REG-Holding(s) in Company

OsbAnnouncement

27/01/2026 16:30

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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 
Dimensional Fund Advisors LP 
City of registered office (if applicable) 
Austin 
Country of registered office (if applicable) 
USA 
4. Details of the shareholder

 Name                                                                                           City of registered office  Country of registered office  
 Funds and accounts managed by Dimensional Fund Advisors LP and/or its subsidiary undertakings                                                           

5. Date on which the threshold was crossed or reached 
22-Jan-2026 
6. Date on which Issuer notified 
26-Jan-2026 
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  5.003594                                              0.000000                                                                   5.003594                        17769925                                      
 Position of previous notification (if applicable)                                                                                                                                                                                                                                         

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                                                                          17769925                                                                         5.003594                                
 Sub Total 8.A                                17769925                                                                              5.003594%                                                                   

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  
                                                                                                                                                                                       
 Sub Total 8.B1                                                                                                                                                                        

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  
                                                                                                                                                      
 Sub Total 8.B2                                                                                                                                       

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  
 Dimensional Holdings Inc.    i) Dimensional Fund Advisors Ltd., (ii) DFA Australia Limited (iii) Dimensional Ireland Limited (iv) Dimensional Fund Advisors Canada ULC (v) Dimensional Fund Advisors Pte. Ltd. and (vi) Dimensional Fund Advisors LP                                                                                                                                                                                                                                                               

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 
The ordinary shares are held in segregated accounts and funds (together, the
“Accounts”) managed on a discretionary basis by Dimensional Fund Advisors
LP ("Dimensional") and its subsidiary undertakings i) Dimensional Fund
Advisors Ltd., (ii) DFA Australia Limited (iii) Dimensional Ireland Limited
(iv) Dimensional Fund Advisors Canada ULC (v) Dimensional Fund Advisors Pte.
Ltd. and (vi) Dimensional Fund Advisors LP. 

As at 22 January 2026, Dimensional also had investment management discretion
over an additional 48,869 shares where the voting rights are not controlled by
Dimensional or its subsidiary undertakings.

Dimensional is controlled by its general partner, Dimensional Holdings Inc. 

Dimensional, on behalf of itself and its subsidiary undertakings, expressly
disclaims beneficial ownership of the shares held in the Accounts. 
12. Date of Completion 
26-Jan-2026 
13. Place Of Completion 
Paris