Holding(s) in Company

RNS Number : 9937X

Spirent Communications PLC

25 August 2009


TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:		Spirent Communications PLC
2 Reason for the notification (please tick the appropriate box or boxes):
An acquisition or disposal of voting rights			X
An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached
An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments
An event changing the breakdown of voting rights
Other (please specify):
3. Full name of person(s) subject to the notification obligation:	Prudential plc group of companies
4. Full name of shareholder(s) (if different from 3.):	JP MORGAN NOMINEES NORTRUST NOMINEE LTD A/C MHF01 NORTRUST NOMINEE LTD A/C MKM01 NORTRUST NOMS LTD NORTRUST NOMS LTD A/C PUF01 NORTRUST NOMS LTD A/C PUI01 NORTRUST NOMS LTD A/C PUQ01 NORTRUST NOMS LTD A/C PUR01 PRUCLT HSBC GIS NOM(UK) PAC AC PRUCLT HSBC GIS NOM(UK) PPL AC
5. Date of the transaction and date on which the threshold is crossed or reached:	24 August 2009
6. Date on which issuer notified:	25 August 2009
7. Threshold(s) that is/are crossed or reached:	12%

8. Notified details:

A: Voting rights attached to shares

Class/type of
shares

if possible using
the ISIN CODE

Situation previous
to the triggering
transaction

Resulting situation after the triggering transaction

Number
of
Shares

Number
of
Voting
Rights

Number
of shares

Number of voting
rights

% of voting rights

Direct

Indirect

Direct

Indirect

GB0004726096

80,627,982

80,846,282

12.00%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

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

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial
instrument

Exercise price

Expiration date

Exercise/
Conversion period

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

80,846,282

12.00%

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:
Prudential plc (parent Company) M&G Group Limited (wholly owned subsidiary of Prudential plc) M&G Limited (wholly owned subsidiary of M&G Group Limited) M&G Investment Management Limited (wholly owned subsidiary of M&G Limited) The Prudential Assurance Company Limited (wholly owned subsidiary of Prudential plc)

Proxy Voting:
10. Name of the proxy holder:		N/A
11. Number of voting rights proxy holder will cease to hold:		N/A
12. Date on which proxy holder will cease to hold voting rights:		N/A

13. Additional information:	Calculations based on a Total Voting Rights figure of 673,305,434.
14. Contact name:	Dipesh Varsani / Mark Thomas M&G Investment Management Limited
15. Contact telephone number:	020 7548 3261 / 020 7548 3266