RNS Number : 1349U

Spirent Communications PLC

13 October 2014



TR-1: Notifications of Major Interests 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 notification (yes/no)
An acquisition or disposal of voting rights			Yes
An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached			No
An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments			No
An event changing the breakdown of voting rights			No
Other (please specify):___________________________			No
3. Full name of person(s) subject to notification obligation:	Ameriprise Financial, Inc. and its group
4. Full name of shareholder(s) (if different from 3):	See additional information under 13.
5. Date of transaction and date on which the threshold is crossed or reached:	09 October 2014
6. Date on which issuer notified:	10 October 2014
7. Threshold(s) that is/are crossed or reached:	Above the threshold of 11%

8: Notified Details
A: Voting rights attached to shares
Class/type of shares If possible use 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		Percentage of voting rights
			Direct	Direct	Indirect	Direct	Indirect
GB0004726096        67,245,106 67,245,106 347,118 347,118 71,483,326 0.057%                         11.685%

B: Qualifying Financial Instruments
Resulting situation after the triggering transaction
Type of financial instrument	Expiration date	Exercise/ conversion period	No. of voting rights that may be acquired if the instrument is exercised/converted.	Percentage 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	No. of voting rights instrument refers to	Percentage of voting rights
					Nominal	Delta

Total (A+B+C)
Number of voting rights	Percentage of voting rights
71,830,444	11.742%

9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively held, if applicable:

Ameriprise Financial, Inc., which through intermediate holding companies controls the voting rights of Columbia Management Investment Advisers, Columbia Wanger Asset Management, Threadneedle Management Luxembourg S.A. and Threadneedle Asset Management Holdings Ltd, which itself controls the voting rights of Threadneedle Asset Management Ltd, Threadneedle International Ltd and Threadneedle Pensions Ltd.

Proxy Voting:
10. Name of 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:

Registered Owner

Littledown Nominees Ltd	A/c 41407	21,006,553
HSBC Global Custody Nominee (UK) Limited	A/c 740190	170,354
HSBC Global Custody Nominee (UK) Limited	A/c 739874	632,702
HSBC Global Custody Nominee (UK) Limited	A/c 740311	87,889
State Street Nominees Limited	A/c 2GQ6	30,235,269
Littledown Nominees Ltd	A/c ZLA05	1,148,601
Littledown Nominees Ltd	A/c ZLA07	6,398,452
Littledown Nominees Ltd	A/c 07197	347,118
Littledown Nominees Ltd	A/c 10479	14,716
Littledown Nominees Ltd	A/c ZLA12	237,536
Littledown Nominees Ltd	A/c ZLA14	70,131
Littledown Nominees Ltd	A/c 34789	564,903
Littledown Nominees Ltd	A/c 18667	3,019,998
Littledown Nominees Ltd	A/c 10492	6,654,616
Littledown Nominees Ltd	A/c 10488	1,241,606

14 Contact name:

Mark Powney, Threadneedle Group

15. Contact telephone name:

01793 363135

C: Additional information

Contact at Issuer: Michelle Balch, Assistant Company Secretary, Spirent Communications plc

Telephone: 01293 767676

This information is provided by RNS

The company news service from the London Stock Exchange

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