Holding(s) in Company

    Holding(s) in Company 

TR-1: Standard form for notification of major holdings

1. Issuer Details ISIN GB00BLDRH360 Issuer Name OSB GROUP PLC UK or Non-UK Issuer UK 2. Reason for Notification An acquisition or disposal of voting rights 3. Details of person subject to the notification obligation Name BlackRock, Inc. City of registered office (if applicable) Wilmington Country of registered office (if applicable) USA 4. Details of the shareholder 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)

5. Date on which the threshold was crossed or reached 12-Oct-2022 6. Date on which Issuer notified 13-Oct-2022 7. Total positions of person(s) subject to the notification obligation

.	% of voting rights attached to shares (total of 8.A)	% of voting rights through financial instruments (total of 8.B 1 + 8.B 2)	Total of both in % (8.A + 8.B)	Total number of voting rights held in issuer
Resulting situation on the date on which threshold was crossed or reached	4.780000	0.470000	5.250000	22915849
Position of previous notification (if applicable)	5.710000	0.860000	6.580000

8. Notified details of the resulting situation on the date on which the threshold was crossed or reached 8A. 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		20822484		4.780000
Sub Total 8.A	20822484		4.780000%

8B1. 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
Securities Lending			1522455	0.340000
Sub Total 8.B1			1522455	0.340000%

8B2. 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
CFD			Cash	570910	0.130000
Sub Total 8.B2				570910	0.130000%

9. 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 notifiable threshold	% of voting rights through financial instruments if it equals or is higher than the notifiable threshold	Total of both if it equals or is higher than the notifiable threshold
BlackRock, Inc. (Chain 1)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 1)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 1)	BlackRock International Holdings, Inc.
BlackRock, Inc. (Chain 1)	BR Jersey International Holdings L.P.
BlackRock, Inc. (Chain 1)	BlackRock Holdco 3, LLC
BlackRock, Inc. (Chain 1)	BlackRock Cayman 1 LP
BlackRock, Inc. (Chain 1)	BlackRock Cayman West Bay Finco Limited
BlackRock, Inc. (Chain 1)	BlackRock Cayman West Bay IV Limited
BlackRock, Inc. (Chain 1)	BlackRock Group Limited
BlackRock, Inc. (Chain 1)	BlackRock Finance Europe Limited
BlackRock, Inc. (Chain 1)	BlackRock Investment Management (UK) Limited
BlackRock, Inc. (Chain 2)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 2)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 2)	BlackRock International Holdings, Inc.
BlackRock, Inc. (Chain 2)	BR Jersey International Holdings L.P.
BlackRock, Inc. (Chain 2)	BlackRock Australia Holdco Pty. Ltd.
BlackRock, Inc. (Chain 2)	BlackRock Investment Management (Australia) Limited
BlackRock, Inc. (Chain 3)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 3)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 3)	BlackRock Holdco 4, LLC
BlackRock, Inc. (Chain 3)	BlackRock Holdco 6, LLC
BlackRock, Inc. (Chain 3)	BlackRock Delaware Holdings Inc.
BlackRock, Inc. (Chain 3)	BlackRock Institutional Trust Company, National Association
BlackRock, Inc. (Chain 4)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 4)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 4)	BlackRock Holdco 4, LLC
BlackRock, Inc. (Chain 4)	BlackRock Holdco 6, LLC
BlackRock, Inc. (Chain 4)	BlackRock Delaware Holdings Inc.
BlackRock, Inc. (Chain 4)	BlackRock Fund Advisors
BlackRock, Inc. (Chain 5)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 5)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 6)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 6)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 6)	BlackRock International Holdings, Inc.
BlackRock, Inc. (Chain 6)	BR Jersey International Holdings L.P.
BlackRock, Inc. (Chain 6)	BlackRock Holdco 3, LLC
BlackRock, Inc. (Chain 6)	BlackRock Cayman 1 LP
BlackRock, Inc. (Chain 6)	BlackRock Cayman West Bay Finco Limited
BlackRock, Inc. (Chain 6)	BlackRock Cayman West Bay IV Limited
BlackRock, Inc. (Chain 6)	BlackRock Group Limited
BlackRock, Inc. (Chain 6)	BlackRock Finance Europe Limited
BlackRock, Inc. (Chain 6)	BlackRock (Netherlands) B.V.
BlackRock, Inc. (Chain 6)	BlackRock Asset Management Deutschland AG
BlackRock, Inc. (Chain 7)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 7)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 7)	BlackRock International Holdings, Inc.
BlackRock, Inc. (Chain 7)	BR Jersey International Holdings L.P.
BlackRock, Inc. (Chain 7)	BlackRock Holdco 3, LLC
BlackRock, Inc. (Chain 7)	BlackRock Canada Holdings LP
BlackRock, Inc. (Chain 7)	BlackRock Canada Holdings ULC
BlackRock, Inc. (Chain 7)	BlackRock Asset Management Canada Limited
BlackRock, Inc. (Chain 8)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 8)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 8)	BlackRock Capital Holdings, Inc.
BlackRock, Inc. (Chain 8)	BlackRock Advisors, LLC
BlackRock, Inc. (Chain 9)	BlackRock Holdco 2, Inc.
BlackRock, Inc. (Chain 9)	BlackRock Financial Management, Inc.
BlackRock, Inc. (Chain 9)	BlackRock International Holdings, Inc.
BlackRock, Inc. (Chain 9)	BR Jersey International Holdings L.P.
BlackRock, Inc. (Chain 9)	BlackRock Holdco 3, LLC
BlackRock, Inc. (Chain 9)	BlackRock Cayman 1 LP
BlackRock, Inc. (Chain 9)	BlackRock Cayman West Bay Finco Limited
BlackRock, Inc. (Chain 9)	BlackRock Cayman West Bay IV Limited
BlackRock, Inc. (Chain 9)	BlackRock Group Limited
BlackRock, Inc. (Chain 9)	BlackRock Finance Europe Limited
BlackRock, Inc. (Chain 9)	BlackRock Advisors (UK) Limited

10. In case of proxy voting Name of the proxy holder

The number and % of voting rights held

The date until which the voting rights will be held

11. Additional Information BlackRock Regulatory Threshold Reporting TeamJana Blumenstein020 7743 3650 12. Date of Completion 13th October 202213. Place Of Completion 12 Throgmorton Avenue, London, EC2N 2DL, U.K.