SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 11-K

       ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE
                                  ACT OF 1934

         (Mark One)

         [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934 (No Fee Required)

         For the fiscal year ended December 31, 2005.

                                       Or

         [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934.

         For the transition period from _______________ to ____________________

         Commission file number:  1-13908

         A. Full title of the plan and the address of the plan, if different
from that of the issuer named below:

                           AMVESCAP 401(k) Plan
                           1360 Peachtree Street, N.E.
                           Atlanta, Georgia  30309

         B. Name of issuer of the securities held pursuant to the plan and the
address of its principal executive office:

                           AMVESCAP PLC
                           11 Devonshire Square
                           London EC2M 4YR


AUDITED FINANCIAL STATEMENTS AND
SUPPLEMENTAL SCHEDULE

AMVESCAP 401(k) Plan
As of December 31, 2005 and 2004 and for the Year Ended December 31, 2005







                              AMVESCAP 401(k) Plan

             Audited Financial Statements and Supplemental Schedule

                      As of December 31, 2005 and 2004 and for the
                          Year Ended December 31, 2005




                                    Contents

Report of Independent Registered Public Accounting Firm.......................1

Audited Financial Statements

Statements of Net Assets Available for Benefits...............................2
Statement of Changes in Net Assets Available for Benefits.....................3
Notes to Financial Statements.................................................4

Supplemental Schedule

Schedule H, Line 4i - Schedule of Assets (Held at End of Year)...............12










             Report of Independent Registered Public Accounting Firm

The Plan Administrator
AMVESCAP 401(k) Plan

We have audited the accompanying statements of net assets available for benefits
of the AMVESCAP 401(k) Plan as of December 31, 2005 and 2004, and the related
statement of changes in net assets available for benefits for the year ended
December 31, 2005. These financial statements are the responsibility of the
Plan's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. We were not engaged to perform an
audit of the Plan's internal control over financial reporting. Our audits
included consideration of internal control over financial reporting as a basis
for designing audit procedures that are appropriate in the circumstances, but
not for the purpose of expressing an opinion on the effectiveness of the Plan's
internal control over financial reporting. Accordingly, we express no such
opinion. An audit also includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the net assets available for benefits of the Plan at
December 31, 2005 and 2004, and the changes in its net assets available for
benefits for the year ended December 31, 2005, in conformity with U.S. generally
accepted accounting principles.

Our audits were performed for the purpose of forming an opinion on the financial
statements taken as a whole. The accompanying supplemental schedule of assets
(held at end of year) as of December 31, 2005 is presented for purposes of
additional analysis and is not a required part of the financial statements, but
is supplementary information required by the Department of Labor's Rules and
Regulations for Reporting and Disclosure under the Employee Retirement Income
Security Act of 1974. This supplemental schedule is the responsibility of the
Plan's management. The supplemental schedule has been subjected to the auditing
procedures applied in our audits of the financial statements and, in our
opinion, is fairly stated in all material respects in relation to the financial
statements taken as a whole.

                                                        /s/ Ernst & Young LLP
Atlanta, GA
June 14, 2006








                                                  AMVESCAP 401(k) Plan

                                     Statements of Net Assets Available for Benefits

                                                                                               

                                                                                             December 31
                                                                                      2005                   2004
                                                                             ------------------------ --------------------

Investments, at fair value:
   Cash equivalents                                                            1,266,238                    251,368
   AMVESCAP PLC ordinary shares                                                3,612,324                  3,210,548
   Non-employer common stock                                                     238,513                    296,886
   Mutual funds                                                              187,051,966                174,096,716
   Collective trusts                                                          92,338,918                 72,314,190
   Participant loans                                                           5,880,592                  6,249,551
                                                                             ------------------------ --------------------
Total investments                                                            290,388,551                256,419,259

Receivables:
   Employer contributions                                                        877,136                  1,155,662
   Investment income                                                                 473                        253
   Due from brokers for sales of securities                                            -                     14,896
                                                                             ------------------------ --------------------
Total receivables                                                                877,609                  1,170,811

Payables:
   Due to brokers for purchases of securities                                          -                      1,765
                                                                             ------------------------ --------------------
Total payables                                                                         -                      1,765
                                                                             ------------------------ --------------------
Net assets available for benefits                                            291,266,160                257,588,305
                                                                             ======================== ====================

See accompanying notes.





                                     AMVESCAP 401(k) Plan

                  Statement of Changes in Net Assets Available for Benefits

                                 For the Year Ended December 31, 2005


Additions:
   Contributions:
      Employers                                                              11,862,659
      Participants                                                           21,268,953
      Rollovers from qualified plans                                         12,794,914
                                                                             ----------
   Total contributions                                                       45,926,526

Net appreciation in fair value of investments                                15,046,293
Interest and dividends                                                        5,027,314
                                                                             ----------
Total additions                                                              66,000,133

Deductions:
   Benefits paid to participants                                            (32,307,216)
   Administrative expenses                                                      (15,062)
                                                                             -----------

Net increase                                                                 33,677,855

Net assets available for benefits:
   Beginning of year                                                        257,588,305
                                                                             ----------
   End of year                                                              291,266,160
                                                                            ===========

See accompanying notes.






                              AMVESCAP 401 (K) Plan

                          Notes to Financial Statements

                                December 31, 2005

1. Plan Description

The following description of the AMVESCAP 401(k) Plan (the Plan) is provided for
general information purposes only. More complete information regarding the
Plan's provisions may be found in the Plan document and summary plan
description.

General

The Plan,  established and effective January 1, 2000, and restated and amended
February 1, 2005, is a defined contribution plan for the benefit of qualifying
employees of AVZ, Inc.(the Plan Sponsor); A I M Management Group Inc. (AIM);
AMVESCAP Group Services, Inc.;  INVESCO Institutional  (N.A.), Inc.(INVESCO);
and Atlantic Trust Group, Inc. (Atlantic  Trust) (collectively, the Employers)
and their beneficiaries to provide for retirement, death, and disability
benefits. The ultimate parent company of the Employers is AMVESCAP PLC. The Plan
is subject to the provisions of the Employee Retirement Income Security Act
of 1974, as amended (ERISA).

Full-time or part-time salaried or hourly employees of the Employers are
generally eligible to participate in the Plan on the first day of their
employment, provided they are eligible employees, as defined. Nonresident
aliens, collective bargaining unit employees, leased employees, and independent
contractors are generally excluded from participating in the Plan.

Plan Administration

Effective February 1, 2005, the AMVESCAP Benefits Plan Committee was named the
administrator of the Plan (the Plan Administrator). AVZ, Inc. was the prior
administrator of the Plan. AMVESCAP National Trust Company (ANTC) is the Plan's
trustee and asset custodian, except for the ordinary shares of AMVESCAP PLC,
individual brokerage accounts, and grandfathered assets held in
participant-directed brokerage accounts, which are in the custody of State
Street Bank. ANTC is a wholly owned subsidiary of AMVESCAP Retirement, Inc
(ARI), a holding company whose ultimate parent company is AMVESCAP PLC.

AMVESCAP PLC sold the assets, liabilities and operations of ARI to Merrill Lynch
on July 15, 2005, but the holding company has yet to be liquidated. Prior to the
sale of ARI's assets, liabilities and operations, ARI provided record-keeping
services for the Plan. Effective July 15, 2005, ARI's assets, liabilities and
operations became part of the Princeton Retirement Group (PRG), a wholly owned
subsidiary of Merrill Lynch & Co. Effective this date, PRG began providing
record-keeping services for the Plan.






                              AMVESCAP 401(k) Plan

                    Notes to Financial Statements (continued)


1. Plan Description (continued)

Contributions

The Plan permits participants to make pretax elective deferrals of 1% to 75% of
compensation, as defined, subject to certain limitations under the Internal
Revenue Code (Code).Participants who attained the age of 50 during the year may
make catch-up contributions for prior years in accordance with IRS guidelines.
The Employers will not match these catch-up contributions.

The Employers are required to make matching contributions of 100% of the first
3% of compensation contributed by each participant, plus 50% of the next 2% of
compensation contributed by each participant. The Employers may also elect to
make a discretionary profit-sharing contribution to the Plan. Any discretionary
profit-sharing contributions are allocated based on relative compensation to all
eligible employees employed on the last day of the Plan year as well as those
who separate from service during the Plan year due to death, disability, or
retirement at age 59 1/2. No such discretionary contributions were made for the
year ended December 31, 2005.

The Plan also accepts rollovers of distributions from other tax-qualified plans.

Participant Accounts

The Plan is a defined contribution plan under which separate accounts are
maintained for each participant. Each participant's account is credited with
his/her elective deferrals, rollover contributions, employer matching
contributions, and allocations of employer profit-sharing contributions,
investment income and investment gains (losses). Investment gains (losses) are
valued and allocated to participants' accounts daily based on their relative
account balances in each investment option.

Vesting

Eligible participants are immediately vested in all contributions to the Plan.






1. Plan Description (continued)

Benefits

Benefits may be paid to a participant upon attainment of normal retirement age
(59 1/2), death, disability, or termination of employment. The normal form of
benefit is a lump-sum distribution. A participant may also elect to receive
installment payments. Distributions may be made by payment of a lump sum or may
be deferred by the participant if the accrued account balance exceeds $5,000.
Distribution amounts are determined based on the market value of the
participant's account as of the date the record-keeper processes the
distribution.

Any portion of a participant's account which is held in AMVESCAP PLC ordinary
shares may be distributed in-kind at the election of the participant, with a
minimum of 100 shares required to make this election.

Effective August 1, 2005, a participant is permitted an in-service withdrawal,
on a quarterly basis, from the vested portion of his/her account if he/she has
reached age 59 1/2. Prior to this change, participants were allowed annual
in-service withdrawals of amounts in a rollover account or after-tax account
(from prior plans) upon reaching normal retirement age.

Loans to Participants

The Plan permits loans to participants up to the lesser of 50% of the
participant's vested account balance or $50,000, less certain amounts for loans
outstanding during the prior year. For purposes of determining the maximum
amount a participant may borrow, the outstanding principal balance of loans
under any other plan of the Employers is also considered. A participant may have
only one outstanding loan at a time from the Plan or the AMVESCAP Money Purchase
Plan. A participant generally has up to five years to repay the principal and
interest, unless the loan is for the purchase of a residence, in which case the
repayment period is up to ten years. Loans are made for a minimum of $500, and
loan processing fees are charged directly to the participant's account. Interest
rates on loans to participants are determined at the time the loan is made based
on market rates, as determined by the Plan Administrator.  Principal and
interest is paid ratably through bi-monthly payroll deductions.

Effective July 15, 2005, participants whose employment terminated in connection
with the sale of ARI to Merrill Lynch may rollover their loans to eligible
retirement plans maintained by Merrill Lynch.






2. Investment Options

The Plan offers investment options that include mutual funds and
collective trusts managed by INVESCO, AIM, and Atlantic Trust. Effective August
1, 2005, the Plan Administrator added additional fund options to the Plan.
Participants can now elect model portfolios that provide a broader, balanced
option approach. A participant can chose from five portfolios made up of Plan
fund offerings based on various risk tolerance levels.

The Mutual Fund Window (MFW), which permits participants to establish an
individual brokerage account through State Street Brokerage, was changed on
August 1, 2005, to allow participants to invest 100% of their total account in
various mutual funds through this MFW. Prior to this change, participants were
allowed to invest up to 25% of their account through this individual brokerage
account.

Effective August 1, 2005, the Plan does not allow new contributions into the
AMVESCAP Stock Fund. Prior to this change, participants could invest no more
than 10% of their total account into this stock fund. Under London Stock
Exchange rules governing insider trading, "close periods" are designated at the
close of each calendar quarter during which purchases and sales in the stock
fund are restricted.

The separate investment options made available under the Plan may be changed,
eliminated, or modified from time to time by the Plan Administrator.
Participants make their investment elections in 1% increments with changes and
transfers allowed on a daily basis.

3. Summary of Significant Accounting Policies

Basis of Accounting

The Plan's financial statements are prepared on the accrual basis of accounting.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally
accepted accounting principles requires the Plan Administrator to use estimates
that affect the amounts reported in the financial statements and accompanying
notes. Actual results could differ from these estimates. However, in the opinion
of the Plan Administrator, such differences would not be significant.



3. Summary of Significant Accounting Policies (continued)

Risks and Uncertainties

The Plan provides for investment in securities, which, in general, are exposed
to various risks, such as interest rate, credit, and overall market volatility
risks. Due to the level of risk associated with certain investment securities,
it is reasonably possible that changes in the values of the investment
securities will occur in the near term, and such changes could materially affect
participants' account balances and the amounts reported in the statements of net
assets available for benefits.

Investment Valuation

Investments in securities traded on securities exchanges are valued at the
quoted market price on the last business day of the Plan year. Loans to
participants are carried at the amounts outstanding, which approximate their
estimated fair values.

Investments in units of collective trust funds are valued at the net unit value
of the respective collective trust funds as calculated each day by the trustee.
Investments in shares of investment companies (mutual funds) are valued at the
quoted market price in an active market on the last business day of the Plan
year.

Income Recognition

Dividend income is accrued on the ex-dividend date. Purchases and sales of
securities are recorded on a trade-date basis. Interest income is recorded on
the accrual basis.





3. Summary of Significant Accounting Policies (continued)

Net Appreciation (Depreciation) in Fair Value of Investments

Realized gains (losses) from the sales of investments and changes in unrealized
appreciation (depreciation) are aggregated and reported in the accompanying
statement of changes in net assets available for benefits as net appreciation in
fair value of investments.

Administrative Expenses

Certain administrative functions are performed by officers or employees of the
Employers. No such officer or employee receives compensation from the Plan. A
majority of administrative expenses are paid by the Employers. Effective January
1, 2005, INVESCO no longer charges investment management fees related to the
Plan's trust funds. Previously, such fees were paid by the Plan.

4. Investments

The fair market values of individual assets that represent 5% or more of the
Plan's net assets as of December 31 are as follows:


                                                                                       

     2005
     INVESCO Stable Value Trust Fund                                                    $  34,058,292
     INVESCO 500 Index Trust Fund                                                          30,166,357
     AIM Basic Value Fund - Institutional Share Class                                      25,324,706
     AIM Small Cap Growth Fund - Institutional Share Class                                 25,199,577
     AIM International Growth Fund - Institutional Share Class                             24,957,158
     AIM Dynamics Fund, Class A                                                            19,282,132
     AIM Large Cap Growth Fund - Institutional Share Class                                 18,504,150
     AIM Diversified Dividend Fund, Class A                                                15,054,998

     2004
     INVESCO Stable Value Trust Fund                                                    $  30,803,469
     AIM Basic Value Fund, Class A                                                         26,264,901
     AIM International Growth Fund, Class A                                                19,754,727
     AIM Dynamics Fund, Class A                                                            19,644,145
     AIM Small Cap Growth Fund, Class A                                                    18,835,630
     AIM Aggressive Growth Fund, Class A                                                   13,210,111



4. Investments (continued)

Net appreciation (depreciation) in the fair value of investments (including
investments purchased and sold, as well as held during the year) for the year
ended December 31, 2005, is as follows for each investment type, as determined
by the quoted market prices or trustee valuations:

                                                                                          

     AMVESCAP PLC ordinary shares                                                       $     836,934
     Non-employer common stock                                                                (6,203)
     Mutual funds                                                                          10,925,231
     Collective trusts                                                                      3,290,331
                                                                                          -----------
     Net appreciation in fair value of investments                                      $  15,046,293
                                                                                          ===========



5. Related-Party Transactions

A significant portion of the Plan's assets are invested in mutual and collective
trust funds managed by the Employers and their affiliates, INVESCO, AIM, and
Atlantic Trust. Such funds are charged management fees by the Employers and
their affiliates. As discussed in Note 3, INVESCO no longer charges
investment management fees related to the Plan's trust funds. Previously, such
fees were paid by the Plan.

At December 31, 2005 and 2004, the Plan held 518,538 and 588,260 ordinary shares
of AMVESCAP PLC common stock, respectively, which represents an ownership
interest in AMVESCAP PLC of less than 1%.

6. Tax Status

The Plan has received a determination letter from the Internal Revenue Service
dated January 9, 2003, stating that the Plan is qualified under Section 401(a)
of the Code and, therefore, the related trust is exempt from taxation.
Subsequent to this determination letter by the Internal Revenue Service,
the Plan was restated and amended. Once qualified, the Plan is required to
operate in conformity with the Code to maintain its qualification. The Plan
Administrator believes the Plan is being operated in compliance with the
applicable requirements of the Code and, therefore, believes that the Plan, as
restated and amended, is qualified and the related trust is tax exempt.




7. Plan Termination

The Plan Administrator intends to continue the Plan. However, the Plan
Administrator, through its board of directors or the board's designee, reserves
the right to amend, modify, or terminate the Plan at any time subject to the
provisions of ERISA. If the Plan is amended, participants will remain 100%
vested and the benefits already credited to participants under the Plan will
not be reduced unless required by the Internal Revenue Service. Because the
Plan is not a defined benefit pension plan under ERISA, the Plan's benefits are
not insured by the Pension Benefit Guaranty Corporation.

8. Differences Between Financial Statements and Form 5500

The following is a reconciliation of net assets available for benefits per the
financial statements to the Form 5500:

                                                                                         

                                                                                     December 31
                                                                              2005                  2004
                                                                     -------------------------------------------
     Net assets available for benefits per the financial statements       $ 291,266,160       $ 257,588,305
     Amounts allocated to withdrawn participants                              1,349,690                   -
                                                                     -------------------------------------------
     Net assets available for benefits per the Form 5500                  $ 289,916,470       $ 257,588,305
                                                                     ===========================================


The following is a reconciliation of benefits paid to participants per the
financial statements to the Form 5500:

                                                                                            

                                                                                            Year Ended December
                                                                                                  31, 2005
                                                                                           ---------------------
     Benefits paid to participants per the financial statements                              $  32,307,216
     Add amounts allocated to withdrawing participants as of end
        of year                                                                                  1,349,690
                                                                                           ---------------------
     Benefits paid to participants per the Form 5500                                         $  33,656,906
                                                                                           =====================



Amounts allocated to withdrawn participants are recorded on the Form 5500 for
benefit claims that have been processed and approved for payment prior to
year-end but not yet paid.







                              Supplemental Schedule








                               AMVESCAP 401 (k) Plan
                        EIN: 58-2287224 Plan Number: 010
                    Schedule H, Line 4i - Schedule of Assets
                                (Held at End of Year)
                                  December 31, 2005
                                                                                                      

  (a)            (b)                                      (c)                                              (e)
        Identity of Issue, Borrower,                    Description of                                   Current
          Lessor or Similar Party                        Investment                                       Value
------- ------------------------------------------- ------------------------------------------------- ---------------------

                                                        Cash                                                      154,324
        SSgA                                            Money Market Fund                                       1,111,914
  *     AMVESCAP PLC                                    Ordinary shares of common stock                         3,612,324
  *      INVESCO Institutional Retirement Trust         Stable Value Trust Fund                                34,058,292
  *      INVESCO Institutional Retirement Trust         International Equity Trust Fund                         5,793,696
  *      INVESCO Institutional Retirement Trust         500 Index Trust Fund                                   30,166,357
  *      INVESCO Institutional Retirement Trust         Equity Real Estate Securities Trust Fund                4,885,501
  *      INVESCO Institutional Retirement Trust         Structured Small Cap Value Equity Trust Fund            5,747,036
  *      INVESCO Institutional Retirement Trust         Core Fixed Income Trust Fund                           11,688,035
  *     AIM Advisors, Inc.                              Dynamics Fund, Class A                                 19,282,132
  *     AIM Advisors, Inc.                              Diversified Dividend Fund, Class A                     15,054,998
  *     AIM Advisors, Inc.                              Large Cap Growth Fund - Institutional Share Class      18,504,150
  *     AIM Advisors, Inc.                              Small Cap Growth Fund - Institutional Share Class      25,199,577
  *     AIM Advisors, Inc.                              Int'l. Growth Fund - Institutional Share Class         24,957,158
  *     AIM Advisors, Inc.                              Basic Value Fund - Institutional Share Class           25,324,706
  *     AIM Advisors, Inc.                              Weingarten Fund, Class A                                   73,865
  *     AIM Advisors, Inc.                              Global Equity Fund, Class A                                 1,298
  *     AIM Advisors, Inc.                              High Yield - Investor Class                               105,260
  *     AIM Advisors, Inc.                              Energy Fund, Class A                                       15,888
  *     AIM Advisors, Inc.                              Select Equity Fund, Class A                                 1,628
  *     AIM Advisors, Inc.                              Global Aggressive Growth Fund, Class A                     74,518
  *     Atlantic Whitehall Funds                        Mid Cap Growth Fund - Institutional Share Class        13,185,217
        SSgA                                            S&P Mid Cap Index SL Fund                              10,209,772
        SSgA                                            Russell 1000 Value Index SL Fund                        3,639,721
        SSgA                                            Russell 1000 Growth Index SL Fund                      14,455,465
        SSgA                                            Passive Bond Market Index SL Fund                         778,085
        SSgA                                            Treasury Inflation Protected Fund                         811,216
        SSgA                                            Russell 2000 Growth Index SL Fund                         293,003
        SSgA                                            Russell Daily EAFE Fund                                   299,996
        SSgA                                            Russell REIT Index                                      1,088,560
        PIMCO                                           Real Return Fund - Institutional Share Class              992,107
        Artisan                                         Mid Cap Value Fund - Investor Shares                    3,601,952
        AllianceBernstein                               International Value Fund - Advisor Shares               3,613,165
        Lasso                                           Long & Short Strategic Opportunities Fund               2,563,912
        Various non-Employer Stock and Mutual Funds     Various publicly traded self-directed investments       3,163,131
  *     Participant loans                               Promissory notes, with interest ranging
                                                           from 4.86% to 10.5% and varying maturities           5,880,592
                                                                                                         ----------------
                                                                                                              290,388,551
                                                                                                         ================



*Party in Interest
Note:  Column (d) cost information is not applicable





                                    SIGNATURE


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the trustees (or other persons who administer the employee benefit plan) have
duly caused this annual report to be signed on its behalf by the undersigned
hereunto duly authorized.


                              AMVESCAP 401(k) Plan

                                     By:      AMVESCAP Benefits Plan Committee
                                              Plan Administrator

Date:    June 27, 2006               By:      _/s/ Robert F McCullough____
                                              ----------------------------
                                              Name:    Robert F. McCullough
                                              Title:   Chairman





                                 EXHIBIT INDEX

Exhibit 23.1            Consent of Ernst & Young LLP