Exhibit 99.1

INDIVIOR PLC

TRANSACTIONS IN OWN SHARES

April 15, 2024

INDIVIOR PLC ("Indivior") announces that on April 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:	April 12, 2024
Number of ordinary shares purchased:	34,912
Highest Price per share:	1,636.00
Lowest Price per share:	1,539.00
Volume Weighted Average Price per share:	1,578.04

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 135,679,697 ordinary shares with voting rights in issue. There are no ordinary shares held in treasury.

The above figure (135,679,697) 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	17,628	1,573.97
BATE	5,694	1,580.17
CHIX	10,161	1,583.50
AQXE	1,429	1,580.98

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
08:01:13	1,636.00	199	XLON	E0IPT66UuuHM
08:04:33	1,629.00	181	XLON	E0IPT66Uuzka
08:10:08	1,626.00	188	CHIX	2977838243259
08:20:25	1,625.00	175	XLON	E0IPT66UvKGG
08:20:27	1,624.00	179	XLON	E0IPT66UvKH9
08:20:27	1,623.00	175	XLON	E0IPT66UvKHQ
08:29:22	1,625.00	173	XLON	E0IPT66UvUeB
08:29:22	1,625.00	173	XLON	E0IPT66UvUeF
08:41:45	1,621.00	202	CHIX	2977838249686
08:41:45	1,619.00	179	CHIX	2977838249691
08:54:25	1,628.00	185	BATE	156728337653
09:00:07	1,629.00	27	XLON	E0IPT66Uvu2y
09:00:07	1,629.00	27	XLON	E0IPT66Uvu3K
09:00:49	1,629.00	27	XLON	E0IPT66UvuWh
09:01:26	1,629.00	186	CHIX	2977838252614
09:01:33	1,626.00	190	CHIX	2977838252639
09:01:34	1,625.00	132	BATE	156728338301
09:01:34	1,625.00	67	BATE	156728338302
09:09:50	1,623.00	89	CHIX	2977838253796
09:09:50	1,623.00	35	CHIX	2977838253797
09:09:50	1,623.00	88	CHIX	2977838253798
09:22:43	1,625.00	132	CHIX	2977838255849
09:22:43	1,625.00	48	CHIX	2977838255850
09:26:17	1,623.00	176	BATE	156728340640
09:26:17	1,623.00	172	XLON	E0IPT66Uw9XN
09:26:23	1,621.00	175	CHIX	2977838256419
09:42:02	1,627.00	196	CHIX	2977838258645
09:47:22	1,628.00	64	BATE	156728342588
09:47:22	1,628.00	35	AQXE	19390
09:47:41	1,627.00	177	XLON	E0IPT66UwO9O
09:47:41	1,626.00	183	CHIX	2977838259869
09:56:42	1,622.00	220	CHIX	2977838261464
10:07:27	1,625.00	98	CHIX	2977838263202
10:07:27	1,625.00	22	CHIX	2977838263203
10:07:27	1,625.00	61	CHIX	2977838263207
10:07:27	1,625.00	18	CHIX	2977838263209
10:13:26	1,627.00	193	XLON	E0IPT66UwfLl
10:17:18	1,624.00	187	XLON	E0IPT66Uwi71
10:17:18	1,624.00	187	XLON	E0IPT66Uwi73
10:17:39	1,622.00	83	AQXE	24171
10:32:10	1,623.00	150	XLON	E0IPT66UwsSh
10:32:10	1,623.00	63	XLON	E0IPT66UwsSj
10:32:18	1,622.00	207	XLON	E0IPT66Uwsbo
10:47:02	1,623.00	188	BATE	156728348186
10:50:30	1,622.00	2	AQXE	29692
10:53:14	1,624.00	134	BATE	156728348707
10:53:14	1,624.00	57	BATE	156728348708
10:59:35	1,624.00	201	CHIX	2977838270801
11:00:05	1,622.00	353	AQXE	31226
11:11:03	1,620.00	167	CHIX	2977838272596
11:15:06	1,619.00	73	BATE	156728350516
11:15:06	1,619.00	180	XLON	E0IPT66UxIay
11:15:06	1,619.00	105	BATE	156728350517
11:28:05	1,617.00	182	XLON	E0IPT66UxOmp
11:28:05	1,616.00	127	BATE	156728351405
11:28:05	1,616.00	49	BATE	156728351406
11:43:49	1,609.00	213	CHIX	2977838276504
11:44:49	1,606.00	191	XLON	E0IPT66UxXMZ
11:47:14	1,602.00	184	XLON	E0IPT66UxZE0
12:00:50	1,600.00	173	BATE	156728354393
12:10:23	1,600.00	178	XLON	E0IPT66UxsHM
12:10:23	1,600.00	233	CHIX	2977838280808
12:10:23	1,600.00	90	BATE	156728355105
12:10:23	1,600.00	38	AQXE	41416
12:29:00	1,597.00	185	XLON	E0IPT66Uy44m
12:34:32	1,597.00	11	CHIX	2977838283526
12:34:45	1,597.00	10	CHIX	2977838283529
12:35:08	1,597.00	5	CHIX	2977838283573
12:35:08	1,597.00	7	CHIX	2977838283574
12:35:34	1,597.00	9	CHIX	2977838283601
12:39:30	1,597.00	6	CHIX	2977838283958
12:39:30	1,597.00	4	CHIX	2977838283959
12:41:09	1,597.00	61	CHIX	2977838284165
12:44:51	1,597.00	8	BATE	156728357545
12:45:06	1,596.00	321	XLON	E0IPT66UyDHo
12:45:06	1,596.00	35	AQXE	45631
12:48:37	1,599.00	174	XLON	E0IPT66UyFCI
12:48:52	1,597.00	154	XLON	E0IPT66UyFL1
12:48:52	1,597.00	238	XLON	E0IPT66UyFL6
13:00:29	1,607.00	15	XLON	E0IPT66UyMB4
13:00:29	1,607.00	10	XLON	E0IPT66UyMBF
13:01:40	1,606.00	180	CHIX	2977838286976
13:01:40	1,607.00	189	XLON	E0IPT66UyMl4
13:08:36	1,598.00	201	CHIX	2977838288052
13:17:49	1,597.00	197	BATE	156728360523
13:23:55	1,605.00	202	CHIX	2977838290271
13:23:55	1,606.00	196	XLON	E0IPT66Uyapq
13:34:52	1,600.00	188	XLON	E0IPT66UyjYk
13:34:52	1,599.00	190	XLON	E0IPT66UyjZ0
13:34:52	1,599.00	19	CHIX	2977838292399
13:34:52	1,599.00	10	CHIX	2977838292400
13:34:52	1,599.00	154	CHIX	2977838292401
13:39:37	1,597.00	120	BATE	156728363066
13:39:37	1,597.00	83	BATE	156728363067
13:50:13	1,592.00	186	CHIX	2977838296658
13:50:15	1,591.00	17	CHIX	2977838296661
13:50:15	1,591.00	163	CHIX	2977838296662
13:50:15	1,591.00	87	CHIX	2977838296665
13:50:15	1,591.00	91	CHIX	2977838296666
14:00:00	1,590.00	186	BATE	156728366718
14:00:00	1,589.00	186	BATE	156728366721
14:01:12	1,587.00	108	XLON	E0IPT66UzGMp
14:01:12	1,587.00	95	XLON	E0IPT66UzGMr
14:13:02	1,584.00	73	XLON	E0IPT66UzWC0
14:13:02	1,584.00	103	XLON	E0IPT66UzWC4
14:13:02	1,585.00	176	CHIX	2977838303372
14:13:02	1,585.00	173	CHIX	2977838303373
14:21:06	1,581.00	189	XLON	E0IPT66UzfaS
14:21:06	1,581.00	4	XLON	E0IPT66UzfaU
14:21:13	1,580.00	192	XLON	E0IPT66UzfnK
14:28:55	1,581.00	175	XLON	E0IPT66UzmTq
14:30:00	1,580.00	183	BATE	156728372065
14:30:00	1,580.00	175	BATE	156728372066
14:30:01	1,579.00	194	CHIX	2977838307704
14:33:57	1,573.00	197	XLON	E0IPT66V00zB
14:40:30	1,575.00	181	XLON	E0IPT66V0CMy
14:40:30	1,575.00	201	AQXE	74964
14:40:30	1,576.00	125	CHIX	2977838312338
14:40:30	1,576.00	54	CHIX	2977838312339
14:43:23	1,572.00	160	BATE	156728375705
14:48:21	1,572.00	227	CHIX	2977838314840
14:51:35	1,576.00	220	CHIX	2977838315966
14:51:35	1,576.00	3	CHIX	2977838315967
14:51:35	1,576.00	192	CHIX	2977838315968
14:57:51	1,569.00	193	CHIX	2977838318167
14:57:51	1,568.00	190	BATE	156728378998
15:02:21	1,562.00	177	CHIX	2977838320444
15:02:21	1,561.00	186	BATE	156728380375
15:06:56	1,558.00	183	CHIX	2977838321988
15:06:56	1,559.00	178	BATE	156728381323
15:15:22	1,565.00	109	CHIX	2977838325479
15:15:22	1,565.00	82	CHIX	2977838325480
15:16:01	1,563.00	177	CHIX	2977838325757
15:16:01	1,562.00	176	XLON	E0IPT66V1D1Y
15:23:05	1,568.00	185	XLON	E0IPT66V1OdF
15:27:09	1,567.00	179	BATE	156728386067
15:27:14	1,565.00	17	CHIX	2977838329605
15:27:14	1,565.00	188	CHIX	2977838329606
15:27:14	1,566.00	173	BATE	156728386107
15:27:14	1,566.00	178	AQXE	93013
15:30:25	1,557.00	201	XLON	E0IPT66V1bJG
15:38:57	1,552.00	185	CHIX	2977838333878
15:38:57	1,552.00	143	BATE	156728388966
15:38:57	1,552.00	40	BATE	156728388967
15:38:57	1,551.00	179	XLON	E0IPT66V1nIx
15:42:53	1,546.00	99	XLON	E0IPT66V1sth
15:42:53	1,546.00	79	XLON	E0IPT66V1stl
15:42:53	1,546.00	186	XLON	E0IPT66V1stn
15:49:52	1,547.00	184	CHIX	2977838337621
15:49:52	1,547.00	209	BATE	156728391387
15:50:00	1,545.00	196	AQXE	101189
15:52:26	1,539.00	198	XLON	E0IPT66V269j
15:54:53	1,546.00	685	CHIX	2977838339693
15:54:53	1,546.00	264	BATE	156728392769
16:00:11	1,547.00	600	XLON	E0IPT66V2GgI
16:00:11	1,547.00	451	XLON	E0IPT66V2GgO
16:00:11	1,547.00	149	XLON	E0IPT66V2GgQ
16:00:11	1,547.00	576	XLON	E0IPT66V2GgS
16:00:17	1,545.00	294	XLON	E0IPT66V2Grd
16:00:17	1,545.00	384	XLON	E0IPT66V2Grf
16:00:17	1,545.00	386	CHIX	2977838341587
16:00:17	1,545.00	505	CHIX	2977838341588
16:00:17	1,545.00	149	BATE	156728394180
16:00:17	1,545.00	195	BATE	156728394181
16:00:17	1,545.00	63	AQXE	105604
16:00:17	1,545.00	82	AQXE	105605
16:07:10	1,549.00	212	XLON	E0IPT66V2QSj
16:07:10	1,549.00	388	XLON	E0IPT66V2QSl
16:07:10	1,549.00	118	XLON	E0IPT66V2QSs
16:07:10	1,549.00	388	XLON	E0IPT66V2QSv
16:07:10	1,549.00	94	XLON	E0IPT66V2QSx
16:07:10	1,549.00	294	XLON	E0IPT66V2QSz
16:07:10	1,549.00	362	XLON	E0IPT66V2QT5
16:10:26	1,553.00	137	XLON	E0IPT66V2VN4
16:10:26	1,553.00	512	XLON	E0IPT66V2VN6
16:10:26	1,553.00	512	XLON	E0IPT66V2VNA
16:10:26	1,553.00	137	XLON	E0IPT66V2VNC
16:10:26	1,553.00	127	XLON	E0IPT66V2VNE
16:10:26	1,553.00	532	XLON	E0IPT66V2VNI
16:10:26	1,552.00	263	XLON	E0IPT66V2VNc
16:10:26	1,552.00	104	XLON	E0IPT66V2VNe
16:10:26	1,552.00	68	XLON	E0IPT66V2VNg
16:10:26	1,552.00	327	XLON	E0IPT66V2VNY
16:10:26	1,552.00	430	CHIX	2977838345843
16:10:26	1,552.00	344	CHIX	2977838345845
16:10:26	1,552.00	155	CHIX	2977838345846
16:10:26	1,552.00	70	CHIX	2977838345847
16:10:26	1,552.00	166	BATE	156728397160
16:10:26	1,552.00	26	BATE	156728397161
16:10:26	1,552.00	107	BATE	156728397162
16:10:26	1,552.00	87	BATE	156728397163
16:10:26	1,552.00	484	BATE	156728397164
16:10:26	1,552.00	70	AQXE	110063
16:10:26	1,552.00	56	AQXE	110064
16:10:26	1,552.00	37	AQXE	110065
16:14:54	1,564.00	450	XLON	E0IPT66V2dHb
16:14:54	1,564.00	169	XLON	E0IPT66V2dHd
16:14:54	1,564.00	619	XLON	E0IPT66V2dHp
16:14:54	1,564.00	244	XLON	E0IPT66V2dHt
16:14:54	1,563.00	608	XLON	E0IPT66V2dIH
16:14:56	1,563.00	132	XLON	E0IPT66V2dNb
16:14:56	1,563.00	95	XLON	E0IPT66V2dNg
16:14:56	1,563.00	70	XLON	E0IPT66V2dNi
16:14:56	1,563.00	112	XLON	E0IPT66V2dNk
16:14:56	1,563.00	33	XLON	E0IPT66V2dNZ
16:14:56	1,563.00	180	CHIX	2977838347841

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