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Holding(s) in Company

In brief · summary, not quotable

Oasis Management Company Ltd. has increased its holding in Costain Group PLC, crossing a notification threshold on August 18, 2026. The firm now holds 11.041348% of the voting rights, primarily through financial instruments, specifically a Total Return Swap settled in cash, representing 29,121,199 voting rights. This marks an increase from their previous notification where they held 10.044690% of the voting rights through similar instruments.

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Issuer Details

ISIN

GB00B64NSP76

Issuer Name

COSTAIN GROUP PLC

UK or Non-UK Issuer

UK

Reason for Notification

An acquisition or disposal of financial instruments

Details of person subject to the notification obligation

Name

Oasis Management Company Ltd.

City of registered office (if applicable)

Central

Country of registered office (if applicable)

Hong Kong

Details of the shareholder

City of registered office (if applicable)

Country of registered office (if applicable)

Date on which the threshold was crossed or reached

18-Aug-2026

Date on which Issuer notified

20-Aug-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
Resulting situation on the date on which threshold was crossed or reached0.00000011.04134811.04134829121199
Position of previous notification (if applicable)0.00000010.04469010.044690
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)
Sub Total 8.A
8B1. Financial Instruments according to (DTR5.3.1R.(1) (a))
Type of financial instrumentExpiration dateExercise/conversion periodNumber of voting rights that may be acquired if the instrument is exercised/converted% of voting rights

Sub Total 8.B1

  • Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))
Type of financial instrumentExpiration dateExercise/conversion periodPhysical or cash settlementNumber of voting rights% of voting rights
Total Return SwapCash2912119911.041348
Sub Total 8.B22912119911.041348%
  • Information in relation to the person subject to the notification obligation
Ultimate controlling personName 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 thresholdTotal of both if it equals or is higher than the notifiable threshold
Seth Hillel Fischer11.04134811.041348%
Oasis Management Company Ltd.11.04134811.041348%
Oasis Management Holdings Ltd.11.04134811.041348%

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

  • Additional Information
  • Date of Completion

20-Aug-2026

Place Of Completion

Hong Kong

Cleaned text: letterheads, contacts and legal notices removed. View the original announcement ↗ · Company filings. Not investment advice.

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