10:22:27 AM	1,788.0000	16	XCSE
Genmab A/S	20/06/2024	10:25:13 AM	1,786.5000	11	TQEX
Genmab A/S	20/06/2024	10:25:40 AM	1,787.0000	2	TQEX
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	7	XCSE
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	29	XCSE
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	20	TQEX
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	4	CEUX

54

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	5	AQEU
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	2	CEUX
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	19	XCSE
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	29	XCSE
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	31	CEUX
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	6	TQEX
Genmab A/S	20/06/2024	10:25:45 AM	1,787.0000	6	XCSE
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	30	XCSE
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	12	XCSE
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	31	XCSE
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	6	CEUX
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	30	XCSE
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	27	XCSE
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	46	XCSE
Genmab A/S	20/06/2024	10:25:47 AM	1,787.0000	49	XCSE
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	20	CEUX
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	20	CEUX
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	3	AQEU
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	22	XCSE
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	22	XCSE
Genmab A/S	20/06/2024	10:26:06 AM	1,785.5000	17	CEUX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	18	XCSE
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	21	XCSE
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	5	XCSE
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	2	AQEU
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	2	AQEU
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	5	TQEX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	5	TQEX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	17	CEUX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	20	CEUX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	2	AQEU
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	2	AQEU
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	2	AQEU
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	2	AQEU
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	5	TQEX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	5	TQEX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	3	CEUX
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	13	XCSE
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	21	XCSE
Genmab A/S	20/06/2024	10:27:12 AM	1,786.0000	5	XCSE
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	17	CEUX
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	2	CEUX
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	19	CEUX
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	5	TQEX
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	20	XCSE
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	20	XCSE
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	20	XCSE

55

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	20	XCSE
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	19	CEUX
Genmab A/S	20/06/2024	10:29:03 AM	1,787.0000	7	CEUX
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	33	CEUX
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	8	AQEU
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	8	AQEU
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	8	AQEU
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	8	TQEX
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	8	AQEU
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	18	TQEX
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	8	TQEX
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	60	XCSE
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	34	XCSE
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	26	XCSE
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	34	XCSE
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	26	XCSE
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	34	XCSE
Genmab A/S	20/06/2024	10:30:38 AM	1,788.0000	26	XCSE
Genmab A/S	20/06/2024	10:30:39 AM	1,788.0000	3	CEUX
Genmab A/S	20/06/2024	10:30:39 AM	1,788.0000	8	AQEU
Genmab A/S	20/06/2024	10:30:39 AM	1,788.0000	4	AQEU
Genmab A/S	20/06/2024	10:30:39 AM	1,788.0000	8	TQEX
Genmab A/S	20/06/2024	10:30:39 AM	1,788.0000	4	TQEX
Genmab A/S	20/06/2024	10:30:39 AM	1,788.0000	19	CEUX
Genmab A/S	20/06/2024	10:30:39 AM	1,788.0000	15	CEUX
Genmab A/S	20/06/2024	10:30:41 AM	1,788.0000	131	XCSE
Genmab A/S	20/06/2024	10:30:41 AM	1,788.0000	50	XCSE
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	6	CEUX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	1	CEUX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	15	CEUX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	5	CEUX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	16	CEUX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	20	CEUX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	1	CEUX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	5	TQEX
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	10:31:25 AM	1,787.0000	6	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	51	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	45	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	10	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	5	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	9	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	1	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	6	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	1	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	7	AQEU

56

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	7	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	7	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	7	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	9	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	35	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	7	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	19	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	3	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	40	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	51	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	27	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	33	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	18	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	9	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	51	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	3	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	23	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	31	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	3	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	21	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,785.0000	42	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	22	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	22	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	22	CEUX
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	4	AQEU
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	22	XCSE
Genmab A/S	20/06/2024	10:35:40 AM	1,784.5000	26	CEUX
Genmab A/S	20/06/2024	10:36:11 AM	1,778.0000	45	XCSE
Genmab A/S	20/06/2024	10:36:11 AM	1,778.0000	14	XCSE
Genmab A/S	20/06/2024	10:38:02 AM	1,776.0000	67	XCSE
Genmab A/S	20/06/2024	10:38:02 AM	1,776.0000	41	XCSE
Genmab A/S	20/06/2024	10:38:02 AM	1,776.0000	99	XCSE
Genmab A/S	20/06/2024	10:38:02 AM	1,776.0000	14	XCSE
Genmab A/S	20/06/2024	10:38:03 AM	1,776.0000	12	XCSE
Genmab A/S	20/06/2024	10:39:24 AM	1,775.0000	43	XCSE
Genmab A/S	20/06/2024	10:39:24 AM	1,775.0000	24	XCSE
Genmab A/S	20/06/2024	10:39:24 AM	1,775.0000	43	XCSE
Genmab A/S	20/06/2024	10:39:24 AM	1,775.0000	4	XCSE
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	19	XCSE
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	19	CEUX
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	3	CEUX
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	6	CEUX
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	2	AQEU

57

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	9	AQEU
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	5	TQEX
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	3	TQEX
Genmab A/S	20/06/2024	10:41:04 AM	1,772.5000	12	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,776.0000	38	CEUX
Genmab A/S	20/06/2024	10:44:59 AM	1,776.0000	44	CEUX
Genmab A/S	20/06/2024	10:44:59 AM	1,776.0000	12	AQEU
Genmab A/S	20/06/2024	10:44:59 AM	1,776.0000	12	TQEX
Genmab A/S	20/06/2024	10:44:59 AM	1,776.0000	58	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,776.0000	33	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,775.0000	22	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,775.0000	1	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,775.0000	22	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,775.0000	5	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,775.0000	50	XCSE
Genmab A/S	20/06/2024	10:44:59 AM	1,775.0000	50	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	81	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	22	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	22	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	22	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	8	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	14	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	14	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	6	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	73	CEUX
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	11	AQEU
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	11	TQEX
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	16	XCSE
Genmab A/S	20/06/2024	10:48:38 AM	1,779.0000	48	XCSE
Genmab A/S	20/06/2024	10:50:03 AM	1,778.0000	9	CEUX
Genmab A/S	20/06/2024	10:50:03 AM	1,778.0000	31	CEUX
Genmab A/S	20/06/2024	10:50:03 AM	1,778.0000	29	CEUX
Genmab A/S	20/06/2024	10:50:03 AM	1,778.0000	10	AQEU
Genmab A/S	20/06/2024	10:50:03 AM	1,778.0000	11	TQEX
Genmab A/S	20/06/2024	10:50:03 AM	1,778.0000	77	XCSE
Genmab A/S	20/06/2024	10:50:03 AM	1,777.5000	23	TQEX
Genmab A/S	20/06/2024	10:50:03 AM	1,777.5000	18	TQEX
Genmab A/S	20/06/2024	10:51:39 AM	1,776.5000	74	XCSE
Genmab A/S	20/06/2024	10:51:39 AM	1,776.5000	10	XCSE
Genmab A/S	20/06/2024	10:51:39 AM	1,776.5000	76	CEUX
Genmab A/S	20/06/2024	10:51:39 AM	1,776.5000	12	TQEX
Genmab A/S	20/06/2024	10:51:39 AM	1,776.5000	11	AQEU
Genmab A/S	20/06/2024	10:54:02 AM	1,777.0000	13	CEUX
Genmab A/S	20/06/2024	10:54:02 AM	1,777.0000	55	CEUX
Genmab A/S	20/06/2024	10:54:02 AM	1,777.0000	10	TQEX
Genmab A/S	20/06/2024	10:54:02 AM	1,777.0000	75	XCSE
Genmab A/S	20/06/2024	10:54:56 AM	1,777.0000	73	XCSE
Genmab A/S	20/06/2024	10:54:56 AM	1,777.0000	63	CEUX
Genmab A/S	20/06/2024	10:54:56 AM	1,777.0000	2	CEUX

58

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	10:54:56 AM	1,777.0000	10	AQEU
Genmab A/S	20/06/2024	10:54:56 AM	1,777.0000	10	TQEX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.5000	17	CEUX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.5000	47	CEUX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.5000	9	AQEU
Genmab A/S	20/06/2024	10:56:54 AM	1,776.5000	4	TQEX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.5000	6	TQEX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.5000	70	XCSE
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	6	XCSE
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	1	XCSE
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	39	XCSE
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	20	XCSE
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	1	XCSE
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	60	XCSE
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	20	CEUX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	2	AQEU
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	5	TQEX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	20	CEUX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	20	CEUX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	3	CEUX
Genmab A/S	20/06/2024	10:56:54 AM	1,776.0000	1	AQEU
Genmab A/S	20/06/2024	10:59:12 AM	1,776.0000	21	XCSE
Genmab A/S	20/06/2024	10:59:12 AM	1,776.0000	21	XCSE
Genmab A/S	20/06/2024	10:59:12 AM	1,776.0000	23	XCSE
Genmab A/S	20/06/2024	10:59:12 AM	1,776.0000	21	XCSE
Genmab A/S	20/06/2024	10:59:12 AM	1,776.0000	21	XCSE
Genmab A/S	20/06/2024	11:01:26 AM	1,776.0000	33	CEUX
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	39	XCSE
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	35	XCSE
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	104	XCSE
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	34	CEUX
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	32	CEUX
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	10	CEUX
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	10	TQEX
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	14	TQEX
Genmab A/S	20/06/2024	11:02:30 AM	1,776.0000	16	CEUX
Genmab A/S	20/06/2024	11:04:46 AM	1,776.0000	95	CEUX
Genmab A/S	20/06/2024	11:04:46 AM	1,776.0000	9	TQEX
Genmab A/S	20/06/2024	11:04:46 AM	1,776.0000	5	TQEX
Genmab A/S	20/06/2024	11:04:46 AM	1,776.0000	36	CEUX
Genmab A/S	20/06/2024	11:04:46 AM	1,776.0000	6	CEUX
Genmab A/S	20/06/2024	11:04:46 AM	1,776.0000	1	TQEX
Genmab A/S	20/06/2024	11:06:15 AM	1,777.5000	10	CEUX
Genmab A/S	20/06/2024	11:06:15 AM	1,777.5000	26	CEUX
Genmab A/S	20/06/2024	11:06:32 AM	1,783.0000	17	CEUX
Genmab A/S	20/06/2024	11:06:32 AM	1,783.0000	10	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	56	XCSE
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	56	XCSE
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	56	XCSE

59

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	56	XCSE
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	21	XCSE
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	23	XCSE
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	51	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	51	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	37	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	51	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	37	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	14	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	8	AQEU
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	8	AQEU
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	8	AQEU
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	2	AQEU
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	8	AQEU
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	8	AQEU
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	2	AQEU
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	7	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	7	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	2	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	4	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	7	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	2	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	7	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	2	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	7	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,782.5000	2	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	18	XCSE
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	22	XCSE
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	18	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	20	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	18	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	20	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	12	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	13	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	5	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	15	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	5	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	14	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	10	CEUX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	3	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	5	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	1	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	1	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	2	TQEX
Genmab A/S	20/06/2024	11:06:36 AM	1,781.5000	10	CEUX
Genmab A/S	20/06/2024	11:06:41 AM	1,781.5000	22	XCSE
Genmab A/S	20/06/2024	11:06:41 AM	1,781.5000	43	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	22	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	1	XCSE

60

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	9	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	12	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	20	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	20	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	14	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	14	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	6	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	3	AQEU
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	3	AQEU
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	3	AQEU
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	1	AQEU
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	7	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	16	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	4	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	4	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	2	AQEU
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	9	AQEU
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	22	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	6	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	8	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	16	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	20	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,782.0000	40	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	4	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	8	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	36	CEUX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	2	AQEU
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	1	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	5	TQEX
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	20	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	4	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	12	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	8	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	8	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	12	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	11	XCSE
Genmab A/S	20/06/2024	11:08:51 AM	1,781.5000	26	XCSE
Genmab A/S	20/06/2024	11:11:56 AM	1,779.0000	8	CEUX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	26	XCSE
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	70	XCSE
Genmab A/S	20/06/2024	11:16:40 AM	1,781.5000	12	CEUX

61

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	6	CEUX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	19	CEUX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	25	CEUX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	25	CEUX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	11	CEUX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	4	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	9	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	3	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	3	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	1	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	2	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	4	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	5	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	4	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	4	AQEU
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	28	TQEX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	5	TQEX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	3	TQEX
Genmab A/S	20/06/2024	11:16:40 AM	1,783.5000	4	AQEU
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	20	XCSE
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	17	XCSE
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	3	XCSE
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	12	XCSE
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	19	CEUX
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	5	TQEX
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	15	CEUX
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	4	CEUX
Genmab A/S	20/06/2024	11:18:45 AM	1,783.0000	1	AQEU
Genmab A/S	20/06/2024	11:18:46 AM	1,783.0000	2	CEUX
Genmab A/S	20/06/2024	11:20:48 AM	1,782.5000	23	XCSE
Genmab A/S	20/06/2024	11:20:48 AM	1,782.5000	51	XCSE
Genmab A/S	20/06/2024	11:20:48 AM	1,782.5000	66	CEUX
Genmab A/S	20/06/2024	11:20:48 AM	1,782.5000	10	AQEU
Genmab A/S	20/06/2024	11:20:48 AM	1,782.5000	10	TQEX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	22	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	22	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	10	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	12	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	22	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	10	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	12	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	22	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	10	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	12	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	10	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	22	CEUX

62

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	22	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	22	CEUX
Genmab A/S	20/06/2024	11:22:43 AM	1,784.0000	8	CEUX
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	27	CEUX
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	54	XCSE
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	31	XCSE
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	23	XCSE
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	23	XCSE
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	18	XCSE
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	22	CEUX
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	49	CEUX
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	49	CEUX
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	36	XCSE
Genmab A/S	20/06/2024	11:24:57 AM	1,784.0000	18	XCSE
Genmab A/S	20/06/2024	11:27:10 AM	1,783.5000	2	AQEU
Genmab A/S	20/06/2024	11:28:19 AM	1,785.0000	10	XCSE
Genmab A/S	20/06/2024	11:28:19 AM	1,785.0000	6	XCSE
Genmab A/S	20/06/2024	11:28:19 AM	1,785.0000	6	XCSE
Genmab A/S	20/06/2024	11:28:24 AM	1,785.0000	40	CEUX
Genmab A/S	20/06/2024	11:28:47 AM	1,785.0000	3	XCSE
Genmab A/S	20/06/2024	11:28:48 AM	1,785.0000	34	XCSE
Genmab A/S	20/06/2024	11:29:06 AM	1,785.0000	33	CEUX
Genmab A/S	20/06/2024	11:29:21 AM	1,785.0000	18	CEUX
Genmab A/S	20/06/2024	11:29:21 AM	1,785.0000	21	CEUX
Genmab A/S	20/06/2024	11:29:40 AM	1,785.5000	6	CEUX
Genmab A/S	20/06/2024	11:29:40 AM	1,785.5000	9	CEUX
Genmab A/S	20/06/2024	11:29:40 AM	1,785.5000	25	CEUX
Genmab A/S	20/06/2024	11:30:02 AM	1,785.5000	36	CEUX
Genmab A/S	20/06/2024	11:30:02 AM	1,785.5000	2	CEUX
Genmab A/S	20/06/2024	11:30:51 AM	1,784.5000	17	XCSE
Genmab A/S	20/06/2024	11:30:51 AM	1,785.0000	76	XCSE
Genmab A/S	20/06/2024	11:30:51 AM	1,784.5000	7	XCSE
Genmab A/S	20/06/2024	11:31:16 AM	1,785.0000	2	XCSE
Genmab A/S	20/06/2024	11:31:17 AM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	11:31:17 AM	1,785.0000	15	CEUX
Genmab A/S	20/06/2024	11:31:43 AM	1,785.0000	35	XCSE
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	14	XCSE
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	35	XCSE
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	50	XCSE
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	13	XCSE
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	9	XCSE
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	27	XCSE
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	89	CEUX
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	10	CEUX
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	13	TQEX
Genmab A/S	20/06/2024	11:31:43 AM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	11:34:23 AM	1,785.5000	7	XCSE
Genmab A/S	20/06/2024	11:34:23 AM	1,785.5000	32	XCSE
Genmab A/S	20/06/2024	11:34:38 AM	1,785.5000	3	CEUX

63

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:34:38 AM	1,785.5000	6	XCSE
Genmab A/S	20/06/2024	11:34:38 AM	1,785.5000	26	XCSE
Genmab A/S	20/06/2024	11:35:15 AM	1,786.0000	40	XCSE
Genmab A/S	20/06/2024	11:35:19 AM	1,786.0000	27	XCSE
Genmab A/S	20/06/2024	11:35:36 AM	1,786.0000	19	CEUX
Genmab A/S	20/06/2024	11:35:36 AM	1,786.0000	16	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	64	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	17	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	35	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	17	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	34	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	75	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	5	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	72	CEUX
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	16	CEUX
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	11	TQEX
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	56	CEUX
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	2	CEUX
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	3	AQEU
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	27	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	50	CEUX
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	43	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	31	XCSE
Genmab A/S	20/06/2024	11:35:46 AM	1,785.5000	2	XCSE
Genmab A/S	20/06/2024	11:41:03 AM	1,785.5000	9	AQEU
Genmab A/S	20/06/2024	11:41:03 AM	1,785.5000	14	AQEU
Genmab A/S	20/06/2024	11:41:03 AM	1,785.5000	9	AQEU
Genmab A/S	20/06/2024	11:41:19 AM	1,785.5000	28	CEUX
Genmab A/S	20/06/2024	11:41:19 AM	1,785.5000	9	TQEX
Genmab A/S	20/06/2024	11:41:39 AM	1,785.5000	34	TQEX
Genmab A/S	20/06/2024	11:42:00 AM	1,785.5000	5	XCSE
Genmab A/S	20/06/2024	11:42:00 AM	1,785.5000	32	XCSE
Genmab A/S	20/06/2024	11:42:05 AM	1,785.0000	24	XCSE
Genmab A/S	20/06/2024	11:42:05 AM	1,785.0000	8	XCSE
Genmab A/S	20/06/2024	11:42:05 AM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	11:42:05 AM	1,785.0000	1	CEUX
Genmab A/S	20/06/2024	11:42:05 AM	1,785.0000	1	AQEU
Genmab A/S	20/06/2024	11:42:05 AM	1,785.0000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,786.0000	7	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,786.0000	3	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	6	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	6	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	CEUX

64

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	10	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	1	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	1	AQEU
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,786.5000	9	AQEU
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	13	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	13	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	1	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	10	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	10	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	10	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	3	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	9	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	1	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	3	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	3	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	11	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	XCSE

65

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	9	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	11	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	10	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	5	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	14	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	36	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	9	AQEU
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	2	AQEU
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	9	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	4	TQEX
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	16	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	8	XCSE
Genmab A/S	20/06/2024	11:45:50 AM	1,785.5000	2	AQEU
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	18	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	4	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	11	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	7	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	1	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	7	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	3	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	7	XCSE
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	18	CEUX
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	18	CEUX
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	5	TQEX
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	5	TQEX
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	11	CEUX
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	7	CEUX
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	5	TQEX
Genmab A/S	20/06/2024	11:48:05 AM	1,787.0000	9	CEUX
Genmab A/S	20/06/2024	11:49:07 AM	1,786.0000	7	AQEU
Genmab A/S	20/06/2024	11:51:09 AM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	11:51:40 AM	1,786.5000	35	XCSE
Genmab A/S	20/06/2024	11:51:47 AM	1,786.5000	35	XCSE
Genmab A/S	20/06/2024	11:52:38 AM	1,787.0000	76	CEUX
Genmab A/S	20/06/2024	11:52:51 AM	1,787.0000	38	XCSE
Genmab A/S	20/06/2024	11:52:57 AM	1,786.5000	20	XCSE
Genmab A/S	20/06/2024	11:52:57 AM	1,786.5000	14	XCSE

66

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:52:57 AM	1,786.5000	51	XCSE
Genmab A/S	20/06/2024	11:52:57 AM	1,786.5000	6	XCSE
Genmab A/S	20/06/2024	11:52:57 AM	1,786.5000	47	CEUX
Genmab A/S	20/06/2024	11:52:57 AM	1,786.5000	7	TQEX
Genmab A/S	20/06/2024	11:54:58 AM	1,788.5000	3	CEUX
Genmab A/S	20/06/2024	11:54:58 AM	1,788.5000	26	CEUX
Genmab A/S	20/06/2024	11:54:58 AM	1,788.5000	35	CEUX
Genmab A/S	20/06/2024	11:54:58 AM	1,788.5000	3	CEUX
Genmab A/S	20/06/2024	11:55:12 AM	1,788.5000	3	CEUX
Genmab A/S	20/06/2024	11:55:12 AM	1,788.5000	17	XCSE
Genmab A/S	20/06/2024	11:55:12 AM	1,788.5000	20	XCSE
Genmab A/S	20/06/2024	11:55:35 AM	1,788.5000	3	CEUX
Genmab A/S	20/06/2024	11:55:35 AM	1,788.5000	9	CEUX
Genmab A/S	20/06/2024	11:55:35 AM	1,788.5000	25	CEUX
Genmab A/S	20/06/2024	11:55:35 AM	1,788.5000	3	XCSE
Genmab A/S	20/06/2024	11:55:58 AM	1,788.5000	4	CEUX
Genmab A/S	20/06/2024	11:55:58 AM	1,788.5000	9	CEUX
Genmab A/S	20/06/2024	11:55:58 AM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	11:55:58 AM	1,788.5000	2	XCSE
Genmab A/S	20/06/2024	11:55:58 AM	1,788.5000	10	XCSE
Genmab A/S	20/06/2024	11:55:58 AM	1,788.5000	3	XCSE
Genmab A/S	20/06/2024	11:56:18 AM	1,788.0000	11	CEUX
Genmab A/S	20/06/2024	11:56:18 AM	1,788.0000	20	XCSE
Genmab A/S	20/06/2024	11:56:18 AM	1,788.0000	2	XCSE
Genmab A/S	20/06/2024	11:56:50 AM	1,788.5000	2	AQEU
Genmab A/S	20/06/2024	11:56:53 AM	1,788.5000	18	TQEX
Genmab A/S	20/06/2024	11:56:53 AM	1,788.5000	19	TQEX
Genmab A/S	20/06/2024	11:57:02 AM	1,788.5000	40	TQEX
Genmab A/S	20/06/2024	11:57:06 AM	1,788.0000	36	XCSE
Genmab A/S	20/06/2024	11:57:06 AM	1,788.0000	9	XCSE
Genmab A/S	20/06/2024	11:57:06 AM	1,788.0000	3	XCSE
Genmab A/S	20/06/2024	11:57:06 AM	1,788.0000	9	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	45	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	20	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	50	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	4	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	49	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	3	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	2	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	45	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	39	AQEU
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	5	AQEU
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	2	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	46	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	45	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	6	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	2	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	28	CEUX

67

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	4	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	5	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	38	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	6	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	38	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	4	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	2	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	6	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	9	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	45	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	6	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	43	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	40	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	12	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	3	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	37	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	42	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	3	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	2	AQEU
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	6	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	40	XCSE
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	45	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	14	CEUX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	3	AQEU
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	4	AQEU
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	4	AQEU
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	6	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	6	TQEX
Genmab A/S	20/06/2024	11:58:27 AM	1,788.5000	32	XCSE
Genmab A/S	20/06/2024	12:02:31 PM	1,787.0000	17	XCSE
Genmab A/S	20/06/2024	12:02:31 PM	1,787.0000	40	XCSE
Genmab A/S	20/06/2024	12:02:32 PM	1,787.0000	41	XCSE
Genmab A/S	20/06/2024	12:02:32 PM	1,787.0000	102	XCSE
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	18	XCSE
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	44	XCSE
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	18	CEUX
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	2	AQEU
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	2	AQEU
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	2	AQEU
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	5	TQEX
Genmab A/S	20/06/2024	12:02:33 PM	1,786.5000	18	CEUX
Genmab A/S	20/06/2024	12:02:34 PM	1,786.5000	43	XCSE
Genmab A/S	20/06/2024	12:02:34 PM	1,786.5000	58	XCSE
Genmab A/S	20/06/2024	12:04:15 PM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	12:04:15 PM	1,785.5000	13	CEUX
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	21	XCSE
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	47	XCSE
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	20	CEUX

68

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	5	TQEX
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	3	CEUX
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	19	XCSE
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	14	XCSE
Genmab A/S	20/06/2024	12:04:46 PM	1,785.0000	10	XCSE
Genmab A/S	20/06/2024	12:04:47 PM	1,785.0000	4	XCSE
Genmab A/S	20/06/2024	12:09:11 PM	1,785.5000	40	XCSE
Genmab A/S	20/06/2024	12:09:11 PM	1,785.5000	43	XCSE
Genmab A/S	20/06/2024	12:09:11 PM	1,785.5000	6	XCSE
Genmab A/S	20/06/2024	12:15:22 PM	1,788.0000	20	CEUX
Genmab A/S	20/06/2024	12:15:22 PM	1,788.0000	21	XCSE
Genmab A/S	20/06/2024	12:15:22 PM	1,788.0000	21	XCSE
Genmab A/S	20/06/2024	12:15:22 PM	1,788.0000	20	CEUX
Genmab A/S	20/06/2024	12:15:43 PM	1,788.5000	26	CEUX
Genmab A/S	20/06/2024	12:15:43 PM	1,788.5000	12	CEUX
Genmab A/S	20/06/2024	12:15:43 PM	1,788.5000	1	CEUX
Genmab A/S	20/06/2024	12:15:47 PM	1,788.5000	29	CEUX
Genmab A/S	20/06/2024	12:15:47 PM	1,788.5000	32	XCSE
Genmab A/S	20/06/2024	12:15:47 PM	1,788.5000	32	XCSE
Genmab A/S	20/06/2024	12:15:47 PM	1,788.5000	21	CEUX
Genmab A/S	20/06/2024	12:15:47 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:15:55 PM	1,788.0000	2	CEUX
Genmab A/S	20/06/2024	12:15:55 PM	1,788.0000	10	CEUX
Genmab A/S	20/06/2024	12:15:55 PM	1,788.0000	12	XCSE
Genmab A/S	20/06/2024	12:21:42 PM	1,788.0000	47	CEUX
Genmab A/S	20/06/2024	12:21:42 PM	1,788.0000	2	CEUX
Genmab A/S	20/06/2024	12:21:42 PM	1,788.0000	5	TQEX
Genmab A/S	20/06/2024	12:21:42 PM	1,788.0000	5	TQEX
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	17	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	36	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	9	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	4	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	1	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	5	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	43	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	9	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	23	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	53	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	9	XCSE
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	7	CEUX
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	47	CEUX
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	1	AQEU
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	1	TQEX
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	3	TQEX
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	1	TQEX

69

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	9	CEUX
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	5	CEUX
Genmab A/S	20/06/2024	12:21:48 PM	1,788.0000	21	XCSE
Genmab A/S	20/06/2024	12:21:51 PM	1,788.0000	30	XCSE
Genmab A/S	20/06/2024	12:21:51 PM	1,788.0000	2	XCSE
Genmab A/S	20/06/2024	12:21:51 PM	1,788.0000	9	XCSE
Genmab A/S	20/06/2024	12:21:52 PM	1,788.0000	39	CEUX
Genmab A/S	20/06/2024	12:21:52 PM	1,788.0000	2	AQEU
Genmab A/S	20/06/2024	12:21:52 PM	1,788.0000	13	XCSE
Genmab A/S	20/06/2024	12:22:03 PM	1,788.0000	2	XCSE
Genmab A/S	20/06/2024	12:22:21 PM	1,788.0000	47	XCSE
Genmab A/S	20/06/2024	12:22:21 PM	1,788.0000	101	XCSE
Genmab A/S	20/06/2024	12:22:30 PM	1,788.0000	40	CEUX
Genmab A/S	20/06/2024	12:22:38 PM	1,787.5000	51	XCSE
Genmab A/S	20/06/2024	12:23:20 PM	1,788.0000	11	CEUX
Genmab A/S	20/06/2024	12:23:20 PM	1,788.0000	28	CEUX
Genmab A/S	20/06/2024	12:23:59 PM	1,788.0000	35	XCSE
Genmab A/S	20/06/2024	12:24:11 PM	1,788.0000	12	XCSE
Genmab A/S	20/06/2024	12:24:11 PM	1,788.0000	25	XCSE
Genmab A/S	20/06/2024	12:25:11 PM	1,788.5000	13	CEUX
Genmab A/S	20/06/2024	12:25:11 PM	1,788.5000	11	TQEX
Genmab A/S	20/06/2024	12:25:11 PM	1,788.5000	10	XCSE
Genmab A/S	20/06/2024	12:25:11 PM	1,788.5000	2	XCSE
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	4	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	5	TQEX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	5	TQEX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	72	XCSE
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	2	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	5	TQEX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	5	TQEX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	CEUX
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	12:26:56 PM	1,788.5000	8	XCSE
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	76	XCSE
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	76	XCSE

70

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	36	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	33	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	69	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	14	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	33	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	33	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	3	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	12	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	10	AQEU
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	10	AQEU
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	10	AQEU
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	11	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	11	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	11	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	10	AQEU
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	4	AQEU
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	11	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	2	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	6	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	10	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	5	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	2	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	3	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	14	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	21	CEUX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	5	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	5	TQEX
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	46	XCSE
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	30	XCSE
Genmab A/S	20/06/2024	12:27:35 PM	1,788.0000	29	XCSE
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	22	XCSE
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	22	XCSE
Genmab A/S	20/06/2024	12:27:35 PM	1,787.5000	7	XCSE
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	50	XCSE
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	114	XCSE
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	14	XCSE
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	44	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	44	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	44	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	31	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	AQEU
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	AQEU
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	AQEU
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	3	AQEU
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	3	AQEU
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	TQEX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	TQEX

71

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	TQEX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	TQEX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	3	TQEX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	7	TQEX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	4	TQEX
Genmab A/S	20/06/2024	12:33:43 PM	1,786.0000	21	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,785.5000	20	XCSE
Genmab A/S	20/06/2024	12:33:43 PM	1,785.5000	15	XCSE
Genmab A/S	20/06/2024	12:33:43 PM	1,785.5000	20	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,785.5000	12	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,785.5000	5	CEUX
Genmab A/S	20/06/2024	12:33:43 PM	1,785.5000	2	AQEU
Genmab A/S	20/06/2024	12:33:43 PM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	12:33:45 PM	1,785.5000	1	AQEU
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	56	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	23	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	37	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	5	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	11	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	7	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	5	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	7	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	51	CEUX
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	7	TQEX
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	5	CEUX
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	3	CEUX
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	23	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	23	XCSE
Genmab A/S	20/06/2024	12:38:34 PM	1,785.0000	21	XCSE
Genmab A/S	20/06/2024	12:38:35 PM	1,785.0000	10	XCSE
Genmab A/S	20/06/2024	12:38:40 PM	1,784.5000	22	XCSE
Genmab A/S	20/06/2024	12:38:40 PM	1,784.5000	44	XCSE
Genmab A/S	20/06/2024	12:38:40 PM	1,784.5000	22	XCSE
Genmab A/S	20/06/2024	12:38:40 PM	1,784.5000	44	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	37	CEUX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	37	CEUX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	18	CEUX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	1	AQEU
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	5	TQEX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	5	TQEX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	40	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	40	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	4	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	35	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	5	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	26	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	37	CEUX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	8	CEUX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	5	AQEU

72

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	5	TQEX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	36	CEUX
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	9	AQEU
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	12	XCSE
Genmab A/S	20/06/2024	12:40:19 PM	1,784.0000	12	XCSE
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	17	CEUX
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	17	CEUX
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	10	CEUX
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	2	AQEU
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	9	AQEU
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	5	TQEX
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	19	TQEX
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	18	XCSE
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	26	XCSE
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	42	CEUX
Genmab A/S	20/06/2024	12:41:05 PM	1,782.5000	14	CEUX
Genmab A/S	20/06/2024	12:51:00 PM	1,783.0000	22	CEUX
Genmab A/S	20/06/2024	12:51:00 PM	1,783.0000	22	XCSE
Genmab A/S	20/06/2024	12:51:08 PM	1,783.0000	19	CEUX
Genmab A/S	20/06/2024	12:51:10 PM	1,783.0000	40	CEUX
Genmab A/S	20/06/2024	12:51:11 PM	1,783.0000	40	CEUX
Genmab A/S	20/06/2024	12:51:18 PM	1,782.5000	7	CEUX
Genmab A/S	20/06/2024	12:51:47 PM	1,783.0000	39	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	36	CEUX
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	1	CEUX
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	71	CEUX
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	36	CEUX
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	36	CEUX
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	28	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	11	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	39	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	41	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	39	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	11	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	11	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	28	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	22	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	24	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	15	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	7	XCSE
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	36	CEUX
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	10	CEUX
Genmab A/S	20/06/2024	12:53:27 PM	1,784.0000	24	CEUX
Genmab A/S	20/06/2024	12:57:40 PM	1,785.5000	9	TQEX
Genmab A/S	20/06/2024	12:57:40 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	12:57:48 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	12:57:48 PM	1,785.5000	20	XCSE
Genmab A/S	20/06/2024	12:57:48 PM	1,785.5000	7	XCSE
Genmab A/S	20/06/2024	12:57:48 PM	1,785.5000	9	XCSE

73

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	12:58:11 PM	1,785.5000	34	CEUX
Genmab A/S	20/06/2024	12:58:33 PM	1,785.5000	36	CEUX
Genmab A/S	20/06/2024	12:58:54 PM	1,785.5000	36	XCSE
Genmab A/S	20/06/2024	12:59:21 PM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	12:59:21 PM	1,785.5000	8	CEUX
Genmab A/S	20/06/2024	12:59:21 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	12:59:21 PM	1,785.5000	14	TQEX
Genmab A/S	20/06/2024	12:59:21 PM	1,785.5000	10	TQEX
Genmab A/S	20/06/2024	12:59:41 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	12:59:41 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	12:59:41 PM	1,785.5000	8	XCSE
Genmab A/S	20/06/2024	12:59:41 PM	1,785.5000	8	XCSE
Genmab A/S	20/06/2024	12:59:41 PM	1,785.5000	5	XCSE
Genmab A/S	20/06/2024	12:59:41 PM	1,785.5000	10	XCSE
Genmab A/S	20/06/2024	1:00:26 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:00:26 PM	1,785.5000	1	CEUX
Genmab A/S	20/06/2024	1:00:26 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	10	CEUX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	1:00:35 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:36 PM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	1:00:36 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:36 PM	1,785.5000	4	CEUX
Genmab A/S	20/06/2024	1:00:36 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:42 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:00:42 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:48 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:00:48 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:00:54 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:00:54 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:01:01 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:01:01 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:03:04 PM	1,785.5000	12	CEUX
Genmab A/S	20/06/2024	1:03:04 PM	1,785.5000	9	CEUX
Genmab A/S	20/06/2024	1:03:04 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:03:04 PM	1,785.5000	1	TQEX
Genmab A/S	20/06/2024	1:03:04 PM	1,785.5000	9	TQEX
Genmab A/S	20/06/2024	1:03:04 PM	1,785.5000	3	CEUX
Genmab A/S	20/06/2024	1:03:06 PM	1,785.5000	7	XCSE
Genmab A/S	20/06/2024	1:03:40 PM	1,785.0000	9	CEUX
Genmab A/S	20/06/2024	1:05:03 PM	1,785.5000	18	CEUX
Genmab A/S	20/06/2024	1:05:03 PM	1,785.5000	18	CEUX
Genmab A/S	20/06/2024	1:05:03 PM	1,785.5000	2	AQEU

74

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	1:05:03 PM	1,785.5000	2	AQEU
Genmab A/S	20/06/2024	1:05:03 PM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	18	CEUX
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	39	CEUX
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	2	AQEU
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	6	AQEU
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	6	TQEX
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	18	XCSE
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	43	XCSE
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	13	XCSE
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	5	XCSE
Genmab A/S	20/06/2024	1:05:44 PM	1,785.5000	38	XCSE
Genmab A/S	20/06/2024	1:08:08 PM	1,790.5000	14	CEUX
Genmab A/S	20/06/2024	1:08:08 PM	1,790.5000	9	CEUX
Genmab A/S	20/06/2024	1:08:08 PM	1,790.5000	11	AQEU
Genmab A/S	20/06/2024	1:08:08 PM	1,790.5000	9	AQEU
Genmab A/S	20/06/2024	1:08:08 PM	1,790.5000	20	TQEX
Genmab A/S	20/06/2024	1:08:08 PM	1,790.5000	7	TQEX
Genmab A/S	20/06/2024	1:08:08 PM	1,790.5000	9	TQEX
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	47	XCSE
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	11	XCSE
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	47	XCSE
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	43	CEUX
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	9	CEUX
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	9	CEUX
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	6	AQEU
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	3	CEUX
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	24	XCSE
Genmab A/S	20/06/2024	1:08:26 PM	1,789.5000	44	XCSE
Genmab A/S	20/06/2024	1:08:31 PM	1,789.5000	36	XCSE
Genmab A/S	20/06/2024	1:08:31 PM	1,789.5000	8	XCSE
Genmab A/S	20/06/2024	1:08:31 PM	1,789.5000	16	XCSE
Genmab A/S	20/06/2024	1:08:31 PM	1,789.5000	28	XCSE
Genmab A/S	20/06/2024	1:08:31 PM	1,789.5000	12	XCSE
Genmab A/S	20/06/2024	1:08:31 PM	1,789.5000	24	XCSE
Genmab A/S	20/06/2024	1:08:31 PM	1,789.5000	7	XCSE
Genmab A/S	20/06/2024	1:10:18 PM	1,789.5000	24	XCSE
Genmab A/S	20/06/2024	1:10:18 PM	1,789.5000	20	XCSE
Genmab A/S	20/06/2024	1:10:18 PM	1,789.5000	20	XCSE
Genmab A/S	20/06/2024	1:10:24 PM	1,789.5000	24	XCSE
Genmab A/S	20/06/2024	1:10:24 PM	1,789.5000	87	XCSE
Genmab A/S	20/06/2024	1:10:50 PM	1,789.5000	39	CEUX
Genmab A/S	20/06/2024	1:11:37 PM	1,789.5000	72	CEUX
Genmab A/S	20/06/2024	1:11:38 PM	1,789.0000	75	XCSE
Genmab A/S	20/06/2024	1:11:38 PM	1,789.0000	75	XCSE
Genmab A/S	20/06/2024	1:11:38 PM	1,789.0000	17	XCSE
Genmab A/S	20/06/2024	1:11:38 PM	1,789.0000	52	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	9	CEUX

75

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	29	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	22	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	22	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	22	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	7	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	22	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	4	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	4	AQEU
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	13	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	5	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	4	AQEU
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	25	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	24	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	1	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	24	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	22	CEUX
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	3	AQEU
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	11	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	5	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	9	XCSE
Genmab A/S	20/06/2024	1:11:39 PM	1,788.0000	22	CEUX
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	10	XCSE
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	4	XCSE
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	11	XCSE
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	4	XCSE
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	15	XCSE
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	1	CEUX
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	10	XCSE
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	25	XCSE
Genmab A/S	20/06/2024	1:11:40 PM	1,788.0000	2	XCSE
Genmab A/S	20/06/2024	1:18:02 PM	1,788.0000	11	XCSE
Genmab A/S	20/06/2024	1:18:02 PM	1,788.0000	10	CEUX
Genmab A/S	20/06/2024	1:18:30 PM	1,788.5000	20	AQEU
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	XCSE
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	37	XCSE
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	187	XCSE
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	1	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX

76

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	10	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	7	CEUX
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	2	AQEU
Genmab A/S	20/06/2024	1:19:07 PM	1,788.5000	7	XCSE
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	16	XCSE
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	32	XCSE
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	4	XCSE
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	14	XCSE
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	43	CEUX
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	18	CEUX
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	6	AQEU
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	6	AQEU
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	7	TQEX
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	7	TQEX
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	7	TQEX
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	7	TQEX
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	46	CEUX
Genmab A/S	20/06/2024	1:22:43 PM	1,790.0000	4	CEUX
Genmab A/S	20/06/2024	1:25:35 PM	1,790.0000	10	AQEU
Genmab A/S	20/06/2024	1:25:35 PM	1,790.0000	5	TQEX
Genmab A/S	20/06/2024	1:25:35 PM	1,790.0000	13	TQEX
Genmab A/S	20/06/2024	1:25:55 PM	1,790.0000	38	CEUX
Genmab A/S	20/06/2024	1:26:22 PM	1,790.0000	37	CEUX
Genmab A/S	20/06/2024	1:26:41 PM	1,790.0000	9	XCSE
Genmab A/S	20/06/2024	1:29:21 PM	1,791.0000	40	CEUX
Genmab A/S	20/06/2024	1:29:21 PM	1,791.0000	3	CEUX
Genmab A/S	20/06/2024	1:29:21 PM	1,791.0000	8	XCSE
Genmab A/S	20/06/2024	1:29:21 PM	1,791.0000	30	XCSE
Genmab A/S	20/06/2024	1:29:21 PM	1,791.0000	7	XCSE
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	7	CEUX
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	5	CEUX
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	4	CEUX
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	10	CEUX
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	29	CEUX
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	3	CEUX
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	11	CEUX
Genmab A/S	20/06/2024	1:29:28 PM	1,791.5000	38	CEUX
Genmab A/S	20/06/2024	1:29:43 PM	1,791.5000	3	CEUX
Genmab A/S	20/06/2024	1:29:54 PM	1,791.5000	3	CEUX
Genmab A/S	20/06/2024	1:29:55 PM	1,791.5000	4	CEUX
Genmab A/S	20/06/2024	1:29:55 PM	1,791.5000	3	CEUX
Genmab A/S	20/06/2024	1:29:55 PM	1,791.5000	3	CEUX
Genmab A/S	20/06/2024	1:29:55 PM	1,791.5000	3	CEUX
Genmab A/S	20/06/2024	1:29:55 PM	1,791.5000	4	CEUX
Genmab A/S	20/06/2024	1:29:56 PM	1,791.5000	4	CEUX

77

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	1:30:05 PM	1,791.0000	3	XCSE
Genmab A/S	20/06/2024	1:30:05 PM	1,791.0000	25	XCSE
Genmab A/S	20/06/2024	1:30:16 PM	1,791.0000	10	CEUX
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	10	XCSE
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	18	XCSE
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	24	XCSE
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	28	XCSE
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	24	XCSE
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	16	CEUX
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	28	XCSE
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	22	XCSE
Genmab A/S	20/06/2024	1:30:34 PM	1,791.0000	2	XCSE
Genmab A/S	20/06/2024	1:30:35 PM	1,791.0000	3	XCSE
Genmab A/S	20/06/2024	1:30:35 PM	1,791.0000	15	XCSE
Genmab A/S	20/06/2024	1:30:35 PM	1,791.0000	10	XCSE
Genmab A/S	20/06/2024	1:30:35 PM	1,791.0000	24	XCSE
Genmab A/S	20/06/2024	1:30:35 PM	1,791.0000	15	XCSE
Genmab A/S	20/06/2024	1:30:35 PM	1,791.0000	8	XCSE
Genmab A/S	20/06/2024	1:30:35 PM	1,791.0000	26	CEUX
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	20	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	15	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	35	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	26	CEUX
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	26	CEUX
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	4	AQEU
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	28	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	7	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	22	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	3	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	2	XCSE
Genmab A/S	20/06/2024	1:30:39 PM	1,791.0000	26	CEUX
Genmab A/S	20/06/2024	1:33:37 PM	1,790.5000	9	CEUX
Genmab A/S	20/06/2024	1:33:37 PM	1,790.5000	1	AQEU
Genmab A/S	20/06/2024	1:33:37 PM	1,790.5000	9	XCSE
Genmab A/S	20/06/2024	1:33:37 PM	1,790.5000	9	XCSE
Genmab A/S	20/06/2024	1:33:37 PM	1,790.5000	9	XCSE
Genmab A/S	20/06/2024	1:33:37 PM	1,790.5000	27	XCSE
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	9	CEUX
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	5	CEUX
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	5	CEUX
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	5	TQEX
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	5	TQEX
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	4	CEUX
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	1	AQEU
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	5	TQEX
Genmab A/S	20/06/2024	1:33:38 PM	1,790.5000	9	XCSE
Genmab A/S	20/06/2024	1:35:39 PM	1,790.5000	10	AQEU
Genmab A/S	20/06/2024	1:35:39 PM	1,790.5000	1	TQEX
Genmab A/S	20/06/2024	1:35:39 PM	1,790.5000	12	TQEX

78

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	1:36:31 PM	1,790.5000	10	CEUX
Genmab A/S	20/06/2024	1:37:37 PM	1,792.0000	12	XCSE
Genmab A/S	20/06/2024	1:37:39 PM	1,792.0000	9	XCSE
Genmab A/S	20/06/2024	1:37:43 PM	1,792.0000	21	CEUX
Genmab A/S	20/06/2024	1:37:44 PM	1,792.0000	21	CEUX
Genmab A/S	20/06/2024	1:37:44 PM	1,792.0000	21	CEUX
Genmab A/S	20/06/2024	1:37:44 PM	1,792.0000	20	CEUX
Genmab A/S	20/06/2024	1:37:44 PM	1,792.0000	22	XCSE
Genmab A/S	20/06/2024	1:37:44 PM	1,792.0000	2	XCSE
Genmab A/S	20/06/2024	1:37:44 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	1:37:44 PM	1,792.0000	21	CEUX
Genmab A/S	20/06/2024	1:37:46 PM	1,792.0000	22	CEUX
Genmab A/S	20/06/2024	1:37:46 PM	1,792.0000	5	CEUX
Genmab A/S	20/06/2024	1:38:45 PM	1,792.5000	4	XCSE
Genmab A/S	20/06/2024	1:38:45 PM	1,792.5000	110	XCSE
Genmab A/S	20/06/2024	1:38:45 PM	1,792.5000	3	XCSE
Genmab A/S	20/06/2024	1:39:10 PM	1,792.0000	10	CEUX
Genmab A/S	20/06/2024	1:39:13 PM	1,792.5000	5	XCSE
Genmab A/S	20/06/2024	1:39:13 PM	1,792.5000	7	XCSE
Genmab A/S	20/06/2024	1:39:41 PM	1,793.0000	7	XCSE
Genmab A/S	20/06/2024	1:39:41 PM	1,793.0000	25	XCSE
Genmab A/S	20/06/2024	1:39:41 PM	1,793.0000	10	XCSE
Genmab A/S	20/06/2024	1:39:41 PM	1,793.0000	10	XCSE
Genmab A/S	20/06/2024	1:40:41 PM	1,793.0000	10	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	70	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	48	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	11	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	48	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	11	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	1	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	44	CEUX
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	11	CEUX
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	11	CEUX
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	11	CEUX
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	22	CEUX
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	28	CEUX
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	39	XCSE
Genmab A/S	20/06/2024	1:40:51 PM	1,793.0000	44	CEUX
Genmab A/S	20/06/2024	1:40:52 PM	1,793.0000	9	XCSE
Genmab A/S	20/06/2024	1:40:52 PM	1,793.0000	44	CEUX
Genmab A/S	20/06/2024	1:40:52 PM	1,793.0000	6	CEUX
Genmab A/S	20/06/2024	1:40:52 PM	1,793.0000	1	CEUX
Genmab A/S	20/06/2024	1:42:41 PM	1,792.0000	10	XCSE
Genmab A/S	20/06/2024	1:43:18 PM	1,792.0000	42	XCSE
Genmab A/S	20/06/2024	1:43:18 PM	1,792.0000	4	CEUX
Genmab A/S	20/06/2024	1:44:17 PM	1,792.0000	52	XCSE
Genmab A/S	20/06/2024	1:44:17 PM	1,792.0000	101	XCSE
Genmab A/S	20/06/2024	1:44:17 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	1:46:01 PM	1,792.0000	59	XCSE

79

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	1:46:01 PM	1,792.0000	59	XCSE
Genmab A/S	20/06/2024	1:46:02 PM	1,792.0000	54	CEUX
Genmab A/S	20/06/2024	1:46:02 PM	1,792.0000	8	TQEX
Genmab A/S	20/06/2024	1:46:02 PM	1,792.0000	17	XCSE
Genmab A/S	20/06/2024	1:49:28 PM	1,794.5000	34	CEUX
Genmab A/S	20/06/2024	1:49:28 PM	1,794.5000	46	CEUX
Genmab A/S	20/06/2024	1:49:28 PM	1,794.5000	9	XCSE
Genmab A/S	20/06/2024	1:49:28 PM	1,794.5000	51	XCSE
Genmab A/S	20/06/2024	1:49:41 PM	1,794.5000	8	AQEU
Genmab A/S	20/06/2024	1:49:41 PM	1,794.5000	68	AQEU
Genmab A/S	20/06/2024	1:49:41 PM	1,794.5000	8	AQEU
Genmab A/S	20/06/2024	1:49:41 PM	1,794.5000	52	XCSE
Genmab A/S	20/06/2024	1:50:06 PM	1,796.5000	33	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	20	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	85	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	53	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	14	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	11	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	38	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	10	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	48	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	43	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	48	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	9	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	7	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	7	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	1	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	6	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	1	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	7	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	7	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	7	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	1	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	8	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	8	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	1	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	8	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	8	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	4	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	1	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,796.5000	8	TQEX
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	20	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	18	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	5	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	13	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	5	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	3	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	18	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	12	CEUX

80

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	3	AQEU
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	17	CEUX
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	5	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	15	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	41	XCSE
Genmab A/S	20/06/2024	1:50:17 PM	1,795.5000	41	XCSE
Genmab A/S	20/06/2024	1:50:20 PM	1,795.5000	13	XCSE
Genmab A/S	20/06/2024	1:58:39 PM	1,796.0000	1	CEUX
Genmab A/S	20/06/2024	1:58:39 PM	1,796.0000	32	XCSE
Genmab A/S	20/06/2024	1:58:39 PM	1,796.0000	6	XCSE
Genmab A/S	20/06/2024	2:01:02 PM	1,796.0000	12	XCSE
Genmab A/S	20/06/2024	2:01:02 PM	1,796.0000	2	XCSE
Genmab A/S	20/06/2024	2:01:03 PM	1,796.0000	22	CEUX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	20	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	22	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	12	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	13	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	9	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	17	CEUX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	12	CEUX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	41	CEUX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	6	TQEX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	12	CEUX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	12	CEUX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	6	TQEX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	6	TQEX
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	3	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	5	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	16	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	50	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	1	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	5	XCSE
Genmab A/S	20/06/2024	2:01:22 PM	1,796.0000	7	XCSE
Genmab A/S	20/06/2024	2:01:31 PM	1,796.0000	12	XCSE
Genmab A/S	20/06/2024	2:01:31 PM	1,796.0000	12	XCSE
Genmab A/S	20/06/2024	2:01:31 PM	1,796.0000	12	XCSE
Genmab A/S	20/06/2024	2:01:31 PM	1,796.0000	6	CEUX
Genmab A/S	20/06/2024	2:01:31 PM	1,796.0000	6	CEUX
Genmab A/S	20/06/2024	2:01:31 PM	1,796.0000	6	CEUX
Genmab A/S	20/06/2024	2:02:16 PM	1,796.5000	8	CEUX
Genmab A/S	20/06/2024	2:02:16 PM	1,796.5000	8	CEUX
Genmab A/S	20/06/2024	2:02:16 PM	1,796.5000	5	TQEX
Genmab A/S	20/06/2024	2:02:16 PM	1,796.5000	8	XCSE
Genmab A/S	20/06/2024	2:03:11 PM	1,797.0000	1	AQEU
Genmab A/S	20/06/2024	2:03:11 PM	1,797.0000	10	AQEU
Genmab A/S	20/06/2024	2:03:42 PM	1,796.5000	1	AQEU
Genmab A/S	20/06/2024	2:03:42 PM	1,796.5000	3	CEUX
Genmab A/S	20/06/2024	2:03:42 PM	1,796.5000	1	AQEU
Genmab A/S	20/06/2024	2:04:44 PM	1,797.0000	93	XCSE

81

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:04:44 PM	1,797.0000	67	XCSE
Genmab A/S	20/06/2024	2:04:44 PM	1,797.0000	26	XCSE
Genmab A/S	20/06/2024	2:04:44 PM	1,797.0000	3	XCSE
Genmab A/S	20/06/2024	2:04:44 PM	1,797.0000	30	XCSE
Genmab A/S	20/06/2024	2:04:44 PM	1,797.0000	60	XCSE
Genmab A/S	20/06/2024	2:05:53 PM	1,797.0000	31	XCSE
Genmab A/S	20/06/2024	2:05:53 PM	1,797.5000	14	XCSE
Genmab A/S	20/06/2024	2:05:53 PM	1,797.5000	26	XCSE
Genmab A/S	20/06/2024	2:06:13 PM	1,797.5000	26	XCSE
Genmab A/S	20/06/2024	2:06:47 PM	1,799.0000	14	CEUX
Genmab A/S	20/06/2024	2:06:47 PM	1,799.0000	10	XCSE
Genmab A/S	20/06/2024	2:06:47 PM	1,799.0000	11	XCSE
Genmab A/S	20/06/2024	2:06:47 PM	1,799.0000	29	XCSE
Genmab A/S	20/06/2024	2:06:47 PM	1,799.0000	4	XCSE
Genmab A/S	20/06/2024	2:07:07 PM	1,799.5000	12	CEUX
Genmab A/S	20/06/2024	2:07:07 PM	1,799.5000	15	XCSE
Genmab A/S	20/06/2024	2:07:07 PM	1,799.5000	10	XCSE
Genmab A/S	20/06/2024	2:07:27 PM	1,799.5000	2	AQEU
Genmab A/S	20/06/2024	2:07:27 PM	1,799.5000	16	AQEU
Genmab A/S	20/06/2024	2:07:27 PM	1,799.5000	9	AQEU
Genmab A/S	20/06/2024	2:07:27 PM	1,799.5000	9	AQEU
Genmab A/S	20/06/2024	2:07:27 PM	1,799.5000	3	XCSE
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	18	XCSE
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	147	XCSE
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	18	CEUX
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	2	AQEU
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	2	AQEU
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	2	AQEU
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	5	TQEX
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	5	TQEX
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	18	CEUX
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	18	CEUX
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	5	TQEX
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	5	TQEX
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	6	XCSE
Genmab A/S	20/06/2024	2:07:39 PM	1,798.5000	18	CEUX
Genmab A/S	20/06/2024	2:07:54 PM	1,798.5000	9	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	18	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	14	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	4	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	18	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	13	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX

82

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	19	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	19	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	21	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	37	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	19	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	18	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	10	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	18	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	18	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	1	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	16	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	1	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	7	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	10	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	1	CEUX
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	20	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	16	XCSE

83

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	11	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	16	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	9	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	11	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	43	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	20	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	43	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	4	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	10	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	2	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	1	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	1	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	14	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	6	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	2	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	5	XCSE
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:09:03 PM	1,797.0000	14	XCSE
Genmab A/S	20/06/2024	2:10:00 PM	1,796.0000	23	XCSE
Genmab A/S	20/06/2024	2:10:00 PM	1,796.0000	22	CEUX
Genmab A/S	20/06/2024	2:10:00 PM	1,796.0000	5	TQEX
Genmab A/S	20/06/2024	2:10:00 PM	1,796.0000	23	XCSE
Genmab A/S	20/06/2024	2:10:00 PM	1,796.0000	14	XCSE
Genmab A/S	20/06/2024	2:10:00 PM	1,796.0000	8	XCSE
Genmab A/S	20/06/2024	2:10:01 PM	1,796.0000	53	XCSE
Genmab A/S	20/06/2024	2:10:01 PM	1,796.0000	26	XCSE
Genmab A/S	20/06/2024	2:10:01 PM	1,796.0000	27	XCSE
Genmab A/S	20/06/2024	2:10:01 PM	1,796.0000	20	XCSE
Genmab A/S	20/06/2024	2:16:35 PM	1,798.0000	1	CEUX
Genmab A/S	20/06/2024	2:16:35 PM	1,798.0000	12	CEUX
Genmab A/S	20/06/2024	2:16:35 PM	1,798.0000	13	XCSE
Genmab A/S	20/06/2024	2:19:18 PM	1,799.5000	26	XCSE
Genmab A/S	20/06/2024	2:19:38 PM	1,799.5000	15	XCSE
Genmab A/S	20/06/2024	2:19:38 PM	1,799.5000	24	XCSE
Genmab A/S	20/06/2024	2:20:01 PM	1,799.5000	27	XCSE
Genmab A/S	20/06/2024	2:20:01 PM	1,799.5000	9	XCSE
Genmab A/S	20/06/2024	2:20:01 PM	1,799.0000	12	CEUX
Genmab A/S	20/06/2024	2:20:01 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:20:28 PM	1,799.0000	37	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	13	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	18	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	25	CEUX

84

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	13	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	5	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	22	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	20	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	36	XCSE
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	48	XCSE
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	9	XCSE
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	1	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	13	CEUX
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:22:33 PM	1,799.0000	48	XCSE
Genmab A/S	20/06/2024	2:22:45 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:22:45 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:22:45 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:22:45 PM	1,799.0000	13	CEUX
Genmab A/S	20/06/2024	2:22:45 PM	1,799.0000	13	CEUX
Genmab A/S	20/06/2024	2:22:45 PM	1,799.0000	13	XCSE
Genmab A/S	20/06/2024	2:24:22 PM	1,799.5000	30	CEUX
Genmab A/S	20/06/2024	2:24:22 PM	1,799.5000	5	CEUX
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	1	AQEU
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	13	TQEX
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	43	CEUX
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	43	CEUX
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	43	CEUX
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	1	AQEU
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	4	AQEU
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	61	TQEX
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	36	XCSE
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	47	XCSE
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	3	XCSE
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	44	XCSE
Genmab A/S	20/06/2024	2:25:13 PM	1,799.5000	6	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	43	CEUX
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	43	CEUX
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	47	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	22	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	43	CEUX
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	4	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	17	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	30	CEUX
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	6	AQEU
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	6	AQEU
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	4	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	27	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	35	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	12	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	38	XCSE

85

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	9	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	3	XCSE
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	6	AQEU
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	6	AQEU
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	6	AQEU
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	6	AQEU
Genmab A/S	20/06/2024	2:26:11 PM	1,799.5000	2	AQEU
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	43	XCSE
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	7	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	32	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	1	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	32	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	6	AQEU
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	7	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	7	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	6	AQEU
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	43	XCSE
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	32	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	32	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	7	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	43	XCSE
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	8	XCSE
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	35	XCSE
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	44	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	27	CEUX
Genmab A/S	20/06/2024	2:26:12 PM	1,799.0000	6	CEUX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	2	AQEU
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	2	AQEU
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	5	TQEX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	5	TQEX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	20	XCSE
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	5	XCSE
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	20	XCSE
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	4	XCSE
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	19	CEUX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	6	CEUX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	2	AQEU
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	3	AQEU
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	5	TQEX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	9	TQEX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	20	XCSE
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	22	XCSE
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	3	CEUX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	2	AQEU
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	2	AQEU
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	5	TQEX

86

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	7	TQEX
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	2	XCSE
Genmab A/S	20/06/2024	2:29:16 PM	1,797.5000	41	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	17	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	3	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	17	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	17	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	3	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	17	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	17	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	17	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	CEUX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	2	AQEU
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	3	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	5	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	3	TQEX
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	18	XCSE
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	4	XCSE
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	18	XCSE
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	18	XCSE
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	18	XCSE
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	18	XCSE
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	18	XCSE

87

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	7	XCSE
Genmab A/S	20/06/2024	2:29:51 PM	1,798.0000	1	XCSE
Genmab A/S	20/06/2024	2:34:03 PM	1,796.0000	21	XCSE
Genmab A/S	20/06/2024	2:34:03 PM	1,796.0000	21	XCSE
Genmab A/S	20/06/2024	2:34:03 PM	1,796.0000	21	XCSE
Genmab A/S	20/06/2024	2:34:03 PM	1,796.0000	3	XCSE
Genmab A/S	20/06/2024	2:34:03 PM	1,796.0000	21	XCSE
Genmab A/S	20/06/2024	2:34:03 PM	1,796.0000	18	XCSE
Genmab A/S	20/06/2024	2:34:32 PM	1,791.5000	21	XCSE
Genmab A/S	20/06/2024	2:34:32 PM	1,791.5000	122	XCSE
Genmab A/S	20/06/2024	2:34:32 PM	1,792.0000	21	XCSE
Genmab A/S	20/06/2024	2:34:32 PM	1,792.0000	121	XCSE
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	18	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	1	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	19	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	19	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	1	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	19	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	19	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	19	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	10	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	19	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	2	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	15	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	19	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,792.0000	1	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	2	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	7	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	20	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	2	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	20	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	14	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	6	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	10	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	20	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	9	CEUX
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	7	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU

88

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	2:34:33 PM	1,791.5000	6	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,785.5000	32	CEUX
Genmab A/S	20/06/2024	2:42:07 PM	1,785.5000	5	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,785.5000	5	TQEX
Genmab A/S	20/06/2024	2:42:07 PM	1,785.5000	28	XCSE
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	21	CEUX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	17	CEUX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	3	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	2	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	23	XCSE
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	18	XCSE
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	21	CEUX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	17	CEUX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	18	CEUX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	3	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	2	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	4	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	2	TQEX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	23	XCSE
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	18	XCSE
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	59	XCSE
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	17	CEUX
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	3	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	2	AQEU
Genmab A/S	20/06/2024	2:42:07 PM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	2:46:11 PM	1,785.5000	41	XCSE
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	4	AQEU
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	23	CEUX
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	4	AQEU
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	21	CEUX
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	25	XCSE
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	27	XCSE
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	25	XCSE
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	25	XCSE
Genmab A/S	20/06/2024	2:46:11 PM	1,785.0000	2	CEUX
Genmab A/S	20/06/2024	2:48:34 PM	1,787.5000	47	CEUX
Genmab A/S	20/06/2024	2:48:34 PM	1,787.5000	47	CEUX
Genmab A/S	20/06/2024	2:48:34 PM	1,787.5000	12	CEUX
Genmab A/S	20/06/2024	2:48:34 PM	1,787.5000	5	CEUX
Genmab A/S	20/06/2024	2:50:35 PM	1,789.0000	12	CEUX
Genmab A/S	20/06/2024	2:50:35 PM	1,789.0000	1	CEUX
Genmab A/S	20/06/2024	2:50:35 PM	1,789.0000	11	CEUX
Genmab A/S	20/06/2024	2:50:35 PM	1,789.0000	12	XCSE
Genmab A/S	20/06/2024	2:50:35 PM	1,789.0000	1	XCSE

89

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:50:35 PM	1,789.0000	12	XCSE
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	18	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	11	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	12	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	18	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	11	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	3	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	3	AQEU
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	2	AQEU
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	2	AQEU
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	20	XCSE
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	11	XCSE
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	12	XCSE
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	20	XCSE
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	11	XCSE
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	6	XCSE
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	9	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	18	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	11	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	12	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	8	CEUX
Genmab A/S	20/06/2024	2:52:16 PM	1,789.5000	10	CEUX
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	11	CEUX
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	2	AQEU
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	11	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	12	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	11	CEUX
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	2	AQEU
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	11	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	63	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	4	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	24	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	24	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	17	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	7	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	17	XCSE
Genmab A/S	20/06/2024	2:52:21 PM	1,789.5000	22	XCSE
Genmab A/S	20/06/2024	2:52:32 PM	1,789.5000	13	XCSE
Genmab A/S	20/06/2024	2:53:15 PM	1,790.5000	20	CEUX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	11	CEUX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	19	CEUX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	10	CEUX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	10	CEUX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	1	CEUX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	12	CEUX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	2	AQEU
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	3	AQEU
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	1	AQEU
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	2	AQEU

90

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	3	AQEU
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	1	AQEU
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	5	TQEX
Genmab A/S	20/06/2024	2:54:29 PM	1,791.0000	5	TQEX
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	12	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	20	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	10	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	12	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	14	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	6	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	10	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	12	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	54	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	3	XCSE
Genmab A/S	20/06/2024	2:54:30 PM	1,791.0000	34	XCSE
Genmab A/S	20/06/2024	2:54:45 PM	1,791.0000	40	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,791.0000	35	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	18	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	3	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	30	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	21	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	9	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	21	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	20	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	30	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	9	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	3	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	12	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	3	AQEU
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	3	AQEU
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	2	AQEU
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	17	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	2	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	21	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	40	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	21	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	21	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	2	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	24	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	24	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	30	XCSE

91

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	2:54:58 PM	1,790.5000	6	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	21	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	1	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	22	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	1	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	1	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	4	AQEU
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	4	AQEU
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	4	AQEU
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	21	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	24	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	3	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	19	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	23	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	3	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,790.0000	33	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	20	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	2	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	20	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	3	AQEU
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	9	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	14	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	23	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	22	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	22	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	23	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	6	CEUX
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	24	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	21	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	3	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	21	XCSE
Genmab A/S	20/06/2024	2:54:58 PM	1,789.5000	4	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	12	CEUX
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	2	AQEU
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	12	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	5	CEUX
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	7	CEUX
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	12	CEUX
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	2	AQEU
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	12	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	12	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	26	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	12	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	14	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	26	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	27	CEUX
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	26	XCSE
Genmab A/S	20/06/2024	3:00:57 PM	1,784.5000	26	XCSE
Genmab A/S	20/06/2024	3:00:58 PM	1,784.5000	26	XCSE

92

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:00:58 PM	1,784.5000	16	XCSE
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	39	XCSE
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	52	XCSE
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	36	CEUX
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	5	AQEU
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	6	TQEX
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	36	CEUX
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	50	CEUX
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	36	CEUX
Genmab A/S	20/06/2024	3:02:59 PM	1,781.5000	5	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	24	XCSE
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	21	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	21	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	4	AQEU
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	11	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	10	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	1	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	4	AQEU
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	24	XCSE
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	20	XCSE
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	21	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	11	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	3	CEUX
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	4	AQEU
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	2	AQEU
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	4	XCSE
Genmab A/S	20/06/2024	3:03:00 PM	1,781.0000	2	XCSE
Genmab A/S	20/06/2024	3:07:10 PM	1,780.5000	25	XCSE
Genmab A/S	20/06/2024	3:07:10 PM	1,780.5000	13	XCSE
Genmab A/S	20/06/2024	3:07:29 PM	1,780.5000	18	XCSE
Genmab A/S	20/06/2024	3:07:29 PM	1,780.5000	21	XCSE
Genmab A/S	20/06/2024	3:07:45 PM	1,780.5000	14	CEUX
Genmab A/S	20/06/2024	3:07:45 PM	1,780.5000	9	CEUX
Genmab A/S	20/06/2024	3:07:45 PM	1,780.5000	18	CEUX
Genmab A/S	20/06/2024	3:08:06 PM	1,780.5000	37	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	3	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	3	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	2	AQEU

93

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	4	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	6	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	7	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	4	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	14	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	30	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,780.0000	15	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	36	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	32	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	32	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	18	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	3	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	3	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	3	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	1	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	5	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	27	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	3	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	2	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	36	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	28	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	8	XCSE
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	36	CEUX
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	1	AQEU
Genmab A/S	20/06/2024	3:08:07 PM	1,779.5000	9	AQEU
Genmab A/S	20/06/2024	3:10:26 PM	1,780.0000	31	CEUX
Genmab A/S	20/06/2024	3:10:26 PM	1,780.0000	57	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	45	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	50	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	50	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	27	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	38	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	12	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	50	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	45	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	5	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	45	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	9	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	25	CEUX

94

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	37	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	20	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	44	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,783.0000	44	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	20	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	2	AQEU
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	2	AQEU
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	5	TQEX
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	21	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	20	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	2	AQEU
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	21	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	20	CEUX
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	2	AQEU
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	21	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	6	XCSE
Genmab A/S	20/06/2024	3:13:10 PM	1,782.0000	2	AQEU
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	5	TQEX
Genmab A/S	20/06/2024	3:13:10 PM	1,782.5000	43	TQEX
Genmab A/S	20/06/2024	3:14:02 PM	1,781.0000	22	CEUX
Genmab A/S	20/06/2024	3:14:02 PM	1,781.0000	22	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.5000	96	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.5000	86	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.5000	14	AQEU
Genmab A/S	20/06/2024	3:16:21 PM	1,782.5000	12	AQEU
Genmab A/S	20/06/2024	3:16:21 PM	1,782.5000	14	TQEX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.5000	106	XCSE
Genmab A/S	20/06/2024	3:16:21 PM	1,782.5000	95	XCSE
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	25	XCSE
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	25	XCSE
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	27	XCSE
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	5	XCSE
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	18	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	5	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	23	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	23	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	6	CEUX
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	4	AQEU
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	23	AQEU
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	4	AQEU
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	4	AQEU
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	7	AQEU
Genmab A/S	20/06/2024	3:16:21 PM	1,782.0000	2	AQEU
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	12	CEUX
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	2	AQEU
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	10	CEUX
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	2	CEUX
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	12	XCSE
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	12	XCSE

95

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	15	XCSE
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	12	XCSE
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	15	XCSE
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	12	CEUX
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	2	AQEU
Genmab A/S	20/06/2024	3:21:14 PM	1,781.0000	12	XCSE
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	13	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	13	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	17	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	17	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	14	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	20	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	18	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	10	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	7	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	6	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	2	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	18	XCSE
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	21	XCSE

96

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	7	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	3	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	3	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	18	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	16	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	21	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	13	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	3	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	6	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	5	TQEX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	16	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	18	XCSE
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	49	XCSE
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	3	CEUX
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	3	AQEU
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	49	XCSE
Genmab A/S	20/06/2024	3:23:39 PM	1,784.5000	18	XCSE
Genmab A/S	20/06/2024	3:23:40 PM	1,784.5000	13	XCSE
Genmab A/S	20/06/2024	3:23:40 PM	1,784.5000	6	XCSE
Genmab A/S	20/06/2024	3:23:40 PM	1,784.5000	7	XCSE
Genmab A/S	20/06/2024	3:23:40 PM	1,784.5000	4	XCSE
Genmab A/S	20/06/2024	3:23:40 PM	1,784.5000	36	XCSE
Genmab A/S	20/06/2024	3:28:45 PM	1,787.0000	1	CEUX
Genmab A/S	20/06/2024	3:28:45 PM	1,787.0000	36	CEUX
Genmab A/S	20/06/2024	3:28:45 PM	1,787.0000	30	CEUX
Genmab A/S	20/06/2024	3:28:53 PM	1,787.0000	37	XCSE
Genmab A/S	20/06/2024	3:28:53 PM	1,787.0000	1	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	23	CEUX
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	1	CEUX
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	10	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	11	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	22	CEUX
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	23	CEUX
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	1	CEUX
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	3	AQEU
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	3	AQEU
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	66	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	3	AQEU
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	14	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	7	XCSE
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	14	XCSE

97

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	3	AQEU
Genmab A/S	20/06/2024	3:29:30 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:31 PM	1,787.0000	3	AQEU
Genmab A/S	20/06/2024	3:29:31 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:29:31 PM	1,787.0000	21	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	9	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	14	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	30	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	8	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	36	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	20	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	4	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	3	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	10	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	10	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	6	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	53	CEUX
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	59	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	10	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	49	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	39	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,786.0000	50	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.5000	33	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.5000	39	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	19	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	23	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	27	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	11	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	1	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	6	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	5	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	41	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	38	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	19	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	6	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	5	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	6	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	5	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	4	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	4	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	5	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	6	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	3	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	6	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	23	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	38	XCSE

98

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	42	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	38	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	55	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	69	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	1	XCSE
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	5	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	2	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	4	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	4	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	1	AQEU
Genmab A/S	20/06/2024	3:30:01 PM	1,785.0000	5	AQEU
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	1	AQEU
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	5	AQEU
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	46	XCSE
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	94	XCSE
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	46	XCSE
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	46	XCSE
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	1	XCSE
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	45	XCSE
Genmab A/S	20/06/2024	3:31:02 PM	1,781.5000	1	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	36	XCSE
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	10	XCSE
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	2	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	12	XCSE
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	3	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	3	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	3	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	3	AQEU
Genmab A/S	20/06/2024	3:31:03 PM	1,781.5000	3	AQEU
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	6	AQEU
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	6	AQEU
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	6	AQEU
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	40	XCSE
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	29	XCSE
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	11	XCSE
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	13	XCSE
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	27	XCSE
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	12	XCSE
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	4	XCSE
Genmab A/S	20/06/2024	3:37:02 PM	1,777.5000	6	AQEU
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	25	CEUX
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	20	CEUX
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	5	CEUX
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	6	CEUX
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	26	XCSE
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	26	XCSE
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	26	XCSE

99

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	24	XCSE
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	19	CEUX
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	6	CEUX
Genmab A/S	20/06/2024	3:41:08 PM	1,780.0000	12	CEUX
Genmab A/S	20/06/2024	3:41:08 PM	1,779.5000	9	XCSE
Genmab A/S	20/06/2024	3:41:08 PM	1,779.5000	82	XCSE
Genmab A/S	20/06/2024	3:41:08 PM	1,779.5000	13	XCSE
Genmab A/S	20/06/2024	3:41:08 PM	1,779.5000	1	XCSE
Genmab A/S	20/06/2024	3:41:09 PM	1,779.5000	56	XCSE
Genmab A/S	20/06/2024	3:41:09 PM	1,779.5000	21	XCSE
Genmab A/S	20/06/2024	3:41:09 PM	1,779.5000	13	XCSE
Genmab A/S	20/06/2024	3:41:09 PM	1,779.5000	69	XCSE
Genmab A/S	20/06/2024	3:41:09 PM	1,779.5000	9	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	79	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	12	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	12	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	12	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	23	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	8	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	16	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	12	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	8	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	5	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	12	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	79	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	14	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	26	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	51	XCSE
Genmab A/S	20/06/2024	3:41:10 PM	1,779.5000	12	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	31	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	1	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	31	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	4	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	4	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	4	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	4	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	31	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	27	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	31	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	18	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	4	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	16	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	31	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	2	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	31	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	4	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	5	AQEU
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	31	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	4	XCSE

100

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	16	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	15	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	13	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	35	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.5000	10	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	23	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	65	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	52	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	46	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	50	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	6	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	94	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	50	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	139	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	13	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	46	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	37	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	46	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	10	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	46	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	4	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	46	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	4	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	46	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	4	XCSE
Genmab A/S	20/06/2024	3:43:03 PM	1,779.0000	13	XCSE
Genmab A/S	20/06/2024	3:50:30 PM	1,778.5000	9	AQEU
Genmab A/S	20/06/2024	3:50:30 PM	1,778.5000	39	XCSE
Genmab A/S	20/06/2024	3:50:30 PM	1,778.5000	39	XCSE
Genmab A/S	20/06/2024	3:50:30 PM	1,778.5000	8	XCSE
Genmab A/S	20/06/2024	3:51:11 PM	1,779.5000	31	CEUX
Genmab A/S	20/06/2024	3:51:11 PM	1,779.5000	8	CEUX
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	104	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	5	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	50	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	100	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	209	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	104	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	46	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	11	XCSE
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	13	AQEU
Genmab A/S	20/06/2024	3:51:13 PM	1,778.5000	46	AQEU
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	3	AQEU
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	20	XCSE
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	3	XCSE
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	23	XCSE

101

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:53:16 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	1	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	6	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	42	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	42	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	12	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	42	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	42	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	42	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	42	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	10	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	3	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	24	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	5	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	32	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	42	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	3	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	4	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	17	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	3	XCSE
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	2	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	4	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	4	AQEU
Genmab A/S	20/06/2024	3:54:18 PM	1,781.5000	10	XCSE
Genmab A/S	20/06/2024	3:54:58 PM	1,779.5000	40	XCSE
Genmab A/S	20/06/2024	3:54:58 PM	1,779.5000	40	XCSE
Genmab A/S	20/06/2024	3:54:59 PM	1,779.5000	33	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	45	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	49	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	49	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	45	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	81	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	13	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	99	XCSE
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	12	AQEU
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	20	AQEU
Genmab A/S	20/06/2024	3:56:28 PM	1,779.5000	5	XCSE
Genmab A/S	20/06/2024	3:56:29 PM	1,779.5000	14	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	115	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	23	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	23	XCSE

102

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	4	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	3	AQEU
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	25	AQEU
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	45	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,782.0000	16	AQEU
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	23	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	20	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	2	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	27	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	18	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	45	XCSE
Genmab A/S	20/06/2024	3:58:56 PM	1,781.5000	45	XCSE
Genmab A/S	20/06/2024	3:59:00 PM	1,781.0000	18	XCSE
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	22	AQEU
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	10	AQEU
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	12	AQEU
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	86	XCSE
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	86	XCSE
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	86	XCSE
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	37	XCSE
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	12	XCSE
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	37	XCSE
Genmab A/S	20/06/2024	4:00:50 PM	1,783.0000	8	XCSE
Genmab A/S	20/06/2024	4:02:23 PM	1,783.0000	20	AQEU
Genmab A/S	20/06/2024	4:02:31 PM	1,783.0000	167	XCSE
Genmab A/S	20/06/2024	4:02:31 PM	1,783.0000	167	XCSE
Genmab A/S	20/06/2024	4:02:31 PM	1,783.0000	1	AQEU
Genmab A/S	20/06/2024	4:02:31 PM	1,783.0000	7	XCSE
Genmab A/S	20/06/2024	4:03:31 PM	1,785.5000	8	XCSE
Genmab A/S	20/06/2024	4:03:31 PM	1,785.5000	315	XCSE
Genmab A/S	20/06/2024	4:03:31 PM	1,785.5000	16	AQEU
Genmab A/S	20/06/2024	4:03:31 PM	1,785.5000	25	AQEU
Genmab A/S	20/06/2024	4:06:29 PM	1,785.5000	20	XCSE
Genmab A/S	20/06/2024	4:06:30 PM	1,785.5000	20	XCSE
Genmab A/S	20/06/2024	4:06:31 PM	1,785.5000	20	XCSE
Genmab A/S	20/06/2024	4:06:32 PM	1,785.5000	20	XCSE
Genmab A/S	20/06/2024	4:07:26 PM	1,788.5000	3	CEUX
Genmab A/S	20/06/2024	4:07:26 PM	1,788.5000	49	CEUX
Genmab A/S	20/06/2024	4:07:26 PM	1,788.5000	49	CEUX
Genmab A/S	20/06/2024	4:07:26 PM	1,788.5000	16	CEUX
Genmab A/S	20/06/2024	4:07:32 PM	1,788.5000	33	CEUX
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	57	XCSE
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	50	XCSE
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	59	XCSE
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	50	XCSE
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	109	XCSE
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	57	XCSE
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	21	AQEU
Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	118	XCSE

103

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:07:32 PM	1,788.0000	42	XCSE
Genmab A/S	20/06/2024	4:08:03 PM	1,786.5000	11	AQEU
Genmab A/S	20/06/2024	4:08:03 PM	1,786.5000	4	TQEX
Genmab A/S	20/06/2024	4:08:03 PM	1,786.5000	7	TQEX
Genmab A/S	20/06/2024	4:08:03 PM	1,786.5000	81	XCSE
Genmab A/S	20/06/2024	4:09:57 PM	1,787.5000	50	XCSE
Genmab A/S	20/06/2024	4:09:57 PM	1,787.5000	10	XCSE
Genmab A/S	20/06/2024	4:09:57 PM	1,787.5000	50	XCSE
Genmab A/S	20/06/2024	4:09:57 PM	1,787.5000	50	XCSE
Genmab A/S	20/06/2024	4:09:57 PM	1,787.5000	146	XCSE
Genmab A/S	20/06/2024	4:09:57 PM	1,788.0000	36	XCSE
Genmab A/S	20/06/2024	4:09:57 PM	1,787.5000	38	AQEU
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	45	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	45	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	45	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	2	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	43	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	14	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	7	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	10	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	14	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	31	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	45	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	14	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	31	XCSE
Genmab A/S	20/06/2024	4:10:00 PM	1,787.0000	8	XCSE
Genmab A/S	20/06/2024	4:10:01 PM	1,787.0000	40	XCSE
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	1	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	18	XCSE
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	119	XCSE
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	18	XCSE
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	11	XCSE
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	3	AQEU
Genmab A/S	20/06/2024	4:12:35 PM	1,787.5000	13	XCSE
Genmab A/S	20/06/2024	4:13:43 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:43 PM	1,789.0000	7	XCSE
Genmab A/S	20/06/2024	4:13:43 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:43 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE

104

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	38	XCSE
Genmab A/S	20/06/2024	4:13:44 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:45 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:45 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:45 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:45 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:45 PM	1,789.0000	23	XCSE
Genmab A/S	20/06/2024	4:13:45 PM	1,789.0000	39	XCSE
Genmab A/S	20/06/2024	4:13:46 PM	1,788.0000	40	XCSE
Genmab A/S	20/06/2024	4:13:46 PM	1,788.0000	25	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	12	AQEU
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	13	AQEU
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	16	AQEU
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	14	AQEU
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	194	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	5	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	5	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	5	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	5	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	5	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	89	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	2	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	13	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	80	XCSE
Genmab A/S	20/06/2024	4:16:37 PM	1,789.5000	40	XCSE
Genmab A/S	20/06/2024	4:17:27 PM	1,790.5000	9	AQEU
Genmab A/S	20/06/2024	4:17:27 PM	1,790.5000	1	AQEU
Genmab A/S	20/06/2024	4:17:27 PM	1,790.5000	39	XCSE
Genmab A/S	20/06/2024	4:17:27 PM	1,790.5000	30	XCSE
Genmab A/S	20/06/2024	4:17:27 PM	1,790.5000	49	XCSE
Genmab A/S	20/06/2024	4:17:27 PM	1,790.5000	9	XCSE
Genmab A/S	20/06/2024	4:17:27 PM	1,790.5000	12	XCSE
Genmab A/S	20/06/2024	4:17:28 PM	1,790.5000	1	XCSE
Genmab A/S	20/06/2024	4:18:59 PM	1,790.5000	22	XCSE
Genmab A/S	20/06/2024	4:18:59 PM	1,790.5000	37	XCSE
Genmab A/S	20/06/2024	4:19:00 PM	1,790.5000	22	XCSE
Genmab A/S	20/06/2024	4:19:00 PM	1,790.5000	22	XCSE
Genmab A/S	20/06/2024	4:19:01 PM	1,790.5000	22	XCSE
Genmab A/S	20/06/2024	4:19:16 PM	1,790.5000	22	XCSE
Genmab A/S	20/06/2024	4:19:16 PM	1,790.5000	16	XCSE
Genmab A/S	20/06/2024	4:19:20 PM	1,790.5000	19	XCSE
Genmab A/S	20/06/2024	4:19:20 PM	1,790.5000	3	XCSE
Genmab A/S	20/06/2024	4:19:20 PM	1,790.5000	34	XCSE

105

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:19:20 PM	1,790.5000	22	XCSE
Genmab A/S	20/06/2024	4:19:20 PM	1,790.5000	12	XCSE
Genmab A/S	20/06/2024	4:19:20 PM	1,790.5000	10	XCSE
Genmab A/S	20/06/2024	4:19:20 PM	1,790.5000	3	AQEU
Genmab A/S	20/06/2024	4:19:21 PM	1,790.5000	18	XCSE
Genmab A/S	20/06/2024	4:19:35 PM	1,789.0000	21	XCSE
Genmab A/S	20/06/2024	4:19:35 PM	1,789.0000	21	XCSE
Genmab A/S	20/06/2024	4:19:35 PM	1,789.0000	37	XCSE
Genmab A/S	20/06/2024	4:21:51 PM	1,790.5000	5	XCSE
Genmab A/S	20/06/2024	4:21:54 PM	1,790.5000	28	XCSE
Genmab A/S	20/06/2024	4:21:54 PM	1,790.5000	6	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,790.5000	35	CEUX
Genmab A/S	20/06/2024	4:22:04 PM	1,790.0000	34	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,790.0000	184	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,790.0000	161	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,790.0000	28	AQEU
Genmab A/S	20/06/2024	4:22:04 PM	1,790.0000	21	AQEU
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	17	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	33	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	17	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	30	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	17	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	33	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	27	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	20	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	50	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	8	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	20	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	19	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	31	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	19	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	15	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	6	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	14	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	12	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	20	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	12	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	18	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	47	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	14	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	7	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	29	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	7	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.5000	50	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.0000	42	XCSE
Genmab A/S	20/06/2024	4:22:04 PM	1,789.0000	10	XCSE
Genmab A/S	20/06/2024	4:22:06 PM	1,789.0000	41	XCSE
Genmab A/S	20/06/2024	4:26:04 PM	1,789.5000	69	XCSE
Genmab A/S	20/06/2024	4:26:04 PM	1,789.5000	69	XCSE

106

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:26:04 PM	1,789.5000	25	XCSE
Genmab A/S	20/06/2024	4:26:05 PM	1,789.5000	44	XCSE
Genmab A/S	20/06/2024	4:26:05 PM	1,789.0000	13	XCSE
Genmab A/S	20/06/2024	4:26:07 PM	1,788.5000	7	XCSE
Genmab A/S	20/06/2024	4:28:34 PM	1,790.5000	9	CEUX
Genmab A/S	20/06/2024	4:28:34 PM	1,790.5000	13	CEUX
Genmab A/S	20/06/2024	4:28:38 PM	1,790.5000	14	CEUX
Genmab A/S	20/06/2024	4:28:49 PM	1,789.5000	5	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.5000	133	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.5000	143	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.5000	297	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.5000	35	AQEU
Genmab A/S	20/06/2024	4:29:41 PM	1,789.0000	46	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.0000	42	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.0000	2	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.0000	20	XCSE
Genmab A/S	20/06/2024	4:29:41 PM	1,789.0000	2	TQEX
Genmab A/S	20/06/2024	4:30:44 PM	1,790.0000	10	XCSE
Genmab A/S	20/06/2024	4:30:50 PM	1,790.0000	10	XCSE
Genmab A/S	20/06/2024	4:30:55 PM	1,790.0000	170	XCSE
Genmab A/S	20/06/2024	4:32:39 PM	1,791.5000	3	AQEU
Genmab A/S	20/06/2024	4:32:39 PM	1,791.5000	7	AQEU
Genmab A/S	20/06/2024	4:32:39 PM	1,791.5000	20	XCSE
Genmab A/S	20/06/2024	4:32:39 PM	1,791.5000	13	XCSE
Genmab A/S	20/06/2024	4:32:39 PM	1,791.5000	7	XCSE
Genmab A/S	20/06/2024	4:32:39 PM	1,791.5000	126	XCSE
Genmab A/S	20/06/2024	4:32:39 PM	1,791.5000	20	XCSE
Genmab A/S	20/06/2024	4:32:40 PM	1,791.5000	20	XCSE
Genmab A/S	20/06/2024	4:32:41 PM	1,791.5000	18	XCSE
Genmab A/S	20/06/2024	4:32:42 PM	1,791.5000	2	XCSE
Genmab A/S	20/06/2024	4:33:33 PM	1,792.0000	11	XCSE
Genmab A/S	20/06/2024	4:33:33 PM	1,792.0000	9	XCSE
Genmab A/S	20/06/2024	4:33:33 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	4:33:33 PM	1,792.0000	1	XCSE
Genmab A/S	20/06/2024	4:33:33 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	4:33:33 PM	1,792.0000	10	XCSE
Genmab A/S	20/06/2024	4:33:33 PM	1,792.0000	10	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	10	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	10	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	20	XCSE
Genmab A/S	20/06/2024	4:33:34 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	4:33:35 PM	1,792.0000	18	XCSE

107

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:33:35 PM	1,792.0000	2	XCSE
Genmab A/S	20/06/2024	4:33:35 PM	1,792.0000	3	AQEU
Genmab A/S	20/06/2024	4:33:35 PM	1,792.0000	10	XCSE
Genmab A/S	20/06/2024	4:33:35 PM	1,792.0000	10	XCSE
Genmab A/S	20/06/2024	4:33:35 PM	1,792.0000	5	XCSE
Genmab A/S	20/06/2024	4:34:17 PM	1,792.0000	140	XCSE
Genmab A/S	20/06/2024	4:34:17 PM	1,792.0000	19	TQEX
Genmab A/S	20/06/2024	4:34:17 PM	1,792.0000	18	TQEX
Genmab A/S	20/06/2024	4:36:06 PM	1,794.0000	9	TQEX
Genmab A/S	20/06/2024	4:36:14 PM	1,793.0000	18	XCSE
Genmab A/S	20/06/2024	4:36:14 PM	1,793.0000	26	XCSE
Genmab A/S	20/06/2024	4:38:08 PM	1,794.0000	38	XCSE
Genmab A/S	20/06/2024	4:38:08 PM	1,794.0000	25	XCSE
Genmab A/S	20/06/2024	4:38:08 PM	1,794.0000	38	XCSE
Genmab A/S	20/06/2024	4:38:08 PM	1,794.0000	25	XCSE
Genmab A/S	20/06/2024	4:38:21 PM	1,794.0000	38	XCSE
Genmab A/S	20/06/2024	4:38:21 PM	1,794.0000	25	XCSE
Genmab A/S	20/06/2024	4:38:21 PM	1,794.0000	23	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	38	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	25	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	23	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	38	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	25	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	23	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	38	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	25	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	23	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	15	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	23	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	34	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	4	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	35	XCSE
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	5	AQEU
Genmab A/S	20/06/2024	4:38:22 PM	1,794.0000	1	AQEU
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	221	XCSE
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	3	XCSE
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	22	XCSE
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	202	XCSE
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	12	XCSE
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	202	XCSE
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	40	XCSE

108

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	184	XCSE
Genmab A/S	20/06/2024	4:38:30 PM	1,793.5000	44	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	40	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	33	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	12	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	40	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	12	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	33	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	19	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	21	XCSE
Genmab A/S	20/06/2024	4:40:17 PM	1,795.0000	45	XCSE
Genmab A/S	20/06/2024	4:40:19 PM	1,795.0000	40	XCSE
Genmab A/S	20/06/2024	4:40:19 PM	1,795.0000	45	XCSE
Genmab A/S	20/06/2024	4:40:19 PM	1,795.0000	9	XCSE
Genmab A/S	20/06/2024	4:40:19 PM	1,795.0000	45	XCSE
Genmab A/S	20/06/2024	4:40:19 PM	1,795.0000	44	XCSE
Genmab A/S	20/06/2024	4:40:19 PM	1,795.0000	1	XCSE
Genmab A/S	20/06/2024	4:40:19 PM	1,795.0000	44	XCSE
Genmab A/S	20/06/2024	4:42:53 PM	1,791.0000	22	XCSE
Genmab A/S	20/06/2024	4:42:53 PM	1,791.0000	68	XCSE
Genmab A/S	20/06/2024	4:43:15 PM	1,791.5000	21	XCSE
Genmab A/S	20/06/2024	4:44:04 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:44:04 PM	1,791.5000	10	XCSE
Genmab A/S	20/06/2024	4:44:05 PM	1,791.5000	15	XCSE
Genmab A/S	20/06/2024	4:44:06 PM	1,791.5000	24	XCSE
Genmab A/S	20/06/2024	4:44:06 PM	1,791.5000	1	XCSE
Genmab A/S	20/06/2024	4:44:06 PM	1,791.5000	13	XCSE
Genmab A/S	20/06/2024	4:44:34 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:44:35 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:44:36 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:44:36 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:44:36 PM	1,791.5000	13	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	63	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	1	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	8	AQEU
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	8	AQEU
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	8	AQEU
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	26	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	8	AQEU
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	4	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	34	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	64	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	64	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	30	XCSE

109

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	8	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	8	AQEU
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	4	AQEU
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	51	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	8	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	39	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	25	XCSE
Genmab A/S	20/06/2024	4:45:02 PM	1,791.5000	16	XCSE
Genmab A/S	20/06/2024	4:45:03 PM	1,791.5000	18	XCSE
Genmab A/S	20/06/2024	4:45:03 PM	1,791.5000	7	XCSE
Genmab A/S	20/06/2024	4:45:04 PM	1,791.5000	20	XCSE
Genmab A/S	20/06/2024	4:45:04 PM	1,791.5000	5	XCSE
Genmab A/S	20/06/2024	4:45:05 PM	1,791.5000	20	XCSE
Genmab A/S	20/06/2024	4:45:05 PM	1,791.5000	5	XCSE
Genmab A/S	20/06/2024	4:45:52 PM	1,790.5000	12	XCSE
Genmab A/S	20/06/2024	4:46:02 PM	1,790.5000	21	XCSE
Genmab A/S	20/06/2024	4:46:04 PM	1,790.5000	4	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	50	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	27	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	50	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	27	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	77	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	77	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	77	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	64	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	13	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	26	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	23	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	7	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	21	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	77	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	2	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	59	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	16	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	4	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	26	XCSE
Genmab A/S	20/06/2024	4:46:18 PM	1,792.5000	33	XCSE
Genmab A/S	20/06/2024	4:46:19 PM	1,792.5000	3	XCSE
Genmab A/S	20/06/2024	4:46:19 PM	1,792.5000	15	XCSE
Genmab A/S	20/06/2024	4:46:19 PM	1,792.5000	26	XCSE
Genmab A/S	20/06/2024	4:46:19 PM	1,792.5000	51	XCSE
Genmab A/S	20/06/2024	4:46:19 PM	1,792.5000	59	XCSE
Genmab A/S	20/06/2024	4:46:20 PM	1,791.5000	50	XCSE
Genmab A/S	20/06/2024	4:46:20 PM	1,791.5000	50	XCSE
Genmab A/S	20/06/2024	4:46:20 PM	1,791.5000	50	XCSE
Genmab A/S	20/06/2024	4:46:21 PM	1,791.5000	50	XCSE
Genmab A/S	20/06/2024	4:46:21 PM	1,791.5000	50	XCSE

110

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:48:19 PM	1,792.0000	73	XCSE
Genmab A/S	20/06/2024	4:48:19 PM	1,792.0000	50	XCSE
Genmab A/S	20/06/2024	4:48:19 PM	1,792.0000	24	XCSE
Genmab A/S	20/06/2024	4:48:19 PM	1,792.0000	21	XCSE
Genmab A/S	20/06/2024	4:48:19 PM	1,792.0000	24	XCSE
Genmab A/S	20/06/2024	4:48:19 PM	1,792.0000	47	XCSE
Genmab A/S	20/06/2024	4:49:36 PM	1,794.0000	22	XCSE
Genmab A/S	20/06/2024	4:49:36 PM	1,794.0000	22	XCSE
Genmab A/S	20/06/2024	4:49:37 PM	1,794.0000	22	XCSE
Genmab A/S	20/06/2024	4:49:38 PM	1,794.0000	22	XCSE
Genmab A/S	20/06/2024	4:50:10 PM	1,794.0000	22	XCSE
Genmab A/S	20/06/2024	4:50:10 PM	1,794.0000	22	XCSE
Genmab A/S	20/06/2024	4:50:45 PM	1,794.0000	8	TQEX
Genmab A/S	20/06/2024	4:50:45 PM	1,794.0000	29	TQEX
Genmab A/S	20/06/2024	4:50:51 PM	1,794.0000	34	TQEX
Genmab A/S	20/06/2024	4:50:55 PM	1,794.0000	13	TQEX
Genmab A/S	20/06/2024	4:50:55 PM	1,794.0000	27	TQEX
Genmab A/S	20/06/2024	4:50:59 PM	1,794.0000	26	XCSE
Genmab A/S	20/06/2024	4:50:59 PM	1,794.0000	13	XCSE
Genmab A/S	20/06/2024	4:51:14 PM	1,794.5000	31	XCSE
Genmab A/S	20/06/2024	4:51:14 PM	1,794.5000	11	XCSE
Genmab A/S	20/06/2024	4:51:14 PM	1,794.5000	60	XCSE
Genmab A/S	20/06/2024	4:51:26 PM	1,795.0000	50	XCSE
Genmab A/S	20/06/2024	4:51:26 PM	1,795.0000	19	XCSE
Genmab A/S	20/06/2024	4:51:26 PM	1,795.0000	8	XCSE
Genmab A/S	20/06/2024	4:51:27 PM	1,795.0000	91	XCSE
Genmab A/S	20/06/2024	4:51:31 PM	1,795.0000	48	XCSE
Genmab A/S	20/06/2024	4:51:31 PM	1,795.0000	105	XCSE
Genmab A/S	20/06/2024	4:51:31 PM	1,795.0000	15	XCSE
Genmab A/S	20/06/2024	4:51:31 PM	1,795.0000	15	XCSE
Genmab A/S	20/06/2024	4:51:39 PM	1,794.5000	88	XCSE
Genmab A/S	20/06/2024	4:51:39 PM	1,794.5000	46	XCSE
Genmab A/S	20/06/2024	4:51:39 PM	1,794.5000	134	XCSE
Genmab A/S	20/06/2024	4:51:39 PM	1,794.5000	6	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	134	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	23	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	25	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	134	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	23	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	134	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	22	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	17	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.5000	61	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.0000	21	XCSE
Genmab A/S	20/06/2024	4:52:15 PM	1,794.0000	38	XCSE
Genmab A/S	20/06/2024	4:52:16 PM	1,793.5000	47	AQEU
Genmab A/S	20/06/2024	4:52:16 PM	1,793.5000	18	AQEU
Genmab A/S	20/06/2024	4:52:51 PM	1,794.0000	21	TQEX
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU

111

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	25	AQEU
Genmab A/S	20/06/2024	4:54:21 PM	1,796.5000	12	AQEU
Genmab A/S	20/06/2024	4:54:28 PM	1,795.5000	9	XCSE
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	18	CEUX
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	2	AQEU
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	3	AQEU
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	5	TQEX
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	18	CEUX
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	18	XCSE
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	18	CEUX
Genmab A/S	21/06/2024	9:00:22 AM	1,799.5000	18	XCSE
Genmab A/S	21/06/2024	9:00:47 AM	1,798.5000	17	CEUX
Genmab A/S	21/06/2024	9:00:47 AM	1,798.5000	5	CEUX
Genmab A/S	21/06/2024	9:00:47 AM	1,798.5000	15	CEUX
Genmab A/S	21/06/2024	9:00:47 AM	1,798.5000	17	CEUX
Genmab A/S	21/06/2024	9:02:13 AM	1,800.0000	3	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	21	CEUX
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	15	CEUX
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	19	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	4	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	19	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	19	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	22	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	39	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	23	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	15	XCSE
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	5	TQEX
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	5	TQEX
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	5	TQEX
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	5	TQEX
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	5	TQEX
Genmab A/S	21/06/2024	9:02:15 AM	1,800.0000	5	TQEX
Genmab A/S	21/06/2024	9:02:17 AM	1,800.0000	7	CEUX
Genmab A/S	21/06/2024	9:02:17 AM	1,800.0000	19	CEUX
Genmab A/S	21/06/2024	9:06:37 AM	1,807.5000	3	XCSE
Genmab A/S	21/06/2024	9:07:33 AM	1,809.5000	25	XCSE
Genmab A/S	21/06/2024	9:07:33 AM	1,809.5000	9	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	4	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	7	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	24	CEUX

112

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	35	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	7	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	35	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	6	TQEX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	6	TQEX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	39	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	35	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	39	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	6	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	21	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	15	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	3	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	15	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	18	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	18	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	2	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	35	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	6	TQEX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	35	CEUX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	6	TQEX
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	12	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	7	XCSE
Genmab A/S	21/06/2024	9:07:39 AM	1,809.5000	6	TQEX
Genmab A/S	21/06/2024	9:07:41 AM	1,809.5000	30	XCSE
Genmab A/S	21/06/2024	9:07:41 AM	1,809.5000	9	XCSE
Genmab A/S	21/06/2024	9:07:41 AM	1,809.5000	7	XCSE
Genmab A/S	21/06/2024	9:07:41 AM	1,809.5000	7	XCSE
Genmab A/S	21/06/2024	9:07:41 AM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	9:07:41 AM	1,809.5000	5	XCSE
Genmab A/S	21/06/2024	9:08:12 AM	1,810.0000	5	TQEX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	14	CEUX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	27	CEUX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	27	CEUX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	14	CEUX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	4	CEUX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	2	AQEU
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	TQEX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	3	TQEX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	3	TQEX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	3	TQEX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	6	TQEX
Genmab A/S	21/06/2024	9:08:20 AM	1,810.0000	10	CEUX

113

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:08:51 AM	1,809.5000	19	XCSE
Genmab A/S	21/06/2024	9:08:51 AM	1,809.5000	28	XCSE
Genmab A/S	21/06/2024	9:08:51 AM	1,809.5000	43	CEUX
Genmab A/S	21/06/2024	9:08:51 AM	1,809.5000	7	TQEX
Genmab A/S	21/06/2024	9:09:15 AM	1,809.0000	10	XCSE
Genmab A/S	21/06/2024	9:09:15 AM	1,809.0000	10	XCSE
Genmab A/S	21/06/2024	9:09:15 AM	1,809.0000	20	XCSE
Genmab A/S	21/06/2024	9:09:15 AM	1,809.0000	11	CEUX
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	22	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	50	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	50	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	55	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	22	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	3	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	5	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	17	XCSE
Genmab A/S	21/06/2024	9:10:08 AM	1,809.5000	22	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,809.5000	17	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	9	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	8	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	5	TQEX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	9	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	9	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	9	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	9	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	5	TQEX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	5	TQEX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	9	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	5	TQEX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	1	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	8	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	17	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	23	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	23	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	20	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	19	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	16	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	2	AQEU
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	2	AQEU
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	3	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	20	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	23	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.5000	5	XCSE
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	5	TQEX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	5	TQEX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	4	CEUX
Genmab A/S	21/06/2024	9:10:09 AM	1,808.0000	19	CEUX
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	14	CEUX
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	11	CEUX

114

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	17	CEUX
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	82	CEUX
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	25	CEUX
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	3	CEUX
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	25	CEUX
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	65	XCSE
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	45	XCSE
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	5	XCSE
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	21	XCSE
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	50	XCSE
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	29	XCSE
Genmab A/S	21/06/2024	9:12:34 AM	1,808.5000	17	CEUX
Genmab A/S	21/06/2024	9:18:50 AM	1,814.0000	24	XCSE
Genmab A/S	21/06/2024	9:18:50 AM	1,814.0000	1	XCSE
Genmab A/S	21/06/2024	9:18:50 AM	1,814.0000	24	CEUX
Genmab A/S	21/06/2024	9:18:50 AM	1,814.0000	22	CEUX
Genmab A/S	21/06/2024	9:18:50 AM	1,814.0000	3	AQEU
Genmab A/S	21/06/2024	9:18:50 AM	1,814.0000	10	CEUX
Genmab A/S	21/06/2024	9:18:50 AM	1,814.0000	5	TQEX
Genmab A/S	21/06/2024	9:18:57 AM	1,814.0000	11	CEUX
Genmab A/S	21/06/2024	9:18:59 AM	1,814.0000	8	XCSE
Genmab A/S	21/06/2024	9:19:56 AM	1,813.5000	13	CEUX
Genmab A/S	21/06/2024	9:19:56 AM	1,813.5000	5	TQEX
Genmab A/S	21/06/2024	9:19:56 AM	1,813.5000	11	XCSE
Genmab A/S	21/06/2024	9:20:22 AM	1,813.0000	4	CEUX
Genmab A/S	21/06/2024	9:20:37 AM	1,814.5000	10	CEUX
Genmab A/S	21/06/2024	9:20:37 AM	1,814.5000	12	AQEU
Genmab A/S	21/06/2024	9:20:37 AM	1,814.5000	10	TQEX
Genmab A/S	21/06/2024	9:20:37 AM	1,814.5000	10	XCSE
Genmab A/S	21/06/2024	9:23:33 AM	1,816.5000	20	XCSE
Genmab A/S	21/06/2024	9:23:33 AM	1,816.5000	55	XCSE
Genmab A/S	21/06/2024	9:23:33 AM	1,816.5000	79	XCSE
Genmab A/S	21/06/2024	9:24:11 AM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	19	XCSE
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	19	CEUX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	13	CEUX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	12	CEUX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	7	CEUX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	19	XCSE
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	19	CEUX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	5	CEUX
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	19	XCSE
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	43	XCSE
Genmab A/S	21/06/2024	9:24:14 AM	1,817.0000	14	XCSE
Genmab A/S	21/06/2024	9:24:14 AM	1,816.5000	8	XCSE
Genmab A/S	21/06/2024	9:24:21 AM	1,817.0000	38	CEUX
Genmab A/S	21/06/2024	9:24:35 AM	1,817.0000	36	CEUX

115

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:24:40 AM	1,817.0000	10	CEUX
Genmab A/S	21/06/2024	9:24:40 AM	1,817.0000	21	CEUX
Genmab A/S	21/06/2024	9:24:40 AM	1,817.0000	7	TQEX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	50	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	6	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	44	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	38	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	44	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	6	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	15	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	6	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	44	CEUX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	18	CEUX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	26	CEUX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	44	CEUX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	26	CEUX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	18	CEUX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	7	AQEU
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	2	AQEU
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	7	TQEX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	7	TQEX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	7	TQEX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	7	TQEX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	44	CEUX
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	15	XCSE
Genmab A/S	21/06/2024	9:24:49 AM	1,816.0000	15	CEUX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	29	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	41	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	41	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	25	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	25	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	40	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	29	CEUX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	7	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	7	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	30	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	21	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	8	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	3	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	39	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	12	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	39	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	8	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	13	XCSE
Genmab A/S	21/06/2024	9:24:50 AM	1,816.0000	9	XCSE

116

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:29:36 AM	1,814.5000	42	CEUX
Genmab A/S	21/06/2024	9:29:36 AM	1,814.5000	14	CEUX
Genmab A/S	21/06/2024	9:29:36 AM	1,814.5000	10	CEUX
Genmab A/S	21/06/2024	9:29:36 AM	1,814.5000	7	TQEX
Genmab A/S	21/06/2024	9:29:36 AM	1,814.5000	46	XCSE
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	11	CEUX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	11	CEUX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	11	CEUX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	11	CEUX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	9	CEUX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	2	CEUX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	5	TQEX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	10	XCSE
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	10	XCSE
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	20	XCSE
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	11	CEUX
Genmab A/S	21/06/2024	9:30:44 AM	1,818.0000	5	TQEX
Genmab A/S	21/06/2024	9:30:45 AM	1,818.0000	11	CEUX
Genmab A/S	21/06/2024	9:30:45 AM	1,818.0000	10	XCSE
Genmab A/S	21/06/2024	9:30:45 AM	1,818.0000	10	XCSE
Genmab A/S	21/06/2024	9:30:45 AM	1,818.0000	10	XCSE
Genmab A/S	21/06/2024	9:30:45 AM	1,818.0000	10	XCSE
Genmab A/S	21/06/2024	9:30:45 AM	1,818.0000	19	XCSE
Genmab A/S	21/06/2024	9:30:45 AM	1,818.0000	8	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	4	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	4	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	9	CEUX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	9	CEUX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	7	CEUX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	1	AQEU
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	9	AQEU
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	1	AQEU
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	9	CEUX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	9	TQEX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	9	TQEX
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	8	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	41	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	8	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	6	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	8	XCSE
Genmab A/S	21/06/2024	9:31:10 AM	1,817.0000	55	XCSE
Genmab A/S	21/06/2024	9:33:17 AM	1,817.0000	16	TQEX
Genmab A/S	21/06/2024	9:33:17 AM	1,817.0000	11	XCSE
Genmab A/S	21/06/2024	9:33:17 AM	1,817.0000	9	XCSE
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	49	CEUX
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	7	AQEU
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	4	AQEU

117

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	7	AQEU
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	7	AQEU
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	8	TQEX
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	4	TQEX
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	55	XCSE
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	49	CEUX
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	7	AQEU
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	4	AQEU
Genmab A/S	21/06/2024	9:33:17 AM	1,815.5000	8	TQEX
Genmab A/S	21/06/2024	9:33:27 AM	1,815.5000	55	XCSE
Genmab A/S	21/06/2024	9:33:27 AM	1,815.5000	49	CEUX
Genmab A/S	21/06/2024	9:33:27 AM	1,815.5000	3	CEUX
Genmab A/S	21/06/2024	9:33:27 AM	1,815.5000	2	AQEU
Genmab A/S	21/06/2024	9:33:27 AM	1,815.5000	1	CEUX
Genmab A/S	21/06/2024	9:33:27 AM	1,815.5000	55	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	45	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	49	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	34	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	5	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	8	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	8	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	8	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	55	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	55	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	34	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	21	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	9	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	12	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	9	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU

118

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	36	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	1	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	5	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	1	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.5000	3	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	36	CEUX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	8	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	8	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	49	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	10	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	14	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	3	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	8	AQEU
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	8	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	2	TQEX
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	39	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	39	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	13	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	4	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	22	XCSE
Genmab A/S	21/06/2024	9:33:28 AM	1,815.0000	16	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	44	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	25	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	22	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	39	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	3	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	39	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	3	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	AQEU

119

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	2	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	8	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	8	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,812.0000	6	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	17	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	2	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	19	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	17	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	2	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	19	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	17	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	17	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	21	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	17	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	21	XCSE
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	12	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	2	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	2	AQEU
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	9	CEUX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:37:59 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	17	CEUX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	21	CEUX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	2	AQEU
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	2	AQEU
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	17	XCSE
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	21	XCSE
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	3	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	17	CEUX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	15	CEUX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	2	TQEX
Genmab A/S	21/06/2024	9:38:00 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	9:38:01 AM	1,811.5000	6	CEUX
Genmab A/S	21/06/2024	9:38:01 AM	1,811.5000	13	CEUX

120

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:38:01 AM	1,811.5000	17	XCSE
Genmab A/S	21/06/2024	9:38:01 AM	1,811.5000	20	XCSE
Genmab A/S	21/06/2024	9:38:01 AM	1,811.5000	13	XCSE
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	18	XCSE
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	2	XCSE
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	18	CEUX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	18	CEUX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	15	CEUX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	18	CEUX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	15	CEUX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	3	CEUX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	2	AQEU
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	2	AQEU
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	9:44:39 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	9:46:22 AM	1,814.0000	19	XCSE
Genmab A/S	21/06/2024	9:46:22 AM	1,814.0000	20	XCSE
Genmab A/S	21/06/2024	9:46:35 AM	1,814.0000	13	XCSE
Genmab A/S	21/06/2024	9:46:35 AM	1,814.0000	26	XCSE
Genmab A/S	21/06/2024	9:46:49 AM	1,814.0000	13	XCSE
Genmab A/S	21/06/2024	9:46:49 AM	1,814.0000	23	XCSE
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	20	XCSE
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	23	XCSE
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	23	XCSE
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	10	XCSE
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	39	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	39	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	11	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	11	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	16	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	11	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	1	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	10	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	AQEU
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	20	AQEU
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	AQEU
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	12	AQEU
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	12	CEUX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	9:48:15 AM	1,813.0000	4	TQEX
Genmab A/S	21/06/2024	9:48:16 AM	1,813.0000	7	XCSE

121

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:48:16 AM	1,813.0000	3	XCSE
Genmab A/S	21/06/2024	9:48:16 AM	1,813.0000	33	XCSE
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	3	AQEU
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	2	AQEU
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	9:48:16 AM	1,813.0000	36	CEUX
Genmab A/S	21/06/2024	9:48:16 AM	1,813.0000	10	CEUX
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	12	XCSE
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	10	XCSE
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	21	XCSE
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	9:48:16 AM	1,812.5000	21	XCSE
Genmab A/S	21/06/2024	9:51:20 AM	1,817.0000	11	XCSE
Genmab A/S	21/06/2024	9:51:54 AM	1,818.0000	14	XCSE
Genmab A/S	21/06/2024	9:51:54 AM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	9:51:55 AM	1,818.0000	14	XCSE
Genmab A/S	21/06/2024	9:51:55 AM	1,818.0000	11	XCSE
Genmab A/S	21/06/2024	9:52:43 AM	1,819.0000	51	XCSE
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	25	XCSE
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	26	XCSE
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	103	XCSE
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	38	XCSE
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	51	XCSE
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	52	XCSE
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	46	CEUX
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	72	CEUX
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	7	TQEX
Genmab A/S	21/06/2024	9:52:49 AM	1,819.0000	16	TQEX
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	19	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	51	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	21	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	24	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	47	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	19	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	12	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	5	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	45	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	46	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	1	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	19	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	16	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	5	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	18	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	5	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	1	XCSE
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	34	CEUX

122

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	18	CEUX
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	9	CEUX
Genmab A/S	21/06/2024	9:56:25 AM	1,820.0000	5	TQEX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	XCSE
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	7	XCSE
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	1	XCSE
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	1	XCSE
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	5	TQEX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	9	TQEX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	5	TQEX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	4	TQEX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	5	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	3	CEUX
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	8	XCSE
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	1	XCSE
Genmab A/S	21/06/2024	10:02:37 AM	1,822.0000	4	CEUX
Genmab A/S	21/06/2024	10:03:10 AM	1,822.0000	5	CEUX
Genmab A/S	21/06/2024	10:03:10 AM	1,822.0000	3	CEUX
Genmab A/S	21/06/2024	10:03:10 AM	1,822.0000	10	CEUX
Genmab A/S	21/06/2024	10:03:10 AM	1,822.0000	1	AQEU
Genmab A/S	21/06/2024	10:03:10 AM	1,822.0000	1	AQEU
Genmab A/S	21/06/2024	10:03:10 AM	1,822.0000	5	TQEX
Genmab A/S	21/06/2024	10:03:10 AM	1,822.0000	5	TQEX
Genmab A/S	21/06/2024	10:04:18 AM	1,823.5000	46	XCSE
Genmab A/S	21/06/2024	10:04:18 AM	1,823.5000	13	XCSE
Genmab A/S	21/06/2024	10:04:19 AM	1,823.0000	8	AQEU
Genmab A/S	21/06/2024	10:04:24 AM	1,823.5000	34	XCSE
Genmab A/S	21/06/2024	10:04:28 AM	1,823.5000	34	CEUX
Genmab A/S	21/06/2024	10:04:37 AM	1,823.5000	7	CEUX
Genmab A/S	21/06/2024	10:04:37 AM	1,823.5000	21	CEUX
Genmab A/S	21/06/2024	10:04:37 AM	1,823.5000	9	CEUX
Genmab A/S	21/06/2024	10:04:56 AM	1,823.5000	2	CEUX
Genmab A/S	21/06/2024	10:04:56 AM	1,823.5000	13	CEUX
Genmab A/S	21/06/2024	10:04:56 AM	1,823.5000	20	XCSE
Genmab A/S	21/06/2024	10:05:09 AM	1,823.0000	53	CEUX
Genmab A/S	21/06/2024	10:05:09 AM	1,823.0000	59	XCSE
Genmab A/S	21/06/2024	10:05:09 AM	1,823.0000	13	XCSE
Genmab A/S	21/06/2024	10:05:09 AM	1,823.0000	9	XCSE
Genmab A/S	21/06/2024	10:05:09 AM	1,823.0000	1	XCSE
Genmab A/S	21/06/2024	10:05:09 AM	1,823.0000	53	CEUX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	9	XCSE
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	39	XCSE

123

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	9	XCSE
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	9	CEUX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	9	CEUX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	9	CEUX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	9	CEUX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	2	CEUX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	5	TQEX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	9	CEUX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	5	TQEX
Genmab A/S	21/06/2024	10:05:34 AM	1,822.5000	5	XCSE
Genmab A/S	21/06/2024	10:05:48 AM	1,822.0000	6	CEUX
Genmab A/S	21/06/2024	10:05:48 AM	1,822.0000	2	CEUX
Genmab A/S	21/06/2024	10:05:48 AM	1,822.0000	8	XCSE
Genmab A/S	21/06/2024	10:07:27 AM	1,822.0000	1	AQEU
Genmab A/S	21/06/2024	10:07:27 AM	1,822.0000	8	CEUX
Genmab A/S	21/06/2024	10:07:27 AM	1,822.0000	8	XCSE
Genmab A/S	21/06/2024	10:07:27 AM	1,822.0000	5	TQEX
Genmab A/S	21/06/2024	10:07:36 AM	1,822.5000	23	AQEU
Genmab A/S	21/06/2024	10:07:36 AM	1,822.5000	4	AQEU
Genmab A/S	21/06/2024	10:07:36 AM	1,822.5000	10	AQEU
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	71	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	25	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	23	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	39	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	32	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	39	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	71	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	16	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	10	AQEU
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	7	AQEU
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	33	AQEU
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	5	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	11	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	7	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	11	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	7	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	9	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	2	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	52	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	26	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	52	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	169	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,823.5000	50	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	21	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	42	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	21	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	42	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	21	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	27	XCSE

124

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	30	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	21	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	21	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	1	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	1	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	19	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	19	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	2	AQEU
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	9	AQEU
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	20	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	20	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	20	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	20	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	2	AQEU
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	5	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	5	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	1	TQEX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	4	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	2	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	2	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	1	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	18	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	18	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	1	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	2	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	2	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	3	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	16	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	2	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	3	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	15	CEUX
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	30	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	55	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	48	XCSE
Genmab A/S	21/06/2024	10:08:47 AM	1,822.5000	13	XCSE
Genmab A/S	21/06/2024	10:15:23 AM	1,814.0000	18	XCSE
Genmab A/S	21/06/2024	10:15:23 AM	1,814.0000	127	XCSE
Genmab A/S	21/06/2024	10:16:27 AM	1,813.0000	1	CEUX
Genmab A/S	21/06/2024	10:16:27 AM	1,813.0000	16	CEUX
Genmab A/S	21/06/2024	10:16:27 AM	1,813.0000	5	CEUX
Genmab A/S	21/06/2024	10:16:27 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	10:16:27 AM	1,813.0000	18	XCSE
Genmab A/S	21/06/2024	10:16:27 AM	1,813.0000	5	CEUX
Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	41	CEUX
Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	45	XCSE
Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	45	XCSE
Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	7	CEUX
Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	1	CEUX
Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	2	CEUX

125

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	45	XCSE
Genmab A/S	21/06/2024	10:17:55 AM	1,813.0000	38	XCSE
Genmab A/S	21/06/2024	10:20:22 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:20:22 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:20:22 AM	1,811.0000	5	CEUX
Genmab A/S	21/06/2024	10:21:02 AM	1,812.0000	36	CEUX
Genmab A/S	21/06/2024	10:21:02 AM	1,812.0000	2	AQEU
Genmab A/S	21/06/2024	10:21:02 AM	1,812.0000	2	AQEU
Genmab A/S	21/06/2024	10:23:33 AM	1,813.5000	12	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,813.5000	55	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,813.5000	25	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	44	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	44	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	3	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	14	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	2	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	4	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	4	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	2	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	AQEU
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	7	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	2	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	TQEX

126

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	6	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	31	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	3	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	5	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	35	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	2	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	1	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	1	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	4	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	1	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	7	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	1	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	1	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	7	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	2	XCSE
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	3	TQEX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	6	CEUX
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	8	AQEU
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	2	AQEU
Genmab A/S	21/06/2024	10:23:33 AM	1,812.5000	25	CEUX
Genmab A/S	21/06/2024	10:27:00 AM	1,816.0000	3	CEUX
Genmab A/S	21/06/2024	10:27:01 AM	1,816.0000	47	CEUX
Genmab A/S	21/06/2024	10:27:01 AM	1,816.0000	26	CEUX
Genmab A/S	21/06/2024	10:27:01 AM	1,816.0000	16	CEUX
Genmab A/S	21/06/2024	10:27:02 AM	1,816.0000	8	CEUX
Genmab A/S	21/06/2024	10:27:22 AM	1,816.0000	14	CEUX
Genmab A/S	21/06/2024	10:27:22 AM	1,816.0000	31	CEUX
Genmab A/S	21/06/2024	10:27:22 AM	1,816.0000	31	CEUX
Genmab A/S	21/06/2024	10:27:22 AM	1,816.0000	14	CEUX
Genmab A/S	21/06/2024	10:27:22 AM	1,816.0000	15	CEUX
Genmab A/S	21/06/2024	10:27:30 AM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	10:27:46 AM	1,816.0000	8	CEUX
Genmab A/S	21/06/2024	10:27:46 AM	1,816.0000	11	CEUX
Genmab A/S	21/06/2024	10:27:56 AM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	10:27:56 AM	1,816.0000	2	XCSE
Genmab A/S	21/06/2024	10:28:18 AM	1,815.0000	11	XCSE
Genmab A/S	21/06/2024	10:29:15 AM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	10:29:15 AM	1,816.0000	14	CEUX
Genmab A/S	21/06/2024	10:29:15 AM	1,816.0000	6	CEUX

127

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:29:15 AM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	10:29:15 AM	1,816.0000	7	CEUX
Genmab A/S	21/06/2024	10:29:16 AM	1,816.0000	15	CEUX
Genmab A/S	21/06/2024	10:29:16 AM	1,816.0000	13	CEUX
Genmab A/S	21/06/2024	10:29:22 AM	1,816.0000	9	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	45	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	33	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	45	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	5	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	55	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	45	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	41	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	41	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	9	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	41	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	6	AQEU
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	38	AQEU
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	7	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	7	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	4	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	41	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	11	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	7	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	30	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	10	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	8	AQEU
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	7	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	1	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	5	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	9	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	9	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	41	CEUX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	8	AQEU
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	6	AQEU
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	7	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	39	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,815.5000	7	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,814.5000	5	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,814.5000	2	TQEX
Genmab A/S	21/06/2024	10:29:32 AM	1,814.5000	7	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,814.5000	1	XCSE
Genmab A/S	21/06/2024	10:29:32 AM	1,814.5000	3	TQEX
Genmab A/S	21/06/2024	10:29:58 AM	1,813.5000	2	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	7	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	32	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX

128

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	20	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	20	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	3	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	6	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	4	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	3	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	7	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	4	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	14	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	7	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	6	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	3	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	XCSE

129

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	8	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	3	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	4	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	9	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	8	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	10	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	25	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	25	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	4	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	21	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	1	XCSE
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	AQEU
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	8	TQEX
Genmab A/S	21/06/2024	10:33:12 AM	1,816.0000	2	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	10	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	66	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	1	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	5	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	11	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	11	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	19	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	8	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.5000	106	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	20	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	21	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	20	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	21	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	6	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	20	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	6	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	15	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	10	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	1	CEUX

130

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	14	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	4	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	1	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	1	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	22	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	21	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	22	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	21	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	1	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	1	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	1	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	21	XCSE
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	36	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	7	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	9	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	9	AQEU
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	10	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	36	CEUX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	8	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	18	XCSE

131

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	3	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	8	TQEX
Genmab A/S	21/06/2024	10:36:45 AM	1,813.0000	1	TQEX
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	19	CEUX
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	19	XCSE
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	5	TQEX
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	13	CEUX
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	1	XCSE
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	6	CEUX
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	5	CEUX
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	2	AQEU
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	5	TQEX
Genmab A/S	21/06/2024	10:38:14 AM	1,809.0000	18	XCSE
Genmab A/S	21/06/2024	10:38:15 AM	1,809.0000	6	CEUX
Genmab A/S	21/06/2024	10:38:15 AM	1,809.0000	19	XCSE
Genmab A/S	21/06/2024	10:41:48 AM	1,807.5000	23	XCSE
Genmab A/S	21/06/2024	10:42:02 AM	1,805.5000	14	CEUX
Genmab A/S	21/06/2024	10:42:02 AM	1,805.5000	6	CEUX
Genmab A/S	21/06/2024	10:43:13 AM	1,806.5000	3	AQEU
Genmab A/S	21/06/2024	10:43:13 AM	1,806.5000	1	AQEU
Genmab A/S	21/06/2024	10:44:13 AM	1,806.5000	11	CEUX
Genmab A/S	21/06/2024	10:44:13 AM	1,806.5000	13	CEUX
Genmab A/S	21/06/2024	10:44:13 AM	1,806.5000	1	AQEU
Genmab A/S	21/06/2024	10:44:13 AM	1,806.5000	5	TQEX
Genmab A/S	21/06/2024	10:44:13 AM	1,806.5000	24	XCSE
Genmab A/S	21/06/2024	10:44:13 AM	1,806.5000	24	XCSE
Genmab A/S	21/06/2024	10:44:13 AM	1,806.5000	11	CEUX
Genmab A/S	21/06/2024	10:44:47 AM	1,806.5000	31	XCSE
Genmab A/S	21/06/2024	10:45:45 AM	1,807.0000	17	CEUX
Genmab A/S	21/06/2024	10:45:45 AM	1,807.0000	19	CEUX
Genmab A/S	21/06/2024	10:45:46 AM	1,806.5000	19	CEUX
Genmab A/S	21/06/2024	10:45:46 AM	1,806.5000	3	CEUX
Genmab A/S	21/06/2024	10:46:18 AM	1,807.5000	35	CEUX
Genmab A/S	21/06/2024	10:47:50 AM	1,809.5000	18	CEUX
Genmab A/S	21/06/2024	10:47:50 AM	1,809.5000	26	CEUX
Genmab A/S	21/06/2024	10:47:50 AM	1,809.5000	15	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX

132

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	5	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	5	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	5	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	30	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	2	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	5	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	5	TQEX

133

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	23	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	31	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	23	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	35	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	23	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	23	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	39	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	4	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	20	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE

134

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	2	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,810.5000	14	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,810.5000	30	XCSE
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	19	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	6	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	9	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	3	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	3	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	18	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	3	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	CEUX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	3	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	2	TQEX
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	7	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	2	AQEU
Genmab A/S	21/06/2024	10:49:19 AM	1,811.0000	4	AQEU
Genmab A/S	21/06/2024	10:53:41 AM	1,808.5000	50	XCSE
Genmab A/S	21/06/2024	10:53:41 AM	1,808.5000	50	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	8	CEUX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	8	CEUX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	30	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	XCSE

135

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	6	AQEU
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	33	AQEU
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	8	CEUX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	2	AQEU
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	CEUX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	8	CEUX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	37	XCSE
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	22	CEUX
Genmab A/S	21/06/2024	10:57:14 AM	1,812.5000	3	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	37	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	24	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	6	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	5	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	1	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	41	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	25	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	20	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	6	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,813.0000	3	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	43	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	7	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	22	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	63	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	22	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	33	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	5	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	13	XCSE
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	14	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	22	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	5	TQEX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	14	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	7	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	1	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	2	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	21	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	18	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	3	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	3	AQEU
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	5	TQEX

136

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	5	TQEX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	8	CEUX
Genmab A/S	21/06/2024	10:59:36 AM	1,812.0000	3	AQEU
Genmab A/S	21/06/2024	11:05:07 AM	1,810.5000	35	CEUX
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	10	CEUX
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	5	TQEX
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	10	XCSE
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	10	CEUX
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	10	CEUX
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	10	CEUX
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	5	TQEX
Genmab A/S	21/06/2024	11:05:07 AM	1,810.0000	10	XCSE
Genmab A/S	21/06/2024	11:05:55 AM	1,812.0000	39	CEUX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	20	CEUX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	3	AQEU
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	3	AQEU
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	3	AQEU
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	3	AQEU
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	3	TQEX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	2	TQEX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	51	XCSE
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	51	XCSE
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	20	CEUX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	15	CEUX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	2	AQEU
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	8	AQEU
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	3	TQEX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	11:08:23 AM	1,812.5000	3	TQEX
Genmab A/S	21/06/2024	11:08:24 AM	1,813.0000	10	CEUX
Genmab A/S	21/06/2024	11:08:24 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	11:08:24 AM	1,813.0000	9	XCSE
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	10	CEUX
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	5	CEUX
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	1	AQEU
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	5	AQEU
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	9	XCSE
Genmab A/S	21/06/2024	11:08:25 AM	1,813.0000	7	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	45	CEUX
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	7	TQEX
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	48	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	51	XCSE

137

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	45	CEUX
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	48	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	51	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	15	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	51	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	51	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	2	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	45	CEUX
Genmab A/S	21/06/2024	11:09:15 AM	1,812.5000	67	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	39	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	30	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	25	XCSE
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	34	CEUX
Genmab A/S	21/06/2024	11:09:15 AM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	11:12:07 AM	1,811.5000	17	CEUX
Genmab A/S	21/06/2024	11:12:15 AM	1,811.5000	17	CEUX
Genmab A/S	21/06/2024	11:12:15 AM	1,811.5000	3	CEUX
Genmab A/S	21/06/2024	11:12:15 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	11:12:15 AM	1,811.5000	18	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	37	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	5	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	5	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	37	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	23	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	14	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	23	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	14	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	TQEX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	TQEX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	23	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	3	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	37	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	10	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	36	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	42	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	10	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	37	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	14	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	2	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	TQEX

138

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	6	TQEX
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	13	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	8	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	9	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	9	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	9	TQEX
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	10	TQEX
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	23	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	23	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	22	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,811.0000	1	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	5	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	16	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	5	CEUX
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	3	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	5	AQEU
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	5	TQEX
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	50	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	2	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	11	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	18	XCSE
Genmab A/S	21/06/2024	11:12:58 AM	1,810.5000	11	XCSE
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	42	XCSE
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	6	XCSE
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	8	XCSE
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	37	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	14	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	6	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	19	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	6	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	6	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	6	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	1	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	6	TQEX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	6	TQEX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	16	TQEX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	18	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	1	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	4	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	17	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	19	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	4	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	2	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	3	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	5	TQEX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	5	TQEX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	9	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.5000	9	TQEX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	19	XCSE

139

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	23	XCSE
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	21	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	17	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	2	CEUX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	2	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	3	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	3	AQEU
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	5	TQEX
Genmab A/S	21/06/2024	11:16:52 AM	1,808.0000	5	TQEX
Genmab A/S	21/06/2024	11:23:01 AM	1,810.0000	10	CEUX
Genmab A/S	21/06/2024	11:23:01 AM	1,810.0000	5	TQEX
Genmab A/S	21/06/2024	11:23:01 AM	1,810.0000	5	TQEX
Genmab A/S	21/06/2024	11:23:01 AM	1,810.0000	9	XCSE
Genmab A/S	21/06/2024	11:23:01 AM	1,810.0000	9	XCSE
Genmab A/S	21/06/2024	11:23:01 AM	1,810.0000	10	CEUX
Genmab A/S	21/06/2024	11:23:01 AM	1,810.0000	5	TQEX
Genmab A/S	21/06/2024	11:23:02 AM	1,810.0000	9	XCSE
Genmab A/S	21/06/2024	11:23:02 AM	1,810.0000	10	CEUX
Genmab A/S	21/06/2024	11:23:02 AM	1,810.0000	1	AQEU
Genmab A/S	21/06/2024	11:23:02 AM	1,810.0000	5	TQEX
Genmab A/S	21/06/2024	11:23:02 AM	1,810.0000	3	XCSE
Genmab A/S	21/06/2024	11:23:57 AM	1,811.0000	18	CEUX
Genmab A/S	21/06/2024	11:23:57 AM	1,811.0000	3	CEUX
Genmab A/S	21/06/2024	11:23:57 AM	1,811.0000	12	CEUX
Genmab A/S	21/06/2024	11:23:57 AM	1,811.0000	5	CEUX
Genmab A/S	21/06/2024	11:25:52 AM	1,813.0000	12	XCSE
Genmab A/S	21/06/2024	11:25:52 AM	1,813.0000	9	XCSE
Genmab A/S	21/06/2024	11:25:52 AM	1,813.0000	9	XCSE
Genmab A/S	21/06/2024	11:25:52 AM	1,813.0000	9	XCSE
Genmab A/S	21/06/2024	11:25:52 AM	1,813.0000	22	XCSE
Genmab A/S	21/06/2024	11:25:59 AM	1,813.0000	19	CEUX
Genmab A/S	21/06/2024	11:25:59 AM	1,813.0000	46	CEUX
Genmab A/S	21/06/2024	11:25:59 AM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	11:25:59 AM	1,813.0000	5	AQEU
Genmab A/S	21/06/2024	11:25:59 AM	1,813.0000	11	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	4	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	82	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	82	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	4	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	86	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	86	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	4	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	28	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	49	CEUX
Genmab A/S	21/06/2024	11:27:16 AM	1,814.5000	5	CEUX
Genmab A/S	21/06/2024	11:29:35 AM	1,817.5000	30	XCSE
Genmab A/S	21/06/2024	11:29:35 AM	1,817.5000	9	XCSE
Genmab A/S	21/06/2024	11:29:44 AM	1,817.5000	30	XCSE
Genmab A/S	21/06/2024	11:29:44 AM	1,817.5000	7	XCSE

140

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	2	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	6	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	1	AQEU
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	5	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	1	AQEU
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	9	AQEU
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	1	AQEU
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	1	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	CEUX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:00 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE

141

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	1	AQEU
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	2	TQEX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	3	TQEX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	1	AQEU
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	3	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	14	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,818.5000	53	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.5000	15	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.5000	38	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.5000	5	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.5000	49	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	13	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	23	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	20	CEUX
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	2	TQEX
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	3	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	15	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	3	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	15	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	18	XCSE
Genmab A/S	21/06/2024	11:30:01 AM	1,818.0000	2	CEUX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	18	CEUX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	4	CEUX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	4	CEUX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	3	TQEX

142

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	3	TQEX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	2	TQEX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	1	TQEX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	12	CEUX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	48	TQEX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	5	TQEX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	16	TQEX
Genmab A/S	21/06/2024	11:30:02 AM	1,818.0000	11	TQEX
Genmab A/S	21/06/2024	11:34:34 AM	1,813.5000	105	XCSE
Genmab A/S	21/06/2024	11:34:34 AM	1,813.5000	25	CEUX
Genmab A/S	21/06/2024	11:34:34 AM	1,813.5000	50	CEUX
Genmab A/S	21/06/2024	11:34:34 AM	1,813.5000	19	CEUX
Genmab A/S	21/06/2024	11:34:34 AM	1,813.5000	14	AQEU
Genmab A/S	21/06/2024	11:34:34 AM	1,813.5000	14	TQEX
Genmab A/S	21/06/2024	11:34:35 AM	1,813.0000	19	CEUX
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	8	AQEU
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	53	CEUX
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	8	TQEX
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	8	TQEX
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	26	XCSE
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	32	XCSE
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	36	XCSE
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	33	CEUX
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	8	AQEU
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	8	AQEU
Genmab A/S	21/06/2024	11:36:13 AM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	22	CEUX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	23	XCSE
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	23	XCSE
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	22	CEUX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	22	CEUX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	3	AQEU
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	5	TQEX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	23	XCSE
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	21	CEUX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	3	AQEU
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	5	TQEX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	5	TQEX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.5000	36	CEUX
Genmab A/S	21/06/2024	11:39:42 AM	1,813.0000	18	XCSE
Genmab A/S	21/06/2024	11:43:34 AM	1,814.0000	10	CEUX
Genmab A/S	21/06/2024	11:43:34 AM	1,814.0000	10	CEUX
Genmab A/S	21/06/2024	11:43:34 AM	1,814.0000	17	CEUX
Genmab A/S	21/06/2024	11:43:34 AM	1,814.0000	2	AQEU
Genmab A/S	21/06/2024	11:43:54 AM	1,814.0000	8	AQEU
Genmab A/S	21/06/2024	11:43:54 AM	1,814.0000	12	XCSE
Genmab A/S	21/06/2024	11:43:54 AM	1,814.0000	15	XCSE
Genmab A/S	21/06/2024	11:44:16 AM	1,814.0000	17	XCSE

143

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	33	CEUX
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	5	TQEX
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	1	XCSE
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	19	XCSE
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	37	XCSE
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	61	XCSE
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	33	CEUX
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	5	AQEU
Genmab A/S	21/06/2024	11:44:17 AM	1,814.0000	5	TQEX
Genmab A/S	21/06/2024	11:44:18 AM	1,814.0000	80	XCSE
Genmab A/S	21/06/2024	11:44:18 AM	1,814.0000	19	XCSE
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	36	CEUX
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	8	CEUX
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	42	CEUX
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	7	AQEU
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	7	AQEU
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	6	AQEU
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	6	TQEX
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	6	TQEX
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	3	TQEX
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	24	XCSE
Genmab A/S	21/06/2024	11:45:47 AM	1,812.5000	24	XCSE
Genmab A/S	21/06/2024	11:46:59 AM	1,814.5000	38	CEUX
Genmab A/S	21/06/2024	11:46:59 AM	1,814.5000	123	XCSE
Genmab A/S	21/06/2024	11:46:59 AM	1,814.5000	17	TQEX
Genmab A/S	21/06/2024	11:46:59 AM	1,814.5000	50	CEUX
Genmab A/S	21/06/2024	11:46:59 AM	1,814.5000	22	CEUX
Genmab A/S	21/06/2024	11:46:59 AM	1,814.5000	16	AQEU
Genmab A/S	21/06/2024	11:46:59 AM	1,814.0000	21	XCSE
Genmab A/S	21/06/2024	11:49:48 AM	1,813.5000	57	XCSE
Genmab A/S	21/06/2024	11:49:48 AM	1,813.5000	52	CEUX
Genmab A/S	21/06/2024	11:49:48 AM	1,813.5000	8	TQEX
Genmab A/S	21/06/2024	11:50:03 AM	1,813.0000	101	CEUX
Genmab A/S	21/06/2024	11:50:03 AM	1,813.0000	5	CEUX
Genmab A/S	21/06/2024	11:50:03 AM	1,813.0000	15	AQEU
Genmab A/S	21/06/2024	11:50:03 AM	1,813.0000	17	TQEX
Genmab A/S	21/06/2024	11:50:03 AM	1,813.0000	100	XCSE
Genmab A/S	21/06/2024	11:50:03 AM	1,813.0000	19	XCSE
Genmab A/S	21/06/2024	11:51:11 AM	1,812.0000	2	XCSE
Genmab A/S	21/06/2024	11:51:52 AM	1,812.5000	2	XCSE
Genmab A/S	21/06/2024	11:51:52 AM	1,812.5000	18	XCSE
Genmab A/S	21/06/2024	11:51:52 AM	1,812.5000	16	XCSE
Genmab A/S	21/06/2024	11:51:52 AM	1,812.5000	4	XCSE
Genmab A/S	21/06/2024	11:51:52 AM	1,812.5000	19	CEUX
Genmab A/S	21/06/2024	11:51:52 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	11:52:45 AM	1,813.0000	8	XCSE
Genmab A/S	21/06/2024	11:52:45 AM	1,813.0000	36	XCSE
Genmab A/S	21/06/2024	11:52:45 AM	1,813.0000	40	CEUX
Genmab A/S	21/06/2024	11:52:45 AM	1,813.0000	6	TQEX

144

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:53:00 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	11:53:00 AM	1,812.5000	17	CEUX
Genmab A/S	21/06/2024	11:53:00 AM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	11:53:07 AM	1,812.5000	10	XCSE
Genmab A/S	21/06/2024	11:53:07 AM	1,812.5000	18	XCSE
Genmab A/S	21/06/2024	11:53:45 AM	1,812.5000	58	CEUX
Genmab A/S	21/06/2024	11:53:45 AM	1,812.5000	9	AQEU
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	8	XCSE
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	39	XCSE
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	9	XCSE
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	14	XCSE
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	50	CEUX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	50	CEUX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	8	TQEX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	8	TQEX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	14	TQEX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	16	CEUX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	9	CEUX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	8	TQEX
Genmab A/S	21/06/2024	11:54:00 AM	1,813.0000	1	XCSE
Genmab A/S	21/06/2024	11:54:02 AM	1,813.0000	74	XCSE
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	41	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	41	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	9	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	16	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	21	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	1	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	5	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	1	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	5	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	1	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	4	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	7	TQEX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	7	TQEX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	7	TQEX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	7	TQEX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	5	TQEX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	4	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	46	XCSE
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	6	XCSE
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	4	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	20	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	26	CEUX
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	2	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	4	AQEU
Genmab A/S	21/06/2024	11:55:22 AM	1,811.5000	3	TQEX
Genmab A/S	21/06/2024	11:57:05 AM	1,812.5000	1	AQEU

145

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:57:23 AM	1,812.5000	4	TQEX
Genmab A/S	21/06/2024	11:57:30 AM	1,812.5000	14	XCSE
Genmab A/S	21/06/2024	11:57:30 AM	1,812.5000	9	XCSE
Genmab A/S	21/06/2024	11:57:30 AM	1,812.5000	17	XCSE
Genmab A/S	21/06/2024	11:57:30 AM	1,812.5000	21	CEUX
Genmab A/S	21/06/2024	11:57:30 AM	1,812.5000	1	XCSE
Genmab A/S	21/06/2024	11:57:45 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	11:58:00 AM	1,812.5000	8	XCSE
Genmab A/S	21/06/2024	11:58:00 AM	1,812.5000	15	CEUX
Genmab A/S	21/06/2024	11:58:00 AM	1,812.5000	6	CEUX
Genmab A/S	21/06/2024	11:58:00 AM	1,812.5000	5	CEUX
Genmab A/S	21/06/2024	11:58:00 AM	1,812.5000	7	CEUX
Genmab A/S	21/06/2024	11:58:00 AM	1,812.5000	4	CEUX
Genmab A/S	21/06/2024	11:58:00 AM	1,812.5000	5	CEUX
Genmab A/S	21/06/2024	11:58:00 AM	1,812.0000	2	CEUX
Genmab A/S	21/06/2024	11:58:00 AM	1,812.0000	2	AQEU
Genmab A/S	21/06/2024	11:58:15 AM	1,812.0000	8	XCSE
Genmab A/S	21/06/2024	11:58:15 AM	1,812.0000	1	XCSE
Genmab A/S	21/06/2024	11:58:29 AM	1,812.0000	8	XCSE
Genmab A/S	21/06/2024	11:58:30 AM	1,812.0000	1	XCSE
Genmab A/S	21/06/2024	11:58:44 AM	1,812.0000	8	XCSE
Genmab A/S	21/06/2024	11:58:51 AM	1,812.0000	2	XCSE
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	16	CEUX
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	2	AQEU
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	7	AQEU
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	44	CEUX
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	12	CEUX
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	5	TQEX
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	7	TQEX
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	8	XCSE
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	50	XCSE
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	2	XCSE
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	2	CEUX
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	4	CEUX
Genmab A/S	21/06/2024	11:58:58 AM	1,812.0000	11	CEUX
Genmab A/S	21/06/2024	11:58:59 AM	1,812.0000	8	XCSE
Genmab A/S	21/06/2024	11:59:00 AM	1,812.5000	12	XCSE
Genmab A/S	21/06/2024	11:59:00 AM	1,812.5000	13	XCSE
Genmab A/S	21/06/2024	11:59:07 AM	1,812.5000	9	XCSE
Genmab A/S	21/06/2024	11:59:07 AM	1,812.5000	11	XCSE
Genmab A/S	21/06/2024	11:59:11 AM	1,812.5000	10	XCSE
Genmab A/S	21/06/2024	11:59:11 AM	1,812.5000	11	XCSE
Genmab A/S	21/06/2024	11:59:11 AM	1,812.5000	7	XCSE
Genmab A/S	21/06/2024	11:59:13 AM	1,812.0000	15	CEUX
Genmab A/S	21/06/2024	11:59:13 AM	1,812.0000	20	TQEX
Genmab A/S	21/06/2024	11:59:13 AM	1,812.0000	7	AQEU
Genmab A/S	21/06/2024	11:59:13 AM	1,812.0000	7	TQEX
Genmab A/S	21/06/2024	11:59:14 AM	1,812.0000	8	XCSE
Genmab A/S	21/06/2024	11:59:21 AM	1,812.0000	21	CEUX

146

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	11:59:21 AM	1,812.0000	14	CEUX
Genmab A/S	21/06/2024	11:59:21 AM	1,812.0000	1	AQEU
Genmab A/S	21/06/2024	11:59:29 AM	1,811.5000	8	XCSE
Genmab A/S	21/06/2024	11:59:30 AM	1,811.5000	1	XCSE
Genmab A/S	21/06/2024	11:59:30 AM	1,811.5000	5	XCSE
Genmab A/S	21/06/2024	11:59:39 AM	1,812.0000	8	CEUX
Genmab A/S	21/06/2024	11:59:39 AM	1,812.0000	14	CEUX
Genmab A/S	21/06/2024	11:59:39 AM	1,812.0000	2	XCSE
Genmab A/S	21/06/2024	11:59:44 AM	1,812.0000	8	XCSE
Genmab A/S	21/06/2024	11:59:45 AM	1,812.0000	30	CEUX
Genmab A/S	21/06/2024	11:59:45 AM	1,812.0000	5	TQEX
Genmab A/S	21/06/2024	11:59:45 AM	1,812.0000	23	XCSE
Genmab A/S	21/06/2024	12:00:05 PM	1,812.5000	5	CEUX
Genmab A/S	21/06/2024	12:00:05 PM	1,812.5000	23	CEUX
Genmab A/S	21/06/2024	12:00:24 PM	1,813.0000	19	CEUX
Genmab A/S	21/06/2024	12:00:53 PM	1,813.0000	19	CEUX
Genmab A/S	21/06/2024	12:00:53 PM	1,813.0000	17	CEUX
Genmab A/S	21/06/2024	12:00:58 PM	1,813.0000	19	CEUX
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	8	CEUX
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	8	CEUX
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	9	AQEU
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	3	TQEX
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	7	XCSE
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	1	XCSE
Genmab A/S	21/06/2024	12:01:02 PM	1,813.0000	22	XCSE
Genmab A/S	21/06/2024	12:01:05 PM	1,813.0000	19	XCSE
Genmab A/S	21/06/2024	12:01:05 PM	1,813.0000	3	XCSE
Genmab A/S	21/06/2024	12:01:05 PM	1,813.0000	22	XCSE
Genmab A/S	21/06/2024	12:01:05 PM	1,813.0000	22	XCSE
Genmab A/S	21/06/2024	12:01:10 PM	1,813.0000	38	XCSE
Genmab A/S	21/06/2024	12:01:22 PM	1,813.0000	36	TQEX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	9	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	20	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	6	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	16	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	5	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	3	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	56	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	5	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	8	AQEU
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	1	AQEU
Genmab A/S	21/06/2024	12:01:28 PM	1,812.5000	9	TQEX
Genmab A/S	21/06/2024	12:01:28 PM	1,813.0000	18	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,813.0000	8	CEUX
Genmab A/S	21/06/2024	12:01:28 PM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	12:01:28 PM	1,813.0000	5	AQEU

147

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	12:01:28 PM	1,813.0000	8	TQEX
Genmab A/S	21/06/2024	12:01:28 PM	1,813.0000	10	XCSE
Genmab A/S	21/06/2024	12:01:28 PM	1,813.0000	18	XCSE
Genmab A/S	21/06/2024	12:02:03 PM	1,812.5000	56	CEUX
Genmab A/S	21/06/2024	12:02:03 PM	1,812.5000	9	TQEX
Genmab A/S	21/06/2024	12:02:03 PM	1,812.5000	51	XCSE
Genmab A/S	21/06/2024	12:03:05 PM	1,813.0000	19	AQEU
Genmab A/S	21/06/2024	12:03:20 PM	1,813.0000	19	AQEU
Genmab A/S	21/06/2024	12:03:23 PM	1,813.0000	19	AQEU
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	19	CEUX
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	11	CEUX
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	5	TQEX
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	19	XCSE
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	8	XCSE
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	11	XCSE
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	6	XCSE
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	11	XCSE
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	8	XCSE
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	8	CEUX
Genmab A/S	21/06/2024	12:05:49 PM	1,814.0000	9	CEUX
Genmab A/S	21/06/2024	12:05:55 PM	1,814.5000	9	XCSE
Genmab A/S	21/06/2024	12:05:55 PM	1,814.5000	25	XCSE
Genmab A/S	21/06/2024	12:05:56 PM	1,814.5000	7	CEUX
Genmab A/S	21/06/2024	12:05:56 PM	1,814.5000	18	CEUX
Genmab A/S	21/06/2024	12:05:56 PM	1,814.5000	15	CEUX
Genmab A/S	21/06/2024	12:05:56 PM	1,814.5000	9	CEUX
Genmab A/S	21/06/2024	12:05:56 PM	1,814.5000	12	XCSE
Genmab A/S	21/06/2024	12:05:56 PM	1,814.5000	12	XCSE
Genmab A/S	21/06/2024	12:05:56 PM	1,814.5000	9	CEUX
Genmab A/S	21/06/2024	12:05:57 PM	1,814.5000	28	CEUX
Genmab A/S	21/06/2024	12:07:00 PM	1,814.5000	21	CEUX
Genmab A/S	21/06/2024	12:07:33 PM	1,814.5000	17	CEUX
Genmab A/S	21/06/2024	12:07:33 PM	1,814.5000	2	AQEU
Genmab A/S	21/06/2024	12:07:33 PM	1,814.5000	2	AQEU
Genmab A/S	21/06/2024	12:07:33 PM	1,814.5000	5	TQEX
Genmab A/S	21/06/2024	12:07:33 PM	1,814.5000	18	XCSE
Genmab A/S	21/06/2024	12:08:02 PM	1,814.5000	19	XCSE
Genmab A/S	21/06/2024	12:08:02 PM	1,814.5000	25	XCSE
Genmab A/S	21/06/2024	12:08:02 PM	1,814.5000	25	CEUX
Genmab A/S	21/06/2024	12:08:02 PM	1,814.5000	20	TQEX
Genmab A/S	21/06/2024	12:08:02 PM	1,814.5000	3	TQEX
Genmab A/S	21/06/2024	12:08:06 PM	1,814.5000	19	XCSE
Genmab A/S	21/06/2024	12:09:02 PM	1,814.5000	13	CEUX
Genmab A/S	21/06/2024	12:09:02 PM	1,814.5000	6	AQEU
Genmab A/S	21/06/2024	12:09:02 PM	1,814.5000	14	CEUX
Genmab A/S	21/06/2024	12:09:03 PM	1,814.5000	18	CEUX
Genmab A/S	21/06/2024	12:09:03 PM	1,814.5000	17	CEUX
Genmab A/S	21/06/2024	12:09:37 PM	1,814.5000	19	XCSE
Genmab A/S	21/06/2024	12:09:37 PM	1,814.5000	29	XCSE

148

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	12:09:42 PM	1,814.5000	39	XCSE
Genmab A/S	21/06/2024	12:09:42 PM	1,814.5000	9	XCSE
Genmab A/S	21/06/2024	12:09:42 PM	1,814.5000	9	XCSE
Genmab A/S	21/06/2024	12:09:42 PM	1,814.5000	39	XCSE
Genmab A/S	21/06/2024	12:09:42 PM	1,814.5000	8	XCSE
Genmab A/S	21/06/2024	12:09:43 PM	1,814.0000	4	CEUX
Genmab A/S	21/06/2024	12:09:43 PM	1,814.0000	43	CEUX
Genmab A/S	21/06/2024	12:09:43 PM	1,814.0000	7	AQEU
Genmab A/S	21/06/2024	12:09:43 PM	1,814.0000	68	TQEX
Genmab A/S	21/06/2024	12:09:43 PM	1,814.0000	7	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,814.0000	34	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,814.0000	18	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.5000	46	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.5000	15	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.5000	31	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.5000	19	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	20	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	16	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	4	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	12	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	2	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	18	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	20	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	20	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	12	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	18	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	20	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	46	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	2	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	3	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	20	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	36	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	6	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	9	AQEU
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,813.0000	3	TQEX
Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	8	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	15	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	12	CEUX
Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	25	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	27	XCSE

149

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	15	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	25	XCSE
Genmab A/S	21/06/2024	12:09:44 PM	1,812.0000	10	XCSE
Genmab A/S	21/06/2024	12:18:05 PM	1,814.5000	14	CEUX
Genmab A/S	21/06/2024	12:18:05 PM	1,814.5000	20	CEUX
Genmab A/S	21/06/2024	12:18:36 PM	1,815.0000	23	CEUX
Genmab A/S	21/06/2024	12:18:36 PM	1,815.0000	34	CEUX
Genmab A/S	21/06/2024	12:18:36 PM	1,815.0000	9	TQEX
Genmab A/S	21/06/2024	12:18:36 PM	1,815.0000	40	XCSE
Genmab A/S	21/06/2024	12:18:36 PM	1,815.0000	63	XCSE
Genmab A/S	21/06/2024	12:18:40 PM	1,815.0000	21	CEUX
Genmab A/S	21/06/2024	12:20:10 PM	1,815.0000	36	XCSE
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	143	XCSE
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	89	XCSE
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	129	CEUX
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	44	CEUX
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	7	AQEU
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	20	TQEX
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	12	TQEX
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	18	CEUX
Genmab A/S	21/06/2024	12:20:26 PM	1,814.0000	22	XCSE
Genmab A/S	21/06/2024	12:20:26 PM	1,814.0000	25	XCSE
Genmab A/S	21/06/2024	12:20:26 PM	1,814.5000	42	AQEU
Genmab A/S	21/06/2024	12:20:26 PM	1,814.0000	22	XCSE
Genmab A/S	21/06/2024	12:20:26 PM	1,814.0000	25	XCSE
Genmab A/S	21/06/2024	12:20:26 PM	1,814.0000	21	CEUX
Genmab A/S	21/06/2024	12:20:26 PM	1,814.0000	9	CEUX
Genmab A/S	21/06/2024	12:20:37 PM	1,813.5000	46	XCSE
Genmab A/S	21/06/2024	12:20:37 PM	1,813.5000	43	XCSE
Genmab A/S	21/06/2024	12:27:39 PM	1,814.5000	12	CEUX
Genmab A/S	21/06/2024	12:27:50 PM	1,815.0000	36	XCSE
Genmab A/S	21/06/2024	12:27:50 PM	1,814.5000	12	CEUX
Genmab A/S	21/06/2024	12:27:50 PM	1,814.5000	5	CEUX
Genmab A/S	21/06/2024	12:27:50 PM	1,814.5000	11	XCSE
Genmab A/S	21/06/2024	12:27:50 PM	1,814.5000	51	XCSE
Genmab A/S	21/06/2024	12:27:50 PM	1,814.5000	26	CEUX
Genmab A/S	21/06/2024	12:27:50 PM	1,814.5000	9	TQEX
Genmab A/S	21/06/2024	12:27:50 PM	1,814.5000	26	CEUX
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	56	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	6	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	6	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	1	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	29	CEUX
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	9	CEUX
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	8	AQEU
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	8	AQEU
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	9	TQEX
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	9	TQEX
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	36	CEUX

150

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	12:27:53 PM	1,814.0000	148	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,814.0000	36	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,814.5000	11	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,813.5000	21	XCSE
Genmab A/S	21/06/2024	12:27:53 PM	1,813.5000	20	CEUX
Genmab A/S	21/06/2024	12:27:53 PM	1,813.5000	2	AQEU
Genmab A/S	21/06/2024	12:27:53 PM	1,813.5000	2	AQEU
Genmab A/S	21/06/2024	12:27:53 PM	1,813.5000	5	TQEX
Genmab A/S	21/06/2024	12:27:53 PM	1,813.5000	21	XCSE
Genmab A/S	21/06/2024	12:33:47 PM	1,814.5000	13	CEUX
Genmab A/S	21/06/2024	12:33:47 PM	1,814.5000	25	XCSE
Genmab A/S	21/06/2024	12:33:47 PM	1,814.5000	2	XCSE
Genmab A/S	21/06/2024	12:33:47 PM	1,814.5000	17	XCSE
Genmab A/S	21/06/2024	12:33:47 PM	1,814.5000	11	CEUX
Genmab A/S	21/06/2024	12:33:47 PM	1,814.5000	2	XCSE
Genmab A/S	21/06/2024	12:37:34 PM	1,816.0000	12	CEUX
Genmab A/S	21/06/2024	12:37:34 PM	1,816.0000	25	CEUX
Genmab A/S	21/06/2024	12:37:34 PM	1,816.0000	13	XCSE
Genmab A/S	21/06/2024	12:37:34 PM	1,816.0000	26	XCSE
Genmab A/S	21/06/2024	12:37:34 PM	1,816.0000	13	XCSE
Genmab A/S	21/06/2024	12:37:34 PM	1,816.0000	22	XCSE
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	12	CEUX
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	25	CEUX
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	4	XCSE
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	6	XCSE
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	2	CEUX
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	5	CEUX
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	7	XCSE
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	14	XCSE
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	12	XCSE
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	13	XCSE
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	20	CEUX
Genmab A/S	21/06/2024	12:37:35 PM	1,816.0000	12	CEUX
Genmab A/S	21/06/2024	12:37:38 PM	1,815.5000	3	AQEU
Genmab A/S	21/06/2024	12:37:48 PM	1,816.0000	13	CEUX
Genmab A/S	21/06/2024	12:37:48 PM	1,816.0000	10	TQEX
Genmab A/S	21/06/2024	12:37:48 PM	1,816.0000	10	XCSE
Genmab A/S	21/06/2024	12:37:48 PM	1,816.0000	8	XCSE
Genmab A/S	21/06/2024	12:38:09 PM	1,816.0000	36	CEUX
Genmab A/S	21/06/2024	12:39:16 PM	1,816.0000	50	XCSE
Genmab A/S	21/06/2024	12:39:17 PM	1,816.0000	8	XCSE
Genmab A/S	21/06/2024	12:39:17 PM	1,816.0000	14	XCSE
Genmab A/S	21/06/2024	12:39:17 PM	1,816.0000	20	XCSE
Genmab A/S	21/06/2024	12:39:17 PM	1,816.0000	8	XCSE
Genmab A/S	21/06/2024	12:39:17 PM	1,816.0000	17	XCSE
Genmab A/S	21/06/2024	12:41:26 PM	1,816.0000	40	XCSE
Genmab A/S	21/06/2024	12:41:26 PM	1,816.0000	54	XCSE
Genmab A/S	21/06/2024	12:42:25 PM	1,816.0000	13	CEUX

151

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	12:42:25 PM	1,816.0000	6	AQEU
Genmab A/S	21/06/2024	12:43:08 PM	1,816.0000	2	CEUX
Genmab A/S	21/06/2024	12:43:08 PM	1,816.0000	6	AQEU
Genmab A/S	21/06/2024	12:43:08 PM	1,816.0000	19	CEUX
Genmab A/S	21/06/2024	12:44:40 PM	1,817.0000	23	CEUX
Genmab A/S	21/06/2024	12:44:40 PM	1,817.0000	19	CEUX
Genmab A/S	21/06/2024	12:44:40 PM	1,817.0000	4	CEUX
Genmab A/S	21/06/2024	12:44:40 PM	1,817.0000	23	CEUX
Genmab A/S	21/06/2024	12:44:40 PM	1,817.0000	24	XCSE
Genmab A/S	21/06/2024	12:44:53 PM	1,817.5000	2	CEUX
Genmab A/S	21/06/2024	12:44:53 PM	1,817.5000	13	CEUX
Genmab A/S	21/06/2024	12:45:17 PM	1,817.0000	7	CEUX
Genmab A/S	21/06/2024	12:46:11 PM	1,817.0000	13	CEUX
Genmab A/S	21/06/2024	12:46:11 PM	1,817.0000	6	CEUX
Genmab A/S	21/06/2024	12:46:55 PM	1,817.5000	3	XCSE
Genmab A/S	21/06/2024	12:47:58 PM	1,817.5000	14	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	6	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	50	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	26	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	3	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	20	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	15	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	12	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	6	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	14	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	3	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	12	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	8	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	20	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	7	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	10	CEUX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU

152

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	14	TQEX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	14	TQEX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	5	TQEX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	14	TQEX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	3	TQEX
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	12	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	50	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	33	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	20	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	48	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	5	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	20	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	30	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,817.0000	3	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,816.5000	24	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,816.5000	24	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,816.5000	24	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,816.5000	24	XCSE
Genmab A/S	21/06/2024	12:48:42 PM	1,816.5000	21	XCSE
Genmab A/S	21/06/2024	12:49:16 PM	1,815.0000	36	CEUX
Genmab A/S	21/06/2024	12:49:16 PM	1,815.0000	9	CEUX
Genmab A/S	21/06/2024	12:49:16 PM	1,815.0000	2	CEUX
Genmab A/S	21/06/2024	12:49:16 PM	1,815.0000	15	CEUX
Genmab A/S	21/06/2024	12:49:16 PM	1,815.0000	35	CEUX
Genmab A/S	21/06/2024	12:49:16 PM	1,815.0000	16	CEUX
Genmab A/S	21/06/2024	12:49:16 PM	1,815.0000	1	TQEX
Genmab A/S	21/06/2024	12:50:53 PM	1,816.0000	17	CEUX
Genmab A/S	21/06/2024	12:50:53 PM	1,816.0000	5	CEUX
Genmab A/S	21/06/2024	12:51:03 PM	1,816.0000	19	CEUX
Genmab A/S	21/06/2024	12:51:53 PM	1,816.0000	10	CEUX
Genmab A/S	21/06/2024	12:51:53 PM	1,816.0000	10	XCSE
Genmab A/S	21/06/2024	12:53:10 PM	1,816.5000	19	CEUX
Genmab A/S	21/06/2024	12:53:10 PM	1,816.5000	19	CEUX
Genmab A/S	21/06/2024	12:53:10 PM	1,816.5000	5	TQEX
Genmab A/S	21/06/2024	12:53:10 PM	1,816.5000	6	TQEX
Genmab A/S	21/06/2024	12:53:32 PM	1,817.0000	42	CEUX
Genmab A/S	21/06/2024	12:53:32 PM	1,817.0000	42	CEUX
Genmab A/S	21/06/2024	12:53:32 PM	1,817.0000	26	CEUX
Genmab A/S	21/06/2024	12:53:38 PM	1,816.5000	2	AQEU
Genmab A/S	21/06/2024	12:53:38 PM	1,816.5000	14	AQEU
Genmab A/S	21/06/2024	12:53:38 PM	1,816.5000	9	TQEX
Genmab A/S	21/06/2024	12:53:38 PM	1,816.5000	5	TQEX
Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	42	CEUX

153

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	42	CEUX
Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	42	CEUX
Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	42	CEUX
Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	8	CEUX
Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	40	CEUX
Genmab A/S	21/06/2024	12:53:38 PM	1,816.5000	19	XCSE
Genmab A/S	21/06/2024	12:53:38 PM	1,816.5000	83	XCSE
Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	2	CEUX
Genmab A/S	21/06/2024	12:53:38 PM	1,817.0000	12	CEUX
Genmab A/S	21/06/2024	12:55:27 PM	1,817.5000	13	CEUX
Genmab A/S	21/06/2024	12:56:31 PM	1,817.5000	16	XCSE
Genmab A/S	21/06/2024	12:56:31 PM	1,817.5000	72	XCSE
Genmab A/S	21/06/2024	12:57:04 PM	1,818.0000	48	XCSE
Genmab A/S	21/06/2024	12:57:04 PM	1,818.0000	19	XCSE
Genmab A/S	21/06/2024	12:57:04 PM	1,818.0000	29	XCSE
Genmab A/S	21/06/2024	12:57:04 PM	1,818.0000	18	XCSE
Genmab A/S	21/06/2024	12:57:18 PM	1,818.0000	34	CEUX
Genmab A/S	21/06/2024	1:00:33 PM	1,818.5000	13	XCSE
Genmab A/S	21/06/2024	1:01:35 PM	1,818.5000	3	XCSE
Genmab A/S	21/06/2024	1:01:37 PM	1,818.5000	1	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	16	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	22	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	22	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	22	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	7	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	5	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	10	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	7	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	8	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	7	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	7	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	8	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	8	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	9	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	18	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	18	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE

154

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	24	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	1	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.5000	8	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	16	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	7	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	10	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	1	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	17	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	16	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	11	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	18	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	18	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	16	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	7	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	4	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	17	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	1	TQEX

155

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	10	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	7	CEUX
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	15	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	42	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,819.0000	17	XCSE
Genmab A/S	21/06/2024	1:03:08 PM	1,818.5000	3	AQEU
Genmab A/S	21/06/2024	1:03:09 PM	1,818.5000	6	XCSE
Genmab A/S	21/06/2024	1:08:18 PM	1,819.5000	15	XCSE
Genmab A/S	21/06/2024	1:08:18 PM	1,819.5000	20	XCSE
Genmab A/S	21/06/2024	1:08:44 PM	1,819.5000	12	XCSE
Genmab A/S	21/06/2024	1:08:44 PM	1,819.5000	21	XCSE
Genmab A/S	21/06/2024	1:09:15 PM	1,819.5000	13	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	43	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	44	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	43	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	10	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	9	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	10	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	7	TQEX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	10	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	48	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	50	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	9	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	39	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	19	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	14	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	36	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	9	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	19	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	15	CEUX
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	6	AQEU
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	21	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	8	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	7	XCSE
Genmab A/S	21/06/2024	1:10:45 PM	1,819.5000	16	CEUX
Genmab A/S	21/06/2024	1:13:24 PM	1,819.0000	26	CEUX
Genmab A/S	21/06/2024	1:13:24 PM	1,819.0000	56	CEUX
Genmab A/S	21/06/2024	1:13:24 PM	1,819.0000	13	TQEX
Genmab A/S	21/06/2024	1:13:24 PM	1,819.0000	91	XCSE
Genmab A/S	21/06/2024	1:13:24 PM	1,819.0000	12	AQEU
Genmab A/S	21/06/2024	1:13:24 PM	1,818.5000	88	XCSE
Genmab A/S	21/06/2024	1:13:24 PM	1,818.5000	50	XCSE
Genmab A/S	21/06/2024	1:19:11 PM	1,821.5000	17	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,822.0000	1	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,822.0000	16	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,822.0000	4	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,822.0000	9	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	31	XCSE

156

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	31	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	12	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	2	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	17	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	2	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	13	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	13	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	3	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	2	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	3	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	5	TQEX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	5	TQEX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	10	TQEX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	30	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	13	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	17	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	9	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	5	TQEX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.5000	56	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	20	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	10	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	10	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	20	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	20	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	13	CEUX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	2	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	4	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	2	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	2	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	2	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	2	AQEU
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	5	TQEX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	5	TQEX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	5	TQEX
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	20	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	4	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	2	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	18	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	15	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	49	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,821.0000	11	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,820.5000	6	XCSE
Genmab A/S	21/06/2024	1:19:41 PM	1,820.5000	3	XCSE
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	11	CEUX
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	72	CEUX
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	22	CEUX
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	22	CEUX
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	22	CEUX
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	4	CEUX

157

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	1	AQEU
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	14	XCSE
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	23	XCSE
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	16	XCSE
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	7	XCSE
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	9	XCSE
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	36	CEUX
Genmab A/S	21/06/2024	1:19:43 PM	1,820.5000	7	AQEU
Genmab A/S	21/06/2024	1:25:20 PM	1,820.0000	86	XCSE
Genmab A/S	21/06/2024	1:27:00 PM	1,820.0000	24	CEUX
Genmab A/S	21/06/2024	1:29:36 PM	1,821.0000	55	CEUX
Genmab A/S	21/06/2024	1:29:36 PM	1,821.0000	23	CEUX
Genmab A/S	21/06/2024	1:29:48 PM	1,821.0000	20	CEUX
Genmab A/S	21/06/2024	1:29:48 PM	1,821.0000	14	CEUX
Genmab A/S	21/06/2024	1:29:56 PM	1,820.5000	3	AQEU
Genmab A/S	21/06/2024	1:29:56 PM	1,820.5000	4	AQEU
Genmab A/S	21/06/2024	1:30:14 PM	1,821.0000	9	CEUX
Genmab A/S	21/06/2024	1:30:14 PM	1,821.0000	10	XCSE
Genmab A/S	21/06/2024	1:30:14 PM	1,821.0000	34	TQEX
Genmab A/S	21/06/2024	1:30:41 PM	1,820.5000	17	CEUX
Genmab A/S	21/06/2024	1:30:41 PM	1,820.5000	10	AQEU
Genmab A/S	21/06/2024	1:30:41 PM	1,820.5000	7	TQEX
Genmab A/S	21/06/2024	1:31:44 PM	1,821.0000	50	CEUX
Genmab A/S	21/06/2024	1:31:44 PM	1,821.0000	30	CEUX
Genmab A/S	21/06/2024	1:31:44 PM	1,821.0000	10	CEUX
Genmab A/S	21/06/2024	1:31:44 PM	1,821.0000	6	CEUX
Genmab A/S	21/06/2024	1:31:44 PM	1,821.0000	6	CEUX
Genmab A/S	21/06/2024	1:31:44 PM	1,821.0000	3	AQEU
Genmab A/S	21/06/2024	1:31:44 PM	1,821.0000	3	AQEU
Genmab A/S	21/06/2024	1:32:06 PM	1,821.5000	7	CEUX
Genmab A/S	21/06/2024	1:32:06 PM	1,821.5000	12	CEUX
Genmab A/S	21/06/2024	1:32:06 PM	1,821.5000	17	CEUX
Genmab A/S	21/06/2024	1:32:32 PM	1,821.5000	1	CEUX
Genmab A/S	21/06/2024	1:32:32 PM	1,821.5000	3	CEUX
Genmab A/S	21/06/2024	1:32:32 PM	1,821.5000	7	CEUX
Genmab A/S	21/06/2024	1:32:42 PM	1,821.5000	7	CEUX
Genmab A/S	21/06/2024	1:32:42 PM	1,821.5000	6	CEUX
Genmab A/S	21/06/2024	1:32:42 PM	1,821.5000	2	CEUX
Genmab A/S	21/06/2024	1:32:50 PM	1,821.5000	12	CEUX
Genmab A/S	21/06/2024	1:32:50 PM	1,821.5000	6	CEUX
Genmab A/S	21/06/2024	1:32:50 PM	1,821.5000	6	CEUX
Genmab A/S	21/06/2024	1:33:08 PM	1,821.5000	3	CEUX
Genmab A/S	21/06/2024	1:33:08 PM	1,821.5000	6	CEUX
Genmab A/S	21/06/2024	1:33:08 PM	1,821.5000	6	CEUX
Genmab A/S	21/06/2024	1:33:23 PM	1,821.5000	7	CEUX
Genmab A/S	21/06/2024	1:33:23 PM	1,821.5000	7	CEUX
Genmab A/S	21/06/2024	1:33:23 PM	1,821.5000	20	CEUX
Genmab A/S	21/06/2024	1:33:27 PM	1,820.5000	12	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	11	CEUX

158

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	50	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	12	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	18	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	18	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	13	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	12	AQEU
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	2	AQEU
Genmab A/S	21/06/2024	1:33:42 PM	1,821.0000	36	AQEU
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	25	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	2	AQEU
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	5	TQEX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	16	TQEX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	13	TQEX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	5	TQEX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	6	XCSE
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	50	XCSE
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	39	XCSE
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	11	XCSE
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	8	XCSE
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	33	XCSE
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	12	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	6	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	2	CEUX
Genmab A/S	21/06/2024	1:33:42 PM	1,820.5000	15	CEUX
Genmab A/S	21/06/2024	1:37:52 PM	1,819.5000	22	XCSE
Genmab A/S	21/06/2024	1:37:52 PM	1,819.5000	78	XCSE
Genmab A/S	21/06/2024	1:37:52 PM	1,819.5000	16	XCSE
Genmab A/S	21/06/2024	1:37:52 PM	1,819.5000	3	CEUX
Genmab A/S	21/06/2024	1:39:04 PM	1,819.5000	14	CEUX
Genmab A/S	21/06/2024	1:39:04 PM	1,819.5000	16	XCSE
Genmab A/S	21/06/2024	1:39:04 PM	1,819.5000	9	XCSE
Genmab A/S	21/06/2024	1:39:04 PM	1,819.5000	43	XCSE
Genmab A/S	21/06/2024	1:39:04 PM	1,819.5000	16	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	75	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	39	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	75	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	16	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	48	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	68	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	53	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	14	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	10	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	10	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	10	TQEX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	20	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	1	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	20	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU

159

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	39	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	7	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	39	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	11	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.5000	5	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	6	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	16	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	16	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	6	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	8	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	6	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	22	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	11	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	8	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	13	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	13	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	8	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	21	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	15	CEUX
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	40	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	10	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	3	AQEU
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	11	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	35	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	4	XCSE
Genmab A/S	21/06/2024	1:40:45 PM	1,819.0000	4	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	10	AQEU
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	24	CEUX
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	60	CEUX
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	2	AQEU
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	13	TQEX
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	9	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	9	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,817.0000	75	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	21	CEUX
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	23	CEUX
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	21	CEUX
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	23	CEUX
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	4	AQEU
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	2	XCSE

160

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	21	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	46	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	25	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	49	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	43	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	30	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	46	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	25	XCSE
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	1:49:43 PM	1,816.5000	4	AQEU
Genmab A/S	21/06/2024	1:49:44 PM	1,816.5000	39	CEUX
Genmab A/S	21/06/2024	1:49:44 PM	1,816.5000	6	CEUX
Genmab A/S	21/06/2024	1:49:44 PM	1,816.5000	36	XCSE
Genmab A/S	21/06/2024	1:49:48 PM	1,816.5000	11	XCSE
Genmab A/S	21/06/2024	1:49:48 PM	1,816.5000	11	XCSE
Genmab A/S	21/06/2024	1:49:48 PM	1,816.5000	7	CEUX
Genmab A/S	21/06/2024	1:49:48 PM	1,816.5000	23	CEUX
Genmab A/S	21/06/2024	1:49:48 PM	1,816.5000	14	XCSE
Genmab A/S	21/06/2024	1:49:48 PM	1,816.5000	5	CEUX
Genmab A/S	21/06/2024	1:57:27 PM	1,812.0000	59	CEUX
Genmab A/S	21/06/2024	1:59:14 PM	1,813.5000	37	CEUX
Genmab A/S	21/06/2024	1:59:37 PM	1,813.5000	37	XCSE
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	37	CEUX
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	15	CEUX
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	8	AQEU
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	6	TQEX
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	58	XCSE
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	25	XCSE
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	2	CEUX
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	2	AQEU
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	20	TQEX
Genmab A/S	21/06/2024	1:59:42 PM	1,813.0000	3	TQEX
Genmab A/S	21/06/2024	2:00:44 PM	1,813.5000	14	CEUX
Genmab A/S	21/06/2024	2:00:45 PM	1,813.5000	17	XCSE
Genmab A/S	21/06/2024	2:00:45 PM	1,813.5000	47	CEUX
Genmab A/S	21/06/2024	2:00:50 PM	1,812.5000	20	CEUX
Genmab A/S	21/06/2024	2:00:50 PM	1,812.5000	3	AQEU
Genmab A/S	21/06/2024	2:00:50 PM	1,812.5000	5	TQEX
Genmab A/S	21/06/2024	2:00:50 PM	1,812.5000	22	XCSE
Genmab A/S	21/06/2024	2:00:50 PM	1,812.5000	45	XCSE
Genmab A/S	21/06/2024	2:00:50 PM	1,812.5000	13	XCSE
Genmab A/S	21/06/2024	2:00:51 PM	1,812.5000	3	XCSE
Genmab A/S	21/06/2024	2:00:51 PM	1,812.5000	34	XCSE
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	5	TQEX
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	31	CEUX
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	15	CEUX
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	5	CEUX
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	5	AQEU
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	3	AQEU

161

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	1	AQEU
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	32	XCSE
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	17	XCSE
Genmab A/S	21/06/2024	2:03:52 PM	1,813.0000	10	XCSE
Genmab A/S	21/06/2024	2:07:40 PM	1,817.5000	12	CEUX
Genmab A/S	21/06/2024	2:07:40 PM	1,817.5000	37	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	6	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	9	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	4	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	33	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	6	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	9	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	6	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	10	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	16	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:07 PM	1,818.0000	2	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	22	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	4	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	18	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	8	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	21	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	5	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	10	CEUX

162

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	16	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	10	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	16	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	10	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	26	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	25	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	3	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	25	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	41	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	41	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	28	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	16	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	12	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	16	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	9	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	13	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	26	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	15	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	11	CEUX
Genmab A/S	21/06/2024	2:11:08 PM	1,818.0000	1	CEUX
Genmab A/S	21/06/2024	2:18:43 PM	1,816.5000	30	CEUX
Genmab A/S	21/06/2024	2:19:01 PM	1,816.5000	15	CEUX
Genmab A/S	21/06/2024	2:19:01 PM	1,816.5000	15	CEUX
Genmab A/S	21/06/2024	2:19:01 PM	1,816.5000	5	TQEX
Genmab A/S	21/06/2024	2:19:02 PM	1,816.5000	15	CEUX
Genmab A/S	21/06/2024	2:19:06 PM	1,816.5000	15	CEUX
Genmab A/S	21/06/2024	2:19:10 PM	1,816.5000	15	CEUX

163

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:19:10 PM	1,816.5000	5	TQEX
Genmab A/S	21/06/2024	2:20:56 PM	1,816.0000	8	XCSE
Genmab A/S	21/06/2024	2:20:56 PM	1,816.0000	2	XCSE
Genmab A/S	21/06/2024	2:21:22 PM	1,816.0000	5	TQEX
Genmab A/S	21/06/2024	2:21:22 PM	1,816.0000	8	TQEX
Genmab A/S	21/06/2024	2:21:47 PM	1,816.5000	11	AQEU
Genmab A/S	21/06/2024	2:21:47 PM	1,816.5000	6	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	56	CEUX
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	50	CEUX
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	6	CEUX
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	4	CEUX
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	21	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	8	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	8	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	8	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	8	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	61	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	17	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	23	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	38	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	5	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	28	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.0000	26	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	1	CEUX
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	2	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	5	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.5000	45	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.0000	2	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.0000	22	CEUX
Genmab A/S	21/06/2024	2:21:58 PM	1,816.0000	4	AQEU
Genmab A/S	21/06/2024	2:21:58 PM	1,816.0000	18	XCSE
Genmab A/S	21/06/2024	2:21:58 PM	1,816.0000	6	XCSE
Genmab A/S	21/06/2024	2:22:04 PM	1,816.0000	1	CEUX
Genmab A/S	21/06/2024	2:22:04 PM	1,816.0000	4	AQEU
Genmab A/S	21/06/2024	2:22:04 PM	1,816.0000	1	AQEU
Genmab A/S	21/06/2024	2:22:04 PM	1,816.0000	26	XCSE
Genmab A/S	21/06/2024	2:22:04 PM	1,816.0000	11	XCSE
Genmab A/S	21/06/2024	2:24:42 PM	1,818.0000	4	CEUX
Genmab A/S	21/06/2024	2:24:42 PM	1,818.0000	4	CEUX
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	34	CEUX
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	20	CEUX
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	6	AQEU
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	3	AQEU
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	7	TQEX
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	4	TQEX
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	47	XCSE
Genmab A/S	21/06/2024	2:24:43 PM	1,818.0000	29	XCSE
Genmab A/S	21/06/2024	2:26:29 PM	1,817.0000	32	XCSE
Genmab A/S	21/06/2024	2:26:29 PM	1,817.0000	139	XCSE

164

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:26:29 PM	1,817.0000	29	CEUX
Genmab A/S	21/06/2024	2:26:29 PM	1,817.0000	2	CEUX
Genmab A/S	21/06/2024	2:26:29 PM	1,817.0000	13	CEUX
Genmab A/S	21/06/2024	2:26:29 PM	1,817.0000	4	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,817.0000	14	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,817.0000	32	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,817.0000	24	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,817.0000	4	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,817.0000	65	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,817.0000	12	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	23	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	25	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	19	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	4	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	25	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	11	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	18	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	4	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	21	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	20	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	2	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	21	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	22	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	4	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	4	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	2	TQEX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	10	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	22	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	4	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	1	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	4	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	4	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	1	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	1	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	TQEX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	TQEX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	2	TQEX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	5	TQEX

165

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	36	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	9	AQEU
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	5	TQEX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	3	CEUX
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	1	XCSE
Genmab A/S	21/06/2024	2:26:30 PM	1,816.5000	16	CEUX
Genmab A/S	21/06/2024	2:31:03 PM	1,815.0000	14	CEUX
Genmab A/S	21/06/2024	2:34:56 PM	1,817.5000	19	CEUX
Genmab A/S	21/06/2024	2:34:56 PM	1,817.5000	1	CEUX
Genmab A/S	21/06/2024	2:34:56 PM	1,817.5000	4	CEUX
Genmab A/S	21/06/2024	2:34:56 PM	1,817.5000	1	CEUX
Genmab A/S	21/06/2024	2:34:56 PM	1,818.0000	10	XCSE
Genmab A/S	21/06/2024	2:34:56 PM	1,818.0000	12	XCSE
Genmab A/S	21/06/2024	2:34:56 PM	1,818.0000	13	XCSE
Genmab A/S	21/06/2024	2:34:56 PM	1,817.5000	21	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	50	CEUX
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	45	CEUX
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	10	CEUX
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	7	TQEX
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	35	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	55	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	44	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	6	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	43	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	12	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	50	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	5	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	55	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	21	XCSE
Genmab A/S	21/06/2024	2:36:09 PM	1,817.5000	40	CEUX
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	40	CEUX
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	74	CEUX
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	6	AQEU
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	3	AQEU
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	38	XCSE
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	6	XCSE
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	9	XCSE
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	44	XCSE
Genmab A/S	21/06/2024	2:39:43 PM	1,818.5000	6	XCSE
Genmab A/S	21/06/2024	2:41:31 PM	1,820.0000	22	CEUX
Genmab A/S	21/06/2024	2:41:31 PM	1,820.0000	15	CEUX
Genmab A/S	21/06/2024	2:41:46 PM	1,820.0000	32	XCSE
Genmab A/S	21/06/2024	2:41:46 PM	1,820.0000	8	XCSE
Genmab A/S	21/06/2024	2:41:47 PM	1,820.0000	20	CEUX
Genmab A/S	21/06/2024	2:41:47 PM	1,820.0000	6	CEUX
Genmab A/S	21/06/2024	2:41:47 PM	1,820.0000	7	CEUX
Genmab A/S	21/06/2024	2:41:47 PM	1,820.0000	1	CEUX
Genmab A/S	21/06/2024	2:42:08 PM	1,820.0000	7	CEUX
Genmab A/S	21/06/2024	2:42:08 PM	1,820.0000	7	CEUX

166

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:42:08 PM	1,820.0000	20	CEUX
Genmab A/S	21/06/2024	2:42:21 PM	1,820.0000	4	XCSE
Genmab A/S	21/06/2024	2:42:31 PM	1,820.5000	10	XCSE
Genmab A/S	21/06/2024	2:42:31 PM	1,820.5000	26	XCSE
Genmab A/S	21/06/2024	2:42:42 PM	1,820.5000	10	XCSE
Genmab A/S	21/06/2024	2:42:42 PM	1,820.5000	13	XCSE
Genmab A/S	21/06/2024	2:42:42 PM	1,820.5000	13	XCSE
Genmab A/S	21/06/2024	2:42:42 PM	1,820.5000	4	XCSE
Genmab A/S	21/06/2024	2:43:01 PM	1,819.5000	28	XCSE
Genmab A/S	21/06/2024	2:43:01 PM	1,819.5000	19	XCSE
Genmab A/S	21/06/2024	2:43:01 PM	1,819.5000	37	XCSE
Genmab A/S	21/06/2024	2:43:43 PM	1,820.0000	13	CEUX
Genmab A/S	21/06/2024	2:43:45 PM	1,820.0000	11	CEUX
Genmab A/S	21/06/2024	2:43:45 PM	1,820.0000	11	CEUX
Genmab A/S	21/06/2024	2:44:23 PM	1,820.0000	28	XCSE
Genmab A/S	21/06/2024	2:44:23 PM	1,820.0000	59	XCSE
Genmab A/S	21/06/2024	2:44:23 PM	1,820.0000	25	CEUX
Genmab A/S	21/06/2024	2:44:24 PM	1,820.0000	16	XCSE
Genmab A/S	21/06/2024	2:45:24 PM	1,820.5000	10	XCSE
Genmab A/S	21/06/2024	2:45:24 PM	1,820.5000	60	XCSE
Genmab A/S	21/06/2024	2:46:13 PM	1,822.5000	52	CEUX
Genmab A/S	21/06/2024	2:46:13 PM	1,822.5000	52	CEUX
Genmab A/S	21/06/2024	2:46:13 PM	1,822.5000	12	CEUX
Genmab A/S	21/06/2024	2:46:13 PM	1,822.5000	4	CEUX
Genmab A/S	21/06/2024	2:47:00 PM	1,822.5000	72	CEUX
Genmab A/S	21/06/2024	2:47:00 PM	1,822.5000	43	CEUX
Genmab A/S	21/06/2024	2:47:00 PM	1,822.5000	8	XCSE
Genmab A/S	21/06/2024	2:47:24 PM	1,823.5000	36	XCSE
Genmab A/S	21/06/2024	2:47:36 PM	1,823.5000	35	XCSE
Genmab A/S	21/06/2024	2:47:56 PM	1,823.5000	33	XCSE
Genmab A/S	21/06/2024	2:48:06 PM	1,823.5000	38	XCSE
Genmab A/S	21/06/2024	2:48:51 PM	1,824.0000	50	XCSE
Genmab A/S	21/06/2024	2:48:51 PM	1,824.0000	9	XCSE
Genmab A/S	21/06/2024	2:49:21 PM	1,824.5000	39	XCSE
Genmab A/S	21/06/2024	2:49:21 PM	1,824.5000	53	XCSE
Genmab A/S	21/06/2024	2:49:21 PM	1,824.5000	78	XCSE
Genmab A/S	21/06/2024	2:49:21 PM	1,824.5000	47	CEUX
Genmab A/S	21/06/2024	2:49:21 PM	1,824.5000	7	AQEU
Genmab A/S	21/06/2024	2:49:21 PM	1,824.5000	47	CEUX
Genmab A/S	21/06/2024	2:49:35 PM	1,824.5000	22	XCSE
Genmab A/S	21/06/2024	2:50:57 PM	1,824.5000	23	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	43	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	9	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	22	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	41	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	9	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	XCSE

167

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	22	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	16	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	24	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	22	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	17	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	22	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	3	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	3	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	3	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	19	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	98	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	30	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	7	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	3	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	4	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX

168

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	1	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	11	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	9	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	55	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,824.5000	10	CEUX
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	3	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,824.5000	30	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,824.5000	20	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,824.5000	16	XCSE
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	10	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	2	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,825.0000	1	AQEU
Genmab A/S	21/06/2024	2:54:58 PM	1,824.5000	36	XCSE
Genmab A/S	21/06/2024	2:56:52 PM	1,823.0000	13	TQEX
Genmab A/S	21/06/2024	3:01:02 PM	1,820.5000	5	TQEX
Genmab A/S	21/06/2024	3:01:02 PM	1,820.5000	1	TQEX
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	29	CEUX
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	29	CEUX
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	29	CEUX
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	17	CEUX
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	5	AQEU
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	2	AQEU
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	32	XCSE
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	132	XCSE
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	29	CEUX
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	17	CEUX
Genmab A/S	21/06/2024	3:01:02 PM	1,821.0000	5	AQEU

169

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	31	CEUX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	52	CEUX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	5	TQEX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	5	TQEX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	30	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	3	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	57	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	5	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	24	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	36	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	13	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	8	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	9	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	27	CEUX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	52	CEUX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	5	TQEX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	5	TQEX
Genmab A/S	21/06/2024	3:03:05 PM	1,820.5000	13	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	51	CEUX
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	3	AQEU
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	50	AQEU
Genmab A/S	21/06/2024	3:03:05 PM	1,821.0000	16	AQEU
Genmab A/S	21/06/2024	3:03:05 PM	1,820.5000	7	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,820.5000	19	XCSE
Genmab A/S	21/06/2024	3:03:05 PM	1,820.5000	19	CEUX
Genmab A/S	21/06/2024	3:03:05 PM	1,820.5000	1	XCSE
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	9	CEUX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	1	AQEU
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	43	AQEU
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	5	TQEX
Genmab A/S	21/06/2024	3:07:40 PM	1,819.0000	41	TQEX
Genmab A/S	21/06/2024	3:07:41 PM	1,819.0000	9	XCSE
Genmab A/S	21/06/2024	3:07:41 PM	1,819.0000	89	XCSE
Genmab A/S	21/06/2024	3:08:58 PM	1,818.5000	19	CEUX
Genmab A/S	21/06/2024	3:08:58 PM	1,818.5000	21	XCSE
Genmab A/S	21/06/2024	3:08:58 PM	1,818.5000	1	CEUX
Genmab A/S	21/06/2024	3:08:58 PM	1,818.5000	21	XCSE
Genmab A/S	21/06/2024	3:11:56 PM	1,818.0000	39	CEUX
Genmab A/S	21/06/2024	3:11:56 PM	1,818.0000	10	CEUX
Genmab A/S	21/06/2024	3:11:56 PM	1,818.0000	7	AQEU
Genmab A/S	21/06/2024	3:11:58 PM	1,818.0000	1	XCSE
Genmab A/S	21/06/2024	3:12:05 PM	1,818.0000	18	XCSE

170

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:12:05 PM	1,818.0000	2	AQEU
Genmab A/S	21/06/2024	3:12:05 PM	1,818.0000	35	XCSE
Genmab A/S	21/06/2024	3:13:01 PM	1,818.0000	34	CEUX
Genmab A/S	21/06/2024	3:13:20 PM	1,818.0000	2	CEUX
Genmab A/S	21/06/2024	3:13:20 PM	1,818.0000	2	CEUX
Genmab A/S	21/06/2024	3:13:20 PM	1,818.0000	20	CEUX
Genmab A/S	21/06/2024	3:13:20 PM	1,818.0000	10	CEUX
Genmab A/S	21/06/2024	3:13:20 PM	1,818.0000	1	CEUX
Genmab A/S	21/06/2024	3:13:35 PM	1,818.0000	38	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	50	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	10	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	35	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	19	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,818.0000	34	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	6	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	33	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	21	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	54	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	26	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	9	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	9	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	36	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	14	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	4	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	30	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	20	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	16	CEUX
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	8	AQEU
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	5	AQEU
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	8	AQEU
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	8	AQEU
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	8	AQEU
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	7	AQEU
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	60	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	25	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	25	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	35	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	26	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.5000	10	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.0000	2	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.0000	20	XCSE
Genmab A/S	21/06/2024	3:13:58 PM	1,817.0000	21	XCSE
Genmab A/S	21/06/2024	3:13:59 PM	1,817.0000	21	CEUX
Genmab A/S	21/06/2024	3:13:59 PM	1,817.0000	1	AQEU
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	10	CEUX
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	2	AQEU
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	1	AQEU

171

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	15	AQEU
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	126	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	10	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	24	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	1	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	24	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	1	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	31	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	24	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	21	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	10	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	7	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	126	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	10	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	126	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	10	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	86	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	43	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	4	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	1	CEUX
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	2	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	50	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	7	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	22	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	6	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	12	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	4	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	12	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	22	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,819.0000	12	CEUX
Genmab A/S	21/06/2024	3:20:50 PM	1,818.5000	36	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,818.5000	102	XCSE
Genmab A/S	21/06/2024	3:20:50 PM	1,818.5000	72	XCSE
Genmab A/S	21/06/2024	3:21:12 PM	1,817.5000	22	CEUX
Genmab A/S	21/06/2024	3:21:12 PM	1,817.5000	4	AQEU
Genmab A/S	21/06/2024	3:21:12 PM	1,817.5000	24	XCSE
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	22	CEUX
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	21	CEUX
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	4	AQEU
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	24	XCSE
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	24	XCSE
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	22	CEUX
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	22	CEUX
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	19	CEUX
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	4	AQEU
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	24	XCSE
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	50	XCSE
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	19	XCSE
Genmab A/S	21/06/2024	3:21:22 PM	1,817.5000	10	XCSE

172

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:24:51 PM	1,814.5000	8	CEUX
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	24	XCSE
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	105	XCSE
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	22	CEUX
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	22	CEUX
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	10	CEUX
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	18	CEUX
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	4	CEUX
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	4	AQEU
Genmab A/S	21/06/2024	3:25:54 PM	1,814.0000	18	AQEU
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	62	CEUX
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	49	CEUX
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	49	CEUX
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	14	CEUX
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	24	CEUX
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	7	CEUX
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	7	AQEU
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	3	AQEU
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	7	AQEU
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	7	AQEU
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	7	AQEU
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	7	AQEU
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	53	XCSE
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	39	XCSE
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	53	XCSE
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	13	XCSE
Genmab A/S	21/06/2024	3:29:21 PM	1,812.5000	6	CEUX
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	1	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	5	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	1	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	1	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	2	AQEU
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	27	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	18	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	42	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	45	XCSE

173

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	15	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	27	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	23	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	22	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	17	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	3	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	22	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	45	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	34	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	8	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	42	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	3	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	42	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	13	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	9	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	30	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	6	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	16	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	5	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	5	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	16	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	7	XCSE
Genmab A/S	21/06/2024	3:30:01 PM	1,811.5000	25	XCSE
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	22	XCSE
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	18	XCSE
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	33	XCSE
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	6	AQEU
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	6	AQEU
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	7	XCSE
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	33	XCSE
Genmab A/S	21/06/2024	3:32:54 PM	1,808.0000	6	AQEU
Genmab A/S	21/06/2024	3:32:55 PM	1,808.0000	3	AQEU
Genmab A/S	21/06/2024	3:32:55 PM	1,808.0000	33	XCSE
Genmab A/S	21/06/2024	3:32:55 PM	1,808.0000	7	XCSE
Genmab A/S	21/06/2024	3:37:09 PM	1,808.5000	12	AQEU
Genmab A/S	21/06/2024	3:37:09 PM	1,808.5000	16	AQEU
Genmab A/S	21/06/2024	3:37:09 PM	1,808.5000	31	XCSE
Genmab A/S	21/06/2024	3:37:09 PM	1,808.5000	22	XCSE
Genmab A/S	21/06/2024	3:37:09 PM	1,808.5000	35	XCSE
Genmab A/S	21/06/2024	3:37:09 PM	1,808.5000	50	XCSE
Genmab A/S	21/06/2024	3:37:09 PM	1,808.5000	12	AQEU
Genmab A/S	21/06/2024	3:38:07 PM	1,811.0000	37	XCSE
Genmab A/S	21/06/2024	3:38:07 PM	1,811.0000	11	XCSE
Genmab A/S	21/06/2024	3:38:07 PM	1,811.0000	26	CEUX
Genmab A/S	21/06/2024	3:38:07 PM	1,811.0000	17	CEUX
Genmab A/S	21/06/2024	3:38:07 PM	1,811.0000	19	CEUX
Genmab A/S	21/06/2024	3:38:07 PM	1,811.0000	1	CEUX
Genmab A/S	21/06/2024	3:38:16 PM	1,811.0000	44	XCSE
Genmab A/S	21/06/2024	3:38:16 PM	1,811.0000	28	CEUX

174

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:38:16 PM	1,811.0000	10	CEUX
Genmab A/S	21/06/2024	3:38:16 PM	1,811.0000	6	TQEX
Genmab A/S	21/06/2024	3:38:16 PM	1,811.0000	11	XCSE
Genmab A/S	21/06/2024	3:40:01 PM	1,811.0000	36	XCSE
Genmab A/S	21/06/2024	3:40:01 PM	1,811.0000	68	XCSE
Genmab A/S	21/06/2024	3:40:46 PM	1,814.0000	1	CEUX
Genmab A/S	21/06/2024	3:40:46 PM	1,814.0000	12	CEUX
Genmab A/S	21/06/2024	3:40:46 PM	1,814.0000	16	CEUX
Genmab A/S	21/06/2024	3:40:46 PM	1,814.0000	11	CEUX
Genmab A/S	21/06/2024	3:40:50 PM	1,813.0000	3	AQEU
Genmab A/S	21/06/2024	3:41:02 PM	1,814.0000	9	TQEX
Genmab A/S	21/06/2024	3:41:06 PM	1,814.0000	8	TQEX
Genmab A/S	21/06/2024	3:41:09 PM	1,814.0000	8	TQEX
Genmab A/S	21/06/2024	3:41:12 PM	1,813.5000	34	CEUX
Genmab A/S	21/06/2024	3:41:16 PM	1,814.0000	8	TQEX
Genmab A/S	21/06/2024	3:41:21 PM	1,814.0000	9	TQEX
Genmab A/S	21/06/2024	3:41:21 PM	1,814.0000	3	TQEX
Genmab A/S	21/06/2024	3:41:21 PM	1,814.0000	2	TQEX
Genmab A/S	21/06/2024	3:41:21 PM	1,814.0000	10	TQEX
Genmab A/S	21/06/2024	3:41:27 PM	1,814.0000	9	TQEX
Genmab A/S	21/06/2024	3:41:27 PM	1,814.0000	2	TQEX
Genmab A/S	21/06/2024	3:41:27 PM	1,814.0000	2	TQEX
Genmab A/S	21/06/2024	3:41:27 PM	1,814.0000	10	TQEX
Genmab A/S	21/06/2024	3:41:33 PM	1,814.0000	9	TQEX
Genmab A/S	21/06/2024	3:41:33 PM	1,814.0000	2	TQEX
Genmab A/S	21/06/2024	3:41:33 PM	1,814.0000	2	TQEX
Genmab A/S	21/06/2024	3:41:33 PM	1,814.0000	10	TQEX
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	13	AQEU
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	16	AQEU
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	46	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	78	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	78	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	78	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	2	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	44	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	50	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	124	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	50	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	74	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	50	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	16	AQEU
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	77	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	28	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	11	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	12	XCSE
Genmab A/S	21/06/2024	3:41:40 PM	1,813.0000	26	XCSE
Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	6	AQEU

175

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	47	XCSE
Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	21	XCSE
Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	18	XCSE
Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	18	XCSE
Genmab A/S	21/06/2024	3:42:34 PM	1,810.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	38	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	45	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	53	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	46	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	7	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	38	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	2	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	48	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	1	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	8	XCSE
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	6	AQEU
Genmab A/S	21/06/2024	3:45:00 PM	1,811.0000	3	XCSE
Genmab A/S	21/06/2024	3:45:02 PM	1,810.5000	50	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,809.0000	5	AQEU
Genmab A/S	21/06/2024	3:47:04 PM	1,809.0000	40	AQEU
Genmab A/S	21/06/2024	3:47:04 PM	1,809.0000	37	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,809.0000	324	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,808.5000	52	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,808.5000	52	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,808.5000	314	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,807.5000	45	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,807.5000	5	AQEU
Genmab A/S	21/06/2024	3:47:04 PM	1,807.5000	45	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,807.5000	11	XCSE
Genmab A/S	21/06/2024	3:47:04 PM	1,807.5000	20	XCSE
Genmab A/S	21/06/2024	3:52:36 PM	1,809.0000	23	XCSE
Genmab A/S	21/06/2024	3:52:36 PM	1,809.0000	32	XCSE
Genmab A/S	21/06/2024	3:52:36 PM	1,809.0000	3	AQEU
Genmab A/S	21/06/2024	3:52:36 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	3:52:37 PM	1,809.0000	2	XCSE
Genmab A/S	21/06/2024	3:52:37 PM	1,809.0000	1	AQEU
Genmab A/S	21/06/2024	3:54:19 PM	1,809.5000	35	CEUX
Genmab A/S	21/06/2024	3:54:19 PM	1,809.0000	23	XCSE

176

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	3:54:45 PM	1,809.0000	2	AQEU
Genmab A/S	21/06/2024	3:54:45 PM	1,809.0000	2	AQEU
Genmab A/S	21/06/2024	3:54:45 PM	1,809.0000	23	XCSE
Genmab A/S	21/06/2024	3:54:45 PM	1,809.0000	94	XCSE
Genmab A/S	21/06/2024	3:55:19 PM	1,809.0000	12	AQEU
Genmab A/S	21/06/2024	3:55:24 PM	1,809.5000	7	AQEU
Genmab A/S	21/06/2024	3:55:31 PM	1,809.5000	35	CEUX
Genmab A/S	21/06/2024	3:55:50 PM	1,810.5000	3	CEUX
Genmab A/S	21/06/2024	3:55:50 PM	1,810.5000	12	CEUX
Genmab A/S	21/06/2024	3:55:58 PM	1,810.5000	39	CEUX
Genmab A/S	21/06/2024	3:55:58 PM	1,810.5000	43	XCSE
Genmab A/S	21/06/2024	3:55:58 PM	1,810.5000	39	XCSE
Genmab A/S	21/06/2024	3:55:58 PM	1,810.5000	41	XCSE
Genmab A/S	21/06/2024	3:56:04 PM	1,810.5000	25	XCSE
Genmab A/S	21/06/2024	3:56:04 PM	1,810.5000	13	XCSE
Genmab A/S	21/06/2024	3:56:04 PM	1,810.5000	12	XCSE
Genmab A/S	21/06/2024	3:56:04 PM	1,810.5000	5	XCSE
Genmab A/S	21/06/2024	3:56:04 PM	1,810.5000	12	XCSE
Genmab A/S	21/06/2024	3:56:04 PM	1,810.5000	47	XCSE
Genmab A/S	21/06/2024	3:56:35 PM	1,810.5000	15	XCSE
Genmab A/S	21/06/2024	3:56:35 PM	1,810.5000	49	XCSE
Genmab A/S	21/06/2024	3:57:42 PM	1,810.5000	36	XCSE
Genmab A/S	21/06/2024	3:58:03 PM	1,810.5000	3	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	123	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	89	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	13	TQEX
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	50	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	76	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	76	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	50	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	50	XCSE
Genmab A/S	21/06/2024	3:58:08 PM	1,810.5000	16	XCSE
Genmab A/S	21/06/2024	4:00:47 PM	1,810.0000	7	CEUX
Genmab A/S	21/06/2024	4:00:47 PM	1,810.0000	12	CEUX
Genmab A/S	21/06/2024	4:02:32 PM	1,809.0000	28	XCSE
Genmab A/S	21/06/2024	4:02:32 PM	1,809.0000	118	XCSE
Genmab A/S	21/06/2024	4:02:32 PM	1,809.0000	155	XCSE
Genmab A/S	21/06/2024	4:02:32 PM	1,809.0000	138	XCSE
Genmab A/S	21/06/2024	4:02:32 PM	1,809.0000	8	XCSE
Genmab A/S	21/06/2024	4:04:03 PM	1,810.0000	1	XCSE
Genmab A/S	21/06/2024	4:04:03 PM	1,810.0000	33	XCSE
Genmab A/S	21/06/2024	4:04:03 PM	1,810.0000	98	XCSE
Genmab A/S	21/06/2024	4:04:03 PM	1,810.0000	76	XCSE
Genmab A/S	21/06/2024	4:04:58 PM	1,811.0000	24	XCSE
Genmab A/S	21/06/2024	4:05:15 PM	1,811.5000	24	XCSE
Genmab A/S	21/06/2024	4:05:22 PM	1,811.5000	25	XCSE
Genmab A/S	21/06/2024	4:05:22 PM	1,811.5000	11	XCSE
Genmab A/S	21/06/2024	4:05:33 PM	1,811.5000	25	XCSE
Genmab A/S	21/06/2024	4:05:33 PM	1,811.5000	15	XCSE

177

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	8	AQEU
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	65	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	17	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	17	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	18	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	10	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	37	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	27	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	37	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	28	XCSE
Genmab A/S	21/06/2024	4:05:58 PM	1,811.0000	28	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	47	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	18	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	18	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	45	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	2	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	30	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	58	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	7	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	58	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	30	XCSE
Genmab A/S	21/06/2024	4:05:59 PM	1,811.0000	17	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,810.5000	31	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,810.5000	14	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,810.5000	34	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,811.0000	30	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,811.0000	35	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,810.5000	31	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,810.5000	14	XCSE
Genmab A/S	21/06/2024	4:06:00 PM	1,810.5000	45	XCSE
Genmab A/S	21/06/2024	4:06:01 PM	1,810.5000	45	XCSE
Genmab A/S	21/06/2024	4:06:01 PM	1,810.5000	11	XCSE
Genmab A/S	21/06/2024	4:06:01 PM	1,810.5000	38	XCSE
Genmab A/S	21/06/2024	4:10:20 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:10:20 PM	1,809.5000	50	XCSE
Genmab A/S	21/06/2024	4:10:23 PM	1,809.0000	37	XCSE
Genmab A/S	21/06/2024	4:10:57 PM	1,809.0000	5	XCSE
Genmab A/S	21/06/2024	4:11:03 PM	1,809.0000	5	AQEU
Genmab A/S	21/06/2024	4:11:10 PM	1,809.0000	30	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	2	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	5	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	20	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	7	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	5	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	27	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	9	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	28	XCSE
Genmab A/S	21/06/2024	4:11:12 PM	1,809.0000	37	XCSE
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	5	AQEU

178

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	2	AQEU
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	5	AQEU
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	2	AQEU
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	7	XCSE
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	5	AQEU
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	5	AQEU
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	5	AQEU
Genmab A/S	21/06/2024	4:11:13 PM	1,809.0000	10	XCSE
Genmab A/S	21/06/2024	4:11:30 PM	1,808.0000	1	XCSE
Genmab A/S	21/06/2024	4:11:30 PM	1,808.0000	36	XCSE
Genmab A/S	21/06/2024	4:11:30 PM	1,808.0000	37	XCSE
Genmab A/S	21/06/2024	4:11:30 PM	1,808.0000	17	XCSE
Genmab A/S	21/06/2024	4:12:29 PM	1,808.0000	12	AQEU
Genmab A/S	21/06/2024	4:12:29 PM	1,808.0000	88	XCSE
Genmab A/S	21/06/2024	4:12:29 PM	1,808.0000	12	AQEU
Genmab A/S	21/06/2024	4:12:29 PM	1,808.0000	6	AQEU
Genmab A/S	21/06/2024	4:12:53 PM	1,808.0000	39	XCSE
Genmab A/S	21/06/2024	4:12:53 PM	1,808.0000	150	XCSE
Genmab A/S	21/06/2024	4:12:53 PM	1,808.0000	163	XCSE
Genmab A/S	21/06/2024	4:12:53 PM	1,808.0000	44	AQEU
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	30	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	AQEU
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	AQEU
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	AQEU
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	AQEU
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	AQEU
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	30	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	6	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	2	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	3	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	5	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	2	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	7	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	5	XCSE
Genmab A/S	21/06/2024	4:13:54 PM	1,807.0000	8	XCSE
Genmab A/S	21/06/2024	4:13:58 PM	1,807.0000	34	XCSE
Genmab A/S	21/06/2024	4:13:58 PM	1,807.0000	34	XCSE
Genmab A/S	21/06/2024	4:13:58 PM	1,807.0000	5	AQEU
Genmab A/S	21/06/2024	4:13:58 PM	1,807.0000	8	XCSE
Genmab A/S	21/06/2024	4:14:59 PM	1,805.0000	5	AQEU
Genmab A/S	21/06/2024	4:16:51 PM	1,806.5000	4	AQEU
Genmab A/S	21/06/2024	4:16:51 PM	1,806.5000	5	XCSE
Genmab A/S	21/06/2024	4:16:51 PM	1,806.5000	20	XCSE
Genmab A/S	21/06/2024	4:16:51 PM	1,806.5000	25	XCSE
Genmab A/S	21/06/2024	4:16:51 PM	1,806.5000	24	XCSE

179

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:16:51 PM	1,806.5000	4	AQEU
Genmab A/S	21/06/2024	4:16:52 PM	1,806.5000	1	XCSE
Genmab A/S	21/06/2024	4:18:33 PM	1,807.5000	38	AQEU
Genmab A/S	21/06/2024	4:18:50 PM	1,807.5000	4	AQEU
Genmab A/S	21/06/2024	4:18:50 PM	1,807.5000	7	AQEU
Genmab A/S	21/06/2024	4:18:50 PM	1,807.5000	2	AQEU
Genmab A/S	21/06/2024	4:18:50 PM	1,807.5000	3	AQEU
Genmab A/S	21/06/2024	4:18:50 PM	1,807.5000	16	AQEU
Genmab A/S	21/06/2024	4:18:50 PM	1,807.5000	6	AQEU
Genmab A/S	21/06/2024	4:18:57 PM	1,807.5000	34	AQEU
Genmab A/S	21/06/2024	4:18:57 PM	1,807.5000	4	AQEU
Genmab A/S	21/06/2024	4:19:08 PM	1,807.5000	22	AQEU
Genmab A/S	21/06/2024	4:19:08 PM	1,807.5000	2	AQEU
Genmab A/S	21/06/2024	4:19:08 PM	1,807.5000	3	AQEU
Genmab A/S	21/06/2024	4:19:08 PM	1,807.5000	12	TQEX
Genmab A/S	21/06/2024	4:19:20 PM	1,807.5000	3	AQEU
Genmab A/S	21/06/2024	4:19:20 PM	1,807.5000	23	TQEX
Genmab A/S	21/06/2024	4:19:20 PM	1,807.5000	12	XCSE
Genmab A/S	21/06/2024	4:19:30 PM	1,807.5000	13	XCSE
Genmab A/S	21/06/2024	4:19:30 PM	1,807.5000	16	AQEU
Genmab A/S	21/06/2024	4:19:32 PM	1,807.0000	45	XCSE
Genmab A/S	21/06/2024	4:19:33 PM	1,807.0000	14	XCSE
Genmab A/S	21/06/2024	4:19:34 PM	1,807.0000	3	XCSE
Genmab A/S	21/06/2024	4:19:41 PM	1,807.0000	11	XCSE
Genmab A/S	21/06/2024	4:20:03 PM	1,807.5000	9	AQEU
Genmab A/S	21/06/2024	4:20:03 PM	1,807.5000	16	AQEU
Genmab A/S	21/06/2024	4:20:03 PM	1,807.5000	15	AQEU
Genmab A/S	21/06/2024	4:20:44 PM	1,808.5000	50	XCSE
Genmab A/S	21/06/2024	4:20:44 PM	1,808.5000	33	XCSE
Genmab A/S	21/06/2024	4:20:44 PM	1,808.5000	11	XCSE
Genmab A/S	21/06/2024	4:20:44 PM	1,808.5000	72	XCSE
Genmab A/S	21/06/2024	4:20:44 PM	1,808.5000	11	XCSE
Genmab A/S	21/06/2024	4:20:44 PM	1,808.5000	63	XCSE
Genmab A/S	21/06/2024	4:20:44 PM	1,808.5000	20	XCSE
Genmab A/S	21/06/2024	4:21:35 PM	1,808.5000	28	XCSE
Genmab A/S	21/06/2024	4:21:35 PM	1,808.5000	12	XCSE
Genmab A/S	21/06/2024	4:21:44 PM	1,808.5000	35	XCSE
Genmab A/S	21/06/2024	4:21:54 PM	1,808.5000	34	XCSE
Genmab A/S	21/06/2024	4:22:05 PM	1,808.5000	7	XCSE
Genmab A/S	21/06/2024	4:22:05 PM	1,808.5000	27	XCSE
Genmab A/S	21/06/2024	4:22:17 PM	1,808.5000	10	XCSE
Genmab A/S	21/06/2024	4:22:17 PM	1,808.5000	11	XCSE
Genmab A/S	21/06/2024	4:22:17 PM	1,808.5000	19	XCSE
Genmab A/S	21/06/2024	4:22:35 PM	1,808.5000	10	TQEX
Genmab A/S	21/06/2024	4:22:39 PM	1,808.5000	3	TQEX
Genmab A/S	21/06/2024	4:22:39 PM	1,808.5000	2	TQEX
Genmab A/S	21/06/2024	4:22:39 PM	1,808.5000	13	XCSE
Genmab A/S	21/06/2024	4:22:39 PM	1,808.5000	12	XCSE
Genmab A/S	21/06/2024	4:22:39 PM	1,808.5000	2	TQEX

180

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:22:44 PM	1,808.5000	12	XCSE
Genmab A/S	21/06/2024	4:22:53 PM	1,808.0000	21	XCSE
Genmab A/S	21/06/2024	4:22:53 PM	1,808.0000	22	XCSE
Genmab A/S	21/06/2024	4:22:53 PM	1,808.0000	21	XCSE
Genmab A/S	21/06/2024	4:22:53 PM	1,808.0000	22	XCSE
Genmab A/S	21/06/2024	4:22:54 PM	1,808.0000	21	XCSE
Genmab A/S	21/06/2024	4:22:54 PM	1,808.0000	11	XCSE
Genmab A/S	21/06/2024	4:22:54 PM	1,808.0000	11	XCSE
Genmab A/S	21/06/2024	4:22:54 PM	1,808.0000	21	XCSE
Genmab A/S	21/06/2024	4:22:56 PM	1,808.0000	21	XCSE
Genmab A/S	21/06/2024	4:23:36 PM	1,808.5000	23	TQEX
Genmab A/S	21/06/2024	4:23:36 PM	1,808.5000	15	TQEX
Genmab A/S	21/06/2024	4:23:47 PM	1,808.5000	29	TQEX
Genmab A/S	21/06/2024	4:23:47 PM	1,808.5000	1	TQEX
Genmab A/S	21/06/2024	4:24:14 PM	1,807.5000	187	XCSE
Genmab A/S	21/06/2024	4:24:51 PM	1,808.5000	30	XCSE
Genmab A/S	21/06/2024	4:24:51 PM	1,808.5000	7	XCSE
Genmab A/S	21/06/2024	4:25:05 PM	1,808.5000	30	XCSE
Genmab A/S	21/06/2024	4:25:05 PM	1,808.5000	11	XCSE
Genmab A/S	21/06/2024	4:25:14 PM	1,808.5000	31	XCSE
Genmab A/S	21/06/2024	4:25:14 PM	1,808.5000	4	XCSE
Genmab A/S	21/06/2024	4:25:27 PM	1,808.5000	25	XCSE
Genmab A/S	21/06/2024	4:25:27 PM	1,808.5000	8	XCSE
Genmab A/S	21/06/2024	4:25:36 PM	1,808.5000	8	AQEU
Genmab A/S	21/06/2024	4:25:36 PM	1,808.5000	11	XCSE
Genmab A/S	21/06/2024	4:25:45 PM	1,808.5000	2	AQEU
Genmab A/S	21/06/2024	4:25:45 PM	1,808.5000	16	AQEU
Genmab A/S	21/06/2024	4:25:45 PM	1,808.5000	16	AQEU
Genmab A/S	21/06/2024	4:25:45 PM	1,808.5000	2	AQEU
Genmab A/S	21/06/2024	4:25:55 PM	1,808.0000	150	XCSE
Genmab A/S	21/06/2024	4:25:55 PM	1,808.5000	2	AQEU
Genmab A/S	21/06/2024	4:25:55 PM	1,808.5000	16	AQEU
Genmab A/S	21/06/2024	4:25:55 PM	1,808.5000	3	AQEU
Genmab A/S	21/06/2024	4:25:55 PM	1,808.0000	28	XCSE
Genmab A/S	21/06/2024	4:27:28 PM	1,808.5000	40	AQEU
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	97	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	127	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	6	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	6	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	91	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	6	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	50	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	97	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	97	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	28	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	17	AQEU
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	17	AQEU
Genmab A/S	21/06/2024	4:28:17 PM	1,808.0000	10	AQEU
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	47	XCSE

181

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	5	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	49	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	26	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	25	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	27	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	27	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	22	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	50	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	2	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	49	XCSE
Genmab A/S	21/06/2024	4:28:17 PM	1,807.5000	28	XCSE
Genmab A/S	21/06/2024	4:30:17 PM	1,806.0000	49	XCSE
Genmab A/S	21/06/2024	4:30:18 PM	1,806.0000	38	XCSE
Genmab A/S	21/06/2024	4:30:19 PM	1,806.0000	8	XCSE
Genmab A/S	21/06/2024	4:30:19 PM	1,806.0000	3	XCSE
Genmab A/S	21/06/2024	4:30:28 PM	1,806.0000	41	XCSE
Genmab A/S	21/06/2024	4:32:49 PM	1,806.5000	16	AQEU
Genmab A/S	21/06/2024	4:33:04 PM	1,806.5000	2	AQEU
Genmab A/S	21/06/2024	4:33:04 PM	1,806.5000	12	AQEU
Genmab A/S	21/06/2024	4:33:30 PM	1,807.0000	5	XCSE
Genmab A/S	21/06/2024	4:34:18 PM	1,806.5000	9	XCSE
Genmab A/S	21/06/2024	4:34:18 PM	1,806.5000	172	XCSE
Genmab A/S	21/06/2024	4:34:18 PM	1,806.5000	181	XCSE
Genmab A/S	21/06/2024	4:34:18 PM	1,806.5000	38	XCSE
Genmab A/S	21/06/2024	4:35:01 PM	1,807.0000	16	AQEU
Genmab A/S	21/06/2024	4:35:01 PM	1,807.0000	14	AQEU
Genmab A/S	21/06/2024	4:35:01 PM	1,807.0000	5	XCSE
Genmab A/S	21/06/2024	4:35:07 PM	1,807.0000	26	XCSE
Genmab A/S	21/06/2024	4:35:07 PM	1,807.0000	9	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.5000	181	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.5000	296	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.5000	27	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.5000	20	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.5000	6	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.5000	14	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.5000	29	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	4	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	50	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	22	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	50	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	50	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	6	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	50	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	50	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	50	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	14	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	11	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,806.0000	28	XCSE
Genmab A/S	21/06/2024	4:35:21 PM	1,805.5000	20	XCSE

182

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:35:22 PM	1,805.5000	11	XCSE
Genmab A/S	21/06/2024	4:35:22 PM	1,805.5000	11	XCSE
Genmab A/S	21/06/2024	4:39:20 PM	1,808.0000	104	XCSE
Genmab A/S	21/06/2024	4:39:20 PM	1,808.0000	114	XCSE
Genmab A/S	21/06/2024	4:39:20 PM	1,808.0000	100	XCSE
Genmab A/S	21/06/2024	4:39:20 PM	1,808.0000	4	XCSE
Genmab A/S	21/06/2024	4:39:20 PM	1,808.0000	79	XCSE
Genmab A/S	21/06/2024	4:39:20 PM	1,808.0000	25	XCSE
Genmab A/S	21/06/2024	4:39:20 PM	1,808.0000	27	XCSE
Genmab A/S	21/06/2024	4:41:45 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:45 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:45 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:45 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:45 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:45 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	12	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	9	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	13	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	8	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	19	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	2	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	60	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:41:46 PM	1,809.0000	61	XCSE
Genmab A/S	21/06/2024	4:41:47 PM	1,809.0000	17	XCSE
Genmab A/S	21/06/2024	4:41:48 PM	1,809.0000	4	XCSE
Genmab A/S	21/06/2024	4:41:48 PM	1,809.0000	21	XCSE
Genmab A/S	21/06/2024	4:42:02 PM	1,808.0000	47	XCSE
Genmab A/S	21/06/2024	4:43:23 PM	1,808.5000	40	XCSE
Genmab A/S	21/06/2024	4:43:23 PM	1,808.5000	150	XCSE
Genmab A/S	21/06/2024	4:43:23 PM	1,808.5000	100	XCSE
Genmab A/S	21/06/2024	4:43:23 PM	1,808.5000	48	XCSE
Genmab A/S	21/06/2024	4:43:23 PM	1,808.5000	13	XCSE
Genmab A/S	21/06/2024	4:43:23 PM	1,808.5000	50	XCSE
Genmab A/S	21/06/2024	4:43:23 PM	1,808.5000	42	XCSE
Genmab A/S	21/06/2024	4:45:10 PM	1,808.5000	108	XCSE
Genmab A/S	21/06/2024	4:45:10 PM	1,808.5000	91	XCSE
Genmab A/S	21/06/2024	4:45:10 PM	1,808.5000	17	XCSE
Genmab A/S	21/06/2024	4:45:10 PM	1,808.5000	16	XCSE
Genmab A/S	21/06/2024	4:46:26 PM	1,808.5000	22	XCSE
Genmab A/S	21/06/2024	4:46:27 PM	1,808.5000	9	XCSE
Genmab A/S	21/06/2024	4:46:27 PM	1,808.5000	7	XCSE
Genmab A/S	21/06/2024	4:47:09 PM	1,809.0000	3	AQEU
Genmab A/S	21/06/2024	4:47:14 PM	1,809.0000	3	AQEU
Genmab A/S	21/06/2024	4:47:28 PM	1,808.5000	152	XCSE
Genmab A/S	21/06/2024	4:47:28 PM	1,808.5000	37	XCSE
Genmab A/S	21/06/2024	4:47:28 PM	1,808.5000	61	XCSE
Genmab A/S	21/06/2024	4:47:28 PM	1,808.5000	40	XCSE

183

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:47:29 PM	1,808.5000	149	XCSE
Genmab A/S	21/06/2024	4:48:14 PM	1,809.0000	20	AQEU
Genmab A/S	21/06/2024	4:49:46 PM	1,809.0000	33	XCSE
Genmab A/S	21/06/2024	4:49:46 PM	1,809.0000	1	XCSE
Genmab A/S	21/06/2024	4:49:46 PM	1,809.0000	16	XCSE
Genmab A/S	21/06/2024	4:49:47 PM	1,809.0000	13	XCSE
Genmab A/S	21/06/2024	4:49:47 PM	1,809.0000	61	XCSE
Genmab A/S	21/06/2024	4:49:55 PM	1,808.5000	100	XCSE
Genmab A/S	21/06/2024	4:49:56 PM	1,808.5000	89	XCSE
Genmab A/S	21/06/2024	4:49:56 PM	1,808.5000	103	XCSE
Genmab A/S	21/06/2024	4:49:56 PM	1,808.5000	192	XCSE
Genmab A/S	21/06/2024	4:49:56 PM	1,808.5000	189	XCSE
Genmab A/S	21/06/2024	4:49:56 PM	1,808.5000	57	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	24	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	105	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	23	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	24	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	22	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	24	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	119	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	22	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	24	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	22	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	350	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	343	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	22	XCSE
Genmab A/S	21/06/2024	4:50:57 PM	1,808.5000	14	XCSE
Genmab A/S	21/06/2024	4:51:30 PM	1,809.5000	81	XCSE
Genmab A/S	21/06/2024	4:51:30 PM	1,809.5000	39	XCSE
Genmab A/S	21/06/2024	4:52:03 PM	1,809.5000	1	XCSE
Genmab A/S	21/06/2024	4:52:21 PM	1,809.5000	2	XCSE
Genmab A/S	21/06/2024	4:54:00 PM	1,810.0000	5	AQEU
Genmab A/S	21/06/2024	4:54:08 PM	1,809.5000	72	XCSE
Genmab A/S	21/06/2024	4:54:08 PM	1,810.0000	40	AQEU
Genmab A/S	21/06/2024	4:54:15 PM	1,809.5000	61	XCSE
Genmab A/S	21/06/2024	4:54:15 PM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	4:54:15 PM	1,809.5000	10	XCSE
Genmab A/S	21/06/2024	4:54:16 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:54:16 PM	1,809.5000	61	XCSE
Genmab A/S	21/06/2024	4:54:18 PM	1,809.5000	39	XCSE
Genmab A/S	21/06/2024	4:54:20 PM	1,809.5000	46	XCSE
Genmab A/S	21/06/2024	4:54:20 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:54:20 PM	1,809.5000	12	XCSE
Genmab A/S	21/06/2024	4:54:23 PM	1,809.5000	15	XCSE
Genmab A/S	21/06/2024	4:54:24 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:54:25 PM	1,809.5000	12	XCSE
Genmab A/S	21/06/2024	4:54:26 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:54:26 PM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	4:54:27 PM	1,809.5000	12	XCSE

184

Exhibit 99.1(a)

APPENDIX Sharebuy-backprogramme-SpecificationforJune 17 – June 21, 2024

Genmab A/S	21/06/2024	4:54:28 PM	1,809.5000	12	XCSE
Genmab A/S	21/06/2024	4:54:28 PM	1,809.5000	7	XCSE
Genmab A/S	21/06/2024	4:54:30 PM	1,809.5000	3	XCSE
Genmab A/S	21/06/2024	4:54:30 PM	1,809.5000	1	XCSE
Genmab A/S	21/06/2024	4:54:30 PM	1,809.5000	8	XCSE
Genmab A/S	21/06/2024	4:54:30 PM	1,809.5000	15	XCSE
Genmab A/S	21/06/2024	4:54:32 PM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	4:54:33 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:54:39 PM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	4:54:39 PM	1,809.5000	61	XCSE
Genmab A/S	21/06/2024	4:54:39 PM	1,809.5000	25	XCSE
Genmab A/S	21/06/2024	4:54:40 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:54:43 PM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	4:54:43 PM	1,809.5000	25	XCSE
Genmab A/S	21/06/2024	4:54:46 PM	1,809.5000	25	XCSE
Genmab A/S	21/06/2024	4:54:46 PM	1,809.5000	11	XCSE
Genmab A/S	21/06/2024	4:54:46 PM	1,809.5000	25	XCSE
Genmab A/S	21/06/2024	4:54:46 PM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	4:54:46 PM	1,809.5000	38	XCSE
Genmab A/S	21/06/2024	4:54:50 PM	1,809.5000	13	XCSE
Genmab A/S	21/06/2024	4:54:50 PM	1,809.5000	25	XCSE
Genmab A/S	21/06/2024	4:54:52 PM	1,809.5000	2	AQEU
Genmab A/S	21/06/2024	4:54:52 PM	1,809.5000	3	AQEU
Genmab A/S	21/06/2024	4:54:53 PM	1,809.0000	18	XCSE

185