Filed Pursuant to Rule 424(b)(3)
                                                      Registration No. 333-63976
                                                      Registration No. 333-67988
               Trust Preferred Income Equity Redeemable Securities (PIERS) Units
                                                           CUSIP No. 939322 84 8
             Warrants to purchase shares of Washington Mutual, Inc. Common Stock
                                                           CUSIP No. 939322 11 1
       Trust Preferred Securities issued by Washington Mutual Capital Trust 2001
                                                           CUSIP No. 93933U 40 7


PROSPECTUS SUPPLEMENT DATED OCTOBER 5, 2001
(TO PROSPECTUS DATED SEPTEMBER 4, 2001)

                             WASHINGTON MUTUAL, INC.

               Trust Preferred Income Equity Redeemable Securities
                                  (PIERS) Units

This document  supplements the prospectus  dated September 4, 2001,  relating to
the units. Each unit consists of:

     o    a preferred  security  issued by Washington  Mutual Capital Trust 2001
          (the "Trust"), having a stated liquidation amount of $50, representing
          an  undivided  beneficial  interest in the assets of the Trust,  which
          assets consist solely of subordinated  debentures issued by Washington
          Mutual,  Inc. each of which has a principal amount at maturity of $50,
          a stated  maturity of July 1, 2041 and, at any time, an accreted value
          as described in the prospectus; and

     o    a warrant to  purchase  at any time prior to the close of  business on
          May 3, 2041, 1.2081 shares of common stock of Washington  Mutual.  The
          exercise  price of each  warrant on the initial  date of issuance  was
          $32.33  and  will  accrete  on a  daily  basis  as  described  in  the
          prospectus to $50 on the expiration date.

At any time after  issuance of the units,  the  preferred  security  and warrant
components  of  each  unit  may be  separated  by  the  holder  and  transferred
separately.  Thereafter,  a  separated  preferred  security  and  warrant may be
combined to form a unit.

The information in this  prospectus  supplements the information set forth under
the heading "Selling Securityholders" in the prospectus dated September 4, 2001.
Deephaven  Domestic  Convertible  Trading  LTD,  First  Union  Risk  Management,
Independence  Blue  Cross,  Merrill  Lynch  Insurance  Group and Ohio  Bureau of
Workers were listed in the September 4, 2001  prospectus  and have  subsequently
purchased additional units. As a result of these purchases,  the number of units
eligible for resale pursuant to the Registration Statement by persons previously
named as Selling  Securityholders  and named below is adjusted to the number set



forth opposite such person's name (without  adjustment for any resales that such
person has made pursuant to the Registration Statement). The other persons named
below are added to the list of Selling Securityholders,  and the number of units
that  each may sell  pursuant  to the  Registration  Statement  is as set  forth
opposite such person's name.



                                            Securities Beneficially Owned Prior to the       Securities That
                                                           the Offering                        May be Sold
      Selling Securityholder                        Number                 Type                 Hereunder
--------------------------------------             -------                 ------            ---------------
                                                                                       
Cincinnati Insurance Company..........              75,000                 Units                 75,000
CSFB Convertible and Quantative
  Strategies..........................             200,000                 Units                200,000
Deephaven Domestic Convertible
  Trading LTD.........................             334,000                 Units                334,000
First Union Risk Management...........             325,000                 Units                325,000
Independence Blue Cross...............               7,870                 Units                  7,870
LLT Limited...........................                 400                 Units                    400
Merrill Lynch Insurance Group.........               9,510                 Units                  9,510
Motion Picture Industry...............              12,702                 Units                 12,702
Northern Income Equity Fund...........              40,000                 Units                 40,000
Ohio Bureau of Workers Compensation...               4,650                 Units                  4,650
Sage Capital..........................               2,000                 Units                  2,000

------------------


"Preferred  Income Equity  Redeemable  Securities" and "PIERS" are service marks
owned by Lehman Brothers Inc.

     NEITHER THE  SECURITIES AND EXCHANGE  COMMISSION  NOR ANY STATE  SECURITIES
COMMISSION  HAS APPROVED OR DISAPPROVED  THESE  SECURITIES OR DETERMINED IF THIS
PROSPECTUS  IS TRUTHFUL OR  COMPLETE.  ANY  REPRESENTATION  TO THE CONTRARY IS A
CRIMINAL OFFENSE.

     THESE SECURITIES OFFERED HEREBY ARE NOT SAVINGS ACCOUNTS, DEPOSITS OR OTHER
OBLIGATIONS  OF ANY  BANK OR  SAVINGS  ASSOCIATION  AND ARE NOT  INSURED  BY THE
FEDERAL  DEPOSIT  INSURANCE  CORPORATION,  THE BANK INSURANCE  FUND, THE SAVINGS
ASSOCIATION INSURANCE FUND OR ANY OTHER GOVERNMENTAL AGENCY.














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