OSB GROUP PLC - Transaction in Own Shares

OSB GROUP PLC
ISIN: GB00BLDRH360
10 August 2026

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that, for the period from 03 August 2026 to 07 August 2026, inclusive, it had purchased a total of 416,491 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.

03 August 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	14,041	12,681	3,178	1,848
Highest price paid (per ordinary share)	571.00p	571.00p	571.00p	570.50p
Lowest price paid (per ordinary share)	562.00p	562.00p	561.50p	561.50p
Volume weighted average price paid (per ordinary share)	567.95p	567.92p	567.86p	567.99p

04 August 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	15,171	13,245	3,464	1,979
Highest price paid (per ordinary share)	570.00p	569.50p	570.00p	569.50p
Lowest price paid (per ordinary share)	559.50p	559.50p	560.00p	560.00p
Volume weighted average price paid (per ordinary share)	564.67p	564.60p	564.66p	564.67p

05 August 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	13,521	12,114	3,238	1,815
Highest price paid (per ordinary share)	570.00p	569.50p	570.00p	569.50p
Lowest price paid (per ordinary share)	564.50p	564.50p	564.50p	565.00p
Volume weighted average price paid (per ordinary share)	567.35p	567.34p	567.34p	567.49p

06 August 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	73,552	61,706	18,028	9,864
Highest price paid (per ordinary share)	509.50p	509.50p	512.00p	513.00p
Lowest price paid (per ordinary share)	482.00p	482.20p	482.00p	482.20p
Volume weighted average price paid (per ordinary share)	503.40p	503.34p	503.48p	503.51p

07 August 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	72,181	58,768	17,483	8,614
Highest price paid (per ordinary share)	521.50p	521.50p	521.50p	521.50p
Lowest price paid (per ordinary share)	504.00p	502.00p	501.50p	501.00p
Volume weighted average price paid (per ordinary share)	513.28p	513.25p	513.24p	513.10p

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 341,089,143 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting rights in the Company is 341,089,143.

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

• 2026.08.07_OSBG Buyback Fills