REG-Transaction in own shares

OsbAnnouncement

12/09/2025 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
12 September 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 11 September 2025 it had purchased a total of
7,899 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                      7,899                  -         -         
 Highest price paid (per ordinary share)                  542.00p                -         -         
 Lowest price paid (per ordinary share)                   540.00p                -         -         
 Volume weighted average price paid (per ordinary share)  541.62p                -         -         

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 360,943,586 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 360,943,586.

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  
 11-09-2025        11:48:57    GBp       274     542.00  XLON           xeaNgr9kOFW     
 11-09-2025        11:47:44    GBp       210     542.00  XLON           xeaNgr9kPud     
 11-09-2025        11:47:43    GBp       148     542.00  XLON           xeaNgr9kPuI     
 11-09-2025        11:47:43    GBp       941     542.00  XLON           xeaNgr9kPuR     
 11-09-2025        11:27:41    GBp       446     542.00  XLON           xeaNgr9kBwR     
 11-09-2025        11:09:35    GBp       834     542.00  XLON           xeaNgr9lylp     
 11-09-2025        10:50:47    GBp       501     542.00  XLON           xeaNgr9lXFj     
 11-09-2025        10:45:56    GBp       501     541.50  XLON           xeaNgr9liMc     
 11-09-2025        10:45:46    GBp       501     542.00  XLON           xeaNgr9liSw     
 11-09-2025        08:28:30    GBp       501     542.00  XLON           xeaNgr9fsze     
 11-09-2025        08:14:44    GBp       539     541.50  XLON           xeaNgr9f$lq     
 11-09-2025        08:14:43    GBp       25      541.50  XLON           xeaNgr9f$l@     
 11-09-2025        08:14:43    GBp       266     541.50  XLON           xeaNgr9f$l0     
 11-09-2025        08:05:03    GBp       215     540.00  XLON           xeaNgr9fuS8     
 11-09-2025        08:05:03    GBp       215     540.00  XLON           xeaNgr9fuSA     
 11-09-2025        08:04:59    GBp       291     540.50  XLON           xeaNgr9fuOl     
 11-09-2025        08:04:59    GBp       56      540.50  XLON           xeaNgr9fuOn     
 11-09-2025        08:02:54    GBp       437     541.00  XLON           xeaNgr9fdgR     
 11-09-2025        08:02:54    GBp       998     541.50  XLON           xeaNgr9fdgT