Exhibit 99.1

INDIVIOR PLC

TRANSACTIONS IN OWN SHARES

February 8, 2024

INDIVIOR PLC ("Indivior") announces that on February 7, 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 7, 2024
Number of ordinary shares purchased:	32,749
Highest Price per share:	1,390.00
Lowest Price per share:	1,369.00
Volume Weighted Average Price per share:	1,380.82

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 135,615,804 ordinary shares with voting rights in issue. There are no ordinary shares held in treasury.

The above figure (135,615,804) 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	12,313	1,381.69
CHIX	14,169	1,380.26
BATE	4,897	1,380.80
AQXE	1,370	1,378.80

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
08:02:20	1,384.00	56	XLON	E0HeMbsBkt67
08:03:05	1,384.00	183	XLON	E0HeMbsBkuA1
08:03:05	1,384.00	41	XLON	E0HeMbsBkuA4
08:04:03	1,382.00	209	XLON	E0HeMbsBkvmJ
08:13:02	1,388.00	444	CHIX	2977838244848
08:13:02	1,388.00	205	XLON	E0HeMbsBlCDv
08:16:22	1,382.00	223	CHIX	2977838245573
08:28:50	1,382.00	92	CHIX	2977838247690
08:28:50	1,382.00	132	CHIX	2977838247691
08:28:50	1,381.00	37	XLON	E0HeMbsBlb6n
08:28:50	1,381.00	190	XLON	E0HeMbsBlb6s
08:28:50	1,381.00	183	CHIX	2977838247693
08:28:50	1,381.00	44	CHIX	2977838247694
08:35:52	1,379.00	214	BATE	156728342548
08:42:37	1,377.00	45	CHIX	2977838250505
08:42:37	1,377.00	160	CHIX	2977838250506
08:49:42	1,377.00	14	XLON	E0HeMbsBm2DY
08:49:42	1,377.00	199	XLON	E0HeMbsBm2Db
08:56:05	1,387.00	242	BATE	156728345275
08:56:57	1,387.00	213	XLON	E0HeMbsBmBLV
08:57:01	1,386.00	25	CHIX	2977838252823
08:57:21	1,385.00	218	CHIX	2977838252887
09:00:00	1,382.00	102	XLON	E0HeMbsBmEF8
09:02:07	1,381.00	252	XLON	E0HeMbsBmGV7
09:14:46	1,384.00	29	XLON	E0HeMbsBmSIz
09:14:46	1,384.00	61	XLON	E0HeMbsBmSJ1
09:16:00	1,383.00	239	XLON	E0HeMbsBmTTD
09:16:00	1,382.00	156	BATE	156728347422
09:16:02	1,382.00	224	XLON	E0HeMbsBmTWp
09:16:02	1,382.00	93	BATE	156728347430
09:23:56	1,379.00	182	BATE	156728348270
09:33:34	1,383.00	77	AQXE	19323
09:33:34	1,383.00	3	XLON	E0HeMbsBmkpU
09:40:12	1,383.00	2	XLON	E0HeMbsBmsZC
09:40:25	1,384.00	250	CHIX	2977838260001
09:40:25	1,384.00	218	CHIX	2977838260002
09:44:17	1,387.00	228	XLON	E0HeMbsBmxEd
09:44:17	1,386.00	107	CHIX	2977838260592
09:44:17	1,386.00	357	CHIX	2977838260593
09:59:52	1,388.00	215	XLON	E0HeMbsBnBEc
10:02:04	1,389.00	426	XLON	E0HeMbsBnD7V
10:05:23	1,387.00	205	CHIX	2977838263384
10:05:23	1,387.00	22	CHIX	2977838263385
10:14:02	1,387.00	239	XLON	E0HeMbsBnNyn
10:14:27	1,385.00	17	CHIX	2977838264945
10:21:55	1,384.00	100	BATE	156728354158
10:21:55	1,384.00	107	BATE	156728354159
10:21:55	1,384.00	207	XLON	E0HeMbsBnVVc
10:26:02	1,382.00	46	CHIX	2977838266710
10:32:37	1,384.00	100	BATE	156728355111
10:32:37	1,384.00	45	BATE	156728355112
10:32:37	1,384.00	98	BATE	156728355113
10:36:02	1,381.00	176	CHIX	2977838268207
10:36:02	1,381.00	318	CHIX	2977838268208
10:49:14	1,382.00	232	BATE	156728356838
10:51:26	1,380.00	59	BATE	156728357037
10:51:26	1,380.00	156	BATE	156728357038
10:59:50	1,383.00	18	CHIX	2977838271948
10:59:50	1,383.00	69	CHIX	2977838271950
10:59:50	1,383.00	119	CHIX	2977838271951
11:04:29	1,384.00	219	XLON	E0HeMbsBo5LX
11:04:30	1,383.00	1	CHIX	2977838272834
11:04:30	1,383.00	101	BATE	156728358478
11:04:30	1,383.00	208	XLON	E0HeMbsBo5Ly
11:04:30	1,383.00	307	CHIX	2977838272835
11:31:29	1,388.00	23	XLON	E0HeMbsBoS0Z
11:35:35	1,388.00	100	CHIX	2977838277093
11:35:35	1,388.00	384	CHIX	2977838277094
11:35:35	1,389.00	61	XLON	E0HeMbsBoVNe
11:35:35	1,389.00	153	XLON	E0HeMbsBoVNg
11:35:35	1,389.00	91	XLON	E0HeMbsBoVNn
11:43:41	1,390.00	67	CHIX	2977838277903
11:43:41	1,390.00	57	CHIX	2977838277904
11:43:41	1,390.00	57	BATE	156728361879
11:43:41	1,390.00	67	BATE	156728361880
11:44:13	1,387.00	35	CHIX	2977838278045
11:44:13	1,387.00	195	CHIX	2977838278046
11:44:13	1,387.00	228	CHIX	2977838278047
11:49:23	1,386.00	106	BATE	156728362355
11:49:23	1,386.00	97	BATE	156728362356
11:56:27	1,385.00	209	XLON	E0HeMbsBojVy
12:03:53	1,382.00	245	CHIX	2977838280474
12:03:53	1,382.00	237	CHIX	2977838280477
12:12:12	1,381.00	155	XLON	E0HeMbsBowA6
12:12:12	1,381.00	57	XLON	E0HeMbsBowA8
12:16:10	1,379.00	113	CHIX	2977838281979
12:16:10	1,379.00	122	CHIX	2977838281980
12:19:05	1,378.00	33	XLON	E0HeMbsBozs4
12:19:05	1,378.00	201	XLON	E0HeMbsBozs6
12:36:32	1,388.00	151	XLON	E0HeMbsBp9xq
12:36:32	1,388.00	77	XLON	E0HeMbsBp9xs
12:40:08	1,388.00	164	XLON	E0HeMbsBpCBJ
12:40:08	1,388.00	55	XLON	E0HeMbsBpCBL
12:44:40	1,388.00	240	XLON	E0HeMbsBpEMm
12:49:39	1,388.00	245	XLON	E0HeMbsBpHsG
12:52:31	1,386.00	563	BATE	156728367792
13:06:09	1,385.00	173	AQXE	54506
13:06:09	1,385.00	48	XLON	E0HeMbsBpTFI
13:06:09	1,382.00	62	CHIX	2977838289056
13:06:09	1,382.00	149	CHIX	2977838289057
13:06:09	1,381.00	176	XLON	E0HeMbsBpTFz
13:06:09	1,381.00	27	XLON	E0HeMbsBpTG1
13:06:09	1,381.00	203	CHIX	2977838289061
13:15:47	1,377.00	226	CHIX	2977838290098
13:19:20	1,375.00	35	CHIX	2977838290629
13:19:20	1,375.00	204	CHIX	2977838290630
13:23:50	1,376.00	228	CHIX	2977838291358
13:33:51	1,380.00	436	XLON	E0HeMbsBpl9i
13:56:56	1,380.00	54	XLON	E0HeMbsBq0dE
13:57:40	1,382.00	36	AQXE	63618
13:57:40	1,382.00	37	BATE	156728374738
13:57:40	1,382.00	180	BATE	156728374739
13:57:40	1,382.00	37	BATE	156728374740
13:57:40	1,382.00	32	BATE	156728374741
13:57:40	1,382.00	80	XLON	E0HeMbsBq19H
13:57:41	1,382.00	45	BATE	156728374745
13:57:41	1,382.00	48	BATE	156728374746
13:57:41	1,382.00	37	CHIX	2977838297022
13:57:41	1,382.00	41	CHIX	2977838297023
13:57:41	1,382.00	52	XLON	E0HeMbsBq19n
13:57:41	1,382.00	57	XLON	E0HeMbsBq19p
13:58:06	1,383.00	414	XLON	E0HeMbsBq1o4
13:58:06	1,382.00	20	XLON	E0HeMbsBq1oG
13:58:06	1,382.00	91	CHIX	2977838297134
13:58:06	1,382.00	341	CHIX	2977838297135
13:58:06	1,382.00	207	XLON	E0HeMbsBq1oV
14:00:47	1,380.00	232	XLON	E0HeMbsBq4K5
14:07:43	1,376.00	226	XLON	E0HeMbsBqA7J
14:17:37	1,378.00	2	AQXE	68086
14:20:04	1,377.00	250	AQXE	68581
14:20:04	1,377.00	200	AQXE	68582
14:21:48	1,377.00	13	AQXE	69087
14:22:02	1,377.00	237	CHIX	2977838301562
14:25:21	1,378.00	165	XLON	E0HeMbsBqOxh
14:25:21	1,378.00	50	XLON	E0HeMbsBqOxj
14:25:32	1,377.00	141	CHIX	2977838302304
14:25:32	1,377.00	109	BATE	156728378474
14:25:32	1,377.00	193	CHIX	2977838302305
14:25:32	1,377.00	212	CHIX	2977838302309
14:25:32	1,377.00	224	XLON	E0HeMbsBqP54
14:30:37	1,376.00	211	CHIX	2977838303869
14:30:37	1,376.00	260	XLON	E0HeMbsBqX2U
14:34:31	1,375.00	64	BATE	156728380747
14:34:31	1,375.00	155	BATE	156728380748
14:42:34	1,375.00	153	CHIX	2977838308144
14:42:34	1,375.00	104	CHIX	2977838308145
14:42:34	1,375.00	22	XLON	E0HeMbsBqxC4
14:42:34	1,375.00	238	XLON	E0HeMbsBqxC6
14:49:13	1,376.00	234	CHIX	2977838310928
14:51:31	1,377.00	40	XLON	E0HeMbsBrCoM
14:51:31	1,377.00	91	XLON	E0HeMbsBrCoO
14:52:48	1,377.00	51	XLON	E0HeMbsBrEor
14:53:21	1,377.00	26	AQXE	81828
14:53:35	1,377.00	27	AQXE	81896
14:53:46	1,377.00	27	AQXE	81970
14:54:03	1,377.00	27	AQXE	82064
14:54:16	1,377.00	27	AQXE	82151
14:54:34	1,377.00	27	AQXE	82310
14:54:48	1,377.00	241	AQXE	82382
14:56:01	1,375.00	1	CHIX	2977838312899
14:56:01	1,375.00	375	CHIX	2977838312900
14:56:01	1,375.00	124	BATE	156728386455
14:56:01	1,375.00	241	XLON	E0HeMbsBrJkc
14:56:01	1,375.00	249	BATE	156728386456
14:56:01	1,375.00	5	BATE	156728386457
15:02:20	1,374.00	135	CHIX	2977838315167
15:02:20	1,374.00	86	CHIX	2977838315168
15:02:20	1,374.00	213	BATE	156728388196
15:02:20	1,374.00	220	BATE	156728388197
15:06:01	1,369.00	228	XLON	E0HeMbsBrZoX
15:06:01	1,369.00	233	XLON	E0HeMbsBrZoZ
15:18:05	1,374.00	5	CHIX	2977838319996
15:18:05	1,374.00	12	XLON	E0HeMbsBrp4t
15:18:15	1,376.00	245	CHIX	2977838320031
15:18:29	1,375.00	102	BATE	156728391647
15:18:29	1,375.00	209	XLON	E0HeMbsBrpXQ
15:18:29	1,375.00	309	CHIX	2977838320071
15:22:11	1,374.00	252	CHIX	2977838321302
15:22:11	1,374.00	248	CHIX	2977838321303
15:30:12	1,385.00	83	XLON	E0HeMbsBs3Pr
15:30:12	1,385.00	142	XLON	E0HeMbsBs3Pt
15:30:12	1,385.00	38	XLON	E0HeMbsBs3Pv
15:30:12	1,385.00	221	XLON	E0HeMbsBs3Px
15:31:40	1,386.00	256	CHIX	2977838324055
15:31:40	1,386.00	212	XLON	E0HeMbsBs5GC
15:31:40	1,386.00	21	XLON	E0HeMbsBs5GE
15:32:04	1,382.00	231	CHIX	2977838324178
15:41:06	1,379.00	225	CHIX	2977838326835
15:41:06	1,378.00	224	CHIX	2977838326836
15:41:06	1,378.00	221	CHIX	2977838326840
15:48:18	1,377.00	252	CHIX	2977838328999
15:48:18	1,377.00	129	CHIX	2977838329000
15:48:18	1,377.00	126	CHIX	2977838329001
15:55:35	1,379.00	217	AQXE	106240
15:56:21	1,378.00	262	XLON	E0HeMbsBsYk6
15:56:21	1,378.00	14	CHIX	2977838331537
15:56:21	1,378.00	374	CHIX	2977838331538
15:56:21	1,378.00	128	BATE	156728400556
16:04:56	1,381.00	8	CHIX	2977838334903
16:05:07	1,381.00	8	XLON	E0HeMbsBsih8
16:05:07	1,381.00	174	XLON	E0HeMbsBsihA
16:06:27	1,381.00	56	XLON	E0HeMbsBskGo
16:06:27	1,381.00	98	XLON	E0HeMbsBskGq
16:06:27	1,379.00	389	XLON	E0HeMbsBskGy
16:06:27	1,379.00	578	CHIX	2977838335443
16:06:27	1,379.00	190	BATE	156728403659
16:15:06	1,379.00	188	XLON	E0HeMbsBstTW
16:15:06	1,379.00	189	XLON	E0HeMbsBstTZ
16:15:06	1,379.00	10	BATE	156728406390
16:15:06	1,379.00	560	CHIX	2977838338835
16:15:06	1,379.00	174	BATE	156728406391
16:16:56	1,379.00	225	CHIX	2977838339644
16:16:56	1,379.00	212	CHIX	2977838339645
16:20:02	1,376.00	223	XLON	E0HeMbsBszRD
16:21:40	1,376.00	197	CHIX	2977838341947

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