OSB GROUP PLC - Transaction in Own Shares

OSB GROUP PLC
ISIN: GB00BLDRH360
29 October 2025

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that on 28 October 2025 it had purchased a total of 68,032 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 ExchangeCBOE BXECBOE CXENumber of ordinary shares purchased68,032--Highest price paid (per ordinary share)551.50p--Lowest price paid (per ordinary share)542.50p--Volume weighted average price paid (per ordinary share)546.43p--

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 358,449,876 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting rights in the Company is 358,449,876.

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 NameOSB GROUP PLCLEI213800ZBKL9BHSL2K459ISINGB00BLDRH360Intermediary NameCitigroup Global Markets LimitedIntermediary CodeSBILGB2LTimezone GMT+1CurrencyGBP

Transaction DateTrade TimeCurrencyVolumePriceTrading VenueTransaction ID28-10-202516:21:14GBp537546.50XLONxHaNXdDFa6228-10-202516:21:14GBp88547.50XLONxHaNXdDFa6B28-10-202516:21:14GBp92547.50XLONxHaNXdDFa6D28-10-202516:21:14GBp36547.50XLONxHaNXdDFa6F28-10-202516:21:14GBp526547.00XLONxHaNXdDFa6L28-10-202516:14:38GBp189547.50XLONxHaNXdDFjSO28-10-202516:13:30GBp188547.50XLONxHaNXdDFhNy28-10-202516:12:05GBp118547.00XLONxHaNXdDFMkN28-10-202516:12:05GBp44547.00XLONxHaNXdDFMkQ28-10-202516:12:05GBp15547.00XLONxHaNXdDFMkS28-10-202516:10:40GBp190547.00XLONxHaNXdDFNVk28-10-202516:01:51GBp553546.50XLONxHaNXdDFQaH28-10-202515:59:42GBp248546.50XLONxHaNXdDFO9k28-10-202515:59:42GBp289546.50XLONxHaNXdDFO9r28-10-202515:59:38GBp259547.00XLONxHaNXdDFOHE28-10-202515:41:21GBp316545.00XLONxHaNXdD8ms928-10-202515:37:20GBp246545.50XLONxHaNXdD8yRu28-10-202515:36:57GBp53545.50XLONxHaNXdD8z7F28-10-202515:33:04GBp295546.50XLONxHaNXdD8djh28-10-202515:33:01GBp426547.00XLONxHaNXdD8dii28-10-202515:27:42GBp543546.50XLONxHaNXdD8XxH28-10-202515:27:42GBp18546.50XLONxHaNXdD8XxJ28-10-202515:27:42GBp403546.50XLONxHaNXdD8Xwf28-10-202515:13:25GBp432545.50XLONxHaNXdD8V@w28-10-202515:07:39GBp293545.50XLONxHaNXdD861A28-10-202515:03:49GBp394545.50XLONxHaNXdD83aB28-10-202514:53:28GBp382545.50XLONxHaNXdD9tRp28-10-202514:52:51GBp199546.00XLONxHaNXdD9qLK28-10-202514:52:51GBp212546.00XLONxHaNXdD9qLM28-10-202514:46:41GBp260546.00XLONxHaNXdD9z7C28-10-202514:39:20GBp304547.50XLONxHaNXdD9Z0$28-10-202514:39:20GBp44547.50XLONxHaNXdD9Z0728-10-202514:39:20GBp500548.00XLONxHaNXdD9Z0A28-10-202514:34:25GBp664548.50XLONxHaNXdD9g4X28-10-202514:18:26GBp149549.50XLONxHaNXdD97VL28-10-202514:18:26GBp111549.50XLONxHaNXdD97VN28-10-202514:17:26GBp309549.50XLONxHaNXdD95e828-10-202514:07:03GBp402549.00XLONxHaNXdDAtrS28-10-202514:01:35GBp222549.00XLONxHaNXdDA@s928-10-202513:58:20GBp8549.00XLONxHaNXdDAw2$28-10-202513:58:19GBp334549.00XLONxHaNXdDAwDZ28-10-202513:58:01GBp490549.50XLONxHaNXdDAxaC28-10-202513:41:20GBp144548.50XLONxHaNXdDAMQi28-10-202513:41:19GBp162548.50XLONxHaNXdDAMQJ28-10-202513:41:18GBp1,195548.50XLONxHaNXdDANbL28-10-202513:41:18GBp245549.00XLONxHaNXdDANbM28-10-202513:41:18GBp17549.00XLONxHaNXdDANbO28-10-202513:41:18GBp363549.00XLONxHaNXdDANbQ28-10-202513:40:06GBp227549.00XLONxHaNXdDAKFd28-10-202513:40:06GBp418549.00XLONxHaNXdDAKFL28-10-202513:40:06GBp409549.00XLONxHaNXdDAKFV28-10-202513:36:41GBp826548.50XLONxHaNXdDAHwh28-10-202513:34:49GBp332548.50XLONxHaNXdDASet28-10-202513:33:33GBp35548.50XLONxHaNXdDATHI28-10-202513:32:28GBp292549.00XLONxHaNXdDARrD28-10-202513:32:22GBp1,046549.50XLONxHaNXdDARza28-10-202513:32:22GBp55549.50XLONxHaNXdDARzc28-10-202513:32:22GBp415549.50XLONxHaNXdDARze28-10-202513:32:22GBp246549.50XLONxHaNXdDARzg28-10-202513:29:54GBp684549.00XLONxHaNXdDA6Or28-10-202513:26:46GBp123549.00XLONxHaNXdDA2Xr28-10-202513:26:45GBp321549.50XLONxHaNXdDA2Wh28-10-202513:26:45GBp274549.50XLONxHaNXdDA2WH28-10-202513:26:45GBp278549.50XLONxHaNXdDA2WV28-10-202513:26:45GBp569549.50XLONxHaNXdDA2Zf28-10-202513:22:01GBp203548.00XLONxHaNXdDAFd$28-10-202513:17:11GBp335548.50XLONxHaNXdDA8iG28-10-202513:17:11GBp338548.50XLONxHaNXdDA8iI28-10-202513:15:25GBp679549.00XLONxHaNXdDA9Vk28-10-202513:06:54GBp763549.00XLONxHaNXdDB@DS28-10-202512:59:55GBp129548.00XLONxHaNXdDBvHq28-10-202512:59:55GBp67548.00XLONxHaNXdDBvHs28-10-202512:59:55GBp93548.00XLONxHaNXdDBvHu28-10-202512:59:38GBp328548.00XLONxHaNXdDBcdm28-10-202512:59:17GBp21548.00XLONxHaNXdDBcn628-10-202512:58:46GBp733548.50XLONxHaNXdDBcK828-10-202512:48:48GBp926547.50XLONxHaNXdDBlGh28-10-202512:48:48GBp150547.50XLONxHaNXdDBlGj28-10-202512:47:15GBp233548.00XLONxHaNXdDBjZO28-10-202512:46:10GBp260548.00XLONxHaNXdDBgkW28-10-202512:46:10GBp260548.00XLONxHaNXdDBgk$28-10-202512:45:59GBp342548.00XLONxHaNXdDBg5s28-10-202512:45:59GBp991548.00XLONxHaNXdDBg5u28-10-202512:45:59GBp498548.00XLONxHaNXdDBg5w28-10-202512:27:43GBp886546.50XLONxHaNXdDBQqH28-10-202512:27:40GBp224546.50XLONxHaNXdDBQsF28-10-202512:27:40GBp19546.50XLONxHaNXdDBQsH28-10-202512:26:46GBp146546.50XLONxHaNXdDBQOR28-10-202512:26:46GBp55546.50XLONxHaNXdDBQOT28-10-202512:26:46GBp56546.50XLONxHaNXdDBQOV28-10-202512:26:46GBp524546.00XLONxHaNXdDBQRa28-10-202512:26:46GBp34546.00XLONxHaNXdDBQRc28-10-202512:22:54GBp472546.00XLONxHaNXdDB6by28-10-202512:22:54GBp78546.00XLONxHaNXdDB6b@28-10-202512:19:05GBp713545.50XLONxHaNXdDB5jl28-10-202512:19:05GBp63545.50XLONxHaNXdDB5jm28-10-202512:19:05GBp239545.50XLONxHaNXdDB5ju28-10-202512:19:05GBp1,629545.50XLONxHaNXdDB5j728-10-202512:19:05GBp380545.50XLONxHaNXdDB5j928-10-202512:19:05GBp335545.50XLONxHaNXdDB5jB28-10-202512:00:00GBp606544.00XLONxHaNXdD4qo$28-10-202512:00:00GBp427544.00XLONxHaNXdD4qoz28-10-202512:00:00GBp510544.00XLONxHaNXdD4q4W28-10-202512:00:00GBp700544.00XLONxHaNXdD4q4Y28-10-202512:00:00GBp489543.50XLONxHaNXdD4q4L28-10-202511:58:32GBp282544.50XLONxHaNXdD4rB328-10-202511:58:32GBp46544.50XLONxHaNXdD4rB528-10-202511:58:32GBp490544.00XLONxHaNXdD4rBA28-10-202511:56:49GBp478544.50XLONxHaNXdD4oO@28-10-202511:32:26GBp525544.00XLONxHaNXdD4W9h28-10-202511:27:51GBp701544.50XLONxHaNXdD4lPZ28-10-202511:27:51GB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