Exhibit 99.1

INDIVIOR PLC

TRANSACTIONS IN OWN SHARES

February 13, 2024

INDIVIOR PLC ("Indivior") announces that on February 12, 2024, it purchased for cancellation the following number of its ordinary shares of $0.50 each through Morgan Stanley & Co. International Plc.

Ordinary Shares

Date of purchases:	February 12, 2024
Number of ordinary shares purchased:	32,434
Highest Price per share:	1,409.00
Lowest Price per share:	1,380.00
Volume Weighted Average Price per share:	1,393.92

Indivior intends to cancel all of the purchased shares.

All repurchases by Indivior are "On Exchange" transactions (as such term is defined in the rules of the London Stock Exchange) and "on market" for the purposes of the Companies Act 2006.

Following the above transaction and cancellation of the purchased shares, Indivior has 135,517,662 ordinary shares with voting rights in issue. There are no ordinary shares held in treasury.

The above figure (135,517,662) may be used by shareholders (and others with notification obligations) as the denominator for the calculation by which they will determine if they are required to notify their interest in, or a change to their interest in, Indivior under the FCA's Disclosure Guidance and Transparency Rules.

Aggregated information

Trading Venue	Aggregated volume (shares)	Volume weighted average price (p)
XLON	11,812	1,394.52
CHIX	13,970	1,394.03
BATE	5,350	1,393.56
AQXE	1,302	1,388.77

Contact:

Jason Thompson

Vice President, Investor Relations

1-804-402-7123

Transaction details

In accordance with Article 5(1)(b) of the Market Abuse Regulation (EU) No 596/2014, as it forms part of Retained EU Law as defined in the European Union (Withdrawal) Act 2018, a full breakdown of the individual purchases of ordinary shares made by Morgan Stanley & Co. International Plc on behalf of Indivior as part of the Share Repurchase Program is detailed below.

Time	Price (p)	Quantity	Venue	Reference
08:02:52	1,402.00	229	XLON	E0HhzPHpMxQS
08:02:52	1,402.00	6	XLON	E0HhzPHpMxQU
08:02:52	1,400.00	149	XLON	E0HhzPHpMxQg
08:02:52	1,400.00	91	XLON	E0HhzPHpMxQi
08:10:46	1,395.00	222	CHIX	2977838244808
08:10:46	1,395.00	215	BATE	156728333525
08:10:46	1,395.00	4	BATE	156728333526
08:23:38	1,408.00	219	BATE	156728335273
08:27:39	1,408.00	44	CHIX	2977838249262
08:27:39	1,408.00	29	CHIX	2977838249263
08:27:39	1,408.00	44	BATE	156728335812
08:27:39	1,408.00	120	XLON	E0HhzPHpNdkc
08:27:40	1,406.00	109	CHIX	2977838249264
08:27:40	1,406.00	151	CHIX	2977838249265
08:33:15	1,406.00	86	XLON	E0HhzPHpNmYn
08:33:15	1,406.00	36	XLON	E0HhzPHpNmYr
08:33:15	1,406.00	114	XLON	E0HhzPHpNmYt
08:37:29	1,405.00	225	CHIX	2977838251713
08:37:29	1,403.00	227	XLON	E0HhzPHpNskY
08:48:35	1,400.00	179	CHIX	2977838253286
08:48:48	1,400.00	74	CHIX	2977838253320
08:55:44	1,402.00	245	CHIX	2977838254671
08:55:44	1,401.00	235	XLON	E0HhzPHpOBWR
08:59:42	1,402.00	232	CHIX	2977838255154
09:10:49	1,409.00	245	XLON	E0HhzPHpOPjY
09:15:22	1,409.00	220	XLON	E0HhzPHpOUrB
09:15:39	1,407.00	34	CHIX	2977838257797
09:15:39	1,407.00	198	CHIX	2977838257798
09:15:39	1,405.00	210	XLON	E0HhzPHpOV4I
09:15:39	1,405.00	206	CHIX	2977838257802
09:27:20	1,399.00	215	CHIX	2977838259439
09:27:21	1,399.00	220	XLON	E0HhzPHpOfgI
09:39:40	1,392.00	220	CHIX	2977838260973
09:39:40	1,392.00	5	CHIX	2977838260974
09:39:40	1,391.00	213	XLON	E0HhzPHpOoG6
09:39:40	1,391.00	221	CHIX	2977838260975
09:54:06	1,399.00	158	XLON	E0HhzPHpOxiU
09:54:06	1,399.00	93	XLON	E0HhzPHpOxiW
09:59:15	1,399.00	27	CHIX	2977838263323
09:59:15	1,399.00	63	CHIX	2977838263324
09:59:15	1,399.00	115	XLON	E0HhzPHpP1Fu
09:59:15	1,399.00	1	XLON	E0HhzPHpP1Fw
10:03:39	1,399.00	29	CHIX	2977838263898
10:03:39	1,399.00	183	XLON	E0HhzPHpP47f
10:03:39	1,399.00	13	XLON	E0HhzPHpP47h
10:03:39	1,395.00	223	CHIX	2977838263905
10:13:24	1,394.00	99	CHIX	2977838265042
10:13:24	1,394.00	117	CHIX	2977838265043
10:18:04	1,394.00	225	CHIX	2977838265569
10:20:56	1,392.00	210	XLON	E0HhzPHpPFYh
10:20:56	1,392.00	176	XLON	E0HhzPHpPFYn
10:20:56	1,392.00	30	XLON	E0HhzPHpPFYp
10:20:56	1,392.00	105	CHIX	2977838265946
10:20:56	1,392.00	101	CHIX	2977838265947
10:48:22	1,399.00	660	CHIX	2977838269673
10:50:09	1,397.00	87	CHIX	2977838269897
10:50:09	1,397.00	109	BATE	156728347620
10:50:09	1,397.00	246	CHIX	2977838269898
10:50:09	1,397.00	224	XLON	E0HhzPHpPatf
11:12:03	1,398.00	109	CHIX	2977838272685
11:12:03	1,398.00	109	CHIX	2977838272686
11:12:03	1,398.00	142	CHIX	2977838272687
11:12:03	1,398.00	68	CHIX	2977838272688
11:18:31	1,399.00	40	BATE	156728349563
11:18:31	1,399.00	40	BATE	156728349564
11:18:31	1,399.00	138	BATE	156728349565
11:18:31	1,399.00	14	XLON	E0HhzPHpPryB
11:23:51	1,399.00	231	BATE	156728349976
11:26:01	1,397.00	229	XLON	E0HhzPHpPwS4
11:26:01	1,397.00	210	XLON	E0HhzPHpPwS6
11:39:56	1,399.00	227	CHIX	2977838276361
11:45:19	1,399.00	67	BATE	156728351568
11:45:19	1,399.00	169	BATE	156728351569
11:50:50	1,399.00	218	BATE	156728351897
11:56:06	1,399.00	223	BATE	156728352217
11:57:02	1,397.00	252	CHIX	2977838278137
11:57:02	1,397.00	53	BATE	156728352301
11:57:02	1,397.00	156	BATE	156728352302
12:02:04	1,384.00	149	CHIX	2977838278765
12:02:04	1,384.00	85	CHIX	2977838278766
12:16:57	1,384.00	89	CHIX	2977838280106
12:16:57	1,384.00	83	CHIX	2977838280107
12:16:57	1,384.00	7	CHIX	2977838280108
12:16:57	1,384.00	30	CHIX	2977838280109
12:21:46	1,384.00	232	AQXE	48784
12:21:46	1,381.00	155	XLON	E0HhzPHpQPWC
12:21:46	1,381.00	62	XLON	E0HhzPHpQPWE
12:21:46	1,381.00	201	AQXE	48785
12:21:46	1,381.00	194	BATE	156728354012
12:21:46	1,381.00	7	AQXE	48786
12:21:46	1,381.00	15	BATE	156728354013
12:32:19	1,380.00	163	XLON	E0HhzPHpQUB9
12:32:19	1,380.00	59	XLON	E0HhzPHpQUBB
12:34:14	1,383.00	123	BATE	156728354914
12:34:14	1,383.00	62	BATE	156728354915
12:34:14	1,383.00	52	BATE	156728354916
12:50:00	1,389.00	215	XLON	E0HhzPHpQddd
12:50:00	1,387.00	208	XLON	E0HhzPHpQdeB
12:50:00	1,387.00	183	XLON	E0HhzPHpQdeD
12:50:00	1,387.00	23	XLON	E0HhzPHpQdeG
12:50:00	1,387.00	214	CHIX	2977838284143
13:06:50	1,389.00	18	BATE	156728357544
13:06:50	1,389.00	136	XLON	E0HhzPHpQn0a
13:06:50	1,389.00	39	XLON	E0HhzPHpQn0c
13:06:50	1,389.00	32	XLON	E0HhzPHpQn0Y
13:09:04	1,390.00	114	CHIX	2977838286556
13:09:04	1,390.00	193	CHIX	2977838286557
13:09:04	1,390.00	101	BATE	156728357738
13:09:04	1,390.00	207	XLON	E0HhzPHpQorh
13:12:48	1,387.00	248	BATE	156728357987
13:20:15	1,389.00	211	CHIX	2977838287805
13:30:03	1,388.00	211	CHIX	2977838289028
13:30:03	1,388.00	117	CHIX	2977838289029
13:30:03	1,388.00	108	BATE	156728359264
13:30:03	1,388.00	221	XLON	E0HhzPHpQzyl
13:45:30	1,390.00	426	CHIX	2977838291015
13:48:27	1,390.00	238	CHIX	2977838291463
13:52:00	1,390.00	26	BATE	156728361241
13:52:00	1,390.00	26	BATE	156728361242
13:52:00	1,390.00	20	BATE	156728361243
13:52:00	1,390.00	138	BATE	156728361244
13:53:45	1,388.00	46	BATE	156728361347
13:53:45	1,388.00	238	XLON	E0HhzPHpRCLH
13:53:45	1,388.00	54	XLON	E0HhzPHpRCLJ
13:53:45	1,388.00	97	BATE	156728361348
13:53:45	1,388.00	435	CHIX	2977838292132
13:58:22	1,389.00	238	CHIX	2977838292931
14:12:14	1,390.00	209	AQXE	63516
14:12:32	1,389.00	23	CHIX	2977838295304
14:12:32	1,389.00	206	BATE	156728363164
14:12:32	1,389.00	190	CHIX	2977838295305
14:12:32	1,389.00	154	XLON	E0HhzPHpRR4P
14:12:32	1,389.00	53	XLON	E0HhzPHpRR4R
14:12:32	1,389.00	206	XLON	E0HhzPHpRR4T
14:22:19	1,389.00	218	CHIX	2977838296894
14:22:19	1,389.00	217	CHIX	2977838296895
14:32:27	1,391.00	2	XLON	E0HhzPHpRkIF
14:37:07	1,392.00	623	XLON	E0HhzPHpRrts
14:38:54	1,393.00	219	CHIX	2977838301673
14:41:16	1,396.00	231	XLON	E0HhzPHpRyZv
14:41:42	1,395.00	150	CHIX	2977838302921
14:41:42	1,395.00	98	BATE	156728367630
14:41:42	1,395.00	157	CHIX	2977838302922
14:41:42	1,395.00	113	CHIX	2977838302923
14:41:42	1,395.00	47	BATE	156728367631
14:41:42	1,395.00	22	CHIX	2977838302924
14:41:42	1,395.00	298	XLON	E0HhzPHpRzEM
14:41:50	1,394.00	122	BATE	156728367668
14:42:03	1,394.00	101	BATE	156728367738
14:42:03	1,394.00	79	XLON	E0HhzPHpRzl6
14:42:03	1,394.00	135	XLON	E0HhzPHpRzlB
14:55:13	1,395.00	232	XLON	E0HhzPHpSI6i
14:55:19	1,394.00	456	BATE	156728370408
14:59:24	1,396.00	248	AQXE	80738
15:05:11	1,396.00	220	XLON	E0HhzPHpSUtr
15:05:21	1,395.00	231	CHIX	2977838310128
15:05:21	1,395.00	243	CHIX	2977838310129
15:05:21	1,394.00	141	XLON	E0HhzPHpSVHj
15:05:21	1,394.00	209	XLON	E0HhzPHpSVHl
15:05:21	1,394.00	232	XLON	E0HhzPHpSVHn
15:05:21	1,394.00	31	CHIX	2977838310131
15:05:21	1,394.00	203	CHIX	2977838310132
15:17:30	1,400.00	424	XLON	E0HhzPHpSkOJ
15:17:50	1,398.00	115	CHIX	2977838313533
15:17:50	1,398.00	115	CHIX	2977838313534
15:17:50	1,398.00	256	XLON	E0HhzPHpSkkL
15:28:41	1,396.00	237	BATE	156728375864
15:30:06	1,394.00	39	CHIX	2977838316429
15:30:06	1,394.00	193	CHIX	2977838316430
15:30:06	1,394.00	57	CHIX	2977838316431
15:30:06	1,394.00	168	CHIX	2977838316432
15:31:42	1,395.00	235	CHIX	2977838317203
15:34:02	1,394.00	106	XLON	E0HhzPHpT0fJ
15:34:02	1,394.00	125	XLON	E0HhzPHpT0fL
15:40:10	1,392.00	257	BATE	156728378396
15:40:10	1,392.00	262	XLON	E0HhzPHpT6Uv
15:40:10	1,392.00	255	XLON	E0HhzPHpT6Ux
15:46:51	1,392.00	263	CHIX	2977838321669
15:46:51	1,392.00	249	BATE	156728379732
15:46:51	1,391.00	259	XLON	E0HhzPHpTCxx
15:46:51	1,391.00	245	XLON	E0HhzPHpTCxz
15:54:19	1,388.00	32	AQXE	101868
15:54:56	1,388.00	128	AQXE	102110
15:59:17	1,391.00	248	XLON	E0HhzPHpTNWo
16:01:48	1,391.00	207	CHIX	2977838326209
16:03:53	1,393.00	209	CHIX	2977838326774
16:04:34	1,391.00	324	XLON	E0HhzPHpTSwE
16:04:35	1,392.00	1	CHIX	2977838326974
16:08:08	1,392.00	16	CHIX	2977838328072
16:08:08	1,392.00	236	CHIX	2977838328073
16:08:08	1,392.00	317	CHIX	2977838328075
16:10:37	1,391.00	315	CHIX	2977838328796
16:10:37	1,391.00	297	CHIX	2977838328797
16:16:33	1,392.00	245	AQXE	112212
16:17:22	1,390.00	195	XLON	E0HhzPHpTeOR
16:17:22	1,390.00	246	XLON	E0HhzPHpTeOT
16:17:22	1,390.00	5	BATE	156728386550
16:17:22	1,390.00	277	BATE	156728386551
16:17:22	1,390.00	95	BATE	156728386552
16:17:22	1,390.00	290	CHIX	2977838331014
16:17:22	1,390.00	221	CHIX	2977838331015
16:24:26	1,391.00	321	CHIX	2977838334168

Indivior PLC's Legal Entity Identifier code is 213800V3NCQTY7IED471.