REG-Transaction in own shares

OsbAnnouncement

15/08/2025 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
15 August 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 14 August 2025 it had purchased a total of
21,224 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                      21,224                 -         -         
 Highest price paid (per ordinary share)                  562.00p                -         -         
 Lowest price paid (per ordinary share)                   559.00p                -         -         
 Volume weighted average price paid (per ordinary share)  561.40p                -         -         

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 363,342,856 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 363,342,856.

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  
 14-08-2025        16:26:08    GBp       201     561.00  XLON           xHaNr67n$hZ     
 14-08-2025        16:26:08    GBp       332     561.50  XLON           xHaNr67n$hl     
 14-08-2025        16:19:00    GBp       143     561.50  XLON           xHaNr67ndUc     
 14-08-2025        16:18:56    GBp       815     561.50  XLON           xHaNr67nadf     
 14-08-2025        16:12:10    GBp       1,404   562.00  XLON           xHaNr67nlFe     
 14-08-2025        16:12:02    GBp       1,176   562.00  XLON           xHaNr67nlJO     
 14-08-2025        15:59:55    GBp       1,552   562.00  XLON           xHaNr67nSxg     
 14-08-2025        15:59:55    GBp       1,176   562.00  XLON           xHaNr67nSxt     
 14-08-2025        15:52:06    GBp       326     561.50  XLON           xHaNr67n2IH     
 14-08-2025        15:50:10    GBp       321     561.50  XLON           xHaNr67n10s     
 14-08-2025        15:46:55    GBp       355     561.50  XLON           xHaNr67nAJV     
 14-08-2025        15:46:33    GBp       140     561.50  XLON           xHaNr67nBv9     
 14-08-2025        15:46:33    GBp       1,125   561.50  XLON           xHaNr67nBvB     
 14-08-2025        15:46:33    GBp       1,268   561.50  XLON           xHaNr67nBvD     
 14-08-2025        15:46:33    GBp       218     561.50  XLON           xHaNr67nBvF     
 14-08-2025        15:45:14    GBp       1,176   561.00  XLON           xHaNr67n9xE     
 14-08-2025        15:20:09    GBp       207     559.00  XLON           xHaNr67oh9$     
 14-08-2025        15:20:03    GBp       345     559.50  XLON           xHaNr67ohTB     
 14-08-2025        15:20:00    GBp       346     560.00  XLON           xHaNr67ohON     
 14-08-2025        15:20:00    GBp       1,492   560.00  XLON           xHaNr67ohRh     
 14-08-2025        15:19:11    GBp       303     560.50  XLON           xHaNr67oeRO     
 14-08-2025        15:19:11    GBp       1,117   560.50  XLON           xHaNr67oeRQ     
 14-08-2025        15:07:59    GBp       575     561.00  XLON           xHaNr67oPyb     
 14-08-2025        15:07:59    GBp       249     561.00  XLON           xHaNr67oPyh     
 14-08-2025        15:02:51    GBp       262     561.50  XLON           xHaNr67o1dO     
 14-08-2025        15:00:35    GBp       474     562.00  XLON           xHaNr67oCAG     
 14-08-2025        15:00:35    GBp       350     562.00  XLON           xHaNr67oCLi     
 14-08-2025        15:00:35    GBp       440     562.00  XLON           xHaNr67oCLm     
 14-08-2025        14:58:17    GBp       124     562.00  XLON           xHaNr67o87A     
 14-08-2025        14:30:19    GBp       450     561.00  XLON           xHaNr67pGJN     
 14-08-2025        14:19:32    GBp       469     561.50  XLON           xHaNr67p5lR     
 14-08-2025        14:13:12    GBp       670     562.00  XLON           xHaNr67pCfj     
 14-08-2025        14:13:12    GBp       403     562.00  XLON           xHaNr67pCfx     
 14-08-2025        14:13:12    GBp       309     562.00  XLON           xHaNr67pCf9     
 14-08-2025        14:13:12    GBp       911     562.00  XLON           xHaNr67pCfB