Exhibit 99.1

INDIVIOR PLC

TRANSACTIONS IN OWN SHARES

February 12, 2024

INDIVIOR PLC ("Indivior") announces that on February 9, 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 9, 2024
Number of ordinary shares purchased:	32,926
Highest Price per share:	1,408.00
Lowest Price per share:	1,383.00
Volume Weighted Average Price per share:	1,397.96

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 135,550,096 ordinary shares with voting rights in issue. There are no ordinary shares held in treasury.

The above figure (135,550,096) 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	10,762	1,396.24
CHIX	15,661	1,398.66
BATE	5,742	1,398.93
AQXE	761	1,400.30

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
08:06:16	1,384.00	422	XLON	E0HfoWq2nnck
08:06:16	1,383.00	208	XLON	E0HfoWq2nndH
08:18:20	1,386.00	201	XLON	E0HfoWq2o6XJ
08:18:20	1,386.00	23	XLON	E0HfoWq2o6XL
08:21:57	1,386.00	193	XLON	E0HfoWq2oBvk
08:21:57	1,386.00	25	XLON	E0HfoWq2oBvm
08:34:29	1,392.00	12	CHIX	2977838251204
08:34:31	1,392.00	1	CHIX	2977838251217
08:41:51	1,390.00	239	XLON	E0HfoWq2oY7r
08:41:51	1,390.00	426	XLON	E0HfoWq2oY7v
08:41:52	1,390.00	221	BATE	156728337934
08:42:37	1,395.00	210	XLON	E0HfoWq2oZNm
08:43:48	1,392.00	462	CHIX	2977838252639
08:54:58	1,391.00	1	BATE	156728339056
08:54:58	1,391.00	43	XLON	E0HfoWq2ompC
08:54:58	1,391.00	79	XLON	E0HfoWq2ompE
08:54:58	1,391.00	92	XLON	E0HfoWq2ompG
08:56:19	1,390.00	40	CHIX	2977838254422
08:56:19	1,390.00	384	CHIX	2977838254423
08:57:27	1,389.00	203	XLON	E0HfoWq2opAV
09:12:02	1,391.00	81	CHIX	2977838256500
09:12:02	1,391.00	126	CHIX	2977838256501
09:12:02	1,391.00	228	XLON	E0HfoWq2p3dZ
09:12:02	1,390.00	227	CHIX	2977838256502
09:12:02	1,390.00	209	CHIX	2977838256503
09:22:02	1,387.00	22	CHIX	2977838257794
09:22:02	1,387.00	187	CHIX	2977838257795
09:22:02	1,387.00	205	XLON	E0HfoWq2pB7w
09:35:37	1,392.00	222	XLON	E0HfoWq2pLfL
09:40:07	1,393.00	186	CHIX	2977838260087
09:40:19	1,390.00	22	XLON	E0HfoWq2pOia
09:40:19	1,390.00	191	XLON	E0HfoWq2pOic
09:46:28	1,389.00	210	CHIX	2977838260892
09:46:28	1,389.00	98	CHIX	2977838260893
09:47:10	1,389.00	84	CHIX	2977838260956
09:47:10	1,389.00	30	CHIX	2977838260957
09:49:33	1,388.00	208	XLON	E0HfoWq2pW0c
10:00:23	1,390.00	5	BATE	156728344163
10:00:23	1,390.00	94	BATE	156728344164
10:00:23	1,390.00	27	BATE	156728344165
10:03:04	1,390.00	193	BATE	156728344411
10:03:04	1,390.00	49	BATE	156728344412
10:07:03	1,388.00	149	CHIX	2977838263341
10:07:03	1,388.00	67	CHIX	2977838263342
10:07:03	1,388.00	149	XLON	E0HfoWq2phhe
10:07:03	1,388.00	70	XLON	E0HfoWq2phhg
10:07:03	1,388.00	180	XLON	E0HfoWq2phhi
10:07:03	1,388.00	35	XLON	E0HfoWq2phhk
10:22:40	1,392.00	12	BATE	156728346121
10:22:40	1,392.00	100	BATE	156728346122
10:24:49	1,392.00	42	BATE	156728346282
10:24:49	1,392.00	100	BATE	156728346283
10:30:28	1,395.00	244	XLON	E0HfoWq2pyFo
10:30:28	1,395.00	280	XLON	E0HfoWq2pyFq
10:30:28	1,395.00	196	XLON	E0HfoWq2pyFs
10:30:28	1,395.00	207	BATE	156728346771
10:54:00	1,395.00	174	BATE	156728348974
10:54:00	1,395.00	22	BATE	156728348975
10:54:00	1,395.00	15	BATE	156728348976
10:54:00	1,395.00	211	BATE	156728348977
10:54:00	1,395.00	452	CHIX	2977838269756
10:54:00	1,395.00	53	XLON	E0HfoWq2qBWz
10:54:00	1,395.00	152	XLON	E0HfoWq2qBX1
11:02:08	1,390.00	57	CHIX	2977838271049
11:15:23	1,398.00	210	BATE	156728351268
11:20:21	1,401.00	238	CHIX	2977838273652
11:24:13	1,399.00	204	CHIX	2977838274184
11:31:23	1,403.00	211	BATE	156728352746
11:34:32	1,402.00	213	BATE	156728353020
11:34:32	1,402.00	209	XLON	E0HfoWq2qb4T
11:36:57	1,402.00	223	CHIX	2977838275970
11:50:56	1,403.00	209	XLON	E0HfoWq2qlEN
11:51:29	1,405.00	112	BATE	156728354375
11:51:29	1,405.00	342	CHIX	2977838277651
11:51:29	1,405.00	86	XLON	E0HfoWq2qlZy
11:51:29	1,405.00	144	XLON	E0HfoWq2qla0
12:03:51	1,404.00	106	BATE	156728355538
12:03:51	1,404.00	126	BATE	156728355540
12:10:03	1,403.00	210	CHIX	2977838280016
12:18:03	1,399.00	152	CHIX	2977838281036
12:18:03	1,399.00	74	CHIX	2977838281037
12:18:03	1,398.00	220	CHIX	2977838281038
12:22:02	1,394.00	189	XLON	E0HfoWq2r2c2
12:36:09	1,399.00	12	CHIX	2977838283430
12:36:24	1,400.00	241	CHIX	2977838283438
12:36:24	1,399.00	36	AQXE	51753
12:36:24	1,399.00	15	CHIX	2977838283440
12:36:24	1,399.00	36	AQXE	51754
12:36:24	1,399.00	161	AQXE	51755
12:36:24	1,399.00	202	CHIX	2977838283441
12:49:40	1,398.00	214	CHIX	2977838284861
12:49:42	1,397.00	66	CHIX	2977838284865
12:55:22	1,402.00	243	CHIX	2977838285564
12:57:46	1,401.00	94	XLON	E0HfoWq2rOeu
12:57:46	1,401.00	119	XLON	E0HfoWq2rOew
12:57:46	1,401.00	70	CHIX	2977838285912
12:57:46	1,401.00	136	CHIX	2977838285913
13:02:02	1,403.00	158	CHIX	2977838286404
13:02:03	1,403.00	60	CHIX	2977838286406
13:05:57	1,403.00	112	BATE	156728360644
13:05:57	1,403.00	117	BATE	156728360645
13:09:09	1,405.00	231	BATE	156728360955
13:13:02	1,408.00	254	CHIX	2977838287736
13:26:10	1,408.00	209	XLON	E0HfoWq2rfEK
13:28:57	1,407.00	430	XLON	E0HfoWq2rhhP
13:28:57	1,406.00	244	CHIX	2977838289896
13:34:32	1,404.00	213	CHIX	2977838291712
13:34:32	1,403.00	222	XLON	E0HfoWq2rqjU
13:52:07	1,404.00	480	CHIX	2977838294745
13:52:16	1,403.00	233	BATE	156728365725
13:58:00	1,404.00	33	CHIX	2977838295595
13:58:00	1,404.00	100	CHIX	2977838295596
13:58:00	1,404.00	94	XLON	E0HfoWq2s80z
14:01:38	1,404.00	43	CHIX	2977838296157
14:01:38	1,404.00	24	CHIX	2977838296158
14:01:38	1,404.00	14	CHIX	2977838296159
14:01:38	1,404.00	159	XLON	E0HfoWq2sB3S
14:01:39	1,402.00	201	XLON	E0HfoWq2sB4i
14:01:39	1,402.00	98	BATE	156728366737
14:01:39	1,402.00	298	CHIX	2977838296163
14:01:39	1,402.00	224	CHIX	2977838296165
14:16:53	1,403.00	222	CHIX	2977838298661
14:19:18	1,401.00	207	XLON	E0HfoWq2sNeA
14:19:18	1,401.00	214	XLON	E0HfoWq2sNeE
14:19:18	1,401.00	77	CHIX	2977838299151
14:19:18	1,401.00	205	BATE	156728368799
14:19:18	1,401.00	128	CHIX	2977838299152
14:29:09	1,402.00	453	CHIX	2977838301381
14:29:09	1,402.00	269	XLON	E0HfoWq2sVy9
14:39:01	1,405.00	91	AQXE	80008
14:39:15	1,403.00	331	CHIX	2977838305021
14:39:15	1,403.00	58	CHIX	2977838305023
14:39:15	1,403.00	182	CHIX	2977838305024
14:41:39	1,403.00	388	XLON	E0HfoWq2srGi
14:41:39	1,403.00	117	XLON	E0HfoWq2srGk
14:41:39	1,403.00	114	XLON	E0HfoWq2srGm
14:41:39	1,403.00	54	CHIX	2977838305641
14:41:39	1,403.00	170	CHIX	2977838305642
14:41:39	1,403.00	65	CHIX	2977838305643
14:42:58	1,403.00	101	BATE	156728373458
14:49:05	1,404.00	449	BATE	156728374866
14:50:07	1,403.00	234	CHIX	2977838308512
14:58:46	1,403.00	279	BATE	156728376861
14:58:46	1,403.00	221	CHIX	2977838310929
14:58:46	1,403.00	26	AQXE	89116
14:58:46	1,403.00	194	AQXE	89117
14:58:46	1,403.00	213	XLON	E0HfoWq2tDGL
15:01:54	1,400.00	234	CHIX	2977838312112
15:11:08	1,399.00	205	CHIX	2977838314792
15:11:08	1,399.00	215	XLON	E0HfoWq2tTRe
15:14:39	1,398.00	61	BATE	156728380290
15:14:39	1,398.00	150	BATE	156728380291
15:14:39	1,398.00	214	CHIX	2977838315981
15:14:39	1,397.00	237	BATE	156728380294
15:14:39	1,397.00	212	BATE	156728380295
15:19:39	1,396.00	92	XLON	E0HfoWq2tdg2
15:19:39	1,396.00	118	XLON	E0HfoWq2tdg6
15:19:39	1,396.00	219	BATE	156728381370
15:23:22	1,395.00	239	CHIX	2977838318720
15:23:23	1,394.00	234	CHIX	2977838318726
15:30:03	1,395.00	20	CHIX	2977838320614
15:30:03	1,395.00	208	CHIX	2977838320615
15:36:23	1,398.00	245	XLON	E0HfoWq2tvVc
15:38:53	1,398.00	228	CHIX	2977838323590
15:41:09	1,399.00	31	CHIX	2977838324518
15:41:09	1,399.00	115	CHIX	2977838324519
15:41:09	1,399.00	71	CHIX	2977838324520
15:41:15	1,398.00	122	BATE	156728385772
15:41:15	1,398.00	370	CHIX	2977838324552
15:41:15	1,398.00	250	XLON	E0HfoWq2u0mr
15:41:15	1,397.00	217	AQXE	106854
15:41:15	1,397.00	219	CHIX	2977838324553
15:54:36	1,398.00	226	CHIX	2977838328173
15:59:01	1,399.00	151	CHIX	2977838329720
15:59:01	1,399.00	265	CHIX	2977838329721
15:59:01	1,399.00	58	CHIX	2977838329722
15:59:21	1,398.00	12	CHIX	2977838329882
15:59:21	1,398.00	214	CHIX	2977838329883
15:59:21	1,398.00	338	CHIX	2977838329886
15:59:21	1,398.00	111	BATE	156728389577
15:59:21	1,398.00	227	XLON	E0HfoWq2uGk0
16:02:02	1,400.00	428	CHIX	2977838331066
16:10:01	1,398.00	217	CHIX	2977838334110
16:10:01	1,398.00	291	CHIX	2977838334111
16:13:24	1,399.00	273	XLON	E0HfoWq2uVAj
16:13:24	1,399.00	262	XLON	E0HfoWq2uVAl
16:15:37	1,399.00	162	BATE	156728394597
16:18:39	1,401.00	586	CHIX	2977838338299
16:18:39	1,401.00	394	XLON	E0HfoWq2uaf0
16:18:39	1,401.00	192	BATE	156728395661
16:21:48	1,399.00	201	CHIX	2977838340056

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