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 May, 2005
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                        Commission File Number 001-13908
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                                  AMVESCAP PLC
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                 (Translation of registrant's name into English)

                 30 Finsbury Square, London EC2A 1AG, ENGLAND
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                    (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 if the registrant is submitting the Form 6-K in paper as
permitted by Regulation S-T Rule 101(b)(1): 
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Indicate by check mark if the registrant is submitting the Form 6-K in paper as
permitted by Regulation S-T Rule 101(b)(7):
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Indicate by check mark whether by furnishing the information contained in this
Form, the registrant 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-     N/A
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Description of document filed:  AMVESCAP Global Stock Plan purchased 553,612
                                --------------------------------------------
                                Ordinary Shares.
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AMVESCAP PLC
IMMEDIATE RELEASE 5 MAY 2005
CONTACT: MICHAEL PERMAN TEL: 020 7065 3942



In accordance with Chapter 16.13 of the Listing Rules, notification is hereby
given that on the 4 May 2005 the Trustee of the AMVESCAP Global Stock Plan ("the
Plan") purchased 553,612 ordinary shares of AMVESCAP PLC at (pound)3.0578. The
Company was notified of this purchase on 5 May 2005.

Shares held by the Trust are used in connection with the AMVESCAP Global Stock
Plan, which is established to provide deferred share incentive arrangements to
selected employees of the AMVESCAP group of companies world-wide. The Directors
of the Company are deemed to be considered interested in all of the Shares held
by the Trustees.




5 MAY 2005



                                   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.



                                                AMVESCAP PLC
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                                                (Registrant)



Date  5 May, 2005                   By   /s/  Michael S. Perman
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                                                (Signature)

                                            Michael S. Perman
                                            Company Secretary