OSB GROUP PLC - Transaction in Own Shares

OSB GROUP PLC
ISIN: GB00BLDRH360
16 March 2026

LEI number: 213800ZBKL9BHSL2K459

OSB GROUP PLC (the “Company”)
Share Buyback Programme – Transactions in Own Shares

The Company announces that, for the period from 09 March 2026 to 13 March 2026, inclusive, it had purchased a total of 718,201 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.

09 March 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	68,169	57,183	23,802	9,354
Highest price paid (per ordinary share)	568.50p	568.50p	568.50p	568.00p
Lowest price paid (per ordinary share)	550.00p	550.00p	550.00p	550.00p
Volume weighted average price paid (per ordinary share)	563.63p	563.59p	563.61p	563.67p

10 March 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	45,937	38,406	15,998	6,337
Highest price paid (per ordinary share)	588.50p	588.0000p	588.50p	588.00p
Lowest price paid (per ordinary share)	577.00p	577.00p	576.50p	576.50p
Volume weighted average price paid (per ordinary share)	581.15p	581.13p	581.12p	581.22p

11 March 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	69,415	55,527	23,456	9,055
Highest price paid (per ordinary share)	578.50p	578.00p	578.00p	578.00p
Lowest price paid (per ordinary share)	570.00p	569.50p	570.00p	571.00p
Volume weighted average price paid (per ordinary share)	573.42p	573.57p	573.45p	573.50p

12 March 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	62,173	49,913	20,967	7,672
Highest price paid (per ordinary share)	574.50p	574.50p	574.50p	574.00p
Lowest price paid (per ordinary share)	565.00p	565.00p	565.00p	565.00p
Volume weighted average price paid (per ordinary share)	569.64p	569.72p	569.67p	569.67p

13 March 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	68,419	54,908	23,068	8,442
Highest price paid (per ordinary share)	570.50p	570.50p	570.50p	570.50p
Lowest price paid (per ordinary share)	555.00p	556.00p	557.50p	560.00p
Volume weighted average price paid (per ordinary share)	566.96p	567.00p	567.08p	567.08p

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 351,850,774 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting rights in the Company is 351,850,774.

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

• 2026.03.13_OSBG Buyback Fills