SOURCE: Spirent PLC

March 28, 2006 08:20 ET

SPIRENT PLC ANNOUNCES NOTIFICATION OF MAJOR INTERESTS IN SHARES

Crawley, UK -- (MARKET WIRE) -- March 28, 2006 --

              NOTIFICATION OF MAJOR INTERESTS IN SHARES 

1. Name of listed company

SPIRENT PLC

2. Name of shareholder with a major interest

BARCLAYS PLC

3. Please state whether notification indicates that regarding the holding of the shareholder named in 2 above; in respect of a non-beneficial interest; or in the case of an individual holder if it is a holding of that person's spouse or children under the age of 18

SHAREHOLDER IN 2 ABOVE

4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them

                                                                      
  Registered Holder                 Account Designation       Holding 

  BARCLAYS CAPITAL NOMINEES                                  -126,801 
  LIMITED                                                             
  BARCLAYS CAPITAL NOMINEES                                   -76,469 
  LIMITED                                                             
  BARCLAYS CAPITAL NOMINEES                                   554,239 
  LIMITED                                                             
  BARCLAYS CAPITAL NOMINEES                                 2,003,740 
  LIMITED                                                             
  Barclays Trust Co & Others                                    8,077 
  BNP PARIBAS                                                  51,000 
  BOISS NOMINEES LTD                            4224361       594,977 
  CHASE NOMINEES LTD                              16376       527,631 
  CHASE NOMINEES LTD                              20947    29,775,272 
  CHASE NOMINEES LTD                              21359     1,483,196 
  CHASE NOMINEES LTD                              28270       307,679 
  CHASE NOMINEES LTD                              28270       908,176 
  CIBC MELLON GLOBAL SECURITIES                                42,140 
  Gerrard Nominees Limited                       642367        13,000 
  Gerrard Nominees Limited                       650668        13,000 
  Gerrard Nominees Limited                       653035        13,000 
  Gerrard Nominees Limited                       660632         6,000 
  Gerrard Nominees Limited                       660758        35,000 
  Gerrard Nominees Limited                       660851        30,000 
  Greig Middleton Nominees                                    200,787 
  Limited (GM1)                                                       
  INVESTORS BANK AND TRUST CO.                                221,432 
  INVESTORS BANK AND TRUST CO.                                 22,464 
  INVESTORS BANK AND TRUST CO.                                 56,359 
  INVESTORS BANK AND TRUST CO.                              1,770,097 
  INVESTORS BANK AND TRUST CO.                                699,748 
  INVESTORS BANK AND TRUST CO.                                 54,686 
  JP MORGAN (BGI CUSTODY)                         16331       268,775 
  JP MORGAN (BGI CUSTODY)                         16341     2,160,554 
  JP MORGAN (BGI CUSTODY)                         16341       560,581 
  JP MORGAN (BGI CUSTODY)                         16344       687,727 
  JP MORGAN (BGI CUSTODY)                         16345     1,158,601 
  JP MORGAN (BGI CUSTODY)                         16400     9,479,907 
  JP MORGAN (BGI CUSTODY)                         18409       791,821 
  JPMorgan Chase Bank                                         555,319 
  JPMorgan Chase Bank                                         399,337 
  Mellon Trust - US CUSTODIAN /                                81,846 
  MELLON TRUST OF NEW ENGLAND                                  81,368 
  NORTHERN TRUST BANK - BGI SEPA                              136,835 
  NORTHERN TRUST BANK - BGI SEPA                              120,848 
  NORTHERN TRUST BANK - BGI SEPA                               35,400 
  R C Greig Nominees Limited                                  921,916 
  R C Greig Nominees Limited a/c                              705,551 
  AK1                                                                 
  R C Greig Nominees Limited a/c                               97,464 
  BL1                                                                 
  R C Greig Nominees Limited a/c                               24,646 
  CM1                                                                 
  R C Greig Nominees Limited GP1                               50,096 
  R C Greig Nominees Limited SA1                               31,232 
  STATE STREET TRUST OF CANADA -                               77,145 
  The Northern Trust Company - U                               54,943 
  Total                                                    57,670,342 

5. Number of shares / amount of stock acquired

-

6. Percentage of issued class (any treasury shares held by the listed company should not be taken into account when calculating percentage)

-

7. Number of shares / amount of stock disposed

NOT KNOWN

8. Percentage of issued class (any treasury shares held by the listed company should not be taken into account when calculating percentage)

NOT KNOWN

9. Class of security

ORDINARY SHARES OF 3.3333 PENCE EACH

10. Date of transaction

HOLDING AS AT 23 MARCH 2006

11. Date company informed

28 MARCH 2006

12. Total holding following this notification

57,670,342

13. Total percentage holding of issued class following this notification (any treasury shares held by the listed company should not be taken into account when calculating percentage)

5.95%

14. Any additional information

SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 105,727,030 (10.91%) ON 14 MARCH 2006.

15. Name of contact and telephone number for queries

MICHAEL ANSCOMBE - 01293 767672

16. Name and signature of duly authorised company official of the listed company responsible for making this notification

MICHAEL ANSCOMBE - DEPUTY COMPANY SECRETARY

Date of notification

28 MARCH 2006

 
                   This information is provided by RNS
         The company news service from the London Stock Exchange