REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
13 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 07 April 2026 to 10 April
2026, inclusive, it had purchased a total of 494,210 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.

 07 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      96,541                 76,852    25,525    12,320          
 Highest price paid (per ordinary share)                  525.50p                525.50p   525.50p   525.50p         
 Lowest price paid (per ordinary share)                   516.00p                516.00p   516.00p   516.00p         
 Volume weighted average price paid (per ordinary share)  522.53p                522.54p   522.55p   522.49p         



 08 April 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           



 09 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      72,653                 59,014    17,496    8,030           
 Highest price paid (per ordinary share)                  542.00p                541.50p   541.50p   541.50p         
 Lowest price paid (per ordinary share)                   535.00p                535.00p   535.00p   535.00p         
 Volume weighted average price paid (per ordinary share)  538.33p                538.32p   538.39p   538.43p         



 10 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      58,118                 47,292    14,120    6,249           
 Highest price paid (per ordinary share)                  549.50p                549.50p   549.50p   549.50p         
 Lowest price paid (per ordinary share)                   544.00p                543.50p   544.00p   544.00p         
 Volume weighted average price paid (per ordinary share)  547.76p                547.75p   547.72p   547.76p         

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 351,021,667 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 351,021,667.

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
*     2026.04.10_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/ba16db27-e206-4468-ab59-97a42f2b680f)