OSB Group PLC

Share Issue/Capital Change • Dec 1, 2025

National Storage Mechanism | Additional information

LEI: 213800ZBKL9BHSL2K459

BLOCK LISTING SIX MONTHLY RETURN

Information provided on this form must be typed or printed electronically and provided to an ris.

(Note: Italicised terms have the same meaning as given in the Listing Rules.)

Date: 01 December 2025

Name of applicant:		OSB GROUP PLC
Name of schemes:		1. Sharesave Scheme 2. Deferred Share Bonus Plan 3. Performance Share Plan
Period of return:	From:	1 June 2025	To:	30 November 2025
Balance of unallotted securities under scheme(s) from previous return:		1. 1,220,102 Ordinary Shares of £0.01 each 2. 377,056 Ordinary Shares of £0.01 each 3. 2,495,577 Ordinary Shares of £0.01 each
Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):		1. 0 Ordinary Shares of £0.01 each 2. 0 Ordinary Shares of £0.01 each 3. 0 Ordinary Shares of £0.01 each
Less: Number of securities issued/allotted under scheme(s) during period (see LR3.5.7G):		1. 49,053 Ordinary Shares of £0.01 each 2. 24,954 Ordinary Shares of £0.01 each 3. 0 Ordinary Shares of £0.01 each
Equals: Balance under scheme(s) not yet issued/allotted at end of period:		1. 1,171,049 Ordinary Shares of £0.01 each 2. 352,102 Ordinary Shares of £0.01 each 3. 2,495,577 Ordinary Shares of £0.01 each

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