UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934
For the month of February, 2006
SPIRENT plc
_____________________________________________________________________
(Translation of registrant's name into English)
Spirent House, Crawley Business Quarter, Fleming Way, Crawley, West Sussex
RH10 9QL, UK.
_____________________________________________________________________
(Address of principal executive offices)
Indicate by check mark whether the registrant files or will file annual reports
under cover Form 20-F or Form 40-F.
Form 20-F X Form 40-F.....
Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.
Yes ..... No X
If "Yes" is marked, indicate below the file number assigned to the registrant
in connection with Rule 12g3-2(b): 82- ________
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
Signatures
Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.
______LUKE THOMAS______
(Registrant)
Date 20 February 2006 By ____/s/ Luke Thomas____
(Signature)*