0001558370-25-005115.txt : 20250422 0001558370-25-005115.hdr.sgml : 20250422 20250422085619 ACCESSION NUMBER: 0001558370-25-005115 CONFORMED SUBMISSION TYPE: 6-K PUBLIC DOCUMENT COUNT: 5 CONFORMED PERIOD OF REPORT: 20250422 FILED AS OF DATE: 20250422 DATE AS OF CHANGE: 20250422 FILER: COMPANY DATA: COMPANY CONFORMED NAME: GENMAB A/S CENTRAL INDEX KEY: 0001434265 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences EIN: 000000000 FILING VALUES: FORM TYPE: 6-K SEC ACT: 1934 Act SEC FILE NUMBER: 001-38976 FILM NUMBER: 25855656 BUSINESS ADDRESS: STREET 1: TOLDBODGADE 33 CITY: 1253 COPENHAGEN K STATE: G7 ZIP: 00000 MAIL ADDRESS: STREET 1: TOLDBODGADE 33 CITY: 1253 COPENHAGEN K STATE: G7 ZIP: 00000 6-K 1 gmab-20250422x6k.htm 6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



FORM 6-K


REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE MONTH OF APRIL 2025


COMMISSION FILE NUMBER 001-38976

Genmab A/S
(Exact name of Registrant as specified in its charter)

Carl Jacobsens Vej 30

2500 Valby

Denmark

+45 70 20 27 28
(Address of principal executive offices)


Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F  Form 40-F 

This report on Form 6-K shall be deemed to be incorporated by reference in Genmab A/S’s registration statements on Form S-8 (File No. 333-232693, 333-253519, 333-262970, 333-277273 and 333-284876) and to be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.


SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

nthony

GENMAB A/S

BY:

/s/ Anthony Pagano

Name: Anthony Pagano

Title: Executive Vice President & Chief Financial Officer

DATE: APRIL 22, 2025


EXHIBIT INDEX

O

Exhibit

Description of Exhibit

99.1

Company Announcement Dated April 22, 2025: Transactions in Connection with Share Buy-back Program

99.1(a)

Appendix Share buyback program – Specification for April 14 – April 18, 2025


EX-99.1 2 gmab-20250422xex99d1.htm EX-99.1

Exhibit 99.1

Graphic

Transactions in Connection with Share Buy-back Program

Company Announcement

COPENHAGEN, Denmark; April 22, 2025 – Genmab A/S (Nasdaq: GMAB). On March 25, 2025, Genmab announced the initiation of a share buy-back program to repurchase up to 2.2 million shares to reduce capital and to honor our commitments under the Restricted Stock Unit program. The share buy-back program is expected to be completed no later than July 10, 2025.

The following transactions were executed under the program from April 14 to April 18, 2025:

Trading Platform

No. of shares

Average price (DKK)

Total value (DKK)

Accumulated through last announcement

1,083,902

1,393,911,230.61

April 14, 2025

XCSE

52,871

1,269.11

67,099,100.80

BCXE

26,940

1,269.12

34,190,092.80

AQEU

4,700

1,268.67

5,962,749.00

TQEX

5,000

1,268.47

6,342,350.00

Total

89,511

113,594,292.60

April 15, 2025

XCSE

53,900

1,295.52

69,828,654.08

BCXE

28,000

1,295.71

36,279,880.00

AQEU

5,000

1,295.84,

6,479,200.00

TQEX

5,000

1,295.64

6,478,200.00

Total

91,900

119,065,934.08

April 16, 2025

XCSE

51,381

1,285.93

66,072,139.12

BCXE

28,319

1,285.46

36,402,802.98

AQEU

5,100

1,285.89

6,558,049.20

TQEX

5,418

1,285.64

6,965,574.22

Total

90,218

115,998,569.37

April 17, 2025

XCSE

BCXE

AQEU

TQEX

Total

April 18, 2025

XCSE

BCXE

AQEU

TQEX

Total

Total

271,629

348,658,796.05

Accumulated under the program 

1,355,531

1,742,570,026.66

Details of each transaction are included as an appendix to this announcement.

Genmab A/S

Tel: +45 7020 2728

Company Announcement no. 21

Carl Jacobsens Vej 30

Fax: +45 7020 2729

Page 1/2

2500 Valby, Denmark

www.genmab.com

CVR no. 2102 3884

LEI Code 529900MTJPDPE4MHJ122


Graphic

Transactions in Connection with Share Buy-back Program

Following these transactions, Genmab holds 1,808,284 shares as treasury shares, corresponding to 2.82% of the total share capital and voting rights.

The share buy-back program is undertaken in accordance with Regulation (EU) No. 596/2014 (‘MAR’) and the Commission Delegated Regulation (EU) 2016/1052, also referred to as the “Safe Harbour Regulation.” Further details on the terms of the share buy-back program can be found in our company announcement no. 14 dated March 25, 2025.

About Genmab

Genmab is an international biotechnology company with a core purpose of guiding its unstoppable team to strive toward improving the lives of patients with innovative and differentiated antibody therapeutics. For more than 25 years, its passionate, innovative and collaborative team has invented next-generation antibody technology platforms and leveraged translational, quantitative and data sciences, resulting in a proprietary pipeline including bispecific T-cell engagers, antibody-drug conjugates, next-generation immune checkpoint modulators and effector function-enhanced antibodies. By 2030, Genmab’s vision is to transform the lives of people with cancer and other serious diseases with knock-your-socks-off (KYSO) antibody medicines®. 

 

Established in 1999, Genmab is headquartered in Copenhagen, Denmark, with international presence across North America, Europe and Asia Pacific. For more information, please visit Genmab.com and follow us on LinkedIn and X.

Contact:
Marisol Peron, Senior Vice President, Global Communications & Corporate Affairs

T: +1 609 524 0065; E: mmp@genmab.com

Andrew Carlsen, Vice President, Head of Investor Relations

T: +45 3377 9558; E: acn@genmab.com


This Company Announcement contains forward looking statements. The words “believe,” “expect,” “anticipate,” “intend” and “plan” and similar expressions identify forward looking statements. Actual results or performance may differ materially from any future results or performance expressed or implied by such statements. The important factors that could cause our actual results or performance to differ materially include, among others, risks associated with pre-clinical and clinical development of products, uncertainties related to the outcome and conduct of clinical trials including unforeseen safety issues, uncertainties related to product manufacturing, the lack of market acceptance of our products, our inability to manage growth, the competitive environment in relation to our business area and markets, our inability to attract and retain suitably qualified personnel, the unenforceability or lack of protection of our patents and proprietary rights, our relationships with affiliated entities, changes and developments in technology which may render our products or technologies obsolete, and other factors. For a further discussion of these risks, please refer to the risk management sections in Genmab’s most recent financial reports, which are available on www.genmab.com and the risk factors included in Genmab’s most recent Annual Report on Form 20-F and other filings with the U.S. Securities and Exchange Commission (SEC), which are available at www.sec.gov. Genmab does not undertake any obligation to update or revise forward looking statements in this Company Announcement nor to confirm such statements to reflect subsequent events or circumstances after the date made or in relation to actual results, unless required by law.


Genmab A/S and/or its subsidiaries own the following trademarks: Genmab®; the Y-shaped Genmab logo®; Genmab in combination with the Y-shaped Genmab logo®; HuMax®; DuoBody®; HexaBody®; DuoHexaBody®, HexElect® and KYSO®.

Genmab A/S

Tel: +45 7020 2728

Company Announcement no. 21

Carl Jacobsens Vej 30

Fax: +45 7020 2729

Page 2/2

2500 Valby, Denmark

www.genmab.com

CVR no. 2102 3884

LEI Code 529900MTJPDPE4MHJ122


EX-99.1(A) 3 gmab-20250422xex99d1a.htm EX-99.1(A)

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

Issuer

Date

Time CET

Quantity

Price (DKK)

Venue

GENMAB A/S

14-Apr-2025

9:55:18 AM

78

1259.50

XCSE

GENMAB A/S

14-Apr-2025

9:55:30 AM

82

1259.00

CEUX

GENMAB A/S

14-Apr-2025

9:55:32 AM

86

1258.50

XCSE

GENMAB A/S

14-Apr-2025

9:56:01 AM

76

1258.00

TQEX

GENMAB A/S

14-Apr-2025

9:56:14 AM

74

1258.00

AQEU

GENMAB A/S

14-Apr-2025

9:56:31 AM

84

1257.50

XCSE

GENMAB A/S

14-Apr-2025

9:56:31 AM

77

1257.50

CEUX

GENMAB A/S

14-Apr-2025

9:56:32 AM

76

1257.00

TQEX

GENMAB A/S

14-Apr-2025

9:56:32 AM

77

1256.50

CEUX

GENMAB A/S

14-Apr-2025

9:56:32 AM

3

1256.50

CEUX

GENMAB A/S

14-Apr-2025

9:56:32 AM

87

1257.00

AQEU

GENMAB A/S

14-Apr-2025

9:56:33 AM

38

1256.00

XCSE

GENMAB A/S

14-Apr-2025

9:56:33 AM

81

1256.00

TQEX

GENMAB A/S

14-Apr-2025

9:56:33 AM

83

1256.00

AQEU

GENMAB A/S

14-Apr-2025

10:00:33 AM

22

1258.00

XCSE

GENMAB A/S

14-Apr-2025

10:00:33 AM

53

1258.00

XCSE

GENMAB A/S

14-Apr-2025

10:00:33 AM

12

1258.00

XCSE

GENMAB A/S

14-Apr-2025

10:00:33 AM

25

1258.00

CEUX

GENMAB A/S

14-Apr-2025

10:00:58 AM

18

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:02:01 AM

85

1261.00

XCSE

GENMAB A/S

14-Apr-2025

10:02:01 AM

31

1261.00

TQEX

GENMAB A/S

14-Apr-2025

10:02:01 AM

15

1261.00

CEUX

GENMAB A/S

14-Apr-2025

10:02:01 AM

32

1261.00

CEUX

GENMAB A/S

14-Apr-2025

10:04:31 AM

52

1261.00

CEUX

GENMAB A/S

14-Apr-2025

10:04:39 AM

31

1260.50

XCSE

GENMAB A/S

14-Apr-2025

10:04:39 AM

53

1260.50

XCSE

GENMAB A/S

14-Apr-2025

10:04:39 AM

25

1260.50

TQEX

GENMAB A/S

14-Apr-2025

10:04:39 AM

8

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:04:39 AM

5

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:04:39 AM

7

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:06:13 AM

60

1261.00

CEUX

GENMAB A/S

14-Apr-2025

10:06:45 AM

88

1260.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

83

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

3

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

16

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

8

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

13

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

5

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

5

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

15

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:09:28 AM

8

1259.50

XCSE

1


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

10:09:28 AM

30

1260.00

TQEX

GENMAB A/S

14-Apr-2025

10:09:28 AM

2

1259.00

TQEX

GENMAB A/S

14-Apr-2025

10:09:28 AM

5

1259.00

TQEX

GENMAB A/S

14-Apr-2025

10:09:28 AM

2

1259.00

TQEX

GENMAB A/S

14-Apr-2025

10:09:28 AM

7

1259.00

TQEX

GENMAB A/S

14-Apr-2025

10:09:28 AM

2

1259.00

TQEX

GENMAB A/S

14-Apr-2025

10:09:28 AM

6

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:09:28 AM

8

1259.00

CEUX

GENMAB A/S

14-Apr-2025

10:09:28 AM

2

1259.00

CEUX

GENMAB A/S

14-Apr-2025

10:09:28 AM

7

1259.00

CEUX

GENMAB A/S

14-Apr-2025

10:09:47 AM

39

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:09:56 AM

11

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:09:56 AM

10

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:09:56 AM

39

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:10:03 AM

39

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:10:30 AM

19

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:10:30 AM

39

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:10:58 AM

82

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:10:58 AM

50

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:10:58 AM

59

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:10:58 AM

3

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:10:58 AM

14

1259.00

CEUX

GENMAB A/S

14-Apr-2025

10:10:58 AM

29

1259.50

AQEU

GENMAB A/S

14-Apr-2025

10:11:00 AM

75

1258.50

XCSE

GENMAB A/S

14-Apr-2025

10:11:00 AM

13

1258.50

TQEX

GENMAB A/S

14-Apr-2025

10:11:00 AM

17

1258.50

TQEX

GENMAB A/S

14-Apr-2025

10:11:58 AM

9

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:11:58 AM

74

1259.50

XCSE

GENMAB A/S

14-Apr-2025

10:11:58 AM

84

1259.50

CEUX

GENMAB A/S

14-Apr-2025

10:12:17 AM

38

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:13:21 AM

21

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:13:21 AM

5

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:13:21 AM

48

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:13:21 AM

64

1260.00

XCSE

GENMAB A/S

14-Apr-2025

10:13:21 AM

27

1259.50

TQEX

GENMAB A/S

14-Apr-2025

10:13:21 AM

16

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:13:21 AM

11

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:13:21 AM

3

1260.00

CEUX

GENMAB A/S

14-Apr-2025

10:13:21 AM

24

1259.50

CEUX

GENMAB A/S

14-Apr-2025

10:13:21 AM

5

1259.50

CEUX

GENMAB A/S

14-Apr-2025

10:13:21 AM

10

1259.50

CEUX

GENMAB A/S

14-Apr-2025

10:13:21 AM

18

1259.50

CEUX

GENMAB A/S

14-Apr-2025

10:13:22 AM

76

1260.00

XCSE

2


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

10:14:37 AM

6

1263.00

XCSE

GENMAB A/S

14-Apr-2025

10:14:48 AM

47

1263.50

XCSE

GENMAB A/S

14-Apr-2025

10:14:58 AM

84

1263.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:05 AM

84

1263.00

XCSE

GENMAB A/S

14-Apr-2025

10:15:05 AM

24

1263.50

XCSE

GENMAB A/S

14-Apr-2025

10:15:05 AM

39

1263.50

XCSE

GENMAB A/S

14-Apr-2025

10:15:05 AM

36

1263.50

XCSE

GENMAB A/S

14-Apr-2025

10:15:05 AM

42

1263.00

XCSE

GENMAB A/S

14-Apr-2025

10:15:05 AM

32

1263.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:05 AM

28

1263.00

AQEU

GENMAB A/S

14-Apr-2025

10:15:22 AM

87

1263.00

XCSE

GENMAB A/S

14-Apr-2025

10:15:22 AM

6

1263.00

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

9

1263.00

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

5

1263.00

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

5

1263.00

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

2

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

1

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

25

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

3

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

7

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

8

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

9

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

5

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:22 AM

3

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:15:23 AM

20

1262.50

CEUX

GENMAB A/S

14-Apr-2025

10:19:02 AM

41

1265.50

XCSE

GENMAB A/S

14-Apr-2025

10:19:08 AM

41

1265.50

XCSE

GENMAB A/S

14-Apr-2025

10:21:37 AM

20

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:40 AM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:40 AM

13

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:43 AM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:43 AM

21

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:43 AM

14

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:56 AM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:56 AM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:58 AM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:58 AM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:21:58 AM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:22:39 AM

11

1264.50

XCSE

GENMAB A/S

14-Apr-2025

10:22:39 AM

32

1265.00

TQEX

GENMAB A/S

14-Apr-2025

10:22:39 AM

49

1265.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:28 AM

12

1265.00

TQEX

GENMAB A/S

14-Apr-2025

10:23:28 AM

23

1265.00

TQEX

3


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

10:23:30 AM

36

1265.00

CEUX

GENMAB A/S

14-Apr-2025

10:23:30 AM

36

1265.00

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

46

1264.50

XCSE

GENMAB A/S

14-Apr-2025

10:23:38 AM

3

1264.50

XCSE

GENMAB A/S

14-Apr-2025

10:23:38 AM

29

1264.50

XCSE

GENMAB A/S

14-Apr-2025

10:23:38 AM

8

1264.00

XCSE

GENMAB A/S

14-Apr-2025

10:23:38 AM

5

1264.00

TQEX

GENMAB A/S

14-Apr-2025

10:23:38 AM

13

1264.00

TQEX

GENMAB A/S

14-Apr-2025

10:23:38 AM

9

1264.00

TQEX

GENMAB A/S

14-Apr-2025

10:23:38 AM

6

1264.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

3

1264.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

34

1264.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

44

1264.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

26

1264.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

9

1263.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

2

1263.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

3

1263.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

4

1263.50

CEUX

GENMAB A/S

14-Apr-2025

10:23:38 AM

43

1264.50

AQEU

GENMAB A/S

14-Apr-2025

10:24:37 AM

86

1264.50

CEUX

GENMAB A/S

14-Apr-2025

10:26:23 AM

76

1264.50

CEUX

GENMAB A/S

14-Apr-2025

10:26:29 AM

71

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:26:43 AM

24

1265.00

AQEU

GENMAB A/S

14-Apr-2025

10:28:29 AM

12

1265.00

XCSE

GENMAB A/S

14-Apr-2025

10:29:42 AM

36

1267.50

XCSE

GENMAB A/S

14-Apr-2025

10:29:43 AM

36

1267.50

XCSE

GENMAB A/S

14-Apr-2025

10:29:43 AM

5

1267.50

XCSE

GENMAB A/S

14-Apr-2025

10:30:37 AM

91

1268.00

XCSE

GENMAB A/S

14-Apr-2025

10:30:37 AM

21

1268.00

XCSE

GENMAB A/S

14-Apr-2025

10:30:38 AM

90

1268.00

XCSE

GENMAB A/S

14-Apr-2025

10:30:38 AM

22

1268.00

XCSE

GENMAB A/S

14-Apr-2025

10:30:38 AM

91

1268.00

XCSE

GENMAB A/S

14-Apr-2025

10:30:38 AM

21

1268.00

XCSE

GENMAB A/S

14-Apr-2025

10:30:47 AM

48

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:30:47 AM

32

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:30:47 AM

32

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:30:47 AM

4

1269.00

CEUX

GENMAB A/S

14-Apr-2025

10:30:48 AM

31

1269.50

CEUX

GENMAB A/S

14-Apr-2025

10:30:50 AM

112

1270.00

XCSE

GENMAB A/S

14-Apr-2025

10:31:14 AM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

10:31:36 AM

34

1272.00

XCSE

GENMAB A/S

14-Apr-2025

10:32:02 AM

45

1272.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:02 AM

41

1272.50

CEUX

4


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

10:32:03 AM

82

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:03 AM

31

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:03 AM

19

1272.50

TQEX

GENMAB A/S

14-Apr-2025

10:32:03 AM

7

1272.50

TQEX

GENMAB A/S

14-Apr-2025

10:32:03 AM

40

1273.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:03 AM

12

1273.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:03 AM

42

1272.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:03 AM

40

1272.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:03 AM

38

1273.00

AQEU

GENMAB A/S

14-Apr-2025

10:32:04 AM

47

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:04 AM

31

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:04 AM

34

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:04 AM

31

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:04 AM

32

1272.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:17 AM

31

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:17 AM

32

1272.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:18 AM

4

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:30 AM

89

1272.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:30 AM

39

1273.00

XCSE

GENMAB A/S

14-Apr-2025

10:32:30 AM

16

1273.00

XCSE

GENMAB A/S

14-Apr-2025

10:32:30 AM

30

1272.50

TQEX

GENMAB A/S

14-Apr-2025

10:32:30 AM

83

1272.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:30 AM

11

1272.50

AQEU

GENMAB A/S

14-Apr-2025

10:32:30 AM

32

1272.50

AQEU

GENMAB A/S

14-Apr-2025

10:32:39 AM

84

1271.50

XCSE

GENMAB A/S

14-Apr-2025

10:32:39 AM

27

1271.50

TQEX

GENMAB A/S

14-Apr-2025

10:32:39 AM

28

1271.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:39 AM

35

1271.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:39 AM

26

1271.50

CEUX

GENMAB A/S

14-Apr-2025

10:32:39 AM

28

1271.50

AQEU

GENMAB A/S

14-Apr-2025

10:33:08 AM

83

1270.50

XCSE

GENMAB A/S

14-Apr-2025

10:33:08 AM

8

1270.50

CEUX

GENMAB A/S

14-Apr-2025

10:33:09 AM

78

1270.50

CEUX

GENMAB A/S

14-Apr-2025

10:33:26 AM

25

1270.00

AQEU

GENMAB A/S

14-Apr-2025

10:33:55 AM

82

1269.00

XCSE

GENMAB A/S

14-Apr-2025

10:34:14 AM

85

1269.00

CEUX

GENMAB A/S

14-Apr-2025

10:34:32 AM

7

1268.00

CEUX

GENMAB A/S

14-Apr-2025

10:37:22 AM

22

1270.00

XCSE

GENMAB A/S

14-Apr-2025

10:37:22 AM

90

1270.00

XCSE

GENMAB A/S

14-Apr-2025

10:37:23 AM

12

1270.00

CEUX

GENMAB A/S

14-Apr-2025

10:37:23 AM

24

1270.00

CEUX

GENMAB A/S

14-Apr-2025

10:37:24 AM

32

1270.00

CEUX

GENMAB A/S

14-Apr-2025

10:37:24 AM

12

1270.00

CEUX

5


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

10:37:24 AM

3

1270.00

CEUX

GENMAB A/S

14-Apr-2025

10:37:40 AM

22

1270.00

XCSE

GENMAB A/S

14-Apr-2025

10:37:40 AM

3

1270.00

XCSE

GENMAB A/S

14-Apr-2025

10:38:10 AM

31

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:38:21 AM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

10:38:21 AM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

10:38:30 AM

85

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:38:32 AM

27

1270.50

TQEX

GENMAB A/S

14-Apr-2025

10:40:00 AM

47

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:40:00 AM

65

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:41:47 AM

39

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:41:47 AM

35

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:41:47 AM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:41:47 AM

27

1271.00

XCSE

GENMAB A/S

14-Apr-2025

10:41:47 AM

1

1271.00

TQEX

GENMAB A/S

14-Apr-2025

10:41:47 AM

24

1271.00

TQEX

GENMAB A/S

14-Apr-2025

10:41:47 AM

3

1271.00

CEUX

GENMAB A/S

14-Apr-2025

10:41:47 AM

84

1271.00

CEUX

GENMAB A/S

14-Apr-2025

10:42:33 AM

83

1270.00

XCSE

GENMAB A/S

14-Apr-2025

10:42:33 AM

35

1270.00

XCSE

GENMAB A/S

14-Apr-2025

10:42:33 AM

82

1270.00

CEUX

GENMAB A/S

14-Apr-2025

10:42:33 AM

33

1270.00

AQEU

GENMAB A/S

14-Apr-2025

10:42:45 AM

17

1269.50

TQEX

GENMAB A/S

14-Apr-2025

10:43:07 AM

83

1269.00

CEUX

GENMAB A/S

14-Apr-2025

10:43:07 AM

27

1269.00

AQEU

GENMAB A/S

14-Apr-2025

10:43:07 AM

5

1269.00

AQEU

GENMAB A/S

14-Apr-2025

10:43:15 AM

58

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:43:15 AM

24

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:45:42 AM

10

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:46:59 AM

64

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:46:59 AM

20

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:46:59 AM

35

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:46:59 AM

26

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:46:59 AM

83

1268.50

CEUX

GENMAB A/S

14-Apr-2025

10:47:10 AM

26

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:47:10 AM

35

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:47:21 AM

28

1268.00

TQEX

GENMAB A/S

14-Apr-2025

10:49:09 AM

59

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:49:23 AM

21

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:49:34 AM

37

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:49:34 AM

26

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:49:34 AM

16

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:49:34 AM

33

1269.50

XCSE

6


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

10:50:10 AM

11

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:50:10 AM

39

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:50:10 AM

23

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:50:40 AM

45

1269.00

XCSE

GENMAB A/S

14-Apr-2025

10:51:05 AM

3

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:51:05 AM

28

1268.50

TQEX

GENMAB A/S

14-Apr-2025

10:51:05 AM

86

1268.50

CEUX

GENMAB A/S

14-Apr-2025

10:51:05 AM

37

1268.50

AQEU

GENMAB A/S

14-Apr-2025

10:51:13 AM

83

1267.50

XCSE

GENMAB A/S

14-Apr-2025

10:51:13 AM

89

1267.50

CEUX

GENMAB A/S

14-Apr-2025

10:51:13 AM

34

1267.50

AQEU

GENMAB A/S

14-Apr-2025

10:53:59 AM

73

1267.50

XCSE

GENMAB A/S

14-Apr-2025

10:54:34 AM

89

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:54:34 AM

27

1268.50

TQEX

GENMAB A/S

14-Apr-2025

10:54:34 AM

89

1268.50

CEUX

GENMAB A/S

14-Apr-2025

10:54:34 AM

36

1268.50

AQEU

GENMAB A/S

14-Apr-2025

10:54:40 AM

35

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:54:40 AM

26

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:54:40 AM

10

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:56:09 AM

44

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:56:09 AM

42

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:56:09 AM

82

1268.50

CEUX

GENMAB A/S

14-Apr-2025

10:56:14 AM

25

1268.50

TQEX

GENMAB A/S

14-Apr-2025

10:56:29 AM

32

1268.00

AQEU

GENMAB A/S

14-Apr-2025

10:56:40 AM

48

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:56:40 AM

32

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:56:40 AM

21

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:56:40 AM

11

1268.50

XCSE

GENMAB A/S

14-Apr-2025

10:59:24 AM

84

1269.50

XCSE

GENMAB A/S

14-Apr-2025

10:59:30 AM

34

1269.50

XCSE

GENMAB A/S

14-Apr-2025

11:00:23 AM

31

1269.50

XCSE

GENMAB A/S

14-Apr-2025

11:00:23 AM

9

1270.00

CEUX

GENMAB A/S

14-Apr-2025

11:01:00 AM

12

1270.50

XCSE

GENMAB A/S

14-Apr-2025

11:01:00 AM

100

1270.50

XCSE

GENMAB A/S

14-Apr-2025

11:01:02 AM

36

1270.50

XCSE

GENMAB A/S

14-Apr-2025

11:01:34 AM

75

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:01:34 AM

5

1271.50

CEUX

GENMAB A/S

14-Apr-2025

11:03:43 AM

88

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:03:43 AM

27

1272.50

TQEX

GENMAB A/S

14-Apr-2025

11:03:43 AM

39

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:03:43 AM

47

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:03:43 AM

20

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:04:42 AM

5

1272.50

XCSE

7


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

11:04:42 AM

89

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:04:42 AM

28

1273.00

AQEU

GENMAB A/S

14-Apr-2025

11:05:41 AM

35

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:05:41 AM

13

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:05:41 AM

41

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:05:41 AM

84

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:05:41 AM

25

1272.50

TQEX

GENMAB A/S

14-Apr-2025

11:05:41 AM

5

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:05:41 AM

5

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:05:41 AM

32

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:05:45 AM

32

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:06:34 AM

46

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:06:34 AM

26

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:06:39 AM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:06:39 AM

26

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:06:40 AM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:07:03 AM

29

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:07:03 AM

4

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:07:03 AM

82

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:07:03 AM

26

1271.50

TQEX

GENMAB A/S

14-Apr-2025

11:07:03 AM

5

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

5

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

87

1272.00

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

7

1271.00

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

2

1271.00

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

45

1271.00

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

24

1271.00

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

5

1271.00

CEUX

GENMAB A/S

14-Apr-2025

11:07:03 AM

28

1272.00

AQEU

GENMAB A/S

14-Apr-2025

11:08:27 AM

36

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:10:26 AM

39

1272.00

XCSE

GENMAB A/S

14-Apr-2025

11:10:26 AM

28

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:10:26 AM

11

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:10:26 AM

34

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:10:26 AM

25

1272.00

TQEX

GENMAB A/S

14-Apr-2025

11:10:26 AM

87

1272.00

CEUX

GENMAB A/S

14-Apr-2025

11:10:30 AM

43

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:10:40 AM

5

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:11:16 AM

21

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:11:20 AM

62

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:12:10 AM

35

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:12:10 AM

53

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:12:10 AM

25

1272.50

TQEX

8


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

11:12:10 AM

25

1272.50

AQEU

GENMAB A/S

14-Apr-2025

11:14:42 AM

55

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:14:42 AM

12

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:14:42 AM

17

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:14:42 AM

28

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:15:55 AM

39

1274.00

CEUX

GENMAB A/S

14-Apr-2025

11:15:55 AM

28

1274.00

CEUX

GENMAB A/S

14-Apr-2025

11:16:12 AM

33

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:16:12 AM

15

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:16:12 AM

39

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:16:13 AM

49

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:17:02 AM

85

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:17:48 AM

32

1274.00

CEUX

GENMAB A/S

14-Apr-2025

11:18:16 AM

15

1273.50

TQEX

GENMAB A/S

14-Apr-2025

11:18:16 AM

46

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:18:16 AM

27

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:18:16 AM

12

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:18:17 AM

10

1273.50

TQEX

GENMAB A/S

14-Apr-2025

11:18:29 AM

39

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:18:29 AM

26

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:18:29 AM

21

1273.50

AQEU

GENMAB A/S

14-Apr-2025

11:18:29 AM

12

1273.50

AQEU

GENMAB A/S

14-Apr-2025

11:19:49 AM

55

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:18 AM

32

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:18 AM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:18 AM

12

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:18 AM

26

1272.50

TQEX

GENMAB A/S

14-Apr-2025

11:20:18 AM

25

1272.50

AQEU

GENMAB A/S

14-Apr-2025

11:20:20 AM

58

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:20 AM

11

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:20 AM

82

1272.00

CEUX

GENMAB A/S

14-Apr-2025

11:20:23 AM

3

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:25 AM

88

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:25 AM

50

1272.00

XCSE

GENMAB A/S

14-Apr-2025

11:20:25 AM

3

1272.00

XCSE

GENMAB A/S

14-Apr-2025

11:20:25 AM

58

1272.00

XCSE

GENMAB A/S

14-Apr-2025

11:20:25 AM

1

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:20:25 AM

47

1272.00

CEUX

GENMAB A/S

14-Apr-2025

11:20:25 AM

42

1272.00

CEUX

GENMAB A/S

14-Apr-2025

11:21:29 AM

31

1271.50

AQEU

GENMAB A/S

14-Apr-2025

11:22:17 AM

88

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:22:17 AM

25

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:22:17 AM

25

1271.50

TQEX

9


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

11:23:09 AM

82

1271.00

CEUX

GENMAB A/S

14-Apr-2025

11:23:31 AM

38

1270.50

XCSE

GENMAB A/S

14-Apr-2025

11:23:31 AM

87

1270.00

XCSE

GENMAB A/S

14-Apr-2025

11:23:50 AM

35

1270.00

XCSE

GENMAB A/S

14-Apr-2025

11:24:18 AM

48

1270.00

XCSE

GENMAB A/S

14-Apr-2025

11:24:18 AM

34

1270.00

AQEU

GENMAB A/S

14-Apr-2025

11:26:33 AM

35

1270.00

XCSE

GENMAB A/S

14-Apr-2025

11:26:33 AM

13

1270.00

XCSE

GENMAB A/S

14-Apr-2025

11:26:33 AM

47

1270.00

XCSE

GENMAB A/S

14-Apr-2025

11:26:33 AM

75

1269.50

CEUX

GENMAB A/S

14-Apr-2025

11:26:33 AM

10

1269.50

CEUX

GENMAB A/S

14-Apr-2025

11:29:38 AM

89

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:29:38 AM

58

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:29:38 AM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:29:38 AM

25

1271.50

TQEX

GENMAB A/S

14-Apr-2025

11:29:38 AM

85

1271.50

CEUX

GENMAB A/S

14-Apr-2025

11:29:53 AM

10

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:29:53 AM

21

1271.50

XCSE

GENMAB A/S

14-Apr-2025

11:30:48 AM

22

1272.00

AQEU

GENMAB A/S

14-Apr-2025

11:31:44 AM

84

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:31:45 AM

51

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:31:45 AM

47

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:31:45 AM

14

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:31:45 AM

76

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:31:45 AM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:32:10 AM

10

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:32:10 AM

58

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:32:10 AM

44

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:32:57 AM

85

1274.00

XCSE

GENMAB A/S

14-Apr-2025

11:32:57 AM

25

1274.00

AQEU

GENMAB A/S

14-Apr-2025

11:32:57 AM

25

1274.50

TQEX

GENMAB A/S

14-Apr-2025

11:32:57 AM

83

1274.50

CEUX

GENMAB A/S

14-Apr-2025

11:35:50 AM

13

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:36:59 AM

84

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:36:59 AM

68

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:36:59 AM

15

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:36:59 AM

25

1273.50

TQEX

GENMAB A/S

14-Apr-2025

11:36:59 AM

75

1273.50

CEUX

GENMAB A/S

14-Apr-2025

11:37:00 AM

31

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:37:00 AM

11

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:37:13 AM

35

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:37:24 AM

27

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:37:26 AM

35

1273.00

XCSE

10


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

11:37:26 AM

21

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:39:00 AM

31

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:39:00 AM

29

1272.50

AQEU

GENMAB A/S

14-Apr-2025

11:39:00 AM

26

1272.50

TQEX

GENMAB A/S

14-Apr-2025

11:39:00 AM

45

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:39:00 AM

3

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:39:30 AM

50

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:39:30 AM

58

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:39:49 AM

25

1272.00

CEUX

GENMAB A/S

14-Apr-2025

11:39:49 AM

1

1272.00

CEUX

GENMAB A/S

14-Apr-2025

11:40:43 AM

50

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:40:43 AM

12

1272.50

XCSE

GENMAB A/S

14-Apr-2025

11:41:29 AM

84

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:42:50 AM

37

1274.50

XCSE

GENMAB A/S

14-Apr-2025

11:43:30 AM

5

1274.50

XCSE

GENMAB A/S

14-Apr-2025

11:43:55 AM

44

1275.50

XCSE

GENMAB A/S

14-Apr-2025

11:44:20 AM

83

1275.50

XCSE

GENMAB A/S

14-Apr-2025

11:44:20 AM

25

1275.50

TQEX

GENMAB A/S

14-Apr-2025

11:45:17 AM

15

1275.50

CEUX

GENMAB A/S

14-Apr-2025

11:45:48 AM

39

1275.50

XCSE

GENMAB A/S

14-Apr-2025

11:46:19 AM

38

1275.50

XCSE

GENMAB A/S

14-Apr-2025

11:46:19 AM

55

1275.00

CEUX

GENMAB A/S

14-Apr-2025

11:46:19 AM

32

1275.00

CEUX

GENMAB A/S

14-Apr-2025

11:46:24 AM

26

1275.00

AQEU

GENMAB A/S

14-Apr-2025

11:46:30 AM

47

1275.00

XCSE

GENMAB A/S

14-Apr-2025

11:46:30 AM

35

1275.00

XCSE

GENMAB A/S

14-Apr-2025

11:46:30 AM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

11:46:30 AM

49

1274.50

XCSE

GENMAB A/S

14-Apr-2025

11:46:30 AM

36

1274.50

XCSE

GENMAB A/S

14-Apr-2025

11:46:30 AM

10

1274.00

CEUX

GENMAB A/S

14-Apr-2025

11:46:30 AM

2

1274.00

CEUX

GENMAB A/S

14-Apr-2025

11:47:37 AM

32

1274.50

CEUX

GENMAB A/S

14-Apr-2025

11:47:37 AM

25

1274.50

CEUX

GENMAB A/S

14-Apr-2025

11:48:01 AM

82

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:48:01 AM

26

1274.00

AQEU

GENMAB A/S

14-Apr-2025

11:48:01 AM

74

1274.00

CEUX

GENMAB A/S

14-Apr-2025

11:49:01 AM

24

1273.00

AQEU

GENMAB A/S

14-Apr-2025

11:49:01 AM

25

1273.00

TQEX

GENMAB A/S

14-Apr-2025

11:49:01 AM

86

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:50:09 AM

66

1272.00

XCSE

GENMAB A/S

14-Apr-2025

11:51:43 AM

9

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:54:34 AM

25

1272.50

TQEX

GENMAB A/S

14-Apr-2025

11:54:44 AM

22

1272.50

AQEU

11


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

11:55:19 AM

16

1272.00

XCSE

GENMAB A/S

14-Apr-2025

11:55:57 AM

36

1272.50

CEUX

GENMAB A/S

14-Apr-2025

11:56:20 AM

29

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:56:20 AM

27

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:56:20 AM

11

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:56:20 AM

11

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:56:21 AM

10

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:56:21 AM

1

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:58:08 AM

42

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:58:08 AM

50

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:58:08 AM

42

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:58:08 AM

11

1273.00

XCSE

GENMAB A/S

14-Apr-2025

11:58:08 AM

6

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:59:13 AM

8

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

10

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

35

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

43

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

15

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

1

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

62

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

13

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:13 AM

37

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:14 AM

6

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:14 AM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:14 AM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:20 AM

10

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:20 AM

87

1273.00

CEUX

GENMAB A/S

14-Apr-2025

11:59:21 AM

38

1273.50

XCSE

GENMAB A/S

14-Apr-2025

11:59:51 AM

36

1274.00

CEUX

GENMAB A/S

14-Apr-2025

12:01:10 PM

84

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:01:10 PM

36

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:01:43 PM

47

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:01:43 PM

58

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:01:43 PM

7

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:01:43 PM

29

1274.00

AQEU

GENMAB A/S

14-Apr-2025

12:01:43 PM

35

1274.00

TQEX

GENMAB A/S

14-Apr-2025

12:01:44 PM

3

1274.00

CEUX

GENMAB A/S

14-Apr-2025

12:02:59 PM

33

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:02:59 PM

37

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:02:59 PM

2

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:04:04 PM

76

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:04:04 PM

8

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:04:04 PM

32

1276.00

CEUX

12


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

12:04:04 PM

1

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:04:20 PM

74

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:04:20 PM

15

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:04:20 PM

36

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:04:20 PM

4

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:04:25 PM

36

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:05:01 PM

14

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:05:05 PM

39

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:05:27 PM

6

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:05:45 PM

5

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:05:45 PM

6

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:06:19 PM

6

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:06:19 PM

6

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:06:19 PM

36

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:06:30 PM

46

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:06:37 PM

18

1275.50

CEUX

GENMAB A/S

14-Apr-2025

12:06:38 PM

42

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:07:16 PM

25

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:08:11 PM

28

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:08:43 PM

83

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:09:01 PM

40

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:10:39 PM

63

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:10:41 PM

20

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:10:41 PM

6

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:11:05 PM

6

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:13:03 PM

15

1276.50

CEUX

GENMAB A/S

14-Apr-2025

12:13:13 PM

82

1276.50

CEUX

GENMAB A/S

14-Apr-2025

12:13:55 PM

48

1277.00

XCSE

GENMAB A/S

14-Apr-2025

12:14:27 PM

10

1277.00

XCSE

GENMAB A/S

14-Apr-2025

12:14:27 PM

23

1277.00

XCSE

GENMAB A/S

14-Apr-2025

12:16:12 PM

45

1277.00

XCSE

GENMAB A/S

14-Apr-2025

12:16:19 PM

78

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:16:19 PM

45

1276.50

AQEU

GENMAB A/S

14-Apr-2025

12:16:19 PM

3

1276.50

CEUX

GENMAB A/S

14-Apr-2025

12:17:07 PM

8

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:17:07 PM

2

1276.00

TQEX

GENMAB A/S

14-Apr-2025

12:17:07 PM

44

1276.00

TQEX

GENMAB A/S

14-Apr-2025

12:17:08 PM

44

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:17:08 PM

13

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:17:08 PM

44

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:17:09 PM

99

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:17:09 PM

13

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:17:09 PM

99

1276.00

XCSE

13


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

12:17:09 PM

13

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:17:09 PM

1

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:19:43 PM

44

1276.50

CEUX

GENMAB A/S

14-Apr-2025

12:20:44 PM

49

1276.50

XCSE

GENMAB A/S

14-Apr-2025

12:20:44 PM

40

1276.50

CEUX

GENMAB A/S

14-Apr-2025

12:21:49 PM

36

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:49 PM

39

1276.00

AQEU

GENMAB A/S

14-Apr-2025

12:21:49 PM

15

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:21:49 PM

86

1275.50

CEUX

GENMAB A/S

14-Apr-2025

12:21:51 PM

36

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

36

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

23

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

13

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

35

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

10

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

31

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

11

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

11

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

43

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

36

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:21:53 PM

11

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:25:09 PM

84

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:45 PM

30

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:45 PM

10

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:45 PM

35

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:45 PM

37

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:46 PM

24

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:46 PM

10

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:46 PM

11

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:46 PM

30

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:46 PM

11

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:46 PM

26

1278.00

XCSE

GENMAB A/S

14-Apr-2025

12:27:56 PM

27

1277.50

XCSE

GENMAB A/S

14-Apr-2025

12:28:47 PM

47

1277.50

XCSE

GENMAB A/S

14-Apr-2025

12:29:03 PM

83

1277.00

XCSE

GENMAB A/S

14-Apr-2025

12:29:03 PM

38

1277.00

XCSE

GENMAB A/S

14-Apr-2025

12:29:03 PM

84

1277.00

CEUX

GENMAB A/S

14-Apr-2025

12:29:03 PM

10

1277.00

CEUX

GENMAB A/S

14-Apr-2025

12:30:13 PM

84

1276.00

CEUX

GENMAB A/S

14-Apr-2025

12:32:39 PM

66

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:34:13 PM

23

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:34:13 PM

10

1276.00

XCSE

GENMAB A/S

14-Apr-2025

12:34:13 PM

53

1276.00

TQEX

14


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

12:34:13 PM

39

1276.00

AQEU

GENMAB A/S

14-Apr-2025

12:34:49 PM

84

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:34:49 PM

27

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:34:49 PM

11

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:34:49 PM

43

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:34:49 PM

31

1275.00

TQEX

GENMAB A/S

14-Apr-2025

12:34:49 PM

28

1275.00

AQEU

GENMAB A/S

14-Apr-2025

12:34:49 PM

36

1275.50

CEUX

GENMAB A/S

14-Apr-2025

12:34:49 PM

2

1275.50

CEUX

GENMAB A/S

14-Apr-2025

12:34:49 PM

47

1275.50

CEUX

GENMAB A/S

14-Apr-2025

12:34:49 PM

86

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:35:50 PM

51

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:35:50 PM

35

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:40:28 PM

31

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:40:28 PM

54

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:40:41 PM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:40:41 PM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:40:41 PM

1

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:40:41 PM

5

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:40:41 PM

5

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:40:41 PM

6

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:41:45 PM

35

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

43

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

34

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

13

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

43

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

13

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

13

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

30

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:41:45 PM

36

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:41:45 PM

5

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:41:45 PM

1

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:41:45 PM

48

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:41:45 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:09 PM

64

1273.50

XCSE

GENMAB A/S

14-Apr-2025

12:42:09 PM

1

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:09 PM

16

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:09 PM

13

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:09 PM

11

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:09 PM

22

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:10 PM

1

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:11 PM

2

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:23 PM

36

1274.50

CEUX

15


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

12:42:23 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:23 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:23 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:23 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:23 PM

32

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:23 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:23 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:24 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:24 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:24 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:24 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:24 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:24 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:25 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:26 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:26 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:26 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:26 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:26 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:26 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:27 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:57 PM

15

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:57 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:57 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:57 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:57 PM

11

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:42:57 PM

7

1274.50

CEUX

16


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

12:43:14 PM

24

1274.00

TQEX

GENMAB A/S

14-Apr-2025

12:43:14 PM

7

1274.00

TQEX

GENMAB A/S

14-Apr-2025

12:43:14 PM

25

1274.00

AQEU

GENMAB A/S

14-Apr-2025

12:43:14 PM

84

1274.00

CEUX

GENMAB A/S

14-Apr-2025

12:43:40 PM

47

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:43:40 PM

6

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:47:09 PM

23

1273.50

XCSE

GENMAB A/S

14-Apr-2025

12:47:15 PM

63

1274.00

TQEX

GENMAB A/S

14-Apr-2025

12:47:15 PM

67

1274.00

CEUX

GENMAB A/S

14-Apr-2025

12:47:47 PM

22

1274.00

CEUX

GENMAB A/S

14-Apr-2025

12:49:39 PM

35

1275.00

TQEX

GENMAB A/S

14-Apr-2025

12:49:53 PM

11

1275.00

TQEX

GENMAB A/S

14-Apr-2025

12:51:13 PM

12

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:51:13 PM

1

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:51:13 PM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:51:13 PM

34

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:51:13 PM

85

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:53:26 PM

49

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:26 PM

13

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:26 PM

43

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:26 PM

7

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:27 PM

14

1274.50

AQEU

GENMAB A/S

14-Apr-2025

12:53:29 PM

40

1274.50

AQEU

GENMAB A/S

14-Apr-2025

12:53:38 PM

83

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:53:39 PM

46

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:39 PM

12

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:39 PM

43

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:39 PM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:40 PM

10

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:40 PM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:40 PM

43

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:53:40 PM

48

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

28

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

12

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

12

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

13

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

43

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

10

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

43

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

12

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:54:54 PM

13

1275.50

XCSE

GENMAB A/S

14-Apr-2025

12:55:48 PM

45

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:56:09 PM

9

1274.00

TQEX

17


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

12:56:09 PM

9

1274.00

TQEX

GENMAB A/S

14-Apr-2025

12:56:09 PM

13

1275.00

CEUX

GENMAB A/S

14-Apr-2025

12:56:15 PM

11

1274.50

XCSE

GENMAB A/S

14-Apr-2025

12:56:16 PM

1

1274.50

XCSE

GENMAB A/S

14-Apr-2025

12:56:20 PM

57

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:57:25 PM

86

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:57:25 PM

25

1275.00

TQEX

GENMAB A/S

14-Apr-2025

12:57:29 PM

27

1274.50

CEUX

GENMAB A/S

14-Apr-2025

12:57:30 PM

10

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:57:30 PM

32

1275.00

XCSE

GENMAB A/S

14-Apr-2025

12:58:08 PM

59

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:58:09 PM

28

1274.50

AQEU

GENMAB A/S

14-Apr-2025

12:58:11 PM

27

1274.00

XCSE

GENMAB A/S

14-Apr-2025

12:58:11 PM

26

1274.00

TQEX

GENMAB A/S

14-Apr-2025

1:00:08 PM

68

1274.00

XCSE

GENMAB A/S

14-Apr-2025

1:00:08 PM

36

1274.00

CEUX

GENMAB A/S

14-Apr-2025

1:00:23 PM

11

1274.00

CEUX

GENMAB A/S

14-Apr-2025

1:00:30 PM

26

1274.00

XCSE

GENMAB A/S

14-Apr-2025

1:01:16 PM

7

1274.00

XCSE

GENMAB A/S

14-Apr-2025

1:01:16 PM

47

1274.00

XCSE

GENMAB A/S

14-Apr-2025

1:01:16 PM

43

1274.00

XCSE

GENMAB A/S

14-Apr-2025

1:01:16 PM

5

1274.00

XCSE

GENMAB A/S

14-Apr-2025

1:02:50 PM

39

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:02:50 PM

43

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:02:50 PM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:02:50 PM

10

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:02:50 PM

9

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:04:40 PM

1

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:04:40 PM

43

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:04:40 PM

11

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:04:40 PM

12

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:04:40 PM

21

1275.00

XCSE

GENMAB A/S

14-Apr-2025

1:04:41 PM

36

1274.50

CEUX

GENMAB A/S

14-Apr-2025

1:06:23 PM

85

1274.00

CEUX

GENMAB A/S

14-Apr-2025

1:06:40 PM

88

1274.00

XCSE

GENMAB A/S

14-Apr-2025

1:06:40 PM

43

1274.50

XCSE

GENMAB A/S

14-Apr-2025

1:06:40 PM

12

1274.50

XCSE

GENMAB A/S

14-Apr-2025

1:06:40 PM

13

1274.50

XCSE

GENMAB A/S

14-Apr-2025

1:06:40 PM

4

1274.50

XCSE

GENMAB A/S

14-Apr-2025

1:06:40 PM

13

1274.50

XCSE

GENMAB A/S

14-Apr-2025

1:06:40 PM

27

1274.50

XCSE

GENMAB A/S

14-Apr-2025

1:06:40 PM

26

1274.00

TQEX

GENMAB A/S

14-Apr-2025

1:06:40 PM

30

1274.00

CEUX

18


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

1:06:49 PM

10

1273.00

XCSE

GENMAB A/S

14-Apr-2025

1:06:49 PM

41

1273.50

AQEU

GENMAB A/S

14-Apr-2025

1:06:49 PM

2

1273.50

AQEU

GENMAB A/S

14-Apr-2025

1:06:49 PM

11

1273.50

AQEU

GENMAB A/S

14-Apr-2025

1:07:27 PM

77

1273.00

XCSE

GENMAB A/S

14-Apr-2025

1:07:27 PM

3

1273.50

CEUX

GENMAB A/S

14-Apr-2025

1:07:27 PM

9

1273.50

CEUX

GENMAB A/S

14-Apr-2025

1:07:27 PM

36

1273.50

CEUX

GENMAB A/S

14-Apr-2025

1:07:27 PM

1

1273.50

CEUX

GENMAB A/S

14-Apr-2025

1:07:27 PM

47

1273.50

CEUX

GENMAB A/S

14-Apr-2025

1:07:27 PM

4

1273.00

CEUX

GENMAB A/S

14-Apr-2025

1:07:27 PM

20

1273.00

CEUX

GENMAB A/S

14-Apr-2025

1:07:27 PM

64

1273.00

CEUX

GENMAB A/S

14-Apr-2025

1:07:48 PM

15

1272.50

TQEX

GENMAB A/S

14-Apr-2025

1:08:04 PM

33

1272.50

TQEX

GENMAB A/S

14-Apr-2025

1:08:04 PM

42

1272.50

AQEU

GENMAB A/S

14-Apr-2025

1:08:04 PM

12

1272.00

CEUX

GENMAB A/S

14-Apr-2025

1:08:04 PM

73

1272.00

CEUX

GENMAB A/S

14-Apr-2025

1:08:06 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:08:06 PM

74

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:12:33 PM

8

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:12:51 PM

74

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:13:00 PM

27

1271.00

TQEX

GENMAB A/S

14-Apr-2025

1:13:00 PM

27

1271.00

AQEU

GENMAB A/S

14-Apr-2025

1:13:00 PM

3

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:13:46 PM

11

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:13:46 PM

11

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:13:46 PM

43

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:13:47 PM

10

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:13:47 PM

43

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:13:47 PM

30

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:13:47 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:13:47 PM

11

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:14:13 PM

36

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:14:13 PM

49

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:14:13 PM

25

1271.00

TQEX

GENMAB A/S

14-Apr-2025

1:14:13 PM

25

1271.00

AQEU

GENMAB A/S

14-Apr-2025

1:14:58 PM

16

1270.00

AQEU

GENMAB A/S

14-Apr-2025

1:15:30 PM

89

1269.50

XCSE

GENMAB A/S

14-Apr-2025

1:16:27 PM

4

1270.00

CEUX

GENMAB A/S

14-Apr-2025

1:16:27 PM

26

1270.00

CEUX

GENMAB A/S

14-Apr-2025

1:16:28 PM

26

1270.00

TQEX

GENMAB A/S

14-Apr-2025

1:16:53 PM

86

1269.00

XCSE

19


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

1:16:53 PM

86

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:18:29 PM

7

1268.50

XCSE

GENMAB A/S

14-Apr-2025

1:18:29 PM

25

1268.50

AQEU

GENMAB A/S

14-Apr-2025

1:18:29 PM

82

1268.50

CEUX

GENMAB A/S

14-Apr-2025

1:18:30 PM

85

1268.00

XCSE

GENMAB A/S

14-Apr-2025

1:18:53 PM

86

1269.00

XCSE

GENMAB A/S

14-Apr-2025

1:21:41 PM

89

1269.50

XCSE

GENMAB A/S

14-Apr-2025

1:21:41 PM

33

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:21:42 PM

27

1269.50

AQEU

GENMAB A/S

14-Apr-2025

1:21:42 PM

53

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:24:11 PM

13

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:24:11 PM

43

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:24:11 PM

31

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:24:11 PM

25

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:24:12 PM

13

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:24:53 PM

72

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:25:02 PM

12

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:25:02 PM

11

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:25:02 PM

25

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:25:02 PM

31

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:25:02 PM

33

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:25:02 PM

25

1269.50

TQEX

GENMAB A/S

14-Apr-2025

1:25:04 PM

84

1269.00

XCSE

GENMAB A/S

14-Apr-2025

1:25:04 PM

15

1269.50

AQEU

GENMAB A/S

14-Apr-2025

1:25:50 PM

82

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:25:50 PM

86

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:27:53 PM

11

1272.00

TQEX

GENMAB A/S

14-Apr-2025

1:27:58 PM

14

1272.00

TQEX

GENMAB A/S

14-Apr-2025

1:29:16 PM

87

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:29:16 PM

25

1272.00

XCSE

GENMAB A/S

14-Apr-2025

1:29:16 PM

41

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:29:16 PM

47

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:31:00 PM

49

1272.00

XCSE

GENMAB A/S

14-Apr-2025

1:31:20 PM

12

1272.00

XCSE

GENMAB A/S

14-Apr-2025

1:31:20 PM

21

1272.00

XCSE

GENMAB A/S

14-Apr-2025

1:31:45 PM

14

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:31:50 PM

13

1272.00

XCSE

GENMAB A/S

14-Apr-2025

1:31:50 PM

28

1272.00

XCSE

GENMAB A/S

14-Apr-2025

1:31:51 PM

17

1271.50

AQEU

GENMAB A/S

14-Apr-2025

1:32:02 PM

55

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:32:13 PM

84

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:32:13 PM

16

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:32:14 PM

9

1271.50

AQEU

20


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

1:34:27 PM

41

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:34:27 PM

71

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:34:29 PM

25

1271.00

TQEX

GENMAB A/S

14-Apr-2025

1:34:29 PM

21

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:34:39 PM

83

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:34:39 PM

68

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:34:40 PM

13

1270.00

TQEX

GENMAB A/S

14-Apr-2025

1:34:40 PM

12

1270.00

AQEU

GENMAB A/S

14-Apr-2025

1:37:14 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:37:14 PM

22

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:37:14 PM

29

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:37:14 PM

31

1270.50

TQEX

GENMAB A/S

14-Apr-2025

1:38:10 PM

47

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:38:10 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:38:10 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:38:10 PM

41

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:38:10 PM

2

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:38:20 PM

85

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:40:59 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:44:09 PM

20

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:44:10 PM

12

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:44:10 PM

15

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:45:11 PM

31

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:45:11 PM

52

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:46:09 PM

41

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:46:09 PM

12

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:46:09 PM

22

1270.50

XCSE

GENMAB A/S

14-Apr-2025

1:46:09 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:46:09 PM

14

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:46:35 PM

26

1270.50

TQEX

GENMAB A/S

14-Apr-2025

1:47:39 PM

54

1269.50

XCSE

GENMAB A/S

14-Apr-2025

1:47:39 PM

14

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:48:58 PM

19

1270.00

AQEU

GENMAB A/S

14-Apr-2025

1:48:58 PM

36

1270.00

CEUX

GENMAB A/S

14-Apr-2025

1:48:58 PM

3

1270.00

CEUX

GENMAB A/S

14-Apr-2025

1:48:59 PM

50

1270.00

CEUX

GENMAB A/S

14-Apr-2025

1:48:59 PM

11

1270.00

CEUX

GENMAB A/S

14-Apr-2025

1:50:29 PM

35

1269.50

XCSE

GENMAB A/S

14-Apr-2025

1:50:29 PM

28

1269.50

TQEX

GENMAB A/S

14-Apr-2025

1:50:29 PM

2

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:50:29 PM

20

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:50:53 PM

63

1269.50

CEUX

GENMAB A/S

14-Apr-2025

1:51:10 PM

45

1270.00

CEUX

21


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

1:51:42 PM

37

1270.00

CEUX

GENMAB A/S

14-Apr-2025

1:53:23 PM

6

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

35

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:23 PM

32

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:53:23 PM

11

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:53:23 PM

14

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:53:23 PM

30

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:53:23 PM

5

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:53:23 PM

6

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:53:37 PM

28

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:50 PM

24

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:50 PM

14

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:53:50 PM

19

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:54:49 PM

26

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:54:49 PM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:54:49 PM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:55:16 PM

42

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:55:16 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:55:16 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

1:55:16 PM

5

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:55:16 PM

5

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:55:17 PM

36

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:55:17 PM

5

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:55:17 PM

5

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:55:18 PM

36

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:56:02 PM

6

1271.50

CEUX

GENMAB A/S

14-Apr-2025

1:56:29 PM

35

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

4

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

34

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

30

1271.00

XCSE

22


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

1:56:29 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

4

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:29 PM

36

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:56:29 PM

6

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:56:29 PM

5

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:56:29 PM

6

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:56:29 PM

1

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:56:29 PM

47

1271.00

CEUX

GENMAB A/S

14-Apr-2025

1:56:29 PM

30

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:56:30 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

31

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

33

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:30 PM

25

1270.50

TQEX

GENMAB A/S

14-Apr-2025

1:56:30 PM

16

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:56:30 PM

35

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:56:30 PM

6

1270.50

CEUX

GENMAB A/S

14-Apr-2025

1:56:40 PM

49

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:40 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:40 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:40 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:40 PM

17

1270.50

AQEU

GENMAB A/S

14-Apr-2025

1:56:44 PM

85

1270.00

XCSE

GENMAB A/S

14-Apr-2025

1:56:44 PM

35

1270.50

AQEU

GENMAB A/S

14-Apr-2025

1:58:10 PM

89

1269.00

XCSE

GENMAB A/S

14-Apr-2025

1:58:10 PM

22

1269.50

TQEX

GENMAB A/S

14-Apr-2025

1:58:10 PM

3

1269.50

TQEX

GENMAB A/S

14-Apr-2025

1:58:10 PM

32

1269.00

AQEU

GENMAB A/S

14-Apr-2025

1:58:10 PM

82

1269.00

CEUX

GENMAB A/S

14-Apr-2025

1:58:29 PM

82

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:00:13 PM

86

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:01:57 PM

42

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:01:57 PM

40

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:01:57 PM

35

1268.50

XCSE

23


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:01:57 PM

12

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:02:01 PM

31

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:02:01 PM

13

1268.00

TQEX

GENMAB A/S

14-Apr-2025

2:03:04 PM

60

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:03:04 PM

7

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:03:04 PM

14

1268.00

TQEX

GENMAB A/S

14-Apr-2025

2:03:04 PM

26

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:03:04 PM

20

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:03:04 PM

28

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:03:04 PM

42

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:03:09 PM

8

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:04:19 PM

42

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:04:19 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:04:19 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:04:22 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:04:22 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:04:47 PM

2

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:04:52 PM

10

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:04:52 PM

43

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:04:52 PM

11

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:04:52 PM

11

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:04:52 PM

2

1269.00

TQEX

GENMAB A/S

14-Apr-2025

2:04:52 PM

2

1269.00

TQEX

GENMAB A/S

14-Apr-2025

2:05:11 PM

32

1269.00

TQEX

GENMAB A/S

14-Apr-2025

2:05:20 PM

11

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:05:20 PM

12

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:05:20 PM

43

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:05:20 PM

35

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:05:20 PM

11

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:05:34 PM

77

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:05:34 PM

6

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:05:34 PM

36

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:05:35 PM

32

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:05:35 PM

65

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:07:05 PM

24

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:08:49 PM

7

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:08:49 PM

43

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:08:49 PM

37

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:08:49 PM

4

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:08:49 PM

3

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:08:49 PM

6

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:08:49 PM

5

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:08:49 PM

1

1268.00

TQEX

24


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:08:49 PM

24

1268.00

TQEX

GENMAB A/S

14-Apr-2025

2:08:49 PM

8

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:08:49 PM

37

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:08:49 PM

2

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:09:09 PM

3

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:09:29 PM

64

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:09:30 PM

5

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:09:30 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:09:30 PM

13

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:09:30 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:09:30 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:09:30 PM

7

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:09:48 PM

17

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:09:54 PM

31

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:09:54 PM

36

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:09:54 PM

11

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:09:54 PM

5

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:09:54 PM

6

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:09:54 PM

5

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:08 PM

6

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:09 PM

11

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:09 PM

6

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:09 PM

5

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:09 PM

3

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:09 PM

2

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:09 PM

5

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:09 PM

6

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:11 PM

35

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:10:11 PM

8

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:10:11 PM

31

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:10:14 PM

5

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:14 PM

5

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:14 PM

6

1268.50

CEUX

GENMAB A/S

14-Apr-2025

2:10:23 PM

10

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:11:05 PM

12

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:11:05 PM

14

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:11:11 PM

8

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:11:12 PM

66

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:11:12 PM

3

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:12:09 PM

20

1267.50

CEUX

GENMAB A/S

14-Apr-2025

2:12:09 PM

65

1267.00

CEUX

GENMAB A/S

14-Apr-2025

2:12:14 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:12:14 PM

15

1267.50

XCSE

25


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:12:14 PM

48

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:13:05 PM

38

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:13:05 PM

20

1267.00

CEUX

GENMAB A/S

14-Apr-2025

2:13:16 PM

15

1267.00

AQEU

GENMAB A/S

14-Apr-2025

2:13:50 PM

43

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:13:50 PM

7

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:13:50 PM

43

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:13:50 PM

19

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:13:50 PM

36

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:13:50 PM

5

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:13:50 PM

6

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:13:50 PM

6

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:14:01 PM

87

1267.50

XCSE

GENMAB A/S

14-Apr-2025

2:14:01 PM

9

1267.50

TQEX

GENMAB A/S

14-Apr-2025

2:14:01 PM

14

1267.50

TQEX

GENMAB A/S

14-Apr-2025

2:14:01 PM

16

1267.50

TQEX

GENMAB A/S

14-Apr-2025

2:14:01 PM

33

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:14:01 PM

25

1267.50

CEUX

GENMAB A/S

14-Apr-2025

2:16:22 PM

35

1268.50

XCSE

GENMAB A/S

14-Apr-2025

2:16:22 PM

80

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:16:22 PM

2

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:16:22 PM

35

1268.00

TQEX

GENMAB A/S

14-Apr-2025

2:16:22 PM

15

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:16:22 PM

87

1268.00

CEUX

GENMAB A/S

14-Apr-2025

2:16:29 PM

16

1268.00

AQEU

GENMAB A/S

14-Apr-2025

2:17:59 PM

33

1267.50

TQEX

GENMAB A/S

14-Apr-2025

2:18:00 PM

21

1267.50

CEUX

GENMAB A/S

14-Apr-2025

2:18:52 PM

30

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:18:52 PM

50

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:18:52 PM

30

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:18:52 PM

2

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:18:52 PM

43

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:18:52 PM

43

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:18:52 PM

10

1267.50

TQEX

GENMAB A/S

14-Apr-2025

2:19:20 PM

19

1268.00

XCSE

GENMAB A/S

14-Apr-2025

2:19:51 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:19:51 PM

47

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:19:51 PM

5

1269.00

XCSE

GENMAB A/S

14-Apr-2025

2:21:37 PM

31

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:21:44 PM

45

1270.00

XCSE

GENMAB A/S

14-Apr-2025

2:21:44 PM

7

1270.00

XCSE

GENMAB A/S

14-Apr-2025

2:21:44 PM

60

1270.00

XCSE

GENMAB A/S

14-Apr-2025

2:21:44 PM

33

1270.00

CEUX

26


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:21:44 PM

44

1270.00

CEUX

GENMAB A/S

14-Apr-2025

2:21:44 PM

35

1270.00

CEUX

GENMAB A/S

14-Apr-2025

2:21:56 PM

17

1270.00

CEUX

GENMAB A/S

14-Apr-2025

2:22:34 PM

9

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:22:38 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:22:38 PM

5

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:22:40 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:22:40 PM

6

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:23:42 PM

67

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:23:44 PM

2

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:23:46 PM

62

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:23:46 PM

21

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:24:00 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:24:00 PM

41

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:24:00 PM

43

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:24:00 PM

18

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:24:49 PM

85

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:26:49 PM

89

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:26:49 PM

112

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:26:49 PM

57

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:26:49 PM

30

1271.00

TQEX

GENMAB A/S

14-Apr-2025

2:26:49 PM

25

1270.00

TQEX

GENMAB A/S

14-Apr-2025

2:26:49 PM

36

1271.00

AQEU

GENMAB A/S

14-Apr-2025

2:26:49 PM

40

1270.00

AQEU

GENMAB A/S

14-Apr-2025

2:26:49 PM

84

1271.00

CEUX

GENMAB A/S

14-Apr-2025

2:26:49 PM

25

1271.00

CEUX

GENMAB A/S

14-Apr-2025

2:26:49 PM

25

1270.00

CEUX

GENMAB A/S

14-Apr-2025

2:26:51 PM

18

1269.50

CEUX

GENMAB A/S

14-Apr-2025

2:27:26 PM

1

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:27:26 PM

69

1269.50

CEUX

GENMAB A/S

14-Apr-2025

2:28:52 PM

42

1270.00

XCSE

GENMAB A/S

14-Apr-2025

2:28:52 PM

84

1269.50

XCSE

GENMAB A/S

14-Apr-2025

2:29:13 PM

76

1269.50

CEUX

GENMAB A/S

14-Apr-2025

2:32:19 PM

87

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

54

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

10

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

35

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

49

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

51

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:32:19 PM

7

1271.00

TQEX

GENMAB A/S

14-Apr-2025

2:32:19 PM

5

1271.00

TQEX

27


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:32:19 PM

22

1271.00

TQEX

GENMAB A/S

14-Apr-2025

2:32:19 PM

84

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:32:19 PM

4

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:32:32 PM

9

1271.00

AQEU

GENMAB A/S

14-Apr-2025

2:32:44 PM

18

1271.00

AQEU

GENMAB A/S

14-Apr-2025

2:33:10 PM

54

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:33:10 PM

10

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:36:33 PM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:36:33 PM

54

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:36:33 PM

11

1272.50

CEUX

GENMAB A/S

14-Apr-2025

2:36:33 PM

28

1272.50

CEUX

GENMAB A/S

14-Apr-2025

2:38:04 PM

48

1274.50

XCSE

GENMAB A/S

14-Apr-2025

2:38:23 PM

48

1274.50

XCSE

GENMAB A/S

14-Apr-2025

2:38:23 PM

36

1274.50

CEUX

GENMAB A/S

14-Apr-2025

2:38:25 PM

48

1274.50

XCSE

GENMAB A/S

14-Apr-2025

2:38:26 PM

48

1274.50

XCSE

GENMAB A/S

14-Apr-2025

2:38:26 PM

48

1274.50

XCSE

GENMAB A/S

14-Apr-2025

2:38:26 PM

14

1274.50

CEUX

GENMAB A/S

14-Apr-2025

2:38:27 PM

48

1274.50

XCSE

GENMAB A/S

14-Apr-2025

2:40:36 PM

85

1273.50

XCSE

GENMAB A/S

14-Apr-2025

2:40:36 PM

45

1274.00

XCSE

GENMAB A/S

14-Apr-2025

2:40:36 PM

54

1274.00

XCSE

GENMAB A/S

14-Apr-2025

2:40:36 PM

19

1273.50

TQEX

GENMAB A/S

14-Apr-2025

2:40:36 PM

9

1273.50

TQEX

GENMAB A/S

14-Apr-2025

2:40:36 PM

8

1273.50

TQEX

GENMAB A/S

14-Apr-2025

2:40:37 PM

48

1274.00

XCSE

GENMAB A/S

14-Apr-2025

2:40:37 PM

54

1274.00

XCSE

GENMAB A/S

14-Apr-2025

2:40:37 PM

10

1274.00

XCSE

GENMAB A/S

14-Apr-2025

2:40:37 PM

61

1273.50

XCSE

GENMAB A/S

14-Apr-2025

2:40:37 PM

22

1273.50

XCSE

GENMAB A/S

14-Apr-2025

2:40:41 PM

85

1273.00

CEUX

GENMAB A/S

14-Apr-2025

2:40:47 PM

1

1272.50

AQEU

GENMAB A/S

14-Apr-2025

2:42:03 PM

38

1273.00

XCSE

GENMAB A/S

14-Apr-2025

2:42:03 PM

54

1273.00

XCSE

GENMAB A/S

14-Apr-2025

2:42:03 PM

84

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:42:03 PM

5

1272.50

TQEX

GENMAB A/S

14-Apr-2025

2:42:03 PM

30

1272.50

TQEX

GENMAB A/S

14-Apr-2025

2:42:03 PM

14

1272.50

AQEU

GENMAB A/S

14-Apr-2025

2:42:10 PM

21

1272.50

AQEU

GENMAB A/S

14-Apr-2025

2:42:10 PM

2

1272.50

AQEU

GENMAB A/S

14-Apr-2025

2:42:20 PM

84

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:42:20 PM

36

1272.50

CEUX

GENMAB A/S

14-Apr-2025

2:42:20 PM

88

1272.00

CEUX

28


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:43:03 PM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:43:53 PM

82

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:43:53 PM

5

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:43:53 PM

25

1271.00

TQEX

GENMAB A/S

14-Apr-2025

2:43:53 PM

24

1271.00

AQEU

GENMAB A/S

14-Apr-2025

2:43:53 PM

36

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:43:54 PM

16

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:43:54 PM

6

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:43:58 PM

12

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:43:59 PM

11

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:43:59 PM

12

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:46:13 PM

12

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:46:13 PM

34

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:46:13 PM

47

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:46:13 PM

23

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:46:37 PM

51

1271.50

XCSE

GENMAB A/S

14-Apr-2025

2:46:37 PM

1

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:48:13 PM

40

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:13 PM

35

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:13 PM

19

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:13 PM

13

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:48:17 PM

12

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:17 PM

10

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:17 PM

40

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:17 PM

35

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:17 PM

41

1272.00

AQEU

GENMAB A/S

14-Apr-2025

2:48:18 PM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:48:18 PM

6

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:48:18 PM

48

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:48:18 PM

70

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:48:18 PM

13

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:48:30 PM

10

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:48:30 PM

40

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:48:30 PM

13

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:48:30 PM

47

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:30 PM

2

1272.50

XCSE

GENMAB A/S

14-Apr-2025

2:48:30 PM

17

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:48:30 PM

8

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:48:30 PM

62

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:49:30 PM

9

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:49:30 PM

40

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:49:30 PM

10

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:49:30 PM

13

1272.00

XCSE

29


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:49:30 PM

35

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:49:31 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:49:31 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:49:31 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:49:31 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:49:32 PM

11

1272.00

CEUX

GENMAB A/S

14-Apr-2025

2:51:23 PM

40

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:51:23 PM

13

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:51:23 PM

59

1272.00

XCSE

GENMAB A/S

14-Apr-2025

2:51:23 PM

89

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:51:23 PM

86

1271.50

CEUX

GENMAB A/S

14-Apr-2025

2:52:49 PM

85

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:51 PM

2

1271.00

TQEX

GENMAB A/S

14-Apr-2025

2:53:51 PM

29

1271.00

TQEX

GENMAB A/S

14-Apr-2025

2:53:51 PM

4

1271.00

TQEX

GENMAB A/S

14-Apr-2025

2:53:51 PM

14

1271.00

AQEU

GENMAB A/S

14-Apr-2025

2:53:55 PM

35

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:55 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:55 PM

40

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:55 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:55 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:55 PM

3

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:55 PM

18

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:53:55 PM

2

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:53:55 PM

62

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:53:56 PM

9

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:56 PM

41

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:56 PM

3

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:56 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:56 PM

38

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:53:56 PM

7

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:54:00 PM

46

1270.00

XCSE

GENMAB A/S

14-Apr-2025

2:54:00 PM

41

1270.00

XCSE

GENMAB A/S

14-Apr-2025

2:54:00 PM

28

1270.00

TQEX

GENMAB A/S

14-Apr-2025

2:54:01 PM

5

1270.00

TQEX

GENMAB A/S

14-Apr-2025

2:54:01 PM

25

1270.00

AQEU

GENMAB A/S

14-Apr-2025

2:54:02 PM

84

1269.50

CEUX

GENMAB A/S

14-Apr-2025

2:54:20 PM

25

1269.50

TQEX

GENMAB A/S

14-Apr-2025

2:55:56 PM

17

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:55:56 PM

13

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:55:56 PM

11

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:56:08 PM

12

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:56:09 PM

11

1270.50

XCSE

30


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

2:56:09 PM

13

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:56:20 PM

13

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:56:20 PM

11

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:56:21 PM

11

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:57:05 PM

21

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:57:09 PM

43

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:57:09 PM

18

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:57:34 PM

35

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:57:34 PM

39

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:57:34 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:57:34 PM

6

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:57:34 PM

6

1270.50

CEUX

GENMAB A/S

14-Apr-2025

2:58:20 PM

47

1270.50

XCSE

GENMAB A/S

14-Apr-2025

2:58:59 PM

6

1271.00

CEUX

GENMAB A/S

14-Apr-2025

2:58:59 PM

6

1271.00

CEUX

GENMAB A/S

14-Apr-2025

2:59:03 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:03 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:05 PM

22

1270.50

AQEU

GENMAB A/S

14-Apr-2025

2:59:10 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:10 PM

40

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:10 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:10 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:43 PM

24

1270.50

AQEU

GENMAB A/S

14-Apr-2025

2:59:50 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:50 PM

12

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:50 PM

40

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:50 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:50 PM

35

1271.00

XCSE

GENMAB A/S

14-Apr-2025

2:59:50 PM

2

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:00:07 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:00:07 PM

60

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:00:07 PM

28

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:00:08 PM

8

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:00:08 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:00:08 PM

15

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:01:08 PM

25

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:01:08 PM

58

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:01:08 PM

2

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:01:08 PM

8

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:01:08 PM

21

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:01:08 PM

18

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:01:08 PM

20

1269.50

CEUX

GENMAB A/S

14-Apr-2025

3:01:08 PM

36

1270.00

CEUX

31


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:02:18 PM

20

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:03:32 PM

16

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:03:32 PM

50

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:04:13 PM

35

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

19

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

40

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

18

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

84

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

47

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

40

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

25

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:04:13 PM

49

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:04:13 PM

25

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:04:13 PM

37

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:04:13 PM

33

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:04:13 PM

59

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:04:13 PM

23

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:04:13 PM

89

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:04:15 PM

12

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:04:37 PM

34

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:04:47 PM

5

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:05:19 PM

23

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:05:20 PM

7

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:05:20 PM

11

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:05:20 PM

7

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:05:20 PM

40

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:05:20 PM

11

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:05:20 PM

12

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:07:23 PM

31

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:07:24 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:07:24 PM

73

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:07:43 PM

40

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:07:43 PM

11

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:07:43 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:07:43 PM

11

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:07:43 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:08:28 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:09:09 PM

3

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:09:38 PM

29

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:10:10 PM

14

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:10 PM

40

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:10 PM

40

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:10 PM

13

1270.00

XCSE

32


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:10:11 PM

11

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:11 PM

12

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:11 PM

10

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:11 PM

10

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:24 PM

11

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:24 PM

10

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:24 PM

13

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:24 PM

11

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:24 PM

40

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:24 PM

10

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:24 PM

13

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:31 PM

12

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:31 PM

40

1270.50

XCSE

GENMAB A/S

14-Apr-2025

3:10:31 PM

84

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:10:38 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:10:53 PM

27

1270.00

AQEU

GENMAB A/S

14-Apr-2025

3:11:15 PM

41

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:11:15 PM

21

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:11:15 PM

13

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:11:40 PM

50

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

10

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

11

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

16

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

34

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

1

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:11:40 PM

50

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:12:40 PM

21

1270.50

AQEU

GENMAB A/S

14-Apr-2025

3:12:40 PM

36

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:12:45 PM

33

1270.50

TQEX

GENMAB A/S

14-Apr-2025

3:12:46 PM

10

1270.50

TQEX

GENMAB A/S

14-Apr-2025

3:14:31 PM

72

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:14:31 PM

2

1270.50

TQEX

GENMAB A/S

14-Apr-2025

3:14:40 PM

16

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:14:40 PM

19

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:14:40 PM

86

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:15:24 PM

112

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:15:24 PM

36

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:15:24 PM

9

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:15:30 PM

60

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:15:30 PM

27

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:15:33 PM

36

1270.00

AQEU

33


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:15:59 PM

85

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:19:19 PM

40

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:19:27 PM

28

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:19:28 PM

1

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:20:01 PM

42

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:20:17 PM

45

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:20:49 PM

32

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:20:49 PM

49

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:20:49 PM

21

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:20:49 PM

32

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:20:49 PM

71

1273.00

TQEX

GENMAB A/S

14-Apr-2025

3:20:49 PM

25

1273.00

AQEU

GENMAB A/S

14-Apr-2025

3:20:49 PM

84

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:20:49 PM

36

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:20:49 PM

30

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:20:53 PM

32

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:20:53 PM

22

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:20:53 PM

40

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:20:53 PM

44

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:20:53 PM

36

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:22:14 PM

10

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:14 PM

40

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:14 PM

13

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:14 PM

35

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:14 PM

14

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

13

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

40

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

11

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

35

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:15 PM

2

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:16 PM

11

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:16 PM

40

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:18 PM

40

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:18 PM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:18 PM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:18 PM

71

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:22:18 PM

13

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:22:18 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:18 PM

11

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:22 PM

12

1273.50

CEUX

34


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:22:33 PM

89

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:33 PM

43

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:22:33 PM

38

1273.50

AQEU

GENMAB A/S

14-Apr-2025

3:22:33 PM

76

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:33 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:33 PM

3

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:33 PM

10

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:45 PM

1

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:46 PM

1

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:22:50 PM

5

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:23:23 PM

10

1274.00

XCSE

GENMAB A/S

14-Apr-2025

3:23:23 PM

13

1274.00

XCSE

GENMAB A/S

14-Apr-2025

3:23:23 PM

11

1274.00

XCSE

GENMAB A/S

14-Apr-2025

3:23:24 PM

10

1274.00

XCSE

GENMAB A/S

14-Apr-2025

3:23:43 PM

78

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:23:43 PM

8

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:23:43 PM

50

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:23:43 PM

22

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:23:43 PM

8

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:23:43 PM

4

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:23:56 PM

30

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:23:56 PM

11

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:23:56 PM

9

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:23:56 PM

47

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:23:57 PM

43

1273.50

XCSE

GENMAB A/S

14-Apr-2025

3:23:57 PM

12

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:24:07 PM

34

1273.00

TQEX

GENMAB A/S

14-Apr-2025

3:24:07 PM

9

1273.00

TQEX

GENMAB A/S

14-Apr-2025

3:24:07 PM

36

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:24:07 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

3:25:29 PM

75

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:25:29 PM

10

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:25:31 PM

17

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:25:31 PM

10

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:25:31 PM

11

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:25:31 PM

16

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:25:31 PM

10

1273.00

XCSE

GENMAB A/S

14-Apr-2025

3:26:09 PM

10

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:26:09 PM

8

1273.00

CEUX

GENMAB A/S

14-Apr-2025

3:26:33 PM

1

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:26:33 PM

83

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:27:19 PM

6

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:27:19 PM

61

1272.00

TQEX

35


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:27:21 PM

3

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:29 PM

1

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

2

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

2

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

2

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

2

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

2

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

2

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

3

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:27:50 PM

8

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:28:03 PM

1

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:28:03 PM

1

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:28:03 PM

63

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:28:03 PM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:33 PM

11

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:28:33 PM

76

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:33 PM

9

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:34 PM

26

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:28:35 PM

17

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:28:40 PM

14

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:28:40 PM

22

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:40 PM

40

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:40 PM

35

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:40 PM

15

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:40 PM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:40 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:40 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:40 PM

48

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

35

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:41 PM

40

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:41 PM

37

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:41 PM

13

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:41 PM

11

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:41 PM

13

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:41 PM

18

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:28:41 PM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

6

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

15

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

17

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

21

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

6

1272.00

CEUX

36


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:28:41 PM

6

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:41 PM

6

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:28:42 PM

6

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:29:02 PM

41

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:29:02 PM

12

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:29:10 PM

7

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:10 PM

48

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:10 PM

10

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:10 PM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:10 PM

10

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:11 PM

12

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:11 PM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:11 PM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:15 PM

6

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:15 PM

63

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:29:15 PM

19

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:00 PM

35

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:00 PM

12

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:00 PM

40

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:00 PM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:01 PM

4

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:01 PM

7

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:01 PM

2

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:01 PM

12

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:01 PM

36

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:01 PM

1

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:01 PM

49

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:10 PM

86

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:10 PM

22

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:10 PM

3

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:10 PM

5

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:10 PM

15

1272.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:10 PM

50

1272.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:10 PM

2

1272.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:10 PM

45

1272.00

AQEU

GENMAB A/S

14-Apr-2025

3:30:22 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:22 PM

6

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:22 PM

5

1272.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

3

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:23 PM

5

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:23 PM

2

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:23 PM

5

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:23 PM

2

1271.00

TQEX

37


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:30:23 PM

5

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:23 PM

2

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:23 PM

3

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:23 PM

1

1271.00

TQEX

GENMAB A/S

14-Apr-2025

3:30:23 PM

1

1271.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

2

1271.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

10

1271.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

3

1271.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

2

1271.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

4

1271.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

4

1271.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

4

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

3

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:23 PM

4

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:26 PM

8

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

7

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

3

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

7

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

22

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

8

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

11

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

12

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

1

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

21

1271.50

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

64

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

3

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

21

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:26 PM

3

1271.00

AQEU

GENMAB A/S

14-Apr-2025

3:30:26 PM

3

1271.00

AQEU

GENMAB A/S

14-Apr-2025

3:30:26 PM

20

1271.00

AQEU

GENMAB A/S

14-Apr-2025

3:30:26 PM

6

1271.00

AQEU

GENMAB A/S

14-Apr-2025

3:30:26 PM

24

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:26 PM

20

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:26 PM

33

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:26 PM

6

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:26 PM

6

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:26 PM

42

1271.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:28 PM

13

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:29 PM

10

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:29 PM

13

1271.00

XCSE

38


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:30:30 PM

11

1271.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:36 PM

7

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

7

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

4

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

3

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

12

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

12

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

6

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:36 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:38 PM

3

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:38 PM

3

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:38 PM

2

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:38 PM

3

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:39 PM

86

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:39 PM

26

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:30:41 PM

40

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:30:41 PM

5

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:30:41 PM

2

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:30:41 PM

3

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:30:41 PM

2

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:30:41 PM

10

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:30:41 PM

2

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:30:41 PM

5

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:30:41 PM

4

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:30:41 PM

3

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:30:41 PM

1

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:31:16 PM

88

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

22

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

19

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

40

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

11

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

2

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

9

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

9

1270.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

88

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:31:16 PM

32

1270.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:16 PM

1

1269.50

TQEX

39


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:31:16 PM

34

1270.00

AQEU

GENMAB A/S

14-Apr-2025

3:31:16 PM

37

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:31:16 PM

2

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:16 PM

4

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:16 PM

21

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:16 PM

5

1270.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:16 PM

71

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:31:16 PM

11

1270.00

CEUX

GENMAB A/S

14-Apr-2025

3:31:16 PM

83

1269.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:24 PM

18

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

3

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

7

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

8

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

75

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:31:24 PM

19

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:24 PM

6

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:24 PM

4

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:24 PM

2

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:24 PM

2

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:24 PM

2

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:24 PM

6

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:31:24 PM

4

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:24 PM

20

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:24 PM

7

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:38 PM

9

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:31:38 PM

4

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:31:38 PM

2

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:31:38 PM

5

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:31:38 PM

8

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:31:38 PM

4

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:38 PM

35

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:38 PM

17

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:31:49 PM

85

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:31:49 PM

82

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:17 PM

55

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:32:21 PM

86

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:21 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:21 PM

9

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:21 PM

25

1269.00

TQEX

40


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:32:21 PM

30

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:32:25 PM

82

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

15

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

40

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

11

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

5

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

6

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

14

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

75

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:25 PM

33

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:32:25 PM

25

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:32:25 PM

6

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:32:25 PM

14

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:32:25 PM

68

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:32:25 PM

35

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:32:25 PM

51

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:32:33 PM

20

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

68

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

3

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

7

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

4

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

2

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

3

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

19

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

2

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

5

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

3

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

6

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

6

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

40

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:33 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:32:38 PM

7

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:38 PM

7

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:38 PM

11

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:38 PM

13

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:41 PM

9

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:41 PM

5

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:41 PM

3

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:41 PM

10

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:41 PM

2

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:41 PM

11

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:32:41 PM

47

1265.50

XCSE

41


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:32:41 PM

6

1265.50

AQEU

GENMAB A/S

14-Apr-2025

3:32:41 PM

25

1265.50

AQEU

GENMAB A/S

14-Apr-2025

3:32:41 PM

3

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:41 PM

5

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:41 PM

12

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:41 PM

15

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:41 PM

15

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:32:49 PM

64

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:33:02 PM

25

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:33:11 PM

79

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:11 PM

9

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:11 PM

6

1265.00

TQEX

GENMAB A/S

14-Apr-2025

3:33:11 PM

4

1265.00

TQEX

GENMAB A/S

14-Apr-2025

3:33:39 PM

2

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:55 PM

83

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:55 PM

112

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:55 PM

50

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:55 PM

21

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:55 PM

40

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:33:55 PM

1

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:33:55 PM

28

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:33:55 PM

4

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:33:55 PM

8

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:33:55 PM

7

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:33:55 PM

5

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:33:55 PM

1

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:33:55 PM

10

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:33:55 PM

30

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:33:55 PM

48

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:06 PM

2

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

2

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

5

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

79

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

11

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

5

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

3

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

2

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

5

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

2

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

13

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

40

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

23

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:34:06 PM

8

1264.50

XCSE

42


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:34:06 PM

15

1264.00

TQEX

GENMAB A/S

14-Apr-2025

3:34:06 PM

3

1264.00

TQEX

GENMAB A/S

14-Apr-2025

3:34:06 PM

2

1264.00

TQEX

GENMAB A/S

14-Apr-2025

3:34:06 PM

4

1264.00

TQEX

GENMAB A/S

14-Apr-2025

3:34:06 PM

4

1264.00

TQEX

GENMAB A/S

14-Apr-2025

3:34:06 PM

3

1263.50

AQEU

GENMAB A/S

14-Apr-2025

3:34:06 PM

20

1263.50

AQEU

GENMAB A/S

14-Apr-2025

3:34:06 PM

5

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:06 PM

8

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:06 PM

12

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:06 PM

28

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:06 PM

15

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:06 PM

10

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:06 PM

4

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:34:12 PM

30

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:15 PM

23

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:15 PM

31

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:15 PM

5

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:15 PM

83

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:15 PM

25

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:34:15 PM

5

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

5

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

15

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

4

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

3

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

4

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

3

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

2

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

3

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

2

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

4

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:15 PM

10

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:16 PM

7

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:34:16 PM

15

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:34:16 PM

4

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:34:17 PM

85

1263.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:17 PM

10

1263.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:17 PM

10

1263.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:17 PM

10

1263.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:17 PM

10

1263.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:17 PM

13

1263.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:17 PM

25

1263.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:18 PM

4

1262.00

XCSE

43


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:34:18 PM

28

1262.00

XCSE

GENMAB A/S

14-Apr-2025

3:34:18 PM

3

1262.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:18 PM

4

1262.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:18 PM

2

1262.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:18 PM

5

1262.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:18 PM

25

1262.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:18 PM

16

1262.00

CEUX

GENMAB A/S

14-Apr-2025

3:34:19 PM

35

1262.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:02 PM

4

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:35:02 PM

3

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:35:02 PM

2

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:35:02 PM

3

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:35:02 PM

9

1263.50

TQEX

GENMAB A/S

14-Apr-2025

3:35:02 PM

3

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:02 PM

5

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:02 PM

11

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:02 PM

3

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:02 PM

13

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:02 PM

7

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:18 PM

2

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:35:18 PM

2

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:35:18 PM

2

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:35:18 PM

7

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:35:18 PM

19

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:35:19 PM

7

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:35:19 PM

3

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:35:19 PM

2

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:35:19 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:35:19 PM

4

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:35:19 PM

3

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:35:19 PM

3

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:35:19 PM

2

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:35:21 PM

28

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:21 PM

5

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:35:21 PM

5

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:35:21 PM

15

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:35:21 PM

3

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:35:21 PM

22

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:35:21 PM

52

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:35:25 PM

59

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:25 PM

15

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:25 PM

7

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:25 PM

5

1264.00

XCSE

44


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:35:25 PM

3

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:25 PM

6

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:25 PM

48

1264.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:50 PM

76

1263.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:50 PM

14

1262.50

TQEX

GENMAB A/S

14-Apr-2025

3:35:50 PM

2

1262.50

TQEX

GENMAB A/S

14-Apr-2025

3:35:50 PM

43

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:51 PM

10

1262.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:51 PM

2

1262.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:51 PM

2

1262.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:51 PM

28

1262.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:51 PM

3

1262.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:51 PM

2

1262.50

CEUX

GENMAB A/S

14-Apr-2025

3:35:58 PM

1

1262.00

XCSE

GENMAB A/S

14-Apr-2025

3:35:58 PM

1

1262.00

XCSE

GENMAB A/S

14-Apr-2025

3:36:07 PM

8

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:07 PM

12

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:07 PM

2

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:07 PM

13

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:07 PM

4

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:07 PM

5

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:13 PM

21

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:16 PM

17

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:17 PM

6

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:36:49 PM

5

1264.50

TQEX

GENMAB A/S

14-Apr-2025

3:36:50 PM

11

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:36:50 PM

12

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:36:50 PM

13

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:36:50 PM

13

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:36:50 PM

27

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:36:50 PM

25

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:36:50 PM

10

1264.50

TQEX

GENMAB A/S

14-Apr-2025

3:36:50 PM

19

1264.50

TQEX

GENMAB A/S

14-Apr-2025

3:37:04 PM

40

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

18

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

25

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

3

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

22

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

4

1265.00

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

1

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

3

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

2

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

3

1264.50

XCSE

45


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:37:04 PM

3

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

2

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:37:04 PM

25

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:37:04 PM

17

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:04 PM

2

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:04 PM

14

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:04 PM

4

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:04 PM

2

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:05 PM

6

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:06 PM

71

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:37:06 PM

40

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:06 PM

3

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:06 PM

3

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:06 PM

18

1263.50

CEUX

GENMAB A/S

14-Apr-2025

3:37:40 PM

5

1265.00

TQEX

GENMAB A/S

14-Apr-2025

3:37:40 PM

5

1265.00

TQEX

GENMAB A/S

14-Apr-2025

3:37:40 PM

5

1265.00

TQEX

GENMAB A/S

14-Apr-2025

3:37:40 PM

5

1265.00

TQEX

GENMAB A/S

14-Apr-2025

3:37:43 PM

2

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:37:50 PM

5

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:38:02 PM

84

1264.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:02 PM

5

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:38:02 PM

2

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:38:02 PM

13

1265.00

AQEU

GENMAB A/S

14-Apr-2025

3:38:29 PM

85

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:29 PM

7

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:29 PM

38

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:29 PM

15

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:29 PM

15

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:29 PM

12

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:56 PM

84

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:56 PM

19

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:56 PM

40

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:56 PM

5

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:56 PM

9

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:56 PM

39

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:38:56 PM

34

1265.50

TQEX

GENMAB A/S

14-Apr-2025

3:38:56 PM

4

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:56 PM

15

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:56 PM

5

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:38:56 PM

20

1264.50

CEUX

GENMAB A/S

14-Apr-2025

3:39:39 PM

32

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:39:41 PM

35

1266.50

XCSE

46


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:39:41 PM

49

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:41 PM

19

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:41 PM

10

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:41 PM

10

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:41 PM

11

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:41 PM

4

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:39:41 PM

4

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:39:41 PM

32

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:39:50 PM

35

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

18

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

40

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

11

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

8

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

5

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

11

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

6

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

10

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:50 PM

40

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:39:56 PM

1

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:39:59 PM

21

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:39:59 PM

32

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:40:09 PM

5

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:40:09 PM

40

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:40:09 PM

36

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:40:09 PM

24

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:40:09 PM

1

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:40:12 PM

34

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:40:13 PM

83

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:40:13 PM

2

1265.50

TQEX

GENMAB A/S

14-Apr-2025

3:40:13 PM

32

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:40:13 PM

5

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:14 PM

14

1265.50

TQEX

GENMAB A/S

14-Apr-2025

3:40:14 PM

15

1265.50

TQEX

GENMAB A/S

14-Apr-2025

3:40:14 PM

10

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:14 PM

11

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:14 PM

2

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:14 PM

3

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:14 PM

9

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:14 PM

15

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:14 PM

33

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:40:32 PM

84

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:40:32 PM

1

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:40:59 PM

4

1267.00

XCSE

47


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:40:59 PM

27

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:40:59 PM

32

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:41:03 PM

35

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:41:03 PM

8

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:41:03 PM

13

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:41:03 PM

24

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:41:19 PM

83

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:41:33 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:41:33 PM

14

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:41:33 PM

77

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:41:40 PM

8

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:41:45 PM

6

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:41:45 PM

10

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:41:45 PM

5

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:41:45 PM

5

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:42:06 PM

3

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

1

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

5

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

3

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

10

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

2

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

3

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

4

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

4

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

10

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

22

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

35

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

11

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

5

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

5

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

1

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

2

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

2

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:06 PM

3

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

2

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

3

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

2

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

2

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

3

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

10

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

32

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

15

1266.50

CEUX

48


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:42:06 PM

40

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:06 PM

2

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:07 PM

63

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:11 PM

11

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:18 PM

87

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:18 PM

11

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:18 PM

61

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:18 PM

1

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:37 PM

84

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:42:37 PM

5

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:42:37 PM

2

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:42:37 PM

3

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:42:37 PM

2

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:42:37 PM

8

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:42:37 PM

4

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:42:37 PM

27

1267.00

AQEU

GENMAB A/S

14-Apr-2025

3:42:37 PM

7

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:37 PM

2

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:37 PM

12

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:37 PM

13

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:37 PM

7

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:37 PM

3

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:42:37 PM

11

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:43:16 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:43:16 PM

13

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:43:16 PM

24

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:43:16 PM

74

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:16 PM

9

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:16 PM

28

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:43:16 PM

15

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:43:16 PM

41

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:43:32 PM

36

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:32 PM

26

1267.00

AQEU

GENMAB A/S

14-Apr-2025

3:43:40 PM

47

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:40 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:40 PM

23

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:40 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:40 PM

2

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:43:50 PM

55

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:43:50 PM

30

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:43:50 PM

15

1266.00

TQEX

GENMAB A/S

14-Apr-2025

3:43:50 PM

12

1266.00

TQEX

GENMAB A/S

14-Apr-2025

3:43:50 PM

4

1266.00

AQEU

49


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:43:50 PM

9

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:43:50 PM

10

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:43:50 PM

15

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:43:50 PM

14

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:43:56 PM

85

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:43:56 PM

6

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:43:56 PM

76

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:44:08 PM

83

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:44:38 PM

27

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:44:55 PM

20

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:44:55 PM

39

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:44:56 PM

10

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:44:56 PM

8

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:44:56 PM

12

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:44:56 PM

12

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:44:56 PM

40

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:44:59 PM

83

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:45:44 PM

48

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:45:44 PM

37

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:45:44 PM

2

1267.00

AQEU

GENMAB A/S

14-Apr-2025

3:45:44 PM

25

1267.00

AQEU

GENMAB A/S

14-Apr-2025

3:45:44 PM

69

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:45:44 PM

13

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:45:45 PM

4

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:45:47 PM

25

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:45:48 PM

7

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:45:48 PM

11

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:45:48 PM

11

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:45:48 PM

4

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:45:51 PM

2

1266.00

TQEX

GENMAB A/S

14-Apr-2025

3:45:51 PM

23

1266.00

TQEX

GENMAB A/S

14-Apr-2025

3:45:51 PM

14

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:46:26 PM

8

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:46:33 PM

66

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:46:34 PM

23

1266.50

CEUX

GENMAB A/S

14-Apr-2025

3:46:37 PM

1

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:46:37 PM

1

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:46:37 PM

81

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:46:37 PM

23

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:46:37 PM

2

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:47:05 PM

50

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:05 PM

20

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:05 PM

33

1266.00

AQEU

50


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:47:05 PM

36

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:47:05 PM

82

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:47:21 PM

35

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

21

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

40

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

13

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

3

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

49

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

3

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

40

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

11

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:21 PM

9

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:22 PM

23

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:22 PM

13

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:22 PM

12

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:22 PM

12

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:22 PM

40

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:47:23 PM

87

1265.50

XCSE

GENMAB A/S

14-Apr-2025

3:47:23 PM

25

1265.50

TQEX

GENMAB A/S

14-Apr-2025

3:47:23 PM

4

1264.50

TQEX

GENMAB A/S

14-Apr-2025

3:47:23 PM

4

1264.50

TQEX

GENMAB A/S

14-Apr-2025

3:47:23 PM

3

1264.50

TQEX

GENMAB A/S

14-Apr-2025

3:47:23 PM

2

1264.50

TQEX

GENMAB A/S

14-Apr-2025

3:47:23 PM

32

1265.50

CEUX

GENMAB A/S

14-Apr-2025

3:47:23 PM

59

1265.00

CEUX

GENMAB A/S

14-Apr-2025

3:48:07 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:16 PM

16

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:16 PM

26

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:18 PM

7

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:49 PM

36

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:49 PM

2

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:49 PM

48

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

89

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:58 PM

4

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:48:58 PM

20

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:48:58 PM

33

1267.00

AQEU

GENMAB A/S

14-Apr-2025

3:48:58 PM

32

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.50

CEUX

51


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:48:58 PM

4

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

3

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

21

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

5

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

5

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

6

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

3

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

4

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

5

1267.50

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

3

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

2

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:48:58 PM

50

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:48:59 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

21

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

4

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

8

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

7

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

21

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

10

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:48:59 PM

14

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:49:03 PM

86

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:49:08 PM

87

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:49:56 PM

44

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:49:56 PM

42

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:07 PM

82

1269.50

CEUX

GENMAB A/S

14-Apr-2025

3:50:29 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:29 PM

25

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:29 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:29 PM

34

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:29 PM

5

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:50:29 PM

5

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:50:29 PM

5

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:50:29 PM

11

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:50:29 PM

11

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:50:29 PM

2

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:50:29 PM

18

1269.50

AQEU

GENMAB A/S

14-Apr-2025

3:50:35 PM

8

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:35 PM

11

1269.00

XCSE

52


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:50:35 PM

1

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:50:36 PM

7

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:36 PM

3

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:43 PM

20

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:43 PM

40

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:43 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:43 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:43 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:43 PM

84

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:50:44 PM

40

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:50:44 PM

15

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:50:44 PM

25

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:50:48 PM

31

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:50:49 PM

86

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:49 PM

3

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:50:49 PM

33

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:51:07 PM

67

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:51:28 PM

20

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:51:28 PM

11

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:51:28 PM

4

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:51:28 PM

2

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:51:28 PM

4

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:51:28 PM

4

1268.00

TQEX

GENMAB A/S

14-Apr-2025

3:51:28 PM

37

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:51:28 PM

36

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:51:28 PM

5

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:28 PM

34

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:28 PM

6

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:28 PM

30

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:28 PM

8

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:28 PM

1

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:52 PM

11

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:51:52 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:51:52 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:51:52 PM

40

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:51:54 PM

7

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:51:56 PM

10

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:56 PM

10

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:51:56 PM

65

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:52:00 PM

10

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:52:00 PM

13

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:52:00 PM

1

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:52:00 PM

12

1267.50

XCSE

53


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:52:00 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:52:00 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:52:00 PM

1

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:52:00 PM

87

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:00 PM

1

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:17 PM

5

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:52:17 PM

5

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:52:17 PM

25

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:52:17 PM

2

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:52:17 PM

8

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:52:39 PM

84

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:40 PM

3

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:52:40 PM

2

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:52:40 PM

7

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:52:40 PM

13

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:52:40 PM

4

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:52:40 PM

2

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:52:40 PM

86

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:52:43 PM

85

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:43 PM

6

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:43 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:43 PM

5

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:43 PM

4

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:52:43 PM

2

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:52:43 PM

20

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:52:43 PM

10

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:53:13 PM

32

1267.50

TQEX

GENMAB A/S

14-Apr-2025

3:53:41 PM

3

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:53:49 PM

84

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

40

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

13

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

17

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

7

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

3

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

5

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:02 PM

15

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:54:13 PM

25

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:54:13 PM

82

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:54:13 PM

6

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:54:14 PM

5

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:54:14 PM

22

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:54:14 PM

32

1268.50

CEUX

54


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:54:20 PM

49

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:20 PM

63

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:21 PM

23

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:21 PM

20

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:22 PM

10

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:22 PM

5

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:22 PM

40

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:22 PM

11

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:22 PM

10

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:36 PM

7

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:36 PM

2

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:36 PM

3

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:36 PM

4

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:36 PM

4

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:36 PM

60

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:36 PM

4

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:54:38 PM

4

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:54:38 PM

8

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:54:38 PM

21

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:54:38 PM

7

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:54:38 PM

5

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:54:40 PM

44

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:54:58 PM

53

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:58 PM

36

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:54:58 PM

8

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:54:58 PM

21

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:55:00 PM

1

1268.50

AQEU

GENMAB A/S

14-Apr-2025

3:55:00 PM

6

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:55:00 PM

8

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:55:00 PM

21

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:55:00 PM

1

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:55:10 PM

26

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:55:10 PM

74

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:55:11 PM

10

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:55:11 PM

60

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:55:11 PM

10

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:55:11 PM

7

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:55:36 PM

11

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:55:36 PM

12

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:55:36 PM

11

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:55:36 PM

32

1268.00

XCSE

GENMAB A/S

14-Apr-2025

3:55:39 PM

32

1268.00

CEUX

GENMAB A/S

14-Apr-2025

3:55:42 PM

3

1267.50

AQEU

55


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:56:09 PM

7

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

1

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

20

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

53

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

7

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

13

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:09 PM

17

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:56:09 PM

13

1267.00

TQEX

GENMAB A/S

14-Apr-2025

3:56:09 PM

25

1267.50

AQEU

GENMAB A/S

14-Apr-2025

3:56:09 PM

3

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:09 PM

10

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:09 PM

15

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:09 PM

9

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:09 PM

4

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:10 PM

89

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:31 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:31 PM

21

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:31 PM

11

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:31 PM

10

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:31 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:31 PM

83

1267.00

XCSE

GENMAB A/S

14-Apr-2025

3:56:31 PM

18

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:56:31 PM

8

1267.50

TQEX

GENMAB A/S

14-Apr-2025

3:56:31 PM

20

1267.50

TQEX

GENMAB A/S

14-Apr-2025

3:56:37 PM

13

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:37 PM

21

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:37 PM

1

1267.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:40 PM

20

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:40 PM

10

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:40 PM

10

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:40 PM

10

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:41 PM

85

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:56:41 PM

37

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:53 PM

25

1266.50

TQEX

GENMAB A/S

14-Apr-2025

3:56:53 PM

1

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:53 PM

14

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:56:53 PM

11

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:57:09 PM

89

1266.00

XCSE

GENMAB A/S

14-Apr-2025

3:57:09 PM

8

1266.00

AQEU

56


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:57:09 PM

5

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:57:09 PM

12

1266.00

AQEU

GENMAB A/S

14-Apr-2025

3:57:09 PM

14

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:57:09 PM

39

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:57:09 PM

3

1266.00

CEUX

GENMAB A/S

14-Apr-2025

3:57:27 PM

16

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:57:27 PM

20

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:57:27 PM

10

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:57:27 PM

28

1266.50

XCSE

GENMAB A/S

14-Apr-2025

3:57:50 PM

2

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:57:50 PM

6

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:57:50 PM

25

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:57:50 PM

2

1267.50

XCSE

GENMAB A/S

14-Apr-2025

3:58:03 PM

4

1268.00

AQEU

GENMAB A/S

14-Apr-2025

3:58:03 PM

10

1268.00

AQEU

GENMAB A/S

14-Apr-2025

3:58:11 PM

45

1268.50

XCSE

GENMAB A/S

14-Apr-2025

3:58:11 PM

34

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:58:44 PM

27

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:58:44 PM

36

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:58:49 PM

2

1269.50

CEUX

GENMAB A/S

14-Apr-2025

3:58:57 PM

84

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:58:57 PM

83

1269.50

CEUX

GENMAB A/S

14-Apr-2025

3:59:09 PM

2

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:09 PM

3

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:09 PM

32

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:59:12 PM

40

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:12 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:12 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:12 PM

11

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:12 PM

5

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:12 PM

5

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:12 PM

50

1268.50

CEUX

GENMAB A/S

14-Apr-2025

3:59:13 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:13 PM

40

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:13 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:13 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:13 PM

40

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:13 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:13 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:13 PM

29

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:20 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:20 PM

11

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:20 PM

40

1269.00

XCSE

57


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

3:59:20 PM

4

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:30 PM

40

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:30 PM

5

1269.00

XCSE

GENMAB A/S

14-Apr-2025

3:59:43 PM

7

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:59:47 PM

14

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:47 PM

5

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:47 PM

8

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:59 PM

64

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:59:59 PM

20

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:59:59 PM

3

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:59:59 PM

13

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:59:59 PM

9

1269.50

XCSE

GENMAB A/S

14-Apr-2025

3:59:59 PM

2

1269.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:59 PM

3

1268.50

TQEX

GENMAB A/S

14-Apr-2025

3:59:59 PM

2

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:59:59 PM

9

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:59:59 PM

4

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:59:59 PM

4

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:59:59 PM

2

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:59:59 PM

4

1269.00

AQEU

GENMAB A/S

14-Apr-2025

3:59:59 PM

11

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:59:59 PM

31

1269.00

CEUX

GENMAB A/S

14-Apr-2025

3:59:59 PM

43

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:08 PM

32

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:00:08 PM

82

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:10 PM

26

1270.00

AQEU

GENMAB A/S

14-Apr-2025

4:00:22 PM

66

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:23 PM

82

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:23 PM

9

1269.50

TQEX

GENMAB A/S

14-Apr-2025

4:00:23 PM

10

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:23 PM

9

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:28 PM

31

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:28 PM

50

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:28 PM

2

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:28 PM

2

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:28 PM

2

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:43 PM

89

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:46 PM

36

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:00:46 PM

45

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

4

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

40

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

3

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

13

1267.50

XCSE

58


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:00:59 PM

7

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

3

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

7

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

5

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

3

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

13

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:00:59 PM

9

1268.50

TQEX

GENMAB A/S

14-Apr-2025

4:00:59 PM

1

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:59 PM

50

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:00:59 PM

36

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:01:08 PM

84

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:01:09 PM

22

1267.00

TQEX

GENMAB A/S

14-Apr-2025

4:01:11 PM

2

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:01:11 PM

11

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:01:11 PM

5

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:01:11 PM

49

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:01:37 PM

25

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:01:37 PM

13

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:01:37 PM

13

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:01:37 PM

11

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:01:37 PM

8

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:01:37 PM

4

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:01:37 PM

16

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:01:37 PM

7

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:01:37 PM

13

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:01:48 PM

1

1268.00

XCSE

GENMAB A/S

14-Apr-2025

4:01:48 PM

85

1268.00

XCSE

GENMAB A/S

14-Apr-2025

4:01:48 PM

8

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:01:48 PM

5

1267.50

TQEX

GENMAB A/S

14-Apr-2025

4:01:48 PM

15

1267.50

TQEX

GENMAB A/S

14-Apr-2025

4:01:48 PM

10

1267.50

TQEX

GENMAB A/S

14-Apr-2025

4:01:48 PM

4

1267.50

TQEX

GENMAB A/S

14-Apr-2025

4:01:48 PM

45

1268.00

AQEU

GENMAB A/S

14-Apr-2025

4:01:48 PM

33

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:01:58 PM

13

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:01:58 PM

52

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:01:59 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:01:59 PM

3

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:02:31 PM

80

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:02:32 PM

8

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:02:49 PM

4

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:02:51 PM

35

1268.00

XCSE

GENMAB A/S

14-Apr-2025

4:02:51 PM

83

1268.00

CEUX

59


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:03:05 PM

1

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:03:05 PM

87

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:05 PM

84

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:05 PM

89

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:03:05 PM

85

1263.50

XCSE

GENMAB A/S

14-Apr-2025

4:03:05 PM

82

1262.50

XCSE

GENMAB A/S

14-Apr-2025

4:03:05 PM

83

1261.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:05 PM

16

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:03:05 PM

88

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:03:05 PM

84

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:03:05 PM

26

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:03:05 PM

26

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:03:05 PM

48

1263.50

CEUX

GENMAB A/S

14-Apr-2025

4:03:06 PM

20

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:03:06 PM

10

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:03:06 PM

5

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:03:09 PM

46

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:03:20 PM

4

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:20 PM

4

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:20 PM

18

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:29 PM

2

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:29 PM

2

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:03:49 PM

26

1266.00

TQEX

GENMAB A/S

14-Apr-2025

4:04:32 PM

2

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

65

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:05:07 PM

22

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:05:07 PM

40

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:05:07 PM

4

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:05:07 PM

8

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:05:07 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:05:07 PM

2

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

3

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

2

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

5

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

2

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

8

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

2

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:05:07 PM

25

1265.00

AQEU

GENMAB A/S

14-Apr-2025

4:05:07 PM

37

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:05:09 PM

22

1265.50

TQEX

GENMAB A/S

14-Apr-2025

4:05:39 PM

85

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:07:14 PM

100

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:07:14 PM

36

1268.50

CEUX

60


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:07:15 PM

67

1268.00

XCSE

GENMAB A/S

14-Apr-2025

4:07:33 PM

17

1268.00

XCSE

GENMAB A/S

14-Apr-2025

4:07:33 PM

10

1268.00

XCSE

GENMAB A/S

14-Apr-2025

4:07:33 PM

27

1268.00

XCSE

GENMAB A/S

14-Apr-2025

4:07:33 PM

31

1268.00

AQEU

GENMAB A/S

14-Apr-2025

4:07:33 PM

54

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:07:33 PM

35

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:07:33 PM

20

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:07:59 PM

82

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:03 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:03 PM

13

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:03 PM

11

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:03 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:03 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:03 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:03 PM

40

1267.00

TQEX

GENMAB A/S

14-Apr-2025

4:08:03 PM

3

1267.00

TQEX

GENMAB A/S

14-Apr-2025

4:08:03 PM

5

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:08:03 PM

84

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:08:04 PM

11

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

11

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

11

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

11

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

21

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

17

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

59

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:04 PM

112

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:18 PM

36

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:08:18 PM

88

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:18 PM

1

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:08:18 PM

20

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:08:18 PM

36

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:09:09 PM

83

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:09:13 PM

25

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:09:13 PM

60

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:09:24 PM

5

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:09:24 PM

6

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:09:24 PM

5

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:09:24 PM

61

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:09:24 PM

19

1267.00

CEUX

61


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:09:26 PM

40

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:09:26 PM

13

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:09:26 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:09:26 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:10:19 PM

23

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:10:19 PM

86

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:10:19 PM

36

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:10:20 PM

40

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:10:20 PM

13

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:10:20 PM

26

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:10:20 PM

4

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:10:21 PM

49

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:10:23 PM

100

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:10:33 PM

86

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:10:33 PM

5

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:10:33 PM

28

1266.00

AQEU

GENMAB A/S

14-Apr-2025

4:10:33 PM

28

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:10:38 PM

88

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:11:19 PM

36

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:11:19 PM

36

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:11:19 PM

79

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:11:19 PM

9

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:11:48 PM

100

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:11:48 PM

6

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:11:49 PM

100

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:11:56 PM

78

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:16 PM

31

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:16 PM

23

1266.00

TQEX

GENMAB A/S

14-Apr-2025

4:12:16 PM

3

1266.00

TQEX

GENMAB A/S

14-Apr-2025

4:12:16 PM

20

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:12:22 PM

51

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:23 PM

6

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:12:23 PM

6

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:12:23 PM

6

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:12:47 PM

89

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

35

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

40

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

25

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

11

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

1

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

12

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

11

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

40

1266.00

XCSE

62


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:12:47 PM

11

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:12:47 PM

27

1266.00

TQEX

GENMAB A/S

14-Apr-2025

4:12:47 PM

22

1266.00

TQEX

GENMAB A/S

14-Apr-2025

4:12:47 PM

27

1266.00

AQEU

GENMAB A/S

14-Apr-2025

4:12:47 PM

36

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:12:47 PM

45

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:12:50 PM

39

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:12:56 PM

4

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:12:56 PM

82

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:13:11 PM

36

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:13:12 PM

13

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:13:17 PM

32

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:13:25 PM

48

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:13:25 PM

64

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:13:37 PM

2

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:13:37 PM

23

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:14:12 PM

23

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:14:12 PM

64

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:14:12 PM

40

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:14:12 PM

5

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:14:12 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:14:12 PM

39

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:14:12 PM

88

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:14:14 PM

68

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:14:29 PM

82

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:14:29 PM

24

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:14:29 PM

8

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:14:29 PM

25

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:14:29 PM

32

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:14:54 PM

56

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:14:56 PM

4

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:14:56 PM

23

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:14:56 PM

10

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:14:56 PM

70

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:14:56 PM

5

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:15:04 PM

65

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:15:04 PM

23

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:15:17 PM

30

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:15:18 PM

58

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:15:18 PM

62

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:15:32 PM

31

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:15:32 PM

57

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:15:32 PM

29

1265.50

XCSE

63


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:15:32 PM

25

1266.00

AQEU

GENMAB A/S

14-Apr-2025

4:15:44 PM

10

1265.00

AQEU

GENMAB A/S

14-Apr-2025

4:15:44 PM

89

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:15:49 PM

58

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:15:51 PM

6

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:16:03 PM

31

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:16:03 PM

51

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:16:03 PM

43

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:16:12 PM

4

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:16:22 PM

21

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:16:22 PM

6

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:16:23 PM

30

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:16:29 PM

40

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:16:29 PM

12

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:16:29 PM

10

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:16:29 PM

20

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:16:29 PM

11

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:16:29 PM

28

1265.00

AQEU

GENMAB A/S

14-Apr-2025

4:16:34 PM

89

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:16:34 PM

8

1264.00

TQEX

GENMAB A/S

14-Apr-2025

4:16:34 PM

25

1264.00

TQEX

GENMAB A/S

14-Apr-2025

4:16:34 PM

17

1264.00

AQEU

GENMAB A/S

14-Apr-2025

4:16:34 PM

88

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:16:51 PM

84

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:17:14 PM

29

1264.00

AQEU

GENMAB A/S

14-Apr-2025

4:17:14 PM

39

1263.50

CEUX

GENMAB A/S

14-Apr-2025

4:17:20 PM

12

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:17:20 PM

12

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:17:20 PM

13

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:17:20 PM

20

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:17:20 PM

30

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:17:23 PM

83

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:17:23 PM

2

1263.50

CEUX

GENMAB A/S

14-Apr-2025

4:17:23 PM

3

1263.50

CEUX

GENMAB A/S

14-Apr-2025

4:18:04 PM

43

1263.50

CEUX

GENMAB A/S

14-Apr-2025

4:18:14 PM

89

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:18:27 PM

40

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:18:27 PM

25

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:18:54 PM

35

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:18:54 PM

23

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:18:54 PM

40

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:18:54 PM

12

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:18:54 PM

26

1264.00

TQEX

64


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:18:54 PM

20

1264.00

TQEX

GENMAB A/S

14-Apr-2025

4:18:54 PM

33

1264.50

AQEU

GENMAB A/S

14-Apr-2025

4:18:59 PM

20

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:18:59 PM

5

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:18:59 PM

9

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:18:59 PM

3

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:18:59 PM

24

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:19:00 PM

41

1263.50

XCSE

GENMAB A/S

14-Apr-2025

4:19:24 PM

83

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:19:44 PM

87

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:20:08 PM

32

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:20:27 PM

12

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:20:53 PM

86

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:20:53 PM

52

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:20:53 PM

34

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:21:06 PM

29

1264.50

AQEU

GENMAB A/S

14-Apr-2025

4:21:10 PM

7

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:10 PM

33

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:10 PM

11

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:10 PM

13

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:10 PM

10

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:10 PM

13

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:10 PM

32

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:21:14 PM

35

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:14 PM

28

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:14 PM

40

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:14 PM

9

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:14 PM

39

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:21:14 PM

50

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:21:14 PM

34

1264.00

TQEX

GENMAB A/S

14-Apr-2025

4:21:14 PM

5

1264.00

TQEX

GENMAB A/S

14-Apr-2025

4:21:14 PM

87

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:21:34 PM

63

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:21:42 PM

85

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:47 PM

83

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:21:54 PM

86

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:22:04 PM

55

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:22:35 PM

25

1264.50

AQEU

GENMAB A/S

14-Apr-2025

4:22:43 PM

31

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:22:43 PM

32

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:22:50 PM

14

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:22:50 PM

12

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:22:50 PM

10

1264.50

XCSE

65


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:22:50 PM

40

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:22:50 PM

25

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:22:50 PM

25

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:22:50 PM

43

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:22:51 PM

37

1263.50

TQEX

GENMAB A/S

14-Apr-2025

4:23:24 PM

48

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:23:24 PM

40

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:23:24 PM

18

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:23:24 PM

1

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:23:24 PM

27

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:23:34 PM

64

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:23:34 PM

66

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:23:34 PM

21

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:23:44 PM

22

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:23:59 PM

59

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:24:02 PM

2

1263.50

AQEU

GENMAB A/S

14-Apr-2025

4:24:03 PM

2

1263.50

AQEU

GENMAB A/S

14-Apr-2025

4:24:03 PM

2

1263.50

AQEU

GENMAB A/S

14-Apr-2025

4:24:04 PM

26

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:24:04 PM

19

1263.50

AQEU

GENMAB A/S

14-Apr-2025

4:24:04 PM

30

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:24:04 PM

54

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:24:34 PM

89

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:24:34 PM

39

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:24:34 PM

45

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:25:04 PM

72

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:25:04 PM

38

1263.50

AQEU

GENMAB A/S

14-Apr-2025

4:25:24 PM

89

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:25:27 PM

15

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:25:39 PM

17

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:25:54 PM

71

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:26:31 PM

60

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:26:31 PM

27

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:26:38 PM

86

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:26:38 PM

2

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:26:54 PM

86

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:26:54 PM

25

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:26:56 PM

1

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:27:08 PM

13

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:08 PM

40

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:08 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:08 PM

13

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:08 PM

13

1267.00

XCSE

66


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:27:08 PM

85

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:27:08 PM

36

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:08 PM

5

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:08 PM

5

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:08 PM

6

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:08 PM

3

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:08 PM

20

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:09 PM

49

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:19 PM

32

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:24 PM

82

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:25 PM

38

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:27:25 PM

32

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:27:37 PM

90

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:39 PM

30

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:27:39 PM

25

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:27:54 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:54 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:27:54 PM

2

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:28:24 PM

25

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:28:27 PM

49

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:28:27 PM

14

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:28:34 PM

12

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:28:48 PM

82

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:28:49 PM

36

1267.50

CEUX

GENMAB A/S

14-Apr-2025

4:28:53 PM

100

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:28:53 PM

12

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:28:53 PM

32

1267.50

CEUX

GENMAB A/S

14-Apr-2025

4:29:07 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:29:07 PM

39

1267.50

TQEX

GENMAB A/S

14-Apr-2025

4:29:07 PM

25

1267.50

AQEU

GENMAB A/S

14-Apr-2025

4:29:09 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:29:09 PM

11

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:29:09 PM

40

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:29:09 PM

85

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:29:09 PM

32

1267.50

CEUX

GENMAB A/S

14-Apr-2025

4:29:09 PM

48

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:29:09 PM

37

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:29:34 PM

85

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:29:54 PM

74

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:30:05 PM

36

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:30:24 PM

85

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:30:27 PM

19

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:30:28 PM

12

1266.50

CEUX

67


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:30:30 PM

3

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:30:35 PM

70

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:30:42 PM

61

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:30:43 PM

16

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:30:43 PM

86

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:30:43 PM

9

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:30:43 PM

23

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:30:43 PM

27

1266.00

AQEU

GENMAB A/S

14-Apr-2025

4:30:43 PM

87

1266.00

CEUX

GENMAB A/S

14-Apr-2025

4:30:43 PM

84

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:30:50 PM

34

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:30:50 PM

23

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:30:50 PM

11

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:31:04 PM

18

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:31:04 PM

31

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:31:04 PM

9

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:31:14 PM

13

1264.00

XCSE

GENMAB A/S

14-Apr-2025

4:31:47 PM

63

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:32:13 PM

35

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:32:13 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:32:13 PM

30

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:32:13 PM

81

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:32:21 PM

47

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:32:21 PM

2

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:32:21 PM

6

1265.00

XCSE

GENMAB A/S

14-Apr-2025

4:32:27 PM

36

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:32:27 PM

5

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:32:27 PM

5

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:32:27 PM

5

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:32:34 PM

25

1264.50

TQEX

GENMAB A/S

14-Apr-2025

4:32:34 PM

63

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:32:35 PM

3

1264.50

AQEU

GENMAB A/S

14-Apr-2025

4:32:46 PM

71

1263.50

XCSE

GENMAB A/S

14-Apr-2025

4:32:51 PM

3

1264.50

AQEU

GENMAB A/S

14-Apr-2025

4:33:04 PM

20

1264.50

AQEU

GENMAB A/S

14-Apr-2025

4:33:05 PM

13

1264.50

AQEU

GENMAB A/S

14-Apr-2025

4:33:08 PM

15

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:33:12 PM

50

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:41 PM

10

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:41 PM

25

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:41 PM

51

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:41 PM

10

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:41 PM

6

1264.50

XCSE

68


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:33:41 PM

10

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:41 PM

36

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:41 PM

5

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:41 PM

5

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:41 PM

6

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:41 PM

3

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:41 PM

20

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:41 PM

5

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:41 PM

18

1264.50

CEUX

GENMAB A/S

14-Apr-2025

4:33:50 PM

69

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:50 PM

8

1264.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:50 PM

81

1263.50

XCSE

GENMAB A/S

14-Apr-2025

4:33:53 PM

9

1264.00

AQEU

GENMAB A/S

14-Apr-2025

4:33:53 PM

33

1264.00

AQEU

GENMAB A/S

14-Apr-2025

4:33:58 PM

32

1264.00

CEUX

GENMAB A/S

14-Apr-2025

4:34:02 PM

1

1263.50

XCSE

GENMAB A/S

14-Apr-2025

4:34:02 PM

34

1263.50

TQEX

GENMAB A/S

14-Apr-2025

4:34:02 PM

39

1263.50

CEUX

GENMAB A/S

14-Apr-2025

4:34:26 PM

27

1262.50

XCSE

GENMAB A/S

14-Apr-2025

4:34:26 PM

5

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:34:26 PM

6

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:34:26 PM

6

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:34:26 PM

8

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:34:30 PM

35

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:34:30 PM

10

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:34:30 PM

36

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:34:40 PM

32

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:34:40 PM

28

1262.50

CEUX

GENMAB A/S

14-Apr-2025

4:34:40 PM

8

1262.50

CEUX

GENMAB A/S

14-Apr-2025

4:34:52 PM

66

1262.50

XCSE

GENMAB A/S

14-Apr-2025

4:35:05 PM

31

1263.00

XCSE

GENMAB A/S

14-Apr-2025

4:35:07 PM

14

1263.00

CEUX

GENMAB A/S

14-Apr-2025

4:35:52 PM

11

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:35:52 PM

51

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:35:52 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:35:52 PM

12

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:35:52 PM

25

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:35:54 PM

18

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:35:59 PM

36

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:36:00 PM

36

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:36:01 PM

35

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:01 PM

29

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:01 PM

35

1265.50

XCSE

69


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:36:01 PM

12

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:01 PM

13

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:36:24 PM

88

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:24 PM

87

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:36:40 PM

28

1265.50

AQEU

GENMAB A/S

14-Apr-2025

4:36:44 PM

5

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:36:44 PM

36

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:36:44 PM

21

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:36:50 PM

10

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:50 PM

11

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:50 PM

51

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:50 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:50 PM

12

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:36:50 PM

10

1265.00

TQEX

GENMAB A/S

14-Apr-2025

4:36:50 PM

20

1265.00

CEUX

GENMAB A/S

14-Apr-2025

4:37:04 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:04 PM

51

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:04 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:04 PM

15

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:04 PM

32

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:37:05 PM

35

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:05 PM

31

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:05 PM

31

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:34 PM

82

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:35 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:35 PM

13

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:35 PM

11

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:35 PM

15

1265.50

XCSE

GENMAB A/S

14-Apr-2025

4:37:35 PM

40

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:37:37 PM

42

1265.50

CEUX

GENMAB A/S

14-Apr-2025

4:38:03 PM

4

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:38:04 PM

28

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:04 PM

82

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:38:28 PM

30

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:38:40 PM

83

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:40 PM

4

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

2

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

2

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

2

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

3

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

3

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

5

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

5

1266.50

TQEX

70


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:38:40 PM

5

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

5

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:38:40 PM

36

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:38:40 PM

3

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:38:40 PM

4

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:38:40 PM

37

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:38:41 PM

47

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:46 PM

33

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:46 PM

51

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:47 PM

47

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:47 PM

36

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:38:47 PM

6

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:38:52 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:52 PM

32

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:52 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:52 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:52 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:38:52 PM

14

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:39:00 PM

18

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:39:00 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:39:00 PM

11

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:39:00 PM

12

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:39:00 PM

35

1267.00

XCSE

GENMAB A/S

14-Apr-2025

4:39:00 PM

55

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:39:08 PM

37

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:39:08 PM

55

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:39:14 PM

88

1266.00

XCSE

GENMAB A/S

14-Apr-2025

4:39:31 PM

25

1267.00

AQEU

GENMAB A/S

14-Apr-2025

4:39:40 PM

49

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:39:40 PM

35

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:39:40 PM

5

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:39:40 PM

61

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:39:40 PM

25

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:39:47 PM

13

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:40:05 PM

37

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:40:13 PM

82

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:40:15 PM

4

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:40:15 PM

38

1266.50

TQEX

GENMAB A/S

14-Apr-2025

4:40:15 PM

48

1266.50

AQEU

GENMAB A/S

14-Apr-2025

4:40:30 PM

32

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:40:30 PM

10

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:40:30 PM

11

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:40:30 PM

12

1266.50

XCSE

71


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:40:30 PM

47

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:40:31 PM

6

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:40:31 PM

5

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:40:31 PM

6

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:40:31 PM

11

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:40:41 PM

36

1266.50

CEUX

GENMAB A/S

14-Apr-2025

4:40:54 PM

78

1266.50

XCSE

GENMAB A/S

14-Apr-2025

4:40:54 PM

32

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:40:54 PM

33

1267.00

CEUX

GENMAB A/S

14-Apr-2025

4:41:31 PM

70

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:41:31 PM

13

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:41:31 PM

86

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:41:31 PM

85

1267.50

XCSE

GENMAB A/S

14-Apr-2025

4:41:31 PM

86

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:41:38 PM

5

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:41:56 PM

11

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:41:56 PM

13

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:41:56 PM

51

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:41:58 PM

13

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:14 PM

11

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:14 PM

12

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:15 PM

26

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:15 PM

36

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:15 PM

5

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:15 PM

5

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:15 PM

6

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:42:15 PM

5

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:42:15 PM

14

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:42:16 PM

6

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:16 PM

5

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:17 PM

4

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:17 PM

6

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:19 PM

39

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:42:20 PM

48

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:25 PM

11

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:25 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:25 PM

51

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:25 PM

11

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:29 PM

31

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:29 PM

39

1268.50

AQEU

GENMAB A/S

14-Apr-2025

4:42:40 PM

37

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:45 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:45 PM

12

1269.00

XCSE

72


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:42:45 PM

11

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:45 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:45 PM

2

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:42:45 PM

29

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:45 PM

4

1268.50

TQEX

GENMAB A/S

14-Apr-2025

4:42:45 PM

9

1268.50

TQEX

GENMAB A/S

14-Apr-2025

4:42:45 PM

4

1268.50

TQEX

GENMAB A/S

14-Apr-2025

4:42:45 PM

7

1268.50

TQEX

GENMAB A/S

14-Apr-2025

4:42:54 PM

17

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:57 PM

13

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:57 PM

11

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:57 PM

13

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:42:57 PM

26

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:43:00 PM

25

1269.50

TQEX

GENMAB A/S

14-Apr-2025

4:43:00 PM

8

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:43:02 PM

31

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:43:14 PM

63

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:43:14 PM

75

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:43:14 PM

3

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:43:14 PM

36

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:43:14 PM

11

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:43:14 PM

36

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:43:16 PM

42

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:43:18 PM

14

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:43:48 PM

69

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:44:04 PM

15

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:44:21 PM

89

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:44:21 PM

32

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:44:22 PM

17

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:44:22 PM

26

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:44:26 PM

7

1269.00

TQEX

GENMAB A/S

14-Apr-2025

4:44:26 PM

65

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:44:27 PM

14

1269.00

TQEX

GENMAB A/S

14-Apr-2025

4:44:42 PM

2

1269.00

TQEX

GENMAB A/S

14-Apr-2025

4:44:44 PM

3

1269.00

TQEX

GENMAB A/S

14-Apr-2025

4:45:03 PM

29

1268.00

CEUX

GENMAB A/S

14-Apr-2025

4:45:03 PM

15

1268.50

AQEU

GENMAB A/S

14-Apr-2025

4:45:11 PM

51

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:11 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:11 PM

21

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:11 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:11 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:11 PM

5

1269.00

XCSE

73


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:45:11 PM

10

1268.50

AQEU

GENMAB A/S

14-Apr-2025

4:45:12 PM

49

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

30

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

33

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

18

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

13

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

30

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

51

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

12

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:12 PM

5

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:28 PM

66

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:43 PM

10

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:45:43 PM

33

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:45:54 PM

73

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:46:03 PM

31

1270.00

TQEX

GENMAB A/S

14-Apr-2025

4:46:03 PM

3

1270.00

TQEX

GENMAB A/S

14-Apr-2025

4:46:14 PM

16

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:46:23 PM

89

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:46:23 PM

21

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:46:34 PM

85

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:46:35 PM

7

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:46:42 PM

27

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:46:51 PM

35

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:46:54 PM

61

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:46:54 PM

50

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:46:54 PM

21

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:46:57 PM

22

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:46:58 PM

59

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:01 PM

6

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:14 PM

86

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:19 PM

12

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:19 PM

10

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:19 PM

10

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:19 PM

21

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:19 PM

35

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:19 PM

24

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:19 PM

19

1270.00

TQEX

74


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:47:19 PM

19

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:47:19 PM

1

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:47:20 PM

35

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:20 PM

31

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:20 PM

11

1270.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:20 PM

35

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:47:20 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:20 PM

1

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:20 PM

26

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:20 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:21 PM

36

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:21 PM

5

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:21 PM

5

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:22 PM

6

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:22 PM

5

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:22 PM

5

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:22 PM

9

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:22 PM

32

1270.50

CEUX

GENMAB A/S

14-Apr-2025

4:47:24 PM

5

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:47:24 PM

46

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:47:24 PM

12

1270.00

TQEX

GENMAB A/S

14-Apr-2025

4:47:24 PM

14

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:47:24 PM

34

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:47:25 PM

15

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:47:25 PM

1

1270.00

CEUX

GENMAB A/S

14-Apr-2025

4:47:27 PM

53

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:54 PM

72

1269.50

XCSE

GENMAB A/S

14-Apr-2025

4:47:54 PM

10

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:47:54 PM

13

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:47:54 PM

64

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:47:54 PM

23

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:47:54 PM

6

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:47:55 PM

2

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:47:59 PM

4

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:48:04 PM

3

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:48:09 PM

3

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:48:14 PM

3

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:48:17 PM

5

1269.50

AQEU

GENMAB A/S

14-Apr-2025

4:48:18 PM

82

1268.50

XCSE

GENMAB A/S

14-Apr-2025

4:48:18 PM

2

1269.00

TQEX

GENMAB A/S

14-Apr-2025

4:48:18 PM

3

1269.50

CEUX

GENMAB A/S

14-Apr-2025

4:48:18 PM

1

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:48:19 PM

20

1269.00

TQEX

75


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:48:19 PM

2

1269.00

TQEX

GENMAB A/S

14-Apr-2025

4:48:24 PM

1

1269.00

TQEX

GENMAB A/S

14-Apr-2025

4:48:29 PM

10

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:48:34 PM

79

1269.00

XCSE

GENMAB A/S

14-Apr-2025

4:48:41 PM

2

1269.00

CEUX

GENMAB A/S

14-Apr-2025

4:49:00 PM

88

1270.00

XCSE

GENMAB A/S

14-Apr-2025

4:49:06 PM

64

1271.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:06 PM

13

1271.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:06 PM

36

1271.50

CEUX

GENMAB A/S

14-Apr-2025

4:49:06 PM

2

1271.50

CEUX

GENMAB A/S

14-Apr-2025

4:49:06 PM

29

1271.50

CEUX

GENMAB A/S

14-Apr-2025

4:49:07 PM

100

1271.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:14 PM

25

1271.00

TQEX

GENMAB A/S

14-Apr-2025

4:49:14 PM

43

1271.00

CEUX

GENMAB A/S

14-Apr-2025

4:49:14 PM

1

1271.00

CEUX

GENMAB A/S

14-Apr-2025

4:49:14 PM

40

1271.00

CEUX

GENMAB A/S

14-Apr-2025

4:49:38 PM

53

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:48 PM

34

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:49:48 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:49:49 PM

66

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

15

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

2

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

13

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

11

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

64

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

7

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

48

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:49:49 PM

25

1273.00

TQEX

GENMAB A/S

14-Apr-2025

4:49:49 PM

44

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:49:49 PM

36

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:49:49 PM

26

1273.50

AQEU

GENMAB A/S

14-Apr-2025

4:50:00 PM

13

1273.50

TQEX

GENMAB A/S

14-Apr-2025

4:50:04 PM

16

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:04 PM

14

1273.50

TQEX

GENMAB A/S

14-Apr-2025

4:50:12 PM

35

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:12 PM

33

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:12 PM

44

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:12 PM

47

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:50:12 PM

4

1272.50

TQEX

GENMAB A/S

14-Apr-2025

4:50:12 PM

2

1272.50

TQEX

GENMAB A/S

14-Apr-2025

4:50:12 PM

4

1272.50

TQEX

GENMAB A/S

14-Apr-2025

4:50:12 PM

2

1272.50

TQEX

GENMAB A/S

14-Apr-2025

4:50:12 PM

4

1272.50

TQEX

76


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:50:12 PM

10

1272.50

TQEX

GENMAB A/S

14-Apr-2025

4:50:12 PM

7

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

36

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

8

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

4

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

15

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

40

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

2

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

13

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

7

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

9

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:12 PM

35

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:50:31 PM

51

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:50:31 PM

10

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:31 PM

13

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:31 PM

11

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:31 PM

32

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:31 PM

6

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:31 PM

6

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:31 PM

5

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:34 PM

6

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:34 PM

6

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:34 PM

5

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:50:48 PM

3

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:50:48 PM

64

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:50:48 PM

13

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:50:48 PM

8

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:50:48 PM

47

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:50:48 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:48 PM

20

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:50 PM

9

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:50:53 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:53 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:50:53 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:14 PM

61

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:51:33 PM

55

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:39 PM

42

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:51:39 PM

40

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:51:39 PM

36

1274.00

CEUX

GENMAB A/S

14-Apr-2025

4:51:39 PM

5

1274.00

CEUX

GENMAB A/S

14-Apr-2025

4:51:39 PM

6

1274.00

CEUX

GENMAB A/S

14-Apr-2025

4:51:39 PM

6

1274.00

CEUX

GENMAB A/S

14-Apr-2025

4:51:40 PM

20

1273.50

CEUX

77


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:51:46 PM

36

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

36

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

36

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:46 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:47 PM

32

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:51:47 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:47 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:47 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:47 PM

36

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:47 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:47 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:47 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:51:52 PM

57

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:51:52 PM

57

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:00 PM

25

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:00 PM

13

1273.00

AQEU

GENMAB A/S

14-Apr-2025

4:52:10 PM

85

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:52:11 PM

12

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:11 PM

10

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:11 PM

13

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:11 PM

64

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:11 PM

11

1273.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:12 PM

41

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:52:13 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:13 PM

6

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:13 PM

5

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:13 PM

20

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:24 PM

27

1271.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:24 PM

39

1272.50

TQEX

GENMAB A/S

14-Apr-2025

4:52:24 PM

10

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:24 PM

30

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:24 PM

2

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:52:24 PM

2

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:52:24 PM

2

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:52:25 PM

15

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:52:25 PM

2

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:52:25 PM

3

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:52:25 PM

2

1272.50

AQEU

78


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:52:25 PM

7

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:52:27 PM

13

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:31 PM

15

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:52:34 PM

9

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:52:34 PM

6

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:52:34 PM

6

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:52:34 PM

23

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:34 PM

8

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:52:35 PM

14

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:53:02 PM

64

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:53:02 PM

11

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:53:02 PM

11

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:53:02 PM

11

1272.50

XCSE

GENMAB A/S

14-Apr-2025

4:53:02 PM

36

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:53:02 PM

6

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:53:02 PM

6

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:53:02 PM

6

1272.50

CEUX

GENMAB A/S

14-Apr-2025

4:53:02 PM

1

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:53:02 PM

20

1272.50

AQEU

GENMAB A/S

14-Apr-2025

4:53:04 PM

20

1273.00

CEUX

GENMAB A/S

14-Apr-2025

4:53:14 PM

82

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:53:30 PM

22

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:04 PM

83

1274.50

TQEX

GENMAB A/S

14-Apr-2025

4:54:04 PM

29

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:07 PM

69

1274.00

XCSE

GENMAB A/S

14-Apr-2025

4:54:07 PM

15

1274.00

XCSE

GENMAB A/S

14-Apr-2025

4:54:07 PM

36

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:07 PM

56

1274.50

AQEU

GENMAB A/S

14-Apr-2025

4:54:08 PM

64

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:08 PM

11

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:08 PM

13

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:08 PM

64

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:08 PM

13

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:08 PM

11

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:08 PM

36

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:08 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:08 PM

5

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:08 PM

6

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:08 PM

20

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:09 PM

1

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:09 PM

11

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:09 PM

31

1274.50

XCSE

GENMAB A/S

14-Apr-2025

4:54:09 PM

64

1274.50

XCSE

79


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

14-Apr-2025

4:54:18 PM

49

1274.00

XCSE

GENMAB A/S

14-Apr-2025

4:54:18 PM

40

1274.00

XCSE

GENMAB A/S

14-Apr-2025

4:54:18 PM

36

1274.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:30 PM

80

1274.00

XCSE

GENMAB A/S

14-Apr-2025

4:54:30 PM

9

1274.00

XCSE

GENMAB A/S

14-Apr-2025

4:54:32 PM

30

1273.50

CEUX

GENMAB A/S

14-Apr-2025

4:54:42 PM

88

1273.00

XCSE

GENMAB A/S

14-Apr-2025

4:54:48 PM

1

1274.00

XCSE

GENMAB A/S

15-Apr-2025

9:41:56 AM

89

1292.00

CEUX

GENMAB A/S

15-Apr-2025

9:42:03 AM

80

1291.50

XCSE

GENMAB A/S

15-Apr-2025

9:42:03 AM

72

1291.50

TQEX

GENMAB A/S

15-Apr-2025

9:42:29 AM

60

1291.50

XCSE

GENMAB A/S

15-Apr-2025

9:42:29 AM

53

1291.50

TQEX

GENMAB A/S

15-Apr-2025

9:42:29 AM

78

1291.00

CEUX

GENMAB A/S

15-Apr-2025

9:42:29 AM

83

1291.00

AQEU

GENMAB A/S

15-Apr-2025

9:42:30 AM

77

1290.50

XCSE

GENMAB A/S

15-Apr-2025

9:45:16 AM

5

1290.50

XCSE

GENMAB A/S

15-Apr-2025

9:45:16 AM

27

1290.50

XCSE

GENMAB A/S

15-Apr-2025

9:45:30 AM

27

1291.00

XCSE

GENMAB A/S

15-Apr-2025

9:46:20 AM

25

1292.50

XCSE

GENMAB A/S

15-Apr-2025

9:46:20 AM

10

1292.00

AQEU

GENMAB A/S

15-Apr-2025

9:46:30 AM

16

1292.00

AQEU

GENMAB A/S

15-Apr-2025

9:47:20 AM

21

1293.50

AQEU

GENMAB A/S

15-Apr-2025

9:47:30 AM

43

1294.00

TQEX

GENMAB A/S

15-Apr-2025

9:47:48 AM

62

1294.00

XCSE

GENMAB A/S

15-Apr-2025

9:50:14 AM

62

1294.00

XCSE

GENMAB A/S

15-Apr-2025

9:50:14 AM

40

1293.00

XCSE

GENMAB A/S

15-Apr-2025

9:50:14 AM

43

1293.00

TQEX

GENMAB A/S

15-Apr-2025

9:50:14 AM

34

1292.00

TQEX

GENMAB A/S

15-Apr-2025

9:50:14 AM

84

1294.00

CEUX

GENMAB A/S

15-Apr-2025

9:50:14 AM

85

1293.00

CEUX

GENMAB A/S

15-Apr-2025

9:50:14 AM

8

1292.00

CEUX

GENMAB A/S

15-Apr-2025

9:50:14 AM

66

1292.00

CEUX

GENMAB A/S

15-Apr-2025

9:50:14 AM

23

1293.50

AQEU

GENMAB A/S

15-Apr-2025

9:50:14 AM

44

1292.50

AQEU

GENMAB A/S

15-Apr-2025

9:50:20 AM

6

1292.00

TQEX

GENMAB A/S

15-Apr-2025

9:50:20 AM

19

1292.00

CEUX

GENMAB A/S

15-Apr-2025

9:50:21 AM

22

1292.00

AQEU

GENMAB A/S

15-Apr-2025

9:50:22 AM

38

1292.00

CEUX

GENMAB A/S

15-Apr-2025

9:51:08 AM

28

1292.00

CEUX

GENMAB A/S

15-Apr-2025

9:53:07 AM

30

1291.50

XCSE

GENMAB A/S

15-Apr-2025

9:53:07 AM

4

1291.50

XCSE

GENMAB A/S

15-Apr-2025

9:53:39 AM

22

1290.50

CEUX

80


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

9:54:11 AM

22

1290.50

CEUX

GENMAB A/S

15-Apr-2025

9:55:10 AM

22

1290.50

CEUX

GENMAB A/S

15-Apr-2025

9:56:53 AM

24

1291.00

AQEU

GENMAB A/S

15-Apr-2025

9:56:53 AM

3

1291.00

AQEU

GENMAB A/S

15-Apr-2025

9:57:09 AM

39

1290.50

XCSE

GENMAB A/S

15-Apr-2025

9:57:09 AM

36

1291.00

TQEX

GENMAB A/S

15-Apr-2025

9:57:09 AM

24

1290.50

CEUX

GENMAB A/S

15-Apr-2025

9:57:09 AM

30

1291.00

AQEU

GENMAB A/S

15-Apr-2025

9:57:26 AM

87

1290.00

XCSE

GENMAB A/S

15-Apr-2025

9:59:40 AM

25

1292.00

CEUX

GENMAB A/S

15-Apr-2025

9:59:51 AM

89

1292.50

XCSE

GENMAB A/S

15-Apr-2025

9:59:51 AM

29

1292.50

XCSE

GENMAB A/S

15-Apr-2025

9:59:51 AM

13

1292.50

XCSE

GENMAB A/S

15-Apr-2025

9:59:51 AM

16

1292.50

XCSE

GENMAB A/S

15-Apr-2025

9:59:51 AM

30

1292.50

TQEX

GENMAB A/S

15-Apr-2025

9:59:51 AM

13

1292.50

TQEX

GENMAB A/S

15-Apr-2025

9:59:51 AM

7

1292.50

CEUX

GENMAB A/S

15-Apr-2025

9:59:51 AM

8

1292.50

CEUX

GENMAB A/S

15-Apr-2025

9:59:51 AM

1

1292.50

AQEU

GENMAB A/S

15-Apr-2025

9:59:51 AM

1

1292.50

AQEU

GENMAB A/S

15-Apr-2025

9:59:52 AM

7

1292.50

CEUX

GENMAB A/S

15-Apr-2025

9:59:57 AM

15

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:00 AM

15

1292.50

CEUX

GENMAB A/S

15-Apr-2025

10:00:00 AM

8

1292.50

AQEU

GENMAB A/S

15-Apr-2025

10:00:09 AM

45

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:09 AM

40

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:09 AM

47

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:09 AM

25

1293.00

TQEX

GENMAB A/S

15-Apr-2025

10:00:09 AM

89

1293.00

CEUX

GENMAB A/S

15-Apr-2025

10:00:13 AM

24

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:13 AM

15

1292.50

AQEU

GENMAB A/S

15-Apr-2025

10:00:15 AM

66

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:00:16 AM

90

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:16 AM

35

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:16 AM

38

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:16 AM

19

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:16 AM

22

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:16 AM

33

1291.50

TQEX

GENMAB A/S

15-Apr-2025

10:00:17 AM

84

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:18 AM

15

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:18 AM

57

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:18 AM

47

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:00:26 AM

38

1291.00

XCSE

81


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

10:00:26 AM

35

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:26 AM

16

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:26 AM

16

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:26 AM

57

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:26 AM

34

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:00:26 AM

68

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:00:26 AM

23

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:00:26 AM

27

1291.00

AQEU

GENMAB A/S

15-Apr-2025

10:01:21 AM

84

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:01:28 AM

24

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:02:45 AM

25

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:02:52 AM

51

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:03:09 AM

26

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

38

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

13

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

15

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

22

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

16

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

17

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

26

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:09 AM

14

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:03:59 AM

91

1294.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:59 AM

32

1294.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:59 AM

13

1294.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:59 AM

39

1294.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:59 AM

30

1294.50

XCSE

GENMAB A/S

15-Apr-2025

10:03:59 AM

88

1294.00

CEUX

GENMAB A/S

15-Apr-2025

10:03:59 AM

35

1294.50

AQEU

GENMAB A/S

15-Apr-2025

10:04:12 AM

86

1293.50

XCSE

GENMAB A/S

15-Apr-2025

10:04:12 AM

26

1293.50

AQEU

GENMAB A/S

15-Apr-2025

10:04:36 AM

90

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:04:36 AM

89

1293.00

CEUX

GENMAB A/S

15-Apr-2025

10:04:36 AM

15

1292.50

AQEU

GENMAB A/S

15-Apr-2025

10:04:36 AM

10

1292.50

AQEU

GENMAB A/S

15-Apr-2025

10:04:45 AM

25

1292.00

TQEX

GENMAB A/S

15-Apr-2025

10:04:45 AM

89

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:04:47 AM

86

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:05:22 AM

15

1290.50

CEUX

GENMAB A/S

15-Apr-2025

10:06:03 AM

3

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:06:41 AM

50

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:06:41 AM

31

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:06:41 AM

78

1291.50

CEUX

GENMAB A/S

15-Apr-2025

10:07:21 AM

37

1290.00

XCSE

82


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

10:07:21 AM

61

1290.50

CEUX

GENMAB A/S

15-Apr-2025

10:07:21 AM

13

1290.50

CEUX

GENMAB A/S

15-Apr-2025

10:07:40 AM

37

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:07:40 AM

9

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:09:21 AM

87

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:10:05 AM

39

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:10:05 AM

27

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:10:05 AM

20

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:10:05 AM

28

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:10:05 AM

25

1291.00

TQEX

GENMAB A/S

15-Apr-2025

10:10:07 AM

52

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:10:07 AM

25

1291.00

AQEU

GENMAB A/S

15-Apr-2025

10:11:07 AM

22

1291.50

CEUX

GENMAB A/S

15-Apr-2025

10:11:21 AM

90

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:11:21 AM

63

1291.50

CEUX

GENMAB A/S

15-Apr-2025

10:11:26 AM

58

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:11:28 AM

44

1290.50

CEUX

GENMAB A/S

15-Apr-2025

10:11:46 AM

48

1290.00

XCSE

GENMAB A/S

15-Apr-2025

10:11:46 AM

25

1290.00

TQEX

GENMAB A/S

15-Apr-2025

10:11:46 AM

37

1290.00

AQEU

GENMAB A/S

15-Apr-2025

10:11:47 AM

80

1289.50

CEUX

GENMAB A/S

15-Apr-2025

10:12:03 AM

16

1289.50

XCSE

GENMAB A/S

15-Apr-2025

10:12:03 AM

19

1289.50

XCSE

GENMAB A/S

15-Apr-2025

10:12:03 AM

30

1289.50

XCSE

GENMAB A/S

15-Apr-2025

10:12:12 AM

16

1290.00

XCSE

GENMAB A/S

15-Apr-2025

10:12:12 AM

15

1290.00

TQEX

GENMAB A/S

15-Apr-2025

10:13:20 AM

13

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:13:20 AM

24

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:13:20 AM

15

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:13:50 AM

31

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:14:11 AM

25

1292.50

AQEU

GENMAB A/S

15-Apr-2025

10:14:50 AM

67

1293.50

XCSE

GENMAB A/S

15-Apr-2025

10:14:50 AM

24

1293.50

XCSE

GENMAB A/S

15-Apr-2025

10:15:10 AM

84

1293.00

XCSE

GENMAB A/S

15-Apr-2025

10:15:10 AM

26

1293.00

TQEX

GENMAB A/S

15-Apr-2025

10:15:10 AM

23

1293.00

CEUX

GENMAB A/S

15-Apr-2025

10:15:10 AM

61

1293.00

CEUX

GENMAB A/S

15-Apr-2025

10:15:10 AM

28

1292.50

AQEU

GENMAB A/S

15-Apr-2025

10:15:31 AM

58

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:15:31 AM

25

1292.00

TQEX

GENMAB A/S

15-Apr-2025

10:15:31 AM

85

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:15:32 AM

91

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:15:32 AM

89

1291.00

XCSE

83


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

10:15:32 AM

79

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:15:46 AM

89

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:17:51 AM

21

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:18:31 AM

82

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:18:31 AM

3

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:18:31 AM

15

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:18:31 AM

28

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:18:50 AM

11

1292.00

TQEX

GENMAB A/S

15-Apr-2025

10:18:50 AM

20

1292.00

TQEX

GENMAB A/S

15-Apr-2025

10:18:50 AM

89

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:18:50 AM

28

1292.00

AQEU

GENMAB A/S

15-Apr-2025

10:19:00 AM

90

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:20:43 AM

16

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:20:43 AM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:21:11 AM

84

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:21:11 AM

29

1291.50

TQEX

GENMAB A/S

15-Apr-2025

10:21:11 AM

7

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:21:11 AM

6

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:21:11 AM

18

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:21:11 AM

8

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:21:11 AM

28

1291.50

AQEU

GENMAB A/S

15-Apr-2025

10:22:25 AM

89

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:24:12 AM

15

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:24:12 AM

15

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:24:12 AM

34

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:24:12 AM

50

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:24:17 AM

13

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:24:17 AM

39

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:24:17 AM

31

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:25:01 AM

57

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:25:01 AM

20

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:25:01 AM

86

1292.00

XCSE

GENMAB A/S

15-Apr-2025

10:25:01 AM

87

1292.00

CEUX

GENMAB A/S

15-Apr-2025

10:25:01 AM

26

1292.00

AQEU

GENMAB A/S

15-Apr-2025

10:27:31 AM

54

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:27:31 AM

89

1291.00

CEUX

GENMAB A/S

15-Apr-2025

10:27:31 AM

25

1291.00

AQEU

GENMAB A/S

15-Apr-2025

10:28:21 AM

31

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:29:20 AM

59

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:29:20 AM

14

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:29:20 AM

15

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:01 AM

32

1289.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:01 AM

89

1290.00

CEUX

84


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

10:30:01 AM

32

1290.50

CEUX

GENMAB A/S

15-Apr-2025

10:30:06 AM

2

1291.00

TQEX

GENMAB A/S

15-Apr-2025

10:30:06 AM

6

1291.00

TQEX

GENMAB A/S

15-Apr-2025

10:30:06 AM

2

1291.00

TQEX

GENMAB A/S

15-Apr-2025

10:30:06 AM

10

1291.00

TQEX

GENMAB A/S

15-Apr-2025

10:30:06 AM

88

1291.50

CEUX

GENMAB A/S

15-Apr-2025

10:30:07 AM

49

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:07 AM

16

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:07 AM

46

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:45 AM

50

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:45 AM

5

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:45 AM

23

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:45 AM

15

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:45 AM

21

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:30:45 AM

10

1291.00

TQEX

GENMAB A/S

15-Apr-2025

10:30:45 AM

25

1291.00

AQEU

GENMAB A/S

15-Apr-2025

10:31:03 AM

49

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:31:03 AM

11

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:31:53 AM

16

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:32:45 AM

31

1291.00

TQEX

GENMAB A/S

15-Apr-2025

10:32:45 AM

8

1291.00

AQEU

GENMAB A/S

15-Apr-2025

10:32:49 AM

90

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:32:49 AM

13

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:32:49 AM

13

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:32:49 AM

39

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:32:49 AM

34

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:32:49 AM

15

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:32:49 AM

85

1290.50

CEUX

GENMAB A/S

15-Apr-2025

10:33:29 AM

6

1290.00

TQEX

GENMAB A/S

15-Apr-2025

10:33:29 AM

19

1290.00

TQEX

GENMAB A/S

15-Apr-2025

10:34:24 AM

88

1290.00

XCSE

GENMAB A/S

15-Apr-2025

10:34:51 AM

55

1289.50

XCSE

GENMAB A/S

15-Apr-2025

10:36:29 AM

32

1290.00

CEUX

GENMAB A/S

15-Apr-2025

10:36:30 AM

45

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:36:30 AM

8

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:36:30 AM

32

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:37:05 AM

42

1290.50

XCSE

GENMAB A/S

15-Apr-2025

10:37:05 AM

8

1290.50

CEUX

GENMAB A/S

15-Apr-2025

10:39:00 AM

28

1291.50

TQEX

GENMAB A/S

15-Apr-2025

10:39:52 AM

13

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:39:52 AM

9

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:39:52 AM

15

1291.50

XCSE

GENMAB A/S

15-Apr-2025

10:39:52 AM

15

1291.50

XCSE

85


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

10:39:52 AM

65

1291.00

XCSE

GENMAB A/S

15-Apr-2025

10:39:52 AM

36

1291.50

CEUX

GENMAB A/S

15-Apr-2025

10:39:52 AM

1

1291.50

CEUX

GENMAB A/S

15-Apr-2025

10:39:52 AM

25

1291.50

CEUX

GENMAB A/S

15-Apr-2025

10:41:31 AM

22

1294.50

XCSE

GENMAB A/S

15-Apr-2025

10:41:32 AM

28

1295.00

XCSE

GENMAB A/S

15-Apr-2025

10:41:32 AM

40

1295.00

XCSE

GENMAB A/S

15-Apr-2025

10:41:46 AM

28

1295.50

TQEX

GENMAB A/S

15-Apr-2025

10:42:04 AM

12

1295.00

XCSE

GENMAB A/S

15-Apr-2025

10:42:06 AM

79

1295.00

XCSE

GENMAB A/S

15-Apr-2025

10:42:06 AM

39

1295.00

AQEU

GENMAB A/S

15-Apr-2025

10:42:12 AM

30

1294.50

TQEX

GENMAB A/S

15-Apr-2025

10:42:12 AM

22

1294.50

CEUX

GENMAB A/S

15-Apr-2025

10:42:12 AM

66

1294.50

CEUX

GENMAB A/S

15-Apr-2025

10:42:12 AM

20

1294.50

CEUX

GENMAB A/S

15-Apr-2025

10:42:13 AM

35

1295.00

XCSE

GENMAB A/S

15-Apr-2025

10:42:13 AM

16

1295.00

XCSE

GENMAB A/S

15-Apr-2025

10:43:49 AM

21

1296.00

CEUX

GENMAB A/S

15-Apr-2025

10:43:55 AM

16

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:45:05 AM

45

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:45:05 AM

25

1297.00

TQEX

GENMAB A/S

15-Apr-2025

10:45:05 AM

90

1297.00

CEUX

GENMAB A/S

15-Apr-2025

10:45:05 AM

9

1297.00

CEUX

GENMAB A/S

15-Apr-2025

10:45:05 AM

24

1297.00

CEUX

GENMAB A/S

15-Apr-2025

10:45:07 AM

4

1297.00

CEUX

GENMAB A/S

15-Apr-2025

10:45:08 AM

86

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

56

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

39

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

14

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

5

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

8

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

13

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

44

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:45:08 AM

32

1296.50

CEUX

GENMAB A/S

15-Apr-2025

10:45:08 AM

22

1296.50

AQEU

GENMAB A/S

15-Apr-2025

10:45:08 AM

13

1296.50

AQEU

GENMAB A/S

15-Apr-2025

10:45:43 AM

18

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:46:43 AM

24

1296.50

AQEU

GENMAB A/S

15-Apr-2025

10:47:31 AM

88

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:48:14 AM

50

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:48:14 AM

36

1296.50

CEUX

GENMAB A/S

15-Apr-2025

10:48:18 AM

36

1296.50

CEUX

GENMAB A/S

15-Apr-2025

10:48:23 AM

54

1296.00

XCSE

86


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

10:48:23 AM

35

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:48:23 AM

15

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:48:23 AM

10

1296.50

XCSE

GENMAB A/S

15-Apr-2025

10:48:23 AM

10

1295.50

TQEX

GENMAB A/S

15-Apr-2025

10:48:23 AM

36

1296.50

CEUX

GENMAB A/S

15-Apr-2025

10:48:23 AM

68

1296.00

CEUX

GENMAB A/S

15-Apr-2025

10:48:23 AM

1

1296.00

CEUX

GENMAB A/S

15-Apr-2025

10:48:23 AM

23

1295.50

AQEU

GENMAB A/S

15-Apr-2025

10:48:29 AM

88

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:48:48 AM

87

1294.00

XCSE

GENMAB A/S

15-Apr-2025

10:48:48 AM

85

1293.50

XCSE

GENMAB A/S

15-Apr-2025

10:48:48 AM

90

1294.50

CEUX

GENMAB A/S

15-Apr-2025

10:48:48 AM

15

1294.50

CEUX

GENMAB A/S

15-Apr-2025

10:48:48 AM

76

1294.50

CEUX

GENMAB A/S

15-Apr-2025

10:48:48 AM

85

1293.50

CEUX

GENMAB A/S

15-Apr-2025

10:49:28 AM

89

1292.50

XCSE

GENMAB A/S

15-Apr-2025

10:49:28 AM

87

1292.50

CEUX

GENMAB A/S

15-Apr-2025

10:51:03 AM

86

1293.50

XCSE

GENMAB A/S

15-Apr-2025

10:51:03 AM

35

1293.50

TQEX

GENMAB A/S

15-Apr-2025

10:51:03 AM

79

1293.50

CEUX

GENMAB A/S

15-Apr-2025

10:51:03 AM

35

1294.00

AQEU

GENMAB A/S

15-Apr-2025

10:53:27 AM

72

1294.50

CEUX

GENMAB A/S

15-Apr-2025

10:54:33 AM

43

1294.50

XCSE

GENMAB A/S

15-Apr-2025

10:57:19 AM

29

1295.00

TQEX

GENMAB A/S

15-Apr-2025

10:57:51 AM

64

1294.00

XCSE

GENMAB A/S

15-Apr-2025

10:58:00 AM

30

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:58:00 AM

14

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:58:00 AM

14

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:58:00 AM

34

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:58:00 AM

15

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:58:01 AM

15

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:58:01 AM

15

1295.50

XCSE

GENMAB A/S

15-Apr-2025

10:59:47 AM

7

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:59:47 AM

14

1297.00

XCSE

GENMAB A/S

15-Apr-2025

10:59:47 AM

93

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:00:00 AM

35

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:00:00 AM

14

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:00:00 AM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:00:00 AM

50

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:00:53 AM

30

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:00:53 AM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:02:01 AM

42

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:02:01 AM

69

1297.00

XCSE

87


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

11:02:01 AM

25

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:02:01 AM

24

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:02:01 AM

42

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:02:01 AM

27

1297.00

TQEX

GENMAB A/S

15-Apr-2025

11:02:06 AM

32

1296.50

AQEU

GENMAB A/S

15-Apr-2025

11:02:06 AM

3

1296.50

AQEU

GENMAB A/S

15-Apr-2025

11:02:06 AM

87

1296.50

CEUX

GENMAB A/S

15-Apr-2025

11:02:36 AM

71

1296.00

XCSE

GENMAB A/S

15-Apr-2025

11:02:36 AM

18

1296.00

XCSE

GENMAB A/S

15-Apr-2025

11:02:36 AM

26

1296.00

TQEX

GENMAB A/S

15-Apr-2025

11:05:11 AM

84

1296.00

XCSE

GENMAB A/S

15-Apr-2025

11:06:05 AM

13

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:06:05 AM

42

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:06:05 AM

4

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:06:05 AM

36

1297.00

CEUX

GENMAB A/S

15-Apr-2025

11:06:15 AM

90

1297.00

XCSE

GENMAB A/S

15-Apr-2025

11:06:15 AM

90

1297.50

XCSE

GENMAB A/S

15-Apr-2025

11:06:15 AM

85

1298.00

CEUX

GENMAB A/S

15-Apr-2025

11:07:13 AM

25

1298.00

CEUX

GENMAB A/S

15-Apr-2025

11:09:04 AM

62

1298.00

XCSE

GENMAB A/S

15-Apr-2025

11:09:23 AM

28

1298.50

XCSE

GENMAB A/S

15-Apr-2025

11:10:39 AM

91

1299.50

XCSE

GENMAB A/S

15-Apr-2025

11:10:39 AM

14

1299.50

XCSE

GENMAB A/S

15-Apr-2025

11:13:10 AM

89

1299.50

XCSE

GENMAB A/S

15-Apr-2025

11:13:10 AM

34

1299.50

TQEX

GENMAB A/S

15-Apr-2025

11:13:10 AM

88

1299.50

CEUX

GENMAB A/S

15-Apr-2025

11:13:30 AM

72

1299.50

XCSE

GENMAB A/S

15-Apr-2025

11:13:30 AM

22

1299.00

AQEU

GENMAB A/S

15-Apr-2025

11:14:25 AM

91

1302.00

XCSE

GENMAB A/S

15-Apr-2025

11:14:25 AM

30

1302.00

CEUX

GENMAB A/S

15-Apr-2025

11:14:25 AM

54

1301.50

CEUX

GENMAB A/S

15-Apr-2025

11:14:26 AM

45

1302.00

XCSE

GENMAB A/S

15-Apr-2025

11:15:00 AM

25

1302.50

TQEX

GENMAB A/S

15-Apr-2025

11:15:00 AM

89

1302.50

CEUX

GENMAB A/S

15-Apr-2025

11:15:00 AM

15

1302.50

CEUX

GENMAB A/S

15-Apr-2025

11:15:02 AM

57

1302.50

XCSE

GENMAB A/S

15-Apr-2025

11:15:07 AM

23

1302.50

AQEU

GENMAB A/S

15-Apr-2025

11:15:07 AM

20

1302.50

CEUX

GENMAB A/S

15-Apr-2025

11:15:33 AM

25

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:15:33 AM

77

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:16:06 AM

84

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:16:06 AM

34

1302.50

TQEX

GENMAB A/S

15-Apr-2025

11:16:06 AM

21

1303.00

CEUX

88


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

11:16:06 AM

69

1303.00

CEUX

GENMAB A/S

15-Apr-2025

11:17:04 AM

21

1302.50

AQEU

GENMAB A/S

15-Apr-2025

11:17:28 AM

8

1302.50

AQEU

GENMAB A/S

15-Apr-2025

11:18:52 AM

42

1303.00

CEUX

GENMAB A/S

15-Apr-2025

11:19:00 AM

44

1303.00

CEUX

GENMAB A/S

15-Apr-2025

11:19:03 AM

6

1302.50

AQEU

GENMAB A/S

15-Apr-2025

11:19:40 AM

85

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:19:40 AM

88

1303.00

CEUX

GENMAB A/S

15-Apr-2025

11:20:31 AM

29

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:20:31 AM

31

1303.00

TQEX

GENMAB A/S

15-Apr-2025

11:20:51 AM

60

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:20:51 AM

26

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:21:01 AM

58

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:21:01 AM

15

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:21:01 AM

24

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:21:01 AM

18

1303.00

CEUX

GENMAB A/S

15-Apr-2025

11:21:01 AM

7

1303.00

CEUX

GENMAB A/S

15-Apr-2025

11:21:09 AM

22

1302.50

AQEU

GENMAB A/S

15-Apr-2025

11:21:27 AM

84

1302.00

XCSE

GENMAB A/S

15-Apr-2025

11:21:27 AM

7

1302.50

AQEU

GENMAB A/S

15-Apr-2025

11:21:27 AM

10

1302.00

CEUX

GENMAB A/S

15-Apr-2025

11:21:33 AM

25

1302.00

CEUX

GENMAB A/S

15-Apr-2025

11:21:33 AM

12

1302.00

CEUX

GENMAB A/S

15-Apr-2025

11:21:33 AM

3

1302.00

CEUX

GENMAB A/S

15-Apr-2025

11:21:35 AM

26

1301.50

AQEU

GENMAB A/S

15-Apr-2025

11:21:49 AM

33

1301.00

XCSE

GENMAB A/S

15-Apr-2025

11:21:49 AM

22

1301.50

AQEU

GENMAB A/S

15-Apr-2025

11:21:49 AM

28

1301.50

TQEX

GENMAB A/S

15-Apr-2025

11:21:49 AM

1

1301.50

CEUX

GENMAB A/S

15-Apr-2025

11:21:49 AM

33

1301.50

CEUX

GENMAB A/S

15-Apr-2025

11:22:04 AM

58

1301.00

XCSE

GENMAB A/S

15-Apr-2025

11:24:51 AM

54

1301.50

XCSE

GENMAB A/S

15-Apr-2025

11:24:51 AM

16

1301.50

XCSE

GENMAB A/S

15-Apr-2025

11:24:51 AM

8

1301.00

CEUX

GENMAB A/S

15-Apr-2025

11:24:52 AM

46

1301.50

XCSE

GENMAB A/S

15-Apr-2025

11:26:26 AM

5

1302.50

CEUX

GENMAB A/S

15-Apr-2025

11:26:42 AM

46

1303.00

XCSE

GENMAB A/S

15-Apr-2025

11:30:11 AM

68

1304.00

XCSE

GENMAB A/S

15-Apr-2025

11:30:11 AM

20

1304.00

XCSE

GENMAB A/S

15-Apr-2025

11:30:11 AM

25

1304.00

TQEX

GENMAB A/S

15-Apr-2025

11:31:18 AM

13

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:31:18 AM

52

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:31:18 AM

49

1306.00

XCSE

89


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

11:31:18 AM

8

1305.50

AQEU

GENMAB A/S

15-Apr-2025

11:31:18 AM

87

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:31:18 AM

36

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:31:18 AM

7

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:31:18 AM

8

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:31:18 AM

1

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:31:18 AM

25

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:33:04 AM

25

1306.50

TQEX

GENMAB A/S

15-Apr-2025

11:33:11 AM

84

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:34:01 AM

77

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:34:01 AM

9

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:34:01 AM

48

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:34:01 AM

66

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:34:01 AM

98

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:34:01 AM

15

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:34:13 AM

47

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:34:13 AM

26

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:36:02 AM

91

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:36:04 AM

88

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:36:04 AM

25

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:36:04 AM

36

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:36:04 AM

25

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:36:04 AM

6

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:36:08 AM

13

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:36:15 AM

36

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:36:51 AM

84

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:37:00 AM

1

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:37:04 AM

21

1305.50

AQEU

GENMAB A/S

15-Apr-2025

11:37:05 AM

16

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:37:05 AM

30

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:37:05 AM

14

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:37:05 AM

36

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:37:21 AM

10

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:37:21 AM

25

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:38:06 AM

29

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:38:12 AM

1

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:38:23 AM

14

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:39:00 AM

52

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:40:00 AM

23

1306.50

AQEU

GENMAB A/S

15-Apr-2025

11:40:00 AM

36

1307.00

CEUX

GENMAB A/S

15-Apr-2025

11:40:00 AM

36

1307.00

CEUX

GENMAB A/S

15-Apr-2025

11:40:00 AM

8

1307.00

CEUX

GENMAB A/S

15-Apr-2025

11:40:01 AM

32

1307.00

CEUX

90


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

11:40:37 AM

32

1307.00

CEUX

GENMAB A/S

15-Apr-2025

11:40:41 AM

24

1306.50

AQEU

GENMAB A/S

15-Apr-2025

11:41:04 AM

47

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:41:04 AM

30

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:41:04 AM

25

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:41:04 AM

12

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:41:04 AM

6

1306.50

AQEU

GENMAB A/S

15-Apr-2025

11:41:04 AM

88

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:41:05 AM

47

1306.50

XCSE

GENMAB A/S

15-Apr-2025

11:41:08 AM

89

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:42:06 AM

26

1305.50

TQEX

GENMAB A/S

15-Apr-2025

11:42:06 AM

12

1305.50

AQEU

GENMAB A/S

15-Apr-2025

11:42:06 AM

21

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:42:06 AM

65

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:42:41 AM

75

1305.00

XCSE

GENMAB A/S

15-Apr-2025

11:42:52 AM

10

1305.00

XCSE

GENMAB A/S

15-Apr-2025

11:44:23 AM

31

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:45:35 AM

58

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:45:35 AM

49

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:46:21 AM

86

1305.00

XCSE

GENMAB A/S

15-Apr-2025

11:47:32 AM

31

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:47:32 AM

21

1305.50

AQEU

GENMAB A/S

15-Apr-2025

11:48:34 AM

60

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:48:34 AM

24

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:51:22 AM

89

1305.00

XCSE

GENMAB A/S

15-Apr-2025

11:51:22 AM

72

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:51:22 AM

13

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:51:22 AM

16

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:51:22 AM

13

1305.50

XCSE

GENMAB A/S

15-Apr-2025

11:51:22 AM

33

1305.50

TQEX

GENMAB A/S

15-Apr-2025

11:51:22 AM

18

1305.50

AQEU

GENMAB A/S

15-Apr-2025

11:51:22 AM

36

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:51:22 AM

60

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:51:22 AM

36

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:51:22 AM

10

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:51:22 AM

26

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:51:22 AM

8

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:52:25 AM

88

1306.00

CEUX

GENMAB A/S

15-Apr-2025

11:54:07 AM

35

1306.50

TQEX

GENMAB A/S

15-Apr-2025

11:54:07 AM

22

1306.50

AQEU

GENMAB A/S

15-Apr-2025

11:54:07 AM

36

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:54:07 AM

23

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:54:30 AM

1

1306.50

CEUX

91


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

11:55:38 AM

86

1307.00

XCSE

GENMAB A/S

15-Apr-2025

11:55:38 AM

35

1307.00

XCSE

GENMAB A/S

15-Apr-2025

11:55:38 AM

14

1307.00

XCSE

GENMAB A/S

15-Apr-2025

11:55:38 AM

35

1307.00

XCSE

GENMAB A/S

15-Apr-2025

11:55:38 AM

24

1307.00

XCSE

GENMAB A/S

15-Apr-2025

11:56:11 AM

86

1307.00

XCSE

GENMAB A/S

15-Apr-2025

11:57:10 AM

89

1307.50

XCSE

GENMAB A/S

15-Apr-2025

11:57:10 AM

36

1307.50

CEUX

GENMAB A/S

15-Apr-2025

11:57:33 AM

67

1307.50

XCSE

GENMAB A/S

15-Apr-2025

11:58:29 AM

36

1307.50

CEUX

GENMAB A/S

15-Apr-2025

11:58:30 AM

32

1307.50

CEUX

GENMAB A/S

15-Apr-2025

11:58:33 AM

56

1307.50

XCSE

GENMAB A/S

15-Apr-2025

11:59:00 AM

38

1307.00

TQEX

GENMAB A/S

15-Apr-2025

11:59:03 AM

23

1306.50

AQEU

GENMAB A/S

15-Apr-2025

11:59:03 AM

4

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:59:03 AM

24

1306.50

CEUX

GENMAB A/S

15-Apr-2025

11:59:16 AM

82

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:59:17 AM

4

1306.00

XCSE

GENMAB A/S

15-Apr-2025

11:59:32 AM

90

1305.00

XCSE

GENMAB A/S

15-Apr-2025

11:59:32 AM

32

1305.50

TQEX

GENMAB A/S

15-Apr-2025

11:59:32 AM

44

1305.50

AQEU

GENMAB A/S

15-Apr-2025

11:59:32 AM

87

1305.50

CEUX

GENMAB A/S

15-Apr-2025

11:59:33 AM

5

1304.50

AQEU

GENMAB A/S

15-Apr-2025

11:59:49 AM

37

1304.50

AQEU

GENMAB A/S

15-Apr-2025

11:59:49 AM

84

1304.50

CEUX

GENMAB A/S

15-Apr-2025

11:59:49 AM

2

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:03:19 PM

85

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:03:42 PM

38

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:03:42 PM

15

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:03:42 PM

14

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:03:42 PM

14

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:04:33 PM

15

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:04:33 PM

48

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:05:21 PM

87

1303.50

XCSE

GENMAB A/S

15-Apr-2025

12:05:21 PM

25

1304.00

AQEU

GENMAB A/S

15-Apr-2025

12:06:45 PM

84

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:06:46 PM

25

1304.00

TQEX

GENMAB A/S

15-Apr-2025

12:09:41 PM

87

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:09:41 PM

1

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:09:41 PM

25

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:10:14 PM

85

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:10:16 PM

24

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:10:16 PM

26

1304.50

XCSE

92


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

12:10:16 PM

88

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:10:16 PM

25

1304.00

AQEU

GENMAB A/S

15-Apr-2025

12:10:16 PM

36

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:10:16 PM

3

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:10:17 PM

27

1304.00

TQEX

GENMAB A/S

15-Apr-2025

12:10:17 PM

32

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:12:47 PM

36

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:12:47 PM

11

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:13:22 PM

45

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:13:22 PM

15

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:13:22 PM

34

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:13:23 PM

16

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:13:23 PM

14

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:13:23 PM

39

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:13:23 PM

34

1304.50

XCSE

GENMAB A/S

15-Apr-2025

12:14:00 PM

86

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:14:00 PM

36

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:14:00 PM

3

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:14:00 PM

22

1303.50

CEUX

GENMAB A/S

15-Apr-2025

12:14:01 PM

66

1303.50

CEUX

GENMAB A/S

15-Apr-2025

12:15:21 PM

90

1302.50

XCSE

GENMAB A/S

15-Apr-2025

12:15:21 PM

32

1302.50

TQEX

GENMAB A/S

15-Apr-2025

12:15:21 PM

31

1303.00

AQEU

GENMAB A/S

15-Apr-2025

12:15:33 PM

25

1302.50

CEUX

GENMAB A/S

15-Apr-2025

12:15:33 PM

4

1302.50

CEUX

GENMAB A/S

15-Apr-2025

12:15:59 PM

84

1302.00

CEUX

GENMAB A/S

15-Apr-2025

12:17:42 PM

78

1302.50

CEUX

GENMAB A/S

15-Apr-2025

12:17:42 PM

12

1302.50

CEUX

GENMAB A/S

15-Apr-2025

12:17:51 PM

28

1302.50

XCSE

GENMAB A/S

15-Apr-2025

12:17:51 PM

14

1302.50

XCSE

GENMAB A/S

15-Apr-2025

12:19:53 PM

22

1302.00

AQEU

GENMAB A/S

15-Apr-2025

12:20:01 PM

39

1316.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:01 PM

52

1316.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:02 PM

84

1324.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:02 PM

84

1323.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:02 PM

14

1322.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:02 PM

73

1322.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:02 PM

85

1320.50

XCSE

GENMAB A/S

15-Apr-2025

12:20:02 PM

27

1325.00

TQEX

GENMAB A/S

15-Apr-2025

12:20:02 PM

28

1323.50

TQEX

GENMAB A/S

15-Apr-2025

12:20:02 PM

25

1325.00

AQEU

GENMAB A/S

15-Apr-2025

12:20:02 PM

27

1323.50

AQEU

GENMAB A/S

15-Apr-2025

12:20:02 PM

85

1324.50

CEUX

93


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

12:20:02 PM

4

1323.50

CEUX

GENMAB A/S

15-Apr-2025

12:20:02 PM

83

1323.50

CEUX

GENMAB A/S

15-Apr-2025

12:20:02 PM

69

1322.50

CEUX

GENMAB A/S

15-Apr-2025

12:20:02 PM

20

1322.50

CEUX

GENMAB A/S

15-Apr-2025

12:20:02 PM

89

1321.00

CEUX

GENMAB A/S

15-Apr-2025

12:20:03 PM

85

1319.50

XCSE

GENMAB A/S

15-Apr-2025

12:20:03 PM

30

1321.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:03 PM

20

1321.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:03 PM

50

1320.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:03 PM

27

1319.50

XCSE

GENMAB A/S

15-Apr-2025

12:20:03 PM

38

1321.50

CEUX

GENMAB A/S

15-Apr-2025

12:20:03 PM

35

1320.00

CEUX

GENMAB A/S

15-Apr-2025

12:20:35 PM

26

1311.00

XCSE

GENMAB A/S

15-Apr-2025

12:20:35 PM

33

1311.00

CEUX

GENMAB A/S

15-Apr-2025

12:21:14 PM

31

1310.00

XCSE

GENMAB A/S

15-Apr-2025

12:21:14 PM

26

1309.00

XCSE

GENMAB A/S

15-Apr-2025

12:21:54 PM

29

1309.00

XCSE

GENMAB A/S

15-Apr-2025

12:21:54 PM

22

1309.50

CEUX

GENMAB A/S

15-Apr-2025

12:21:54 PM

8

1309.50

CEUX

GENMAB A/S

15-Apr-2025

12:21:54 PM

2

1309.50

CEUX

GENMAB A/S

15-Apr-2025

12:22:10 PM

28

1311.50

CEUX

GENMAB A/S

15-Apr-2025

12:22:10 PM

2

1311.50

CEUX

GENMAB A/S

15-Apr-2025

12:22:16 PM

25

1314.50

XCSE

GENMAB A/S

15-Apr-2025

12:22:42 PM

25

1316.00

XCSE

GENMAB A/S

15-Apr-2025

12:22:49 PM

25

1314.50

XCSE

GENMAB A/S

15-Apr-2025

12:23:36 PM

25

1313.00

CEUX

GENMAB A/S

15-Apr-2025

12:23:36 PM

1

1313.00

CEUX

GENMAB A/S

15-Apr-2025

12:23:49 PM

6

1313.00

XCSE

GENMAB A/S

15-Apr-2025

12:23:49 PM

1

1313.00

XCSE

GENMAB A/S

15-Apr-2025

12:23:49 PM

1

1313.00

XCSE

GENMAB A/S

15-Apr-2025

12:23:49 PM

18

1313.00

XCSE

GENMAB A/S

15-Apr-2025

12:24:04 PM

25

1316.00

CEUX

GENMAB A/S

15-Apr-2025

12:24:05 PM

32

1316.50

XCSE

GENMAB A/S

15-Apr-2025

12:24:05 PM

27

1315.50

XCSE

GENMAB A/S

15-Apr-2025

12:24:05 PM

26

1316.00

AQEU

GENMAB A/S

15-Apr-2025

12:25:03 PM

29

1314.50

XCSE

GENMAB A/S

15-Apr-2025

12:25:03 PM

32

1313.50

XCSE

GENMAB A/S

15-Apr-2025

12:25:03 PM

25

1315.00

TQEX

GENMAB A/S

15-Apr-2025

12:25:03 PM

26

1315.50

CEUX

GENMAB A/S

15-Apr-2025

12:25:26 PM

19

1312.00

CEUX

GENMAB A/S

15-Apr-2025

12:28:43 PM

50

1311.50

XCSE

GENMAB A/S

15-Apr-2025

12:28:43 PM

17

1311.50

XCSE

GENMAB A/S

15-Apr-2025

12:28:43 PM

26

1311.50

CEUX

94


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

12:29:33 PM

21

1311.50

CEUX

GENMAB A/S

15-Apr-2025

12:29:37 PM

20

1311.50

CEUX

GENMAB A/S

15-Apr-2025

12:29:45 PM

25

1311.50

TQEX

GENMAB A/S

15-Apr-2025

12:30:53 PM

26

1311.50

AQEU

GENMAB A/S

15-Apr-2025

12:30:53 PM

11

1311.50

CEUX

GENMAB A/S

15-Apr-2025

12:30:53 PM

35

1311.50

CEUX

GENMAB A/S

15-Apr-2025

12:31:01 PM

82

1311.00

XCSE

GENMAB A/S

15-Apr-2025

12:31:02 PM

29

1310.00

XCSE

GENMAB A/S

15-Apr-2025

12:31:02 PM

29

1310.00

CEUX

GENMAB A/S

15-Apr-2025

12:31:45 PM

26

1309.00

XCSE

GENMAB A/S

15-Apr-2025

12:31:45 PM

30

1309.00

CEUX

GENMAB A/S

15-Apr-2025

12:31:53 PM

25

1308.00

CEUX

GENMAB A/S

15-Apr-2025

12:32:02 PM

17

1307.50

XCSE

GENMAB A/S

15-Apr-2025

12:32:02 PM

54

1307.50

XCSE

GENMAB A/S

15-Apr-2025

12:32:15 PM

4

1306.00

XCSE

GENMAB A/S

15-Apr-2025

12:32:15 PM

74

1306.00

XCSE

GENMAB A/S

15-Apr-2025

12:32:58 PM

24

1305.00

XCSE

GENMAB A/S

15-Apr-2025

12:32:59 PM

12

1305.00

XCSE

GENMAB A/S

15-Apr-2025

12:32:59 PM

25

1305.00

XCSE

GENMAB A/S

15-Apr-2025

12:33:04 PM

18

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:33:04 PM

8

1304.50

CEUX

GENMAB A/S

15-Apr-2025

12:33:17 PM

30

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:33:17 PM

15

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:35:39 PM

61

1305.00

XCSE

GENMAB A/S

15-Apr-2025

12:35:39 PM

30

1305.00

CEUX

GENMAB A/S

15-Apr-2025

12:35:39 PM

7

1305.00

CEUX

GENMAB A/S

15-Apr-2025

12:36:30 PM

17

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:36:30 PM

1

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:38:51 PM

11

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:40:09 PM

27

1303.00

XCSE

GENMAB A/S

15-Apr-2025

12:40:09 PM

25

1303.50

TQEX

GENMAB A/S

15-Apr-2025

12:40:09 PM

3

1302.50

AQEU

GENMAB A/S

15-Apr-2025

12:40:09 PM

25

1303.50

CEUX

GENMAB A/S

15-Apr-2025

12:40:09 PM

2

1302.50

CEUX

GENMAB A/S

15-Apr-2025

12:40:09 PM

23

1302.50

CEUX

GENMAB A/S

15-Apr-2025

12:40:23 PM

21

1303.50

AQEU

GENMAB A/S

15-Apr-2025

12:41:40 PM

30

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:41:40 PM

30

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:41:40 PM

3

1304.00

CEUX

GENMAB A/S

15-Apr-2025

12:41:54 PM

91

1304.00

XCSE

GENMAB A/S

15-Apr-2025

12:41:54 PM

25

1304.00

TQEX

GENMAB A/S

15-Apr-2025

12:41:54 PM

4

1303.50

AQEU

GENMAB A/S

15-Apr-2025

12:41:55 PM

38

1303.00

CEUX

95


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

12:41:55 PM

24

1303.00

CEUX

GENMAB A/S

15-Apr-2025

12:42:28 PM

21

1302.50

AQEU

GENMAB A/S

15-Apr-2025

12:42:31 PM

87

1302.50

XCSE

GENMAB A/S

15-Apr-2025

12:42:31 PM

1

1302.50

AQEU

GENMAB A/S

15-Apr-2025

12:42:31 PM

58

1302.00

CEUX

GENMAB A/S

15-Apr-2025

12:42:31 PM

8

1302.00

CEUX

GENMAB A/S

15-Apr-2025

12:42:32 PM

31

1301.50

XCSE

GENMAB A/S

15-Apr-2025

12:42:32 PM

12

1301.50

XCSE

GENMAB A/S

15-Apr-2025

12:42:38 PM

25

1301.50

TQEX

GENMAB A/S

15-Apr-2025

12:43:46 PM

10

1300.00

XCSE

GENMAB A/S

15-Apr-2025

12:43:46 PM

21

1300.00

XCSE

GENMAB A/S

15-Apr-2025

12:43:46 PM

58

1300.00

XCSE

GENMAB A/S

15-Apr-2025

12:44:31 PM

17

1299.50

CEUX

GENMAB A/S

15-Apr-2025

12:44:41 PM

85

1299.00

XCSE

GENMAB A/S

15-Apr-2025

12:44:41 PM

8

1299.50

CEUX

GENMAB A/S

15-Apr-2025

12:44:41 PM

4

1298.50

CEUX

GENMAB A/S

15-Apr-2025

12:44:41 PM

4

1298.50

CEUX

GENMAB A/S

15-Apr-2025

12:44:41 PM

18

1298.50

CEUX

GENMAB A/S

15-Apr-2025

12:44:50 PM

15

1299.50

CEUX

GENMAB A/S

15-Apr-2025

12:44:57 PM

11

1299.50

CEUX

GENMAB A/S

15-Apr-2025

12:45:21 PM

65

1299.00

XCSE

GENMAB A/S

15-Apr-2025

12:45:22 PM

13

1298.50

CEUX

GENMAB A/S

15-Apr-2025

12:45:22 PM

13

1298.50

CEUX

GENMAB A/S

15-Apr-2025

12:46:35 PM

25

1300.00

AQEU

GENMAB A/S

15-Apr-2025

12:46:35 PM

25

1300.00

CEUX

GENMAB A/S

15-Apr-2025

12:46:55 PM

25

1300.00

CEUX

GENMAB A/S

15-Apr-2025

12:49:40 PM

16

1300.00

TQEX

GENMAB A/S

15-Apr-2025

12:49:40 PM

9

1300.00

TQEX

GENMAB A/S

15-Apr-2025

12:49:40 PM

14

1300.00

CEUX

GENMAB A/S

15-Apr-2025

12:49:40 PM

21

1300.00

CEUX

GENMAB A/S

15-Apr-2025

12:50:25 PM

81

1299.50

XCSE

GENMAB A/S

15-Apr-2025

12:50:27 PM

1

1299.00

CEUX

GENMAB A/S

15-Apr-2025

12:50:29 PM

18

1299.00

CEUX

GENMAB A/S

15-Apr-2025

12:50:29 PM

6

1299.00

CEUX

GENMAB A/S

15-Apr-2025

12:51:12 PM

40

1300.00

CEUX

GENMAB A/S

15-Apr-2025

12:51:18 PM

10

1300.00

AQEU

GENMAB A/S

15-Apr-2025

12:51:19 PM

15

1300.00

AQEU

GENMAB A/S

15-Apr-2025

12:51:20 PM

87

1300.50

XCSE

GENMAB A/S

15-Apr-2025

12:51:45 PM

35

1300.50

XCSE

GENMAB A/S

15-Apr-2025

12:51:45 PM

50

1300.50

XCSE

GENMAB A/S

15-Apr-2025

12:51:45 PM

27

1301.00

CEUX

GENMAB A/S

15-Apr-2025

12:53:07 PM

85

1300.50

XCSE

GENMAB A/S

15-Apr-2025

12:53:07 PM

25

1300.50

TQEX

96


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

12:53:07 PM

25

1300.50

CEUX

GENMAB A/S

15-Apr-2025

12:55:22 PM

89

1299.50

XCSE

GENMAB A/S

15-Apr-2025

12:55:25 PM

10

1299.00

CEUX

GENMAB A/S

15-Apr-2025

12:55:25 PM

15

1299.00

CEUX

GENMAB A/S

15-Apr-2025

12:57:15 PM

25

1300.00

AQEU

GENMAB A/S

15-Apr-2025

12:58:01 PM

32

1299.50

XCSE

GENMAB A/S

15-Apr-2025

12:58:01 PM

57

1299.50

XCSE

GENMAB A/S

15-Apr-2025

12:58:01 PM

25

1299.50

TQEX

GENMAB A/S

15-Apr-2025

12:58:01 PM

26

1299.50

CEUX

GENMAB A/S

15-Apr-2025

12:58:01 PM

35

1299.50

CEUX

GENMAB A/S

15-Apr-2025

12:58:14 PM

86

1298.50

XCSE

GENMAB A/S

15-Apr-2025

12:58:15 PM

22

1298.00

CEUX

GENMAB A/S

15-Apr-2025

12:58:15 PM

6

1298.00

CEUX

GENMAB A/S

15-Apr-2025

12:58:38 PM

84

1298.00

XCSE

GENMAB A/S

15-Apr-2025

12:58:38 PM

39

1298.00

CEUX

GENMAB A/S

15-Apr-2025

12:58:41 PM

7

1298.00

CEUX

GENMAB A/S

15-Apr-2025

1:00:00 PM

90

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:00:00 PM

5

1298.50

AQEU

GENMAB A/S

15-Apr-2025

1:00:00 PM

18

1298.50

CEUX

GENMAB A/S

15-Apr-2025

1:00:00 PM

17

1298.50

CEUX

GENMAB A/S

15-Apr-2025

1:00:00 PM

8

1298.50

CEUX

GENMAB A/S

15-Apr-2025

1:00:02 PM

12

1298.50

AQEU

GENMAB A/S

15-Apr-2025

1:00:02 PM

8

1298.50

AQEU

GENMAB A/S

15-Apr-2025

1:01:05 PM

77

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:01:05 PM

14

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:01:05 PM

91

1298.00

XCSE

GENMAB A/S

15-Apr-2025

1:01:05 PM

25

1298.00

TQEX

GENMAB A/S

15-Apr-2025

1:01:05 PM

35

1299.50

CEUX

GENMAB A/S

15-Apr-2025

1:01:05 PM

29

1298.50

CEUX

GENMAB A/S

15-Apr-2025

1:01:06 PM

22

1298.00

XCSE

GENMAB A/S

15-Apr-2025

1:01:06 PM

29

1298.00

CEUX

GENMAB A/S

15-Apr-2025

1:01:08 PM

41

1298.00

XCSE

GENMAB A/S

15-Apr-2025

1:01:10 PM

64

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:01:10 PM

3

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:04:08 PM

10

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:04:08 PM

43

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:04:08 PM

32

1299.00

CEUX

GENMAB A/S

15-Apr-2025

1:04:15 PM

3

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:04:15 PM

17

1299.00

AQEU

GENMAB A/S

15-Apr-2025

1:04:15 PM

31

1299.00

CEUX

GENMAB A/S

15-Apr-2025

1:05:24 PM

5

1299.50

CEUX

GENMAB A/S

15-Apr-2025

1:05:27 PM

21

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:05:27 PM

37

1299.50

CEUX

97


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

1:06:00 PM

45

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:06:00 PM

25

1299.50

TQEX

GENMAB A/S

15-Apr-2025

1:06:03 PM

8

1299.00

AQEU

GENMAB A/S

15-Apr-2025

1:08:51 PM

25

1298.50

TQEX

GENMAB A/S

15-Apr-2025

1:10:03 PM

90

1299.00

XCSE

GENMAB A/S

15-Apr-2025

1:10:03 PM

67

1299.00

CEUX

GENMAB A/S

15-Apr-2025

1:10:13 PM

18

1298.50

AQEU

GENMAB A/S

15-Apr-2025

1:10:13 PM

7

1298.50

AQEU

GENMAB A/S

15-Apr-2025

1:10:32 PM

45

1298.00

XCSE

GENMAB A/S

15-Apr-2025

1:10:32 PM

13

1298.00

CEUX

GENMAB A/S

15-Apr-2025

1:10:32 PM

19

1298.00

CEUX

GENMAB A/S

15-Apr-2025

1:11:06 PM

48

1298.50

CEUX

GENMAB A/S

15-Apr-2025

1:11:10 PM

2

1298.50

CEUX

GENMAB A/S

15-Apr-2025

1:11:39 PM

21

1298.00

XCSE

GENMAB A/S

15-Apr-2025

1:12:29 PM

13

1298.00

XCSE

GENMAB A/S

15-Apr-2025

1:12:29 PM

51

1298.00

XCSE

GENMAB A/S

15-Apr-2025

1:12:57 PM

43

1297.50

CEUX

GENMAB A/S

15-Apr-2025

1:13:31 PM

22

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:14:07 PM

16

1297.50

XCSE

GENMAB A/S

15-Apr-2025

1:14:07 PM

29

1297.50

XCSE

GENMAB A/S

15-Apr-2025

1:14:07 PM

16

1297.50

XCSE

GENMAB A/S

15-Apr-2025

1:14:25 PM

16

1296.50

CEUX

GENMAB A/S

15-Apr-2025

1:14:59 PM

14

1296.50

TQEX

GENMAB A/S

15-Apr-2025

1:14:59 PM

3

1296.50

AQEU

GENMAB A/S

15-Apr-2025

1:14:59 PM

9

1296.50

CEUX

GENMAB A/S

15-Apr-2025

1:15:09 PM

16

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:15:09 PM

5

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:15:09 PM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:15:10 PM

18

1296.50

AQEU

GENMAB A/S

15-Apr-2025

1:15:31 PM

11

1296.50

TQEX

GENMAB A/S

15-Apr-2025

1:15:31 PM

4

1296.50

AQEU

GENMAB A/S

15-Apr-2025

1:16:24 PM

41

1296.50

XCSE

GENMAB A/S

15-Apr-2025

1:16:24 PM

45

1296.50

XCSE

GENMAB A/S

15-Apr-2025

1:16:24 PM

62

1296.50

CEUX

GENMAB A/S

15-Apr-2025

1:16:24 PM

2

1296.50

CEUX

GENMAB A/S

15-Apr-2025

1:16:39 PM

88

1295.50

XCSE

GENMAB A/S

15-Apr-2025

1:16:42 PM

37

1295.00

CEUX

GENMAB A/S

15-Apr-2025

1:16:45 PM

25

1294.50

AQEU

GENMAB A/S

15-Apr-2025

1:16:47 PM

14

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:16:47 PM

73

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:16:47 PM

46

1294.00

CEUX

GENMAB A/S

15-Apr-2025

1:17:41 PM

66

1293.00

XCSE

GENMAB A/S

15-Apr-2025

1:18:53 PM

11

1296.50

XCSE

98


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

1:18:53 PM

74

1296.50

XCSE

GENMAB A/S

15-Apr-2025

1:18:53 PM

25

1296.50

TQEX

GENMAB A/S

15-Apr-2025

1:18:53 PM

18

1296.50

CEUX

GENMAB A/S

15-Apr-2025

1:18:53 PM

32

1296.50

CEUX

GENMAB A/S

15-Apr-2025

1:19:07 PM

89

1295.50

XCSE

GENMAB A/S

15-Apr-2025

1:19:07 PM

85

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:19:07 PM

47

1295.50

CEUX

GENMAB A/S

15-Apr-2025

1:19:07 PM

41

1294.00

CEUX

GENMAB A/S

15-Apr-2025

1:19:51 PM

49

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:21:52 PM

39

1295.00

CEUX

GENMAB A/S

15-Apr-2025

1:21:59 PM

19

1295.00

TQEX

GENMAB A/S

15-Apr-2025

1:21:59 PM

6

1295.00

TQEX

GENMAB A/S

15-Apr-2025

1:22:43 PM

21

1295.50

CEUX

GENMAB A/S

15-Apr-2025

1:22:43 PM

13

1295.50

CEUX

GENMAB A/S

15-Apr-2025

1:22:48 PM

14

1295.50

AQEU

GENMAB A/S

15-Apr-2025

1:23:19 PM

87

1296.00

XCSE

GENMAB A/S

15-Apr-2025

1:23:19 PM

33

1296.00

CEUX

GENMAB A/S

15-Apr-2025

1:23:21 PM

11

1295.50

AQEU

GENMAB A/S

15-Apr-2025

1:23:35 PM

68

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:23:36 PM

17

1297.00

XCSE

GENMAB A/S

15-Apr-2025

1:23:36 PM

15

1296.00

XCSE

GENMAB A/S

15-Apr-2025

1:23:36 PM

73

1296.00

XCSE

GENMAB A/S

15-Apr-2025

1:23:36 PM

31

1297.00

CEUX

GENMAB A/S

15-Apr-2025

1:23:52 PM

91

1295.00

XCSE

GENMAB A/S

15-Apr-2025

1:24:35 PM

27

1293.50

XCSE

GENMAB A/S

15-Apr-2025

1:24:35 PM

25

1292.50

XCSE

GENMAB A/S

15-Apr-2025

1:24:35 PM

25

1293.00

CEUX

GENMAB A/S

15-Apr-2025

1:25:43 PM

29

1292.50

CEUX

GENMAB A/S

15-Apr-2025

1:26:53 PM

66

1293.00

XCSE

GENMAB A/S

15-Apr-2025

1:27:45 PM

40

1293.00

XCSE

GENMAB A/S

15-Apr-2025

1:27:45 PM

25

1293.50

TQEX

GENMAB A/S

15-Apr-2025

1:27:45 PM

25

1293.50

AQEU

GENMAB A/S

15-Apr-2025

1:27:45 PM

25

1293.50

CEUX

GENMAB A/S

15-Apr-2025

1:28:07 PM

28

1292.50

CEUX

GENMAB A/S

15-Apr-2025

1:28:08 PM

26

1292.00

XCSE

GENMAB A/S

15-Apr-2025

1:28:13 PM

3

1292.00

XCSE

GENMAB A/S

15-Apr-2025

1:28:13 PM

32

1291.50

CEUX

GENMAB A/S

15-Apr-2025

1:28:37 PM

30

1291.00

XCSE

GENMAB A/S

15-Apr-2025

1:28:37 PM

28

1290.50

CEUX

GENMAB A/S

15-Apr-2025

1:28:39 PM

25

1290.50

XCSE

GENMAB A/S

15-Apr-2025

1:29:03 PM

37

1291.50

XCSE

GENMAB A/S

15-Apr-2025

1:31:02 PM

69

1292.50

XCSE

GENMAB A/S

15-Apr-2025

1:31:02 PM

36

1292.50

CEUX

99


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

1:31:14 PM

12

1292.50

TQEX

GENMAB A/S

15-Apr-2025

1:31:14 PM

5

1292.50

TQEX

GENMAB A/S

15-Apr-2025

1:33:00 PM

84

1293.50

XCSE

GENMAB A/S

15-Apr-2025

1:33:00 PM

25

1293.50

TQEX

GENMAB A/S

15-Apr-2025

1:33:59 PM

2

1295.00

CEUX

GENMAB A/S

15-Apr-2025

1:37:07 PM

77

1295.50

XCSE

GENMAB A/S

15-Apr-2025

1:37:07 PM

9

1295.50

XCSE

GENMAB A/S

15-Apr-2025

1:37:07 PM

27

1295.50

TQEX

GENMAB A/S

15-Apr-2025

1:37:07 PM

34

1295.50

AQEU

GENMAB A/S

15-Apr-2025

1:37:30 PM

90

1295.50

XCSE

GENMAB A/S

15-Apr-2025

1:38:31 PM

45

1295.00

CEUX

GENMAB A/S

15-Apr-2025

1:39:45 PM

90

1295.50

XCSE

GENMAB A/S

15-Apr-2025

1:39:45 PM

53

1295.50

CEUX

GENMAB A/S

15-Apr-2025

1:39:55 PM

28

1296.00

AQEU

GENMAB A/S

15-Apr-2025

1:40:00 PM

17

1295.50

CEUX

GENMAB A/S

15-Apr-2025

1:40:26 PM

12

1295.50

CEUX

GENMAB A/S

15-Apr-2025

1:41:11 PM

4

1295.50

CEUX

GENMAB A/S

15-Apr-2025

1:41:21 PM

28

1295.00

AQEU

GENMAB A/S

15-Apr-2025

1:41:30 PM

51

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:41:30 PM

6

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:41:44 PM

25

1294.50

TQEX

GENMAB A/S

15-Apr-2025

1:43:51 PM

79

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:43:57 PM

9

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:46:07 PM

36

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:46:07 PM

20

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:46:07 PM

34

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:46:52 PM

36

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:46:52 PM

22

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:46:52 PM

42

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:47:33 PM

49

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:47:33 PM

35

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:47:33 PM

50

1294.50

XCSE

GENMAB A/S

15-Apr-2025

1:47:41 PM

27

1293.50

XCSE

GENMAB A/S

15-Apr-2025

1:47:41 PM

25

1294.00

TQEX

GENMAB A/S

15-Apr-2025

1:47:41 PM

26

1294.00

AQEU

GENMAB A/S

15-Apr-2025

1:47:41 PM

23

1293.00

AQEU

GENMAB A/S

15-Apr-2025

1:47:41 PM

42

1294.00

CEUX

GENMAB A/S

15-Apr-2025

1:47:55 PM

5

1293.00

CEUX

GENMAB A/S

15-Apr-2025

1:48:19 PM

30

1293.00

TQEX

GENMAB A/S

15-Apr-2025

1:48:19 PM

26

1293.00

CEUX

GENMAB A/S

15-Apr-2025

1:48:22 PM

84

1292.50

XCSE

GENMAB A/S

15-Apr-2025

1:48:24 PM

28

1292.00

CEUX

GENMAB A/S

15-Apr-2025

1:49:51 PM

89

1293.00

CEUX

100


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

1:50:52 PM

50

1292.50

XCSE

GENMAB A/S

15-Apr-2025

1:50:52 PM

36

1292.50

XCSE

GENMAB A/S

15-Apr-2025

1:51:36 PM

84

1291.00

XCSE

GENMAB A/S

15-Apr-2025

1:51:36 PM

58

1292.00

CEUX

GENMAB A/S

15-Apr-2025

1:52:01 PM

26

1291.00

TQEX

GENMAB A/S

15-Apr-2025

1:52:02 PM

30

1291.00

AQEU

GENMAB A/S

15-Apr-2025

1:54:12 PM

35

1293.00

XCSE

GENMAB A/S

15-Apr-2025

1:54:12 PM

19

1293.00

XCSE

GENMAB A/S

15-Apr-2025

1:54:12 PM

25

1292.50

AQEU

GENMAB A/S

15-Apr-2025

1:54:12 PM

8

1293.00

CEUX

GENMAB A/S

15-Apr-2025

1:54:12 PM

8

1293.00

CEUX

GENMAB A/S

15-Apr-2025

1:55:01 PM

1

1294.00

CEUX

GENMAB A/S

15-Apr-2025

1:56:41 PM

43

1293.00

XCSE

GENMAB A/S

15-Apr-2025

1:56:41 PM

25

1293.50

TQEX

GENMAB A/S

15-Apr-2025

1:56:41 PM

91

1293.50

CEUX

GENMAB A/S

15-Apr-2025

1:57:22 PM

28

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:57:22 PM

28

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:58:08 PM

27

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:58:09 PM

27

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:58:09 PM

27

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:58:09 PM

27

1294.00

XCSE

GENMAB A/S

15-Apr-2025

1:58:51 PM

43

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:00:11 PM

5

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:01:30 PM

35

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:01:30 PM

17

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:01:30 PM

37

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:01:30 PM

25

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:01:30 PM

25

1292.50

TQEX

GENMAB A/S

15-Apr-2025

2:01:30 PM

25

1292.50

AQEU

GENMAB A/S

15-Apr-2025

2:01:30 PM

58

1292.50

CEUX

GENMAB A/S

15-Apr-2025

2:01:30 PM

33

1292.50

CEUX

GENMAB A/S

15-Apr-2025

2:01:30 PM

36

1292.50

CEUX

GENMAB A/S

15-Apr-2025

2:01:44 PM

114

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:01:44 PM

83

1292.00

XCSE

GENMAB A/S

15-Apr-2025

2:02:19 PM

14

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:03:17 PM

4

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:03:17 PM

110

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:03:18 PM

39

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:03:18 PM

36

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:03:18 PM

39

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:03:18 PM

51

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:03:18 PM

22

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:03:33 PM

51

1294.00

XCSE

101


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

2:03:44 PM

7

1294.00

CEUX

GENMAB A/S

15-Apr-2025

2:03:47 PM

14

1294.00

CEUX

GENMAB A/S

15-Apr-2025

2:04:13 PM

39

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:04:33 PM

8

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:04:33 PM

80

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:04:33 PM

15

1294.00

CEUX

GENMAB A/S

15-Apr-2025

2:05:47 PM

28

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:05:47 PM

27

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:05:47 PM

34

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:05:47 PM

18

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:05:47 PM

7

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:06:51 PM

85

1295.00

CEUX

GENMAB A/S

15-Apr-2025

2:07:12 PM

14

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:07:12 PM

12

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:07:41 PM

76

1294.50

XCSE

GENMAB A/S

15-Apr-2025

2:07:41 PM

36

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:07:53 PM

45

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:07:53 PM

29

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:08:22 PM

34

1295.50

TQEX

GENMAB A/S

15-Apr-2025

2:08:22 PM

86

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:08:39 PM

114

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:08:39 PM

31

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:08:39 PM

13

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:08:40 PM

29

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:08:50 PM

91

1297.50

XCSE

GENMAB A/S

15-Apr-2025

2:09:21 PM

40

1297.50

AQEU

GENMAB A/S

15-Apr-2025

2:10:12 PM

33

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:10:12 PM

57

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:10:12 PM

34

1297.00

TQEX

GENMAB A/S

15-Apr-2025

2:10:12 PM

86

1297.00

CEUX

GENMAB A/S

15-Apr-2025

2:10:12 PM

36

1297.00

CEUX

GENMAB A/S

15-Apr-2025

2:10:13 PM

27

1297.00

CEUX

GENMAB A/S

15-Apr-2025

2:10:33 PM

12

1297.00

CEUX

GENMAB A/S

15-Apr-2025

2:11:23 PM

23

1297.00

CEUX

GENMAB A/S

15-Apr-2025

2:12:00 PM

11

1297.00

CEUX

GENMAB A/S

15-Apr-2025

2:12:31 PM

8

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:12:31 PM

42

1296.50

AQEU

GENMAB A/S

15-Apr-2025

2:13:41 PM

36

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:13:41 PM

2

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:13:41 PM

32

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:13:41 PM

12

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:13:50 PM

36

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:13:59 PM

16

1296.00

CEUX

102


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

2:14:29 PM

26

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:14:30 PM

14

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:14:30 PM

26

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:14:30 PM

13

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:14:30 PM

14

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:16:31 PM

26

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:16:31 PM

30

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:16:31 PM

13

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:16:31 PM

32

1296.00

TQEX

GENMAB A/S

15-Apr-2025

2:16:31 PM

72

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:16:31 PM

32

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:17:01 PM

4

1296.50

AQEU

GENMAB A/S

15-Apr-2025

2:17:11 PM

91

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:18:11 PM

22

1296.50

AQEU

GENMAB A/S

15-Apr-2025

2:18:12 PM

4

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:18:22 PM

114

1296.50

XCSE

GENMAB A/S

15-Apr-2025

2:19:40 PM

87

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:19:40 PM

36

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:19:40 PM

25

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:19:46 PM

82

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:20:55 PM

13

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:20:55 PM

15

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:20:56 PM

41

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:21:29 PM

24

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:22:21 PM

38

1295.50

AQEU

GENMAB A/S

15-Apr-2025

2:22:21 PM

25

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:23:52 PM

85

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:23:52 PM

37

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:23:52 PM

15

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:23:52 PM

16

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:23:52 PM

46

1296.00

XCSE

GENMAB A/S

15-Apr-2025

2:23:52 PM

27

1295.00

TQEX

GENMAB A/S

15-Apr-2025

2:23:52 PM

25

1295.50

AQEU

GENMAB A/S

15-Apr-2025

2:23:52 PM

36

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:23:52 PM

7

1296.00

CEUX

GENMAB A/S

15-Apr-2025

2:23:52 PM

85

1295.00

CEUX

GENMAB A/S

15-Apr-2025

2:23:53 PM

48

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:23:54 PM

15

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:23:54 PM

17

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:23:54 PM

32

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:24:05 PM

15

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

15

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

23

1295.50

XCSE

103


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

2:24:06 PM

13

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

14

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

13

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

16

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

34

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

17

1295.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:06 PM

38

1295.50

CEUX

GENMAB A/S

15-Apr-2025

2:24:07 PM

85

1295.00

XCSE

GENMAB A/S

15-Apr-2025

2:24:17 PM

35

1294.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:17 PM

13

1294.50

XCSE

GENMAB A/S

15-Apr-2025

2:24:17 PM

88

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:24:17 PM

25

1294.00

TQEX

GENMAB A/S

15-Apr-2025

2:24:17 PM

36

1294.50

AQEU

GENMAB A/S

15-Apr-2025

2:24:17 PM

89

1294.50

CEUX

GENMAB A/S

15-Apr-2025

2:24:17 PM

43

1293.50

CEUX

GENMAB A/S

15-Apr-2025

2:24:21 PM

47

1293.50

CEUX

GENMAB A/S

15-Apr-2025

2:24:28 PM

89

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:25:51 PM

67

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:25:51 PM

24

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:27:59 PM

26

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:27:59 PM

1

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:27:59 PM

15

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:27:59 PM

75

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:27:59 PM

9

1293.00

XCSE

GENMAB A/S

15-Apr-2025

2:27:59 PM

88

1293.50

CEUX

GENMAB A/S

15-Apr-2025

2:29:11 PM

87

1292.50

XCSE

GENMAB A/S

15-Apr-2025

2:29:11 PM

25

1292.50

TQEX

GENMAB A/S

15-Apr-2025

2:29:11 PM

58

1292.50

CEUX

GENMAB A/S

15-Apr-2025

2:29:11 PM

28

1292.50

CEUX

GENMAB A/S

15-Apr-2025

2:33:11 PM

80

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:33:11 PM

11

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:33:11 PM

43

1293.50

TQEX

GENMAB A/S

15-Apr-2025

2:33:11 PM

90

1293.50

CEUX

GENMAB A/S

15-Apr-2025

2:33:13 PM

88

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:33:13 PM

85

1293.50

CEUX

GENMAB A/S

15-Apr-2025

2:33:21 PM

13

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:33:21 PM

13

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:33:21 PM

14

1294.00

XCSE

GENMAB A/S

15-Apr-2025

2:34:52 PM

56

1293.50

XCSE

GENMAB A/S

15-Apr-2025

2:35:04 PM

41

1295.50

AQEU

GENMAB A/S

15-Apr-2025

2:36:41 PM

87

1294.50

XCSE

GENMAB A/S

15-Apr-2025

2:36:41 PM

7

1295.00

CEUX

GENMAB A/S

15-Apr-2025

2:38:22 PM

39

1297.00

XCSE

104


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

2:38:22 PM

14

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:22 PM

14

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:22 PM

46

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:22 PM

1

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:22 PM

39

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:22 PM

20

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:22 PM

6

1296.50

CEUX

GENMAB A/S

15-Apr-2025

2:38:23 PM

48

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:50 PM

87

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:50 PM

41

1297.00

TQEX

GENMAB A/S

15-Apr-2025

2:38:50 PM

84

1297.00

CEUX

GENMAB A/S

15-Apr-2025

2:38:52 PM

39

1297.00

XCSE

GENMAB A/S

15-Apr-2025

2:38:52 PM

14

1297.00

AQEU

GENMAB A/S

15-Apr-2025

2:39:28 PM

85

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:39:28 PM

35

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:39:28 PM

25

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:39:28 PM

35

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:39:28 PM

15

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:39:28 PM

87

1298.50

CEUX

GENMAB A/S

15-Apr-2025

2:39:46 PM

50

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:39:47 PM

36

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:40:01 PM

25

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:40:35 PM

114

1298.50

XCSE

GENMAB A/S

15-Apr-2025

2:40:35 PM

32

1298.50

CEUX

GENMAB A/S

15-Apr-2025

2:40:37 PM

89

1297.50

XCSE

GENMAB A/S

15-Apr-2025

2:40:37 PM

30

1298.00

TQEX

GENMAB A/S

15-Apr-2025

2:40:37 PM

40

1298.00

AQEU

GENMAB A/S

15-Apr-2025

2:40:37 PM

30

1297.50

CEUX

GENMAB A/S

15-Apr-2025

2:40:37 PM

54

1297.50

CEUX

GENMAB A/S

15-Apr-2025

2:40:39 PM

13

1297.00

TQEX

GENMAB A/S

15-Apr-2025

2:43:02 PM

34

1299.50

XCSE

GENMAB A/S

15-Apr-2025

2:43:02 PM

30

1299.50

XCSE

GENMAB A/S

15-Apr-2025

2:43:05 PM

149

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:43:05 PM

25

1300.00

TQEX

GENMAB A/S

15-Apr-2025

2:43:05 PM

52

1300.00

CEUX

GENMAB A/S

15-Apr-2025

2:43:46 PM

37

1300.50

TQEX

GENMAB A/S

15-Apr-2025

2:43:46 PM

64

1300.50

CEUX

GENMAB A/S

15-Apr-2025

2:43:46 PM

27

1300.50

CEUX

GENMAB A/S

15-Apr-2025

2:43:57 PM

85

1301.00

XCSE

GENMAB A/S

15-Apr-2025

2:43:57 PM

5

1301.00

AQEU

GENMAB A/S

15-Apr-2025

2:43:57 PM

29

1301.00

AQEU

GENMAB A/S

15-Apr-2025

2:43:59 PM

84

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:43:59 PM

1

1300.00

XCSE

105


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

2:43:59 PM

90

1300.50

CEUX

GENMAB A/S

15-Apr-2025

2:44:00 PM

36

1300.00

AQEU

GENMAB A/S

15-Apr-2025

2:44:04 PM

60

1299.50

CEUX

GENMAB A/S

15-Apr-2025

2:44:04 PM

27

1299.50

CEUX

GENMAB A/S

15-Apr-2025

2:44:25 PM

14

1299.50

CEUX

GENMAB A/S

15-Apr-2025

2:44:32 PM

72

1299.50

CEUX

GENMAB A/S

15-Apr-2025

2:44:40 PM

89

1299.00

XCSE

GENMAB A/S

15-Apr-2025

2:45:45 PM

90

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:46:27 PM

85

1300.50

XCSE

GENMAB A/S

15-Apr-2025

2:46:27 PM

25

1300.50

TQEX

GENMAB A/S

15-Apr-2025

2:47:38 PM

34

1300.50

XCSE

GENMAB A/S

15-Apr-2025

2:48:14 PM

34

1301.00

TQEX

GENMAB A/S

15-Apr-2025

2:48:14 PM

28

1301.00

AQEU

GENMAB A/S

15-Apr-2025

2:48:18 PM

52

1300.50

XCSE

GENMAB A/S

15-Apr-2025

2:49:03 PM

85

1300.50

CEUX

GENMAB A/S

15-Apr-2025

2:50:51 PM

91

1300.50

XCSE

GENMAB A/S

15-Apr-2025

2:50:51 PM

91

1300.50

CEUX

GENMAB A/S

15-Apr-2025

2:50:52 PM

15

1300.00

AQEU

GENMAB A/S

15-Apr-2025

2:50:55 PM

2

1300.00

AQEU

GENMAB A/S

15-Apr-2025

2:51:02 PM

10

1300.00

AQEU

GENMAB A/S

15-Apr-2025

2:51:03 PM

18

1299.00

AQEU

GENMAB A/S

15-Apr-2025

2:51:03 PM

38

1299.50

CEUX

GENMAB A/S

15-Apr-2025

2:51:13 PM

47

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:51:13 PM

35

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:51:13 PM

13

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:51:13 PM

15

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:51:13 PM

4

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:52:23 PM

42

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:52:23 PM

13

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:52:23 PM

2

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:52:23 PM

34

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:52:23 PM

14

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:52:23 PM

9

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:53:01 PM

90

1299.00

XCSE

GENMAB A/S

15-Apr-2025

2:53:45 PM

15

1299.50

TQEX

GENMAB A/S

15-Apr-2025

2:53:45 PM

87

1300.00

CEUX

GENMAB A/S

15-Apr-2025

2:53:45 PM

4

1300.00

CEUX

GENMAB A/S

15-Apr-2025

2:54:13 PM

6

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:54:13 PM

13

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:54:13 PM

88

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:54:34 PM

88

1300.00

CEUX

GENMAB A/S

15-Apr-2025

2:55:23 PM

21

1300.50

XCSE

GENMAB A/S

15-Apr-2025

2:55:23 PM

1

1300.50

XCSE

106


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

2:55:23 PM

2

1300.50

XCSE

GENMAB A/S

15-Apr-2025

2:57:11 PM

85

1300.00

XCSE

GENMAB A/S

15-Apr-2025

2:57:11 PM

21

1300.50

TQEX

GENMAB A/S

15-Apr-2025

2:57:11 PM

5

1300.50

TQEX

GENMAB A/S

15-Apr-2025

2:57:24 PM

88

1300.50

XCSE

GENMAB A/S

15-Apr-2025

2:58:51 PM

35

1301.00

XCSE

GENMAB A/S

15-Apr-2025

2:58:51 PM

26

1301.00

XCSE

GENMAB A/S

15-Apr-2025

2:58:51 PM

31

1301.00

AQEU

GENMAB A/S

15-Apr-2025

2:58:51 PM

84

1301.00

CEUX

GENMAB A/S

15-Apr-2025

2:59:25 PM

58

1301.50

XCSE

GENMAB A/S

15-Apr-2025

2:59:25 PM

17

1301.50

XCSE

GENMAB A/S

15-Apr-2025

2:59:25 PM

14

1301.50

XCSE

GENMAB A/S

15-Apr-2025

2:59:25 PM

43

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:00:49 PM

2

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:00:49 PM

1

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:00:49 PM

32

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:01:51 PM

84

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:51 PM

35

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:51 PM

20

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:51 PM

17

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:51 PM

42

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:51 PM

2

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:01:51 PM

89

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:01:52 PM

4

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:52 PM

35

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:52 PM

27

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:52 PM

16

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:01:52 PM

32

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:02:49 PM

47

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:02:49 PM

20

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:02:49 PM

24

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:02:49 PM

17

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:02:49 PM

2

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:02:53 PM

91

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:02:53 PM

28

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:02:53 PM

10

1299.50

TQEX

GENMAB A/S

15-Apr-2025

3:02:53 PM

25

1301.00

AQEU

GENMAB A/S

15-Apr-2025

3:02:53 PM

27

1300.00

AQEU

GENMAB A/S

15-Apr-2025

3:02:53 PM

15

1299.00

AQEU

GENMAB A/S

15-Apr-2025

3:02:53 PM

88

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:02:53 PM

84

1300.00

CEUX

GENMAB A/S

15-Apr-2025

3:02:54 PM

84

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:04:43 PM

81

1300.50

XCSE

107


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:05:19 PM

87

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:08:08 PM

12

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:08:30 PM

89

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:09:25 PM

71

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:10:19 PM

35

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:10:19 PM

7

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:10:26 PM

43

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:10:26 PM

25

1300.50

AQEU

GENMAB A/S

15-Apr-2025

3:10:26 PM

32

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:10:26 PM

90

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:11:01 PM

88

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:11:31 PM

22

1300.50

AQEU

GENMAB A/S

15-Apr-2025

3:11:31 PM

72

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:11:36 PM

19

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:11:43 PM

3

1300.50

AQEU

GENMAB A/S

15-Apr-2025

3:12:41 PM

84

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:13:14 PM

15

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:13:14 PM

16

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:13:51 PM

53

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:13:51 PM

37

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:13:51 PM

42

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:13:51 PM

90

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:15:22 PM

85

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:15:22 PM

90

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:16:12 PM

25

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:16:21 PM

64

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:16:45 PM

85

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:16:45 PM

56

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:18:02 PM

35

1302.50

AQEU

GENMAB A/S

15-Apr-2025

3:18:02 PM

30

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:18:23 PM

32

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:18:51 PM

38

1302.00

TQEX

GENMAB A/S

15-Apr-2025

3:19:37 PM

7

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:19:37 PM

13

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:19:37 PM

8

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:19:37 PM

1

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:19:37 PM

8

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:19:37 PM

7

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:19:43 PM

34

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:19:43 PM

16

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:19:43 PM

17

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:19:43 PM

16

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:19:43 PM

7

1302.50

CEUX

108


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:19:43 PM

18

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:20:11 PM

3

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:20:11 PM

3

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:20:11 PM

19

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:21:01 PM

40

1302.50

TQEX

GENMAB A/S

15-Apr-2025

3:21:01 PM

16

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:21:01 PM

8

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:21:01 PM

31

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:21:04 PM

46

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

24

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

15

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

15

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

48

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

17

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

15

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

24

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:04 PM

32

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:21:05 PM

17

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:05 PM

16

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:05 PM

14

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:05 PM

67

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:05 PM

9

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:05 PM

14

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:06 PM

42

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:06 PM

49

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:06 PM

45

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:06 PM

12

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:21:15 PM

35

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:21:15 PM

14

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:21:15 PM

16

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:21:15 PM

24

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:21:15 PM

24

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:15 PM

1

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:21:15 PM

36

1301.50

AQEU

GENMAB A/S

15-Apr-2025

3:21:15 PM

75

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:22:20 PM

81

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:22:20 PM

9

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:22:20 PM

13

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:22:20 PM

7

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:22:20 PM

4

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:22:23 PM

36

1302.00

TQEX

GENMAB A/S

15-Apr-2025

3:22:37 PM

50

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:23:01 PM

37

1302.50

CEUX

109


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:23:14 PM

37

1302.50

AQEU

GENMAB A/S

15-Apr-2025

3:23:53 PM

49

1303.00

CEUX

GENMAB A/S

15-Apr-2025

3:23:53 PM

4

1303.00

CEUX

GENMAB A/S

15-Apr-2025

3:24:05 PM

114

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:24:05 PM

9

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:24:05 PM

36

1302.50

AQEU

GENMAB A/S

15-Apr-2025

3:24:05 PM

91

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:24:16 PM

89

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:24:17 PM

26

1302.50

AQEU

GENMAB A/S

15-Apr-2025

3:24:17 PM

84

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:25:11 PM

91

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:25:11 PM

87

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:25:11 PM

3

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:25:11 PM

1

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:25:11 PM

25

1303.00

AQEU

GENMAB A/S

15-Apr-2025

3:26:34 PM

47

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

35

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

26

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

6

1303.00

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

82

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

2

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

17

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

17

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

35

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

16

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

29

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:34 PM

4

1302.00

TQEX

GENMAB A/S

15-Apr-2025

3:26:34 PM

84

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:26:34 PM

25

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:26:34 PM

31

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:26:34 PM

8

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:26:34 PM

36

1303.00

CEUX

GENMAB A/S

15-Apr-2025

3:26:34 PM

8

1303.00

CEUX

GENMAB A/S

15-Apr-2025

3:26:34 PM

6

1303.00

CEUX

GENMAB A/S

15-Apr-2025

3:26:35 PM

16

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

26

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

16

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

17

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

14

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

26

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

57

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

17

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

14

1302.50

XCSE

110


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:26:35 PM

26

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

15

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:35 PM

41

1302.00

TQEX

GENMAB A/S

15-Apr-2025

3:26:36 PM

48

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:36 PM

16

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:36 PM

15

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:36 PM

26

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:36 PM

9

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:36 PM

30

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:36 PM

17

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:36 PM

14

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:37 PM

17

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:37 PM

26

1302.50

XCSE

GENMAB A/S

15-Apr-2025

3:26:57 PM

26

1302.50

AQEU

GENMAB A/S

15-Apr-2025

3:26:57 PM

84

1302.50

CEUX

GENMAB A/S

15-Apr-2025

3:27:21 PM

77

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:21 PM

9

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:26 PM

11

1302.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:50 PM

13

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:50 PM

35

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:50 PM

14

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:50 PM

17

1302.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:50 PM

85

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:50 PM

3

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.50

AQEU

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.50

AQEU

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.50

AQEU

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.50

AQEU

GENMAB A/S

15-Apr-2025

3:27:50 PM

2

1301.50

AQEU

GENMAB A/S

15-Apr-2025

3:27:50 PM

31

1301.50

AQEU

GENMAB A/S

15-Apr-2025

3:27:50 PM

89

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:27:51 PM

16

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:27:51 PM

9

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:27:52 PM

35

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:52 PM

23

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:52 PM

13

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:27:52 PM

77

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:28:00 PM

89

1300.50

XCSE

111


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:28:00 PM

5

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:28:00 PM

7

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:28:00 PM

5

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:28:00 PM

6

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:28:00 PM

11

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:28:00 PM

1

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:28:00 PM

4

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:28:00 PM

5

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:28:00 PM

6

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:28:00 PM

38

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:28:10 PM

35

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:28:13 PM

59

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:28:41 PM

62

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:29:11 PM

28

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:29:11 PM

31

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:30:00 PM

7

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:00 PM

14

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:00 PM

15

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:00 PM

15

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:00 PM

35

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:00 PM

31

1300.50

AQEU

GENMAB A/S

15-Apr-2025

3:30:00 PM

65

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:30:04 PM

91

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:04 PM

12

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:04 PM

13

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:04 PM

35

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:04 PM

46

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:04 PM

8

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:04 PM

6

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:04 PM

35

1301.00

TQEX

GENMAB A/S

15-Apr-2025

3:30:04 PM

76

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:30:11 PM

85

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:41 PM

25

1300.50

AQEU

GENMAB A/S

15-Apr-2025

3:30:52 PM

6

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

2

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

2

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

2

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

15

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

5

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

3

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

2

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

6

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:52 PM

63

1300.00

CEUX

112


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:30:53 PM

19

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:53 PM

27

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:30:53 PM

14

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:30:53 PM

14

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:31:01 PM

90

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:31:21 PM

28

1299.50

AQEU

GENMAB A/S

15-Apr-2025

3:31:22 PM

18

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:31:29 PM

86

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:31:29 PM

29

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:31:51 PM

88

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:31:51 PM

33

1299.50

TQEX

GENMAB A/S

15-Apr-2025

3:31:53 PM

27

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:31:53 PM

16

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:32:03 PM

17

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:32:03 PM

13

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:32:03 PM

12

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:32:03 PM

46

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:32:05 PM

3

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:32:05 PM

79

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:32:07 PM

45

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:07 PM

39

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:07 PM

32

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:32:22 PM

31

1301.50

TQEX

GENMAB A/S

15-Apr-2025

3:32:27 PM

88

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:32:27 PM

48

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:27 PM

20

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:27 PM

35

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:27 PM

11

1300.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:27 PM

86

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:32:27 PM

29

1301.00

AQEU

GENMAB A/S

15-Apr-2025

3:32:27 PM

26

1300.00

AQEU

GENMAB A/S

15-Apr-2025

3:32:27 PM

84

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:27 PM

86

1300.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:30 PM

3

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

14

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

46

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

2

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

3

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

5

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

4

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

3

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

3

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

5

1299.50

XCSE

113


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:32:30 PM

3

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

7

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

16

1299.50

XCSE

GENMAB A/S

15-Apr-2025

3:32:30 PM

84

1300.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:30 PM

12

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:30 PM

5

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:30 PM

8

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:30 PM

7

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:30 PM

6

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:30 PM

2

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:31 PM

17

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:32:31 PM

68

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:32:31 PM

47

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:32:32 PM

4

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:32:51 PM

89

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:02 PM

6

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:11 PM

35

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:11 PM

19

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:11 PM

17

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:11 PM

16

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:14 PM

88

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:14 PM

16

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:14 PM

14

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:14 PM

16

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:33:14 PM

49

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:14 PM

19

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:14 PM

28

1297.50

TQEX

GENMAB A/S

15-Apr-2025

3:33:14 PM

33

1298.00

AQEU

GENMAB A/S

15-Apr-2025

3:33:14 PM

89

1297.50

CEUX

GENMAB A/S

15-Apr-2025

3:33:31 PM

35

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:31 PM

13

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:31 PM

46

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:31 PM

17

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:31 PM

28

1298.00

AQEU

GENMAB A/S

15-Apr-2025

3:33:32 PM

48

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:32 PM

11

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:33:51 PM

87

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:34:01 PM

80

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:34:01 PM

9

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:34:01 PM

50

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:34:01 PM

12

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:34:19 PM

21

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:34:20 PM

54

1299.50

CEUX

114


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:34:39 PM

27

1301.50

TQEX

GENMAB A/S

15-Apr-2025

3:34:39 PM

11

1301.50

TQEX

GENMAB A/S

15-Apr-2025

3:34:39 PM

34

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:34:39 PM

54

1301.50

CEUX

GENMAB A/S

15-Apr-2025

3:34:51 PM

2

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:34:59 PM

36

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:35:00 PM

12

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:35:00 PM

31

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:35:00 PM

13

1302.00

CEUX

GENMAB A/S

15-Apr-2025

3:35:04 PM

83

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:04 PM

35

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:04 PM

48

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:04 PM

31

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:04 PM

30

1301.00

AQEU

GENMAB A/S

15-Apr-2025

3:35:05 PM

15

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

23

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

16

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

17

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

35

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

22

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

46

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

15

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

17

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

14

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

14

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

13

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

46

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:05 PM

16

1301.50

XCSE

GENMAB A/S

15-Apr-2025

3:35:13 PM

85

1301.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:13 PM

26

1301.00

AQEU

GENMAB A/S

15-Apr-2025

3:35:13 PM

32

1301.00

CEUX

GENMAB A/S

15-Apr-2025

3:35:33 PM

5

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:33 PM

15

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:33 PM

10

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:33 PM

5

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:33 PM

10

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:33 PM

5

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:33 PM

40

1300.00

XCSE

GENMAB A/S

15-Apr-2025

3:35:33 PM

38

1300.50

TQEX

GENMAB A/S

15-Apr-2025

3:35:33 PM

4

1299.50

TQEX

GENMAB A/S

15-Apr-2025

3:35:33 PM

2

1299.50

TQEX

GENMAB A/S

15-Apr-2025

3:35:33 PM

5

1299.50

TQEX

GENMAB A/S

15-Apr-2025

3:35:33 PM

26

1300.00

AQEU

115


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:35:33 PM

90

1300.50

CEUX

GENMAB A/S

15-Apr-2025

3:35:50 PM

23

1299.50

TQEX

GENMAB A/S

15-Apr-2025

3:35:50 PM

20

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:35:50 PM

64

1299.50

CEUX

GENMAB A/S

15-Apr-2025

3:35:51 PM

90

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:36:02 PM

91

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:36:02 PM

87

1298.00

CEUX

GENMAB A/S

15-Apr-2025

3:36:03 PM

41

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:36:03 PM

50

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:36:03 PM

88

1297.00

CEUX

GENMAB A/S

15-Apr-2025

3:36:03 PM

23

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:36:40 PM

89

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:37:01 PM

90

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:37:01 PM

25

1298.00

TQEX

GENMAB A/S

15-Apr-2025

3:37:01 PM

11

1298.00

CEUX

GENMAB A/S

15-Apr-2025

3:37:01 PM

77

1298.00

CEUX

GENMAB A/S

15-Apr-2025

3:37:21 PM

86

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:38:28 PM

86

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:38:29 PM

86

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:38:29 PM

35

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:38:29 PM

24

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:38:29 PM

46

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:38:29 PM

9

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:38:29 PM

25

1298.50

AQEU

GENMAB A/S

15-Apr-2025

3:38:29 PM

90

1298.00

CEUX

GENMAB A/S

15-Apr-2025

3:38:30 PM

31

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:38:31 PM

54

1298.50

XCSE

GENMAB A/S

15-Apr-2025

3:39:01 PM

2

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:06 PM

85

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:06 PM

26

1299.50

AQEU

GENMAB A/S

15-Apr-2025

3:39:10 PM

2

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:33 PM

56

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:43 PM

15

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:43 PM

25

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:53 PM

15

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:53 PM

25

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:53 PM

2

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:39:53 PM

46

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:40:13 PM

32

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:40:31 PM

25

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:40:32 PM

26

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:40:43 PM

3

1299.00

CEUX

GENMAB A/S

15-Apr-2025

3:40:51 PM

80

1299.00

XCSE

116


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:40:51 PM

7

1299.00

XCSE

GENMAB A/S

15-Apr-2025

3:40:52 PM

5

1299.00

AQEU

GENMAB A/S

15-Apr-2025

3:40:53 PM

30

1299.00

AQEU

GENMAB A/S

15-Apr-2025

3:40:56 PM

91

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:40:56 PM

84

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:40:56 PM

91

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:40:56 PM

91

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:40:56 PM

90

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:40:56 PM

91

1292.50

XCSE

GENMAB A/S

15-Apr-2025

3:40:56 PM

86

1291.00

XCSE

GENMAB A/S

15-Apr-2025

3:40:56 PM

27

1298.00

TQEX

GENMAB A/S

15-Apr-2025

3:40:56 PM

26

1296.50

TQEX

GENMAB A/S

15-Apr-2025

3:40:56 PM

33

1295.50

TQEX

GENMAB A/S

15-Apr-2025

3:40:56 PM

35

1298.00

AQEU

GENMAB A/S

15-Apr-2025

3:40:56 PM

25

1297.00

AQEU

GENMAB A/S

15-Apr-2025

3:40:56 PM

85

1298.50

CEUX

GENMAB A/S

15-Apr-2025

3:40:56 PM

85

1297.00

CEUX

GENMAB A/S

15-Apr-2025

3:40:56 PM

84

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:40:56 PM

66

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:40:56 PM

23

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:40:56 PM

86

1294.00

CEUX

GENMAB A/S

15-Apr-2025

3:40:56 PM

87

1292.50

CEUX

GENMAB A/S

15-Apr-2025

3:40:56 PM

28

1291.50

CEUX

GENMAB A/S

15-Apr-2025

3:40:57 PM

29

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:41:28 PM

49

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:41:28 PM

14

1294.50

CEUX

GENMAB A/S

15-Apr-2025

3:41:28 PM

20

1294.50

CEUX

GENMAB A/S

15-Apr-2025

3:41:30 PM

29

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:42:38 PM

91

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:42:38 PM

34

1294.00

TQEX

GENMAB A/S

15-Apr-2025

3:42:54 PM

68

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:42:54 PM

17

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:43:30 PM

87

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:43:51 PM

25

1295.00

TQEX

GENMAB A/S

15-Apr-2025

3:43:51 PM

27

1295.00

AQEU

GENMAB A/S

15-Apr-2025

3:43:51 PM

84

1295.00

CEUX

GENMAB A/S

15-Apr-2025

3:44:11 PM

1

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:44:11 PM

89

1294.50

CEUX

GENMAB A/S

15-Apr-2025

3:44:22 PM

91

1294.50

CEUX

GENMAB A/S

15-Apr-2025

3:44:31 PM

74

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:44:31 PM

12

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:44:31 PM

21

1294.00

TQEX

GENMAB A/S

15-Apr-2025

3:44:31 PM

12

1294.00

TQEX

117


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:44:51 PM

27

1294.00

AQEU

GENMAB A/S

15-Apr-2025

3:44:51 PM

25

1293.50

CEUX

GENMAB A/S

15-Apr-2025

3:45:04 PM

30

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:45:36 PM

84

1293.50

CEUX

GENMAB A/S

15-Apr-2025

3:45:36 PM

3

1293.50

CEUX

GENMAB A/S

15-Apr-2025

3:45:45 PM

47

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:45 PM

46

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:45 PM

13

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:45 PM

86

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

17

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

26

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

46

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

17

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

14

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

26

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

17

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:45:46 PM

46

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:46:07 PM

6

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:07 PM

2

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:07 PM

3

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:07 PM

77

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:07 PM

30

1293.50

AQEU

GENMAB A/S

15-Apr-2025

3:46:07 PM

88

1293.00

CEUX

GENMAB A/S

15-Apr-2025

3:46:19 PM

88

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:19 PM

3

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:19 PM

89

1293.00

CEUX

GENMAB A/S

15-Apr-2025

3:46:47 PM

16

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:47 PM

14

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:47 PM

14

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:46:47 PM

46

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:47:31 PM

28

1295.50

TQEX

GENMAB A/S

15-Apr-2025

3:47:31 PM

91

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:47:32 PM

21

1296.00

TQEX

GENMAB A/S

15-Apr-2025

3:47:32 PM

81

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:47:32 PM

7

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:48:16 PM

28

1297.00

TQEX

GENMAB A/S

15-Apr-2025

3:48:41 PM

86

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:48:41 PM

91

1296.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:02 PM

14

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:49:02 PM

46

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:49:02 PM

21

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:49:02 PM

4

1296.00

TQEX

GENMAB A/S

15-Apr-2025

3:49:02 PM

34

1296.50

AQEU

118


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:49:21 PM

2

1296.00

TQEX

GENMAB A/S

15-Apr-2025

3:49:21 PM

35

1296.50

AQEU

GENMAB A/S

15-Apr-2025

3:49:21 PM

86

1296.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:38 PM

1

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:43 PM

2

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:44 PM

1

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:48 PM

1

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:48 PM

2

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:48 PM

81

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:51 PM

90

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:49:51 PM

42

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:49:51 PM

12

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:49:51 PM

25

1295.50

AQEU

GENMAB A/S

15-Apr-2025

3:49:52 PM

1

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:49:55 PM

46

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:49:58 PM

114

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:50:01 PM

86

1296.50

CEUX

GENMAB A/S

15-Apr-2025

3:50:02 PM

15

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:50:02 PM

25

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:50:35 PM

25

1297.00

TQEX

GENMAB A/S

15-Apr-2025

3:51:22 PM

41

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:51:22 PM

48

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:51:22 PM

3

1297.50

TQEX

GENMAB A/S

15-Apr-2025

3:51:22 PM

22

1297.50

TQEX

GENMAB A/S

15-Apr-2025

3:51:22 PM

88

1297.50

CEUX

GENMAB A/S

15-Apr-2025

3:51:37 PM

12

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:51:37 PM

18

1297.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:21 PM

76

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:21 PM

9

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:21 PM

46

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:21 PM

38

1298.00

TQEX

GENMAB A/S

15-Apr-2025

3:52:21 PM

7

1298.00

AQEU

GENMAB A/S

15-Apr-2025

3:52:27 PM

50

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:27 PM

35

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:27 PM

22

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:27 PM

7

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:27 PM

39

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:27 PM

17

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:27 PM

14

1298.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:27 PM

36

1298.00

AQEU

GENMAB A/S

15-Apr-2025

3:52:27 PM

89

1297.50

CEUX

GENMAB A/S

15-Apr-2025

3:52:28 PM

24

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:28 PM

24

1297.00

XCSE

119


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:52:28 PM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:28 PM

25

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:28 PM

16

1297.00

TQEX

GENMAB A/S

15-Apr-2025

3:52:28 PM

10

1297.00

TQEX

GENMAB A/S

15-Apr-2025

3:52:28 PM

5

1297.00

TQEX

GENMAB A/S

15-Apr-2025

3:52:28 PM

25

1297.00

AQEU

GENMAB A/S

15-Apr-2025

3:52:28 PM

1

1297.50

CEUX

GENMAB A/S

15-Apr-2025

3:52:28 PM

90

1297.50

CEUX

GENMAB A/S

15-Apr-2025

3:52:30 PM

46

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

17

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

35

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

16

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

16

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

59

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

16

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:30 PM

1

1297.00

AQEU

GENMAB A/S

15-Apr-2025

3:52:30 PM

12

1296.50

CEUX

GENMAB A/S

15-Apr-2025

3:52:30 PM

31

1296.50

CEUX

GENMAB A/S

15-Apr-2025

3:52:31 PM

14

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:31 PM

23

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:32 PM

87

1297.00

CEUX

GENMAB A/S

15-Apr-2025

3:52:35 PM

35

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

28

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

35

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

1

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

50

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

17

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

28

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:35 PM

4

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:52:36 PM

17

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:36 PM

28

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:36 PM

14

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:36 PM

55

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:36 PM

37

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:52:52 PM

14

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:53:05 PM

90

1296.00

XCSE

GENMAB A/S

15-Apr-2025

3:53:05 PM

35

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:53:05 PM

46

1296.00

XCSE

GENMAB A/S

15-Apr-2025

3:53:05 PM

33

1296.00

XCSE

GENMAB A/S

15-Apr-2025

3:53:05 PM

38

1296.00

TQEX

120


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:53:05 PM

30

1296.00

AQEU

GENMAB A/S

15-Apr-2025

3:53:05 PM

11

1296.50

CEUX

GENMAB A/S

15-Apr-2025

3:53:05 PM

74

1296.50

CEUX

GENMAB A/S

15-Apr-2025

3:53:05 PM

88

1295.50

CEUX

GENMAB A/S

15-Apr-2025

3:53:06 PM

29

1295.00

CEUX

GENMAB A/S

15-Apr-2025

3:53:40 PM

18

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:53:51 PM

91

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:53:52 PM

49

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:53:52 PM

46

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:53:52 PM

10

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:53:52 PM

34

1296.50

AQEU

GENMAB A/S

15-Apr-2025

3:53:54 PM

41

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:53:54 PM

5

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:54:01 PM

10

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:54:18 PM

22

1296.50

TQEX

GENMAB A/S

15-Apr-2025

3:54:18 PM

7

1296.50

TQEX

GENMAB A/S

15-Apr-2025

3:54:21 PM

1

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:54:47 PM

87

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:55:24 PM

26

1296.50

TQEX

GENMAB A/S

15-Apr-2025

3:55:27 PM

25

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:55:30 PM

35

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:55:30 PM

22

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:55:30 PM

15

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:55:30 PM

42

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:55:30 PM

89

1297.00

CEUX

GENMAB A/S

15-Apr-2025

3:55:31 PM

17

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:55:31 PM

46

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:55:31 PM

22

1297.00

XCSE

GENMAB A/S

15-Apr-2025

3:55:31 PM

60

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:01 PM

87

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:04 PM

49

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:04 PM

35

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:04 PM

16

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:04 PM

85

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:25 PM

49

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:33 PM

67

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:33 PM

21

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:53 PM

48

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:53 PM

29

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:56:53 PM

27

1296.00

TQEX

GENMAB A/S

15-Apr-2025

3:56:53 PM

14

1296.00

AQEU

GENMAB A/S

15-Apr-2025

3:56:53 PM

18

1296.00

AQEU

GENMAB A/S

15-Apr-2025

3:56:53 PM

5

1296.00

CEUX

121


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:56:53 PM

79

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:57:03 PM

13

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:57:03 PM

7

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:57:03 PM

59

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:57:03 PM

11

1296.50

XCSE

GENMAB A/S

15-Apr-2025

3:57:17 PM

27

1296.00

TQEX

GENMAB A/S

15-Apr-2025

3:57:17 PM

3

1296.00

TQEX

GENMAB A/S

15-Apr-2025

3:57:17 PM

88

1296.00

CEUX

GENMAB A/S

15-Apr-2025

3:57:21 PM

60

1295.50

XCSE

GENMAB A/S

15-Apr-2025

3:57:51 PM

5

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:57:51 PM

31

1295.00

AQEU

GENMAB A/S

15-Apr-2025

3:57:51 PM

53

1295.00

CEUX

GENMAB A/S

15-Apr-2025

3:58:15 PM

35

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:58:15 PM

28

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:58:15 PM

46

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:58:15 PM

5

1295.00

XCSE

GENMAB A/S

15-Apr-2025

3:58:15 PM

34

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:21 PM

48

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:21 PM

27

1294.50

TQEX

GENMAB A/S

15-Apr-2025

3:58:42 PM

85

1294.50

CEUX

GENMAB A/S

15-Apr-2025

3:58:44 PM

48

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:44 PM

35

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:44 PM

15

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:44 PM

16

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:46 PM

25

1294.00

AQEU

GENMAB A/S

15-Apr-2025

3:58:54 PM

35

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:58:54 PM

17

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:58:54 PM

14

1294.00

XCSE

GENMAB A/S

15-Apr-2025

3:58:54 PM

9

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:54 PM

27

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:54 PM

12

1294.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:54 PM

24

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:58:54 PM

32

1294.00

AQEU

GENMAB A/S

15-Apr-2025

3:58:54 PM

32

1293.50

CEUX

GENMAB A/S

15-Apr-2025

3:58:54 PM

31

1293.50

CEUX

GENMAB A/S

15-Apr-2025

3:59:08 PM

61

1293.50

XCSE

GENMAB A/S

15-Apr-2025

3:59:08 PM

28

1293.50

CEUX

GENMAB A/S

15-Apr-2025

3:59:20 PM

87

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:59:20 PM

31

1292.50

TQEX

GENMAB A/S

15-Apr-2025

3:59:20 PM

90

1292.50

CEUX

GENMAB A/S

15-Apr-2025

3:59:21 PM

25

1292.50

AQEU

GENMAB A/S

15-Apr-2025

3:59:41 PM

42

1293.00

XCSE

GENMAB A/S

15-Apr-2025

3:59:46 PM

36

1292.50

XCSE

122


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

3:59:46 PM

90

1292.00

XCSE

GENMAB A/S

15-Apr-2025

3:59:46 PM

82

1292.50

CEUX

GENMAB A/S

15-Apr-2025

3:59:46 PM

7

1292.50

CEUX

GENMAB A/S

15-Apr-2025

3:59:59 PM

64

1291.50

XCSE

GENMAB A/S

15-Apr-2025

3:59:59 PM

27

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:00:14 PM

85

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:00:21 PM

89

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:00:48 PM

90

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:00:58 PM

37

1292.50

AQEU

GENMAB A/S

15-Apr-2025

4:01:11 PM

31

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:01:11 PM

80

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:01:11 PM

4

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:01:12 PM

71

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:01:12 PM

14

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:01:18 PM

20

1291.00

TQEX

GENMAB A/S

15-Apr-2025

4:01:18 PM

17

1291.00

TQEX

GENMAB A/S

15-Apr-2025

4:01:18 PM

84

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:01:19 PM

84

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:01:28 PM

85

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:01:45 PM

77

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:01:45 PM

7

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:02:00 PM

87

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:02:00 PM

85

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:02:00 PM

88

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:02:14 PM

86

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:02:14 PM

46

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:02:24 PM

72

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:02:24 PM

52

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:02:24 PM

25

1288.50

AQEU

GENMAB A/S

15-Apr-2025

4:02:57 PM

27

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:03:00 PM

81

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:03:20 PM

15

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:03:20 PM

73

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:03:20 PM

19

1290.00

TQEX

GENMAB A/S

15-Apr-2025

4:03:20 PM

16

1290.00

TQEX

GENMAB A/S

15-Apr-2025

4:03:23 PM

31

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:03:23 PM

25

1289.50

AQEU

GENMAB A/S

15-Apr-2025

4:03:24 PM

88

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:03:24 PM

28

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:03:24 PM

8

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:03:26 PM

86

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:03:26 PM

2

1288.50

AQEU

GENMAB A/S

15-Apr-2025

4:03:53 PM

87

1288.00

XCSE

123


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:03:53 PM

37

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:03:53 PM

15

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:04:13 PM

44

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:04:17 PM

22

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:04:17 PM

14

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:04:17 PM

34

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:04:22 PM

88

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:04:22 PM

36

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:04:34 PM

87

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:04:34 PM

2

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:04:34 PM

26

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:04:35 PM

36

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:05:01 PM

87

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:05:13 PM

27

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:05:13 PM

11

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:05:22 PM

44

1286.00

CEUX

GENMAB A/S

15-Apr-2025

4:05:23 PM

69

1285.50

XCSE

GENMAB A/S

15-Apr-2025

4:05:23 PM

19

1285.50

XCSE

GENMAB A/S

15-Apr-2025

4:05:37 PM

50

1285.00

XCSE

GENMAB A/S

15-Apr-2025

4:05:37 PM

39

1285.00

XCSE

GENMAB A/S

15-Apr-2025

4:05:37 PM

27

1285.00

CEUX

GENMAB A/S

15-Apr-2025

4:06:29 PM

35

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:06:29 PM

29

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:06:29 PM

46

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:06:30 PM

85

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:06:31 PM

100

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:06:46 PM

36

1288.50

TQEX

GENMAB A/S

15-Apr-2025

4:07:01 PM

89

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:07:01 PM

77

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:07:02 PM

32

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:07:31 PM

89

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:07:31 PM

33

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:08:20 PM

46

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:08:20 PM

29

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:08:20 PM

52

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:08:20 PM

32

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:08:20 PM

36

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:08:38 PM

27

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:08:51 PM

84

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:08:53 PM

32

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:09:02 PM

35

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:02 PM

13

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:02 PM

32

1288.50

CEUX

124


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:09:03 PM

35

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:03 PM

28

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:03 PM

46

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:03 PM

40

1288.00

TQEX

GENMAB A/S

15-Apr-2025

4:09:03 PM

66

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:09:03 PM

21

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:09:03 PM

42

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:09:15 PM

35

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:09:15 PM

15

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:09:15 PM

46

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:09:33 PM

49

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:33 PM

35

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:33 PM

16

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:50 PM

50

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:50 PM

86

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:09:50 PM

87

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

2

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

3

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

5

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

15

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

10

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

2

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

7

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

2

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

24

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

7

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:09:50 PM

3

1289.50

AQEU

GENMAB A/S

15-Apr-2025

4:09:56 PM

90

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

16

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:10:22 PM

34

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:10:22 PM

6

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

18

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

9

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

5

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

7

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

19

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

2

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

2

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:22 PM

9

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:10:23 PM

15

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:10:23 PM

10

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:10:23 PM

89

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:10:51 PM

48

1292.00

XCSE

125


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:10:51 PM

15

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:10:51 PM

62

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:11:04 PM

14

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:11:07 PM

2

1292.50

TQEX

GENMAB A/S

15-Apr-2025

4:11:07 PM

3

1292.50

TQEX

GENMAB A/S

15-Apr-2025

4:11:26 PM

64

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:11:26 PM

26

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:11:26 PM

4

1292.50

TQEX

GENMAB A/S

15-Apr-2025

4:11:26 PM

24

1292.50

TQEX

GENMAB A/S

15-Apr-2025

4:11:26 PM

24

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:11:26 PM

8

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:11:26 PM

2

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:11:26 PM

25

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:11:26 PM

3

1292.50

AQEU

GENMAB A/S

15-Apr-2025

4:11:26 PM

34

1292.50

AQEU

GENMAB A/S

15-Apr-2025

4:11:51 PM

14

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:11:51 PM

16

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:11:52 PM

18

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:11:52 PM

14

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:11:52 PM

18

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:11:52 PM

14

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:12:11 PM

85

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:12:11 PM

70

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:12:11 PM

28

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:12:11 PM

16

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:12:11 PM

27

1292.00

TQEX

GENMAB A/S

15-Apr-2025

4:12:11 PM

81

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:12:11 PM

42

1293.00

AQEU

GENMAB A/S

15-Apr-2025

4:12:12 PM

64

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:12:12 PM

20

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:12:30 PM

89

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:12:30 PM

76

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:12:49 PM

59

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:12:49 PM

42

1292.50

TQEX

GENMAB A/S

15-Apr-2025

4:12:49 PM

54

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:13:27 PM

15

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:13:27 PM

2

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:13:27 PM

8

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:13:27 PM

3

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:27 PM

4

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:27 PM

12

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:28 PM

16

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:13:28 PM

10

1293.00

CEUX

126


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:13:28 PM

20

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:13:28 PM

10

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:13:28 PM

10

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:13:28 PM

10

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:13:28 PM

6

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:13:28 PM

3

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:13:43 PM

17

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:43 PM

14

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:43 PM

20

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:43 PM

35

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:43 PM

28

1293.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:45 PM

60

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:13:45 PM

34

1293.00

CEUX

GENMAB A/S

15-Apr-2025

4:14:07 PM

65

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:14:12 PM

9

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:14:12 PM

75

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:14:19 PM

57

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:14:24 PM

6

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:24 PM

20

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:24 PM

20

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:24 PM

9

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:24 PM

33

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:34 PM

3

1290.50

TQEX

GENMAB A/S

15-Apr-2025

4:14:41 PM

42

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:41 PM

32

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:41 PM

23

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:14:41 PM

8

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:14:46 PM

31

1290.00

AQEU

GENMAB A/S

15-Apr-2025

4:14:54 PM

91

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:14:54 PM

37

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:15:24 PM

79

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:15:34 PM

28

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:15:51 PM

2

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:15:51 PM

3

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:15:51 PM

7

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:15:51 PM

8

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:15:51 PM

65

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:15:51 PM

10

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:15:51 PM

24

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:15:51 PM

5

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:15:51 PM

10

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:15:51 PM

40

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:15:51 PM

10

1289.50

CEUX

127


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:15:51 PM

5

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:15:51 PM

3

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:16:25 PM

2

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:16:25 PM

68

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:16:30 PM

114

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:16:32 PM

4

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:16:32 PM

7

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:16:32 PM

10

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:16:32 PM

3

1291.00

AQEU

GENMAB A/S

15-Apr-2025

4:16:32 PM

5

1291.00

AQEU

GENMAB A/S

15-Apr-2025

4:16:32 PM

20

1291.00

AQEU

GENMAB A/S

15-Apr-2025

4:16:43 PM

1

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:16:49 PM

15

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:16:49 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:16:49 PM

18

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:16:49 PM

15

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:16:49 PM

9

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:17:15 PM

85

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:17:15 PM

4

1291.00

TQEX

GENMAB A/S

15-Apr-2025

4:17:15 PM

35

1291.00

TQEX

GENMAB A/S

15-Apr-2025

4:17:15 PM

67

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:17:15 PM

4

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:17:30 PM

84

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:17:30 PM

38

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:17:31 PM

84

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:17:31 PM

47

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:17:34 PM

91

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:17:34 PM

37

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:17:35 PM

85

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:17:42 PM

26

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:17:49 PM

38

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:17:49 PM

4

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:17:57 PM

26

1285.50

XCSE

GENMAB A/S

15-Apr-2025

4:17:57 PM

25

1285.50

CEUX

GENMAB A/S

15-Apr-2025

4:17:57 PM

25

1285.50

AQEU

GENMAB A/S

15-Apr-2025

4:18:00 PM

43

1285.00

CEUX

GENMAB A/S

15-Apr-2025

4:18:06 PM

28

1285.50

XCSE

GENMAB A/S

15-Apr-2025

4:18:43 PM

47

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:18:49 PM

39

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:18:57 PM

1

1286.00

AQEU

GENMAB A/S

15-Apr-2025

4:18:57 PM

24

1286.00

AQEU

GENMAB A/S

15-Apr-2025

4:19:03 PM

3

1285.50

XCSE

GENMAB A/S

15-Apr-2025

4:19:03 PM

27

1285.50

CEUX

128


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:19:21 PM

31

1284.50

XCSE

GENMAB A/S

15-Apr-2025

4:19:21 PM

26

1284.50

CEUX

GENMAB A/S

15-Apr-2025

4:19:33 PM

15

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:19:33 PM

49

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:19:34 PM

29

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:19:51 PM

28

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:19:51 PM

5

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:19:51 PM

57

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:20:02 PM

17

1284.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:02 PM

10

1284.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:02 PM

6

1284.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:02 PM

15

1284.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:16 PM

90

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:20:16 PM

31

1284.50

XCSE

GENMAB A/S

15-Apr-2025

4:20:18 PM

41

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

8

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

3

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

8

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

3

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

3

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

3

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

2

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

2

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

7

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

3

1283.50

CEUX

GENMAB A/S

15-Apr-2025

4:20:18 PM

45

1284.00

AQEU

GENMAB A/S

15-Apr-2025

4:20:34 PM

24

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:20:34 PM

15

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:20:34 PM

52

1284.00

XCSE

GENMAB A/S

15-Apr-2025

4:20:34 PM

26

1284.00

CEUX

GENMAB A/S

15-Apr-2025

4:20:51 PM

36

1284.50

CEUX

GENMAB A/S

15-Apr-2025

4:21:10 PM

30

1285.50

CEUX

GENMAB A/S

15-Apr-2025

4:21:13 PM

48

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:21:13 PM

35

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:21:13 PM

17

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:21:25 PM

19

1285.50

CEUX

GENMAB A/S

15-Apr-2025

4:21:25 PM

6

1285.50

CEUX

GENMAB A/S

15-Apr-2025

4:21:54 PM

88

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:21:54 PM

10

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:21:54 PM

20

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:21:54 PM

13

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:21:54 PM

5

1286.00

AQEU

GENMAB A/S

15-Apr-2025

4:21:54 PM

20

1286.00

AQEU

129


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:21:54 PM

6

1286.00

AQEU

GENMAB A/S

15-Apr-2025

4:21:54 PM

5

1286.00

AQEU

GENMAB A/S

15-Apr-2025

4:21:54 PM

2

1286.00

AQEU

GENMAB A/S

15-Apr-2025

4:22:03 PM

3

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:22:03 PM

6

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:22:03 PM

20

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:22:03 PM

5

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:22:03 PM

17

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:22:03 PM

5

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:22:13 PM

3

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:22:23 PM

2

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:22:38 PM

62

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:22:38 PM

29

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:22:39 PM

20

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:22:48 PM

1

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:22:53 PM

5

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:22:53 PM

24

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:22:54 PM

114

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:23:14 PM

34

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:23:14 PM

13

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:23:14 PM

57

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:23:49 PM

62

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:23:49 PM

89

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:24:02 PM

4

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:24:02 PM

8

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:24:02 PM

2

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:24:02 PM

11

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:24:02 PM

3

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:24:02 PM

22

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:24:02 PM

2

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:24:02 PM

68

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:24:02 PM

16

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:24:02 PM

20

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:24:41 PM

21

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:24:41 PM

91

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:24:41 PM

32

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:25:32 PM

57

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:32 PM

29

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:32 PM

18

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:32 PM

10

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:32 PM

59

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:32 PM

11

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:25:38 PM

45

1289.00

XCSE

130


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:25:40 PM

5

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:57 PM

30

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:57 PM

57

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:57 PM

18

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:57 PM

9

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:57 PM

2

1288.50

TQEX

GENMAB A/S

15-Apr-2025

4:25:57 PM

16

1288.50

TQEX

GENMAB A/S

15-Apr-2025

4:25:57 PM

2

1288.50

TQEX

GENMAB A/S

15-Apr-2025

4:25:57 PM

20

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:25:57 PM

36

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:25:57 PM

7

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:25:57 PM

64

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:25:58 PM

47

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:58 PM

15

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:25:58 PM

52

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:26:03 PM

10

1288.50

TQEX

GENMAB A/S

15-Apr-2025

4:26:08 PM

37

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:26:08 PM

64

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:26:08 PM

24

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:26:08 PM

3

1288.50

TQEX

GENMAB A/S

15-Apr-2025

4:26:17 PM

28

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:26:17 PM

59

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:26:17 PM

27

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:26:17 PM

39

1287.50

AQEU

GENMAB A/S

15-Apr-2025

4:27:06 PM

114

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:27:06 PM

59

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:27:09 PM

30

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:27:09 PM

2

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:27:09 PM

32

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:27:09 PM

5

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:27:28 PM

38

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:27:29 PM

26

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:27:41 PM

3

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:27:58 PM

90

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:28:00 PM

36

1289.00

AQEU

GENMAB A/S

15-Apr-2025

4:28:19 PM

81

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:28:52 PM

86

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:52 PM

10

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:52 PM

10

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:52 PM

15

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:52 PM

13

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:52 PM

17

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:52 PM

15

1289.50

XCSE

131


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:28:52 PM

10

1289.50

TQEX

GENMAB A/S

15-Apr-2025

4:28:52 PM

34

1289.50

TQEX

GENMAB A/S

15-Apr-2025

4:28:52 PM

1

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:28:58 PM

89

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

18

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

18

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

4

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

2

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

5

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

3

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

3

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

3

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

10

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

35

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:28:58 PM

13

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:29:21 PM

45

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:29:21 PM

36

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:29:21 PM

7

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:29:21 PM

6

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:29:37 PM

46

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:29:37 PM

15

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:29:37 PM

18

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:29:37 PM

57

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:29:37 PM

17

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:29:37 PM

7

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:29:37 PM

4

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:29:37 PM

8

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:29:37 PM

7

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:29:37 PM

5

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:29:37 PM

3

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:29:37 PM

23

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:29:37 PM

58

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:30:02 PM

45

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:30:02 PM

31

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:30:03 PM

55

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:30:15 PM

8

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:30:24 PM

14

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:30:28 PM

47

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:30:28 PM

7

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:30:29 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:30:33 PM

82

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:30:33 PM

5

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:30:33 PM

70

1286.50

CEUX

132


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:30:33 PM

21

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:31:00 PM

32

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:31:12 PM

57

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:31:12 PM

15

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:31:12 PM

15

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:31:12 PM

18

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:31:12 PM

9

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:31:12 PM

15

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:31:12 PM

10

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:31:12 PM

15

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:31:12 PM

38

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:31:21 PM

13

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:31:51 PM

91

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:31:51 PM

2

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:31:51 PM

43

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:32:02 PM

13

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:32:02 PM

20

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:32:02 PM

2

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:32:11 PM

32

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:32:12 PM

35

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:18 PM

35

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:32:18 PM

90

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:36 PM

3

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:36 PM

4

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:32:36 PM

36

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:32:36 PM

8

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:32:36 PM

14

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:32:36 PM

11

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:32:38 PM

48

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:38 PM

17

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:38 PM

14

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:38 PM

17

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:38 PM

18

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:43 PM

48

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:43 PM

1

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:32:43 PM

36

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:32:43 PM

2

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:33:28 PM

87

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

4

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

5

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

5

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

6

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

3

1287.50

XCSE

133


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:34:08 PM

2

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

15

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

3

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

16

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:34:08 PM

22

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:34:08 PM

4

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

36

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

8

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

8

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

26

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

1

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

32

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

10

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

22

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:08 PM

25

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:34:20 PM

50

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:20 PM

10

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:20 PM

5

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:20 PM

10

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:20 PM

5

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:20 PM

5

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:20 PM

5

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:20 PM

15

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:34:20 PM

10

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:34:21 PM

15

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:21 PM

15

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:21 PM

57

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:21 PM

27

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:21 PM

18

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:21 PM

24

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:21 PM

15

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:21 PM

15

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:34:47 PM

16

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:47 PM

26

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:47 PM

18

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:47 PM

34

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:47 PM

20

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:47 PM

32

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:47 PM

59

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:48 PM

47

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:48 PM

16

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:48 PM

17

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:48 PM

15

1288.00

XCSE

134


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:34:48 PM

14

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:48 PM

32

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:34:49 PM

3

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:49 PM

5

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:49 PM

11

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

14

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

3

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

4

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

4

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

6

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

15

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

5

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:49 PM

5

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:34:55 PM

32

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:34:55 PM

3

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:55 PM

20

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:34:55 PM

6

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:35:03 PM

34

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:35:03 PM

34

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:35:11 PM

79

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:35:11 PM

2

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:35:11 PM

31

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:35:40 PM

31

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:35:41 PM

26

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:35:41 PM

14

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:36:03 PM

4

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:03 PM

57

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:03 PM

2

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:36:03 PM

4

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:03 PM

3

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:03 PM

22

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:03 PM

25

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:03 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:14 PM

74

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:14 PM

4

1288.00

TQEX

GENMAB A/S

15-Apr-2025

4:36:14 PM

21

1288.00

TQEX

GENMAB A/S

15-Apr-2025

4:36:14 PM

7

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:14 PM

27

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:14 PM

2

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:36:14 PM

3

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:36:15 PM

9

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:15 PM

9

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:15 PM

7

1288.00

XCSE

135


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:36:15 PM

21

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:36:17 PM

65

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:17 PM

7

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:17 PM

10

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:17 PM

12

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:17 PM

3

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:17 PM

7

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:17 PM

12

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:36:36 PM

39

1288.50

CEUX

GENMAB A/S

15-Apr-2025

4:36:37 PM

37

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:43 PM

45

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:36:49 PM

47

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:36:49 PM

28

1288.50

AQEU

GENMAB A/S

15-Apr-2025

4:36:50 PM

18

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:36:50 PM

28

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:37:11 PM

24

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:37:11 PM

28

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:37:11 PM

7

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:37:21 PM

74

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:37:21 PM

9

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:37:25 PM

3

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:37:25 PM

2

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:37:25 PM

11

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:37:25 PM

12

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:37:35 PM

45

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:37:35 PM

10

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:37:35 PM

26

1286.00

CEUX

GENMAB A/S

15-Apr-2025

4:37:39 PM

78

1286.00

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

12

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

2

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

3

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

3

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

8

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

3

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

14

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

25

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

9

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

8

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:38:10 PM

4

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:38:10 PM

9

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:38:10 PM

4

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:38:10 PM

4

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:38:10 PM

7

1286.00

TQEX

136


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:38:31 PM

15

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:38:31 PM

36

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:38:31 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:38:31 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:39:01 PM

1

1286.00

TQEX

GENMAB A/S

15-Apr-2025

4:39:01 PM

69

1286.00

CEUX

GENMAB A/S

15-Apr-2025

4:39:01 PM

36

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:39:01 PM

3

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:39:01 PM

32

1286.50

AQEU

GENMAB A/S

15-Apr-2025

4:39:34 PM

8

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:34 PM

35

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:34 PM

16

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:34 PM

15

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:34 PM

48

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:34 PM

15

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:39:34 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:39:34 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:39:35 PM

15

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:35 PM

19

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:35 PM

17

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:36 PM

17

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:36 PM

16

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:36 PM

7

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:39:36 PM

7

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:39:41 PM

15

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:41 PM

21

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:41 PM

57

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:41 PM

15

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:39:59 PM

4

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:39:59 PM

2

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:39:59 PM

5

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:39:59 PM

62

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:39:59 PM

2

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:03 PM

29

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:40:03 PM

19

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:40:03 PM

7

1287.50

TQEX

GENMAB A/S

15-Apr-2025

4:40:03 PM

3

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:03 PM

76

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:03 PM

5

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:03 PM

20

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:03 PM

4

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:03 PM

18

1287.50

AQEU

GENMAB A/S

15-Apr-2025

4:40:03 PM

3

1287.50

AQEU

137


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:40:03 PM

3

1287.50

AQEU

GENMAB A/S

15-Apr-2025

4:40:03 PM

2

1287.50

AQEU

GENMAB A/S

15-Apr-2025

4:40:12 PM

15

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:40:12 PM

21

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:40:12 PM

57

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:40:12 PM

15

1287.50

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

15

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

15

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

25

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

57

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

2

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

78

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

11

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:40:27 PM

10

1286.50

TQEX

GENMAB A/S

15-Apr-2025

4:40:27 PM

36

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:40:27 PM

5

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:27 PM

15

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:27 PM

3

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:27 PM

10

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:27 PM

2

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:40:27 PM

45

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:41:02 PM

85

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:41:15 PM

36

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:41:15 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:41:15 PM

21

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:41:31 PM

35

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:41:43 PM

7

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:41:43 PM

6

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:41:43 PM

11

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:41:43 PM

40

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:42:01 PM

27

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:01 PM

7

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:01 PM

7

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:01 PM

17

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:01 PM

35

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:01 PM

11

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:02 PM

8

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:02 PM

7

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:02 PM

13

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:07 PM

6

1286.50

CEUX

GENMAB A/S

15-Apr-2025

4:42:07 PM

10

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:42:07 PM

10

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:42:07 PM

10

1287.00

AQEU

138


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:42:07 PM

4

1287.00

AQEU

GENMAB A/S

15-Apr-2025

4:42:16 PM

8

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:42:16 PM

25

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:42:16 PM

25

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:42:21 PM

66

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:42:29 PM

10

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:29 PM

6

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:29 PM

2

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:29 PM

3

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:29 PM

6

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:29 PM

5

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:29 PM

1

1287.00

TQEX

GENMAB A/S

15-Apr-2025

4:42:46 PM

57

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:42:46 PM

19

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:42:46 PM

27

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:42:46 PM

19

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:42:46 PM

18

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:42:46 PM

14

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:42:47 PM

114

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:42:47 PM

13

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:43:01 PM

23

1286.50

XCSE

GENMAB A/S

15-Apr-2025

4:43:01 PM

51

1287.00

CEUX

GENMAB A/S

15-Apr-2025

4:43:31 PM

74

1287.00

XCSE

GENMAB A/S

15-Apr-2025

4:43:31 PM

50

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:43:31 PM

36

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:43:31 PM

26

1287.50

CEUX

GENMAB A/S

15-Apr-2025

4:43:37 PM

2

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:43:37 PM

5

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:43:37 PM

80

1288.00

XCSE

GENMAB A/S

15-Apr-2025

4:43:37 PM

8

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:43:37 PM

7

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:43:37 PM

5

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:43:37 PM

5

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:43:37 PM

2

1288.00

CEUX

GENMAB A/S

15-Apr-2025

4:43:37 PM

2

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:43:37 PM

10

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:43:37 PM

13

1288.00

AQEU

GENMAB A/S

15-Apr-2025

4:44:07 PM

24

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:44:07 PM

5

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:44:08 PM

87

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:08 PM

2

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:08 PM

15

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:08 PM

19

1289.00

CEUX

139


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:44:08 PM

7

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:08 PM

21

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:41 PM

36

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:41 PM

25

1289.00

AQEU

GENMAB A/S

15-Apr-2025

4:44:45 PM

35

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:45 PM

22

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:45 PM

57

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:45 PM

32

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:46 PM

18

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

19

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

35

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

19

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

35

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

15

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

18

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

16

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:46 PM

30

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:53 PM

45

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:53 PM

12

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:44:53 PM

2

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:44:53 PM

8

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:44:53 PM

15

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:44:53 PM

12

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:53 PM

13

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:53 PM

6

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:53 PM

28

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:53 PM

3

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:53 PM

11

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:53 PM

3

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:44:53 PM

7

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:45:09 PM

10

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:09 PM

32

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:10 PM

35

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:14 PM

25

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:15 PM

49

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:15 PM

35

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:15 PM

30

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:22 PM

57

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:22 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:22 PM

9

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:22 PM

2

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:22 PM

2

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:22 PM

5

1289.50

CEUX

140


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:45:22 PM

7

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:26 PM

35

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:26 PM

15

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:26 PM

35

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:26 PM

29

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:26 PM

3

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:26 PM

17

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:29 PM

2

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:54 PM

32

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:45:56 PM

19

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:56 PM

23

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:56 PM

57

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:56 PM

15

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:45:59 PM

24

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:59 PM

57

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:45:59 PM

2

1290.50

TQEX

GENMAB A/S

15-Apr-2025

4:46:00 PM

57

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:00 PM

15

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:03 PM

42

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:46:03 PM

9

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:46:07 PM

5

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:07 PM

3

1290.50

TQEX

GENMAB A/S

15-Apr-2025

4:46:07 PM

36

1290.50

TQEX

GENMAB A/S

15-Apr-2025

4:46:07 PM

42

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:46:07 PM

30

1290.50

AQEU

GENMAB A/S

15-Apr-2025

4:46:13 PM

71

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:13 PM

32

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:46:13 PM

28

1291.00

AQEU

GENMAB A/S

15-Apr-2025

4:46:14 PM

2

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:14 PM

2

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:14 PM

2

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:14 PM

3

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:15 PM

29

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:46:17 PM

87

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:17 PM

1

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:17 PM

49

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:17 PM

17

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:17 PM

18

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:17 PM

15

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:17 PM

26

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:46:18 PM

5

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:18 PM

11

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:18 PM

4

1289.00

XCSE

141


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:46:18 PM

11

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:18 PM

25

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:46:42 PM

35

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:46:50 PM

40

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:46:50 PM

39

1290.50

TQEX

GENMAB A/S

15-Apr-2025

4:47:00 PM

32

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:47:00 PM

11

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:47:00 PM

48

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:47:01 PM

18

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:47:01 PM

7

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:47:11 PM

28

1290.50

AQEU

GENMAB A/S

15-Apr-2025

4:47:12 PM

42

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:47:29 PM

30

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:47:30 PM

15

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:07 PM

35

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:48:07 PM

28

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:48:07 PM

15

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:48:07 PM

15

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:48:07 PM

21

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:48:07 PM

38

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:48:07 PM

29

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:48:16 PM

2

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:21 PM

88

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:21 PM

61

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:48:21 PM

10

1290.00

AQEU

GENMAB A/S

15-Apr-2025

4:48:27 PM

36

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:48:27 PM

7

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:48:27 PM

7

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:48:27 PM

29

1290.00

AQEU

GENMAB A/S

15-Apr-2025

4:48:28 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:28 PM

15

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:28 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:28 PM

15

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:41 PM

15

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:48:41 PM

19

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:48:41 PM

88

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:49 PM

64

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:48:52 PM

25

1290.00

TQEX

GENMAB A/S

15-Apr-2025

4:48:53 PM

57

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:53 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:48:53 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:49:01 PM

22

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:50:08 PM

36

1289.50

CEUX

142


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:50:08 PM

31

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:50:17 PM

36

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:17 PM

8

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:17 PM

8

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:18 PM

20

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:31 PM

36

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:37 PM

13

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:38 PM

16

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:40 PM

7

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:44 PM

15

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:46 PM

10

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:46 PM

17

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:46 PM

19

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:46 PM

15

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:46 PM

34

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:46 PM

8

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:46 PM

8

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:46 PM

22

1289.50

CEUX

GENMAB A/S

15-Apr-2025

4:50:48 PM

15

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:50:48 PM

17

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:50:48 PM

36

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:50:48 PM

46

1289.00

XCSE

GENMAB A/S

15-Apr-2025

4:50:48 PM

42

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:48 PM

36

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:50:48 PM

21

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:50:48 PM

26

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:50:48 PM

99

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:50:49 PM

1

1288.50

XCSE

GENMAB A/S

15-Apr-2025

4:50:49 PM

30

1288.50

TQEX

GENMAB A/S

15-Apr-2025

4:50:49 PM

25

1288.50

AQEU

GENMAB A/S

15-Apr-2025

4:50:49 PM

4

1288.50

AQEU

GENMAB A/S

15-Apr-2025

4:50:49 PM

4

1288.50

AQEU

GENMAB A/S

15-Apr-2025

4:50:50 PM

6

1288.50

AQEU

GENMAB A/S

15-Apr-2025

4:51:01 PM

26

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:51:01 PM

38

1289.00

CEUX

GENMAB A/S

15-Apr-2025

4:51:03 PM

11

1289.00

TQEX

GENMAB A/S

15-Apr-2025

4:51:07 PM

17

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:07 PM

18

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:08 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:08 PM

57

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:08 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:08 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:09 PM

27

1290.00

CEUX

143


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:51:12 PM

15

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:13 PM

19

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:13 PM

18

1290.00

XCSE

GENMAB A/S

15-Apr-2025

4:51:13 PM

16

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:51:19 PM

32

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:51:20 PM

46

1289.50

XCSE

GENMAB A/S

15-Apr-2025

4:51:24 PM

31

1290.00

CEUX

GENMAB A/S

15-Apr-2025

4:51:35 PM

85

1290.50

XCSE

GENMAB A/S

15-Apr-2025

4:51:35 PM

36

1290.50

CEUX

GENMAB A/S

15-Apr-2025

4:51:40 PM

20

1290.50

TQEX

GENMAB A/S

15-Apr-2025

4:51:40 PM

13

1290.50

TQEX

GENMAB A/S

15-Apr-2025

4:51:47 PM

7

1290.50

AQEU

GENMAB A/S

15-Apr-2025

4:51:49 PM

5

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:51:53 PM

18

1291.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:01 PM

18

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:52:02 PM

5

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:52:02 PM

5

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:52:02 PM

15

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:52:02 PM

2

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:52:02 PM

12

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:52:07 PM

3

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:28 PM

9

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:28 PM

38

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:28 PM

6

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:41 PM

36

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:42 PM

36

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:45 PM

17

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:45 PM

19

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:45 PM

15

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:45 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:45 PM

6

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:45 PM

36

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:46 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

13

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

16

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

19

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

17

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

13

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

16

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

17

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

21

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:46 PM

19

1292.00

XCSE

144


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:52:46 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:47 PM

27

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:47 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:47 PM

18

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:47 PM

13

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:47 PM

17

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:47 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:48 PM

17

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:48 PM

18

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:48 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:48 PM

17

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:48 PM

5

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:49 PM

16

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:49 PM

16

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:49 PM

57

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:49 PM

18

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:49 PM

12

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:49 PM

40

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:53 PM

36

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:53 PM

11

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:52:56 PM

57

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:52:56 PM

10

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:52:56 PM

19

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:52:56 PM

55

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:52:56 PM

33

1291.50

AQEU

GENMAB A/S

15-Apr-2025

4:52:56 PM

13

1291.50

AQEU

GENMAB A/S

15-Apr-2025

4:52:59 PM

33

1291.00

XCSE

GENMAB A/S

15-Apr-2025

4:53:02 PM

6

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:53:03 PM

3

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:53:03 PM

5

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:53:03 PM

12

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:53:06 PM

46

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:53:21 PM

18

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:53:21 PM

28

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:53:26 PM

34

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:53:26 PM

57

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:53:26 PM

13

1293.00

XCSE

GENMAB A/S

15-Apr-2025

4:53:26 PM

8

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:53:26 PM

7

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:53:41 PM

80

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:54:01 PM

5

1292.00

XCSE

GENMAB A/S

15-Apr-2025

4:54:01 PM

27

1292.00

TQEX

GENMAB A/S

15-Apr-2025

4:54:01 PM

6

1291.50

TQEX

145


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:54:01 PM

2

1291.50

TQEX

GENMAB A/S

15-Apr-2025

4:54:01 PM

4

1291.50

TQEX

GENMAB A/S

15-Apr-2025

4:54:01 PM

2

1291.50

TQEX

GENMAB A/S

15-Apr-2025

4:54:01 PM

9

1291.50

TQEX

GENMAB A/S

15-Apr-2025

4:54:01 PM

2

1291.50

TQEX

GENMAB A/S

15-Apr-2025

4:54:01 PM

25

1292.00

CEUX

GENMAB A/S

15-Apr-2025

4:54:01 PM

7

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:01 PM

3

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:01 PM

2

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:01 PM

14

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:01 PM

6

1291.50

AQEU

GENMAB A/S

15-Apr-2025

4:54:01 PM

12

1291.50

AQEU

GENMAB A/S

15-Apr-2025

4:54:07 PM

1

1291.50

AQEU

GENMAB A/S

15-Apr-2025

4:54:12 PM

29

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:12 PM

19

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:12 PM

17

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:12 PM

35

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:12 PM

8

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

8

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

8

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

8

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

28

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

12

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

5

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

21

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

7

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

8

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

7

1291.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:12 PM

17

1291.50

AQEU

GENMAB A/S

15-Apr-2025

4:54:13 PM

29

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:13 PM

19

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:13 PM

16

1291.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

18

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

18

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

35

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

16

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

27

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

30

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

16

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

14

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:18 PM

10

1292.50

XCSE

GENMAB A/S

15-Apr-2025

4:54:31 PM

26

1291.50

TQEX

GENMAB A/S

15-Apr-2025

4:54:49 PM

33

1292.50

XCSE

146


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

15-Apr-2025

4:54:49 PM

32

1292.50

CEUX

GENMAB A/S

15-Apr-2025

4:54:50 PM

37

1292.00

AQEU

GENMAB A/S

16-Apr-2025

9:35:44 AM

81

1289.00

XCSE

GENMAB A/S

16-Apr-2025

9:35:44 AM

32

1289.00

CEUX

GENMAB A/S

16-Apr-2025

9:35:44 AM

58

1289.00

CEUX

GENMAB A/S

16-Apr-2025

9:39:30 AM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

9:39:30 AM

88

1290.50

TQEX

GENMAB A/S

16-Apr-2025

9:39:30 AM

29

1289.50

CEUX

GENMAB A/S

16-Apr-2025

9:39:30 AM

21

1290.50

AQEU

GENMAB A/S

16-Apr-2025

9:39:30 AM

65

1290.50

AQEU

GENMAB A/S

16-Apr-2025

9:39:30 AM

82

1289.50

AQEU

GENMAB A/S

16-Apr-2025

9:42:18 AM

15

1289.00

XCSE

GENMAB A/S

16-Apr-2025

9:42:18 AM

37

1289.00

XCSE

GENMAB A/S

16-Apr-2025

9:42:18 AM

75

1289.00

TQEX

GENMAB A/S

16-Apr-2025

9:43:05 AM

16

1289.00

XCSE

GENMAB A/S

16-Apr-2025

9:43:05 AM

10

1289.00

XCSE

GENMAB A/S

16-Apr-2025

9:43:05 AM

48

1289.50

CEUX

GENMAB A/S

16-Apr-2025

9:43:05 AM

28

1289.50

AQEU

GENMAB A/S

16-Apr-2025

9:43:09 AM

20

1289.00

TQEX

GENMAB A/S

16-Apr-2025

9:43:09 AM

16

1289.00

TQEX

GENMAB A/S

16-Apr-2025

9:43:13 AM

61

1288.50

CEUX

GENMAB A/S

16-Apr-2025

9:44:29 AM

11

1289.50

AQEU

GENMAB A/S

16-Apr-2025

9:44:32 AM

39

1289.50

XCSE

GENMAB A/S

16-Apr-2025

9:44:32 AM

20

1289.50

AQEU

GENMAB A/S

16-Apr-2025

9:45:04 AM

20

1289.00

CEUX

GENMAB A/S

16-Apr-2025

9:45:14 AM

43

1289.50

XCSE

GENMAB A/S

16-Apr-2025

9:46:28 AM

24

1289.00

CEUX

GENMAB A/S

16-Apr-2025

9:46:33 AM

19

1289.00

TQEX

GENMAB A/S

16-Apr-2025

9:46:33 AM

9

1289.00

TQEX

GENMAB A/S

16-Apr-2025

9:46:33 AM

12

1289.00

CEUX

GENMAB A/S

16-Apr-2025

9:49:04 AM

38

1288.50

XCSE

GENMAB A/S

16-Apr-2025

9:49:13 AM

37

1287.50

XCSE

GENMAB A/S

16-Apr-2025

9:49:13 AM

27

1287.50

CEUX

GENMAB A/S

16-Apr-2025

9:49:13 AM

4

1287.50

CEUX

GENMAB A/S

16-Apr-2025

9:49:25 AM

26

1286.50

XCSE

GENMAB A/S

16-Apr-2025

9:49:43 AM

33

1287.00

CEUX

GENMAB A/S

16-Apr-2025

9:49:43 AM

54

1287.00

CEUX

GENMAB A/S

16-Apr-2025

9:50:07 AM

64

1286.50

XCSE

GENMAB A/S

16-Apr-2025

9:50:24 AM

38

1286.00

CEUX

GENMAB A/S

16-Apr-2025

9:50:28 AM

27

1285.50

TQEX

GENMAB A/S

16-Apr-2025

9:51:02 AM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

9:51:25 AM

21

1284.50

CEUX

GENMAB A/S

16-Apr-2025

9:51:59 AM

67

1284.50

CEUX

147


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

9:52:00 AM

29

1284.50

TQEX

GENMAB A/S

16-Apr-2025

9:53:41 AM

45

1283.50

CEUX

GENMAB A/S

16-Apr-2025

9:56:20 AM

56

1283.50

XCSE

GENMAB A/S

16-Apr-2025

9:56:20 AM

46

1283.50

CEUX

GENMAB A/S

16-Apr-2025

9:56:29 AM

33

1283.00

TQEX

GENMAB A/S

16-Apr-2025

9:56:30 AM

23

1282.50

CEUX

GENMAB A/S

16-Apr-2025

9:56:44 AM

8

1283.00

TQEX

GENMAB A/S

16-Apr-2025

9:56:53 AM

88

1283.00

XCSE

GENMAB A/S

16-Apr-2025

9:56:53 AM

21

1283.00

TQEX

GENMAB A/S

16-Apr-2025

9:57:05 AM

67

1282.50

CEUX

GENMAB A/S

16-Apr-2025

9:58:25 AM

1

1282.00

XCSE

GENMAB A/S

16-Apr-2025

9:58:25 AM

1

1282.00

XCSE

GENMAB A/S

16-Apr-2025

9:58:25 AM

47

1282.00

XCSE

GENMAB A/S

16-Apr-2025

9:58:25 AM

28

1282.50

AQEU

GENMAB A/S

16-Apr-2025

9:58:29 AM

29

1282.00

TQEX

GENMAB A/S

16-Apr-2025

9:58:29 AM

32

1282.00

CEUX

GENMAB A/S

16-Apr-2025

9:58:29 AM

79

1281.50

CEUX

GENMAB A/S

16-Apr-2025

10:00:08 AM

92

1281.50

XCSE

GENMAB A/S

16-Apr-2025

10:00:19 AM

35

1281.00

TQEX

GENMAB A/S

16-Apr-2025

10:00:19 AM

15

1281.00

CEUX

GENMAB A/S

16-Apr-2025

10:00:19 AM

33

1281.00

AQEU

GENMAB A/S

16-Apr-2025

10:01:26 AM

91

1282.00

XCSE

GENMAB A/S

16-Apr-2025

10:01:26 AM

15

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:01:26 AM

13

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:01:28 AM

12

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:01:30 AM

61

1283.00

XCSE

GENMAB A/S

16-Apr-2025

10:02:26 AM

31

1283.00

XCSE

GENMAB A/S

16-Apr-2025

10:03:23 AM

36

1283.00

CEUX

GENMAB A/S

16-Apr-2025

10:03:23 AM

49

1283.00

CEUX

GENMAB A/S

16-Apr-2025

10:03:32 AM

38

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:03:32 AM

21

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:03:32 AM

35

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:03:59 AM

90

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:03:59 AM

7

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:03:59 AM

25

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:03:59 AM

41

1284.00

TQEX

GENMAB A/S

16-Apr-2025

10:03:59 AM

86

1284.00

CEUX

GENMAB A/S

16-Apr-2025

10:03:59 AM

25

1284.00

CEUX

GENMAB A/S

16-Apr-2025

10:03:59 AM

32

1284.00

CEUX

GENMAB A/S

16-Apr-2025

10:03:59 AM

36

1284.00

AQEU

GENMAB A/S

16-Apr-2025

10:03:59 AM

5

1284.00

AQEU

GENMAB A/S

16-Apr-2025

10:04:00 AM

23

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:04:35 AM

25

1284.00

XCSE

148


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

10:04:48 AM

50

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:00 AM

35

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:00 AM

28

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:00 AM

38

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:00 AM

16

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:00 AM

14

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:00 AM

38

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:00 AM

25

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:36 AM

4

1283.00

AQEU

GENMAB A/S

16-Apr-2025

10:05:50 AM

90

1283.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:50 AM

38

1283.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:50 AM

15

1283.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:50 AM

37

1283.00

XCSE

GENMAB A/S

16-Apr-2025

10:05:50 AM

88

1282.50

XCSE

GENMAB A/S

16-Apr-2025

10:05:50 AM

42

1283.00

TQEX

GENMAB A/S

16-Apr-2025

10:05:50 AM

88

1283.00

CEUX

GENMAB A/S

16-Apr-2025

10:05:50 AM

36

1283.00

CEUX

GENMAB A/S

16-Apr-2025

10:05:50 AM

76

1282.00

CEUX

GENMAB A/S

16-Apr-2025

10:05:50 AM

23

1283.00

AQEU

GENMAB A/S

16-Apr-2025

10:09:34 AM

26

1282.00

TQEX

GENMAB A/S

16-Apr-2025

10:09:34 AM

36

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:09:34 AM

10

1282.00

CEUX

GENMAB A/S

16-Apr-2025

10:09:34 AM

21

1282.00

AQEU

GENMAB A/S

16-Apr-2025

10:09:37 AM

5

1282.00

TQEX

GENMAB A/S

16-Apr-2025

10:09:43 AM

9

1282.00

AQEU

GENMAB A/S

16-Apr-2025

10:11:21 AM

3

1282.00

XCSE

GENMAB A/S

16-Apr-2025

10:11:21 AM

29

1282.00

XCSE

GENMAB A/S

16-Apr-2025

10:11:21 AM

19

1282.00

XCSE

GENMAB A/S

16-Apr-2025

10:11:22 AM

20

1282.00

CEUX

GENMAB A/S

16-Apr-2025

10:12:15 AM

90

1281.50

XCSE

GENMAB A/S

16-Apr-2025

10:14:29 AM

45

1281.50

XCSE

GENMAB A/S

16-Apr-2025

10:14:29 AM

10

1281.50

XCSE

GENMAB A/S

16-Apr-2025

10:14:29 AM

37

1281.50

XCSE

GENMAB A/S

16-Apr-2025

10:14:29 AM

22

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:14:29 AM

68

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:14:29 AM

31

1281.00

TQEX

GENMAB A/S

16-Apr-2025

10:14:29 AM

86

1280.50

CEUX

GENMAB A/S

16-Apr-2025

10:14:29 AM

28

1281.00

AQEU

GENMAB A/S

16-Apr-2025

10:14:30 AM

43

1280.00

XCSE

GENMAB A/S

16-Apr-2025

10:14:30 AM

45

1280.00

XCSE

GENMAB A/S

16-Apr-2025

10:14:30 AM

29

1280.00

XCSE

GENMAB A/S

16-Apr-2025

10:14:30 AM

45

1280.00

XCSE

GENMAB A/S

16-Apr-2025

10:14:30 AM

8

1280.00

XCSE

149


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

10:14:30 AM

27

1279.50

TQEX

GENMAB A/S

16-Apr-2025

10:14:30 AM

36

1280.00

CEUX

GENMAB A/S

16-Apr-2025

10:14:30 AM

7

1280.00

CEUX

GENMAB A/S

16-Apr-2025

10:14:30 AM

7

1280.00

CEUX

GENMAB A/S

16-Apr-2025

10:14:30 AM

51

1280.00

CEUX

GENMAB A/S

16-Apr-2025

10:14:30 AM

88

1279.50

CEUX

GENMAB A/S

16-Apr-2025

10:14:30 AM

67

1279.50

CEUX

GENMAB A/S

16-Apr-2025

10:14:30 AM

29

1280.00

AQEU

GENMAB A/S

16-Apr-2025

10:14:53 AM

90

1280.00

XCSE

GENMAB A/S

16-Apr-2025

10:14:55 AM

92

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:14:55 AM

5

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:16:37 AM

45

1281.00

XCSE

GENMAB A/S

16-Apr-2025

10:16:37 AM

19

1281.00

XCSE

GENMAB A/S

16-Apr-2025

10:16:37 AM

37

1281.00

XCSE

GENMAB A/S

16-Apr-2025

10:16:37 AM

44

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:16:37 AM

30

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:16:37 AM

18

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:17:00 AM

26

1280.00

TQEX

GENMAB A/S

16-Apr-2025

10:17:00 AM

25

1280.00

CEUX

GENMAB A/S

16-Apr-2025

10:17:00 AM

36

1280.50

CEUX

GENMAB A/S

16-Apr-2025

10:17:00 AM

7

1280.50

CEUX

GENMAB A/S

16-Apr-2025

10:17:00 AM

6

1280.50

CEUX

GENMAB A/S

16-Apr-2025

10:17:00 AM

25

1279.50

CEUX

GENMAB A/S

16-Apr-2025

10:17:41 AM

89

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:17:41 AM

90

1278.00

XCSE

GENMAB A/S

16-Apr-2025

10:17:41 AM

35

1278.00

XCSE

GENMAB A/S

16-Apr-2025

10:17:41 AM

45

1278.00

XCSE

GENMAB A/S

16-Apr-2025

10:17:41 AM

26

1279.00

TQEX

GENMAB A/S

16-Apr-2025

10:17:41 AM

27

1278.00

TQEX

GENMAB A/S

16-Apr-2025

10:17:41 AM

87

1278.00

CEUX

GENMAB A/S

16-Apr-2025

10:17:41 AM

36

1278.00

CEUX

GENMAB A/S

16-Apr-2025

10:17:41 AM

34

1279.00

AQEU

GENMAB A/S

16-Apr-2025

10:17:41 AM

27

1278.00

AQEU

GENMAB A/S

16-Apr-2025

10:18:26 AM

90

1278.00

XCSE

GENMAB A/S

16-Apr-2025

10:18:26 AM

93

1278.00

CEUX

GENMAB A/S

16-Apr-2025

10:18:26 AM

26

1278.00

AQEU

GENMAB A/S

16-Apr-2025

10:18:27 AM

47

1278.00

XCSE

GENMAB A/S

16-Apr-2025

10:18:27 AM

18

1278.00

CEUX

GENMAB A/S

16-Apr-2025

10:18:27 AM

8

1278.00

CEUX

GENMAB A/S

16-Apr-2025

10:18:29 AM

100

1278.50

XCSE

GENMAB A/S

16-Apr-2025

10:18:29 AM

100

1278.50

XCSE

GENMAB A/S

16-Apr-2025

10:18:30 AM

100

1278.50

XCSE

GENMAB A/S

16-Apr-2025

10:18:30 AM

47

1278.50

XCSE

150


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

10:20:25 AM

12

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:25 AM

45

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:25 AM

11

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:25 AM

12

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:25 AM

37

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:25 AM

89

1278.00

CEUX

GENMAB A/S

16-Apr-2025

10:20:25 AM

33

1278.50

CEUX

GENMAB A/S

16-Apr-2025

10:20:25 AM

56

1278.50

CEUX

GENMAB A/S

16-Apr-2025

10:20:25 AM

30

1279.00

CEUX

GENMAB A/S

16-Apr-2025

10:20:25 AM

8

1279.00

CEUX

GENMAB A/S

16-Apr-2025

10:20:26 AM

63

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:26 AM

11

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:26 AM

43

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:26 AM

2

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:26 AM

11

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:26 AM

11

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:26 AM

13

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:26 AM

80

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:20:33 AM

3

1278.50

XCSE

GENMAB A/S

16-Apr-2025

10:21:57 AM

30

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:21:57 AM

87

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:21:58 AM

13

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:21:58 AM

100

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:21:58 AM

21

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:21:58 AM

31

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:21:58 AM

36

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:22:47 AM

87

1279.00

XCSE

GENMAB A/S

16-Apr-2025

10:22:47 AM

51

1279.00

AQEU

GENMAB A/S

16-Apr-2025

10:22:48 AM

32

1279.00

CEUX

GENMAB A/S

16-Apr-2025

10:24:16 AM

14

1281.00

CEUX

GENMAB A/S

16-Apr-2025

10:24:17 AM

36

1281.00

CEUX

GENMAB A/S

16-Apr-2025

10:24:21 AM

32

1281.00

CEUX

GENMAB A/S

16-Apr-2025

10:25:15 AM

91

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:25:15 AM

45

1281.00

XCSE

GENMAB A/S

16-Apr-2025

10:25:15 AM

19

1281.00

XCSE

GENMAB A/S

16-Apr-2025

10:25:15 AM

88

1280.50

CEUX

GENMAB A/S

16-Apr-2025

10:27:30 AM

93

1282.50

XCSE

GENMAB A/S

16-Apr-2025

10:27:31 AM

18

1283.50

CEUX

GENMAB A/S

16-Apr-2025

10:27:32 AM

37

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:27:32 AM

54

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:27:34 AM

35

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:27:34 AM

23

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:27:34 AM

25

1284.50

CEUX

151


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

10:27:35 AM

66

1284.50

CEUX

GENMAB A/S

16-Apr-2025

10:27:35 AM

2

1284.50

CEUX

GENMAB A/S

16-Apr-2025

10:27:39 AM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:27:39 AM

23

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:00 AM

86

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:00 AM

35

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:00 AM

45

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:00 AM

24

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:00 AM

13

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

35

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

45

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

18

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

19

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

91

1288.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

45

1288.50

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

56

1288.50

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

15

1288.50

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

1

1288.50

XCSE

GENMAB A/S

16-Apr-2025

10:28:01 AM

91

1288.00

CEUX

GENMAB A/S

16-Apr-2025

10:28:01 AM

50

1288.00

AQEU

GENMAB A/S

16-Apr-2025

10:28:02 AM

45

1288.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:02 AM

24

1288.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:02 AM

13

1288.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:08 AM

91

1288.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:10 AM

92

1287.50

CEUX

GENMAB A/S

16-Apr-2025

10:28:14 AM

90

1287.50

XCSE

GENMAB A/S

16-Apr-2025

10:28:17 AM

30

1286.50

CEUX

GENMAB A/S

16-Apr-2025

10:28:18 AM

86

1286.50

XCSE

GENMAB A/S

16-Apr-2025

10:28:18 AM

42

1286.50

TQEX

GENMAB A/S

16-Apr-2025

10:28:18 AM

24

1286.50

CEUX

GENMAB A/S

16-Apr-2025

10:28:18 AM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

10:28:54 AM

14

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:55 AM

36

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:28:56 AM

37

1289.00

XCSE

GENMAB A/S

16-Apr-2025

10:29:04 AM

87

1290.50

XCSE

GENMAB A/S

16-Apr-2025

10:29:11 AM

67

1291.50

CEUX

GENMAB A/S

16-Apr-2025

10:29:18 AM

75

1292.00

XCSE

GENMAB A/S

16-Apr-2025

10:29:18 AM

44

1292.00

AQEU

GENMAB A/S

16-Apr-2025

10:29:20 AM

31

1292.00

TQEX

GENMAB A/S

16-Apr-2025

10:29:23 AM

8

1291.00

XCSE

GENMAB A/S

16-Apr-2025

10:29:23 AM

25

1291.00

XCSE

GENMAB A/S

16-Apr-2025

10:29:23 AM

27

1291.00

TQEX

GENMAB A/S

16-Apr-2025

10:29:23 AM

21

1291.50

CEUX

152


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

10:29:23 AM

25

1290.50

CEUX

GENMAB A/S

16-Apr-2025

10:29:23 AM

44

1291.00

AQEU

GENMAB A/S

16-Apr-2025

10:29:24 AM

62

1290.50

CEUX

GENMAB A/S

16-Apr-2025

10:29:30 AM

87

1289.50

XCSE

GENMAB A/S

16-Apr-2025

10:29:30 AM

42

1289.50

CEUX

GENMAB A/S

16-Apr-2025

10:29:30 AM

47

1289.50

CEUX

GENMAB A/S

16-Apr-2025

10:29:53 AM

26

1286.50

XCSE

GENMAB A/S

16-Apr-2025

10:30:20 AM

29

1288.50

XCSE

GENMAB A/S

16-Apr-2025

10:30:55 AM

34

1288.00

CEUX

GENMAB A/S

16-Apr-2025

10:31:06 AM

30

1287.50

XCSE

GENMAB A/S

16-Apr-2025

10:31:06 AM

29

1287.00

CEUX

GENMAB A/S

16-Apr-2025

10:31:25 AM

26

1286.50

XCSE

GENMAB A/S

16-Apr-2025

10:31:25 AM

28

1286.50

TQEX

GENMAB A/S

16-Apr-2025

10:31:28 AM

30

1286.00

CEUX

GENMAB A/S

16-Apr-2025

10:31:29 AM

19

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:31:29 AM

11

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:33:56 AM

28

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:33:56 AM

21

1283.50

CEUX

GENMAB A/S

16-Apr-2025

10:33:59 AM

7

1283.50

CEUX

GENMAB A/S

16-Apr-2025

10:34:23 AM

88

1283.50

XCSE

GENMAB A/S

16-Apr-2025

10:34:40 AM

30

1283.00

TQEX

GENMAB A/S

16-Apr-2025

10:34:40 AM

35

1283.00

AQEU

GENMAB A/S

16-Apr-2025

10:35:34 AM

31

1282.50

XCSE

GENMAB A/S

16-Apr-2025

10:35:34 AM

22

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:35:34 AM

6

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:35:43 AM

26

1281.50

CEUX

GENMAB A/S

16-Apr-2025

10:35:49 AM

3

1281.50

CEUX

GENMAB A/S

16-Apr-2025

10:36:57 AM

32

1281.50

AQEU

GENMAB A/S

16-Apr-2025

10:37:31 AM

1

1281.00

XCSE

GENMAB A/S

16-Apr-2025

10:37:31 AM

56

1281.00

XCSE

GENMAB A/S

16-Apr-2025

10:38:00 AM

52

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:38:27 AM

41

1280.50

XCSE

GENMAB A/S

16-Apr-2025

10:41:18 AM

11

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:42:13 AM

86

1285.00

CEUX

GENMAB A/S

16-Apr-2025

10:42:13 AM

26

1285.00

AQEU

GENMAB A/S

16-Apr-2025

10:44:00 AM

27

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:44:00 AM

91

1285.00

CEUX

GENMAB A/S

16-Apr-2025

10:44:01 AM

12

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:44:01 AM

14

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:44:07 AM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:44:07 AM

17

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:44:07 AM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:45:05 AM

39

1285.00

XCSE

153


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

10:45:05 AM

28

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:45:05 AM

37

1285.00

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

91

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

27

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

35

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

39

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

16

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

74

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

37

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

5

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

1

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:47:40 AM

27

1284.00

TQEX

GENMAB A/S

16-Apr-2025

10:47:40 AM

87

1284.00

CEUX

GENMAB A/S

16-Apr-2025

10:47:40 AM

4

1284.00

CEUX

GENMAB A/S

16-Apr-2025

10:47:40 AM

28

1284.00

AQEU

GENMAB A/S

16-Apr-2025

10:47:56 AM

70

1284.00

XCSE

GENMAB A/S

16-Apr-2025

10:51:09 AM

26

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:09 AM

39

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:09 AM

14

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:12 AM

14

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:12 AM

11

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:15 AM

37

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:15 AM

39

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:25 AM

39

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:25 AM

37

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:46 AM

13

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:46 AM

2

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:51:56 AM

13

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:52:06 AM

39

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:52:06 AM

21

1284.50

XCSE

GENMAB A/S

16-Apr-2025

10:52:28 AM

38

1284.00

TQEX

GENMAB A/S

16-Apr-2025

10:52:28 AM

36

1284.00

CEUX

GENMAB A/S

16-Apr-2025

10:52:28 AM

29

1284.00

AQEU

GENMAB A/S

16-Apr-2025

10:52:39 AM

91

1283.50

XCSE

GENMAB A/S

16-Apr-2025

10:52:39 AM

36

1283.50

CEUX

GENMAB A/S

16-Apr-2025

10:53:51 AM

15

1283.50

CEUX

GENMAB A/S

16-Apr-2025

10:53:51 AM

36

1284.00

CEUX

GENMAB A/S

16-Apr-2025

10:53:53 AM

92

1282.50

XCSE

GENMAB A/S

16-Apr-2025

10:53:53 AM

26

1283.00

TQEX

GENMAB A/S

16-Apr-2025

10:53:53 AM

93

1283.00

CEUX

GENMAB A/S

16-Apr-2025

10:53:53 AM

26

1283.00

AQEU

GENMAB A/S

16-Apr-2025

10:54:25 AM

26

1282.00

TQEX

GENMAB A/S

16-Apr-2025

10:54:25 AM

78

1281.50

CEUX

154


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

10:57:15 AM

9

1281.50

CEUX

GENMAB A/S

16-Apr-2025

10:57:50 AM

89

1283.00

XCSE

GENMAB A/S

16-Apr-2025

10:57:50 AM

39

1283.50

XCSE

GENMAB A/S

16-Apr-2025

10:57:50 AM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

10:57:50 AM

13

1283.50

XCSE

GENMAB A/S

16-Apr-2025

10:57:50 AM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

10:58:08 AM

4

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:59:02 AM

32

1282.50

CEUX

GENMAB A/S

16-Apr-2025

10:59:10 AM

26

1282.50

AQEU

GENMAB A/S

16-Apr-2025

10:59:10 AM

28

1282.50

TQEX

GENMAB A/S

16-Apr-2025

10:59:10 AM

51

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:00:55 AM

13

1282.00

XCSE

GENMAB A/S

16-Apr-2025

11:00:55 AM

13

1282.00

XCSE

GENMAB A/S

16-Apr-2025

11:00:55 AM

2

1281.50

TQEX

GENMAB A/S

16-Apr-2025

11:01:15 AM

89

1281.50

XCSE

GENMAB A/S

16-Apr-2025

11:01:15 AM

29

1281.50

TQEX

GENMAB A/S

16-Apr-2025

11:01:15 AM

88

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:01:21 AM

27

1281.50

AQEU

GENMAB A/S

16-Apr-2025

11:04:05 AM

88

1281.50

XCSE

GENMAB A/S

16-Apr-2025

11:04:05 AM

89

1281.50

CEUX

GENMAB A/S

16-Apr-2025

11:05:01 AM

25

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:05:01 AM

3

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:05:01 AM

12

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:05:30 AM

11

1282.50

XCSE

GENMAB A/S

16-Apr-2025

11:05:30 AM

40

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:05:30 AM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:05:30 AM

27

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:05:35 AM

92

1282.00

CEUX

GENMAB A/S

16-Apr-2025

11:08:05 AM

13

1281.50

TQEX

GENMAB A/S

16-Apr-2025

11:08:05 AM

16

1281.50

TQEX

GENMAB A/S

16-Apr-2025

11:08:05 AM

74

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:11:29 AM

34

1283.50

TQEX

GENMAB A/S

16-Apr-2025

11:11:29 AM

1

1283.50

CEUX

GENMAB A/S

16-Apr-2025

11:11:29 AM

89

1283.50

CEUX

GENMAB A/S

16-Apr-2025

11:11:41 AM

1

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:11:51 AM

12

1283.50

CEUX

GENMAB A/S

16-Apr-2025

11:11:51 AM

14

1283.50

CEUX

GENMAB A/S

16-Apr-2025

11:11:52 AM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:11:53 AM

13

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:11:54 AM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:11:55 AM

12

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:11:56 AM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:13:15 AM

88

1283.00

XCSE

155


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

11:13:15 AM

40

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:13:15 AM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:13:15 AM

38

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:13:15 AM

35

1283.00

AQEU

GENMAB A/S

16-Apr-2025

11:13:15 AM

33

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:13:15 AM

7

1283.00

CEUX

GENMAB A/S

16-Apr-2025

11:13:21 AM

9

1283.00

CEUX

GENMAB A/S

16-Apr-2025

11:13:21 AM

3

1283.00

CEUX

GENMAB A/S

16-Apr-2025

11:13:22 AM

12

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:13:38 AM

15

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:13:38 AM

11

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:16:22 AM

45

1283.50

XCSE

GENMAB A/S

16-Apr-2025

11:16:22 AM

36

1283.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:15 AM

91

1283.00

XCSE

GENMAB A/S

16-Apr-2025

11:17:15 AM

26

1283.00

AQEU

GENMAB A/S

16-Apr-2025

11:17:15 AM

36

1282.50

TQEX

GENMAB A/S

16-Apr-2025

11:17:15 AM

60

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:15 AM

36

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:15 AM

7

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:15 AM

7

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:15 AM

7

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:15 AM

7

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:15 AM

12

1282.50

CEUX

GENMAB A/S

16-Apr-2025

11:17:17 AM

88

1282.00

XCSE

GENMAB A/S

16-Apr-2025

11:17:17 AM

36

1282.00

AQEU

GENMAB A/S

16-Apr-2025

11:19:05 AM

26

1281.50

TQEX

GENMAB A/S

16-Apr-2025

11:19:05 AM

12

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:19:36 AM

88

1281.00

XCSE

GENMAB A/S

16-Apr-2025

11:19:36 AM

26

1281.00

AQEU

GENMAB A/S

16-Apr-2025

11:19:36 AM

15

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:19:36 AM

7

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:19:37 AM

6

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:20:17 AM

9

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:20:17 AM

18

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:20:17 AM

7

1281.00

CEUX

GENMAB A/S

16-Apr-2025

11:20:18 AM

6

1280.50

CEUX

GENMAB A/S

16-Apr-2025

11:20:18 AM

6

1280.50

CEUX

GENMAB A/S

16-Apr-2025

11:20:18 AM

7

1280.50

CEUX

GENMAB A/S

16-Apr-2025

11:21:05 AM

89

1279.50

XCSE

GENMAB A/S

16-Apr-2025

11:21:05 AM

30

1280.00

AQEU

GENMAB A/S

16-Apr-2025

11:21:05 AM

32

1280.00

TQEX

GENMAB A/S

16-Apr-2025

11:21:05 AM

90

1279.50

CEUX

GENMAB A/S

16-Apr-2025

11:23:15 AM

26

1279.00

TQEX

156


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

11:23:55 AM

75

1278.00

CEUX

GENMAB A/S

16-Apr-2025

11:24:11 AM

10

1278.50

CEUX

GENMAB A/S

16-Apr-2025

11:25:43 AM

92

1278.00

XCSE

GENMAB A/S

16-Apr-2025

11:25:43 AM

29

1278.00

TQEX

GENMAB A/S

16-Apr-2025

11:25:43 AM

36

1278.50

CEUX

GENMAB A/S

16-Apr-2025

11:25:43 AM

17

1278.00

CEUX

GENMAB A/S

16-Apr-2025

11:25:44 AM

13

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:25:44 AM

27

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:25:44 AM

12

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:25:45 AM

12

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:26:07 AM

93

1280.00

CEUX

GENMAB A/S

16-Apr-2025

11:29:12 AM

86

1280.00

XCSE

GENMAB A/S

16-Apr-2025

11:30:13 AM

90

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:30:13 AM

35

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:30:13 AM

27

1278.50

AQEU

GENMAB A/S

16-Apr-2025

11:30:13 AM

27

1278.50

TQEX

GENMAB A/S

16-Apr-2025

11:30:13 AM

57

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:30:13 AM

35

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:31:05 AM

62

1278.00

CEUX

GENMAB A/S

16-Apr-2025

11:32:05 AM

91

1278.00

XCSE

GENMAB A/S

16-Apr-2025

11:32:05 AM

25

1278.00

CEUX

GENMAB A/S

16-Apr-2025

11:32:53 AM

93

1278.00

XCSE

GENMAB A/S

16-Apr-2025

11:32:53 AM

27

1278.00

TQEX

GENMAB A/S

16-Apr-2025

11:32:53 AM

91

1278.00

CEUX

GENMAB A/S

16-Apr-2025

11:36:03 AM

26

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:36:03 AM

36

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:37:35 AM

64

1278.50

CEUX

GENMAB A/S

16-Apr-2025

11:39:15 AM

92

1279.50

XCSE

GENMAB A/S

16-Apr-2025

11:39:27 AM

27

1279.50

XCSE

GENMAB A/S

16-Apr-2025

11:41:15 AM

25

1278.50

CEUX

GENMAB A/S

16-Apr-2025

11:41:42 AM

27

1279.00

TQEX

GENMAB A/S

16-Apr-2025

11:42:55 AM

87

1278.50

XCSE

GENMAB A/S

16-Apr-2025

11:42:55 AM

27

1278.00

TQEX

GENMAB A/S

16-Apr-2025

11:42:55 AM

26

1278.50

AQEU

GENMAB A/S

16-Apr-2025

11:42:55 AM

7

1278.50

AQEU

GENMAB A/S

16-Apr-2025

11:43:55 AM

88

1277.50

CEUX

GENMAB A/S

16-Apr-2025

11:46:42 AM

21

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:46:42 AM

39

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:46:52 AM

14

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:46:52 AM

12

1279.00

XCSE

GENMAB A/S

16-Apr-2025

11:47:15 AM

92

1278.50

XCSE

GENMAB A/S

16-Apr-2025

11:48:45 AM

66

1278.00

CEUX

GENMAB A/S

16-Apr-2025

11:49:55 AM

25

1278.00

CEUX

157


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

11:55:00 AM

9

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:55:01 AM

36

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:55:02 AM

36

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:55:06 AM

14

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:56:35 AM

35

1279.00

TQEX

GENMAB A/S

16-Apr-2025

11:56:35 AM

90

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:56:45 AM

12

1279.00

TQEX

GENMAB A/S

16-Apr-2025

11:56:45 AM

36

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:56:53 AM

13

1279.00

CEUX

GENMAB A/S

16-Apr-2025

11:57:56 AM

67

1278.50

XCSE

GENMAB A/S

16-Apr-2025

11:59:25 AM

26

1278.50

XCSE

GENMAB A/S

16-Apr-2025

11:59:25 AM

26

1278.00

TQEX

GENMAB A/S

16-Apr-2025

11:59:25 AM

74

1278.50

AQEU

GENMAB A/S

16-Apr-2025

11:59:25 AM

18

1278.50

CEUX

GENMAB A/S

16-Apr-2025

11:59:25 AM

50

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:00:19 PM

21

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:00:19 PM

2

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:00:19 PM

20

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:02:19 PM

12

1280.00

CEUX

GENMAB A/S

16-Apr-2025

12:04:35 PM

56

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:07:15 PM

86

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:07:15 PM

35

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:10:25 PM

32

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:10:25 PM

16

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:10:25 PM

25

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:10:25 PM

26

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:10:25 PM

14

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:10:29 PM

25

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:10:29 PM

20

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:12:15 PM

13

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:12:15 PM

13

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:12:15 PM

9

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:12:15 PM

12

1279.00

TQEX

GENMAB A/S

16-Apr-2025

12:12:15 PM

25

1279.00

TQEX

GENMAB A/S

16-Apr-2025

12:12:15 PM

89

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:12:26 PM

54

1279.00

AQEU

GENMAB A/S

16-Apr-2025

12:12:26 PM

10

1279.00

CEUX

GENMAB A/S

16-Apr-2025

12:14:57 PM

11

1278.50

XCSE

GENMAB A/S

16-Apr-2025

12:15:09 PM

81

1278.50

XCSE

GENMAB A/S

16-Apr-2025

12:15:09 PM

26

1278.50

XCSE

GENMAB A/S

16-Apr-2025

12:15:09 PM

20

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:15:43 PM

9

1278.50

XCSE

GENMAB A/S

16-Apr-2025

12:15:43 PM

15

1278.50

XCSE

158


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

12:15:43 PM

2

1278.50

XCSE

GENMAB A/S

16-Apr-2025

12:15:43 PM

17

1278.00

TQEX

GENMAB A/S

16-Apr-2025

12:15:43 PM

19

1278.00

TQEX

GENMAB A/S

16-Apr-2025

12:15:43 PM

45

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:15:43 PM

7

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:17:45 PM

92

1277.50

XCSE

GENMAB A/S

16-Apr-2025

12:17:45 PM

2

1277.50

AQEU

GENMAB A/S

16-Apr-2025

12:17:45 PM

57

1277.50

CEUX

GENMAB A/S

16-Apr-2025

12:17:45 PM

2

1277.50

CEUX

GENMAB A/S

16-Apr-2025

12:18:27 PM

29

1277.50

CEUX

GENMAB A/S

16-Apr-2025

12:19:00 PM

86

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:19:00 PM

47

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:19:07 PM

100

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:19:13 PM

90

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:20:22 PM

53

1279.00

TQEX

GENMAB A/S

16-Apr-2025

12:20:22 PM

36

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:20:22 PM

33

1279.00

CEUX

GENMAB A/S

16-Apr-2025

12:20:22 PM

54

1279.00

CEUX

GENMAB A/S

16-Apr-2025

12:20:22 PM

10

1279.00

CEUX

GENMAB A/S

16-Apr-2025

12:22:45 PM

89

1278.50

XCSE

GENMAB A/S

16-Apr-2025

12:22:45 PM

71

1278.50

AQEU

GENMAB A/S

16-Apr-2025

12:22:45 PM

69

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:24:43 PM

19

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:25:45 PM

21

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:27:29 PM

58

1278.00

TQEX

GENMAB A/S

16-Apr-2025

12:27:29 PM

10

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:27:30 PM

15

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:27:32 PM

2

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:27:59 PM

17

1278.00

XCSE

GENMAB A/S

16-Apr-2025

12:27:59 PM

74

1278.00

XCSE

GENMAB A/S

16-Apr-2025

12:29:25 PM

87

1278.00

XCSE

GENMAB A/S

16-Apr-2025

12:29:25 PM

34

1278.00

TQEX

GENMAB A/S

16-Apr-2025

12:29:25 PM

91

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:30:55 PM

14

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:34:25 PM

14

1278.50

XCSE

GENMAB A/S

16-Apr-2025

12:34:25 PM

79

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:35:03 PM

20

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:35:14 PM

15

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

15

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

37

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

13

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

37

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

15

1279.00

XCSE

159


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

12:35:14 PM

14

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

16

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

37

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:35:14 PM

12

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:37:01 PM

13

1278.00

XCSE

GENMAB A/S

16-Apr-2025

12:37:01 PM

80

1278.00

XCSE

GENMAB A/S

16-Apr-2025

12:37:01 PM

31

1278.00

TQEX

GENMAB A/S

16-Apr-2025

12:37:01 PM

26

1277.50

AQEU

GENMAB A/S

16-Apr-2025

12:37:01 PM

8

1278.00

CEUX

GENMAB A/S

16-Apr-2025

12:37:01 PM

68

1277.00

CEUX

GENMAB A/S

16-Apr-2025

12:39:15 PM

89

1277.00

XCSE

GENMAB A/S

16-Apr-2025

12:39:15 PM

10

1277.00

TQEX

GENMAB A/S

16-Apr-2025

12:39:15 PM

10

1277.00

TQEX

GENMAB A/S

16-Apr-2025

12:39:15 PM

7

1277.00

TQEX

GENMAB A/S

16-Apr-2025

12:39:15 PM

25

1277.00

CEUX

GENMAB A/S

16-Apr-2025

12:42:35 PM

35

1277.00

XCSE

GENMAB A/S

16-Apr-2025

12:42:35 PM

65

1276.00

CEUX

GENMAB A/S

16-Apr-2025

12:43:13 PM

24

1276.50

AQEU

GENMAB A/S

16-Apr-2025

12:43:26 PM

3

1276.50

AQEU

GENMAB A/S

16-Apr-2025

12:45:45 PM

87

1276.00

XCSE

GENMAB A/S

16-Apr-2025

12:45:45 PM

22

1276.00

TQEX

GENMAB A/S

16-Apr-2025

12:45:45 PM

26

1276.00

CEUX

GENMAB A/S

16-Apr-2025

12:47:31 PM

93

1276.50

XCSE

GENMAB A/S

16-Apr-2025

12:47:31 PM

24

1276.50

CEUX

GENMAB A/S

16-Apr-2025

12:47:38 PM

2

1277.00

CEUX

GENMAB A/S

16-Apr-2025

12:47:38 PM

66

1276.50

CEUX

GENMAB A/S

16-Apr-2025

12:47:42 PM

36

1277.50

CEUX

GENMAB A/S

16-Apr-2025

12:53:21 PM

9

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:53:21 PM

31

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:53:35 PM

25

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:53:35 PM

19

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:53:56 PM

13

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:54:00 PM

36

1280.00

CEUX

GENMAB A/S

16-Apr-2025

12:54:01 PM

36

1280.00

CEUX

GENMAB A/S

16-Apr-2025

12:54:08 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:54:08 PM

56

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:54:08 PM

34

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:54:08 PM

36

1280.00

CEUX

GENMAB A/S

16-Apr-2025

12:54:47 PM

15

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:54:47 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:54:47 PM

15

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:54:47 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:54:47 PM

13

1280.00

XCSE

160


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

12:55:24 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:55:24 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:55:24 PM

2

1280.00

XCSE

GENMAB A/S

16-Apr-2025

12:55:24 PM

17

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:55:45 PM

63

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:55:45 PM

7

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:57:04 PM

31

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:57:04 PM

36

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:57:04 PM

17

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:57:10 PM

36

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:57:15 PM

2

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:57:36 PM

86

1279.00

XCSE

GENMAB A/S

16-Apr-2025

12:57:36 PM

44

1279.50

XCSE

GENMAB A/S

16-Apr-2025

12:57:36 PM

36

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:57:36 PM

49

1279.50

CEUX

GENMAB A/S

16-Apr-2025

12:58:40 PM

49

1278.50

TQEX

GENMAB A/S

16-Apr-2025

12:58:40 PM

87

1278.50

AQEU

GENMAB A/S

16-Apr-2025

12:58:40 PM

93

1278.50

CEUX

GENMAB A/S

16-Apr-2025

12:58:40 PM

36

1278.50

CEUX

GENMAB A/S

16-Apr-2025

1:01:55 PM

65

1278.50

CEUX

GENMAB A/S

16-Apr-2025

1:01:55 PM

24

1278.50

CEUX

GENMAB A/S

16-Apr-2025

1:03:25 PM

86

1278.50

XCSE

GENMAB A/S

16-Apr-2025

1:03:25 PM

48

1278.50

TQEX

GENMAB A/S

16-Apr-2025

1:03:29 PM

2

1278.50

AQEU

GENMAB A/S

16-Apr-2025

1:03:42 PM

73

1278.50

AQEU

GENMAB A/S

16-Apr-2025

1:04:05 PM

15

1278.50

CEUX

GENMAB A/S

16-Apr-2025

1:06:41 PM

31

1280.50

XCSE

GENMAB A/S

16-Apr-2025

1:06:41 PM

29

1280.50

XCSE

GENMAB A/S

16-Apr-2025

1:08:09 PM

39

1281.50

XCSE

GENMAB A/S

16-Apr-2025

1:08:09 PM

25

1281.50

XCSE

GENMAB A/S

16-Apr-2025

1:08:09 PM

27

1281.50

XCSE

GENMAB A/S

16-Apr-2025

1:10:45 PM

48

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:10:45 PM

43

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:12:20 PM

31

1281.50

XCSE

GENMAB A/S

16-Apr-2025

1:12:20 PM

36

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:12:21 PM

7

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:12:21 PM

51

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:12:21 PM

17

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:12:29 PM

31

1281.50

XCSE

GENMAB A/S

16-Apr-2025

1:12:29 PM

2

1281.50

XCSE

GENMAB A/S

16-Apr-2025

1:13:33 PM

36

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:13:34 PM

31

1281.50

XCSE

GENMAB A/S

16-Apr-2025

1:13:34 PM

50

1281.50

CEUX

161


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

1:13:41 PM

36

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:17:25 PM

39

1282.00

XCSE

GENMAB A/S

16-Apr-2025

1:17:25 PM

28

1282.00

XCSE

GENMAB A/S

16-Apr-2025

1:17:25 PM

15

1282.00

XCSE

GENMAB A/S

16-Apr-2025

1:17:25 PM

69

1281.50

CEUX

GENMAB A/S

16-Apr-2025

1:20:34 PM

92

1282.50

CEUX

GENMAB A/S

16-Apr-2025

1:20:34 PM

15

1282.50

CEUX

GENMAB A/S

16-Apr-2025

1:25:05 PM

90

1282.00

XCSE

GENMAB A/S

16-Apr-2025

1:25:05 PM

39

1282.50

XCSE

GENMAB A/S

16-Apr-2025

1:25:05 PM

29

1282.50

XCSE

GENMAB A/S

16-Apr-2025

1:25:05 PM

29

1282.50

XCSE

GENMAB A/S

16-Apr-2025

1:25:05 PM

20

1282.50

XCSE

GENMAB A/S

16-Apr-2025

1:25:05 PM

69

1282.00

TQEX

GENMAB A/S

16-Apr-2025

1:27:42 PM

50

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:27:42 PM

6

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:27:42 PM

18

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:29:02 PM

2

1283.00

AQEU

GENMAB A/S

16-Apr-2025

1:31:05 PM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:31:05 PM

85

1283.00

AQEU

GENMAB A/S

16-Apr-2025

1:32:21 PM

35

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:32:21 PM

28

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:32:21 PM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:32:21 PM

36

1283.00

CEUX

GENMAB A/S

16-Apr-2025

1:33:00 PM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:33:00 PM

12

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:33:00 PM

36

1283.00

CEUX

GENMAB A/S

16-Apr-2025

1:33:00 PM

77

1282.50

CEUX

GENMAB A/S

16-Apr-2025

1:33:01 PM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:33:05 PM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:33:05 PM

35

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:33:05 PM

39

1283.00

XCSE

GENMAB A/S

16-Apr-2025

1:33:05 PM

9

1282.50

CEUX

GENMAB A/S

16-Apr-2025

1:33:09 PM

14

1282.00

AQEU

GENMAB A/S

16-Apr-2025

1:33:11 PM

99

1282.50

CEUX

GENMAB A/S

16-Apr-2025

1:33:21 PM

68

1282.50

CEUX

GENMAB A/S

16-Apr-2025

1:33:43 PM

39

1283.50

XCSE

GENMAB A/S

16-Apr-2025

1:33:43 PM

16

1283.50

XCSE

GENMAB A/S

16-Apr-2025

1:33:43 PM

16

1283.50

XCSE

GENMAB A/S

16-Apr-2025

1:33:44 PM

36

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:36:06 PM

93

1283.50

XCSE

GENMAB A/S

16-Apr-2025

1:36:06 PM

29

1283.50

XCSE

GENMAB A/S

16-Apr-2025

1:36:06 PM

77

1283.50

TQEX

GENMAB A/S

16-Apr-2025

1:36:06 PM

93

1283.50

CEUX

162


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

1:36:06 PM

36

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:36:12 PM

8

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:38:25 PM

89

1283.50

XCSE

GENMAB A/S

16-Apr-2025

1:38:25 PM

80

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:38:25 PM

10

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:38:25 PM

23

1283.50

CEUX

GENMAB A/S

16-Apr-2025

1:38:26 PM

47

1283.50

XCSE

GENMAB A/S

16-Apr-2025

1:42:55 PM

92

1284.00

XCSE

GENMAB A/S

16-Apr-2025

1:45:12 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:45:17 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:45:35 PM

13

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:45:37 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:45:56 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:46:04 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:46:47 PM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:46:47 PM

37

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:46:47 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:47:00 PM

2

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:47:00 PM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:47:00 PM

37

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:47:45 PM

37

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:47:45 PM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:47:55 PM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:47:55 PM

37

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:47:55 PM

33

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:48:01 PM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:48:01 PM

2

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:48:29 PM

2

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:48:29 PM

17

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:48:34 PM

14

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:48:37 PM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:48:37 PM

37

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:48:37 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:49:00 PM

39

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:49:00 PM

37

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:49:00 PM

41

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:50:00 PM

31

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:50:04 PM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:50:04 PM

42

1285.00

XCSE

GENMAB A/S

16-Apr-2025

1:51:32 PM

88

1285.50

XCSE

GENMAB A/S

16-Apr-2025

1:53:43 PM

71

1285.00

TQEX

GENMAB A/S

16-Apr-2025

1:53:43 PM

90

1285.00

CEUX

GENMAB A/S

16-Apr-2025

1:53:49 PM

15

1285.50

CEUX

163


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

1:53:55 PM

15

1285.50

CEUX

GENMAB A/S

16-Apr-2025

1:53:56 PM

12

1285.50

CEUX

GENMAB A/S

16-Apr-2025

1:54:25 PM

15

1285.50

CEUX

GENMAB A/S

16-Apr-2025

1:55:39 PM

39

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:39 PM

15

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:39 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:39 PM

26

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:40 PM

91

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:40 PM

2

1286.50

AQEU

GENMAB A/S

16-Apr-2025

1:55:40 PM

22

1286.50

AQEU

GENMAB A/S

16-Apr-2025

1:55:40 PM

90

1286.50

CEUX

GENMAB A/S

16-Apr-2025

1:55:45 PM

35

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:45 PM

15

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:45 PM

39

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:45 PM

24

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:45 PM

4

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:45 PM

24

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:45 PM

45

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:55:45 PM

15

1286.50

AQEU

GENMAB A/S

16-Apr-2025

1:55:45 PM

49

1286.50

AQEU

GENMAB A/S

16-Apr-2025

1:55:45 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

1:56:01 PM

26

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:56:01 PM

39

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:56:01 PM

11

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:56:01 PM

26

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:56:01 PM

67

1286.00

TQEX

GENMAB A/S

16-Apr-2025

1:56:01 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

1:56:13 PM

35

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:56:13 PM

26

1286.50

XCSE

GENMAB A/S

16-Apr-2025

1:56:13 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

1:56:13 PM

51

1286.50

CEUX

GENMAB A/S

16-Apr-2025

1:58:35 PM

10

1286.00

TQEX

GENMAB A/S

16-Apr-2025

2:04:25 PM

86

1286.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:03 PM

91

1286.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:03 PM

2

1286.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:03 PM

73

1286.50

TQEX

GENMAB A/S

16-Apr-2025

2:06:03 PM

61

1286.00

TQEX

GENMAB A/S

16-Apr-2025

2:06:03 PM

93

1286.50

AQEU

GENMAB A/S

16-Apr-2025

2:06:03 PM

30

1287.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:03 PM

5

1286.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:04 PM

44

1286.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:04 PM

16

1286.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:05 PM

17

1286.50

CEUX

164


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:06:05 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:06 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:14 PM

15

1286.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

92

1285.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

91

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

92

1283.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

88

1281.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

35

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

13

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

31

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

9

1282.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

35

1281.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

35

1281.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

17

1281.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

14

1281.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

13

1281.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

3

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

2

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

10

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

77

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

87

1279.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

8

1277.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

2

1277.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

79

1277.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:27 PM

48

1286.00

TQEX

GENMAB A/S

16-Apr-2025

2:06:27 PM

20

1285.00

TQEX

GENMAB A/S

16-Apr-2025

2:06:27 PM

75

1284.00

TQEX

GENMAB A/S

16-Apr-2025

2:06:27 PM

90

1285.50

AQEU

GENMAB A/S

16-Apr-2025

2:06:27 PM

89

1284.50

AQEU

GENMAB A/S

16-Apr-2025

2:06:27 PM

86

1283.50

AQEU

GENMAB A/S

16-Apr-2025

2:06:27 PM

28

1284.50

AQEU

GENMAB A/S

16-Apr-2025

2:06:27 PM

93

1285.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

87

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

89

1283.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

36

1285.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

21

1286.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

7

1286.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

50

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

8

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

31

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

93

1283.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

93

1281.50

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

28

1280.00

CEUX

165


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:06:27 PM

27

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

17

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

18

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:27 PM

3

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:28 PM

117

1279.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:29 PM

91

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:30 PM

89

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:30 PM

35

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:30 PM

44

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:30 PM

15

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:30 PM

23

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:30 PM

41

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:30 PM

52

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:31 PM

35

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:32 PM

13

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:32 PM

13

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:32 PM

39

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:32 PM

31

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:32 PM

39

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:32 PM

36

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:06:32 PM

93

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:33 PM

89

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:33 PM

35

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:33 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:33 PM

43

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:33 PM

88

1280.00

CEUX

GENMAB A/S

16-Apr-2025

2:06:47 PM

100

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:06:47 PM

17

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:07:05 PM

15

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:07:05 PM

36

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:07:06 PM

13

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:07:06 PM

37

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:07:29 PM

25

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:07:29 PM

15

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:03 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:04 PM

3

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:04 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:06 PM

2

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:06 PM

39

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:06 PM

14

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:06 PM

14

1280.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:06 PM

93

1279.00

XCSE

GENMAB A/S

16-Apr-2025

2:08:06 PM

11

1279.00

CEUX

166


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:08:06 PM

21

1279.00

CEUX

GENMAB A/S

16-Apr-2025

2:08:57 PM

6

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:08:57 PM

80

1280.50

XCSE

GENMAB A/S

16-Apr-2025

2:10:12 PM

91

1283.50

XCSE

GENMAB A/S

16-Apr-2025

2:11:01 PM

35

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:26 PM

25

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:26 PM

35

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:35 PM

17

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:35 PM

25

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:35 PM

35

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:35 PM

39

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:35 PM

14

1283.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:35 PM

26

1283.00

XCSE

GENMAB A/S

16-Apr-2025

2:11:35 PM

26

1283.00

AQEU

GENMAB A/S

16-Apr-2025

2:11:35 PM

15

1283.50

CEUX

GENMAB A/S

16-Apr-2025

2:11:35 PM

86

1283.00

CEUX

GENMAB A/S

16-Apr-2025

2:12:27 PM

89

1282.50

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

26

1282.50

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

39

1282.50

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

9

1282.50

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

35

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

8

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

62

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

35

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

13

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

7

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

13

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

39

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

15

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:27 PM

89

1282.00

CEUX

GENMAB A/S

16-Apr-2025

2:12:30 PM

35

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:30 PM

39

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:31 PM

35

1281.50

XCSE

GENMAB A/S

16-Apr-2025

2:12:31 PM

35

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:31 PM

39

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:12:31 PM

8

1282.00

XCSE

GENMAB A/S

16-Apr-2025

2:13:04 PM

35

1283.00

XCSE

GENMAB A/S

16-Apr-2025

2:13:10 PM

23

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:13:10 PM

16

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:13:10 PM

14

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:13:10 PM

15

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:13:11 PM

39

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:13:11 PM

19

1284.00

XCSE

167


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:13:11 PM

9

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:15:15 PM

86

1285.00

XCSE

GENMAB A/S

16-Apr-2025

2:17:15 PM

91

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:18:00 PM

3

1285.00

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

91

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

32

1284.00

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

28

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

39

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

18

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

28

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

39

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:18:32 PM

14

1284.50

TQEX

GENMAB A/S

16-Apr-2025

2:18:32 PM

12

1284.50

TQEX

GENMAB A/S

16-Apr-2025

2:18:32 PM

26

1284.00

AQEU

GENMAB A/S

16-Apr-2025

2:18:32 PM

25

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:18:32 PM

36

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:18:32 PM

51

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:18:35 PM

19

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:18:35 PM

35

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:19:31 PM

27

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:19:55 PM

88

1284.50

XCSE

GENMAB A/S

16-Apr-2025

2:19:55 PM

44

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:21:15 PM

48

1284.50

CEUX

GENMAB A/S

16-Apr-2025

2:22:55 PM

90

1285.00

XCSE

GENMAB A/S

16-Apr-2025

2:22:55 PM

39

1285.50

XCSE

GENMAB A/S

16-Apr-2025

2:22:55 PM

30

1285.50

XCSE

GENMAB A/S

16-Apr-2025

2:22:55 PM

18

1285.50

XCSE

GENMAB A/S

16-Apr-2025

2:22:55 PM

30

1285.50

XCSE

GENMAB A/S

16-Apr-2025

2:22:55 PM

33

1285.00

AQEU

GENMAB A/S

16-Apr-2025

2:22:55 PM

93

1285.00

CEUX

GENMAB A/S

16-Apr-2025

2:22:59 PM

8

1285.50

XCSE

GENMAB A/S

16-Apr-2025

2:22:59 PM

1

1285.50

XCSE

GENMAB A/S

16-Apr-2025

2:26:53 PM

40

1287.00

CEUX

GENMAB A/S

16-Apr-2025

2:26:53 PM

18

1287.00

CEUX

GENMAB A/S

16-Apr-2025

2:26:53 PM

18

1287.00

CEUX

GENMAB A/S

16-Apr-2025

2:26:53 PM

12

1287.00

CEUX

GENMAB A/S

16-Apr-2025

2:26:53 PM

45

1286.50

CEUX

GENMAB A/S

16-Apr-2025

2:28:23 PM

23

1287.50

XCSE

GENMAB A/S

16-Apr-2025

2:28:23 PM

21

1287.50

CEUX

GENMAB A/S

16-Apr-2025

2:28:49 PM

6

1288.00

CEUX

GENMAB A/S

16-Apr-2025

2:28:49 PM

3

1288.00

CEUX

GENMAB A/S

16-Apr-2025

2:28:49 PM

12

1288.00

CEUX

GENMAB A/S

16-Apr-2025

2:29:11 PM

8

1288.00

XCSE

168


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:30:08 PM

9

1288.50

CEUX

GENMAB A/S

16-Apr-2025

2:30:08 PM

7

1288.50

CEUX

GENMAB A/S

16-Apr-2025

2:31:09 PM

29

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:31:09 PM

52

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:31:09 PM

38

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:31:09 PM

62

1289.00

TQEX

GENMAB A/S

16-Apr-2025

2:31:09 PM

49

1288.50

AQEU

GENMAB A/S

16-Apr-2025

2:31:09 PM

91

1288.50

CEUX

GENMAB A/S

16-Apr-2025

2:31:09 PM

15

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:32:17 PM

87

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:32:17 PM

13

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:32:17 PM

30

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:32:17 PM

46

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:32:18 PM

27

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:32:18 PM

41

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:32:18 PM

30

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:32:18 PM

14

1289.00

TQEX

GENMAB A/S

16-Apr-2025

2:32:18 PM

34

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:33:12 PM

88

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:12 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:12 PM

44

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:12 PM

41

1290.00

TQEX

GENMAB A/S

16-Apr-2025

2:33:12 PM

39

1290.50

AQEU

GENMAB A/S

16-Apr-2025

2:33:12 PM

90

1290.00

CEUX

GENMAB A/S

16-Apr-2025

2:33:16 PM

87

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

39

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

13

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

39

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

18

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

8

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

39

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

15

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

44

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:33:16 PM

12

1289.00

TQEX

GENMAB A/S

16-Apr-2025

2:33:16 PM

40

1289.50

AQEU

GENMAB A/S

16-Apr-2025

2:33:16 PM

92

1288.50

CEUX

GENMAB A/S

16-Apr-2025

2:35:25 PM

1

1291.50

XCSE

GENMAB A/S

16-Apr-2025

2:35:25 PM

2

1291.50

XCSE

GENMAB A/S

16-Apr-2025

2:37:03 PM

41

1291.50

XCSE

GENMAB A/S

16-Apr-2025

2:37:03 PM

46

1291.50

XCSE

GENMAB A/S

16-Apr-2025

2:37:03 PM

37

1291.50

AQEU

GENMAB A/S

16-Apr-2025

2:37:03 PM

91

1291.50

CEUX

GENMAB A/S

16-Apr-2025

2:38:24 PM

35

1291.50

XCSE

169


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:38:24 PM

39

1291.50

XCSE

GENMAB A/S

16-Apr-2025

2:38:24 PM

27

1291.50

XCSE

GENMAB A/S

16-Apr-2025

2:38:24 PM

16

1291.50

XCSE

GENMAB A/S

16-Apr-2025

2:38:24 PM

35

1291.00

XCSE

GENMAB A/S

16-Apr-2025

2:38:24 PM

15

1291.00

XCSE

GENMAB A/S

16-Apr-2025

2:38:24 PM

36

1291.00

XCSE

GENMAB A/S

16-Apr-2025

2:38:24 PM

86

1290.50

XCSE

GENMAB A/S

16-Apr-2025

2:38:24 PM

26

1290.50

TQEX

GENMAB A/S

16-Apr-2025

2:38:24 PM

38

1290.50

AQEU

GENMAB A/S

16-Apr-2025

2:38:24 PM

34

1291.50

CEUX

GENMAB A/S

16-Apr-2025

2:38:24 PM

90

1290.50

CEUX

GENMAB A/S

16-Apr-2025

2:39:49 PM

27

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:39:49 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:39:49 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:39:49 PM

16

1289.50

TQEX

GENMAB A/S

16-Apr-2025

2:39:49 PM

10

1289.50

TQEX

GENMAB A/S

16-Apr-2025

2:39:49 PM

83

1289.50

CEUX

GENMAB A/S

16-Apr-2025

2:39:49 PM

8

1289.50

CEUX

GENMAB A/S

16-Apr-2025

2:40:12 PM

13

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:12 PM

22

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:12 PM

2

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:15 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:15 PM

17

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:15 PM

35

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:15 PM

26

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:15 PM

13

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:15 PM

13

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:40:15 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:11 PM

18

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:11 PM

35

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:11 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:11 PM

25

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

13

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

13

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

47

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:12 PM

47

1290.00

XCSE

170


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:41:12 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:14 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:14 PM

47

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:14 PM

31

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:14 PM

31

1289.50

CEUX

GENMAB A/S

16-Apr-2025

2:41:14 PM

52

1289.50

CEUX

GENMAB A/S

16-Apr-2025

2:41:17 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:17 PM

47

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:17 PM

31

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:17 PM

10

1289.50

CEUX

GENMAB A/S

16-Apr-2025

2:41:18 PM

47

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:20 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:20 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:41:20 PM

41

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:42:59 PM

12

1290.00

XCSE

GENMAB A/S

16-Apr-2025

2:44:27 PM

10

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:44:27 PM

81

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:44:27 PM

35

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:44:27 PM

14

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:44:27 PM

36

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:44:27 PM

29

1289.50

CEUX

GENMAB A/S

16-Apr-2025

2:44:27 PM

85

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:44:29 PM

93

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:45:25 PM

6

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:46:45 PM

88

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:47:42 PM

39

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:47:42 PM

22

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:47:42 PM

35

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:47:42 PM

2

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:47:42 PM

19

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:47:42 PM

44

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:47:42 PM

48

1289.00

CEUX

GENMAB A/S

16-Apr-2025

2:48:16 PM

39

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:16 PM

12

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:16 PM

45

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:16 PM

21

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:25 PM

39

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:25 PM

45

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:25 PM

33

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:33 PM

49

1289.50

TQEX

GENMAB A/S

16-Apr-2025

2:48:34 PM

35

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:34 PM

15

1289.50

XCSE

GENMAB A/S

16-Apr-2025

2:48:34 PM

45

1289.50

XCSE

171


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

2:48:34 PM

16

1289.50

TQEX

GENMAB A/S

16-Apr-2025

2:48:34 PM

32

1289.50

CEUX

GENMAB A/S

16-Apr-2025

2:48:35 PM

90

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:48:43 PM

35

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:48:43 PM

45

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:49:05 PM

28

1288.50

TQEX

GENMAB A/S

16-Apr-2025

2:49:11 PM

10

1288.50

AQEU

GENMAB A/S

16-Apr-2025

2:49:35 PM

16

1288.50

AQEU

GENMAB A/S

16-Apr-2025

2:49:40 PM

93

1288.00

XCSE

GENMAB A/S

16-Apr-2025

2:49:40 PM

36

1288.50

CEUX

GENMAB A/S

16-Apr-2025

2:49:41 PM

80

1288.00

CEUX

GENMAB A/S

16-Apr-2025

2:49:41 PM

11

1288.00

CEUX

GENMAB A/S

16-Apr-2025

2:49:42 PM

34

1288.00

XCSE

GENMAB A/S

16-Apr-2025

2:49:49 PM

12

1288.50

XCSE

GENMAB A/S

16-Apr-2025

2:49:49 PM

39

1288.50

XCSE

GENMAB A/S

16-Apr-2025

2:49:49 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

2:50:10 PM

18

1288.00

CEUX

GENMAB A/S

16-Apr-2025

2:51:15 PM

87

1288.00

XCSE

GENMAB A/S

16-Apr-2025

2:51:15 PM

71

1288.00

CEUX

GENMAB A/S

16-Apr-2025

2:51:44 PM

16

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:52:05 PM

14

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:53:00 PM

3

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:53:00 PM

30

1289.00

XCSE

GENMAB A/S

16-Apr-2025

2:53:15 PM

93

1288.50

XCSE

GENMAB A/S

16-Apr-2025

2:53:15 PM

20

1288.50

TQEX

GENMAB A/S

16-Apr-2025

2:53:15 PM

86

1288.50

CEUX

GENMAB A/S

16-Apr-2025

2:55:14 PM

1

1290.50

TQEX

GENMAB A/S

16-Apr-2025

2:55:14 PM

36

1290.50

TQEX

GENMAB A/S

16-Apr-2025

2:57:55 PM

78

1290.00

CEUX

GENMAB A/S

16-Apr-2025

2:58:00 PM

48

1290.50

XCSE

GENMAB A/S

16-Apr-2025

2:58:00 PM

2

1290.50

XCSE

GENMAB A/S

16-Apr-2025

2:58:00 PM

17

1290.50

CEUX

GENMAB A/S

16-Apr-2025

2:58:15 PM

7

1290.50

TQEX

GENMAB A/S

16-Apr-2025

2:58:16 PM

31

1290.50

TQEX

GENMAB A/S

16-Apr-2025

2:58:16 PM

11

1291.00

CEUX

GENMAB A/S

16-Apr-2025

2:59:43 PM

90

1291.00

XCSE

GENMAB A/S

16-Apr-2025

2:59:43 PM

23

1291.00

CEUX

GENMAB A/S

16-Apr-2025

2:59:43 PM

70

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:00:35 PM

49

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:00:35 PM

21

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:00:35 PM

2

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:00:35 PM

13

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:01:19 PM

37

1291.50

XCSE

172


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:01:19 PM

39

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:01:20 PM

39

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:01:20 PM

37

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:01:20 PM

39

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:01:20 PM

37

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:01:20 PM

1

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:01:30 PM

87

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:01:30 PM

36

1290.50

CEUX

GENMAB A/S

16-Apr-2025

3:02:34 PM

26

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:02:34 PM

39

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:02:34 PM

21

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:02:34 PM

17

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:02:34 PM

17

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:02:34 PM

44

1289.50

TQEX

GENMAB A/S

16-Apr-2025

3:02:34 PM

42

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:05:25 PM

27

1289.50

TQEX

GENMAB A/S

16-Apr-2025

3:05:25 PM

40

1289.00

CEUX

GENMAB A/S

16-Apr-2025

3:08:22 PM

76

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:08:23 PM

38

1291.00

TQEX

GENMAB A/S

16-Apr-2025

3:08:23 PM

11

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:51 PM

93

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:09:51 PM

28

1291.50

TQEX

GENMAB A/S

16-Apr-2025

3:09:51 PM

74

1291.00

AQEU

GENMAB A/S

16-Apr-2025

3:09:51 PM

87

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:52 PM

63

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:09:52 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:52 PM

7

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:52 PM

8

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:52 PM

7

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:52 PM

16

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:53 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:09:53 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:10:45 PM

92

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:10:45 PM

35

1290.00

TQEX

GENMAB A/S

16-Apr-2025

3:10:45 PM

17

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:10:45 PM

2

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:10:45 PM

68

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:10:58 PM

35

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:10:58 PM

17

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:10:58 PM

1

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:11:25 PM

30

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:11:55 PM

28

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:11:55 PM

48

1289.00

CEUX

173


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:13:55 PM

5

1289.00

CEUX

GENMAB A/S

16-Apr-2025

3:14:58 PM

37

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:15:05 PM

88

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:35 PM

29

1288.50

TQEX

GENMAB A/S

16-Apr-2025

3:15:35 PM

36

1288.50

AQEU

GENMAB A/S

16-Apr-2025

3:15:35 PM

48

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:15:35 PM

38

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:15:38 PM

87

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

26

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

22

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

39

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

13

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

22

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:15:38 PM

29

1287.50

TQEX

GENMAB A/S

16-Apr-2025

3:15:38 PM

93

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:16:39 PM

100

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:16:45 PM

86

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:16:45 PM

86

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:17:05 PM

86

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:17:05 PM

71

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:17:05 PM

19

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:17:11 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:17:52 PM

4

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:18:25 PM

38

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:19:11 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:20:15 PM

36

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:20:15 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:20:18 PM

4

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:20:35 PM

117

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:20:35 PM

17

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:20:35 PM

51

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:20:35 PM

90

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:20:36 PM

26

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:20:36 PM

37

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:20:36 PM

5

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:20:36 PM

2

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:20:36 PM

16

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:20:37 PM

36

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:21:06 PM

37

1288.50

XCSE

174


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:21:06 PM

90

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:21:09 PM

91

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:21:09 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:21:09 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:21:09 PM

28

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:21:12 PM

14

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:21:51 PM

89

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:21:51 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:21:51 PM

25

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:21:51 PM

3

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:22:06 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

16

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

16

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

7

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

14

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

32

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:06 PM

21

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:22:06 PM

8

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:22:06 PM

36

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:22:07 PM

35

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

14

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

37

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

1

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

37

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

16

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

16

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:07 PM

31

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:08 PM

16

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:08 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:08 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:08 PM

47

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:08 PM

89

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:45 PM

17

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:45 PM

12

1287.50

XCSE

175


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:22:45 PM

37

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:45 PM

14

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:45 PM

37

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:22:45 PM

28

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:22:45 PM

16

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:22:45 PM

93

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:22:50 PM

8

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:22:53 PM

19

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:24:40 PM

20

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:24:42 PM

54

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:24:42 PM

19

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:25:13 PM

3

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:25:13 PM

6

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:25:13 PM

6

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:25:13 PM

4

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:25:13 PM

3

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:25:32 PM

39

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:25:32 PM

14

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:25:32 PM

34

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:25:32 PM

81

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:25:32 PM

3

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:26:49 PM

12

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:27:40 PM

36

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:27:50 PM

4

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:27:50 PM

2

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:27:50 PM

2

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:27:50 PM

2

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:27:50 PM

2

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:27:50 PM

2

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:27:58 PM

26

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:28:25 PM

80

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:29:14 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:29:14 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:29:16 PM

37

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:29:16 PM

16

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:29:23 PM

90

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:30:00 PM

88

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:00 PM

3

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:30:00 PM

3

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:30:00 PM

15

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:00 PM

30

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:00 PM

58

1287.50

TQEX

GENMAB A/S

16-Apr-2025

3:30:00 PM

4

1287.00

AQEU

176


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:30:00 PM

30

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:30:00 PM

15

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:30:04 PM

3

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:30:04 PM

2

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:30:04 PM

3

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:30:04 PM

3

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:30:04 PM

20

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:30:09 PM

41

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:30:10 PM

86

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:13 PM

2

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

16

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

25

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

37

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

21

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

2

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

2

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

15

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

10

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

7

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

8

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

2

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

8

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

13

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:30:40 PM

3

1289.00

TQEX

GENMAB A/S

16-Apr-2025

3:30:40 PM

37

1289.00

TQEX

GENMAB A/S

16-Apr-2025

3:30:40 PM

3

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:30:40 PM

3

1289.00

AQEU

GENMAB A/S

16-Apr-2025

3:30:40 PM

2

1289.00

AQEU

GENMAB A/S

16-Apr-2025

3:30:40 PM

2

1289.00

AQEU

GENMAB A/S

16-Apr-2025

3:30:40 PM

24

1289.00

AQEU

GENMAB A/S

16-Apr-2025

3:30:40 PM

15

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:30:40 PM

74

1289.00

CEUX

GENMAB A/S

16-Apr-2025

3:30:40 PM

12

1289.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

88

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

20

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

3

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

3

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

15

1287.50

XCSE

177


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:31:04 PM

37

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

29

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:31:04 PM

35

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:31:04 PM

5

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:31:04 PM

4

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:31:04 PM

21

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:31:04 PM

34

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

4

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

5

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

14

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:04 PM

88

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

12

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

5

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

8

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

22

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

7

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

3

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

7

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

5

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

2

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

5

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

5

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

5

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:04 PM

3

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:05 PM

28

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:31:05 PM

87

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:31:13 PM

22

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:31:45 PM

31

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:31:45 PM

34

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:31:45 PM

14

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:04 PM

34

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:32:04 PM

36

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:05 PM

15

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:05 PM

24

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:05 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:07 PM

21

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:07 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:07 PM

37

1288.50

XCSE

178


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:32:08 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:09 PM

14

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:09 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:09 PM

38

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

16

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

38

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

16

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

16

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

15

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

15

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:11 PM

38

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

30

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

1

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

30

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

31

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

15

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

50

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

15

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

5

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

15

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

17

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:12 PM

2

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:32:12 PM

2

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:32:12 PM

8

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:32:12 PM

2

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:32:12 PM

37

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:12 PM

3

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:12 PM

12

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:13 PM

17

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:13 PM

9

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:13 PM

11

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:13 PM

14

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:25 PM

37

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:32 PM

4

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:32 PM

2

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:32 PM

2

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:32 PM

7

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:32 PM

2

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:32 PM

15

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:32:33 PM

2

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:32:43 PM

93

1287.00

XCSE

179


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:32:43 PM

15

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:32:55 PM

74

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:01 PM

2

1288.50

TQEX

GENMAB A/S

16-Apr-2025

3:33:01 PM

4

1288.50

TQEX

GENMAB A/S

16-Apr-2025

3:33:01 PM

5

1288.50

TQEX

GENMAB A/S

16-Apr-2025

3:33:01 PM

85

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:01 PM

5

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:03 PM

35

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:03 PM

19

1288.50

TQEX

GENMAB A/S

16-Apr-2025

3:33:35 PM

67

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

24

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

5

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

15

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

15

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

19

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

13

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

5

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

17

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:35 PM

26

1289.50

TQEX

GENMAB A/S

16-Apr-2025

3:33:35 PM

3

1289.00

AQEU

GENMAB A/S

16-Apr-2025

3:33:35 PM

31

1289.00

AQEU

GENMAB A/S

16-Apr-2025

3:33:35 PM

89

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:35 PM

3

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:35 PM

7

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:35 PM

3

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:35 PM

2

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:36 PM

29

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:37 PM

90

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:37 PM

29

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:37 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:37 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:37 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:37 PM

32

1289.50

TQEX

GENMAB A/S

16-Apr-2025

3:33:37 PM

31

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:33:37 PM

17

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:37 PM

6

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:37 PM

69

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:37 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:33:38 PM

23

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:38 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:38 PM

17

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:38 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

37

1290.00

XCSE

180


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:33:39 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

1

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:39 PM

13

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

17

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

17

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

31

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:40 PM

35

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:43 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:43 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:43 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:45 PM

35

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:45 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:45 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:45 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:45 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:45 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:45 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

28

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

15

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:46 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:48 PM

4

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:48 PM

15

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:48 PM

5

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:48 PM

20

1289.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:50 PM

3

1288.50

CEUX

181


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:33:50 PM

8

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:51 PM

41

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

51

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

14

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

5

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

22

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

7

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

8

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

15

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:33:51 PM

8

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:33:51 PM

18

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:33:51 PM

80

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:51 PM

15

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:51 PM

11

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:51 PM

17

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:51 PM

4

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:33:51 PM

40

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:34:26 PM

5

1291.00

AQEU

GENMAB A/S

16-Apr-2025

3:34:26 PM

5

1291.00

AQEU

GENMAB A/S

16-Apr-2025

3:34:26 PM

15

1291.00

AQEU

GENMAB A/S

16-Apr-2025

3:34:26 PM

42

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:26 PM

5

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:26 PM

15

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:26 PM

13

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:26 PM

5

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:26 PM

7

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:27 PM

7

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:34:27 PM

15

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:34:27 PM

4

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:34:27 PM

4

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:34:27 PM

50

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:27 PM

3

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:32 PM

17

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:34:32 PM

16

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:34:34 PM

89

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:34:34 PM

22

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:34:41 PM

36

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:45 PM

36

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:56 PM

76

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:34:56 PM

8

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:34:56 PM

4

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:34:56 PM

6

1291.00

CEUX

182


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:34:56 PM

3

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:56 PM

71

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:56 PM

3

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:34:56 PM

6

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:35:00 PM

3

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:35:39 PM

93

1292.00

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

19

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

25

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

6

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

5

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

22

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

15

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

15

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

10

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:35:39 PM

15

1291.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

2

1291.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

14

1291.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

5

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

5

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

11

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

4

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

1

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:35:39 PM

39

1292.00

AQEU

GENMAB A/S

16-Apr-2025

3:35:39 PM

36

1292.50

CEUX

GENMAB A/S

16-Apr-2025

3:35:39 PM

51

1292.00

CEUX

GENMAB A/S

16-Apr-2025

3:35:39 PM

42

1292.00

CEUX

GENMAB A/S

16-Apr-2025

3:35:39 PM

71

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:35:39 PM

20

1291.00

CEUX

GENMAB A/S

16-Apr-2025

3:36:28 PM

69

1293.00

CEUX

GENMAB A/S

16-Apr-2025

3:36:32 PM

20

1293.00

CEUX

GENMAB A/S

16-Apr-2025

3:36:34 PM

7

1292.50

AQEU

GENMAB A/S

16-Apr-2025

3:36:34 PM

6

1292.50

AQEU

GENMAB A/S

16-Apr-2025

3:36:36 PM

87

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

17

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

14

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

25

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

3

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

12

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

5

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

11

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

9

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

4

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

13

1292.50

XCSE

183


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:36:36 PM

4

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:36 PM

30

1292.50

TQEX

GENMAB A/S

16-Apr-2025

3:36:37 PM

32

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

33

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:37 PM

27

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

90

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

10

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

15

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

15

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

26

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

80

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:53 PM

82

1292.00

CEUX

GENMAB A/S

16-Apr-2025

3:36:54 PM

54

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:56 PM

1

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:36:58 PM

92

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:37:05 PM

3

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:37:05 PM

2

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:37:05 PM

7

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:37:05 PM

6

1292.00

CEUX

GENMAB A/S

16-Apr-2025

3:37:12 PM

87

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:37:12 PM

26

1293.00

AQEU

GENMAB A/S

16-Apr-2025

3:37:12 PM

90

1293.00

CEUX

GENMAB A/S

16-Apr-2025

3:37:27 PM

19

1292.00

CEUX

GENMAB A/S

16-Apr-2025

3:37:27 PM

70

1292.00

CEUX

GENMAB A/S

16-Apr-2025

3:38:12 PM

6

1294.00

CEUX

GENMAB A/S

16-Apr-2025

3:38:12 PM

3

1294.00

CEUX

GENMAB A/S

16-Apr-2025

3:38:12 PM

3

1294.00

CEUX

GENMAB A/S

16-Apr-2025

3:38:12 PM

5

1294.00

CEUX

GENMAB A/S

16-Apr-2025

3:38:14 PM

17

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:38:14 PM

3

1294.00

XCSE

GENMAB A/S

16-Apr-2025

3:38:14 PM

12

1294.00

XCSE

GENMAB A/S

16-Apr-2025

3:38:14 PM

2

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:38:14 PM

2

1293.50

XCSE

184


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:38:14 PM

2

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:38:14 PM

5

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:38:14 PM

27

1294.00

AQEU

GENMAB A/S

16-Apr-2025

3:38:14 PM

73

1294.00

CEUX

GENMAB A/S

16-Apr-2025

3:38:29 PM

89

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:38:29 PM

35

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:38:29 PM

90

1293.50

CEUX

GENMAB A/S

16-Apr-2025

3:38:30 PM

26

1293.50

AQEU

GENMAB A/S

16-Apr-2025

3:39:01 PM

86

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:39:01 PM

46

1293.50

CEUX

GENMAB A/S

16-Apr-2025

3:39:01 PM

42

1293.50

CEUX

GENMAB A/S

16-Apr-2025

3:39:02 PM

37

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:39:02 PM

19

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:39:02 PM

14

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:39:02 PM

17

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:39:02 PM

30

1293.50

XCSE

GENMAB A/S

16-Apr-2025

3:39:02 PM

14

1293.00

TQEX

GENMAB A/S

16-Apr-2025

3:39:02 PM

12

1293.00

TQEX

GENMAB A/S

16-Apr-2025

3:39:07 PM

89

1292.50

XCSE

GENMAB A/S

16-Apr-2025

3:39:07 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:07 PM

20

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:07 PM

15

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:07 PM

15

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:07 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:07 PM

86

1292.50

CEUX

GENMAB A/S

16-Apr-2025

3:39:08 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:08 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:08 PM

5

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:08 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:19 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:19 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:19 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:19 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:19 PM

32

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

15

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

71

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

59

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:20 PM

5

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

9

1293.00

XCSE

185


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:39:21 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

35

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

15

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:21 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:23 PM

15

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:23 PM

30

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:23 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:23 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:23 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:23 PM

16

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:23 PM

8

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:24 PM

14

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:24 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:24 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:24 PM

29

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:25 PM

17

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:25 PM

37

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:25 PM

11

1293.00

XCSE

GENMAB A/S

16-Apr-2025

3:39:25 PM

31

1292.00

TQEX

GENMAB A/S

16-Apr-2025

3:40:03 PM

88

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:03 PM

1

1291.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:15 PM

92

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:15 PM

10

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:15 PM

13

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:15 PM

17

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:15 PM

15

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:15 PM

15

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:15 PM

2

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:40:15 PM

3

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:40:15 PM

7

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:40:15 PM

8

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:40:15 PM

2

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:40:15 PM

3

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:40:15 PM

2

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:40:15 PM

28

1291.00

AQEU

GENMAB A/S

16-Apr-2025

3:40:15 PM

88

1291.00

CEUX

186


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:40:16 PM

86

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:22 PM

3

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:23 PM

26

1290.00

AQEU

GENMAB A/S

16-Apr-2025

3:40:23 PM

1

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:40:23 PM

87

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:40:55 PM

87

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

37

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

3

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

6

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

3

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

2

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

5

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

2

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

2

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

5

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

10

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

12

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

30

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:55 PM

26

1289.00

TQEX

GENMAB A/S

16-Apr-2025

3:40:55 PM

53

1289.00

CEUX

GENMAB A/S

16-Apr-2025

3:40:55 PM

32

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:40:55 PM

34

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:40:55 PM

20

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:40:57 PM

117

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:40:57 PM

28

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:41:02 PM

2

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:41:06 PM

4

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:41:06 PM

37

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:41:17 PM

2

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:42:08 PM

89

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:42:08 PM

50

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:42:08 PM

37

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:42:08 PM

32

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:42:08 PM

26

1290.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:01 PM

37

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:01 PM

2

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:43:01 PM

37

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:01 PM

26

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:01 PM

70

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:02 PM

45

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:02 PM

37

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:02 PM

16

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:02 PM

16

1291.00

XCSE

187


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:43:02 PM

45

1291.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:02 PM

31

1290.50

TQEX

GENMAB A/S

16-Apr-2025

3:43:02 PM

3

1290.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:15 PM

87

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

37

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

5

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

2

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

14

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

8

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

2

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

4

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

2

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

2

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

7

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:15 PM

6

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:15 PM

7

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:15 PM

3

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:15 PM

2

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:15 PM

2

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:15 PM

2

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:15 PM

11

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:16 PM

3

1289.50

AQEU

GENMAB A/S

16-Apr-2025

3:43:29 PM

4

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:29 PM

2

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:29 PM

25

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:29 PM

5

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:29 PM

2

1289.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:29 PM

21

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:43:29 PM

8

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:43:29 PM

37

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:43:38 PM

60

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:38 PM

28

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:43:38 PM

2

1290.00

TQEX

GENMAB A/S

16-Apr-2025

3:43:38 PM

3

1290.00

TQEX

GENMAB A/S

16-Apr-2025

3:43:38 PM

2

1290.00

TQEX

GENMAB A/S

16-Apr-2025

3:43:38 PM

8

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:38 PM

16

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:38 PM

10

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:38 PM

4

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:38 PM

5

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:38 PM

25

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:38 PM

11

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:38 PM

4

1290.00

CEUX

188


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:43:38 PM

7

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:43:50 PM

88

1290.50

XCSE

GENMAB A/S

16-Apr-2025

3:44:01 PM

60

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:44:01 PM

16

1290.00

XCSE

GENMAB A/S

16-Apr-2025

3:44:01 PM

3

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:44:01 PM

15

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:44:01 PM

15

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:44:01 PM

53

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:44:01 PM

88

1290.00

CEUX

GENMAB A/S

16-Apr-2025

3:44:35 PM

5

1289.50

XCSE

GENMAB A/S

16-Apr-2025

3:45:01 PM

26

1288.50

CEUX

GENMAB A/S

16-Apr-2025

3:45:11 PM

89

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:45:13 PM

20

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:45:17 PM

6

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:45:17 PM

3

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:45:17 PM

2

1288.50

XCSE

GENMAB A/S

16-Apr-2025

3:45:17 PM

5

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:17 PM

2

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:17 PM

4

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:18 PM

3

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:22 PM

10

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:23 PM

5

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:23 PM

2

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:28 PM

4

1288.00

TQEX

GENMAB A/S

16-Apr-2025

3:45:29 PM

3

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:45:29 PM

16

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:45:29 PM

3

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:45:33 PM

2

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:45:33 PM

4

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

8

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

3

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

4

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

2

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

10

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

5

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

5

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

7

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:45:33 PM

13

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:46:15 PM

89

1288.00

XCSE

GENMAB A/S

16-Apr-2025

3:46:15 PM

32

1288.00

AQEU

GENMAB A/S

16-Apr-2025

3:46:15 PM

8

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:46:15 PM

7

1288.00

CEUX

189


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:46:15 PM

6

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:46:15 PM

2

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:46:15 PM

4

1288.00

CEUX

GENMAB A/S

16-Apr-2025

3:46:49 PM

5

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:46:49 PM

4

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:46:49 PM

4

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:46:49 PM

68

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:46:49 PM

21

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:46:49 PM

2

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:46:49 PM

7

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:46:59 PM

87

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:46:59 PM

70

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:46:59 PM

37

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:46:59 PM

10

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:46:59 PM

30

1287.00

TQEX

GENMAB A/S

16-Apr-2025

3:46:59 PM

26

1287.00

AQEU

GENMAB A/S

16-Apr-2025

3:46:59 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:47:00 PM

37

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:47:00 PM

19

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:47:00 PM

100

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:47:00 PM

11

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:47:08 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:08 PM

5

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:08 PM

7

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:47:08 PM

8

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:47:08 PM

86

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:47:22 PM

26

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:22 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:25 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:25 PM

15

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:25 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:25 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:25 PM

80

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:47:25 PM

9

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:47:26 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:26 PM

14

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:26 PM

28

1286.50

AQEU

GENMAB A/S

16-Apr-2025

3:47:28 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:29 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:29 PM

2

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:29 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:30 PM

2

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:34 PM

15

1287.00

XCSE

190


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:47:35 PM

15

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

14

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

14

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

15

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

14

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

49

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

15

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

49

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:35 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:42 PM

100

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:48 PM

72

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:47:48 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:48:00 PM

23

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:48:25 PM

65

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:48:55 PM

2

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:49:50 PM

1

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:49:50 PM

88

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:49:50 PM

2

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:49:50 PM

3

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:49:50 PM

28

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:49:50 PM

4

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:49:50 PM

20

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:49:50 PM

2

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:49:50 PM

3

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:49:50 PM

9

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:49:50 PM

7

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:49:50 PM

4

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:50:07 PM

63

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:07 PM

54

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:07 PM

46

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:07 PM

6

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:07 PM

3

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:08 PM

8

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:08 PM

4

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:08 PM

7

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:08 PM

10

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:08 PM

4

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:08 PM

16

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:50:08 PM

2

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:50:08 PM

8

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:50:08 PM

4

1286.00

CEUX

191


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:50:08 PM

3

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:50:08 PM

4

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:50:08 PM

6

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:50:08 PM

3

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:50:32 PM

13

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:50:32 PM

3

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:50:32 PM

22

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:50:47 PM

89

1287.50

XCSE

GENMAB A/S

16-Apr-2025

3:50:47 PM

19

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:50:50 PM

88

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:50:50 PM

4

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:50:50 PM

15

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:50:50 PM

7

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:50:50 PM

15

1287.50

AQEU

GENMAB A/S

16-Apr-2025

3:50:50 PM

16

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:50:50 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

3:50:50 PM

4

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:50:50 PM

6

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:50:50 PM

63

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:51:03 PM

93

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:51:09 PM

7

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:51:09 PM

3

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:51:09 PM

4

1286.50

AQEU

GENMAB A/S

16-Apr-2025

3:51:09 PM

9

1286.50

AQEU

GENMAB A/S

16-Apr-2025

3:51:09 PM

4

1286.50

AQEU

GENMAB A/S

16-Apr-2025

3:51:09 PM

92

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:51:09 PM

4

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:51:09 PM

2

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:51:33 PM

2

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:51:35 PM

21

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:51:35 PM

17

1286.50

AQEU

GENMAB A/S

16-Apr-2025

3:51:39 PM

4

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:51:45 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:51:45 PM

93

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:52:51 PM

5

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:52:51 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:52:51 PM

15

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:52:51 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:52:51 PM

4

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:52:51 PM

7

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:52:51 PM

2

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:52:51 PM

2

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:52:51 PM

3

1286.00

CEUX

192


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:52:51 PM

6

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:52:51 PM

69

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:53:01 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:01 PM

20

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:01 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:02 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:02 PM

11

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:02 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:02 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:53:02 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:53:03 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:03 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:53:04 PM

40

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:04 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:04 PM

40

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:04 PM

32

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:53:07 PM

95

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:53:07 PM

22

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:53:10 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:53:25 PM

20

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:25 PM

72

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:53:25 PM

27

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:53:25 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:53:25 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

3:53:25 PM

55

1286.50

TQEX

GENMAB A/S

16-Apr-2025

3:53:25 PM

59

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:53:25 PM

29

1286.50

CEUX

GENMAB A/S

16-Apr-2025

3:54:10 PM

60

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:54:10 PM

28

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:10 PM

29

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:10 PM

31

1286.50

AQEU

GENMAB A/S

16-Apr-2025

3:54:10 PM

36

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:54:10 PM

1

1287.00

CEUX

GENMAB A/S

16-Apr-2025

3:54:10 PM

14

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:54:10 PM

75

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:54:11 PM

17

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:11 PM

13

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:11 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:11 PM

42

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:11 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:11 PM

16

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:11 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:11 PM

18

1286.50

XCSE

193


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:54:12 PM

10

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

15

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

19

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

9

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

17

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

37

1286.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

4

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:12 PM

87

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:54:13 PM

14

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:54:13 PM

7

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:54:35 PM

50

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:00 PM

87

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

46

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

5

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

46

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

10

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

5

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

5

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

1

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

2

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

25

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:00 PM

4

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

15

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

10

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

4

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

3

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

5

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

13

1286.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

3

1285.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

24

1285.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:00 PM

7

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:55:00 PM

7

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:55:00 PM

2

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:55:00 PM

14

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:55:00 PM

5

1284.50

AQEU

GENMAB A/S

16-Apr-2025

3:55:00 PM

6

1284.50

AQEU

GENMAB A/S

16-Apr-2025

3:55:00 PM

21

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:00 PM

69

1286.00

CEUX

194


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:55:00 PM

4

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:00 PM

32

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:03 PM

33

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:03 PM

52

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:03 PM

1

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:03 PM

5

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:07 PM

46

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:07 PM

6

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:07 PM

3

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:07 PM

16

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:07 PM

16

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:07 PM

30

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:07 PM

26

1285.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:07 PM

24

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:07 PM

5

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:07 PM

15

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:07 PM

5

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:07 PM

37

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

47

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:23 PM

12

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:23 PM

4

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:23 PM

6

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:23 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:23 PM

4

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:23 PM

7

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:23 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:23 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:55:23 PM

19

1284.50

AQEU

GENMAB A/S

16-Apr-2025

3:55:23 PM

3

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

10

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

3

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

3

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

4

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

6

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

5

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:23 PM

3

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:55:24 PM

91

1284.00

XCSE

GENMAB A/S

16-Apr-2025

3:55:24 PM

26

1284.00

AQEU

GENMAB A/S

16-Apr-2025

3:55:25 PM

14

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:55:33 PM

9

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:56:25 PM

46

1284.50

XCSE

GENMAB A/S

16-Apr-2025

3:56:25 PM

46

1283.50

CEUX

GENMAB A/S

16-Apr-2025

3:56:41 PM

15

1285.00

XCSE

195


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:57:00 PM

87

1285.00

XCSE

GENMAB A/S

16-Apr-2025

3:57:25 PM

36

1286.00

CEUX

GENMAB A/S

16-Apr-2025

3:57:27 PM

14

1286.00

XCSE

GENMAB A/S

16-Apr-2025

3:57:54 PM

90

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:57:54 PM

53

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:54 PM

5

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:55 PM

2

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:57:55 PM

8

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:57:55 PM

2

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:57:55 PM

2

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:57:55 PM

3

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:57:55 PM

4

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:57:55 PM

12

1285.50

AQEU

GENMAB A/S

16-Apr-2025

3:57:55 PM

7

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:55 PM

6

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:55 PM

2

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:55 PM

2

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:55 PM

2

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:55 PM

10

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:57:55 PM

6

1285.50

CEUX

GENMAB A/S

16-Apr-2025

3:58:05 PM

92

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:21 PM

39

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:21 PM

35

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:21 PM

37

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:21 PM

37

1285.00

TQEX

GENMAB A/S

16-Apr-2025

3:58:34 PM

22

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:34 PM

37

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:34 PM

16

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:34 PM

14

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:34 PM

14

1285.50

XCSE

GENMAB A/S

16-Apr-2025

3:58:34 PM

87

1284.50

CEUX

GENMAB A/S

16-Apr-2025

3:58:55 PM

22

1285.00

XCSE

GENMAB A/S

16-Apr-2025

3:58:55 PM

66

1285.00

XCSE

GENMAB A/S

16-Apr-2025

3:58:55 PM

35

1285.00

TQEX

GENMAB A/S

16-Apr-2025

3:58:55 PM

35

1285.00

AQEU

GENMAB A/S

16-Apr-2025

3:58:55 PM

87

1285.00

CEUX

GENMAB A/S

16-Apr-2025

3:59:35 PM

15

1284.00

XCSE

GENMAB A/S

16-Apr-2025

3:59:35 PM

74

1284.00

XCSE

GENMAB A/S

16-Apr-2025

3:59:35 PM

88

1283.00

XCSE

GENMAB A/S

16-Apr-2025

3:59:35 PM

4

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:59:35 PM

23

1284.00

TQEX

GENMAB A/S

16-Apr-2025

3:59:35 PM

28

1284.00

AQEU

GENMAB A/S

16-Apr-2025

3:59:35 PM

3

1283.50

CEUX

196


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

3:59:35 PM

1

1282.50

CEUX

GENMAB A/S

16-Apr-2025

3:59:48 PM

18

1282.50

XCSE

GENMAB A/S

16-Apr-2025

3:59:48 PM

46

1282.50

TQEX

GENMAB A/S

16-Apr-2025

3:59:48 PM

90

1282.50

CEUX

GENMAB A/S

16-Apr-2025

3:59:48 PM

12

1282.50

CEUX

GENMAB A/S

16-Apr-2025

3:59:48 PM

3

1282.50

CEUX

GENMAB A/S

16-Apr-2025

3:59:58 PM

16

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:20 PM

26

1282.00

AQEU

GENMAB A/S

16-Apr-2025

4:00:26 PM

100

1282.00

XCSE

GENMAB A/S

16-Apr-2025

4:00:26 PM

45

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:26 PM

71

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:26 PM

1

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:27 PM

25

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:27 PM

30

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:27 PM

7

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:27 PM

4

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:27 PM

51

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:27 PM

88

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:34 PM

17

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:35 PM

18

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:00:36 PM

71

1281.50

CEUX

GENMAB A/S

16-Apr-2025

4:01:05 PM

7

1281.50

CEUX

GENMAB A/S

16-Apr-2025

4:01:19 PM

86

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:19 PM

9

1281.50

CEUX

GENMAB A/S

16-Apr-2025

4:01:27 PM

5

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

88

1280.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

37

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

66

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

22

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

16

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

17

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

14

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

32

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:35 PM

16

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:36 PM

32

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:36 PM

14

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:36 PM

14

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:36 PM

17

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:36 PM

37

1281.50

XCSE

GENMAB A/S

16-Apr-2025

4:01:45 PM

88

1280.00

CEUX

GENMAB A/S

16-Apr-2025

4:02:00 PM

88

1279.50

XCSE

GENMAB A/S

16-Apr-2025

4:02:00 PM

36

1280.00

CEUX

GENMAB A/S

16-Apr-2025

4:02:00 PM

50

1280.00

CEUX

197


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:02:01 PM

15

1279.50

AQEU

GENMAB A/S

16-Apr-2025

4:02:02 PM

39

1279.00

TQEX

GENMAB A/S

16-Apr-2025

4:02:02 PM

1

1279.00

TQEX

GENMAB A/S

16-Apr-2025

4:02:02 PM

16

1279.50

AQEU

GENMAB A/S

16-Apr-2025

4:02:02 PM

36

1279.50

CEUX

GENMAB A/S

16-Apr-2025

4:02:20 PM

7

1279.50

CEUX

GENMAB A/S

16-Apr-2025

4:02:35 PM

34

1280.00

CEUX

GENMAB A/S

16-Apr-2025

4:02:35 PM

59

1280.00

CEUX

GENMAB A/S

16-Apr-2025

4:02:43 PM

46

1280.50

XCSE

GENMAB A/S

16-Apr-2025

4:03:35 PM

89

1280.50

XCSE

GENMAB A/S

16-Apr-2025

4:03:35 PM

1

1280.00

CEUX

GENMAB A/S

16-Apr-2025

4:03:42 PM

3

1280.50

XCSE

GENMAB A/S

16-Apr-2025

4:03:43 PM

19

1281.00

CEUX

GENMAB A/S

16-Apr-2025

4:03:43 PM

24

1281.00

CEUX

GENMAB A/S

16-Apr-2025

4:03:53 PM

38

1282.00

CEUX

GENMAB A/S

16-Apr-2025

4:03:53 PM

2

1282.00

CEUX

GENMAB A/S

16-Apr-2025

4:03:54 PM

12

1282.00

TQEX

GENMAB A/S

16-Apr-2025

4:03:54 PM

25

1282.00

CEUX

GENMAB A/S

16-Apr-2025

4:03:54 PM

68

1282.00

CEUX

GENMAB A/S

16-Apr-2025

4:03:59 PM

24

1282.00

TQEX

GENMAB A/S

16-Apr-2025

4:04:06 PM

15

1282.50

CEUX

GENMAB A/S

16-Apr-2025

4:05:05 PM

46

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:05:05 PM

13

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:05:05 PM

8

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:05:05 PM

26

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:05:14 PM

87

1282.50

XCSE

GENMAB A/S

16-Apr-2025

4:05:14 PM

58

1282.50

CEUX

GENMAB A/S

16-Apr-2025

4:05:17 PM

35

1282.50

CEUX

GENMAB A/S

16-Apr-2025

4:06:35 PM

86

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:06:35 PM

40

1284.00

AQEU

GENMAB A/S

16-Apr-2025

4:06:35 PM

27

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:06:35 PM

1

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:07:16 PM

16

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:07:16 PM

2

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:07:19 PM

10

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:07:19 PM

4

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:07:35 PM

91

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:07:35 PM

55

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:35 PM

46

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:35 PM

15

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:35 PM

1

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:35 PM

25

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:35 PM

15

1285.00

XCSE

198


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:07:35 PM

5

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:35 PM

91

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:07:39 PM

46

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:39 PM

24

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:44 PM

46

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:44 PM

3

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:44 PM

30

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:07:50 PM

46

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:07:52 PM

4

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:08:05 PM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:05 PM

46

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:05 PM

6

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:08:05 PM

21

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:08:05 PM

4

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:08:05 PM

9

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:08:05 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:08:09 PM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:09 PM

46

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:09 PM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:09 PM

46

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:09 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:08:09 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:08:10 PM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:10 PM

35

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:10 PM

47

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:10 PM

15

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:10 PM

16

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:10 PM

4

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:10 PM

3

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:08:55 PM

90

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:55 PM

29

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:08:58 PM

100

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:58 PM

14

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:08:58 PM

16

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:08:58 PM

101

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:09:19 PM

37

1284.50

TQEX

GENMAB A/S

16-Apr-2025

4:09:19 PM

84

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:09:19 PM

7

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:10:01 PM

92

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:10:01 PM

34

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:10:01 PM

16

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:10:01 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:10:01 PM

50

1285.00

CEUX

199


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:10:06 PM

21

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:10:42 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:10:42 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:10:42 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:10:42 PM

16

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:10:42 PM

4

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:10:42 PM

20

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:10:42 PM

8

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:10:43 PM

37

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:10:53 PM

2

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:10:53 PM

2

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:10:53 PM

85

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:10:54 PM

22

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:10:59 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:16 PM

34

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:11:16 PM

22

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:11:16 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:17 PM

18

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:11:27 PM

6

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:11:27 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:27 PM

51

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:33 PM

12

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:11:33 PM

10

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:11:33 PM

46

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:11:33 PM

91

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:11:33 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:11:33 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:11:33 PM

10

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:11:33 PM

3

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:11:33 PM

11

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:11:33 PM

9

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:11:33 PM

7

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:11:33 PM

3

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:11:33 PM

4

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:33 PM

3

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:33 PM

5

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:33 PM

38

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:11:48 PM

15

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:11:51 PM

12

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:11:51 PM

12

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:13:06 PM

2

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:11 PM

39

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:11 PM

20

1284.00

XCSE

200


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:13:11 PM

7

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:19 PM

46

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:19 PM

4

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:19 PM

5

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:19 PM

15

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:19 PM

15

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:19 PM

32

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:19 PM

10

1283.00

TQEX

GENMAB A/S

16-Apr-2025

4:13:19 PM

11

1283.50

AQEU

GENMAB A/S

16-Apr-2025

4:13:19 PM

25

1283.50

AQEU

GENMAB A/S

16-Apr-2025

4:13:19 PM

1

1283.50

AQEU

GENMAB A/S

16-Apr-2025

4:13:19 PM

93

1283.00

CEUX

GENMAB A/S

16-Apr-2025

4:13:20 PM

34

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

16

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

46

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

18

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

3

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

17

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

22

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

46

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

15

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

3

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

10

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

46

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

8

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

13

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

37

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:20 PM

3

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:21 PM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:21 PM

46

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:21 PM

18

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:21 PM

28

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:25 PM

14

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:25 PM

12

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:30 PM

36

1283.50

CEUX

GENMAB A/S

16-Apr-2025

4:13:30 PM

9

1283.50

CEUX

GENMAB A/S

16-Apr-2025

4:13:44 PM

93

1283.00

XCSE

GENMAB A/S

16-Apr-2025

4:13:44 PM

13

1283.00

TQEX

GENMAB A/S

16-Apr-2025

4:13:44 PM

4

1283.00

TQEX

GENMAB A/S

16-Apr-2025

4:13:45 PM

46

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:45 PM

35

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:45 PM

10

1283.50

XCSE

201


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:13:45 PM

3

1283.50

XCSE

GENMAB A/S

16-Apr-2025

4:13:59 PM

3

1282.50

AQEU

GENMAB A/S

16-Apr-2025

4:14:25 PM

26

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:14:25 PM

36

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:14:25 PM

25

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:15:21 PM

31

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:15:21 PM

35

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:15:21 PM

3

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:15:21 PM

17

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:15:21 PM

34

1284.50

AQEU

GENMAB A/S

16-Apr-2025

4:15:21 PM

20

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:15:21 PM

13

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:15:35 PM

42

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:16:10 PM

87

1285.00

XCSE

GENMAB A/S

16-Apr-2025

4:16:10 PM

5

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:16:10 PM

4

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:16:10 PM

3

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:16:10 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:16:10 PM

2

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:16:10 PM

7

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:16:10 PM

3

1284.00

TQEX

GENMAB A/S

16-Apr-2025

4:16:10 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:16:10 PM

25

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:16:10 PM

50

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:16:10 PM

9

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:16:10 PM

42

1284.00

CEUX

GENMAB A/S

16-Apr-2025

4:16:12 PM

46

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:16:12 PM

15

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:16:17 PM

18

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:16:20 PM

92

1284.00

XCSE

GENMAB A/S

16-Apr-2025

4:16:20 PM

36

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:17:06 PM

89

1284.50

XCSE

GENMAB A/S

16-Apr-2025

4:17:19 PM

77

1284.50

CEUX

GENMAB A/S

16-Apr-2025

4:17:24 PM

34

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:17:24 PM

12

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:17:24 PM

20

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:17:24 PM

6

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:17:39 PM

36

1285.00

CEUX

GENMAB A/S

16-Apr-2025

4:18:05 PM

43

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:05 PM

45

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:05 PM

6

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:05 PM

2

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:05 PM

3

1285.50

XCSE

202


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:18:05 PM

2

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:05 PM

2

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:05 PM

2

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:05 PM

2

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:05 PM

5

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:05 PM

26

1285.50

AQEU

GENMAB A/S

16-Apr-2025

4:18:05 PM

13

1285.50

AQEU

GENMAB A/S

16-Apr-2025

4:18:05 PM

88

1285.50

CEUX

GENMAB A/S

16-Apr-2025

4:18:05 PM

4

1285.50

CEUX

GENMAB A/S

16-Apr-2025

4:18:05 PM

5

1285.50

CEUX

GENMAB A/S

16-Apr-2025

4:18:35 PM

7

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:35 PM

9

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:35 PM

90

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:35 PM

4

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:35 PM

8

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:35 PM

2

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:35 PM

13

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:18:37 PM

35

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:37 PM

46

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:37 PM

36

1285.50

CEUX

GENMAB A/S

16-Apr-2025

4:18:38 PM

46

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:18:38 PM

23

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:18:38 PM

67

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:18:38 PM

23

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:18:38 PM

4

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:18:39 PM

31

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:18:39 PM

46

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:18:39 PM

18

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:18:49 PM

16

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:18:57 PM

17

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:19:04 PM

46

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:19:04 PM

36

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:19:25 PM

87

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:19:25 PM

46

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:19:25 PM

41

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:19:29 PM

17

1285.50

AQEU

GENMAB A/S

16-Apr-2025

4:19:59 PM

9

1285.50

AQEU

GENMAB A/S

16-Apr-2025

4:20:27 PM

93

1286.50

XCSE

GENMAB A/S

16-Apr-2025

4:21:00 PM

75

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:21:00 PM

13

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:21:23 PM

18

1287.00

TQEX

GENMAB A/S

16-Apr-2025

4:21:23 PM

38

1287.00

TQEX

GENMAB A/S

16-Apr-2025

4:21:29 PM

26

1287.00

TQEX

203


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:21:35 PM

87

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:21:35 PM

31

1287.00

TQEX

GENMAB A/S

16-Apr-2025

4:21:45 PM

12

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:21:45 PM

79

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:22:05 PM

22

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:22:05 PM

18

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:22:05 PM

83

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:22:52 PM

25

1287.00

TQEX

GENMAB A/S

16-Apr-2025

4:22:52 PM

5

1287.00

TQEX

GENMAB A/S

16-Apr-2025

4:22:55 PM

80

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:23:08 PM

11

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:23:25 PM

88

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:23:25 PM

25

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:23:25 PM

54

1287.50

AQEU

GENMAB A/S

16-Apr-2025

4:24:15 PM

86

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:24:15 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:24:15 PM

16

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:24:15 PM

2

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:24:15 PM

93

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:24:15 PM

42

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:24:15 PM

19

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:24:15 PM

33

1287.50

AQEU

GENMAB A/S

16-Apr-2025

4:24:58 PM

38

1288.00

AQEU

GENMAB A/S

16-Apr-2025

4:25:04 PM

33

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:04 PM

27

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:05 PM

35

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:05 PM

26

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:05 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:06 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:06 PM

20

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:06 PM

18

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:06 PM

15

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:08 PM

10

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:08 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:55 PM

89

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:25:55 PM

93

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:26:19 PM

43

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:19 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:26:19 PM

17

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:26:19 PM

16

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:26:19 PM

23

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:26:20 PM

26

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:20 PM

18

1287.50

XCSE

204


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:26:20 PM

46

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:20 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:26:23 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:26:55 PM

46

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

21

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

15

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

35

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

7

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

25

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

46

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

15

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

16

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

8

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:55 PM

34

1287.00

TQEX

GENMAB A/S

16-Apr-2025

4:26:56 PM

8

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:56 PM

17

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:56 PM

15

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:56 PM

46

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:26:56 PM

22

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:27:15 PM

91

1286.50

XCSE

GENMAB A/S

16-Apr-2025

4:27:15 PM

8

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:27:15 PM

17

1286.50

AQEU

GENMAB A/S

16-Apr-2025

4:27:15 PM

9

1286.50

AQEU

GENMAB A/S

16-Apr-2025

4:27:36 PM

31

1286.50

XCSE

GENMAB A/S

16-Apr-2025

4:27:36 PM

24

1286.50

XCSE

GENMAB A/S

16-Apr-2025

4:27:36 PM

9

1286.00

TQEX

GENMAB A/S

16-Apr-2025

4:27:36 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:27:36 PM

52

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:27:42 PM

14

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:27:42 PM

18

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:27:55 PM

15

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:28:29 PM

24

1286.00

TQEX

GENMAB A/S

16-Apr-2025

4:28:52 PM

46

1286.50

XCSE

GENMAB A/S

16-Apr-2025

4:28:55 PM

5

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:28:55 PM

36

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:28:55 PM

86

1285.50

CEUX

GENMAB A/S

16-Apr-2025

4:28:56 PM

26

1285.50

AQEU

GENMAB A/S

16-Apr-2025

4:29:10 PM

30

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:29:49 PM

86

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:29:49 PM

8

1285.50

AQEU

GENMAB A/S

16-Apr-2025

4:30:15 PM

12

1285.00

TQEX

GENMAB A/S

16-Apr-2025

4:31:04 PM

88

1285.50

XCSE

GENMAB A/S

16-Apr-2025

4:31:04 PM

35

1286.00

XCSE

205


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:31:04 PM

46

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:04 PM

45

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:04 PM

7

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:04 PM

35

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:04 PM

30

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:04 PM

89

1285.50

CEUX

GENMAB A/S

16-Apr-2025

4:31:04 PM

30

1285.50

CEUX

GENMAB A/S

16-Apr-2025

4:31:04 PM

36

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:31:04 PM

9

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:31:04 PM

9

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:31:05 PM

23

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:05 PM

46

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:25 PM

21

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:31:25 PM

7

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:32:02 PM

46

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:32:02 PM

40

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:32:02 PM

3

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:32:02 PM

45

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:32:15 PM

30

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:32:46 PM

40

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:32:46 PM

51

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:32:46 PM

52

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:32:46 PM

32

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:33:15 PM

48

1287.50

TQEX

GENMAB A/S

16-Apr-2025

4:33:15 PM

13

1287.50

TQEX

GENMAB A/S

16-Apr-2025

4:33:15 PM

34

1287.50

AQEU

GENMAB A/S

16-Apr-2025

4:33:16 PM

10

1287.50

AQEU

GENMAB A/S

16-Apr-2025

4:33:24 PM

39

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:33:24 PM

35

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:33:24 PM

13

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:33:24 PM

28

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:33:24 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:24 PM

17

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:25 PM

46

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:33:25 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:26 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:26 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:29 PM

5

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:33:29 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:30 PM

17

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:36 PM

14

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:33:36 PM

43

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:33:53 PM

81

1288.00

CEUX

206


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:34:07 PM

12

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:34:22 PM

90

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:34:22 PM

35

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:34:22 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:34:22 PM

44

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:34:23 PM

7

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:34:29 PM

2

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:34:32 PM

35

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:34:32 PM

35

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:34:32 PM

35

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:34:55 PM

47

1286.50

TQEX

GENMAB A/S

16-Apr-2025

4:35:35 PM

13

1286.50

TQEX

GENMAB A/S

16-Apr-2025

4:35:35 PM

43

1286.50

AQEU

GENMAB A/S

16-Apr-2025

4:35:48 PM

35

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:35:48 PM

52

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:35:48 PM

9

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:35:48 PM

36

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:35:49 PM

21

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:36:15 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:15 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:15 PM

58

1286.50

TQEX

GENMAB A/S

16-Apr-2025

4:36:15 PM

26

1286.50

AQEU

GENMAB A/S

16-Apr-2025

4:36:16 PM

32

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:16 PM

7

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:16 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:16 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:16 PM

36

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:36:18 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:18 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:18 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:22 PM

25

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:22 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:22 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

19

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

19

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

33

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

17

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

16

1287.00

XCSE

207


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:36:23 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:23 PM

22

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

19

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

15

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

21

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

15

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:24 PM

3

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:25 PM

14

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:25 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:25 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:26 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:26 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:28 PM

16

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:28 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:28 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:28 PM

37

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:28 PM

46

1287.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:45 PM

79

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:36:45 PM

3

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:36:45 PM

9

1286.00

CEUX

GENMAB A/S

16-Apr-2025

4:36:46 PM

87

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:36:46 PM

34

1286.00

TQEX

GENMAB A/S

16-Apr-2025

4:36:47 PM

42

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:36:47 PM

22

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:36:47 PM

9

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:36:47 PM

8

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:36:47 PM

9

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:37:05 PM

73

1286.00

XCSE

GENMAB A/S

16-Apr-2025

4:37:05 PM

36

1286.50

CEUX

GENMAB A/S

16-Apr-2025

4:37:16 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:37:17 PM

4

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:37:20 PM

69

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:37:20 PM

1

1287.50

XCSE

GENMAB A/S

16-Apr-2025

4:37:20 PM

87

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:37:56 PM

59

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:37:56 PM

29

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:37:56 PM

80

1289.00

CEUX

208


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:38:04 PM

36

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:38:05 PM

36

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:38:09 PM

91

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:38:09 PM

15

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:38:35 PM

3

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:38:35 PM

37

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:38:38 PM

9

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:38:38 PM

24

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:38:38 PM

26

1288.00

TQEX

GENMAB A/S

16-Apr-2025

4:38:38 PM

36

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:39:13 PM

36

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:39:17 PM

35

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:39:17 PM

6

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:39:17 PM

23

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:39:17 PM

14

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:39:23 PM

16

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:39:45 PM

58

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:40:08 PM

7

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:40:08 PM

6

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:40:08 PM

6

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:41:25 PM

24

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:41:25 PM

66

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:41:26 PM

36

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:41:26 PM

36

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:41:27 PM

36

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:41:59 PM

48

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:43:05 PM

92

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:43:05 PM

34

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:43:05 PM

28

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:43:05 PM

86

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:43:05 PM

51

1290.50

AQEU

GENMAB A/S

16-Apr-2025

4:43:25 PM

20

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:43:25 PM

17

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:43:25 PM

46

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:43:43 PM

16

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:43:43 PM

4

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:43:43 PM

4

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:43:43 PM

2

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:43:46 PM

18

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:43:46 PM

25

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:43:46 PM

12

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:43:47 PM

7

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:43:49 PM

36

1290.50

CEUX

209


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:44:09 PM

89

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:44:49 PM

92

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:44:49 PM

25

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:44:49 PM

30

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:44:49 PM

40

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:44:49 PM

35

1291.50

CEUX

GENMAB A/S

16-Apr-2025

4:45:07 PM

88

1291.00

CEUX

GENMAB A/S

16-Apr-2025

4:45:19 PM

39

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:45:19 PM

54

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:45:19 PM

12

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:45:19 PM

27

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:45:19 PM

4

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:45:19 PM

52

1290.50

AQEU

GENMAB A/S

16-Apr-2025

4:45:19 PM

4

1290.50

AQEU

GENMAB A/S

16-Apr-2025

4:45:45 PM

79

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:45:45 PM

2

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:05 PM

6

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:09 PM

3

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:09 PM

3

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:09 PM

13

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:09 PM

5

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:09 PM

7

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:09 PM

7

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:09 PM

3

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:09 PM

4

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:09 PM

8

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:09 PM

4

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:09 PM

25

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:12 PM

90

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:46:12 PM

6

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:12 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:46:12 PM

46

1290.00

AQEU

GENMAB A/S

16-Apr-2025

4:46:35 PM

8

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:46:37 PM

35

1289.50

AQEU

GENMAB A/S

16-Apr-2025

4:47:05 PM

28

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:47:05 PM

61

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:47:11 PM

13

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:47:11 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:47:13 PM

18

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:47:13 PM

46

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:47:13 PM

23

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:47:13 PM

36

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:47:13 PM

8

1290.50

CEUX

210


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:47:13 PM

18

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:47:13 PM

25

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:47:14 PM

13

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:47:14 PM

36

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:47:25 PM

77

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:47:55 PM

89

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:47:55 PM

15

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:47:55 PM

10

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:48:04 PM

22

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:48:04 PM

4

1290.00

TQEX

GENMAB A/S

16-Apr-2025

4:48:04 PM

40

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:48:10 PM

4

1290.00

TQEX

GENMAB A/S

16-Apr-2025

4:48:35 PM

13

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:48:35 PM

79

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:48:39 PM

14

1290.50

TQEX

GENMAB A/S

16-Apr-2025

4:48:39 PM

86

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:48:39 PM

45

1290.50

AQEU

GENMAB A/S

16-Apr-2025

4:48:41 PM

3

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:41 PM

7

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:48:41 PM

86

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:48:48 PM

35

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:48 PM

26

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:48 PM

46

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:48 PM

36

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:48:53 PM

7

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:53 PM

35

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:54 PM

18

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:54 PM

22

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:54 PM

46

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:58 PM

17

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:48:58 PM

46

1290.50

XCSE

GENMAB A/S

16-Apr-2025

4:49:00 PM

15

1290.00

TQEX

GENMAB A/S

16-Apr-2025

4:49:00 PM

15

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:49:15 PM

87

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:49:15 PM

25

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:49:15 PM

3

1289.50

TQEX

GENMAB A/S

16-Apr-2025

4:49:15 PM

39

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:49:15 PM

49

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:49:20 PM

29

1289.50

AQEU

GENMAB A/S

16-Apr-2025

4:49:55 PM

9

1288.50

TQEX

GENMAB A/S

16-Apr-2025

4:49:55 PM

47

1288.50

TQEX

GENMAB A/S

16-Apr-2025

4:49:55 PM

72

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:49:55 PM

21

1288.50

CEUX

211


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:49:58 PM

18

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:50:00 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:05 PM

43

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:05 PM

2

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:05 PM

12

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:50:09 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:09 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:09 PM

36

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:50:09 PM

12

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:50:18 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:18 PM

20

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:18 PM

37

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:50:18 PM

29

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:19 PM

59

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:19 PM

32

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:19 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:19 PM

19

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

3

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

23

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

51

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

19

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:34 PM

30

1287.00

TQEX

GENMAB A/S

16-Apr-2025

4:50:34 PM

44

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

36

1287.50

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

14

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

12

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

6

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

19

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

14

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

6

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:34 PM

6

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:35 PM

25

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:35 PM

8

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:35 PM

36

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:55 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:55 PM

23

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:55 PM

7

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:55 PM

46

1288.00

XCSE

212


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:50:55 PM

45

1287.00

CEUX

GENMAB A/S

16-Apr-2025

4:50:56 PM

19

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

19

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

17

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

19

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

19

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:56 PM

29

1287.50

TQEX

GENMAB A/S

16-Apr-2025

4:50:56 PM

1

1287.50

TQEX

GENMAB A/S

16-Apr-2025

4:50:57 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:58 PM

2

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:58 PM

46

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:50:58 PM

15

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:51:00 PM

19

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:51:00 PM

9

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:51:02 PM

23

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:51:14 PM

1

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:51:14 PM

3

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:51:14 PM

46

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:51:14 PM

19

1289.00

XCSE

GENMAB A/S

16-Apr-2025

4:51:14 PM

21

1288.50

TQEX

GENMAB A/S

16-Apr-2025

4:51:14 PM

7

1288.50

TQEX

GENMAB A/S

16-Apr-2025

4:51:35 PM

89

1288.00

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

26

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

7

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

26

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

16

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

48

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

13

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

15

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:51:35 PM

88

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:51:35 PM

36

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:51:49 PM

13

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:51:49 PM

25

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:51:54 PM

9

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:52:04 PM

17

1290.50

CEUX

GENMAB A/S

16-Apr-2025

4:52:04 PM

49

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:06 PM

26

1290.00

TQEX

213


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:52:06 PM

40

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:06 PM

30

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:06 PM

26

1290.00

AQEU

GENMAB A/S

16-Apr-2025

4:52:08 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:12 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:13 PM

35

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:52:13 PM

3

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:52:13 PM

46

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:52:13 PM

33

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:52:13 PM

1

1290.00

XCSE

GENMAB A/S

16-Apr-2025

4:52:15 PM

3

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:26 PM

40

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:52:26 PM

51

1289.50

XCSE

GENMAB A/S

16-Apr-2025

4:52:26 PM

36

1290.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:26 PM

43

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:52:35 PM

76

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:35 PM

11

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:52:35 PM

27

1289.00

AQEU

GENMAB A/S

16-Apr-2025

4:52:39 PM

26

1289.00

TQEX

GENMAB A/S

16-Apr-2025

4:53:44 PM

8

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:44 PM

36

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:44 PM

43

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:54 PM

9

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:54 PM

52

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:53:54 PM

8

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:53:54 PM

8

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:53:54 PM

25

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:53:54 PM

35

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:53:54 PM

4

1288.00

CEUX

GENMAB A/S

16-Apr-2025

4:53:55 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:55 PM

46

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:55 PM

19

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:55 PM

17

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:55 PM

18

1288.50

XCSE

GENMAB A/S

16-Apr-2025

4:53:56 PM

9

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:54:14 PM

3

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:54:14 PM

30

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:54:14 PM

49

1288.50

CEUX

GENMAB A/S

16-Apr-2025

4:54:14 PM

5

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:54:14 PM

17

1289.00

CEUX

GENMAB A/S

16-Apr-2025

4:54:14 PM

69

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:54:14 PM

14

1288.50

AQEU

GENMAB A/S

16-Apr-2025

4:54:27 PM

19

1289.50

CEUX

214


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Graphic

GENMAB A/S

16-Apr-2025

4:54:27 PM

12

1289.50

CEUX

GENMAB A/S

16-Apr-2025

4:54:33 PM

59

1291.00

XCSE

GENMAB A/S

16-Apr-2025

4:54:41 PM

12

1291.00

XCSE

GENMAB A/S

16-Apr-2025

4:54:42 PM

14

1292.00

XCSE

GENMAB A/S

16-Apr-2025

4:54:42 PM

13

1292.00

CEUX

GENMAB A/S

16-Apr-2025

4:54:42 PM

69

1291.50

CEUX

GENMAB A/S

16-Apr-2025

4:54:42 PM

24

1291.50

CEUX

GENMAB A/S

16-Apr-2025

4:54:43 PM

46

1292.00

XCSE

GENMAB A/S

16-Apr-2025

4:54:43 PM

2

1292.00

XCSE

215


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