AMVESCAP PLC IMMEDIATE RELEASE 11 OCTOBER 2006 BLOCKLISTING SIX MONTHLY RETURN INFORMATION PROVIDED ON THIS FORM MUST BE TYPED OR PRINTED ELECTRONICALLY. TO: The FSA Date: 11 October 2006 ------------------------------------------------------------------------------- 1. Name of applicant: AMVESCAP PLC ------------------------------------------------------------------------------- 2. Name of scheme: AMVESCAP PLC TRIMARK ACQUISITION ------------------------------------------------------------------------------- 3. Period of return: From: 11 APRIL 2006 To: 10 OCTOBER 2006 ------------------------------------------------------------------------------- 4. Balance under scheme from previous return: 18,568,009 ------------------------------------------------------------------------------- 5. The amount by which the block scheme has been increased, if the scheme has been increased since the date of the last return: 0 ------------------------------------------------------------------------------- 6. Number of securities issued/allotted under scheme during period: 1,400,000 ------------------------------------------------------------------------------- 7. Balance under scheme not yet issued/allotted at end of period: 17,168,009 ------------------------------------------------------------------------------- 8. Number and class of securities originally listed and the date of admission: 65,988,401 ORDINARY SHARES OF 25P EACH LISTED ON 11 OCTOBER 2000. ------------------------------------------------------------------------------- 9. Total number of securities in issue at the end of the period: 827,948,917 ORDINARY SHARES OF US$0.10 ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Name of contact: MICHAEL S. PERMAN ------------------------------------------------------------------------------- Address of contact: 30 FINSBURY SQUARE, LONDON EC2 ------------------------------------------------------------------------------- Telephone number of contact: 020 7065 3942 ------------------------------------------------------------------------------- SIGNED BY Michael S. Perman Company Secretary, for and on behalf of AMVESCAP PLC Name of applicant If you knowingly or recklessly give false or misleading information you may be liable to prosecution.