REG-Transaction in own shares

OsbAnnouncement

24/09/2025 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
24 September 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 23 September 2025 it had purchased a total of
17,683 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                      17,683                 -         -         
 Highest price paid (per ordinary share)                  551.00p                -         -         
 Lowest price paid (per ordinary share)                   545.50p                -         -         
 Volume weighted average price paid (per ordinary share)  548.00p                -         -         

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 360,303,693 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 360,303,693.

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  
 23-09-2025        16:27:12    GBp       255     547.00  XLON           xeaNhF1ZuJX     
 23-09-2025        16:27:12    GBp       384     547.00  XLON           xeaNhF1ZuJZ     
 23-09-2025        16:16:48    GBp       747     546.50  XLON           xeaNhF1ZgeS     
 23-09-2025        16:15:37    GBp       232     547.00  XLON           xeaNhF1Zh2L     
 23-09-2025        16:01:21    GBp       562     547.00  XLON           xeaNhF1ZRxC     
 23-09-2025        15:51:24    GBp       394     547.50  XLON           xeaNhF1ZFKG     
 23-09-2025        15:51:24    GBp       31      547.50  XLON           xeaNhF1ZFKI     
 23-09-2025        15:45:19    GBp       471     547.50  XLON           xeaNhF0Srh7     
 23-09-2025        15:42:56    GBp       818     547.00  XLON           xeaNhF0SmDH     
 23-09-2025        15:39:14    GBp       232     548.00  XLON           xeaNhF0SzTa     
 23-09-2025        15:35:18    GBp       171     548.00  XLON           xeaNhF0SdZP     
 23-09-2025        15:35:18    GBp       53      548.00  XLON           xeaNhF0SdZR     
 23-09-2025        15:31:22    GBp       219     548.00  XLON           xeaNhF0SZQ3     
 23-09-2025        15:04:27    GBp       431     547.50  XLON           xeaNhF0SAtb     
 23-09-2025        15:04:27    GBp       276     547.00  XLON           xeaNhF0SAtZ     
 23-09-2025        14:58:50    GBp       463     548.00  XLON           xeaNhF0TmUE     
 23-09-2025        14:44:00    GBp       32      548.00  XLON           xeaNhF0TeU$     
 23-09-2025        14:44:00    GBp       397     548.00  XLON           xeaNhF0TeUz     
 23-09-2025        14:43:36    GBp       291     548.50  XLON           xeaNhF0Tf6s     
 23-09-2025        14:43:36    GBp       99      548.50  XLON           xeaNhF0Tf6x     
 23-09-2025        14:43:36    GBp       225     548.50  XLON           xeaNhF0Tf6z     
 23-09-2025        14:26:18    GBp       392     547.00  XLON           xeaNhF0TCR@     
 23-09-2025        14:14:41    GBp       436     546.00  XLON           xeaNhF0U$I2     
 23-09-2025        14:08:00    GBp       357     546.50  XLON           xeaNhF0UdJK     
 23-09-2025        13:50:16    GBp       360     546.00  XLON           xeaNhF0UKOP     
 23-09-2025        13:45:09    GBp       295     546.50  XLON           xeaNhF0UUjH     
 23-09-2025        13:34:29    GBp       362     545.50  XLON           xeaNhF0U5Bc     
 23-09-2025        13:32:01    GBp       601     546.00  XLON           xeaNhF0U0mv     
 23-09-2025        13:12:01    GBp       697     546.00  XLON           xeaNhF0Vwbz     
 23-09-2025        12:48:50    GBp       1       545.50  XLON           xeaNhF0VMwI     
 23-09-2025        12:48:50    GBp       206     545.50  XLON           xeaNhF0VMwK     
 23-09-2025        12:33:23    GBp       297     545.50  XLON           xeaNhF0VO0E     
 23-09-2025        12:02:12    GBp       276     546.00  XLON           xeaNhF0OweQ     
 23-09-2025        11:46:54    GBp       455     546.00  XLON           xeaNhF0OisN     
 23-09-2025        11:25:33    GBp       305     546.50  XLON           xeaNhF0ORc0     
 23-09-2025        11:25:13    GBp       34      547.00  XLON           xeaNhF0ORtE     
 23-09-2025        11:25:13    GBp       319     547.00  XLON           xeaNhF0ORtG     
 23-09-2025        10:57:54    GBp       303     549.00  XLON           xeaNhF0PmWz     
 23-09-2025        10:45:02    GBp       402     550.00  XLON           xeaNhF0Pc1B     
 23-09-2025        10:38:00    GBp       416     550.50  XLON           xeaNhF0PWq$     
 23-09-2025        10:38:00    GBp       772     550.50  XLON           xeaNhF0PWqD     
 23-09-2025        10:32:51    GBp       258     551.00  XLON           xeaNhF0Pi1T     
 23-09-2025        10:32:51    GBp       51      551.00  XLON           xeaNhF0Pi1V     
 23-09-2025        09:25:07    GBp       388     550.00  XLON           xeaNhF0QaOi     
 23-09-2025        09:20:23    GBp       352     550.50  XLON           xeaNhF0QXze     
 23-09-2025        09:20:23    GBp       101     550.50  XLON           xeaNhF0QXzg     
 23-09-2025        09:12:46    GBp       738     551.00  XLON           xeaNhF0Qecq     
 23-09-2025        08:27:46    GBp       199     550.50  XLON           xeaNhF0Rn7q     
 23-09-2025        08:27:30    GBp       410     551.00  XLON           xeaNhF0RnEd     
 23-09-2025        08:04:15    GBp       459     550.50  XLON           xeaNhF0RMj4     
 23-09-2025        08:04:11    GBp       658     551.00  XLON           xeaNhF0RMg5