OSB GROUP PLC - Transaction in Own Shares

OSB GROUP PLC
ISIN: GB00BLDRH360
20 April 2026

LEI number: 213800ZBKL9BHSL2K459

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

The Company announces that, for the period from 13 April 2026 to 17 April 2026, inclusive, it had purchased a total of 706,075 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.

13 April 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	60,289	48,860	14,463	6,568
Highest price paid (per ordinary share)	548.50p	548.00p	548.50p	548.00p
Lowest price paid (per ordinary share)	543.00p	543.50p	543.50p	543.50p
Volume weighted average price paid (per ordinary share)	545.91p	545.93p	545.92p	545.96p

14 April 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	67,555	54,556	15,598	7,334
Highest price paid (per ordinary share)	556.50p	556.50p	557.00p	556.50p
Lowest price paid (per ordinary share)	548.50p	548.50p	549.50p	552.00p
Volume weighted average price paid (per ordinary share)	554.27p	554.26p	554.28p	554.45p

15 April 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	67,471	54,482	15,578	7,346
Highest price paid (per ordinary share)	561.00p	560.50p	561.00p	557.50p
Lowest price paid (per ordinary share)	554.00p	554.00p	554.00p	553.50p
Volume weighted average price paid (per ordinary share)	555.79p	555.81p	555.77p	555.76p

16 April 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	67,506	55,014	15,720	7,410
Highest price paid (per ordinary share)	564.00p	564.00p	564.00p	564.00p
Lowest price paid (per ordinary share)	553.50p	553.50p	553.50p	553.50p
Volume weighted average price paid (per ordinary share)	558.98p	558.97p	558.94p	558.92p

17 April 2026	London Stock Exchange	CBOE BXE	CBOE CXE	Aquis Exchange
Number of ordinary shares purchased	62,910	55,118	15,107	7,190
Highest price paid (per ordinary share)	568.50p	568.50p	569.00p	568.50p
Lowest price paid (per ordinary share)	552.00p	552.00p	552.00p	552.50p
Volume weighted average price paid (per ordinary share)	559.72p	559.73p	559.84p	559.90p

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 350,315,592 ordinary shares.

No ordinary shares are held in treasury. Therefore, the total number of voting rights in the Company is 350,315,592.

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

• 2026.04.17_OSBG Buyback Fills