REG-Transaction in own shares

OsbAnnouncement

Today 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
15 September 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 12 September 2025 it had purchased a total of
9,087 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                      -                      -         9,087     
 Highest price paid (per ordinary share)                  -                      -         552.00p   
 Lowest price paid (per ordinary share)                   -                      -         551.00p   
 Volume weighted average price paid (per ordinary share)  -                      -         551.72p   

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 360,934,499 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 360,934,499.

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  
 12-09-2025        16:25:28    GBp       132     552.00  CHIX           xeaNgxTOj77     
 12-09-2025        16:25:18    GBp       103     552.00  CHIX           xeaNgxTOj9R     
 12-09-2025        16:25:15    GBp       500     552.00  CHIX           xeaNgxTOjLF     
 12-09-2025        16:25:07    GBp       133     552.00  CHIX           xeaNgxTOjPE     
 12-09-2025        16:24:43    GBp       40      552.00  CHIX           xeaNgxTOg$l     
 12-09-2025        16:20:38    GBp       15      551.50  CHIX           xeaNgxTON5z     
 12-09-2025        16:20:11    GBp       168     551.50  CHIX           xeaNgxTONOs     
 12-09-2025        16:20:11    GBp       133     551.50  CHIX           xeaNgxTONO4     
 12-09-2025        16:20:01    GBp       744     552.00  CHIX           xeaNgxTOKeS     
 12-09-2025        16:14:53    GBp       109     551.00  CHIX           xeaNgxTOU3X     
 12-09-2025        16:14:52    GBp       101     551.00  CHIX           xeaNgxTOU3O     
 12-09-2025        16:14:51    GBp       164     551.00  CHIX           xeaNgxTOU2E     
 12-09-2025        16:14:48    GBp       976     551.00  CHIX           xeaNgxTOUCb     
 12-09-2025        16:09:20    GBp       142     551.50  CHIX           xeaNgxTOPZ6     
 12-09-2025        16:09:20    GBp       709     551.50  CHIX           xeaNgxTOPZ8     
 12-09-2025        16:07:25    GBp       338     551.50  CHIX           xeaNgxTO7gW     
 12-09-2025        16:07:13    GBp       1       551.50  CHIX           xeaNgxTO7vk     
 12-09-2025        16:07:12    GBp       135     551.50  CHIX           xeaNgxTO7vA     
 12-09-2025        15:57:55    GBp       8       552.00  CHIX           xeaNgxTOCIx     
 12-09-2025        15:57:55    GBp       373     552.00  CHIX           xeaNgxTOCIz     
 12-09-2025        15:57:48    GBp       720     552.00  CHIX           xeaNgxTOCPq     
 12-09-2025        15:34:34    GBp       373     551.50  CHIX           xeaNgxTPZtw     
 12-09-2025        15:28:45    GBp       380     551.50  CHIX           xeaNgxTPhie     
 12-09-2025        15:28:45    GBp       208     552.00  CHIX           xeaNgxTPhil     
 12-09-2025        15:28:45    GBp       338     552.00  CHIX           xeaNgxTPhin     
 12-09-2025        15:25:17    GBp       306     552.00  CHIX           xeaNgxTPNMv     
 12-09-2025        14:54:19    GBp       56      552.00  CHIX           xeaNgxTQw9s     
 12-09-2025        13:56:36    GBp       234     552.00  CHIX           xeaNgxTRkay     
 12-09-2025        13:56:28    GBp       335     552.00  CHIX           xeaNgxTRklY     
 12-09-2025        13:33:41    GBp       777     552.00  CHIX           xeaNgxTRP3D     
 12-09-2025        13:24:44    GBp       336     552.00  CHIX           xeaNgxTRF5G