REG-Transaction in own shares

OsbAnnouncement

30/09/2025 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
30 September 2025

LEI number: 213800ZBKL9BHSL2K459

OSB GROUP PLC (the “Company”) 
Transaction in Own Shares

The Company announces that on 29 September 2025 it had purchased a total of
23,934 of its ordinary shares of £0.01 each (the "ordinary shares") on the
London Stock Exchange, CBOE BXE and CBOE CXE, through the Company's broker
Citigroup Global Markets Limited as detailed below. The repurchased ordinary
shares will be cancelled.

                                                          London Stock Exchange  CBOE BXE  CBOE CXE  
 Number of ordinary shares purchased                      23,934                 -         -         
 Highest price paid (per ordinary share)                  557.00p                -         -         
 Lowest price paid (per ordinary share)                   551.50p                -         -         
 Volume weighted average price paid (per ordinary share)  555.46p                -         -         

The purchases form part of the Company’s share buyback programme announced
on 13 March 2025.

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 360,196,554 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 360,196,554.

In accordance with Article 5(1)(b) of Regulation (EU) No 596/2014 as
incorporated into and implemented under English law (including by virtue of
the European Union (Withdrawal) Act 2018), the detailed breakdown of
individual trades made by Citigroup Global Markets 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 – Individual Transactions

 Issuer Name        OSB GROUP PLC                     
 LEI                213800ZBKL9BHSL2K459              
 ISIN               GB00BLDRH360                      
 Intermediary Name  Citigroup Global Markets Limited  
 Intermediary Code  SBILGB2L                          
 Timezone           GMT+1                             
 Currency           GBP                               



 Transaction Date  Trade Time  Currency  Volume  Price   Trading Venue  Transaction ID  
 29-09-2025        16:19:17    GBp       323     555.00  XLON           xeaNi2SKpyW     
 29-09-2025        16:19:17    GBp       44      555.00  XLON           xeaNi2SKpyY     
 29-09-2025        16:18:28    GBp       1,172   555.00  XLON           xeaNi2SKmsL     
 29-09-2025        16:15:34    GBp       836     555.00  XLON           xeaNi2SK$Sd     
 29-09-2025        16:06:17    GBp       557     554.50  XLON           xeaNi2SKY1M     
 29-09-2025        15:56:45    GBp       403     554.50  XLON           xeaNi2SKMsS     
 29-09-2025        15:54:08    GBp       365     554.50  XLON           xeaNi2SKL$9     
 29-09-2025        15:54:08    GBp       438     554.50  XLON           xeaNi2SKL$E     
 29-09-2025        15:38:47    GBp       367     553.50  XLON           xeaNi2SK1Rq     
 29-09-2025        15:30:24    GBp       218     554.00  XLON           xeaNi2SLm4b     
 29-09-2025        15:26:49    GBp       214     553.50  XLON           xeaNi2SLz8A     
 29-09-2025        15:23:51    GBp       157     553.50  XLON           xeaNi2SLcrh     
 29-09-2025        15:18:16    GBp       309     553.50  XLON           xeaNi2SLX7m     
 29-09-2025        15:17:30    GBp       32      553.50  XLON           xeaNi2SLk9V     
 29-09-2025        15:10:39    GBp       137     553.50  XLON           xeaNi2SLKjP     
 29-09-2025        15:10:39    GBp       95      553.50  XLON           xeaNi2SLKjR     
 29-09-2025        15:04:54    GBp       220     553.50  XLON           xeaNi2SLSEM     
 29-09-2025        15:00:30    GBp       259     552.00  XLON           xeaNi2SL729     
 29-09-2025        14:55:13    GBp       383     551.50  XLON           xeaNi2SLCfh     
 29-09-2025        14:47:18    GBp       258     552.50  XLON           xeaNi2SMnYG     
 29-09-2025        14:47:16    GBp       162     552.50  XLON           xeaNi2SMnlL     
 29-09-2025        14:38:50    GBp       308     554.00  XLON           xeaNi2SMZAG     
 29-09-2025        14:32:21    GBp       321     555.50  XLON           xeaNi2SMf7q     
 29-09-2025        14:31:23    GBp       122     555.50  XLON           xeaNi2SMNmx     
 29-09-2025        14:20:46    GBp       264     554.50  XLON           xeaNi2SM6Xz     
 29-09-2025        14:11:07    GBp       246     555.50  XLON           xeaNi2SMFQj     
 29-09-2025        14:04:01    GBp       320     556.00  XLON           xeaNi2SNtut     
 29-09-2025        13:50:44    GBp       276     555.00  XLON           xeaNi2SNuBV     
 29-09-2025        13:38:33    GBp       221     554.50  XLON           xeaNi2SNjZD     
 29-09-2025        13:29:15    GBp       267     554.50  XLON           xeaNi2SNIwJ     
 29-09-2025        13:29:12    GBp       53      554.50  XLON           xeaNi2SNI4z     
 29-09-2025        13:16:11    GBp       271     555.00  XLON           xeaNi2SN6Ja     
 29-09-2025        13:03:10    GBp       238     555.50  XLON           xeaNi2SNAOI     
 29-09-2025        13:02:41    GBp       15      555.50  XLON           xeaNi2SNBuK     
 29-09-2025        12:50:36    GBp       219     556.00  XLON           xeaNi2SGnxw     
 29-09-2025        12:40:12    GBp       306     555.50  XLON           xeaNi2SGcuI     
 29-09-2025        12:30:15    GBp       122     554.50  XLON           xeaNi2SGkNv     
 29-09-2025        12:20:40    GBp       10      556.50  XLON           xeaNi2SGMtS     
 29-09-2025        12:20:40    GBp       433     556.50  XLON           xeaNi2SGMsX     
 29-09-2025        12:20:36    GBp       201     556.50  XLON           xeaNi2SGMp@     
 29-09-2025        12:20:36    GBp       432     556.50  XLON           xeaNi2SGMpy     
 29-09-2025        12:19:26    GBp       571     557.00  XLON           xeaNi2SGNy6     
 29-09-2025        10:37:54    GBp       761     557.00  XLON           xeaNi2SItil     
 29-09-2025        10:24:53    GBp       485     557.00  XLON           xeaNi2SIwJL     
 29-09-2025        10:05:24    GBp       917     555.50  XLON           xeaNi2SIMYJ     
 29-09-2025        10:05:24    GBp       93      556.00  XLON           xeaNi2SIMYL     
 29-09-2025        10:05:24    GBp       247     556.00  XLON           xeaNi2SIMYP     
 29-09-2025        10:03:55    GBp       205     556.00  XLON           xeaNi2SIN5T     
 29-09-2025        09:59:00    GBp       91      556.00  XLON           xeaNi2SIG4m     
 29-09-2025        09:59:00    GBp       250     556.00  XLON           xeaNi2SIG4o     
 29-09-2025        09:59:00    GBp       6       556.00  XLON           xeaNi2SIG4q     
 29-09-2025        09:58:01    GBp       205     556.00  XLON           xeaNi2SIHnx     
 29-09-2025        09:56:03    GBp       118     556.00  XLON           xeaNi2SIVfw     
 29-09-2025        09:56:03    GBp       87      556.00  XLON           xeaNi2SIVfy     
 29-09-2025        09:53:00    GBp       261     556.00  XLON           xeaNi2SIQqe     
 29-09-2025        09:53:00    GBp       485     556.00  XLON           xeaNi2SIQqn     
 29-09-2025        09:41:45    GBp       695     556.50  XLON           xeaNi2SI1WD     
 29-09-2025        09:35:27    GBp       612     556.00  XLON           xeaNi2SI8Ml     
 29-09-2025        09:29:51    GBp       246     556.00  XLON           xeaNi2SJn69     
 29-09-2025        09:28:57    GBp       661     556.50  XLON           xeaNi2SJ@v5     
 29-09-2025        09:24:01    GBp       96      556.50  XLON           xeaNi2SJx2l     
 29-09-2025        09:24:01    GBp       50      556.50  XLON           xeaNi2SJx2n     
 29-09-2025        09:24:01    GBp       536     556.50  XLON           xeaNi2SJx2p     
 29-09-2025        09:23:02    GBp       35      556.00  XLON           xeaNi2SJuoh     
 29-09-2025        09:23:02    GBp       104     556.00  XLON           xeaNi2SJuoj     
 29-09-2025        09:23:02    GBp       481     556.50  XLON           xeaNi2SJuol     
 29-09-2025        09:23:02    GBp       105     556.50  XLON           xeaNi2SJuon     
 29-09-2025        09:23:02    GBp       70      556.50  XLON           xeaNi2SJuop     
 29-09-2025        09:06:01    GBp       4       555.50  XLON           xeaNi2SJMbZ     
 29-09-2025        09:05:25    GBp       132     555.50  XLON           xeaNi2SJMLq     
 29-09-2025        09:05:16    GBp       15      555.50  XLON           xeaNi2SJMSo     
 29-09-2025        09:05:16    GBp       636     555.50  XLON           xeaNi2SJMSq     
 29-09-2025        09:02:47    GBp       664     555.50  XLON           xeaNi2SJL@i     
 29-09-2025        08:57:48    GBp       319     556.00  XLON           xeaNi2SJUYH     
 29-09-2025        08:57:23    GBp       631     556.50  XLON           xeaNi2SJU7K     
 29-09-2025        08:30:03    GBp       288     556.00  XLON           xeaNi2SC$uK     
 29-09-2025        08:26:36    GBp       412     556.50  XLON           xeaNi2SCxgM     
 29-09-2025        08:21:39    GBp       766     557.00  XLON           xeaNi2SCaTv