REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

Today 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
15 December 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 12 December 2025 it had purchased a total of
20,000 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                      20,000                 -         -         
 Highest price paid (per ordinary share)                  595.00p                -         -         
 Lowest price paid (per ordinary share)                   588.50p                -         -         
 Volume weighted average price paid (per ordinary share)  591.39p                -         -         

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 356,615,645 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 356,615,645.

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  
 12-12-2025        16:26:51    GBp       343     589.50  XLON           xeaMOzE5C86     
 12-12-2025        16:20:32    GBp       346     589.50  XLON           xeaMOzE6roF     
 12-12-2025        16:18:27    GBp       631     589.50  XLON           xeaMOzE6pOo     
 12-12-2025        16:11:46    GBp       68      589.50  XLON           xeaMOzE6xvn     
 12-12-2025        16:11:40    GBp       671     590.00  XLON           xeaMOzE6x5u     
 12-12-2025        15:58:23    GBp       293     589.50  XLON           xeaMOzE6haT     
 12-12-2025        15:50:40    GBp       261     589.00  XLON           xeaMOzE6J26     
 12-12-2025        15:50:40    GBp       137     589.00  XLON           xeaMOzE6J28     
 12-12-2025        15:50:39    GBp       416     589.00  XLON           xeaMOzE6JD4     
 12-12-2025        15:50:39    GBp       91      589.00  XLON           xeaMOzE6JD9     
 12-12-2025        15:43:04    GBp       279     589.50  XLON           xeaMOzE6Pg4     
 12-12-2025        15:38:55    GBp       301     589.50  XLON           xeaMOzE65UX     
 12-12-2025        15:21:22    GBp       423     590.50  XLON           xeaMOzE7m4c     
 12-12-2025        15:21:22    GBp       370     590.00  XLON           xeaMOzE7m4g     
 12-12-2025        15:21:22    GBp       531     590.50  XLON           xeaMOzE7m4n     
 12-12-2025        15:07:00    GBp       2       591.50  XLON           xeaMOzE7Z87     
 12-12-2025        15:07:00    GBp       378     591.50  XLON           xeaMOzE7Z89     
 12-12-2025        15:06:49    GBp       547     592.00  XLON           xeaMOzE7ZT4     
 12-12-2025        15:00:12    GBp       646     592.00  XLON           xeaMOzE7hZs     
 12-12-2025        14:43:18    GBp       234     592.00  XLON           xeaMOzE77kb     
 12-12-2025        14:43:03    GBp       336     592.50  XLON           xeaMOzE77wO     
 12-12-2025        14:43:00    GBp       534     593.00  XLON           xeaMOzE777E     
 12-12-2025        14:43:00    GBp       110     593.00  XLON           xeaMOzE777G     
 12-12-2025        14:24:06    GBp       408     591.50  XLON           xeaMOzE0$L7     
 12-12-2025        14:24:02    GBp       456     592.00  XLON           xeaMOzE0$J6     
 12-12-2025        14:08:11    GBp       23      591.50  XLON           xeaMOzE0XDy     
 12-12-2025        14:08:05    GBp       92      591.50  XLON           xeaMOzE0XNL     
 12-12-2025        13:57:44    GBp       259     591.00  XLON           xeaMOzE0KtI     
 12-12-2025        13:50:01    GBp       404     591.00  XLON           xeaMOzE0Vcw     
 12-12-2025        13:44:23    GBp       3       591.00  XLON           xeaMOzE0Odf     
 12-12-2025        13:36:21    GBp       219     592.50  XLON           xeaMOzE02qJ     
 12-12-2025        13:29:54    GBp       452     593.50  XLON           xeaMOzE0FSk     
 12-12-2025        13:13:57    GBp       336     594.00  XLON           xeaMOzE1mXH     
 12-12-2025        13:00:59    GBp       100     593.00  XLON           xeaMOzE1cZm     
 12-12-2025        13:00:59    GBp       341     593.00  XLON           xeaMOzE1cZo     
 12-12-2025        12:52:23    GBp       290     593.50  XLON           xeaMOzE1WRK     
 12-12-2025        12:51:03    GBp       633     594.00  XLON           xeaMOzE1XOx     
 12-12-2025        12:07:10    GBp       114     593.50  XLON           xeaMOzE1303     
 12-12-2025        12:07:10    GBp       83      593.50  XLON           xeaMOzE1305     
 12-12-2025        12:02:14    GBp       366     594.00  XLON           xeaMOzE1EQF     
 12-12-2025        11:47:51    GBp       215     593.50  XLON           xeaMOzE2qxZ     
 12-12-2025        11:46:39    GBp       341     594.00  XLON           xeaMOzE2rY3     
 12-12-2025        11:25:55    GBp       244     595.00  XLON           xeaMOzE2cOj     
 12-12-2025        11:22:41    GBp       340     594.50  XLON           xeaMOzE2bZ2     
 12-12-2025        11:12:49    GBp       258     595.00  XLON           xeaMOzE2ild     
 12-12-2025        11:11:49    GBp       699     594.50  XLON           xeaMOzE2iGN     
 12-12-2025        10:24:53    GBp       353     589.00  XLON           xeaMOzE2DNo     
 12-12-2025        10:19:10    GBp       37      589.00  XLON           xeaMOzE29uz     
 12-12-2025        10:18:22    GBp       279     588.50  XLON           xeaMOzE3sZE     
 12-12-2025        09:59:50    GBp       313     589.00  XLON           xeaMOzE3xAo     
 12-12-2025        09:59:50    GBp       450     589.50  XLON           xeaMOzE3xAq     
 12-12-2025        09:30:57    GBp       233     589.50  XLON           xeaMOzE3NFq     
 12-12-2025        09:23:34    GBp       210     589.50  XLON           xeaMOzE3GO2     
 12-12-2025        09:22:41    GBp       182     589.50  XLON           xeaMOzE3HuP     
 12-12-2025        09:22:41    GBp       115     589.50  XLON           xeaMOzE3HuR     
 12-12-2025        09:06:14    GBp       416     589.50  XLON           xeaMOzE35RJ     
 12-12-2025        08:54:07    GBp       18      589.50  XLON           xeaMOzE3AEs     
 12-12-2025        08:54:07    GBp       67      589.50  XLON           xeaMOzE3AEu     
 12-12-2025        08:54:07    GBp       111     589.50  XLON           xeaMOzE3AEw     
 12-12-2025        08:46:11    GBp       217     591.00  XLON           xeaMOzEyqns     
 12-12-2025        08:46:11    GBp       312     591.50  XLON           xeaMOzEyqnu     
 12-12-2025        08:46:11    GBp       764     592.00  XLON           xeaMOzEyqn4     
 12-12-2025        08:09:17    GBp       265     591.50  XLON           xeaMOzEyflu     
 12-12-2025        08:08:28    GBp       380     591.50  XLON           xeaMOzEyfDR     
 12-12-2025        08:02:17    GBp       126     589.50  XLON           xeaMOzEyId8     
 12-12-2025        08:01:40    GBp       528     590.00  XLON           xeaMOzEyIAL