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
JPMorgan Asset Management Holdings Inc.
City of registered office (if applicable)
Wilmington
Country of registered office (if applicable)
United States of America
4. Details of the shareholder

Name	City of registered office	Country of registered office
JPMorgan Asset Management (UK) Limited	London	United kingdom

5. Date on which the threshold was crossed or reached
04-Dec-2025
6. Date on which Issuer notified
05-Dec-2025
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	5.009530%	0.257502%	5.267032%	18,779,539
Position of previous notification (if applicable)	4.994687%	0.262225%	5.256912%

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		17,861,414		5.009530%
Sub Total 8.A	17,861,414		5.009530%

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
Cash Settled – Equity Swaps	N/A	N/A	Cash	918,125	0.257502%
Sub Total 8.B2				918,125	0.257502%

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
JPMorgan Asset Management Holdings Inc	JPMorgan Asset Management (UK) Limited			5.033731%
JPMorgan Asset Management Holdings Inc	J.P. Morgan Investment Management Inc.
JPMorgan Asset Management Holdings Inc.	JPMorgan Asset Management (Japan) Limited
JPMorgan Asset Management Holdings Inc	J.P. Morgan Alternative Asset Management, Inc
JPMorgan Asset Management Holdings Inc.	JPMorgan Asset Management (Asia Pacific) Limited
JPMorgan Asset Management Holdings Inc.	JPMorgan Asset Management (Singapore) 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
Chain of controlled undertakings:

JPMorgan Asset Management Holdings Inc
JPMorgan Asset Management International Limited (100%)
JPMorgan Asset Management (UK) Limited (100%)

JPMorgan Asset Management Holdings Inc
J.P. Morgan Investment Management Inc. (100%)

JPMorgan Asset Management Holdings Inc
JPMorgan Asset Management (Asia) Inc. (100%)
JPMorgan Asset Management (Japan) Limited (100%)

JPMorgan Asset Management Holdings Inc
J.P. Morgan Alternative Asset Management, Inc. (100%)

JPMorgan Asset Management Holdings Inc.
JPMorgan Asset Management (Asia) Inc. (100%)
JPMorgan Asset Management (Asia Pacific) Limited (100%)

JPMorgan Asset Management Holdings Inc.
JPMorgan Asset Management (Asia) Inc. (100%)
JPMorgan Asset Management (Singapore) Limited (100%)
12. Date of Completion
05-Dec-2025
13. Place Of Completion
Hyderabad, India