REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
23 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 16 March 2026 to 20 March
2026, inclusive, it had purchased a total of 766,385 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.

 16 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      62,407                 50,401    20,996    7,793           
 Highest price paid (per ordinary share)                  569.00p                569.00p   569.00p   569.00p         
 Lowest price paid (per ordinary share)                   561.50p                561.50p   561.50p   561.50p         
 Volume weighted average price paid (per ordinary share)  566.02p                566.06p   566.00p   566.09p         



 17 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      50,308                 25,699    14,674    6,697           
 Highest price paid (per ordinary share)                  564.50p                564.50p   564.50p   564.50p         
 Lowest price paid (per ordinary share)                   560.50p                560.50p   561.50p   560.50p         
 Volume weighted average price paid (per ordinary share)  564.15p                563.97p   564.12p   564.18p         



 18 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      64,597                 51,437    21,301    8,033           
 Highest price paid (per ordinary share)                  568.50p                568.50p   568.50p   568.50p         
 Lowest price paid (per ordinary share)                   562.00p                562.00p   562.00p   562.00p         
 Volume weighted average price paid (per ordinary share)  566.17p                566.16p   566.16p   566.20p         



 19 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      82,156                 63,329    25,456    9,667           
 Highest price paid (per ordinary share)                  560.00p                559.00p   559.50p   559.50p         
 Lowest price paid (per ordinary share)                   540.50p                540.50p   541.00p   541.50p         
 Volume weighted average price paid (per ordinary share)  547.56p                547.59p   547.57p   547.60p         



 20 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      92,683                 69,660    28,022    11,069          
 Highest price paid (per ordinary share)                  549.00p                549.00p   549.00p   549.00p         
 Lowest price paid (per ordinary share)                   535.00p                535.00p   535.00p   535.00p         
 Volume weighted average price paid (per ordinary share)  541.99p                541.95p   541.95p   541.99p         

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 353,128,078 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 353,128,078.

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
*     2026.03.20_OSBG Buyback Fills compressed
(https://ml-eu.globenewswire.com/Resource/Download/93c746cc-a816-4ebd-bd3d-eb17ab0aaa9a)