REG-OSB GROUP PLC - Transaction in Own Shares

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OSB GROUP PLC
ISIN: GB00BLDRH360
05 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 27 April 2026 to 01 May 2026,
inclusive, it had purchased a total of 1,060,756 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.

 27 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      72,237                 81,679    19,940    9,332           
 Highest price paid (per ordinary share)                  538.00p                538.00p   538.00p   538.00p         
 Lowest price paid (per ordinary share)                   531.00p                530.50p   530.50p   530.50p         
 Volume weighted average price paid (per ordinary share)  533.60p                533.57p   533.59p   533.51p         



 28 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      81,298                 94,032    21,392    10,203          
 Highest price paid (per ordinary share)                  522.00p                522.00p   522.00p   522.00p         
 Lowest price paid (per ordinary share)                   506.00p                504.50p   506.00p   508.00p         
 Volume weighted average price paid (per ordinary share)  516.52p                516.53p   516.64p   516.52p         



 29 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      116,907                125,112   30,001    14,251          
 Highest price paid (per ordinary share)                  517.50p                518.00p   517.50p   517.50p         
 Lowest price paid (per ordinary share)                   507.50p                506.50p   507.00p   507.50p         
 Volume weighted average price paid (per ordinary share)  512.24p                512.16p   512.20p   512.16p         



 30 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      66,156                 70,718    16,845    7,939           
 Highest price paid (per ordinary share)                  523.00p                523.00p   523.00p   523.00p         
 Lowest price paid (per ordinary share)                   498.00p                501.00p   500.50p   501.00p         
 Volume weighted average price paid (per ordinary share)  513.55p                513.63p   513.55p   513.75p         



 01 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      87,713                 99,841    23,948    11,212          
 Highest price paid (per ordinary share)                  527.00p                527.00p   526.50p   526.50p         
 Lowest price paid (per ordinary share)                   521.50p                521.00p   521.50p   521.50p         
 Volume weighted average price paid (per ordinary share)  523.96p                523.89p   523.96p   523.85p         

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 348,494,448 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 348,494,448.

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
*     2026.05.01_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/de2ad020-4dbe-4959-ae7a-13405561b9d4)