REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
07 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 30 March 2026 to 02 April
2026, inclusive, it had purchased a total of 779,345 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.

 30 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      117,921                90,281    31,419    14,216          
 Highest price paid (per ordinary share)                  518.00p                518.00p   518.00p   518.00p         
 Lowest price paid (per ordinary share)                   509.50p                509.50p   509.50p   509.50p         
 Volume weighted average price paid (per ordinary share)  513.95p                514.00p   513.93p   514.07p         



 31 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      99,093                 80,222    27,042    12,288          
 Highest price paid (per ordinary share)                  528.00p                528.50p   528.00p   528.00p         
 Lowest price paid (per ordinary share)                   521.50p                521.50p   521.50p   521.50p         
 Volume weighted average price paid (per ordinary share)  525.14p                525.14p   525.17p   525.17p         



 01 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      40,949                 32,994    10,778    5,057           
 Highest price paid (per ordinary share)                  546.50p                546.50p   545.50p   546.50p         
 Lowest price paid (per ordinary share)                   537.00p                538.50p   538.50p   538.50p         
 Volume weighted average price paid (per ordinary share)  542.60p                542.59p   542.73p   542.60p         



 02 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      99,131                 79,047    26,247    12,660          
 Highest price paid (per ordinary share)                  517.50p                517.00p   517.00p   517.00p         
 Lowest price paid (per ordinary share)                   505.00p                505.00p   505.50p   505.00p         
 Volume weighted average price paid (per ordinary share)  511.35p                511.37p   511.34p   511.37p         

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 351,515,083 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 351,515,083.

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
*     2026.04.02_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/ccf81890-03e0-4306-b785-fa8a42b21589)