Spirent Communications PLC

Major Shareholding Notification • Oct 17, 2025

National Storage Mechanism | Additional information

RNS Number : 7518D

Spirent Communications PLC

16 October 2025

TR-1: Standard form for notification of major holdings

1. Issuer Details

ISIN

GB0004726096

Issuer Name

SPIRENT COMMUNICATIONS 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

Morgan Stanley

City of registered office (if applicable)

Country of registered office (if applicable)

US

Name	City of registered office	Country of registered office
Morgan Stanley	Wilmington, Delaware	USA

4. Details of the shareholder

Name	City of registered office	Country of registered office
Morgan Stanley & Co. International plc	London	UNITED KINGDOM

5. Date on which the threshold was crossed or reached

14-Oct-2025

6. Date on which Issuer notified

16-Oct-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	9.348027	0.085873	9.433900	55640948
Position of previous notification (if applicable)	10.683456	0.202381	10.885837

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)
GB0004726096		55134467		9.348027
Sub Total 8.A	55134467		9.348027%

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
Equity Swap	31/07/2026	at any time	Cash	50000	0.008477
Equity Swap	05/02/2027	at any time	Cash	456481	0.077396
Sub Total 8.B2				506481	0.085873%

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
Morgan Stanley (Chain 1)
Morgan Stanley (Chain 1)	Morgan Stanley Capital Management, LLC
Morgan Stanley (Chain 1)	Morgan Stanley Domestic Holdings, LLC
Morgan Stanley (Chain 1)	Morgan Stanley Capital Services LLC
Morgan Stanley (Chain 2)
Morgan Stanley (Chain 2)	Morgan Stanley International Holdings Inc.
Morgan Stanley (Chain 2)	Morgan Stanley International Limited
Morgan Stanley (Chain 2)	Morgan Stanley Investments (UK)
Morgan Stanley (Chain 2)	Morgan Stanley & Co. International plc	9.348026		9.421493%
Morgan Stanley (Chain 3)
Morgan Stanley (Chain 3)	Morgan Stanley Capital Management, LLC
Morgan Stanley (Chain 3)	Morgan Stanley Smith Barney LLC

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

12. Date of Completion

16-Oct-2025

13. Place Of Completion

Glasgow

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