REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
16 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 09 March 2026 to 13 March
2026, inclusive, it had purchased a total of 718,201 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.

 09 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      68,169                 57,183    23,802    9,354           
 Highest price paid (per ordinary share)                  568.50p                568.50p   568.50p   568.00p         
 Lowest price paid (per ordinary share)                   550.00p                550.00p   550.00p   550.00p         
 Volume weighted average price paid (per ordinary share)  563.63p                563.59p   563.61p   563.67p         



 10 March 2026                                            London Stock Exchange  CBOE BXE   CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      45,937                 38,406     15,998    6,337           
 Highest price paid (per ordinary share)                  588.50p                588.0000p  588.50p   588.00p         
 Lowest price paid (per ordinary share)                   577.00p                577.00p    576.50p   576.50p         
 Volume weighted average price paid (per ordinary share)  581.15p                581.13p    581.12p   581.22p         



 11 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      69,415                 55,527    23,456    9,055           
 Highest price paid (per ordinary share)                  578.50p                578.00p   578.00p   578.00p         
 Lowest price paid (per ordinary share)                   570.00p                569.50p   570.00p   571.00p         
 Volume weighted average price paid (per ordinary share)  573.42p                573.57p   573.45p   573.50p         



 12 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      62,173                 49,913    20,967    7,672           
 Highest price paid (per ordinary share)                  574.50p                574.50p   574.50p   574.00p         
 Lowest price paid (per ordinary share)                   565.00p                565.00p   565.00p   565.00p         
 Volume weighted average price paid (per ordinary share)  569.64p                569.72p   569.67p   569.67p         



 13 March 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      68,419                 54,908    23,068    8,442           
 Highest price paid (per ordinary share)                  570.50p                570.50p   570.50p   570.50p         
 Lowest price paid (per ordinary share)                   555.00p                556.00p   557.50p   560.00p         
 Volume weighted average price paid (per ordinary share)  566.96p                567.00p   567.08p   567.08p         

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 351,850,774 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 351,850,774.

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
*     2026.03.13_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/5b2efd7a-ad20-4fcb-a91a-624aa5c0ff6b)