REG-Transaction in Own Shares

OsbAnnouncement

Today 07:00

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OSB GROUP PLC
ISIN: GB00BLDRH360
1 June 2026

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that, for the period from 26 May 2026 to 29 May 2026,
inclusive, it had purchased a total of 705,468 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.

 26 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      89,134                 96,279    28,078    12,970          
 Highest price paid (per ordinary share)                  512.00p                512.50p   512.50p   512.00p         
 Lowest price paid (per ordinary share)                   506.00p                506.50p   507.50p   508.50p         
 Volume weighted average price paid (per ordinary share)  510.94p                510.87p   510.91p   510.82p         



 27 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      75,774                 80,315    23,968    11,215          
 Highest price paid (per ordinary share)                  521.00p                521.00p   521.00p   521.00p         
 Lowest price paid (per ordinary share)                   512.50p                514.50p   515.00p   516.00p         
 Volume weighted average price paid (per ordinary share)  517.87p                517.95p   517.90p   518.02p         



 28 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      70,938                 75,327    22,455    10,514          
 Highest price paid (per ordinary share)                  516.00p                516.00p   515.50p   515.00p         
 Lowest price paid (per ordinary share)                   508.00p                507.00p   507.50p   507.00p         
 Volume weighted average price paid (per ordinary share)  510.79p                510.81p   510.81p   510.75p         



 29 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      41,738                 46,902    13,661    6,200           
 Highest price paid (per ordinary share)                  519.50p                519.50p   519.50p   519.50p         
 Lowest price paid (per ordinary share)                   514.50p                514.50p   514.50p   514.00p         
 Volume weighted average price paid (per ordinary share)  517.61p                517.58p   517.56p   517.58p         

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 343,843,598 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 343,843,598.

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
*     2026.05.29_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/b628b4f8-6c8d-442e-ad0d-94113ff48c98)