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
JPMorgan Chase & Co.
City of registered office (if applicable)
Country of registered office (if applicable)
US
4. Details of the shareholder
| Name | City of registered office | Country of registered office |
| J.P. Morgan Securities plc | | |
5. Date on which the threshold was crossed or reached
11-Sep-2025
6. Date on which Issuer notified
15-Sep-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 | 4.874076 | 1.207743 | 6.081819 | 35344734 |
| Position of previous notification (if applicable) | 5.869413 | 0.345954 | 6.215367 | |
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 | | 28325648 | | 4.874076 |
| Sub Total 8.A | 28325648 | 4.874076% | ||
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 |
| Right to recall shares lent out | n/a | n/a | 2461429 | 0.423544 |
| Sub Total 8.B1 | | 2461429 | 0.423544% | |
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 |
| Cash-settled Equity Swap | 25/09/2025 | 25/09/2025 | Cash | 0 | 0.000000 |
| Cash-settled Equity Swap | 28/11/2025 | 28/11/2025 | Cash | 206580 | 0.035545 |
| Cash-settled Equity Swap | 15/04/2026 | 15/04/2026 | Cash | 1078918 | 0.185643 |
| Cash-settled Equity Swap | 19/08/2026 | 19/08/2026 | Cash | 98 | 0.000015 |
| Cash-settled Equity Swap | 26/08/2026 | 26/08/2026 | Cash | 38102 | 0.006550 |
| Cash-settled Equity Swap | 02/09/2026 | 02/09/2026 | Cash | 8402 | 0.001434 |
| Cash-settled Equity Swap | 18/09/2026 | 18/09/2026 | Cash | 54777 | 0.009422 |
| Cash-settled Equity Swap | 24/09/2026 | 24/09/2026 | Cash | 539 | 0.000092 |
| Cash-settled Equity Swap | 01/10/2026 | 01/10/2026 | Cash | 675 | 0.000115 |
| Cash-settled Equity Swap | 06/10/2026 | 06/10/2026 | Cash | 1827150 | 0.314401 |
| Cash-settled Equity Swap | 08/10/2026 | 08/10/2026 | Cash | 88 | 0.000014 |
| Cash-settled Equity Swap | 19/10/2026 | 19/10/2026 | Cash | 21827 | 0.003755 |
| Cash-settled Equity Swap | 30/05/2028 | 30/05/2028 | Cash | 238 | 0.000040 |
| Cash-settled Equity Swap | 02/05/2030 | 02/05/2030 | Cash | 1320263 | 0.227173 |
| Sub Total 8.B2 | | 4557657 | 0.784199% | ||
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 |
| JPMorgan Chase & Co. | J.P. Morgan Securities plc | 4.874076 | | 6.081819% |
| JPMorgan Chase & Co. | J.P. Morgan SE | | | |
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
Chain of controlled undertakings:
JPMorgan Chase & Co.
JPMorgan Chase Bank, National Association (100%)
J.P. Morgan International Finance Limited (100%)
J.P. Morgan Capital Holdings Limited (100%)
J.P. Morgan Securities plc (100%)
JPMorgan Chase & Co.
JPMorgan Chase Bank, National Association (100%)
J.P. Morgan International Finance Limited (100%)
J.P. Morgan SE (100%)
12. Date of Completion
15-Sep-2025
13. Place Of Completion
London, United Kingdom
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