REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
30 March 2026

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that, for the period from 23 March 2026 to 27 March
2026, inclusive, it had purchased a total of 839,507 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.

 23 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      90,812                 67,669    27,226    10,791          
 Highest price paid (per ordinary share)                  540.50p                540.50p   540.50p   540.50p         
 Lowest price paid (per ordinary share)                   518.00p                518.00p   518.00p   518.00p         
 Volume weighted average price paid (per ordinary share)  535.00p                534.89p   535.13p   535.03p         



 24 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      88,741                 64,280    22,928    9,942           
 Highest price paid (per ordinary share)                  542.50p                542.50p   542.50p   542.50p         
 Lowest price paid (per ordinary share)                   536.00p                536.00p   536.00p   536.00p         
 Volume weighted average price paid (per ordinary share)  540.31p                540.29p   540.32p   540.32p         



 25 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      0                      0         0         0               
 Highest price paid (per ordinary share)                  0.00p                  0.00p     0.00p     0.00p           
 Lowest price paid (per ordinary share)                   0.00p                  0.00p     0.00p     0.00p           
 Volume weighted average price paid (per ordinary share)  0.00p                  0.00p     0.00p     0.00p           



 26 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      94,404                 70,194    24,608    10,698          
 Highest price paid (per ordinary share)                  533.50p                532.50p   532.00p   532.50p         
 Lowest price paid (per ordinary share)                   518.50p                518.50p   518.50p   519.00p         
 Volume weighted average price paid (per ordinary share)  526.28p                526.32p   526.29p   526.34p         



 27 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      119,494                91,486    31,827    14,407          
 Highest price paid (per ordinary share)                  524.00p                524.00p   524.00p   523.50p         
 Lowest price paid (per ordinary share)                   514.00p                514.00p   514.00p   514.00p         
 Volume weighted average price paid (per ordinary share)  519.18p                519.17p   519.17p   519.18p         

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 352,294,428 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 352,294,428.

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
*     2026.03.27_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/7c8bd96e-e899-4c28-8d5a-9a04c86691bc)