REG-Transaction in own shares

OsbAnnouncement

Yesterday 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
30 June 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 27 June 2025 it had purchased a total of 10,671
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                      10,671                 -         -         
 Highest price paid (per ordinary share)                  518.00p                -         -         
 Lowest price paid (per ordinary share)                   514.50p                -         -         
 Volume weighted average price paid (per ordinary share)  516.42p                -         -         

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 364,957,369 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 364,957,369.

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  
 27-06-2025        13:49:22    GBp       283     518.00  XLON           xHaN@kexxvW     
 27-06-2025        11:25:52    GBp       243     517.00  XLON           xHaN@keqBk$     
 27-06-2025        11:20:29    GBp       194     517.50  XLON           xHaN@kerteH     
 27-06-2025        11:13:10    GBp       250     518.00  XLON           xHaN@kermFB     
 27-06-2025        11:08:05    GBp       229     517.00  XLON           xHaN@kerz2S     
 27-06-2025        11:08:05    GBp       236     517.50  XLON           xHaN@kerzEG     
 27-06-2025        11:02:55    GBp       455     515.50  XLON           xHaN@kercU3     
 27-06-2025        10:51:42    GBp       479     515.00  XLON           xHaN@keriXC     
 27-06-2025        10:51:38    GBp       314     515.50  XLON           xHaN@keriZ3     
 27-06-2025        10:26:14    GBp       294     515.50  XLON           xHaN@kerR6K     
 27-06-2025        10:19:07    GBp       167     516.00  XLON           xHaN@ker4U3     
 27-06-2025        10:15:24    GBp       212     516.50  XLON           xHaN@ker3Ll     
 27-06-2025        10:10:43    GBp       275     517.00  XLON           xHaN@kerFvq     
 27-06-2025        10:03:14    GBp       193     517.50  XLON           xHaN@ker9LM     
 27-06-2025        10:03:14    GBp       259     517.50  XLON           xHaN@ker9LV     
 27-06-2025        09:56:15    GBp       192     517.50  XLON           xHaN@kesmYf     
 27-06-2025        09:49:00    GBp       301     517.00  XLON           xHaN@keswxD     
 27-06-2025        09:48:31    GBp       411     517.00  XLON           xHaN@keswP$     
 27-06-2025        09:36:50    GBp       287     516.50  XLON           xHaN@kesXtd     
 27-06-2025        09:30:02    GBp       218     516.50  XLON           xHaN@kesgDH     
 27-06-2025        09:28:31    GBp       74      516.00  XLON           xHaN@keshHf     
 27-06-2025        09:28:31    GBp       62      516.00  XLON           xHaN@keshHg     
 27-06-2025        09:28:31    GBp       174     516.00  XLON           xHaN@keshHi     
 27-06-2025        09:18:01    GBp       237     516.00  XLON           xHaN@kesGnY     
 27-06-2025        09:15:20    GBp       341     516.50  XLON           xHaN@kesUo5     
 27-06-2025        09:11:23    GBp       563     517.00  XLON           xHaN@kesTUP     
 27-06-2025        09:08:14    GBp       161     517.00  XLON           xHaN@kesOMU     
 27-06-2025        09:03:56    GBp       233     516.50  XLON           xHaN@kes4vk     
 27-06-2025        08:45:00    GBp       188     515.50  XLON           xHaN@ketqdm     
 27-06-2025        08:40:24    GBp       203     514.50  XLON           xHaN@ketmfC     
 27-06-2025        08:40:24    GBp       335     514.50  XLON           xHaN@ketmfJ     
 27-06-2025        08:35:49    GBp       346     515.00  XLON           xHaN@ketyNa     
 27-06-2025        08:24:07    GBp       216     515.00  XLON           xHaN@ketWnT     
 27-06-2025        08:22:51    GBp       229     515.00  XLON           xHaN@ketX7w     
 27-06-2025        08:16:43    GBp       156     515.00  XLON           xHaN@kethp@     
 27-06-2025        08:16:43    GBp       16      515.00  XLON           xHaN@kethp0     
 27-06-2025        08:16:01    GBp       225     515.00  XLON           xHaN@kethKP     
 27-06-2025        08:10:31    GBp       265     516.50  XLON           xHaN@ketKw7     
 27-06-2025        08:06:03    GBp       312     517.50  XLON           xHaN@ketG5M     
 27-06-2025        08:03:35    GBp       343     517.50  XLON           xHaN@ketVzt     
 27-06-2025        08:03:35    GBp       500     518.00  XLON           xHaN@ketVzv