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 July, 2006
SPIRENT COMMUNICATIONS 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- ________
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: SPIRENT EXECUTIVE SHARE OPTION SCHEME, 1995
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 2,386,034 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been 3,500,000 ORDINARY SHARES OF 3 1/3p EACH
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme 1,753,775 ORDINARY SHARES OF 3 1/3p EACH
during period:
Balance under scheme not yet issued/allotted at end 4,132,259 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 3,000,000 ORDINARY SHARES OF 3 1/3p EACH DATED 29
the date of admission: SEPTEMBER 2000
3,000,000 ORDINARY SHARES OF 3 1/3 p EACH DATED 28
MAY 2004
3,500,000 ORDINARY SHARES OF 3 1/3p EACH DATED 14
MARCH 2006
Total number of securities in issue at the end of the 970,810,133 ORDINARY
SHARES OF 3 1/3 p EACH period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: U.S EMPLOYEE STOCK PURCHASE PLAN
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 1,237,364 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been NIL
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme NIL
during period:
Balance under scheme not yet issued/allotted at end 1,237,364 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 435,000 ORDINARY SHARES OF 3 1/3p EACH DATED 5 JUNE
the date of admission: 2001
3,500,000 ORDINARY SHARES OF 3 1/3 p EACH DATED 1
NOVEMBER 2001
7,000,000 ORDINARY SHARES OF 3 1/3 p EACH DATED 18
NOVEMBER 2002
1,800,000 ORDINARY SHARES OF 3 1/3 p EACH DATED 6
DECEMBER 2004
Total number of securities in issue at the end of the 970,810,133 ORDINARY
SHARES OF 3 1/3 p EACH period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: SPIRENT GLOBAL ALL EMPLOYEE SHARE PURCHASE PLAN
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 814,444 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been NIL
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme NIL
during period:
Balance under scheme not yet issued/allotted at end 814,444 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 1,000,000 ORDINARY SHARES OF 3 1/3p EACH DATED 18
the date of admission: NOVEMBER 2002
700,000 ORDINARY SHARES OF 3 1/3 p EACH DATED 6
DECEMBER 2004
Total number of securities in issue at the end of the 970,810,133 ORDINARY
SHARES OF 3 1/3 p EACH period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: NETCOM AMENDED AND RESTATED STOCK OPTION PLAN
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 4,200,894 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been NIL
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme 2,674,007 ORDINARY SHARES OF 3 1/3p EACH
during period:
Balance under scheme not yet issued/allotted at end 1,526,887 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 3,291,399 ORDINARY SHARES OF 3 1/3p EACH DATED 3
the date of admission: SEPTEMBER 1999
1,739,130 ORDINARY SHARES OF 3 1/3 p EACH DATED 8
JULY 2002
6,722,689 ORDINARY SHARES OF 3 1/3 p EACH DATED 8
OCTOBER 2002
Total number of securities in issue at the end of the 970,810,133 ORDINARY SHARES OF 3 1/3 p EACH
period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: ZARAK AMENDED AND RESTATED STOCK OPTION PLAN
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 2,690,996 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been NIL
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme NIL
during period:
Balance under scheme not yet issued/allotted at end 2,690,996 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 3,895,474 ORDINARY SHARES OF 3 1/3p EACH DATED 14
the date of admission: NOVEMBER 2000
Total number of securities in issue at the end of the 970,810,133 ORDINARY SHARES OF 3 1/3 p EACH
period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: SPIRENT SAVINGS RELATED SHARE OPTION SCHEME
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 68,185 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been NIL
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme NIL
during period:
Balance under scheme not yet issued/allotted at end 68,185 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 200,000 ORDINARY SHARES OF 3 1/3p EACH DATED 31
the date of admission: DECEMBER 2003
Total number of securities in issue at the end of the 970,810,133 ORDINARY SHARES OF 3 1/3 p EACH
period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: SPIRENT STOCK INCENTIVE PLAN
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 4,453,686 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been NIL
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme 589,855 ORDINARY SHARES OF 3 1/3p EACH
during period:
Balance under scheme not yet issued/allotted at end 3,863,831 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 3,720,930 ORDINARY SHARES OF 3 1/3p EACH DATED 1
the date of admission: OCTOBER 2003
3,703,703 ORDINARY SHARES OF 3 1/3 p EACH DATED 2
OCTOBER 2003
Total number of securities in issue at the end of the 970,810,133 ORDINARY SHARES OF 3 1/3 p EACH
period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
BLOCKLISTING SIX MONTHLY RETURN
To: The FSA
Date: 28 July 2006
Name of applicant: SPIRENT COMMUNICATIONS PLC
Name of scheme: CAW AMENDED AND RESTATED STOCK OPTION PLAN
Period of return: From: 1 JANUARY 2006 To: 30 JUNE 2006
Balance under scheme from previous return: 836,399 ORDINARY SHARES OF 3 1/3p EACH
The amount by which the block scheme has been NIL
increased, if the scheme has been increased since the
date of the last return:
Number of securities issued/allotted under scheme 2,914 ORDINARY SHARES OF 3 1/3p EACH
during period:
Balance under scheme not yet issued/allotted at end 833,485 ORDINARY SHARES OF 3 1/3p EACH
of period:
Number and class of securities originally listed and 1,300,000 ORDINARY SHARES OF 3 1/3p EACH DATED 15
the date of admission: AUGUST 2002
115,394 ORDINARY SHARES OF 3 1/3 p EACH DATED 28
AUGUST 2002
Total number of securities in issue at the end of the 970,810,133 ORDINARY SHARES OF 3 1/3 p EACH
period :
Name of contact: Warren Nash
Address of contact: Spirent Communications plc
Spirent House
Crawley Business Quarter
Fleming Way
Crawley, RH10 9QL
Telephone number of contact: 01293 767676
SIGNED BY Warren Nash
Director/company secretary/suitably experienced employee/duly authorised officer, for and on
behalf of
Spirent Communications plc
Name of applicant
If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.
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 28 July, 2006 By ____/s/ Luke Thomas____
(Signature)*