REG-Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
27 April 2026

LEI number: 213800ZBKL9BHSL2K459

OSB GROUP PLC (the “Company”) 
Share Buyback Programme – Transactions in Own Shares

The Company announces that, for the period from 20 April 2026 to 24 April
2026, inclusive, it had purchased a total of 760,388 of its ordinary shares of
£0.01 each (the "ordinary shares") on the London Stock Exchange, CBOE BXE
,CBOE CXE and Aquis Exchange, through the Company’s broker Jefferies
International Limited as detailed below. The repurchased ordinary shares will
be cancelled.

 20 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      61,434                 53,807    14,745    7,025           
 Highest price paid (per ordinary share)                  566.00p                566.00p   566.00p   566.00p         
 Lowest price paid (per ordinary share)                   559.00p                560.50p   560.00p   560.50p         
 Volume weighted average price paid (per ordinary share)  562.97p                562.99p   563.02p   562.99p         



 21 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      58,126                 58,755    13,944    6,775           
 Highest price paid (per ordinary share)                  569.50p                570.00p   570.00p   569.50p         
 Lowest price paid (per ordinary share)                   561.00p                561.00p   561.00p   561.00p         
 Volume weighted average price paid (per ordinary share)  566.69p                566.72p   566.70p   566.82p         



 22 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      62,290                 62,985    14,943    7,283           
 Highest price paid (per ordinary share)                  563.00p                562.50p   563.00p   562.50p         
 Lowest price paid (per ordinary share)                   554.50p                554.50p   554.50p   554.50p         
 Volume weighted average price paid (per ordinary share)  557.94p                557.94p   557.97p   557.93p         



 23 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      64,377                 72,519    17,611    8,260           
 Highest price paid (per ordinary share)                  555.00p                553.00p   553.00p   552.50p         
 Lowest price paid (per ordinary share)                   545.00p                545.00p   545.00p   545.00p         
 Volume weighted average price paid (per ordinary share)  548.18p                548.16p   548.19p   548.16p         



 24 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      69,196                 78,180    19,152    8,981           
 Highest price paid (per ordinary share)                  544.50p                545.00p   545.50p   545.50p         
 Lowest price paid (per ordinary share)                   536.50p                536.00p   536.00p   536.00p         
 Volume weighted average price paid (per ordinary share)  539.40p                539.43p   539.40p   539.31p         

The purchases form part of the Company's share buyback programme announced on
5 March 2026.

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 349,555,204 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 349,555,204.

In accordance with Article 5(2)(b) of Regulation (EU) No 596/2024 as
incorporated into and implemented under English law (including by virtue of
the European Union (Withdrawal) Act 2028), the detailed breakdown of
individual trades made by Jefferies International 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

 Issuer Name        OSB GROUP PLC                    
 LEI                223800ZBKL9BHSL2K459             
 ISIN               GB00BLDRH360                     
 Intermediary Name  Jefferies International Limited  
 Intermediary Code  JEFFGB2XXXX                      
 Timezone           GMT                              
 Currency           GBP                              

Individual Transactions:

Please see attached PDF for full list of transactions.

Attachment
*     2026.04.24_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/ec1b997d-7278-48ed-8515-1d42c9f52bbd)