SOURCE: Spirent PLC

February 20, 2006 11:10 ET

Spirent PLC announces Holding(s) in Company

Crawley, UK -- (MARKET WIRE) -- February 20, 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

BANK OF IRELAND                                    258227        943,383
BANK OF IRELAND                                   4239749      1,483,297
Bank of Ireland Nominees Limited          CREST ID. 11X13      1,299,000
BANK OF NEW YORK                                   210405      1,009,027
BANK OF NEW YORK                                   214075      5,492,767
BANK OF NEW YORK                                   221428        832,837
BANK OF NEW YORK                                   367748      2,907,094
BANK OF NEW YORK                                   392067      3,326,323
BANK OF NEW YORK                                   768198        257,328
BARCLAYS CAPITAL NOMINEES LIMITED                               -355,650
BARCLAYS CAPITAL NOMINEES LIMITED                                450,463
BARCLAYS CAPITAL NOMINEES LIMITED                              1,842,869
BARCLAYS CAPITAL NOMINEES LIMITED                               -116,031
Barclays Noms Monument R97    C 000000000000000000                 1,053
Barclays Trust Co & Others                                         8,077
BNP PARIBAS                                                      166,333
BNY (OCS) NOMINEES LTD                             221476        325,600
BOISS NOMINEES LTD                                4224361        567,086
CHASE NOMINEES LTD                                  16376        527,631
CHASE NOMINEES LTD                                  16530        187,794
CHASE NOMINEES LTD                                  16669        134,728
CHASE NOMINEES LTD                                  18243        123,823
CHASE NOMINEES LTD                                  19518        350,116
CHASE NOMINEES LTD                                  19519      2,722,202
CHASE NOMINEES LTD                                  20947     36,805,116
CHASE NOMINEES LTD                                  21359      1,483,196
CHASE NOMINEES LTD                                  25772        849,762
CHASE NOMINEES LTD                                  27793         56,306
CHASE NOMINEES LTD                                  27797        138,568
CHASE NOMINEES LTD                                  27800      1,037,801
CHASE NOMINEES LTD                                  28270        955,621
CHASE NOMINEES LTD                                  28270        307,679
CHASE NOMINEES LTD                                  31961      2,240,624
CIBC MELLON GLOBAL SECURITIES                                    107,805
CITIBANK                                       6010640794        241,026
CITIBANK                                       6010782807        462,289
DEUTSCHE BANK LONDON                              8003168         30,331
Gerrard Nominees Limited                           603856          1,208
Gerrard Nominees Limited                           642367         13,000
Gerrard Nominees Limited                           647291          8,500
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 Limited (GM1)                            11,750
Greig Middleton Nominees Limited (GM1)                           220,787
HSBC                                               813168        869,384
HSBC                                               845315         27,190
INVESTORS BANK AND TRUST CO.                                   2,082,285
INVESTORS BANK AND TRUST CO.                                     944,626
INVESTORS BANK AND TRUST CO.                                   5,535,120
INVESTORS BANK AND TRUST CO.                                     610,700
INVESTORS BANK AND TRUST CO.                                     221,432
INVESTORS BANK AND TRUST CO.                                      54,686
INVESTORS BANK AND TRUST CO.                                     154,750
INVESTORS BANK AND TRUST CO.                                      22,464
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      9,953,381
JP MORGAN (BGI CUSTODY)                             16612        342,149
JP MORGAN (BGI CUSTODY)                             16621        277,635
JP MORGAN (BGI CUSTODY)                             16644        559,641
JP MORGAN (BGI CUSTODY)                             16901        167,869
JP MORGAN (BGI CUSTODY)                             18409        791,821
JP MORGAN (BGI CUSTODY)                             19514        141,755
JP MORGAN (BGI CUSTODY)                             28166      2,892,184
JPMORGAN CHASE BANK                                              346,760
JPMorgan Chase Bank                                              399,337
JPMorgan Chase Bank                                              555,319
MELLON BANK                                   ABGFZ872482        640,798
MELLON BANK                                   TGGF0003002        295,962
Mellon Trust - US CUSTODIAN /                                    264,058
MELLON TRUST OF NEW ENGLAND                                      283,690
MIDLAND BANK (HSBC BANK PLC)                       772823      2,901,921
NON-IMA                                             DUMMY        708,218
NON-IMA                                             DUMMY      1,095,438
NON-IMA                                             DUMMY      6,980,817
NON-IMA                                             DUMMY        550,285
NON-IMA                                             DUMMY        116,798
NON-IMA                                             DUMMY        586,640
NON-IMA                                             DUMMY      2,358,360
NORTHERN TRUST                                      CVS21      1,242,437
NORTHERN TRUST                                      SCO06        303,975
NORTHERN TRUST                                      TNF01        532,061
NORTHERN TRUST                                      UKE01      1,049,771
NORTHERN TRUST                                      USF12      1,681,150
NORTHERN TRUST BANK - BGI SEPA                                   409,685
NORTHERN TRUST BANK - BGI SEPA                                   357,219
NORTHERN TRUST BANK - BGI SEPA                                    92,784
R C Greig Nominees Limited                                       961,234
R C Greig Nominees Limited                                       377,516
R C Greig Nominees Limited a/c AK1                               742,193
R C Greig Nominees Limited a/c AK1                               100,795
R C Greig Nominees Limited a/c BL1                                88,881
R C Greig Nominees Limited a/c BL1                                32,933
R C Greig Nominees Limited a/c CM1                                 6,650
R C Greig Nominees Limited a/c CM1                                24,646
R C Greig Nominees Limited GP1                                    64,589
R C Greig Nominees Limited GP1                                    51,481
R C Greig Nominees Limited SA1                                    31,232
R C Greig Nominees Limited SA1                                    65,680
R C Greig Nominees Limited SA1                    WIVE002          1,033
STATE STREET                                         2RJ2        103,736
STATE STREET                                         JD12        482,919
STATE STREET                                         JFBL        301,092
STATE STREET                                         N3B6         41,154
STATE STREET                                         N3YZ         10,871
STATE STREET TRUST OF CANADA -                                   126,407
The Northern Trust Company - U                                   177,135
ZEBAN NOMINEES LIMITED                                             1,000
ZEBAN NOMINEES LIMITED                                             1,700

                                    TOTAL                    127,589,189



5. Number of shares / amount of stock acquired


NOT KNOWN



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


NOT KNOWN



7. Number of shares / amount of stock disposed


-



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


-



9. Class of security


ORDINARY SHARES OF 3.3333 PENCE EACH



10. Date of transaction


HOLDING AS AT 14 FEBRUARY 2006



11. Date company informed


17 FEBRUARY 2006





12. Total holding following this notification


127,589,189



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)


13.21%



14. Any additional information


SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 115,783,982
(12.07%) ON 21 FEBRUARY 2005 AND 122,266,395 (12.67%) ON 
10 NOVEMBER 2005.



15. Name of contact and telephone number for queries


LUKE THOMAS - 01293 767658



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


LUKE THOMAS - DEPUTY COMPANY SECRETARY



Date of notification


20 FEBRUARY 2006






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