OSB GROUP PLC - Holding(s) in Company

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September 14, 2026 6:15 AM EDT

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TR-1: Standard form for notification of major holdings

01. Issuer Details

ISIN

GB00BLDRH360

Issuer Name

OSB GROUP PLC

UK or Non-UK Issuer

02. Reason for Notification

An acquisition or disposal of voting rights

03. Details of person subject to the notification obligation

Name

Lorentzweiler Adjacent Partners S.C.Sp

City of registered office (if applicable)

Howald

Country of registered office (if applicable)

Luxembourg

04. Details of the sharholder

Full name of shareholder(s) if different from the person(s) subject to the notification obligation, above

City of registered office (if applicable)

Country of registered office (if applicable)

05. Date on which the threshold was crossed or reached

09-Sep-2026

06. Date on which Issuer notified

11-Sep-2026

07. Total positions of person(s) subject to the notification obligation

% of voting rights attached

% of voting rights through financial

Total of both in % (8.A + 8.B)

Total number of voting rights held in issuer

	to shares (total of 8.A)	instruments (total of 8.B 1 + 8.B 2)
Resulting situation on the date on which threshold was crossed or reached	4.019900	0.000000	4.019900	13637487
Position of previous notification (if applicable)	3.096900	0.000000	3.096900

08. Notified details of the resulting situation on the date on which the threshold was crossed or reached

08A. Voting rights attached to shares

Class/Type of shares ISIN code(if possible)	Number of direct voting rights (DTR5.1)	Number of indirect voting rights (DTR5.2.1)	% of direct voting rights (DTR5.1)	% of indirect voting rights (DTR5.2.1)
GB00BLDRH360	13637487	0	4.019900	0.000000
Sub Total 8.A	13637487		4.019900%

08B1. Financial Instruments according to (DTR5.3.1R.(1) (a))

Type of financial instrument	Expiration date	Exercise/conversion period	Number of voting rights that may be acquired if the instrument is exercised/converted	% of voting rights
Sub Total 8.B1

08B2. Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))

Type of financial instrument	Expiration date	Exercise/conversion period	Physical or cash settlement	Number of voting rights	% of voting rights
Sub Total 8.B2

09. Information in relation to the person subject to the notification obligation

2. Full chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entities (please add additional rows as necessary)

Ultimate controlling person

Name of controlled undertaking

% of voting rights if it equals or is higher than the

% of voting rights through financial instruments if it equals or is

Total of both if it equals or is higher than the notifiable threshold

		notifiable threshold	higher than the notifiable threshold
Alan Waxman		3.096900		3.096900%
Alan Waxman	Sixth Street Partners Management Company, L.P.	3.096900		3.096900%
Alan Waxman	TAO Finance 3, LLC	1.858100		1.858100%
Alan Waxman	Beacon Finance 3, LLC	0.619400		0.619400%
Alan Waxman	Sixth Street Madrone Strategic Holdings I, L.P	0.619400		0.619400%
Alan Waxman	Lorentzweiler Adjacent Partners, S.C.Sp (acting through its general partner, Lorentzweiler Adjacent Investments, S.à r.l.)	3.096900		3.096900%
Alan Waxman		4.019900		4.019900%
Alan Waxman	Sixth Street Partners Management Company, L.P.	4.019900		4.019900%
Alan Waxman	TAO Finance 3, LLC	2.411900		2.411900%
Alan Waxman	Beacon Finance 3, LLC	0.804000		0.804000%

Alan Waxman	Sixth Street Madrone Strategic Holdings I, L.P	0.804000		0.804000%
Alan Waxman	Lorentzweiler Adjacent Partners, S.C.Sp (acting through its general partner, Lorentzweiler Adjacent Investments, S.à r.l.)	4.019900		4.019900%