REG-Transaction in Own Shares

OsbAnnouncement

Mon 07:00

For best results when printing this announcement, please click on link below:
https://newsfile.refinitiv.com/getnewsfile/v1/story?guid=urn:newsml:reuters.com:20260518:nGNE9CBlC2&default-theme=true


OSB GROUP PLC
ISIN: GB00BLDRH360
18 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 11 May 2026 to 15 May 2026,
inclusive, it had purchased a total of 1,519,438 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.

 11 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      92,324                 116,197   26,739    14,096          
 Highest price paid (per ordinary share)                  516.50p                516.50p   516.50p   516.00p         
 Lowest price paid (per ordinary share)                   510.50p                510.50p   510.50p   511.50p         
 Volume weighted average price paid (per ordinary share)  513.96p                513.96p   513.95p   513.99p         



 12 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      110,985                141,175   32,853    16,808          
 Highest price paid (per ordinary share)                  506.00p                504.00p   504.50p   501.00p         
 Lowest price paid (per ordinary share)                   484.60p                484.00p   484.40p   484.40p         
 Volume weighted average price paid (per ordinary share)  490.79p                490.85p   490.78p   490.78p         



 13 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      118,472                150,683   35,076    17,944          
 Highest price paid (per ordinary share)                  491.60p                491.60p   491.80p   491.00p         
 Lowest price paid (per ordinary share)                   479.20p                479.00p   479.20p   479.40p         
 Volume weighted average price paid (per ordinary share)  484.25p                484.26p   484.26p   484.27p         



 14 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      123,234                149,237   35,779    17,460          
 Highest price paid (per ordinary share)                  492.00p                492.00p   492.00p   491.80p         
 Lowest price paid (per ordinary share)                   483.60p                483.60p   483.60p   483.60p         
 Volume weighted average price paid (per ordinary share)  488.16p                488.20p   488.18p   488.10p         



 15 May 2026                                              London Stock Exchange  CBOE BXE  CBOE CXE  Aquis Exchange  
 Number of ordinary shares purchased                      121,060                146,906   35,222    17,188          
 Highest price paid (per ordinary share)                  496.60p                496.00p   496.40p   496.20p         
 Lowest price paid (per ordinary share)                   486.60p                487.40p   487.20p   488.00p         
 Volume weighted average price paid (per ordinary share)  491.49p                491.48p   491.49p   491.50p         

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 346,025,922 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 346,025,922.

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
*     2026.05.15_OSBG Buyback Fills
(https://ml-eu.globenewswire.com/Resource/Download/d5cbb70f-5cbf-4735-a834-b986570b4ec0)