REG-OSB GROUP PLC - Transaction in Own Shares

OsbAnnouncement

Today 07:00

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OSB GROUP
PLC                                        
ISIN: GB00BLDRH360
18 December 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 17 December 2025 it had purchased a total of
54,887 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                      54,887                 -         -         
 Highest price paid (per ordinary share)                  607.50p                -         -         
 Lowest price paid (per ordinary share)                   601.00p                -         -         
 Volume weighted average price paid (per ordinary share)  604.57p                -         -         

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 356,541,617 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting
rights in the Company is 356,541,617.

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  
 17-12-2025        16:27:17    GBp       432     602.00  XLON           xeaMOArMBcF     
 17-12-2025        16:26:35    GBp       180     602.50  XLON           xeaMOArM8cO     
 17-12-2025        16:26:27    GBp       127     602.50  XLON           xeaMOArM8kk     
 17-12-2025        16:26:22    GBp       122     602.50  XLON           xeaMOArM8sg     
 17-12-2025        16:26:22    GBp       154     602.50  XLON           xeaMOArM8si     
 17-12-2025        16:26:22    GBp       155     602.50  XLON           xeaMOArM8sn     
 17-12-2025        16:26:22    GBp       8       602.50  XLON           xeaMOArM8sp     
 17-12-2025        16:25:39    GBp       124     602.50  XLON           xeaMOArM9ma     
 17-12-2025        16:25:39    GBp       1,545   602.50  XLON           xeaMOArM9m3     
 17-12-2025        16:23:47    GBp       15      602.50  XLON           xeaMOArNt08     
 17-12-2025        16:23:47    GBp       29      602.50  XLON           xeaMOArNt0A     
 17-12-2025        16:22:52    GBp       187     602.00  XLON           xeaMOArNqME     
 17-12-2025        16:17:03    GBp       356     601.00  XLON           xeaMOArNymF     
 17-12-2025        16:16:59    GBp       566     601.50  XLON           xeaMOArNy5q     
 17-12-2025        16:16:58    GBp       249     601.50  XLON           xeaMOArNy4z     
 17-12-2025        16:14:03    GBp       248     602.00  XLON           xeaMOArNusM     
 17-12-2025        16:13:57    GBp       883     602.00  XLON           xeaMOArNuwN     
 17-12-2025        16:13:00    GBp       242     602.00  XLON           xeaMOArNv6$     
 17-12-2025        16:12:25    GBp       1,381   602.50  XLON           xeaMOArNci9     
 17-12-2025        16:12:20    GBp       166     602.50  XLON           xeaMOArNchs     
 17-12-2025        16:12:17    GBp       267     603.00  XLON           xeaMOArNcmY     
 17-12-2025        16:12:17    GBp       274     603.00  XLON           xeaMOArNcme     
 17-12-2025        16:12:17    GBp       278     603.00  XLON           xeaMOArNcmw     
 17-12-2025        16:12:17    GBp       275     603.00  XLON           xeaMOArNcm0     
 17-12-2025        16:12:17    GBp       279     603.00  XLON           xeaMOArNcmC     
 17-12-2025        16:10:37    GBp       31      603.00  XLON           xeaMOArNasW     
 17-12-2025        16:10:37    GBp       1,673   603.00  XLON           xeaMOArNatU     
 17-12-2025        16:10:19    GBp       38      603.00  XLON           xeaMOArNa2L     
 17-12-2025        16:10:19    GBp       64      603.00  XLON           xeaMOArNa2N     
 17-12-2025        16:10:19    GBp       597     603.00  XLON           xeaMOArNa2P     
 17-12-2025        16:07:40    GBp       12      603.00  XLON           xeaMOArNZ9O     
 17-12-2025        16:07:40    GBp       168     603.00  XLON           xeaMOArNZ9Q     
 17-12-2025        15:52:43    GBp       379     602.50  XLON           xeaMOArNHAq     
 17-12-2025        15:52:21    GBp       716     602.50  XLON           xeaMOArNUpA     
 17-12-2025        15:50:00    GBp       847     603.00  XLON           xeaMOArNQ0S     
 17-12-2025        15:47:48    GBp       1,189   603.00  XLON           xeaMOArNPCu     
 17-12-2025        15:45:13    GBp       659     603.00  XLON           xeaMOArN4MW     
 17-12-2025        15:44:33    GBp       649     603.50  XLON           xeaMOArN5L0     
 17-12-2025        15:44:33    GBp       1,008   603.50  XLON           xeaMOArN5L6     
 17-12-2025        15:35:46    GBp       1,399   604.00  XLON           xeaMOArN9gt     
 17-12-2025        15:34:36    GBp       949     604.00  XLON           xeaMOArGsSX     
 17-12-2025        15:30:21    GBp       163     605.00  XLON           xeaMOArGmU$     
 17-12-2025        15:30:21    GBp       5       605.00  XLON           xeaMOArGmUx     
 17-12-2025        15:30:21    GBp       715     605.00  XLON           xeaMOArGmUz     
 17-12-2025        15:30:21    GBp       487     605.00  XLON           xeaMOArGmU5     
 17-12-2025        15:30:21    GBp       247     605.00  XLON           xeaMOArGmU7     
 17-12-2025        15:30:20    GBp       916     604.50  XLON           xeaMOArGmP7     
 17-12-2025        15:30:20    GBp       83      604.50  XLON           xeaMOArGmPD     
 17-12-2025        15:30:20    GBp       987     605.00  XLON           xeaMOArGmPK     
 17-12-2025        15:18:20    GBp       413     605.00  XLON           xeaMOArGWB9     
 17-12-2025        15:17:57    GBp       828     605.50  XLON           xeaMOArGXeG     
 17-12-2025        15:17:57    GBp       943     605.50  XLON           xeaMOArGXhk     
 17-12-2025        15:01:19    GBp       798     605.50  XLON           xeaMOArGRih     
 17-12-2025        15:01:18    GBp       364     606.00  XLON           xeaMOArGRiL     
 17-12-2025        15:01:18    GBp       883     606.00  XLON           xeaMOArGRiN     
 17-12-2025        14:55:12    GBp       297     606.00  XLON           xeaMOArG3Nz     
 17-12-2025        14:55:12    GBp       153     606.00  XLON           xeaMOArG3NK     
 17-12-2025        14:55:12    GBp       136     606.00  XLON           xeaMOArG3NM     
 17-12-2025        14:55:12    GBp       75      606.00  XLON           xeaMOArG3NO     
 17-12-2025        14:55:12    GBp       131     606.00  XLON           xeaMOArG3NQ     
 17-12-2025        14:55:12    GBp       275     606.00  XLON           xeaMOArG3NS     
 17-12-2025        14:55:12    GBp       537     606.00  XLON           xeaMOArG3NU     
 17-12-2025        14:53:19    GBp       589     606.50  XLON           xeaMOArGEhj     
 17-12-2025        14:53:15    GBp       283     607.00  XLON           xeaMOArGEtk     
 17-12-2025        14:52:21    GBp       195     607.50  XLON           xeaMOArGFxY     
 17-12-2025        14:52:21    GBp       195     607.50  XLON           xeaMOArGFxe     
 17-12-2025        14:52:21    GBp       197     607.50  XLON           xeaMOArGFxk     
 17-12-2025        14:52:20    GBp       189     607.50  XLON           xeaMOArGFxt     
 17-12-2025        14:52:20    GBp       192     607.50  XLON           xeaMOArGFx4     
 17-12-2025        14:52:20    GBp       197     607.50  XLON           xeaMOArGFxS     
 17-12-2025        14:52:20    GBp       188     607.50  XLON           xeaMOArGFwj     
 17-12-2025        14:52:20    GBp       124     607.50  XLON           xeaMOArGFw$     
 17-12-2025        14:52:20    GBp       402     607.50  XLON           xeaMOArGFw1     
 17-12-2025        14:52:20    GBp       188     607.50  XLON           xeaMOArGFw7     
 17-12-2025        14:52:19    GBp       192     607.50  XLON           xeaMOArGFwP     
 17-12-2025        14:52:19    GBp       193     607.50  XLON           xeaMOArGF5j     
 17-12-2025        14:40:15    GBp       1,144   606.00  XLON           xeaMOArHz8k     
 17-12-2025        14:40:13    GBp       424     606.00  XLON           xeaMOArHzKM     
 17-12-2025        14:40:13    GBp       880     607.00  XLON           xeaMOArHzN2     
 17-12-2025        14:40:13    GBp       167     607.00  XLON           xeaMOArHzN4     
 17-12-2025        14:40:13    GBp       327     607.00  XLON           xeaMOArHzN6     
 17-12-2025        14:40:13    GBp       598     607.00  XLON           xeaMOArHzN8     
 17-12-2025        14:40:13    GBp       330     607.00  XLON           xeaMOArHzNC     
 17-12-2025        14:38:34    GBp       75      606.50  XLON           xeaMOArHxR0     
 17-12-2025        14:38:34    GBp       139     606.50  XLON           xeaMOArHxR2     
 17-12-2025        14:38:34    GBp       295     606.50  XLON           xeaMOArHxRL     
 17-12-2025        14:38:34    GBp       316     606.50  XLON           xeaMOArHxRN     
 17-12-2025        14:38:34    GBp       508     606.50  XLON           xeaMOArHxRP     
 17-12-2025        14:38:34    GBp       41      606.50  XLON           xeaMOArHxRQ     
 17-12-2025        14:38:34    GBp       456     606.50  XLON           xeaMOArHxRS     
 17-12-2025        14:38:34    GBp       88      606.00  XLON           xeaMOArHxQh     
 17-12-2025        14:38:34    GBp       680     606.00  XLON           xeaMOArHxQj     
 17-12-2025        14:35:22    GBp       722     606.00  XLON           xeaMOArHaIi     
 17-12-2025        14:33:01    GBp       249     606.00  XLON           xeaMOArHWCC     
 17-12-2025        14:29:13    GBp       708     605.50  XLON           xeaMOArHhey     
 17-12-2025        14:20:32    GBp       271     606.00  XLON           xeaMOArHG9d     
 17-12-2025        14:14:16    GBp       103     606.00  XLON           xeaMOArHRYX     
 17-12-2025        14:14:16    GBp       130     606.00  XLON           xeaMOArHRYZ     
 17-12-2025        14:12:26    GBp       272     604.50  XLON           xeaMOArHPLT     
 17-12-2025        14:12:26    GBp       444     604.50  XLON           xeaMOArHPLV     
 17-12-2025        14:12:26    GBp       375     605.00  XLON           xeaMOArHPKr     
 17-12-2025        14:12:26    GBp       6       605.00  XLON           xeaMOArHPKt     
 17-12-2025        14:12:26    GBp       211     605.00  XLON           xeaMOArHPKv     
 17-12-2025        14:12:26    GBp       131     605.00  XLON           xeaMOArHPKx     
 17-12-2025        14:10:08    GBp       12      605.00  XLON           xeaMOArH7Qh     
 17-12-2025        14:10:08    GBp       12      605.00  XLON           xeaMOArH7Qj     
 17-12-2025        13:59:24    GBp       358     605.50  XLON           xeaMOArHB5d     
 17-12-2025        13:59:24    GBp       87      605.50  XLON           xeaMOArHB5f     
 17-12-2025        13:59:24    GBp       50      605.50  XLON           xeaMOArHB5h     
 17-12-2025        13:59:24    GBp       500     605.50  XLON           xeaMOArHB5Z     
 17-12-2025        13:47:10    GBp       189     605.00  XLON           xeaMOArI$r5     
 17-12-2025        13:47:10    GBp       461     605.00  XLON           xeaMOArI$r7     
 17-12-2025        13:26:03    GBp       585     605.50  XLON           xeaMOArIhJx     
 17-12-2025        13:22:17    GBp       342     605.00  XLON           xeaMOArINia     
 17-12-2025        13:22:17    GBp       345     605.50  XLON           xeaMOArINii     
 17-12-2025        13:21:52    GBp       496     606.00  XLON           xeaMOArIN1q     
 17-12-2025        13:21:21    GBp       699     606.50  XLON           xeaMOArINSA     
 17-12-2025        13:21:21    GBp       103     606.50  XLON           xeaMOArINSC     
 17-12-2025        13:21:21    GBp       195     606.50  XLON           xeaMOArINSP     
 17-12-2025        13:21:21    GBp       198     606.50  XLON           xeaMOArINSR     
 17-12-2025        13:21:01    GBp       246     605.50  XLON           xeaMOArIKr@     
 17-12-2025        13:21:01    GBp       13      605.50  XLON           xeaMOArIKr0     
 17-12-2025        13:21:01    GBp       495     605.50  XLON           xeaMOArIKry     
 17-12-2025        13:20:10    GBp       531     604.00  XLON           xeaMOArIKVN     
 17-12-2025        13:19:55    GBp       43      604.00  XLON           xeaMOArILhq     
 17-12-2025        13:19:55    GBp       150     604.00  XLON           xeaMOArILhs     
 17-12-2025        13:19:48    GBp       12      604.00  XLON           xeaMOArILmx     
 17-12-2025        13:19:48    GBp       292     604.00  XLON           xeaMOArILmz     
 17-12-2025        12:49:49    GBp       231     605.00  XLON           xeaMOArI8CP     
 17-12-2025        12:49:49    GBp       768     605.00  XLON           xeaMOArI8Fa     
 17-12-2025        12:49:49    GBp       100     605.00  XLON           xeaMOArI8Fc     
 17-12-2025        12:49:49    GBp       79      605.00  XLON           xeaMOArI8Fe     
 17-12-2025        12:49:49    GBp       13      605.00  XLON           xeaMOArI8Fg     
 17-12-2025        12:49:49    GBp       393     605.00  XLON           xeaMOArI8Fi     
 17-12-2025        12:49:49    GBp       66      605.00  XLON           xeaMOArI8Fk     
 17-12-2025        12:25:28    GBp       472     602.50  XLON           xeaMOArJa$k     
 17-12-2025        12:21:18    GBp       429     602.50  XLON           xeaMOArJZnC     
 17-12-2025        12:16:38    GBp       332     603.00  XLON           xeaMOArJlNZ     
 17-12-2025        12:16:33    GBp       688     603.00  XLON           xeaMOArJlTz     
 17-12-2025        12:14:24    GBp       148     604.00  XLON           xeaMOArJjDg     
 17-12-2025        12:14:24    GBp       71      604.00  XLON           xeaMOArJjDi     
 17-12-2025        12:12:12    GBp       230     604.00  XLON           xeaMOArJh0J     
 17-12-2025        12:02:40    GBp       449     603.50  XLON           xeaMOArJJ@y     
 17-12-2025        12:02:39    GBp       307     604.00  XLON           xeaMOArJJxE     
 17-12-2025        12:02:39    GBp       249     604.50  XLON           xeaMOArJJxI     
 17-12-2025        12:02:39    GBp       12      604.00  XLON           xeaMOArJJwa     
 17-12-2025        12:02:39    GBp       414     604.00  XLON           xeaMOArJJwc     
 17-12-2025        11:54:02    GBp       769     604.00  XLON           xeaMOArJOvG     
 17-12-2025        11:51:18    GBp       100     604.50  XLON           xeaMOArJ6wp     
 17-12-2025        11:51:18    GBp       32      604.50  XLON           xeaMOArJ6wr     
 17-12-2025        11:51:18    GBp       148     604.50  XLON           xeaMOArJ6wv     
 17-12-2025        11:49:06    GBp       167     604.50  XLON           xeaMOArJ4YB     
 17-12-2025        11:49:06    GBp       36      604.50  XLON           xeaMOArJ4YF