Holding(s) in Company
Gresham House Asset Management Ltd has notified Costain Group PLC of a change in its major holding, reducing its voting rights from 5.46% to 4.70% as of September 22, 2026. This change represents a disposal of voting rights, with Gresham House Asset Management Ltd now holding 12,337,303 voting rights in Costain Group PLC.
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| 1a. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached ii : | Costain Group PLC |
- Please indicate if the issuer is a non-UK issuer (please mark with an "X" if appropriate)
Non-UK issuer
- Reason for the notification (please mark the appropriate box or boxes with an "X")
| An acquisition or disposal of voting rights | X |
An acquisition or disposal of financial instruments
An event changing the breakdown of voting rights
Other (please specify) iii :
Details of person subject to the notification obligation iv
| Name | Gresham House Asset Management Ltd |
| City and country of registered office (if applicable) | London, UK |
Full name of shareholder(s) (if different from 3.) v
Name
| City and country of registered office (if applicable) | London, UK |
| 5. Date on which the threshold was crossed or reached vi : | 22/09/2026 |
| 6. Date on which issuer notified (DD/MM/YYYY): | 23/09/2026 |
- 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 (8.A + 8.B) vii | |
|---|---|---|---|---|
| Resulting situation on the date on which threshold was crossed or reached | 4.70% | 4.70% | 12,337,303 | |
| Position of previous notification (if applicable) | 5.46% | 5.46% | ||
| A: Voting rights attached to shares | ||||
| Class/type of shares ISIN code (if possible) | Number of voting rights ix | % of voting rights | ||
| Direct (DTR5.1) | Indirect (DTR5.2.1) | Direct (DTR5.1) | Indirect (DTR5.2.1) | |
| GB00B64NSP76 | 12,337,303 | 4.70% | ||
| SUBTOTAL 8. A | 12,337,303 | 4.70% | ||
| B 1: Financial Instruments according to DTR5.3.1R (1) (a) | ||||
| Type of financial instrument | Expiration date x | Exercise/ Conversion Period xi | Number of voting rights that may be acquired if the instrument is exercised/converted. | % of voting rights |
SUBTOTAL 8. B 1
B 2: Financial Instruments with similar economic effect according to DTR5.3.1R (1) (b)
| Type of financial instrument | Expiration date x | Exercise/ Conversion Period xi | Physical or cash Settlement xii | Number of voting rights | % of voting rights |
| SUBTOTAL 8.B.2 | |||||
| Name xv | % 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 | ||
| Gresham House Asset Management Limited | 4.70% | 4.70% | |||
| 10. In case of proxy voting, please identify: | |||||
| Name of the proxy holder | Gresham House Asset Management Ltd | ||||
| The number and % of voting rights held | N/A | ||||
| The date until which the voting rights will be held | N/A | ||||
| 11. Additional information xvi | |||||
| Place of completion | Gresham House Asset Management Ltd | ||||
| Date of completion | 23/09/2026 | ||||
Notes
Name of ultimate controlling person A (chain 1)
Name of controlled undertaking B
Name of controlled undertaking C
Name of ultimate controlling person A (chain 2)
Name of controlled undertaking B
Name of controlled undertaking D
Name of ultimate controlling person A (chain3)
Name of controlled undertaking E
Name of controlled undertaking F
xvi Example: Correction of a previous notification.
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