REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

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OSB GROUP PLC
ISIN: GB00BLDRH360
20 April 2026

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that, for the period from 13 April 2026 to 17 April
2026, inclusive, it had purchased a total of 706,075 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.

 13 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      60,289                 48,860    14,463    6,568           
 Highest price paid (per ordinary share)                  548.50p                548.00p   548.50p   548.00p         
 Lowest price paid (per ordinary share)                   543.00p                543.50p   543.50p   543.50p         
 Volume weighted average price paid (per ordinary share)  545.91p                545.93p   545.92p   545.96p         



 14 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      67,555                 54,556    15,598    7,334           
 Highest price paid (per ordinary share)                  556.50p                556.50p   557.00p   556.50p         
 Lowest price paid (per ordinary share)                   548.50p                548.50p   549.50p   552.00p         
 Volume weighted average price paid (per ordinary share)  554.27p                554.26p   554.28p   554.45p         



 15 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      67,471                 54,482    15,578    7,346           
 Highest price paid (per ordinary share)                  561.00p                560.50p   561.00p   557.50p         
 Lowest price paid (per ordinary share)                   554.00p                554.00p   554.00p   553.50p         
 Volume weighted average price paid (per ordinary share)  555.79p                555.81p   555.77p   555.76p         



 16 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      67,506                 55,014    15,720    7,410           
 Highest price paid (per ordinary share)                  564.00p                564.00p   564.00p   564.00p         
 Lowest price paid (per ordinary share)                   553.50p                553.50p   553.50p   553.50p         
 Volume weighted average price paid (per ordinary share)  558.98p                558.97p   558.94p   558.92p         



 17 April 2026                                            London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      62,910                 55,118    15,107    7,190           
 Highest price paid (per ordinary share)                  568.50p                568.50p   569.00p   568.50p         
 Lowest price paid (per ordinary share)                   552.00p                552.00p   552.00p   552.50p         
 Volume weighted average price paid (per ordinary share)  559.72p                559.73p   559.84p   559.90p         

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 350,315,592 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 350,315,592.

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
*     2026.04.17_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/2de63c42-6847-4b29-a59e-f42b7c275690)