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
                                          ---------
                        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): 
                                           ------

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):
                                           ------

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:  NOTIFICATION OF MAJOR INTERESTS IN SHARES
                                -----------------------------------------



AMVESCAP PLC
IMMEDIATE RELEASE   31 MAY 2005
CONTACT: ANGELA TULLY  TEL: 020 7065 3652

                                   SCHEDULE 10

                    NOTIFICATION OF MAJOR INTERESTS IN SHARES

1)   Name of company            AMVESCAP PLC

2)   Name of shareholder having a major interest

     AIC Limited, AIC Investment Services Inc., Mutual Funds Managed by AIC
     Limited and Accounts Managed by AIC Investment Services Inc.

3)   Please state whether notification indicates that it is in respect of
     holding of the shareholder named in 2 above or 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.

     NOTIFICATION IS IN RESPECT OF HOLDINGS OF AIC LIMITED and AIC INVESTMENTS
     SERVICES INC. AGGREGATED WITH HOLDINGS OF MUTUAL FUNDS MANAGED BY AIC
     LIMITED AND ACCOUNTS MANAGED BY AIC INVESTMENT SERVICES INC.

4)   Name of the registered holder(s) and, if more than one holder, the number
     of shares held by each of them

     NAME                         ORDINARY SHARES




5)   Number of shares/amount of stock Acquired                  -

6)   Percentage of issued class                                 -%

7)   Number of shares/amount of stock disposed                  NOT DISCLOSED

8)   Percentage of issued class                                 -%

9)   Class of security                                          ORDINARY SHARES

10)  Date of transaction                                        NOT DISCLOSED

11)  Date company informed                                      30 MAY 2005

12)  Total holding following this notification                  24,175,676

13)  Total percentage holding of issued class following 
     this notification                                          2.98%



14)  Any additional information                                 See Attachment A

15)  Name of contact and telephone number for queries 

        ANGELA TULLY
        TEL: 020 7065 3652

16)  Name and signature of authorised company official responsible for making
     this notification

        A. TULLY AMVESCAP PLC
        ASSISTANT COMPANY SECRETARY

        Date of Notification       31 MAY 2005






                                                                    ATTACHMENT A


AIC Limited ("AIC") is a corporation incorporated under the laws of Ontario.
AIC's wholly owned subsidiary AIC Investment Services Inc. ("AISI") is the
portfolio manager of certain accounts (including the Funds and other investment
advisor accounts) and AIC is the manager and trustee of certain mutual funds in
Ontario (collectively the "Funds") which are owners of record of the securities
of the AMVESCAP PLC ("AMVESCAP"). AISI is qualified to act as an investment
adviser to the Funds in Ontario, Canada pursuant to a registration under the
Securities Act Ontario. AISI is registered as an investment adviser under
Section 203 of the Investment Advisers Act of 1940. AIC as trustee of the Funds,
shares with the Funds the power to direct the voting and disposition of the
shares of the AMVESCAP held by the Funds. Michael Lee-Chin holds indirectly
through his sole ownership of Portland Holdings Inc. approximately 95% of the
voting equity securities of AIC and consequently he may be deemed under United
States securities law to beneficially own the shares of the AMVESCAP held by AIC
as trustee of the Funds and by the Funds, although he disclaims beneficial
ownership of such holding. Mr. Lee-Chin is a citizen and resident of Canada.



                                   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
                                        ------------------------------
                                                (Registrant)



Date  31 May, 2005                   By   /s/  Angela Tully
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                                                (Signature)

                                            Angela Tully
                                            Assistant Company Secretary