REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
11 May 2026

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that, for the period from 05 May 2026 to 08 May 2026,
inclusive, it had purchased a total of 950,009 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.

 05 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      96,511                 111,675   25,766    12,477          
 Highest price paid (per ordinary share)                  527.50p                527.50p   527.50p   527.00p         
 Lowest price paid (per ordinary share)                   514.50p                515.50p   515.00p   515.50p         
 Volume weighted average price paid (per ordinary share)  520.95p                520.95p   521.02p   520.92p         



 06 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      91,033                 110,571   25,019    12,168          
 Highest price paid (per ordinary share)                  528.50p                528.50p   528.50p   528.00p         
 Lowest price paid (per ordinary share)                   516.50p                516.50p   516.50p   516.50p         
 Volume weighted average price paid (per ordinary share)  521.23p                521.28p   521.25p   521.18p         



 07 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      96,545                 86,000    23,686    10,620          
 Highest price paid (per ordinary share)                  522.50p                523.00p   523.00p   522.50p         
 Lowest price paid (per ordinary share)                   515.50p                515.50p   515.50p   515.50p         
 Volume weighted average price paid (per ordinary share)  519.36p                520.13p   519.68p   519.91p         



 08 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      94,632                 112,916   26,720    13,670          
 Highest price paid (per ordinary share)                  520.00p                520.00p   520.00p   520.00p         
 Lowest price paid (per ordinary share)                   510.00p                510.50p   511.00p   511.00p         
 Volume weighted average price paid (per ordinary share)  516.67p                516.68p   516.68p   516.62p         

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 347,544,522 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 347,544,522.

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
*     2026.05.08_OSBG Buyback Fills v2
(https://ml-eu.globenewswire.com/Resource/Download/508334b2-3f5c-4a21-92b7-efa9ce1f1d33)