Transaction in own shares

OSB GROUP PLC                                        
ISIN: GB00BLDRH360
29 September 2025

LEI number: 213800ZBKL9BHSL2K459

OSB GROUP PLC (the “Company”)
Transaction in Own Shares

The Company announces that on 26 September 2025 it had purchased a total of 48,711 of its ordinary shares of £0.01 each (the "ordinary shares") on the London Stock Exchange, CBOE BXE and CBOE CXE, through the Company's broker Citigroup Global Markets Limited as detailed below. The repurchased ordinary shares will be cancelled.

	London Stock Exchange	CBOE BXE	CBOE CXE
Number of ordinary shares purchased	48,711	-	-
Highest price paid (per ordinary share)	557.00p	-	-
Lowest price paid (per ordinary share)	550.50p	-	-
Volume weighted average price paid (per ordinary share)	553.43p	-	-

The purchases form part of the Company’s share buyback programme announced on 13 March 2025.

Following settlement of the above purchases and cancellation of the purchased ordinary shares, the Company's total number of ordinary shares in issue shall be 360,220,488 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting rights in the Company is 360,220,488.

In accordance with Article 5(1)(b) of Regulation (EU) No 596/2014 as incorporated into and implemented under English law (including by virtue of the European Union (Withdrawal) Act 2018), the detailed breakdown of individual trades made by Citigroup Global Markets Limited on behalf of the Company as part of the share buyback programme is set out below.

This announcement does not constitute, or form part of, an offer or any solicitation of an offer for securities in any jurisdiction.

Schedule of Purchases – Individual Transactions

Issuer Name	OSB GROUP PLC
LEI	213800ZBKL9BHSL2K459
ISIN	GB00BLDRH360
Intermediary Name	Citigroup Global Markets Limited
Intermediary Code	SBILGB2L
Timezone	GMT+1
Currency	GBP

Transaction Date	Trade Time	Currency	Volume	Price	Trading Venue	Transaction ID
26-09-2025	16:10:41	GBp	1,399	552.00	XLON	xeaNiW@PpgT
26-09-2025	16:09:22	GBp	482	552.00	XLON	xeaNiW@Pm7a
26-09-2025	16:09:22	GBp	489	552.00	XLON	xeaNiW@Pm7c
26-09-2025	16:09:22	GBp	91	552.00	XLON	xeaNiW@Pm7h
26-09-2025	16:09:22	GBp	490	552.00	XLON	xeaNiW@Pm7j
26-09-2025	16:09:22	GBp	224	552.00	XLON	xeaNiW@Pm7l
26-09-2025	16:09:22	GBp	192	552.00	XLON	xeaNiW@Pm7n
26-09-2025	16:07:16	GBp	116	551.50	XLON	xeaNiW@P@vW
26-09-2025	15:59:38	GBp	904	550.50	XLON	xeaNiW@PvHu
26-09-2025	15:59:36	GBp	1,975	551.00	XLON	xeaNiW@PvJi
26-09-2025	15:59:36	GBp	239	552.00	XLON	xeaNiW@PvJk
26-09-2025	15:59:03	GBp	131	552.00	XLON	xeaNiW@Pc7v
26-09-2025	15:59:03	GBp	89	552.00	XLON	xeaNiW@Pc7x
26-09-2025	15:58:30	GBp	253	552.00	XLON	xeaNiW@Pdch
26-09-2025	15:57:46	GBp	94	552.00	XLON	xeaNiW@Pd2z
26-09-2025	15:57:46	GBp	96	552.00	XLON	xeaNiW@Pd2v
26-09-2025	15:57:46	GBp	15	552.00	XLON	xeaNiW@Pd2x
26-09-2025	15:57:13	GBp	146	552.00	XLON	xeaNiW@PaXT
26-09-2025	15:57:13	GBp	105	552.00	XLON	xeaNiW@PaXV
26-09-2025	15:56:29	GBp	222	552.00	XLON	xeaNiW@PaBa
26-09-2025	15:49:58	GBp	454	551.00	XLON	xeaNiW@Pl56
26-09-2025	15:47:19	GBp	217	551.00	XLON	xeaNiW@Pg11
26-09-2025	15:47:13	GBp	314	551.50	XLON	xeaNiW@Pg90
26-09-2025	15:34:26	GBp	408	552.00	XLON	xeaNiW@PQQI
26-09-2025	15:29:25	GBp	79	551.50	XLON	xeaNiW@P4Qz
26-09-2025	15:29:25	GBp	3,230	552.00	XLON	xeaNiW@P4Q4
26-09-2025	14:36:24	GBp	273	556.50	XLON	xeaNiW@QF2b
26-09-2025	14:36:24	GBp	50	556.50	XLON	xeaNiW@QF2Z
26-09-2025	14:33:31	GBp	1,100	557.00	XLON	xeaNiW@Q8EE
26-09-2025	14:33:31	GBp	566	557.00	XLON	xeaNiW@Q8EG
26-09-2025	14:33:31	GBp	6	557.00	XLON	xeaNiW@Q8EI
26-09-2025	14:33:31	GBp	78	557.00	XLON	xeaNiW@Q8ET
26-09-2025	14:33:31	GBp	597	557.00	XLON	xeaNiW@Q8EV
26-09-2025	14:33:31	GBp	369	556.50	XLON	xeaNiW@Q89c
26-09-2025	14:33:31	GBp	844	557.00	XLON	xeaNiW@Q89e
26-09-2025	14:19:43	GBp	755	555.50	XLON	xeaNiW@Rd81
26-09-2025	14:19:43	GBp	538	555.00	XLON	xeaNiW@Rd83
26-09-2025	14:19:43	GBp	116	555.50	XLON	xeaNiW@Rd8U
26-09-2025	14:19:43	GBp	161	555.50	XLON	xeaNiW@RdBW
26-09-2025	14:16:35	GBp	741	555.50	XLON	xeaNiW@RZ5F
26-09-2025	14:15:10	GBp	38	555.50	XLON	xeaNiW@RXZR
26-09-2025	14:15:10	GBp	117	555.50	XLON	xeaNiW@RXZT
26-09-2025	14:15:09	GBp	364	555.50	XLON	xeaNiW@RXjk
26-09-2025	14:15:06	GBp	392	555.50	XLON	xeaNiW@RXkd
26-09-2025	14:14:01	GBp	19	555.50	XLON	xeaNiW@Rkr8
26-09-2025	14:14:01	GBp	58	555.50	XLON	xeaNiW@RkrA
26-09-2025	14:13:29	GBp	222	555.50	XLON	xeaNiW@RkCF
26-09-2025	14:12:24	GBp	5	555.50	XLON	xeaNiW@RlCa
26-09-2025	14:12:24	GBp	7	555.50	XLON	xeaNiW@RlCc
26-09-2025	14:12:24	GBp	35	555.50	XLON	xeaNiW@RlCe
26-09-2025	14:12:24	GBp	20	555.50	XLON	xeaNiW@RlCg
26-09-2025	14:12:24	GBp	167	555.50	XLON	xeaNiW@RlCi
26-09-2025	14:12:24	GBp	62	555.50	XLON	xeaNiW@RlCk
26-09-2025	14:12:24	GBp	2	555.50	XLON	xeaNiW@RlCY
26-09-2025	14:11:13	GBp	14	555.50	XLON	xeaNiW@Rjhh
26-09-2025	14:11:13	GBp	186	555.50	XLON	xeaNiW@Rjhj
26-09-2025	14:11:13	GBp	91	556.00	XLON	xeaNiW@Rjhw
26-09-2025	14:11:13	GBp	219	556.00	XLON	xeaNiW@Rjh@
26-09-2025	14:11:13	GBp	250	556.00	XLON	xeaNiW@Rjh0
26-09-2025	14:11:13	GBp	690	556.00	XLON	xeaNiW@RjhA
26-09-2025	13:57:02	GBp	14	556.00	XLON	xeaNiW@RSiu
26-09-2025	13:57:02	GBp	14	556.00	XLON	xeaNiW@RSiw
26-09-2025	13:41:21	GBp	70	556.50	XLON	xeaNiW@RFFn
26-09-2025	13:41:21	GBp	278	556.50	XLON	xeaNiW@RFFp
26-09-2025	13:41:17	GBp	24	556.50	XLON	xeaNiW@RF8o
26-09-2025	13:41:17	GBp	81	556.50	XLON	xeaNiW@RF89
26-09-2025	13:41:17	GBp	176	556.50	XLON	xeaNiW@RF8B
26-09-2025	13:41:17	GBp	326	556.50	XLON	xeaNiW@RF8D
26-09-2025	13:41:17	GBp	295	556.50	XLON	xeaNiW@RF8V
26-09-2025	13:33:51	GBp	300	555.50	XLON	xeaNiW@KsPH
26-09-2025	13:33:51	GBp	184	555.50	XLON	xeaNiW@KsPJ
26-09-2025	13:32:07	GBp	21	555.50	XLON	xeaNiW@KqsK
26-09-2025	13:32:07	GBp	20	555.50	XLON	xeaNiW@KqsM
26-09-2025	13:32:07	GBp	63	555.50	XLON	xeaNiW@KqsO
26-09-2025	13:26:14	GBp	14	555.00	XLON	xeaNiW@K@bO
26-09-2025	13:26:14	GBp	287	555.00	XLON	xeaNiW@K@bQ
26-09-2025	13:24:00	GBp	63	555.00	XLON	xeaNiW@K$Pn
26-09-2025	13:24:00	GBp	155	555.00	XLON	xeaNiW@K$P9
26-09-2025	13:24:00	GBp	369	555.00	XLON	xeaNiW@K$PB
26-09-2025	13:16:55	GBp	14	555.50	XLON	xeaNiW@KvgK
26-09-2025	13:16:55	GBp	419	555.50	XLON	xeaNiW@KvgM
26-09-2025	13:16:55	GBp	338	555.50	XLON	xeaNiW@Kvrd
26-09-2025	13:16:55	GBp	2	555.50	XLON	xeaNiW@Kvrg
26-09-2025	13:16:55	GBp	367	555.50	XLON	xeaNiW@Kvrn
26-09-2025	13:16:55	GBp	26	555.50	XLON	xeaNiW@Kvrp
26-09-2025	12:40:06	GBp	45	554.00	XLON	xeaNiW@KQ9I
26-09-2025	12:39:46	GBp	17	554.00	XLON	xeaNiW@KRaa
26-09-2025	12:39:46	GBp	52	554.00	XLON	xeaNiW@KRac
26-09-2025	12:38:56	GBp	14	554.00	XLON	xeaNiW@KR0V
26-09-2025	12:38:44	GBp	154	554.50	XLON	xeaNiW@KREB
26-09-2025	12:38:44	GBp	328	554.50	XLON	xeaNiW@KR9$
26-09-2025	12:38:44	GBp	161	554.50	XLON	xeaNiW@KR9z
26-09-2025	12:31:58	GBp	286	555.00	XLON	xeaNiW@K48M
26-09-2025	12:20:03	GBp	449	554.00	XLON	xeaNiW@KDQR
26-09-2025	12:20:03	GBp	22	554.00	XLON	xeaNiW@KDQT
26-09-2025	12:20:03	GBp	14	554.00	XLON	xeaNiW@KDQV
26-09-2025	12:04:57	GBp	13	553.00	XLON	xeaNiW@LmRF
26-09-2025	12:02:16	GBp	352	553.00	XLON	xeaNiW@L$v@
26-09-2025	11:57:00	GBp	358	552.50	XLON	xeaNiW@LxON
26-09-2025	11:54:03	GBp	205	552.50	XLON	xeaNiW@LckN
26-09-2025	11:54:03	GBp	4	552.50	XLON	xeaNiW@LckP
26-09-2025	11:51:06	GBp	191	552.50	XLON	xeaNiW@LbX5
26-09-2025	11:51:06	GBp	107	552.50	XLON	xeaNiW@LbX7
26-09-2025	11:48:09	GBp	193	552.50	XLON	xeaNiW@LZ1R
26-09-2025	11:48:09	GBp	19	552.50	XLON	xeaNiW@LZ1T
26-09-2025	11:48:09	GBp	10	552.50	XLON	xeaNiW@LZ1V
26-09-2025	11:45:12	GBp	242	552.50	XLON	xeaNiW@LXID
26-09-2025	11:45:12	GBp	16	552.50	XLON	xeaNiW@LXIJ
26-09-2025	11:42:15	GBp	221	552.50	XLON	xeaNiW@LiXz
26-09-2025	11:39:18	GBp	217	552.50	XLON	xeaNiW@LhoU
26-09-2025	11:36:21	GBp	230	552.50	XLON	xeaNiW@Lf13
26-09-2025	11:21:23	GBp	353	552.50	XLON	xeaNiW@LSEb
26-09-2025	11:21:23	GBp	2	552.50	XLON	xeaNiW@LSEd
26-09-2025	11:21:02	GBp	108	552.50	XLON	xeaNiW@LSRu
26-09-2025	11:21:02	GBp	720	552.50	XLON	xeaNiW@LSRw
26-09-2025	11:11:11	GBp	721	552.50	XLON	xeaNiW@L7OI
26-09-2025	11:09:28	GBp	562	553.00	XLON	xeaNiW@L5rM
26-09-2025	11:09:26	GBp	52	553.00	XLON	xeaNiW@L5ti
26-09-2025	11:09:26	GBp	30	553.00	XLON	xeaNiW@L5tk
26-09-2025	11:09:26	GBp	90	553.00	XLON	xeaNiW@L5tm
26-09-2025	11:09:26	GBp	63	553.00	XLON	xeaNiW@L5to
26-09-2025	11:09:25	GBp	237	553.00	XLON	xeaNiW@L5tu
26-09-2025	11:09:25	GBp	485	552.50	XLON	xeaNiW@L5t$
26-09-2025	11:09:20	GBp	485	553.00	XLON	xeaNiW@L5pL
26-09-2025	10:45:13	GBp	188	552.50	XLON	xeaNiW@Mm5F
26-09-2025	10:45:13	GBp	90	552.50	XLON	xeaNiW@Mm5H
26-09-2025	10:45:13	GBp	15	552.50	XLON	xeaNiW@Mm5J
26-09-2025	10:43:13	GBp	60	552.50	XLON	xeaNiW@M@$i
26-09-2025	10:43:13	GBp	190	552.50	XLON	xeaNiW@M@$k
26-09-2025	10:43:13	GBp	52	552.50	XLON	xeaNiW@M@$m
26-09-2025	10:37:21	GBp	346	552.50	XLON	xeaNiW@MxSe
26-09-2025	10:36:17	GBp	485	552.50	XLON	xeaNiW@Mu6K
26-09-2025	10:27:21	GBp	262	553.00	XLON	xeaNiW@MWab
26-09-2025	10:27:21	GBp	77	553.00	XLON	xeaNiW@MWaf
26-09-2025	10:27:21	GBp	201	553.00	XLON	xeaNiW@MWaZ
26-09-2025	10:27:21	GBp	2,163	553.00	XLON	xeaNiW@MWbV
26-09-2025	10:27:21	GBp	485	552.50	XLON	xeaNiW@MWal
26-09-2025	10:25:49	GBp	217	553.00	XLON	xeaNiW@MWOn
26-09-2025	10:25:49	GBp	268	553.00	XLON	xeaNiW@MWOp
26-09-2025	10:07:48	GBp	203	552.50	XLON	xeaNiW@MGme
26-09-2025	10:07:48	GBp	600	552.50	XLON	xeaNiW@MGmg
26-09-2025	10:07:48	GBp	468	552.50	XLON	xeaNiW@MGmi
26-09-2025	09:43:22	GBp	401	552.00	XLON	xeaNiW@Ntc7
26-09-2025	09:09:28	GBp	115	551.50	XLON	xeaNiW@NjwG
26-09-2025	09:09:28	GBp	367	551.50	XLON	xeaNiW@NjwI
26-09-2025	09:07:35	GBp	433	552.00	XLON	xeaNiW@NhhA
26-09-2025	09:02:01	GBp	337	552.00	XLON	xeaNiW@NKDH
26-09-2025	08:59:48	GBp	279	552.50	XLON	xeaNiW@NIOp
26-09-2025	08:59:48	GBp	51	552.50	XLON	xeaNiW@NIOr
26-09-2025	08:58:11	GBp	37	553.00	XLON	xeaNiW@NGzS
26-09-2025	08:58:01	GBp	502	553.00	XLON	xeaNiW@NGD5
26-09-2025	08:56:34	GBp	526	553.00	XLON	xeaNiW@NHK9
26-09-2025	08:56:34	GBp	17	553.50	XLON	xeaNiW@NHKT
26-09-2025	08:49:51	GBp	199	554.00	XLON	xeaNiW@NQUY
26-09-2025	08:49:51	GBp	660	554.00	XLON	xeaNiW@NQUa
26-09-2025	08:49:51	GBp	485	554.00	XLON	xeaNiW@NQUq
26-09-2025	08:39:21	GBp	277	553.50	XLON	xeaNiW@N3VM
26-09-2025	08:30:17	GBp	744	552.50	XLON	xeaNiW@NAqv
26-09-2025	08:28:45	GBp	40	552.00	XLON	xeaNiW@NB$G
26-09-2025	08:17:11	GBp	330	552.50	XLON	xeaNiW@GpC7
26-09-2025	08:16:16	GBp	391	553.00	XLON	xeaNiW@GmtY
26-09-2025	08:16:16	GBp	786	553.00	XLON	xeaNiW@Gmtf
26-09-2025	08:09:45	GBp	334	553.50	XLON	xeaNiW@Gzdv
26-09-2025	08:05:13	GBp	33	553.00	XLON	xeaNiW@Gugg
26-09-2025	08:05:13	GBp	413	553.00	XLON	xeaNiW@Gugi
26-09-2025	08:05:11	GBp	745	553.50	XLON	xeaNiW@Gut6
26-09-2025	08:05:07	GBp	485	554.00	XLON	xeaNiW@Gup2