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 March, 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 Holding
Designation
BANK OF IRELAND 258227 888,556
BANK OF IRELAND 4239749 1,483,297
Bank of Ireland Nominees Limited CREST ID. 11X13 1,566,600
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 -69,908
BARCLAYS CAPITAL NOMINEES LIMITED -154,411
BARCLAYS CAPITAL NOMINEES LIMITED 346,210
BARCLAYS CAPITAL NOMINEES LIMITED 1,940,562
Barclays Noms Monument R97 C 000000000000000000 1,053
Barclays Trust Co & Others 8,077
BNP PARIBAS 63,549
BNY (OCS) NOMINEES LTD 221476 315,354
BOISS NOMINEES LTD 4224361 567,086
CHASE NOMINEES LTD 16376 527,631
CHASE NOMINEES LTD 16669 134,728
CHASE NOMINEES LTD 18243 123,823
CHASE NOMINEES LTD 19518 350,116
CHASE NOMINEES LTD 19519 2,633,656
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 908,176
CHASE NOMINEES LTD 28270 307,679
CHASE NOMINEES LTD 31961 1,306,245
CIBC MELLON GLOBAL SECURITIES 42,140
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) 220,787
Greig Middleton Nominees Limited (GM1) 11,750
HSBC 813168 855,040
HSBC 845315 27,190
INVESTORS BANK AND TRUST CO. 22,464
INVESTORS BANK AND TRUST CO. 874,807
INVESTORS BANK AND TRUST CO. 221,432
INVESTORS BANK AND TRUST CO. 2,130,422
INVESTORS BANK AND TRUST CO. 54,686
INVESTORS BANK AND TRUST CO. 70,520
JP MORGAN (BGI CUSTODY) 16331 268,775
JP MORGAN (BGI CUSTODY) 16341 560,581
JP MORGAN (BGI CUSTODY) 16341 2,160,554
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) 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 399,337
JPMorgan Chase Bank 555,319
MELLON BANK ABGFZ872482 579,322
MELLON BANK TGGF0003002 295,962
Mellon Trust - US CUSTODIAN / 102,247
MELLON TRUST OF NEW ENGLAND 101,660
MIDLAND BANK (HSBC BANK PLC) 772823 2,464,273
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 136,835
NORTHERN TRUST BANK - BGI SEPA 35,400
NORTHERN TRUST BANK - BGI SEPA 150,770
R C Greig Nominees Limited 940,952
R C Greig Nominees Limited 349,173
R C Greig Nominees Limited a/c AK1 737,063
R C Greig Nominees Limited a/c AK1 100,645
R C Greig Nominees Limited a/c BL1 98,672
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 64,089
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 594,987
STATE STREET N3YZ 10,871
STATE STREET TRUST OF CANADA - 96,482
The Northern Trust Company - U 68,739
ZEBAN NOMINEES LIMITED 1,000
ZEBAN NOMINEES LIMITED 1,700
Group Holding 105,727,030
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 9 MARCH 2006
11. Date company informed
13 MARCH 2006
12. Total holding following this notification
105,727,030
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)
10.91%
14. Any additional information
SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 114,823,988 (11.88%)
ON 28 FEBRUARY 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
14 MARCH 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 14 March, 2006 By ____/s/ Luke Thomas____
(Signature)*