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Stock Option Agreement - H.F. Ahmanson & Co. and Washington Mutual Inc.

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         THE TRANSFER OF THIS AGREEMENT IS SUBJECT TO CERTAIN PROVISIONS
        CONTAINED HEREIN AND TO RESALE RESTRICTIONS UNDER THE SECURITIES
                             ACT OF 1933, AS AMENDED

        STOCK OPTION AGREEMENT, dated March 16, 1998, between H.F. Ahmanson &
Company, a Delaware corporation ("Issuer"), and Washington Mutual, Inc., a
Washington corporation ("Grantee").

                              W I T N E S S E T H:

        WHEREAS, Grantee and Issuer have entered into an Agreement and Plan of
Merger of even date herewith (the "Merger Agreement"), which agreement has been
executed by the parties hereto immediately prior to this Stock Option Agreement
(this "Agreement"); and

        WHEREAS, as a condition to Grantee's entering into the Merger Agreement
and in consideration therefor, Issuer has agreed to grant Grantee the Option (as
hereinafter defined);

        NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements set forth herein and in the Merger Agreement, the
parties hereto agree as follows:

        1. Grant of Option.

        (a) Issuer hereby grants to Grantee an unconditional, irrevocable option
(the "Option") to purchase, subject to the terms hereof, up to an aggregate of
21,796,426 fully paid and nonassessable shares of Issuer's Common Stock, par
value $.01 per share ("Common Stock"), at a price of $79.86 per share (the
"Option Price"); provided, however, that in no event shall the number of shares
of Common Stock for which this Option is exercisable exceed 19.9% of the
Issuer's issued and outstanding shares of Common Stock without giving effect to
any shares subject to or issued pursuant to the Option. The number of shares of
Common Stock that may be received upon the exercise of the Option and the Option
Price are subject to adjustment as herein set forth.

        (b) In the event that any shares of Common Stock are either (i) issued
or otherwise become outstanding after the date of this Agreement (other than
pursuant to this Agreement and other than pursuant to an event described in
Section 5 hereof) or (ii) redeemed, repurchased, retired or otherwise cease to
be outstanding after the date of this Agreement, the number of shares of Common
Stock subject to the Option shall be increased or decreased, as appropriate, so
that, after such issuance or such redemption, repurchase, retirement or other
action, such number equals 19.9% of the number of shares of Common Stock then
issued and outstanding without giving effect to any shares subject or issued
pursuant to the Option. Nothing contained in this Section 1(b) or elsewhere in
this Agreement shall be deemed to authorize Issuer or Grantee to issue, redeem,
repurchase or retire shares in breach of any provision of the Merger Agreement.


<PAGE>   2

2.      Exercise of Option.

        (a) The Holder (as hereinafter defined) may exercise the Option, in
whole or part, and from time to time, if both an Initial Triggering Event (as
hereinafter defined) and a Subsequent Triggering Event (as hereinafter defined)
shall have occurred prior to the occurrence of an Exercise Termination Event (as
hereinafter defined), provided that the Holder shall have sent the written
notice of such exercise (as provided in subsection (e) of this Section 2) within
ninety days following such Subsequent Triggering Event (or such longer period as
provided in Section 10), provided further, however, that if the Option cannot be
exercised on any day because of any injunction, order or similar restraint
issued by a court of competent jurisdiction, the period during which the Option
may be exercised shall be extended so that the Option shall expire no earlier
than on the tenth business day after such injunction, order or restraint shall
have been dissolved or when such injunction, order or restraint shall have
become permanent and no longer subject to appeal, as the case may be. Each of
the following shall be an "Exercise Termination Event": (i) the Effective Time
(as defined in the Merger Agreement); (ii) termination of the Merger Agreement
in accordance with the provisions thereof if such termination occurs prior to
the occurrence of an Initial Triggering Event; (iii) the passage of 18 months
after termination of the Merger Agreement if such termination follows the
occurrence of an Initial Triggering Event; or (iv) delivery of a written request
for payment of Termination Fees pursuant to Section 8.02 of the Merger Agreement
(provided that no such Exercise Termination Event shall be deemed to have
occurred unless such Termination Fees are paid in accordance with such Section
8.02). The term "Holder" shall mean the holder or holders of the Option.
Notwithstanding anything to the contrary herein, (i) the Option may not be
exercised at any time when Grantee shall be in breach of any of its
representations, warranties, covenants or agreements contained in the Merger
Agreement such that Issuer would be entitled to terminate the Merger Agreement
pursuant to Section 8.01(b) thereof and (ii) this Agreement shall automatically
terminate upon the termination of the Merger Agreement pursuant to Section
8.01(b) thereof as a result of the breach by Grantee of its representations,
warranties, covenants or agreements contained in the Merger Agreement.

        (b) The term "Initial Triggering Event" shall mean any of the following
events or transactions occurring after the date hereof:

        (i) Issuer or any of its Significant Subsidiaries, as defined in Rule
        1-02 of Regulation S-X promulgated by the Securities and Exchange
        Commission (each an "Issuer Subsidiary"), without having received
        Grantee's prior written consent, shall have entered into an agreement to
        engage in an Acquisition Transaction (as hereinafter defined) with any
        person (the term "person" for purposes of this Agreement having the
        meaning assigned thereto in Sections 3(a)(9) and 13(d)(3) of the
        Securities Exchange Act of 1934, as amended (the "1934 Act"), and the
        rules and regulations thereunder) other than Grantee or any of its
        Subsidiaries (each a "Grantee Subsidiary") or the Board of Directors of
        Issuer shall have recommended that the stockholders of Issuer approve or
        accept any Acquisition Transaction with any person other than Grantee or
        a Subsidiary of Grantee. For purposes of this Agreement, "Acquisition
        Transaction" shall mean (x) a


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<PAGE>   3
        merger or consolidation, or any similar transaction, involving Issuer or
        any Issuer Subsidiary, (y) a purchase, lease or other acquisition or
        assumption of all or a substantial portion of the assets or deposits of
        Issuer or any Issuer Subsidiary, or (z) a purchase or other acquisition
        (including by way of merger, consolidation, share exchange or otherwise)
        of securities representing 10% or more of the voting power of Issuer;
        provided, however, that in no event shall any merger, consolidation,
        purchase or similar transaction involving only the Issuer and one or
        more of Issuer Subsidiaries or involving only two or more of Issuer
        Subsidiaries, be deemed to be an Acquisition Transaction, provided that
        any such transaction is not entered into in violation of the terms of
        the Merger Agreement;

                (ii) (A) Issuer or any Issuer Subsidiary, without having
        received Grantee's prior written consent, shall have authorized,
        recommended, proposed or publicly announced its intention to authorize,
        recommend or propose, to engage in an Acquisition Transaction with any
        person other than Grantee or a Grantee Subsidiary, or (B) the Board of
        Directors of Issuer shall have failed to make its recommendation that
        the stockholders of Issuer approve the transactions contemplated by the
        Merger Agreement, or (C) the Board of Directors of Issuer shall have
        publicly withdrawn or modified, or publicly announced its interest to
        withdraw or modify, in any manner adverse to Grantee, its recommendation
        that the stockholders of Issuer approve the transactions contemplated by
        the Merger Agreement.

                (iii) Any person, other than Grantee, any Grantee Subsidiary or
        any Issuer Subsidiary acting in a fiduciary capacity in the ordinary
        course of its business, shall have acquired beneficial ownership or the
        right to acquire beneficial ownership of 10% or more of the outstanding
        shares of Common Stock (the term "beneficial ownership" for purposes of
        this Agreement having the meaning assigned thereto in Section 13(d) of
        the 1934 Act, and the rules and regulations thereunder);

                (iv) After any person other than Grantee or any Grantee
        Subsidiary shall have made a bona fide proposal to Issuer or its
        stockholders by public announcement or written communication that is or
        becomes the subject of public disclosure to engage in an Acquisition
        Transaction, the stockholder approval required by Section 7.01(a) of the
        Merger Agreement is not obtained at the Ahmanson Meeting;

                (v) After an overture is made by a third party to Issuer or its
        stockholders to engage in an Acquisition Transaction (whether such
        overture becomes the subject of public disclosure or not), Issuer shall
        have willfully breached any covenant or obligation contained in the
        Merger Agreement or willfully breached any representation or warranty
        contained in the Merger Agreement and such breach (x) would entitle
        Grantee to terminate the Merger Agreement and (y) shall not have been
        cured prior to the Notice Date (as defined below);

                (vi) Any person other than Grantee or any Grantee Subsidiary,
        other than in connection with a transaction to which Grantee has given
        its prior written consent,


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<PAGE>   4



        shall have filed an application or notice with the Office of Thrift
        Supervision ("OTS"), the Federal Reserve Board, or other federal or
        state bank regulatory authority, which application or notice has been
        accepted for processing, for approval to engage in an Acquisition
        Transaction; or

                (vii) Any person other than Grantee or any Grantee Subsidiary
        commences or publicly announces its intention to commence a tender offer
        or exchange offer for securities representing 10% or more of the voting
        power of Issuer.

        (c) The term "Subsequent Triggering Event" shall mean either of the
following events or transactions occurring after the date hereof:

                (i) The acquisition by any person of beneficial ownership of 25%
        or more of the then outstanding shares of Common Stock; or

                (ii) The occurrence of the Initial Triggering Event described in
        Section 2(b)(i) hereof, except that the percentage referred to in clause
        (z) thereof shall be 25%.

        (d) Issuer shall notify Grantee promptly in writing of the occurrence of
any Initial Triggering Event or Subsequent Triggering Event of which it has
notice, it being understood that the giving of such notice by Issuer shall not
be a condition to the right of the Holder to exercise the Option.

        (e) In the event the Holder is entitled to and wishes to exercise the
Option, it shall send to Issuer a written notice (the date of which being herein
referred to as the "Notice Date") specifying (i) the total number of shares it
will purchase pursuant to such exercise and (ii) a place and date not earlier
than three business days nor later than 60 business days from the Notice Date
for the closing of such purchase (the "Closing Date"); provided that if prior
notification to or approval of the Federal Reserve Board or the OTS or any other
regulatory or antitrust agency is required in connection with such purchase, the
Holder shall promptly file the required notice or application for approval,
shall promptly notify Issuer of such filing and shall expeditiously process the
same and the period of time that otherwise would run pursuant to this sentence
shall run instead from the date on which any required notification periods have
expired or been terminated or such approvals have been obtained and any
requisite waiting period or periods shall have passed. Any exercise of the
Option shall be deemed to occur on the Notice Date relating thereto.

        (f) At the closing referred to in subsection (e) of this Section 2, the
Holder shall pay to Issuer the aggregate purchase price for the shares of Common
Stock purchased pursuant to the exercise of the Option in immediately available
funds by wire transfer to a bank account designated by Issuer, provided that
failure or refusal of Issuer to designate such a bank account shall not preclude
the Holder from exercising the Option.

        (g) At such closing, simultaneously with the delivery of immediately
available funds as provided in subsection (f) of this Section 2, Issuer shall
deliver to the Holder a certificate or certificates representing the number of
shares of Common Stock purchased by the


                                       -4-
<PAGE>   5
Holder and, if the Option should be exercised in part only, a new Agreement for
an Option evidencing the rights of the Holder thereof to purchase the balance of
the shares purchasable hereunder, and the Holder shall deliver to Issuer this
Agreement and a letter agreeing that the Holder will not offer to sell or
otherwise dispose of such shares in violation of applicable law or the
provisions of this Agreement.

        (h) Certificates for Common Stock delivered at a closing hereunder may
be endorsed with a restrictive legend that shall read substantially as follows:

        "The transfer of the shares represented by this certificate is subject
        to certain provisions of an agreement between the registered holder
        hereof and H. F. Ahmanson & Company and to resale restrictions arising
        under the Securities Act of 1933, as amended. A copy of such agreement
        is on file at the principal office of H. F. Ahmanson & Company and will
        be provided to the holder hereof without charge upon receipt by H. F.
        Ahmanson & Company of a written request therefor."

It is understood and agreed that: (i) the reference to the resale restrictions
of the Securities Act of 1933, as amended (the "1933 Act"), in the above legend
shall be removed by delivery of substitute certificate(s) without such reference
if the Holder shall have delivered to Issuer a copy of a letter from the staff
of the Securities and Exchange Commission (the "SEC"), or an opinion of counsel,
in form and substance reasonably satisfactory to Issuer, to the effect that such
legend is not required for purposes of the 1933 Act; (ii) the reference to the
provisions of this Agreement in the above legend shall be removed by delivery of
substitute certificate(s) without such reference if the shares have been sold or
transferred in compliance with the provisions of this Agreement and under
circumstances that do not require the retention of such reference in the opinion
of counsel, in form and substance reasonably satisfactory to Issuer; and (iii)
the legend shall be removed in its entirety if the conditions in the preceding
clauses (i) and (ii) are both satisfied. In addition, such certificates shall
bear any other legend as may be required by law.

                (i) Upon the giving by the Holder to Issuer of the written
        notice of exercise of the Option provided for under subsection (e) of
        this Section 2 and the tender of the applicable purchase price in
        immediately available funds, the Holder shall be deemed to be the holder
        of record of the shares of Common Stock issuable upon such exercise,
        notwithstanding that the stock transfer books of Issuer shall then be
        closed or that certificates representing such shares of Common Stock
        shall not then be actually delivered to the Holder. Issuer shall pay all
        expenses, and any and all United States federal, state and local taxes
        and other charges that may be payable in connection with the
        preparation, issue and delivery of stock certificates under this Section
        2 in the name of the Holder or its assignee, transferee or designee.

        3. Certain Issuer Actions. Issuer agrees: (i) that it shall at all times
maintain, free from preemptive rights, sufficient authorized but unissued or
treasury shares of Common Stock so that the Option may be exercised without
additional authorization of Common Stock after giving effect to all other
options, warrants, convertible securities and other rights to purchase


                                       -5-
<PAGE>   6
Common Stock; (ii) that it will not, by charter amendment or through
reorganization, consolidation, merger, dissolution or sale of assets, or by any
other voluntary act, avoid or seek to avoid the observance or performance of any
of the covenants, stipulations or conditions to be observed or performed
hereunder by Issuer; (iii) promptly to take all action as may from time to time
be required (including (x) complying with all premerger notification, reporting
and waiting period requirements specified in 15 U.S.C. Section18a and
regulations promulgated thereunder and (y) in the event, under any federal or
state banking law, prior approval of or notice to the Federal Reserve Board, the
OTS or to any state regulatory authority is necessary before the Option may be
exercised, cooperating fully with the Holder in preparing such applications or
notices and providing such information to the Federal Reserve Board, the OTS or
such state regulatory authority as they may require) in order to permit the
Holder to exercise the Option and Issuer duly and effectively to issue shares of
Common Stock pursuant hereto; and (iv) promptly to take all action provided
herein to protect the rights of the Holder against dilution.

        4. Exchange. This Agreement (and the Option granted hereby) are
exchangeable, without expense, at the option of the Holder, upon presentation
and surrender of this Agreement at the principal office of Issuer, for other
Agreements providing for Options of different denominations entitling the holder
thereof to purchase, on the same terms and subject to the same conditions as are
set forth herein, in the aggregate the same number of shares of Common Stock
purchasable hereunder. The terms "Agreement" and "Option" as used herein include
any Stock Option Agreements and related Options for which this Agreement (and
the Option granted hereby) may be exchanged. Upon receipt by Issuer of evidence
reasonably satisfactory to it of the loss, theft, destruction or mutilation of
this Agreement, and (in the case of loss, theft or destruction) of reasonably
satisfactory indemnification, and upon surrender and cancellation of this
Agreement, if mutilated, Issuer will execute and deliver anew Agreement of like
tenor and date. Any such new Agreement executed and delivered shall constitute
an additional contractual obligation on the part of Issuer, whether or not the
Agreement so lost, stolen, destroyed or mutilated shall at any time be
enforceable by anyone.

        5. Adjustment of Shares. In addition to the adjustment in the number of
shares of Common Stock that are purchasable upon exercise of the Option pursuant
to Section 1 of this Agreement, the number of shares of Common Stock purchasable
upon the exercise of the Option and the Option Price shall be subject to
adjustment from time to time as provided in this Section 5. In the event of any
change in, or distributions in respect of, the Common Stock by reason of stock
dividends, split-ups, mergers, recapitalizations, combinations, subdivisions,
conversions, exchanges of shares, distributions on or in respect of the Common
Stock that would be prohibited under the terms of the Merger Agreement, or the
like, the type and number of shares of Common Stock purchasable upon exercise
hereof and the Option Price shall be appropriately adjusted in such manner as
shall fully preserve the economic benefits provided hereunder and proper
provision shall be made in any agreement governing any such transaction to
provide for such proper adjustment and the full satisfaction of the Issuer's
obligations hereunder.

        6. Registration Rights. Upon the occurrence of a Subsequent Triggering
Event that occurs prior to an Exercise Termination Event, Issuer shall, at the
request of Grantee (whether on


                                       -6-
<PAGE>   7
its own behalf or on behalf of any subsequent holder of this Option (or part
thereof) or any of the shares of Common Stock issued pursuant hereto) delivered
within six months of such Subsequent Triggering Event (or such longer period as
provided in Section 10), promptly prepare, file and keep current a shelf
registration statement under the 1933 Act covering this Option and any shares
issued and issuable pursuant to this Option and shall use its reasonable best
efforts to cause such registration statement to become effective and remain
current in order to permit the sale or other disposition of this Option and any
shares of Common Stock issued upon total or partial exercise of this Option
("Option Shares") in accordance with any plan of disposition requested by
Grantee. Issuer will use its reasonable best efforts to cause such registration
statement first to become effective and thereafter to remain effective for such
period not in excess of 180 days from the day such registration statement first
becomes effective or such shorter time as may be reasonably necessary to effect
such sales or other dispositions. Grantee shall have the right to demand two
such registrations. The foregoing notwithstanding, if, at the time of any
request by Grantee for registration of the Option or Option Shares as provided
above, Issuer is in registration with respect to an underwritten public offering
of shares of Common Stock, and if in the good faith judgment of the managing
underwriter or managing underwriters, or, if none, the sole underwriter or
underwriters, of such offering the inclusion of the Option or Option Shares
would interfere with the successful marketing of the shares of Common Stock
offered by Issuer, the number of Option Shares otherwise to be covered in the
registration statement contemplated hereby may be reduced; provided, however,
that after any such required reduction the number of Option Shares to be
included in such offering for the account of the Holder shall constitute at
least 25% of the total number of shares to be sold by the Holder and Issuer in
the aggregate; and provided further, however, that if such reduction occurs,
then Issuer shall file a registration statement for the balance as promptly as
practicable and no reduction shall thereafter occur. Each such Holder shall
provide all information reasonably requested by Issuer for inclusion in any
registration statement to be filed hereunder. If requested by any such Holder in
connection with such registration, Issuer shall become a party to any
underwriting agreement relating to the sale of such shares, but only to the
extent of obligating itself in respect of representations, warranties,
indemnities and other agreements customarily included in secondary offering
underwriting agreements for Issuer.

        Upon receiving any request under this Section 6 from any Holder, Issuer
agrees to send a copy thereof to any other person known to Issuer to be entitled
to registration rights under this Section 6, in each case by promptly mailing
the same, postage prepaid, to the address of record of the persons entitled to
receive such copies. Notwithstanding anything to the contrary contained herein,
in no event shall Issuer be obligated to effect more than three registrations
pursuant to this Section 6 by reason of the fact that there shall be more than
one Grantee as a result of any assignment or division of this Agreement.

        7. Repurchase Right.

        (a) (i) Following the occurrence of a Repurchase Event (as defined
below), and following a request of the Holder delivered prior to an Exercise
Termination Event, Issuer (or any successor thereto) shall repurchase the Option
from the Holder at a price (the "Option Repurchase Price") equal to the amount
by which (A) the Market/Offer Price (as defined below)


                                       -7-
<PAGE>   8
exceeds (B) the Option Price, multiplied by the number of shares for which this
Option may then be exercised; and (ii) at the request of the owner of Option
Shares from time to time (the "Owner"), delivered within 90 days of such
occurrence (or such longer period as provided in Section 10), Issuer shall
repurchase such number of the Option Shares from the Owner as the Owner shall
designate at a price (the "Option Share Repurchase Price") equal to the
Market/Offer Price multiplied by the number of Option Shares so designated.

        The term "Market/Offer Price" shall mean the highest of (i) the price
per share of Common Stock at which a tender offer or exchange offer therefor has
been made, (ii) the price per share of Common Stock to be paid by any third
party pursuant to an agreement with Issuer, (iii) the highest closing price for
shares of Common Stock within the six-month period immediately preceding the
date the Holder gives notice of the required repurchase of this Option or the
Owner gives notice of the required repurchase of Option Shares, as the case
maybe, or (iv) in the event of a sale of all or a substantial portion of
Issuer's assets, the sum of the price paid in such sale for such assets and the
current market value of the remaining assets of Issuer as determined by a
nationally recognized investment banking firm selected by the Holder or the
Owner, as the case may be, and reasonably acceptable to Issuer, divided by the
number of shares of Common Stock of Issuer outstanding at the time of such sale.
In determining the Market/Offer Price, the value of consideration other than
cash shall be determined by a nationally recognized investment banking firm
selected by the Holder or Owner, as the case may be, and reasonably acceptable
to Issuer.

        (b) The Holder or the Owner, as the case may be, may exercise its right
to require Issuer to repurchase the Option or any Option Shares pursuant to this
Section 7 by surrendering for such purpose to Issuer, at its principal office,
this Agreement or certificates for Option Shares, as applicable, accompanied by
a written notice or notices stating that the Holder or the Owner, as the case
maybe, elects to require Issuer to repurchase this Option and/or the Option
Shares in accordance with the provisions of this Section 7. As promptly as
practicable, and in any event within five business days after the surrender of
the Option and/or certificates representing Option Shares and the receipt of
such notice or notices relating thereto, Issuer shall deliver or cause to be
delivered to the Holder the Option Repurchase Price and/or to the Owner the
Option Share Repurchase Price therefor or the portion thereof that Issuer is not
then prohibited under applicable law and regulation from so delivering.

        (c) To the extent that Issuer is prohibited under applicable law or
regulation from repurchasing the Option and/or the Option Shares in full, Issuer
shall immediately so notify the Holder and/or the Owner and thereafter deliver
or cause to be delivered, from time to time, to the Holder and/or the Owner, as
appropriate, the portion of the Option Repurchase Price and the Option Share
Repurchase Price, respectively, that it is no longer prohibited from delivering,
within five business days after the date on which Issuer is no longer so
prohibited; provided, however, that if Issuer at anytime after delivery of a
notice of repurchase pursuant to paragraph (b) of this Section 7 is prohibited
under applicable law or regulation or through commencement of regulatory
enforcement action from delivering to the Holder and/or the Owner, as
appropriate, the Option Repurchase Price and the Option Share Repurchase Price,
respectively, in full (and Issuer hereby undertakes to use its best efforts to
obtain all required regulatory and legal


                                       -8-
<PAGE>   9
approvals and to file any required notices as promptly as practicable in order
to accomplish such repurchase), the Holder or Owner may revoke its notice of
repurchase of the Option or the Option Shares either in whole or to the extent
of the prohibition, whereupon, in the latter case, Issuer shall promptly (i)
deliver to the Holder and/or the Owner, as appropriate, that portion of the
Option Repurchase Price or the Option Share Repurchase Price that Issuer is not
prohibited from delivering; and (ii) deliver, as appropriate, either (A) to the
Holder, a new Agreement evidencing the right of the Holder to purchase that
number of shares of Common Stock obtained by multiplying the number of shares of
Common Stock for which the surrendered Agreement was exercisable at the time of
delivery of the notice of repurchase by a fraction, the numerator of which is
the Option Repurchase Price less the portion thereof theretofore delivered to
the Holder and the denominator of which is the Option Repurchase Price, or (B)
to the Owner, a certificate for the Option Shares it is then so prohibited from
repurchasing.

        (d) For purposes of this Section 7, a Repurchase Event shall be deemed
to have occurred (i) upon the consummation of any merger, consolidation or
similar transaction involving Issuer or any purchase, lease or other acquisition
of all or a substantial portion of the assets of Issuer, other than any such
transaction which would not constitute an Acquisition Transaction pursuant to
the provisos to the final sentence of Section 2(b)(i) hereof or (ii) upon the
acquisition by any person of beneficial ownership of 50% or more of the then
outstanding shares of Common Stock, provided that no such event shall constitute
a Repurchase Event unless a Subsequent Triggering Event shall have occurred
prior to an Exercise Termination Event.

        8. Substitute Option.

        (a) In the event that prior to an Exercise Termination Event, Issuer
shall enter into an agreement (i) to consolidate with or merge into any person,
other than Grantee or one of its Subsidiaries, and shall not be the continuing
or surviving corporation of such consolidation or merger, (ii) to permit any
person, other than Grantee or one of its Subsidiaries, to merge into Issuer and
Issuer shall be the continuing or surviving corporation, but, in connection with
such merger, the then outstanding shares of Common Stock shall be changed into
or exchanged for stock or other securities of any other person or cash or any
other property or the then outstanding shares of Common Stock shall after such
merger represent less than 50% of the outstanding voting shares and voting share
equivalents of the merged company, or (iii) to sell or otherwise transfer all or
substantially all of its assets to any person, other than Grantee or one of its
Subsidiaries, then, and in each such case, the agreement governing such
transaction shall make proper provision so that the Option shall, upon the
consummation of any such transaction and upon the terms and conditions set forth
herein, be converted into, or exchanged for, an option (the "Substitute
Option"), at the election of the Holder, of either (x) the Acquiring Corporation
(as hereinafter defined) or (y) any person that controls the Acquiring
Corporation.

        (b) The following terms have the meanings indicated:

        (1) "Acquiring Corporation" shall mean (i) the continuing or surviving
        corporation of a consolidation or merger with Issuer (if other than
        Issuer), (ii) Issuer in a


                                       -9-
<PAGE>   10
        merger in which Issuer is the continuing or surviving person, or (iii)
        the transferee of all or substantially all of Issuer's assets.

                (2) "Substitute Common Stock" shall mean the common stock issued
        by the issuer of the Substitute Option upon exercise of the Substitute
        Option.

                (3) "Assigned Value" shall mean the Market/ Offer Price, as
        defined in Section 7.

                (4) "Average Price" shall mean the average closing price of a
        share of the Substitute Common Stock for the one year immediately
        preceding the consolidation, merger or sale in question, but in no event
        higher than the closing price of the shares of Substitute Common Stock
        on the day preceding such consolidation, merger or sale; provided that
        if Issuer is the issuer of the Substitute Option, the Average Price
        shall be computed with respect to a share of common stock issued by the
        person merging into Issuer or by any company which controls or is
        controlled by such person, as the Holder may elect.

        (c) The Substitute Option shall have the same terms as the Option,
provided, that if the terms of the Substitute Option cannot, for legal reasons,
be the same as the Option, such terms shall be as similar as possible and in no
event less advantageous to the Holder. The issuer of the Substitute Option shall
also enter into an agreement with the then Holder or Holders of the Substitute
Option in substantially the same form as this Agreement (after giving effect for
such purpose to the provisions of Section 9), which shall be applicable to the
Substitute Option.

        (d) The Substitute Option shall be exercisable for such number of shares
of Substitute Common Stock as is equal to the Assigned Value multiplied by the
number of shares of Common Stock for which the Option is then exercisable,
divided by the Average Price. The exercise price of the Substitute Option per
share of Substitute Common Stock shall then be equal to the Option Price
multiplied by a fraction, the numerator of which shall be the number of shares
of Common Stock for which the Option is then exercisable and the denominator of
which shall be the number of shares of Substitute Common Stock for which the
Substitute Option is exercisable.

        (e) In no event, pursuant to any of the foregoing paragraphs, shall the
Substitute Option be exercisable for more than 19.9% of the shares of Substitute
Common Stock outstanding prior to exercise of the Substitute Option.

        In the event that the Substitute Option would be exercisable for more
than 19.9% of the shares of Substitute Common Stock outstanding prior to
exercise but for this clause (e), the issuer of the Substitute Option (the
"Substitute Option Issuer") shall make a cash payment to Holder equal to the
excess of (i) the value of the Substitute Option without giving effect to the
limitation in this clause (e) over (ii) the value of the Substitute Option after
giving effect to the limitation in this clause (e). This difference in value
shall be determined by a nationally


                                      -10-
<PAGE>   11
recognized investment banking firm selected by the Holder or the Owner, as the
case may be, and reasonably acceptable to the Acquiring Corporation.

        (f) Issuer shall not enter into any transaction described in subsection
(a) of this Section 8 unless the Acquiring Corporation and any person that
controls the Acquiring Corporation assume in writing all the obligations of
Issuer hereunder.

        9. Repurchase of Substitute Option.

        (a) At the request of the holder of the Substitute Option (the
"Substitute Option Holder") delivered prior to an Exercise Termination Event,
the Substitute Option Issuer shall repurchase the Substitute Option from the
Substitute Option Holder at a price (the "Substitute Option Repurchase Price")
equal to the amount by which (i) the Highest Closing Price (as hereinafter
defined) exceeds (ii) the exercise price of the Substitute Option, multiplied by
the number of shares of Substitute Common Stock for which the Substitute Option
may then be exercised, and at the request of the owner (the "Substitute Share
Owner") of shares of Substitute Common Stock (the "Substitute Shares"), the
Substitute Option Issuer shall repurchase the Substitute Shares at a price (the
"Substitute Share Repurchase Price") equal to the Highest Closing Price
multiplied by the number of Substitute Shares so designated. The term "Highest
Closing Price" shall mean the highest closing price for shares of Substitute
Common Stock within the six-month period immediately preceding the date the
Substitute Option Holder gives notice of the required repurchase of the
Substitute Option or the Substitute Share Owner gives notice of the required
repurchase of the Substitute Shares, as applicable.

        (b) The Substitute Option Holder and the Substitute Share Owner, as the
case may be, may exercise its respective right to require the Substitute Option
Issuer to repurchase the Substitute Option and the Substitute Shares pursuant to
this Section 9 by surrendering for such purpose to the Substitute Option Issuer,
at its principal office, the agreement for such Substitute Option (or, in the
absence of such an agreement, a copy of this Agreement) and/or certificates for
Substitute Shares accompanied by a written notice or notices stating that the
Substitute Option Holder or the Substitute Share Owner, as the case may be,
elects to require the Substitute Option Issuer to repurchase the Substitute
Option and/or the Substitute Shares in accordance with the provisions of this
Section 9. As promptly as practicable, and in any event within five business
days after the surrender of the Substitute Option and/or certificates
representing Substitute Shares and the receipt of such notice or notices
relating thereto, the Substitute Option Issuer shall deliver or cause to be
delivered to the Substitute Option Holder the Substitute Option Repurchase Price
and/or to the Substitute Share Owner the Substitute Share Repurchase Price
therefor or, in either case, the portion thereof which the Substitute Option
Issuer is not then prohibited under applicable law and regulation from so
delivering.

        (c) To the extent that the Substitute Option Issuer is prohibited under
applicable law or regulation or through commencement of regulatory enforcement
action from repurchasing the Substitute Option and/or the Substitute Shares in
part or in full, the Substitute Option Issuer following a request for repurchase
pursuant to this Section 9 shall immediately so notify the Substitute Option
Holder and/or the Substitute Share Owner and thereafter deliver or


                                      -11-
<PAGE>   12
cause to be delivered, from time to time, to the Substitute Option Holder and/or
the Substitute Share Owner, as appropriate, the portion of the Substitute Option
Repurchase Price and Substitute Share Repurchase Price, respectively, which it
is no longer prohibited from delivering, within five business days after the
date on which the Substitute Option Issuer is no longer so prohibited; provided,
however, that if the Substitute Option Issuer is at any time after delivery of a
notice of repurchase pursuant to subsection (b) of this Section 9 prohibited
under applicable law or regulation or through commencement of regulatory
enforcement action from delivering to the Substitute Option Holder and/or the
Substitute Share Owner, as appropriate, the Substitute Option Repurchase Price
and the Substitute Share Repurchase Price, respectively, in full (and the
Substitute Option Issuer shall use its best efforts to receive all required
regulatory and legal approvals as promptly as practicable in order to accomplish
such repurchase), the Substitute Option Holder or Substitute Share Owner may
revoke its notice of repurchase of the Substitute Option or the Substitute
Shares either in whole or to the extent of the prohibition, whereupon, in the
latter case, the Substitute Option Issuer shall promptly (i) deliver to the
Substitute Option Holder or Substitute Share Owner, as appropriate, that portion
of the Substitute Option Repurchase Price or the Substitute Share Repurchase
Price that the Substitute Option Issuer is not prohibited from delivering; and
(ii) deliver, as appropriate, either (A) to the Substitute Option Holder, a new
Substitute Option evidencing the right of the Substitute Option Holder to
purchase that number of shares of the Substitute Common Stock obtained by
multiplying the number of shares of the Substitute Common Stock for which the
surrendered Substitute Option was exercisable at the time of delivery of the
notice of repurchase by a fraction, the numerator of which is the Substitute
Option Repurchase Price less the portion thereof theretofore delivered to the
Substitute Option Holder and the denominator of which is the Substitute Option
Repurchase Price, or (B) to the Substitute Share Owner, a certificate for the
Substitute Shares it is then so prohibited from repurchasing.

        10. Extension of Certain Periods. The 90-day or six-month period for
exercise of certain rights under each of Sections 2, 6, 7 and 14 shall be
extended: (i) to the extent necessary to obtain all regulatory approvals for the
exercise of such rights (for so long as the Holder, Owner, Substitute Option
Holder or Substitute Share Owner, as the case may be, is using its reasonable
best efforts to obtain such regulatory approval) and for the expiration of all
statutory waiting periods; and (ii) to the extent necessary to avoid liability
under Section 16(b) of the 1934 Act by reason of such exercise.

        11. Issuer Representations and Warranties. Issuer hereby represents and
warrants to Grantee as follows:

        (a) Issuer has full corporate power and authority to execute and deliver
this Agreement and to consummate the transactions contemplated hereby. The
execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby have been duly and validly authorized by the
Board of Directors of Issuer and no other corporate proceedings on the part of
Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated. This Agreement has been duly and validly executed
and delivered by Issuer.


                                      -12-
<PAGE>   13

        (b) Issuer has taken all necessary corporate action to authorize and
reserve and to permit it to issue, and at all times from the date hereof through
the termination of this Agreement in accordance with its terms will have
reserved for issuance upon the exercise of the Option, that number of shares of
Common Stock equal to the maximum number of shares of Common Stock at any time
and from time to time issuable hereunder, and all such shares, upon issuance
pursuant hereto, will be duly authorized, validly issued, fully paid,
nonassessable, and will be delivered free and clear of all claims, liens,
encumbrance and security interests and not subject to any preemptive rights.

        (c) Issuer has taken all action (including, if required, redeeming all
of the Rights or amending or terminating the Ahmanson Rights Agreement) so that
the entering into of this Option Agreement, the acquisition of shares of Common
Stock hereunder and the other transactions contemplated hereby do not and will
not result in the grant of any rights to any person under the Ahmanson Rights
Agreement or enable or require the Ahmanson Rights to be exercised, distributed
or triggered.

        12. Grantee Representations and Warranties. Grantee hereby represents
and warrants to Issuer that:

        (a) Grantee has all requisite corporate power and authority to enter
into this Agreement and, subject to any approvals or consents to herein, to
consummate the transactions contemplated hereby. The execution and delivery of
this Agreement and the consummation of the transactions contemplated hereby have
been duly authorized by all necessary corporate action on the part of Grantee.
This Agreement has been duly executed and delivered by Grantee.

        (b) The Option is not being, and any shares of Common Stock or other
securities acquired by Grantee upon exercise of the Option will not be, acquired
with a view to the public distribution thereof and will not be transferred or
otherwise disposed of except in a transaction registered or exempt from
registration under the 1933 Act.

        13. Limitation on Total Profit.

        (a) Notwithstanding anything to the contrary contained herein, in no
event shall Grantee's Total Profit (as defined below in Section 13(c) hereof)
exceed $275 million.

        (b) Notwithstanding anything to the contrary contained herein, the
Option may not be exercised for a number of shares as would, as of the date of
exercise, result in a Notional Total Profit (as defined below in Section 13(d)
hereof) of more than $275 million.

        (c) As used herein, the term "Total Profit" shall mean the aggregate
amount (before taxes) of the following: (i) the amount received by Grantee
pursuant to Issuer's repurchase of the Option (or any portion thereof) pursuant
to Section 7 hereof, (ii) (x) the amount received by Grantee pursuant to
Issuer's repurchase of Option Shares pursuant to Section 7 hereof, less (y)
Grantee's purchase price for such Option Shares, (iii) (x) the net cash amounts
received by Grantee pursuant to the sale of Option Shares (or any other
securities into which


                                      -13-
<PAGE>   14
such Option Shares shall be converted or exchanged) to any unaffiliated party,
less (y) Grantee's purchase price of such Option Shares, (iv) any amounts
received by Grantee on the transfer of the Option (or any portion thereof) to
any unaffiliated party, (v) any equivalent amount with respect to the Substitute
Option, including pursuant to Section 8(e); and (vi) the amount of any
Termination Fee actually received by Grantee pursuant to Section 8.02 of the
Merger Agreement. For purposes of this Section 13, references to Grantee shall
be deemed to include references to any affiliate of the Grantee.

        (d) As used herein, the term "Notional Total Profit" with respect to any
number of shares as to which Grantee may propose to exercise the Option shall be
the Total Profit determined as of the date of such proposed exercise assuming
that the Option were exercised on such date for such number of shares and
assuming that such shares, together with all other Option Shares held by Grantee
and its affiliates as of such date, were sold for cash at the closing market
price for the Common Stock as of the close of business on the preceding trading
day (less customary brokerage commissions).

        14. Assignment. Neither of the parties hereto may assign any of its
rights or obligations under this Agreement or the Option created hereunder to
any other person, without the express written consent of the other party, except
that in the event a Subsequent Triggering Event shall have occurred prior to an
Exercise Termination Event, Grantee, subject to the express provisions hereof,
may assign in whole or in part its rights and obligations hereunder within 90
days following such Subsequent Triggering Event (or such longer period as
provided in Section 10); provided, however, that until the date 15 days
following the date on which the Federal Reserve Board or the OTS, as applicable,
approves an application by Grantee to acquire the shares of Common Stock subject
to the Option (if such approval is required by law), Grantee may not assign its
rights under the Option except in (i) a widely dispersed public distribution,
(ii) a private placement in which no one person acquires the right to purchase
in excess of 2% of the voting shares of Issuer, (iii) an assignment to a single
person (e.g., a broker or investment banker) for the purpose of conducting a
widely dispersed public distribution on Grantee's behalf, or (iv) any other
manner approved by the Federal Reserve Board or the OTS, as applicable.

        15. Filings. Each of Grantee and Issuer will use its best efforts to
make all filings with, and to obtain consents of, all third parties and
governmental authorities necessary to the consummation of the transactions
contemplated by this Agreement, including without limitation making application
to list the shares of Common Stock issuable hereunder on the New York Stock
Exchange upon official notice of issuance and applying to the Federal Reserve
Board and/or the OTS, as applicable, for approval to acquire the shares issuable
hereunder, but Grantee shall not be obligated to apply to state banking
authorities for approval to acquire the shares of Common Stock issuable
hereunder until such time, if ever, as it deems appropriate to do so.

        16. Equitable Remedies. The parties hereto acknowledge that damages
would be an inadequate remedy for a breach of this Agreement by either party
hereto and that the obligations of the parties hereto shall be enforceable by
either party hereto through injunctive or other equitable relief.


                                      -14-
<PAGE>   15

        17. Validity. If any term, provision, covenant or restriction contained
in this Agreement is held by a court or a federal or state regulatory agency of
competent jurisdiction to be invalid, void or unenforceable, the remainder of
the terms, provisions and covenants and restrictions contained in this Agreement
shall remain in full force and effect, and shall in no way be affected, impaired
or invalidated. If for any reason such court or regulatory agency determines
that the Holder is not permitted to acquire, or Issuer is not permitted to
repurchase pursuant to Section 7, the full number of shares of Common Stock
provided in Section 1(a) hereof (as adjusted pursuant to Section 1(b) or 5
hereof), it is the express intention of Issuer to allow the Holder to acquire or
to require Issuer to repurchase such lesser number of shares as maybe
permissible, without any amendment or modification hereof.

        18. Notices. All notices, requests, claims, demands and other
communications hereunder shall be deemed to have been duly given when delivered
in person, by cable, telegram, telecopy or telex, or by registered or certified
mail (postage prepaid, return receipt requested) at the respective addresses of
the parties set forth in the Merger Agreement.

        19. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, regardless of the laws that
might otherwise govern under applicable principles of conflicts of laws thereof.

        20. Counterparts. This Agreement may be executed in two counterparts,
each of which shall be deemed to be an original, but all of which shall
constitute one and the same agreement.

        21. Expenses. Except as otherwise expressly provided herein, each of the
parties hereto shall bear and pay all costs and expenses incurred by it or on
its behalf in connection with the transactions contemplated hereunder, including
fees and expenses of its own financial consultants, investment bankers,
accountants and counsel.

        22. Entire Agreement. Except as otherwise expressly provided herein or
in the Merger Agreement, this Agreement contains the entire agreement between
the parties with respect to the transactions contemplated hereunder and
supersedes all prior arrangements or understandings with respect thereof,
written or oral. The terms and conditions of this Agreement shall inure to the
benefit of and be binding upon the parties hereto and their respective
successors and permitted assigns. Nothing in this Agreement, expressed or
implied, is intended to confer upon any party, other than the parties hereto,
and their respective successors and permitted assigns, any rights, remedies,
obligations or liabilities under or by reason of this Agreement, except as
expressly provided herein.

        23. Capitalized Terms. Capitalized terms used in this Agreement and not
defined herein shall have the meanings assigned thereto in the Merger Agreement.

                                      -15-
<PAGE>   16

        IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed on its behalf by its officers thereunto duly authorized, all as of the
date first above written.

                               H.F. AHMANSON & COMPANY


                               By:
                                   -------------------------------------------
                               Name:  Bruce G. Willison
                               Title: President and Chief
                                      Operating Officer


                               WASHINGTON MUTUAL, INC.


                               By:
                                   -------------------------------------------
                               Name:  Fay L. Chapman
                               Title: Executive Vice President





                                      -16-