Holding(s) in Company

In brief · summary, not quotable

Aberdeen Group plc has notified Corero Network Security PLC that its total voting rights now stand at 5.299028%, representing 27,139,775 shares. This notification is due to a change in portfolio management responsibilities for Herald Investment Trust plc, effective August 1, 2026, which resulted in abrdn Investments Limited holding delegated voting rights above the 5% threshold. No underlying shares were acquired or disposed of in this transaction.

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Issuer Details

ISIN

GB00B54X0432

Issuer Name

CORERO NETWORK SECURITY PLC

UK or Non-UK Issuer

UK

Reason for Notification

An acquisition or disposal of voting rights

Details of person subject to the notification obligation

Name

Aberdeen Group plc

City of registered office (if applicable)

Edinburgh

Country of registered office (if applicable)

United Kingdom

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

03-Aug-2026

Date on which Issuer notified

05-Aug-2026

Total positions of person(s) subject to the notification obligation

Resulting situation on the date on which threshold was crossed or reached	5.299028	0.000000	5.299028	27,139,775
Position of previous notification (if applicable)		N/A	N/A	N/A
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)
GB00B54X0432			27,139,775	5.299028
Sub Total 8.A			27,139,775	5.299028

Financial Instruments according to (DTR5.3.1R.(1) (a))

Sub Total 8.B1

Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))

Sub Total 8.B2

Information in relation to the person subject to the notification obligation

Aberdeen Group plc

			Aberdeen Group plc	abrdn Holdings Limited
Aberdeen Group plc	abrdn Investments Limited	5.299028	0.000000	5.299028

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

This disclosure also reflects the fact that the voting rights effectively held indirectly by the underlying intermediate holding company abrdn Holdings Limited ("aHL") and held by the underlying investment management entity abrdn Investments Limited ("aIL") increased above the 5% notifiable threshold. aHL now effectively holds and aIL holds the delegated voting rights to 5.299028% of the shares in Corero Network Security PLC.