Transaction in own shares

OSB GROUP PLC                                        
ISIN: GB00BLDRH360
06 October 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 03 October 2025 it had purchased a total of 47,269 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	47,269	-	-
Highest price paid (per ordinary share)	563.50p	-	-
Lowest price paid (per ordinary share)	560.50p	-	-
Volume weighted average price paid (per ordinary share)	562.28p	-	-

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 360,084,887 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting rights in the Company is 360,084,887.

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
03-10-2025	16:28:33	GBp	74	563.00	XLON	xeaNjjFvRkJ
03-10-2025	16:28:33	GBp	261	563.00	XLON	xeaNjjFvRkR
03-10-2025	16:28:33	GBp	67	563.00	XLON	xeaNjjFvRkT
03-10-2025	16:25:00	GBp	60	562.50	XLON	xeaNjjFv6aE
03-10-2025	16:25:00	GBp	253	562.50	XLON	xeaNjjFv6aG
03-10-2025	16:24:30	GBp	93	562.50	XLON	xeaNjjFv6o$
03-10-2025	16:24:30	GBp	192	562.50	XLON	xeaNjjFv6o1
03-10-2025	16:24:00	GBp	58	562.50	XLON	xeaNjjFv6Gk
03-10-2025	16:24:00	GBp	14	562.50	XLON	xeaNjjFv6Gm
03-10-2025	16:24:00	GBp	229	562.50	XLON	xeaNjjFv6Go
03-10-2025	16:23:35	GBp	254	562.50	XLON	xeaNjjFv7l$
03-10-2025	16:12:30	GBp	328	560.50	XLON	xeaNjjFvC84
03-10-2025	16:10:00	GBp	394	561.00	XLON	xeaNjjFvA3s
03-10-2025	16:10:00	GBp	900	561.50	XLON	xeaNjjFvA3u
03-10-2025	16:02:30	GBp	569	562.00	XLON	xeaNjjFwqn0
03-10-2025	16:02:29	GBp	1,859	562.50	XLON	xeaNjjFwqnV
03-10-2025	16:00:01	GBp	1,064	562.50	XLON	xeaNjjFwo36
03-10-2025	15:53:55	GBp	185	561.00	XLON	xeaNjjFw$Lf
03-10-2025	15:53:47	GBp	8	561.00	XLON	xeaNjjFw$Jo
03-10-2025	15:53:21	GBp	6	561.00	XLON	xeaNjjFwyrg
03-10-2025	15:52:28	GBp	108	561.00	XLON	xeaNjjFwzXu
03-10-2025	15:43:47	GBp	79	561.00	XLON	xeaNjjFwWJo
03-10-2025	15:43:30	GBp	114	562.00	XLON	xeaNjjFwXi$
03-10-2025	15:43:30	GBp	16	562.00	XLON	xeaNjjFwXi1
03-10-2025	15:43:30	GBp	79	562.00	XLON	xeaNjjFwXi3
03-10-2025	15:43:30	GBp	1	562.00	XLON	xeaNjjFwXi5
03-10-2025	15:40:14	GBp	350	562.00	XLON	xeaNjjFwjl7
03-10-2025	15:40:14	GBp	261	561.50	XLON	xeaNjjFwjl9
03-10-2025	15:40:14	GBp	751	561.50	XLON	xeaNjjFwjlF
03-10-2025	15:26:50	GBp	78	561.50	XLON	xeaNjjFwSJb
03-10-2025	15:26:50	GBp	125	561.50	XLON	xeaNjjFwSJZ
03-10-2025	15:20:56	GBp	86	561.50	XLON	xeaNjjFw4Yy
03-10-2025	15:20:56	GBp	257	561.50	XLON	xeaNjjFw4Y@
03-10-2025	15:20:56	GBp	320	561.00	XLON	xeaNjjFw4Y5
03-10-2025	15:20:54	GBp	550	562.00	XLON	xeaNjjFw4ld
03-10-2025	15:20:54	GBp	15	562.00	XLON	xeaNjjFw4lf
03-10-2025	15:20:54	GBp	73	562.00	XLON	xeaNjjFw4lh
03-10-2025	15:20:54	GBp	96	562.00	XLON	xeaNjjFw4lj
03-10-2025	15:20:54	GBp	192	562.00	XLON	xeaNjjFw4ll
03-10-2025	15:20:54	GBp	273	562.00	XLON	xeaNjjFw4ln
03-10-2025	15:20:54	GBp	520	562.00	XLON	xeaNjjFw4lp
03-10-2025	15:20:54	GBp	48	562.00	XLON	xeaNjjFw4lr
03-10-2025	15:20:54	GBp	700	562.00	XLON	xeaNjjFw4lt
03-10-2025	15:20:54	GBp	286	561.50	XLON	xeaNjjFw4lw
03-10-2025	15:20:54	GBp	201	561.50	XLON	xeaNjjFw4ly
03-10-2025	15:19:52	GBp	258	562.00	XLON	xeaNjjFw5o0
03-10-2025	15:19:52	GBp	19	562.00	XLON	xeaNjjFw5zr
03-10-2025	15:03:11	GBp	570	562.00	XLON	xeaNjjFx@VF
03-10-2025	15:03:11	GBp	585	562.00	XLON	xeaNjjFx@VK
03-10-2025	15:03:11	GBp	86	562.00	XLON	xeaNjjFx@VM
03-10-2025	15:02:57	GBp	436	562.50	XLON	xeaNjjFx$nt
03-10-2025	15:02:57	GBp	237	562.50	XLON	xeaNjjFx$nv
03-10-2025	14:47:00	GBp	661	563.00	XLON	xeaNjjFxeYs
03-10-2025	14:42:25	GBp	4	563.00	XLON	xeaNjjFxI6x
03-10-2025	14:42:25	GBp	35	563.00	XLON	xeaNjjFxI6z
03-10-2025	14:37:45	GBp	82	562.00	XLON	xeaNjjFxS1L
03-10-2025	14:37:45	GBp	1,046	562.50	XLON	xeaNjjFxS1M
03-10-2025	14:37:45	GBp	65	562.50	XLON	xeaNjjFxS0d
03-10-2025	14:37:45	GBp	569	562.50	XLON	xeaNjjFxS0W
03-10-2025	14:37:45	GBp	250	562.50	XLON	xeaNjjFxS0Y
03-10-2025	14:37:45	GBp	1	562.50	XLON	xeaNjjFxS1O
03-10-2025	14:37:45	GBp	9	562.50	XLON	xeaNjjFxS1Q
03-10-2025	14:37:45	GBp	78	562.50	XLON	xeaNjjFxS1S
03-10-2025	14:37:45	GBp	1	562.50	XLON	xeaNjjFxS1U
03-10-2025	14:37:45	GBp	486	562.00	XLON	xeaNjjFxS0i
03-10-2025	14:37:37	GBp	294	562.50	XLON	xeaNjjFxS8J
03-10-2025	14:37:37	GBp	328	562.50	XLON	xeaNjjFxS8L
03-10-2025	14:05:49	GBp	524	563.00	XLON	xeaNjjFqyNB
03-10-2025	14:05:49	GBp	55	563.00	XLON	xeaNjjFqyND
03-10-2025	14:05:49	GBp	237	563.00	XLON	xeaNjjFqyMY
03-10-2025	14:05:45	GBp	286	563.00	XLON	xeaNjjFqyGe
03-10-2025	14:05:45	GBp	79	563.00	XLON	xeaNjjFqyGg
03-10-2025	14:05:45	GBp	560	563.00	XLON	xeaNjjFqyGi
03-10-2025	14:02:05	GBp	512	563.00	XLON	xeaNjjFqubA
03-10-2025	14:02:05	GBp	210	563.00	XLON	xeaNjjFqubC
03-10-2025	14:02:05	GBp	250	563.00	XLON	xeaNjjFqubE
03-10-2025	14:02:05	GBp	502	563.00	XLON	xeaNjjFqubG
03-10-2025	14:02:05	GBp	198	563.00	XLON	xeaNjjFquar
03-10-2025	14:02:05	GBp	358	562.50	XLON	xeaNjjFquaw
03-10-2025	14:02:04	GBp	305	563.00	XLON	xeaNjjFquWT
03-10-2025	14:01:14	GBp	40	563.00	XLON	xeaNjjFquVa
03-10-2025	13:29:20	GBp	72	562.00	XLON	xeaNjjFqQuX
03-10-2025	13:29:20	GBp	76	562.00	XLON	xeaNjjFqQvT
03-10-2025	13:29:20	GBp	30	562.00	XLON	xeaNjjFqQvV
03-10-2025	13:26:50	GBp	190	562.00	XLON	xeaNjjFqOna
03-10-2025	13:26:50	GBp	89	562.00	XLON	xeaNjjFqOnY
03-10-2025	13:24:20	GBp	212	562.00	XLON	xeaNjjFq6ia
03-10-2025	13:21:55	GBp	94	562.00	XLON	xeaNjjFq7Ps
03-10-2025	13:21:55	GBp	91	562.00	XLON	xeaNjjFq7Pu
03-10-2025	13:21:50	GBp	71	562.00	XLON	xeaNjjFq7Q0
03-10-2025	13:21:50	GBp	107	562.00	XLON	xeaNjjFq7Q2
03-10-2025	13:20:10	GBp	119	562.00	XLON	xeaNjjFq5X0
03-10-2025	13:18:10	GBp	86	562.00	XLON	xeaNjjFq24y
03-10-2025	13:18:10	GBp	406	562.00	XLON	xeaNjjFq24G
03-10-2025	13:18:05	GBp	3	562.00	XLON	xeaNjjFq29c
03-10-2025	13:18:05	GBp	3	562.00	XLON	xeaNjjFq29e
03-10-2025	13:17:35	GBp	44	562.00	XLON	xeaNjjFq3XV
03-10-2025	12:57:34	GBp	630	560.50	XLON	xeaNjjFrrRj
03-10-2025	12:53:09	GBp	565	561.00	XLON	xeaNjjFrmJq
03-10-2025	12:53:09	GBp	422	560.50	XLON	xeaNjjFrmJy
03-10-2025	12:18:40	GBp	268	561.00	XLON	xeaNjjFrM7g
03-10-2025	12:13:25	GBp	352	561.50	XLON	xeaNjjFrIut
03-10-2025	12:04:28	GBp	471	561.00	XLON	xeaNjjFrTel
03-10-2025	12:04:28	GBp	673	561.50	XLON	xeaNjjFrTen
03-10-2025	11:51:49	GBp	486	562.00	XLON	xeaNjjFr2CD
03-10-2025	11:48:09	GBp	250	563.00	XLON	xeaNjjFr1hJ
03-10-2025	11:48:09	GBp	508	563.00	XLON	xeaNjjFr1hL
03-10-2025	11:48:09	GBp	248	563.00	XLON	xeaNjjFr1hH
03-10-2025	11:48:09	GBp	209	563.00	XLON	xeaNjjFr1gn
03-10-2025	11:48:09	GBp	246	563.00	XLON	xeaNjjFr1gl
03-10-2025	11:48:09	GBp	293	563.00	XLON	xeaNjjFr1gd
03-10-2025	11:48:09	GBp	668	563.00	XLON	xeaNjjFr1gf
03-10-2025	11:48:09	GBp	67	563.00	XLON	xeaNjjFr1gh
03-10-2025	11:48:09	GBp	147	563.00	XLON	xeaNjjFr1gj
03-10-2025	11:48:09	GBp	363	563.00	XLON	xeaNjjFr1gA
03-10-2025	11:48:09	GBp	422	563.00	XLON	xeaNjjFr1gN
03-10-2025	11:48:09	GBp	292	562.50	XLON	xeaNjjFr1gL
03-10-2025	11:28:34	GBp	422	563.50	XLON	xeaNjjFsrM6
03-10-2025	11:13:36	GBp	36	562.00	XLON	xeaNjjFsxge
03-10-2025	11:13:36	GBp	256	562.00	XLON	xeaNjjFsxgg
03-10-2025	11:13:36	GBp	422	562.50	XLON	xeaNjjFsxgi
03-10-2025	11:11:03	GBp	13	562.50	XLON	xeaNjjFsuND
03-10-2025	11:11:03	GBp	39	562.50	XLON	xeaNjjFsuNF
03-10-2025	10:38:36	GBp	1,246	562.50	XLON	xeaNjjFsJiZ
03-10-2025	10:38:36	GBp	186	562.50	XLON	xeaNjjFsJib
03-10-2025	10:38:36	GBp	127	562.50	XLON	xeaNjjFsJid
03-10-2025	10:38:36	GBp	473	562.50	XLON	xeaNjjFsJip
03-10-2025	10:38:36	GBp	292	562.00	XLON	xeaNjjFsJis
03-10-2025	10:38:27	GBp	292	562.50	XLON	xeaNjjFsJr1
03-10-2025	10:38:27	GBp	422	563.00	XLON	xeaNjjFsJr3
03-10-2025	10:00:34	GBp	146	563.00	XLON	xeaNjjFsB2g
03-10-2025	10:00:34	GBp	219	563.00	XLON	xeaNjjFsB2k
03-10-2025	10:00:34	GBp	292	562.50	XLON	xeaNjjFsB2s
03-10-2025	10:00:34	GBp	236	563.00	XLON	xeaNjjFsB2u
03-10-2025	10:00:34	GBp	186	563.00	XLON	xeaNjjFsB2w
03-10-2025	09:45:19	GBp	45	563.00	XLON	xeaNjjFt@SG
03-10-2025	09:45:19	GBp	45	563.00	XLON	xeaNjjFt@SI
03-10-2025	09:29:20	GBp	148	563.50	XLON	xeaNjjFtYyQ
03-10-2025	09:26:30	GBp	255	563.50	XLON	xeaNjjFtWgy
03-10-2025	09:26:30	GBp	26	563.50	XLON	xeaNjjFtWg@
03-10-2025	09:08:42	GBp	423	561.00	XLON	xeaNjjFtLzI
03-10-2025	09:08:17	GBp	510	561.50	XLON	xeaNjjFtLCG
03-10-2025	09:06:36	GBp	292	562.00	XLON	xeaNjjFtITs
03-10-2025	09:06:35	GBp	422	562.50	XLON	xeaNjjFtIT3
03-10-2025	09:06:00	GBp	178	563.00	XLON	xeaNjjFtJoH
03-10-2025	09:06:00	GBp	1,416	563.00	XLON	xeaNjjFtJoQ
03-10-2025	09:05:54	GBp	422	563.00	XLON	xeaNjjFtJue
03-10-2025	08:50:05	GBp	422	563.00	XLON	xeaNjjFt6u0
03-10-2025	08:46:57	GBp	178	562.50	XLON	xeaNjjFt4Le
03-10-2025	08:46:57	GBp	1,089	562.50	XLON	xeaNjjFt4Lk
03-10-2025	08:30:52	GBp	280	562.00	XLON	xeaNjjFt8o5
03-10-2025	08:30:52	GBp	278	562.00	XLON	xeaNjjFt8y1
03-10-2025	08:28:34	GBp	171	562.00	XLON	xeaNjjFmsrJ
03-10-2025	08:28:34	GBp	493	562.00	XLON	xeaNjjFmsrL
03-10-2025	08:24:47	GBp	483	562.50	XLON	xeaNjjFmrh2
03-10-2025	08:24:47	GBp	250	562.50	XLON	xeaNjjFmrh4
03-10-2025	08:24:47	GBp	700	562.50	XLON	xeaNjjFmrh6
03-10-2025	08:24:47	GBp	250	562.00	XLON	xeaNjjFmrh8
03-10-2025	08:24:47	GBp	186	562.00	XLON	xeaNjjFmrhA
03-10-2025	08:24:47	GBp	133	561.50	XLON	xeaNjjFmrhG
03-10-2025	08:24:47	GBp	159	561.50	XLON	xeaNjjFmrhI
03-10-2025	08:24:47	GBp	352	562.00	XLON	xeaNjjFmrhK
03-10-2025	08:24:46	GBp	340	562.50	XLON	xeaNjjFmrgl
03-10-2025	08:24:46	GBp	82	562.50	XLON	xeaNjjFmrgn