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
Lorentzweiler Adjacent Partners S.C.Sp.
City of registered office (if applicable)
Howald
Country of registered office (if applicable)
Luxembourg
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
15-Sep-2026
6. Date on which Issuer notified
16-Sep-2026
7. 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 | 5.087900 | 0.000000 | 5.087900 | 17238397 |
| Position of previous notification (if applicable) | 4.019900 | 0.000000 | 4.019900 |
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 | 17238397 | 0 | 5.087900 | 0.000000 |
| Sub Total 8.A | 17238397 | 5.087900% | ||
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 | % 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% | |
| Alan Waxman | 5.087900 | 5.087900% | ||
Alan Waxman | Sixth Street Partners Management Company, L.P. | 5.087900 | 5.087900% | |
| Alan Waxman | TAO Finance 3, LLC | 3.052800 | 3.052800% | |
| Alan Waxman | Beacon Finance 3, LLC | 1.017600 | 1.017600% | |
Alan Waxman | Sixth Street Madrone Strategic Holdings I, L.P | 1.017600 | 1.017600% | |
Alan Waxman | Lorentzweiler Adjacent Partners, S.C.Sp (acting through its general partner, Lorentzweiler Adjacent Investments, S.à r.l.) | 5.087900 | 5.087900% |
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 If date does not apply, explain below
11. Additional Information
12. Date of Completion
16-Sep-2026
13. Place Of Completion
Luxembourg
