REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

Today 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
17 December 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 16 December 2025 it had purchased a total of
32,300 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                      32,300                 -         -         
 Highest price paid (per ordinary share)                  600.00p                -         -         
 Lowest price paid (per ordinary share)                   595.50p                -         -         
 Volume weighted average price paid (per ordinary share)  597.92p                -         -         

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 356,596,504 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 356,596,504.

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  
 16-12-2025        16:27:00    GBp       81      597.50  XLON           xeaMO4XleL9     
 16-12-2025        16:27:00    GBp       157     597.50  XLON           xeaMO4XleLB     
 16-12-2025        16:26:34    GBp       341     597.50  XLON           xeaMO4Xlf1f     
 16-12-2025        16:25:55    GBp       129     598.00  XLON           xeaMO4XlMVx     
 16-12-2025        16:25:55    GBp       100     598.00  XLON           xeaMO4XlMVz     
 16-12-2025        16:25:27    GBp       100     598.00  XLON           xeaMO4XlNEX     
 16-12-2025        16:25:27    GBp       93      598.00  XLON           xeaMO4XlNFV     
 16-12-2025        16:25:00    GBp       228     598.00  XLON           xeaMO4XlK9C     
 16-12-2025        16:24:30    GBp       220     598.00  XLON           xeaMO4XlL32     
 16-12-2025        16:24:00    GBp       233     598.00  XLON           xeaMO4XlI$d     
 16-12-2025        16:23:31    GBp       192     598.00  XLON           xeaMO4XlJjk     
 16-12-2025        16:13:01    GBp       408     596.00  XLON           xeaMO4Xl0OB     
 16-12-2025        16:08:03    GBp       271     597.50  XLON           xeaMO4Xl8Gf     
 16-12-2025        16:08:03    GBp       104     597.50  XLON           xeaMO4Xl8Gh     
 16-12-2025        16:07:24    GBp       262     598.00  XLON           xeaMO4Xl9P$     
 16-12-2025        16:07:24    GBp       113     598.00  XLON           xeaMO4Xl9P1     
 16-12-2025        16:04:27    GBp       536     598.50  XLON           xeaMO4XeoIF     
 16-12-2025        16:04:25    GBp       204     599.00  XLON           xeaMO4XeoSg     
 16-12-2025        16:04:25    GBp       89      599.00  XLON           xeaMO4XeoSi     
 16-12-2025        16:04:25    GBp       204     599.00  XLON           xeaMO4XeoSk     
 16-12-2025        16:04:25    GBp       315     599.00  XLON           xeaMO4XeoSp     
 16-12-2025        16:04:25    GBp       266     599.00  XLON           xeaMO4XeoSr     
 16-12-2025        15:59:55    GBp       529     598.00  XLON           xeaMO4XexW1     
 16-12-2025        15:53:00    GBp       78      597.50  XLON           xeaMO4Xek$7     
 16-12-2025        15:53:00    GBp       215     597.50  XLON           xeaMO4Xek$9     
 16-12-2025        15:53:00    GBp       62      597.50  XLON           xeaMO4Xek$B     
 16-12-2025        15:50:03    GBp       163     597.50  XLON           xeaMO4XehAD     
 16-12-2025        15:50:03    GBp       17      597.50  XLON           xeaMO4XehAE     
 16-12-2025        15:50:03    GBp       52      597.50  XLON           xeaMO4XehAG     
 16-12-2025        15:50:03    GBp       32      597.50  XLON           xeaMO4XehAI     
 16-12-2025        15:50:03    GBp       36      597.50  XLON           xeaMO4XehAM     
 16-12-2025        15:47:06    GBp       294     597.50  XLON           xeaMO4XeKkt     
 16-12-2025        15:47:06    GBp       42      597.50  XLON           xeaMO4XeKkv     
 16-12-2025        15:45:08    GBp       174     597.50  XLON           xeaMO4XeJzL     
 16-12-2025        15:45:08    GBp       33      597.50  XLON           xeaMO4XeJzP     
 16-12-2025        15:45:08    GBp       29      597.50  XLON           xeaMO4XeJzR     
 16-12-2025        15:36:39    GBp       814     597.50  XLON           xeaMO4Xe4l9     
 16-12-2025        15:33:20    GBp       116     598.00  XLON           xeaMO4Xe1lp     
 16-12-2025        15:33:20    GBp       99      598.00  XLON           xeaMO4Xe1lq     
 16-12-2025        15:33:20    GBp       171     598.00  XLON           xeaMO4Xe1ls     
 16-12-2025        15:30:23    GBp       257     598.00  XLON           xeaMO4XeDcl     
 16-12-2025        15:26:27    GBp       120     598.00  XLON           xeaMO4Xfs0c     
 16-12-2025        15:26:27    GBp       298     598.00  XLON           xeaMO4Xfs0e     
 16-12-2025        15:26:27    GBp       26      598.00  XLON           xeaMO4Xfs0g     
 16-12-2025        15:16:07    GBp       458     597.50  XLON           xeaMO4XfcQa     
 16-12-2025        15:09:58    GBp       300     597.50  XLON           xeaMO4XfjxS     
 16-12-2025        15:09:58    GBp       589     597.50  XLON           xeaMO4XfjwY     
 16-12-2025        15:08:45    GBp       326     598.00  XLON           xeaMO4Xfhpk     
 16-12-2025        15:08:45    GBp       75      598.00  XLON           xeaMO4Xfhpp     
 16-12-2025        15:04:49    GBp       440     597.50  XLON           xeaMO4XfIhY     
 16-12-2025        14:53:06    GBp       462     598.00  XLON           xeaMO4Xf0KL     
 16-12-2025        14:53:02    GBp       532     598.50  XLON           xeaMO4Xf0PF     
 16-12-2025        14:53:02    GBp       129     598.50  XLON           xeaMO4Xf0PH     
 16-12-2025        14:52:02    GBp       213     599.00  XLON           xeaMO4XfE6R     
 16-12-2025        14:49:26    GBp       866     598.00  XLON           xeaMO4XfAoB     
 16-12-2025        14:49:26    GBp       390     598.00  XLON           xeaMO4XfAoD     
 16-12-2025        14:49:26    GBp       250     598.00  XLON           xeaMO4XfAoF     
 16-12-2025        14:49:26    GBp       430     597.50  XLON           xeaMO4XfAoI     
 16-12-2025        14:48:38    GBp       152     598.00  XLON           xeaMO4XfB7c     
 16-12-2025        14:48:38    GBp       300     598.00  XLON           xeaMO4XfB7e     
 16-12-2025        14:48:38    GBp       430     598.00  XLON           xeaMO4XfB7l     
 16-12-2025        14:26:57    GBp       13      598.00  XLON           xeaMO4XgfRy     
 16-12-2025        14:03:04    GBp       57      596.50  XLON           xeaMO4XgF86     
 16-12-2025        14:03:04    GBp       372     596.50  XLON           xeaMO4XgF88     
 16-12-2025        14:02:46    GBp       539     597.00  XLON           xeaMO4XgFOR     
 16-12-2025        13:58:21    GBp       5       597.00  XLON           xeaMO4Xg89c     
 16-12-2025        13:57:20    GBp       683     597.50  XLON           xeaMO4Xg98d     
 16-12-2025        13:32:07    GBp       329     598.50  XLON           xeaMO4Xhkce     
 16-12-2025        13:26:57    GBp       292     598.50  XLON           xeaMO4XhhWL     
 16-12-2025        13:26:41    GBp       272     598.50  XLON           xeaMO4XhhtZ     
 16-12-2025        13:23:38    GBp       718     599.00  XLON           xeaMO4XhfEH     
 16-12-2025        13:20:35    GBp       40      600.00  XLON           xeaMO4XhKrW     
 16-12-2025        13:20:35    GBp       181     600.00  XLON           xeaMO4XhKrY     
 16-12-2025        13:14:41    GBp       269     600.00  XLON           xeaMO4XhG99     
 16-12-2025        13:09:46    GBp       181     600.00  XLON           xeaMO4XhS4h     
 16-12-2025        13:09:46    GBp       3       600.00  XLON           xeaMO4XhS4j     
 16-12-2025        13:04:29    GBp       225     600.00  XLON           xeaMO4XhO5v     
 16-12-2025        13:04:29    GBp       67      600.00  XLON           xeaMO4XhO5x     
 16-12-2025        12:37:06    GBp       319     599.00  XLON           xeaMO4XaqJB     
 16-12-2025        12:30:02    GBp       133     599.50  XLON           xeaMO4XanLs     
 16-12-2025        12:30:02    GBp       252     599.50  XLON           xeaMO4XanLu     
 16-12-2025        12:29:06    GBp       168     599.50  XLON           xeaMO4Xa@pR     
 16-12-2025        12:27:35    GBp       729     600.00  XLON           xeaMO4Xa$yU     
 16-12-2025        12:27:29    GBp       58      600.00  XLON           xeaMO4Xa$u9     
 16-12-2025        12:27:29    GBp       105     600.00  XLON           xeaMO4Xa$uB     
 16-12-2025        12:27:29    GBp       250     600.00  XLON           xeaMO4Xa$uD     
 16-12-2025        12:27:29    GBp       326     600.00  XLON           xeaMO4Xa$uH     
 16-12-2025        12:27:29    GBp       228     600.00  XLON           xeaMO4Xa$uJ     
 16-12-2025        12:27:29    GBp       650     600.00  XLON           xeaMO4Xa$uL     
 16-12-2025        11:27:31    GBp       701     598.00  XLON           xeaMO4Xa04A     
 16-12-2025        11:21:17    GBp       313     598.50  XLON           xeaMO4XaDj0     
 16-12-2025        10:55:07    GBp       333     598.50  XLON           xeaMO4Xbv81     
 16-12-2025        10:49:20    GBp       440     597.00  XLON           xeaMO4XbYXL     
 16-12-2025        10:49:20    GBp       11      598.00  XLON           xeaMO4XbYXN     
 16-12-2025        10:49:20    GBp       205     598.00  XLON           xeaMO4XbYXP     
 16-12-2025        10:49:20    GBp       621     598.00  XLON           xeaMO4XbYXR     
 16-12-2025        10:49:20    GBp       167     598.00  XLON           xeaMO4XbYXT     
 16-12-2025        10:34:58    GBp       1       597.00  XLON           xeaMO4Xbfy1     
 16-12-2025        10:30:49    GBp       123     598.00  XLON           xeaMO4XbK5C     
 16-12-2025        10:30:49    GBp       312     598.00  XLON           xeaMO4XbK5E     
 16-12-2025        10:20:05    GBp       38      596.50  XLON           xeaMO4XbTeB     
 16-12-2025        10:20:05    GBp       39      596.50  XLON           xeaMO4XbTeD     
 16-12-2025        09:55:14    GBp       391     596.00  XLON           xeaMO4XcsJD     
 16-12-2025        09:50:19    GBp       282     596.50  XLON           xeaMO4Xcp2o     
 16-12-2025        09:44:58    GBp       149     597.00  XLON           xeaMO4Xczok     
 16-12-2025        09:44:58    GBp       184     597.00  XLON           xeaMO4Xczom     
 16-12-2025        09:36:48    GBp       357     597.00  XLON           xeaMO4Xcasx     
 16-12-2025        09:36:48    GBp       719     597.00  XLON           xeaMO4XcasS     
 16-12-2025        09:29:13    GBp       515     598.00  XLON           xeaMO4XclR$     
 16-12-2025        09:29:13    GBp       459     598.00  XLON           xeaMO4XclRA     
 16-12-2025        09:29:13    GBp       200     598.00  XLON           xeaMO4XclRC     
 16-12-2025        09:29:13    GBp       13      598.00  XLON           xeaMO4XclRE     
 16-12-2025        08:56:53    GBp       688     597.50  XLON           xeaMO4XcBfk     
 16-12-2025        08:53:07    GBp       282     598.00  XLON           xeaMO4Xdtvf     
 16-12-2025        08:35:05    GBp       245     596.00  XLON           xeaMO4Xdbk6     
 16-12-2025        08:35:05    GBp       268     596.00  XLON           xeaMO4Xdbk8     
 16-12-2025        08:29:05    GBp       131     596.00  XLON           xeaMO4Xdl1W     
 16-12-2025        08:29:05    GBp       551     596.00  XLON           xeaMO4Xdl6U     
 16-12-2025        08:23:11    GBp       281     596.50  XLON           xeaMO4XdeVz     
 16-12-2025        08:18:42    GBp       292     596.50  XLON           xeaMO4XdLuy     
 16-12-2025        08:15:00    GBp       430     595.50  XLON           xeaMO4XdHce     
 16-12-2025        08:07:53    GBp       43      596.00  XLON           xeaMO4XdR1M     
 16-12-2025        08:07:53    GBp       214     596.00  XLON           xeaMO4XdR1O     
 16-12-2025        08:04:56    GBp       96      596.00  XLON           xeaMO4Xd7ZB     
 16-12-2025        08:04:56    GBp       97      596.00  XLON           xeaMO4Xd7ZD