INDYMAC MORTGAGE HOLDINGS INC
S-8, 1998-06-03
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>
 
     As filed with the Securities and Exchange Commission on June 3, 1998

                                                 Registration No. 333-


                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549
                           ________________________
                                   FORM S-8

                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

                           ________________________

                        INDYMAC MORTGAGE HOLDINGS, INC.
                    (formerly INMC Mortgage Holdings, Inc.)
            (Exact name of registrant as specified in its charter)


DELAWARE                             95-3983415
(State or Other Jurisdiction of      (I.R.S. Employer Identification No.)
Incorporation or Organization)                

155 NORTH LAKE AVENUE
PASADENA, CALIFORNIA                 91101-1857
(Address of Principal                (Zip Code)
Executive Offices)          

                          INMC MORTGAGE HOLDINGS, INC.
                           1998 STOCK INCENTIVE PLAN
                           (Full Title of the Plan)

                           _______________________


                               MICHAEL W. PERRY
                     PRESIDENT AND CHIEF OPERATING OFFICER
                        INDYMAC MORTGAGE HOLDINGS, INC.
                             155 NORTH LAKE AVENUE
                          PASADENA, CALIFORNIA  91101
                    (Name and Address of Agent for Service)

                                (800) 669-2300
         (Telephone Number, Including Area Code, of Agent for Service)

                      CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
====================================================================================================================================
Title of securities to be      Amount to be           Proposed maximum           Proposed maximum           Amount of
      registered                registered             offering price           aggregate offering       registration fee
                                                          per share                   price 
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                           <C>                   <C>                       <C>                       <C> 
Common Stock, $.01 par 
value....................      6,400,000 shares (1)      $23.5938    (2)         $151,000,320    (2)          $44,546     (3) 
====================================================================================================================================
</TABLE> 

(1)  Pursuant to Rule 416, this Registration Statement also covers an
     indeterminable number of shares of Common Stock which may become subject to
     the Plan by reasons of certain events specified in the Plan.

(2)  Estimated solely for the purpose of calculating the registration fee in
     accordance with Rule 457(c), based on the average of the high and low sales
     prices for the Common Stock as reported by the New York Stock Exchange on
     May 29, 1998

(3)  In accordance with Rule 457(h), the filing fee is based on the maximum
     number of the registrant's securities issuable under the Plan that are
     covered by this Registration Statement. The filing fee has been paid by
     wire transfer to the Securities and Exchange Commission's account at Mellon
     Bank.
<PAGE>
 
                                  PART I

            INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

   The document(s) containing the information specified in Part I of Form S-8
will be sent or given to participants as specified by Rule 428(b)(1) of the
Securities Act of 1933, as amended.  These documents and the documents
incorporated by reference into this Registration Statement pursuant to Item 3 of
Part II of this Registration Statement, taken together, constitute a prospectus
that meets the requirements of Section 10(a) of the Securities Act of 1933, as
amended.

                                  PART II

            INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.     INCORPORATION OF DOCUMENTS BY REFERENCE.

   The following documents, which IndyMac Mortgage Holdings, Inc., f/k/a INMC
Mortgage Holdings, Inc. (the "Company"), previously filed with the Securities
and Exchange Commission pursuant to Section 13 of the Securities Exchange Act of
1934, as amended, are hereby incorporated by reference into this Registration
Statement:

   (a)    The Company's Annual Report on Form 10-K for the year ended December
          31, 1997;

   (b)    The Company's Quarterly Report on Form 10-Q for the quarter ended
          March 31, 1998;

   (c)    The description of the Company's common stock, $.01 par value per
          share (the "Common Stock"), contained in its Registration Statement on
          Form 8-B dated April 10, 1987, and any amendment or report filed for
          the purpose of updating such description.

   All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Securities Exchange Act of 1934, as amended, subsequent to the date
hereof and prior to the termination of the offering of the securities registered
pursuant to this Registration Statement shall be deemed to be incorporated by
reference into this Registration Statement and to be part hereof from the date
of filing of such documents.  Any statement contained in a document incorporated
or deemed to be incorporated by reference herein shall be deemed to be modified
or superseded for purposes of this Registration Statement to the extent that a
statement contained herein or in any other subsequently filed document which
also is or is deemed to be incorporated by reference herein modifies or
supersedes such statement.  Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Registration Statement.

ITEM 4.     DESCRIPTION OF SECURITIES.
 
   Not applicable.

                                       2
<PAGE>
 
ITEM 5.     INTERESTS OF EXPERTS AND COUNSEL.

   The legality of the shares of the Company's Common Stock offered hereby has
been passed upon by Richard H. Wohl, Senior Executive Vice President, General
Counsel and Secretary of the Company.  As of June 1, 1998, Mr. Wohl beneficially
owned restricted and unrestricted shares of Common Stock of the Company, as well
as options to purchase shares of Common Stock of the Company.

ITEM 6.     INDEMNIFICATION OF DIRECTORS AND OFFICERS.

   The Company's Certificate of Incorporation eliminates personal liability of
directors to the Company or its shareholders for monetary damages for breach of
fiduciary duty as a director, except for: (i) any breach of the duty of loyalty
to the Company or its shareholders; (ii) acts or omissions not in good faith or
which involve intentional misconduct or knowing violations of law; (iii)
liability under Section 174 of the Delaware General Corporation Law relating to
certain unlawful dividends and stock repurchases; or (iv) any transaction from
which the director derived an improper personal benefit.  The Certificate also
provides that the Company shall indemnify and advance expenses to each director,
officer, employee and agent to the fullest extent permitted by the Delaware
General Corporation Law.

   Section 145 of the General Corporation Law of the State of Delaware, as
amended, provides that under certain circumstances a corporation may indemnify
any person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding whether civil,
criminal, administrative or investigative, by reason of the fact that he or she
is or was a director, officer, employee or agent of the Company or is or was
serving at its request in such capacity in another corporation or business
association, against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by him or her in
connection with such action, suit or proceeding if he or she acted in good faith
and in a manner he or she reasonably believed to be in or not opposed to the
best interests of the Company and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his or her conduct was unlawful.

   As permitted by Section 145 of the General Corporation Law of Delaware, the
Company's Bylaws provide for indemnification of directors, officers, employees
and agents of the Company to the fullest extent authorized by Delaware law
against expenses (including attorney's fees) and other amounts paid in
settlement actually and reasonably incurred by them in connection with any
threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative, in which any such person was or is a
party or is threatened to be made a party.  The right to indemnification
includes the right to be paid the expenses incurred in defending or
investigating a threatened or pending action, suit or proceeding in advance of
the final disposition of such action, suit or proceeding; provided that, if
required by Delaware law, payment of expenses in advance to an officer or
director shall be conditioned upon receipt by the Company of an undertaking by
or on behalf of such director or officer to repay such amount if it is
ultimately determined that he is not entitled to indemnification.  The
advancement of expenses, as well as indemnification, pursuant to the Company's
Bylaws is not exclusive of any other rights which those seeking indemnification
or advancement of expenses from the Company may have.  The Company also
maintains an insurance policy pursuant to which its directors and officers are
insured against certain liabilities which might arise out of their relationship
with the Company as directors and officers.

                                       3
<PAGE>
 
ITEM 7.     EXEMPTION FROM REGISTRATION CLAIMED.

   Not Applicable.

ITEM 8.     EXHIBITS

   4(a)  Certificate of Incorporation of the Company, as amended.

   4(b)  By-Laws of the Company (incorporated herein by reference to Exhibit 3.2
                                                                     -----------
         to the Company's Quarterly Report on Form 10-Q for the quarter ended
         June 30, 1997).

   5     Opinion of Richard H. Wohl, General Counsel of the Company, as to the
         legality of the Common Stock being registered.

   23(a) Consent of Richard H. Wohl (included as part of Exhibit 5).
                                                         ---------  

   23(b) Consent of Grant Thornton LLP.

   24    Power of Attorney (included on page 6).

ITEM 9.     UNDERTAKINGS

   The undersigned registrant hereby undertakes:

   (a)(1)  To file, during any period in which offers or sales are being
   made, a post-effective amendment to this Registration Statement:

         (i) To include any prospectus required by Section 10(a)(3) of the
         Securities Act of 1933, unless the information required to be included
         in such post-effective amendment is contained in periodic reports filed
         by the registrant pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934, as amended, that are incorporated by reference in
         the Registration Statement;

         (ii) To reflect in the prospectus any facts or events arising after the
         effective date of the Registration Statement (or the most recent post-
         effective amendment thereof) which, individually or in the aggregate,
         represent a fundamental change in the information set forth in the
         Registration Statement, unless the information required to be included
         in such post-effective amendment is contained in periodic reports filed
         by the registrant pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934, as amended, that are incorporated by reference in
         the Registration Statement;

                                       4
<PAGE>
 
       (iii)   To include any material information with respect to the plan of
       distribution not previously disclosed in the Registration Statement or
       any material change to such information in the Registration Statement.

     (2)       That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.

     (3)       To remove from registration by means of a post-effective
     amendment any of the securities being registered which remain unsold at the
     termination of the offering.

(b)  That, for purposes of determining any liability under the Securities Act of
1933, each filing of the registrant's annual report pursuant to Section 13(a) or
15(d) of the Securities Exchange Act of 1934, as amended, that is incorporated
by reference in this Registration Statement shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

(c)  Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

                                       5
<PAGE>
 
                                  SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the Company
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Pasadena, State of California, on the 3rd day of
June, 1998.

                                        INDYMAC MORTGAGE HOLDINGS, INC.

                                        By:  /s/ Michael W. Perry
                                           ----------------------------
                                           Michael W. Perry
                                           President and Chief Operating Officer

                                  POWER OF ATTORNEY

   KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Michael W. Perry and Richard H. Wohl his or her
true and lawful attorneys-in-fact and agents, with full power of substitution
and resubstitution, for him or her and in his or her name, place and stead, in
any and all capacities, to sign any and all amendments (including post-effective
amendments) to this Registration Statement and to each Registration Statement
amended hereby, and to file the same, with all exhibits thereto and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as he or she might or could do in person hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
or his or her substitute or substitutes, may lawfully do or cause to be done by
virtue thereof.

   Pursuant to the requirements of the Securities Act of 1933, this Registration
Statement has been signed below by the following persons in the capacities
indicated on the 3rd day of June, 1998.

              Signature                                Title
              ---------                                ----- 


      /s/  David S. Loeb
    ____________________________
           David S. Loeb                Chairman of the Board of Directors 
                                           
                                     
      /s/  Angelo R. Mozilo       
    ____________________________     
          Angelo R. Mozilo              Vice Chairman of the Board of Directors 
                                              and Chief Executive Officer 
                                               
      /s/  Michael W. Perry       
    ____________________________     
          Michael W. Perry              President, Chief Operating Officer 
                                                    and Director
                                     
                                     

                                       6
<PAGE>
 
             Signature                         Title
             ---------                         -----
                                     
    /s/ James P. Gross         
    ____________________________     
           James P. Gross            Executive Vice President and 
                                       Chief Financial Officer      
                                                 
    /s/ Lyle E. Gramley        
    ____________________________     
          Lyle E. Gramley                      Director 

                                       
    /s/ Thomas J. Kearns       
    ____________________________     
          Thomas J. Kearns                     Director 

                                                        
    /s/ Frederick J. Napolitano    
    ____________________________     
      Frederick J. Napolitano                  Director 
                                               

                                       7
<PAGE>
 
                                  EXHIBIT INDEX
<TABLE> 
<CAPTION> 

Exhibit No.      Description
- -----------      -----------
<S>              <C> 
4(a)             Certificate of Incorporation of the Company, as amended

4(b)             By-Laws of the Company, as amended (incorporated herein by reference
                 to Exhibit 3.2 to the Company's Quarterly Report on Form 10-Q for the
                    -----------
                 quarter ended June 30, 1997)

5                Opinion of Richard H. Wohl, General Counsel of the Company, as to the
                 legality of the Common Stock being registered

23(a)            Consent of Richard H. Wohl (included as part of Exhibit 5)
                                                                 ---------
23(b)            Consent of Grant Thornton LLP
                                            
24               Power of Attorney (included on page 6)
</TABLE> 

                                       8

<PAGE>
 
                                                                    EXHIBIT 4(a)
                                                                    ------------
                                                                                
                          CERTIFICATE OF INCORPORATION
                                       OF
                     COUNTRYWIDE MORTGAGE INVESTMENTS, INC.

         THE UNDERSIGNED, in order to form a corporation for the purposes
hereinafter stated, under and pursuant to the provisions of the General
Corporation Law of the State of Delaware, does hereby certify as follows:

                                   ARTICLE I

                                      NAME
                                      ----
                                        
         The name of the Corporation is:  Countrywide Mortgage Investments, Inc.
(the "Corporation").

                                   ARTICLE II

                                REGISTERED AGENT
                                ----------------

         The address of the registered office of the Corporation in the State of
Delaware is:  Corporation Trust Center, 1209 Orange Street, New Castle County,
Wilmington, Delaware 19801.  The name of the Corporation's registered agent at
such registered office is The Corporation Trust Company.
<PAGE>
 
                                  ARTICLE III

                                    PURPOSE
                                    -------

         The purpose for which the Corporation is formed is to engage in any
lawful act or activity for which corporations may be organized under the General
Corporation Law of the State of Delaware as now or hereafter in force.

                                   ARTICLE IV

                                 CAPITAL STOCK
                                 -------------
                                        
           Section 1.  The total number of shares of capital stock which the
 Corporation shall have authority to issue is Thirty Million (30,000,000),
 consisting of Thirty Million (30,000,000) shares of Common Stock having a par
 value of $0.01 per share.

           Section 2.  All persons who shall acquire stock in the Corporation
 shall acquire the same subject to the provisions of this Certificate of
 Incorporation and the Bylaws of the Company.

           Section 3.  Each share of Common Stock shall entitle the owner
 thereof to vote at the rate of one (1) vote for each share of Common Stock
 held.

                                       2
<PAGE>
 
                                   ARTICLE V

                     PROVISIONS FOR DEFINING, LIMITING AND

                        REGULATING CERTAIN POWERS OF THE

                        CORPORATION AND OF THE DIRECTORS

                                AND STOCKHOLDERS
                                ----------------

          Section 1.  The number of Directors shall be determined by or in the
manner provided in the Bylaws of the Corporation, as they may be amended from
time to time.  The names and mailing addresses of the persons who shall serve as
directors until the first annual meeting of stockholders or until their
successors are duly elected and qualified are:

          David S. Loeb
          Countrywide Mortgage Investments, Inc.
          155 North Lake Avenue
          Pasadena, California  91109

          Angelo R. Mozilo
          Countrywide Mortgage Investments, Inc.
          155 North Lake Avenue
          Pasadena, California  91109

          Frederick J. Napolitano
          Pembroke Enterprises, Inc.
          281 Independence Boulevard
          Suite 626
          Virginia Beach, Virginia  23462

          Harley W. Snyder
          Harley Snyder Company
          407 East Lincoln Way
          Valparaiso, Indiana  46383

          Jack Carlson
          9901 Bluegrass Road
          Potomac, Maryland  20854

                                       3
<PAGE>
 
          Robert J. Donato
          PaineWebber Incorporated
          700 South Flower Street
          Los Angeles, California  90017

The powers of the Incorporator shall terminate upon the filing of this
Certificate of Incorporation.

          Section 2.  The Board of Directors of the Corporation is hereby
empowered to authorize the issuance from time to time of shares of capital
stock, whether now or hereafter authorized, for such consideration as the Board
of Directors may deem advisable, subject to such limitations as may be set forth
in this Certificate of Incorporation or in the Bylaws of the Corporation or in
the Delaware General Corporation Law.

          Section 3.  No holder of shares of capital stock of the Corporation
shall, as such holder, have any right to purchase or subscribe for any shares of
the capital stock of the Corporation or any other security of the Corporation
which it may issue or sell (whether out of the number of shares authorized by
this Certificate of Incorporation, or out of any shares of the capital stock of
the Corporation hereafter authorized or acquired by it after the issue thereof,
or otherwise) other than such right, if any, as the Board of Directors, in its
discretion, may determine.

                                       4
<PAGE>
 
          Section 4.  A Director of this Corporation shall not be personally
liable to the Corporation or its stockholders for monetary damages for breach of
fiduciary duty as a Director, except for liability (i) for any breach of the
Directors's duty of loyalty to the Corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the Delaware General
Corporation Law, or (iv) for any transaction from which the Director derived any
improper personal benefit.  If the Delaware General Corporation Law is amended
after the date hereof to permit the further elimination or limitation of the
personal liability of directors, then the liability of a Director of the
Corporation shall be eliminated or limited to the fullest extent permitted by
the Delaware General Corporation Law, as so amended.  Any repeal or modification
of this Section 4 of Article V by the stockholders of the Corporation shall not
adversely affect any right or protection of a Director of the Corporation in
respect of any act or omission occurring prior to the time of such repeal or
modification.

          Section 5.  The Corporation shall indemnify and shall advance expenses
to each Director, officer, employee and agent of this Corporation to the fullest
extent permitted by the Delaware General Corporation Law as now or hereafter in

                                       5
<PAGE>
 
force.  The indemnification provided by this Section shall not be deemed
exclusive of any other rights to which those seeking indemnification or
advancement of expenses may be entitled under any bylaw, agreement, vote of
stockholders or disinterested directors or otherwise, and the Board of Directors
is expressly authorized to adopt bylaws and/or enter into agreements whereby the
Corporation agrees to indemnify and advance expenses to its Directors, officers,
employees and agents.

          Section 6.  The Board of Directors of the Corporation may make, alter
or repeal from time to time any of the Bylaws of the Corporation except any
particular Bylaw which is specified in the Bylaws as not subject to alteration
or repeal by the Board of Directors.

          Section 7.  The Board of Directors may authorize, subject to such
approval of stockholders and other conditions, if any, as may be required by any
applicable statute, bylaw, rule or regulation, the execution and performance by
the Corporation of one or more agreements with any person, corporation,
association, company, trust, partnership (limited or general) or other
organization whereby, subject to the supervision and control of the Board of
Directors, any such other person, corporation, association, company, trust,
partnership (limited or general), or other organization shall 

                                       6
<PAGE>
 
render or make available to the Corporation managerial, investment, advisory
and/or related services, office space and other services and facilities
(including the management or supervision of the investments of the Corporation)
upon such terms and conditions as may be provided in such agreement or
agreements (including the compensation payable thereunder by the Corporation).

          Section 8.  The Board of Directors may authorize any agreement of the
character described in Section 7 of this Article V or other contract or
transaction with any one or more Directors or officers or between the
Corporation and any other corporation, partnership (limited or general),
association, trust, company or other organization in which one or more of the
Corporation's Directors or officers are directors or officers, or similar
parties, or otherwise have a financial interest, and no such agreement, contract
or transaction shall be void or voidable solely by reason of the existence of
any such relationship or solely because the Director or officer so interested is
present at or participates in the meeting of the Board of Directors or committee
thereof which authorizes the agreement, contract or transaction, or solely
because such Director's votes are counted for such purpose if:  (i) the material
facts as to the Director's or officer's relationship or interest and as to the
agreement or transaction are disclosed or are known to the 

                                       7
<PAGE>
 
Board of Directors or such committee and the Board of Directors or committee in
good faith authorizes, approves or ratifies the agreement, contract or
transaction by the affirmative vote of a majority of the disinterested
Directors, even though the disinterested Directors be less than a quorum; or
(ii) the material facts as to such Director's or Officer's relationship or
interest and as to the agreement or transaction are disclosed or are known to
the stockholders entitled to vote thereon, and the agreement, contract or
transaction is authorized, approved or ratified in good faith by a majority of
votes cast by the stockholders entitled to vote other than the votes of shares
owned of record or beneficially by the interested Director or officer; or (iii)
the agreement, contract or transaction is fair to the Corporation as of the time
it is authorized, approved or ratified by the Board of Directors, a committee
thereof or the stockholders. Any Director of the Corporation who is also a
director, officer, stockholder or member of such other entity may be counted in
determining the existence of a quorum at any meeting of the Board of Directors
or of a committee which authorizes any such agreement, contract or transaction.
If such a Director votes at a meeting to approve or disapprove a transaction as
described in this Section, such vote shall not affect the validity of such a
transaction provided the provisions of this Section are otherwise satisfied.

                                       8
<PAGE>
 
          Section 9.  Any action required or permitted to be taken by the
stockholders of the Corporation must be effected at a duly called annual meeting
or at a special meeting of stockholders of the Corporation.  No action may be
taken by the written consent of the stockholders.  Action need not be by written
ballot unless the chairman of the meeting shall so direct.

          Section 10.  The enumeration and definition of particular powers of
the Board of Directors included in the foregoing shall in no way be limited or
restricted by reference to or inference from the terms of any other clause of
this or any other Article of the Certificate of Incorporation of the
Corporation, or construed as or deemed by inference or otherwise in any manner
to exclude or limit the powers conferred upon the Board of Directors under the
General Corporation Law of the State of Delaware as now or hereafter in force.

                                   ARTICLE VI

               RESTRICTION ON ACQUISITION AND TRANSFER OF SHARES
               -------------------------------------------------

          Section 1.  Whenever it is deemed by the Board of Directors to be
prudent in protecting the status of the Corporation as a "real estate investment
trust" under the Internal Revenue Code of 1986, as amended (the "Code"), the

                                       9
<PAGE>
 
Board of Directors may require to be filed with the Corporation as a condition
to permitting any proposed transfer, and/or the registration of any transfer, of
shares of the Corporation a statement or affidavit from any proposed transferee
setting forth the number of shares already owned after application of the
attribution rules (the "Attribution Rules") of Section 544 of the Code by the
transferee and any related person(s) specified in the form prescribed by the
Board of Directors for that purpose.  All contracts for the sale or other
transfer of shares of the Corporation shall be subject to this provision.

          Section 2.  As a condition to the transfer and/or registration of
transfer of any shares of capital stock of the Corporation which would result in
any stockholder owning, directly or indirectly, shares in excess of 9% of the
outstanding shares of capital stock of the Corporation, the transferee of such
shares shall file with the Corporation an affidavit setting forth the number of
shares of capital stock of the Corporation owned directly and indirectly by the
person filing the affidavit.  For purposes of this Section, shares of capital
stock not owned directly shall be deemed to be owned indirectly by a person if
that person or a group of which he is a member would be the beneficial owner of
such shares for purposes of Rule 13d-3, or any successor rule thereto,
promulgated by the Securities and Exchange Commission under 

                                       10
<PAGE>
 
the Securities Exchange Act of 1934 (the "Exchange Act"), and/or would be
considered to own such shares by reason of the Attribution Rules. The affidavit
to be filed with the Corporation shall set forth all information required to be
reported in returns filed by stockholders under Regulation 1.857-9 issued by the
Internal Revenue Service, or similar provisions of any successor regulation, and
in reports to be filed under Section 13(d) of the Exchange Act. The affidavit,
or an amendment thereto, must be filed with the Corporation within 10 days after
demand therefor and in any event at least 15 days prior to any transfer,
registration of transfer or transaction which, if consummated, would cause the
filing person to hold shares in excess of 9% of the outstanding shares of
capital stock of the Corporation. No transfer nor any registration of any
purported transfer in violation of the notice provisions of this Section shall
be valid or be given effect. Notwithstanding the foregoing, compliance with the
requirements of this Section 2 shall not validate any purported transfer which
would result in any stockholder owning, directly or indirectly, shares in excess
of the "Limit" as defined in Section 4 of this Article VI.

          Section 3.  Any acquisition of shares of capital stock of the
Corporation that would result in any stockholder owning, directly or indirectly,
shares in excess of the "Limit" as defined in Section 4 of this Article VI shall
be 

                                       11
<PAGE>
 
void ab initio to the fullest extent permitted under applicable law and the
intended transferee of "Excess Shares," as defined in Section 4 of this Article
VI, shall be deemed never to have had an interest therein. If the foregoing
provision is determined to be void, voidable or invalid by virtue of any legal
decision, statute, rule or regulation, then the transferee of such shares shall
be deemed to have acted as agent on behalf of the Corporation in acquiring such
shares and to hold such shares on behalf of the Corporation.

          Section 4.  Notwithstanding any other provision hereof to the
contrary, and subject to the provisions of Section 5 of this Article VI, no
person, or persons acting as a group, shall at any time directly or indirectly
acquire ownership in the aggregate of more than 9.8% of the outstanding shares
of capital stock of the Corporation (the "Limit").  Shares which would, but for
this Section 4, be owned by a person or a group of persons in excess of the
Limit at any time shall be deemed "Excess Shares."  For the purposes of
determining and dealing with Excess Shares, the term "ownership" shall be
defined to include shares of capital stock constructively owned by a person
under the Attribution Rules and shall also include shares of capital stock
beneficially owned by a person for purposes of Rule 13d-3, or any successor rule
thereto, promulgated by the Securities and Exchange Commission under the
Exchange Act and the term 

                                       12
<PAGE>
 
"group" shall have the same meaning as that term has for purposes of Section
13(d)(3) of such Act. All shares of the Corporation which any person has the
right to acquire upon exercise of outstanding rights, options and warrants, and
upon conversion of any securities convertible into shares, if any, shall be
considered outstanding for purpose of the Limit if such inclusion will cause
such person to own more than the Limit. Unless otherwise required by applicable
law, the Corporation shall refuse to transfer or register the transfer of, and
shall instruct the transfer agent of the Corporation to refuse to transfer or
register the transfer of, shares to the extent that, as a result of such
transfer or registration of transfer, any person would hold Excess Shares.

          Section 5.  The Limit set forth in Sections 3 and 4 of this Article VI
and the filing requirements of Section 2 of this Article VI shall not apply to
the acquisition of shares of the Corporation by the Corporation, by an
underwriter in connection with a public offering of shares of the Corporation,
or in any transaction involving the issuance of shares by the Corporation, in
which the Board of Directors determines that the underwriter or other person or
party initially acquiring such shares will timely distribute such shares to or
among others such that, following such distribution, none of such shares will be
Excess Shares.  The Board of Directors in its discretion may exempt from the
Limit 

                                       13
<PAGE>
 
under Sections 3 and 4 of this Article VI and from the filing requirements of
Section 2 of this Article VI ownership or transfers of certain designated shares
while owned by or transferred to any subsidiary of this Corporation or to any
other person in connection with a reorganization, recapitalization, merger,
liquidation or similar transaction approved by the Board of Directors, provided
that such person has given the Board of Directors evidence and assurances
acceptable to the Board of Directors that the qualification of the Corporation
as a "real estate investment trust" under the Code would not be jeopardized
thereby.

          Section 6.  Notwithstanding Sections 3 and 4 of this Article VI, if at
any time more than 9.8% of the shares of capital stock of the Corporation has
become concentrated in the hands of a "beneficial owner" (as such term is
defined for purposes of Rule 13d-3, or any successor rule thereto promulgated by
the Securities and Exchange Commission, under the Exchange Act), such beneficial
owner and each of his "affiliates" (as such term is defined on December 1, 1986
in Rule 12b-2 under the Exchange Act) owning any shares of capital stock of the
Corporation shall be deemed to have offered to sell to the Corporation or its
designee, on a date fixed by the Corporation, as specified in the Corporation's
notice of its or its designee's acceptance of such offer of sale, such a number
of shares of capital stock sufficient, in 

                                       14
<PAGE>
 
the opinion of the Board of Directors, to maintain or bring the direct or
indirect ownership of shares of capital stock of the Corporation of such
beneficial owner to no more than the Limit. The price at which the Corporation
or its designee may purchase the outstanding shares of capital stock of the
Corporation pursuant to the preceding sentence of this Section (the "Purchase
Price") shall be equal to the closing sales price for the shares, if then listed
on a national securities exchange, or the average of the closing sales prices
for the shares if then listed on more than one national securities exchange, or
if the shares are not then listed on a national securities exchange, the latest
bid quotation for the shares if then traded over-the-counter, on the last
business day immediately preceding the day on which the Corporation's notice of
its acceptance of the beneficial owner's and/or his affiliates' offer of sale is
sent, or, if no such closing sales prices or quotations are available, then the
Purchase Price shall be equal to the net asset value of such stock (determined
on the basis of the fair market value of the assets of the Corporation) as
determined by the Board of Directors in accordance with the provisions of
applicable law. The Purchase Price of any shares acquired by the Corporation or
its designee shall be paid, at the option of the Corporation, in cash or in the
form of an unsecured, subordinated promissory note of the Corporation or its
designee bearing interest and having a term to maturity (to be 

                                       15
<PAGE>
 
not less than five nor more than twenty years) as shall be determined by the
Board of Directors. Payment of the Purchase Price shall be made at such time and
in such manner as may be determined by the Board of Directors and specified in
the notice of acceptance sent to the beneficial owner and/or his affiliates.
From and after the date fixed for purchase by the Board of Directors and the
tender by the Corporation of the Purchase Price therefor, each as specified in
the Corporation's notice of its acceptance of the offer of sale, the holder of
any shares to be so purchased shall cease to be entitled to any rights as a
holder of such shares, excepting only the right to payment of the Purchase Price
fixed as aforesaid.

          Section 7.  Nothing contained in this Article VI or in any other
provision hereof shall limit the authority of the Board of Directors to take
such other action as it deems necessary or advisable to protect the Corporation
and the interests of its stockholders by preservation of the Corporation's
status as a "real estate investment trust" under the Code.

          Section 8.  For purposes of this Article VI only, the term "person"
shall include individuals, corporations, limited partnerships, general
partnerships, joint stock companies or associations, joint ventures,
associations, 

                                       16
<PAGE>
 
consortia, companies, trusts, banks, trust companies, land trusts, common law
trusts, business trusts and other entities, and governments and agencies and
political subdivisions thereof; provided, however, that such term shall not
include this Corporation or any of its subsidiaries.

          Section 9.  If any provision of this Article VI or any application of
any such provision is determined to be invalid by any federal or state court
having jurisdiction over the issues, the validity of the remaining provisions
shall not be affected and other applications of such provision shall be affected
only to the extent necessary to comply with the determination of such court.

                                  ARTICLE VII

                                  AMENDMENTS
                                  ----------
                                        
          The Corporation reserves the right to adopt, repeal, rescind, alter,
restate or amend in any respect any provision contained in this Certificate of
Incorporation in the manner now or hereafter prescribed by applicable law, and
all rights conferred on stockholders herein are granted subject to this
reservation.

                                       17
<PAGE>
 
                                  ARTICLE VIII

                                  INCORPORATOR
                                  ------------
                                        
          The name of the incorporator is Andrea J. Melville.  The
Incorporator's mailing address is 400 South Hope Street, Los Angeles, California
90071-2899.

          IN WITNESS WHEREOF, the undersigned incorporator of Countrywide
Mortgage Investments, Inc. hereby executes the foregoing Certificate of
Incorporation and acknowledges the same to be her act and further acknowledges
that, to the best of her knowledge, the matters and facts set forth therein are
true in all material respects under the penalties of perjury.

Dated this   19th   day of   January  , 1987.
             ----            -------         

                              \s\ Andrea Melville
                              -------------------

                                       18
<PAGE>
 
                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                     COUNTRYWIDE MORTGAGE INVESTMENTS, INC.

                                        
Countrywide Mortgage Investments, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware,
hereby certifies as follows:

        1.  That at a meeting of the Board of Directors of Countrywide Mortgage
Investments, Inc., (the "Corporation") resolutions were duly adopted setting
forth a proposed amendment of the Certificate of Incorporation of said
corporation, declaring said amendment to be advisable and calling for the
proposal to be presented to the shareholders of the Corporation at a Special
Meeting of the Shareholders.  The resolution setting forth the proposed
amendment is as follows:

     RESOLVED, That the Certificate of Incorporation of the Corporation be
     amended by revising Article IV, Section 1 thereof so that, as amended,
     Article IV, Section 1 shall read as follows:

                                 "CAPITAL STOCK
                                  -------------
                                        
        Section 1.  The total number of shares of capital stock which the
     Corporation shall have authority to issue is Sixty Million (60,000,000),
     consisting of Sixty Million (60,000,000) shares of Common Stock having a
     par value of $0.01 per share."

        2.  That thereafter, the Special Meeting of the Stockholders, held on
December 9, 1993, of said corporation was duly called and held, upon notice in
accordance with Section 222 of the General Corporation Law of the State of
Delaware at which meeting the necessary number of shares as required by statue
were voted in favor of the amendment.

        3.  That said amendment was duly adopted in accordance with the
provisions of Section 242 of the General Corporation Law of the State of
Delaware.

                                       19
<PAGE>
 
        IN WITNESS WHEREOF, said Countrywide Mortgage Investments, Inc. has
caused this certificate to be signed by Angelo R. Mozilo, its President, and
Sandor E. Samuels, its Secretary, this 11th day of December, 1993.


                         BY:   \s\ Angelo R. Mozilo
                               --------------------------
                               Angelo R. Mozilo
                               President

ATTEST:


\s\ Sandor E. Samuels  
- -----------------------       
Sandor E. Samuels
Secretary

                                       20
<PAGE>
 
                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                     COUNTRYWIDE MORTGAGE INVESTMENTS, INC.

                                        
Countrywide Mortgage Investments, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware,
hereby certifies as follows:

        1.  That at a meeting of the Board of Directors of Countrywide Mortgage
Investments, Inc., (the "Corporation") resolutions were duly adopted setting
forth proposed amendments of the Certificate of Incorporation of said
Corporation, declaring said amendments to be advisable and calling for the
proposal to be presented to the stockholders of the Corporation at the Annual
Meeting of the Stockholders.  The resolutions setting forth the proposed
amendments are as follows:

     RESOLVED, That the Certificate of Incorporation of the Corporation be
     amended by revising ARTICLE I so that, as amended, ARTICLE I shall read as
     follows:
                                   ARTICLE I

                                     "NAME"
                                     ------
                                        
            The name of the Corporation is: CWM Mortgage Holdings, Inc. (the
          "Corporation").

     RESOLVED FURTHER, That the Certificate of Incorporation of the Corporation
     be further amended by adding a new ARTICLE VII to read as follows and by
     renumbering the existing ARTICLES VII and VIII as ARTICLES VIII and IX,
     respectively:

                                  ARTICLE VII

                 ACQUISITION OF SHARES BY CERTAIN ORGANIZATIONS
                 ----------------------------------------------

          Section 1.  Whenever it is deemed by the Board of Directors to be
     prudent in avoiding

          (a)  the direct or indirect imposition of  a penalty tax on the
          Corporation (including the imposition of an entity-level tax on one or
          more real estate mortgage investment conduits ("REMICs") or one or
          more taxable mortgage pools in which the Corporation has acquired or
          plans to acquire an interest) or

          (b)  the endangerment of the tax status of one or more REMICs or one
          or more taxable mortgage pools in which the Corporation has acquired
          or plans to acquire an interest, the Board of Directors may require to
          be filed with the Corporation a statement or affidavit from any holder
          or proposed transferee of capital stock of the Corporation stating
          whether the holder or proposed transferee is

                    (i)  the United States, any state or political subdivision
             thereof, any possession of the United States, any foreign
             government, any international organization, or any agency or
             instrumentality of the foregoing, or any other organization that is
             exempt from federal income taxation (including taxation under the
             unrelated business taxable income provisions of the Code) (a
             "Disqualified Organization") or

                    (ii)  a partnership, trust, real estate investment trust,
             regulated investment company, or other pass-through entity in which
             a Disqualified Organization holds or is permitted to hold a direct
             or indirect beneficial interest (a "Pass-Through Entity").

                                       21
<PAGE>
 
          Any contract for the sale or other transfer of shares of capital
          stock of the Corporation shall be subject to this provision.
          Furthermore, the Board of Directors shall have the right, but shall
          not be required, to refuse to transfer any shares of capital stock of
          the Corporation purportedly transferred, if either

              (a)  a statement or affidavit requested pursuant to this Section 1
          has not been received, or

              (b)  the proposed transferee is a Disqualified Organization or
          Pass-Through Entity.

          Section 2.  Any acquisition of shares of capital stock of the
     Corporation that could or would

              (a)  result in the direct or indirect imposition of a penalty tax
          on the Corporation (including the imposition of an entity-level tax on
          one or more REMICs or one or more taxable mortgage pools in which the
          Corporation has acquired or plans to acquire an interest) or

              (b)  endanger the tax status of one or more REMICs or one or more
          taxable mortgage pools in which the Corporation has acquired or plans
          to acquire an interest shall be void ab initio to the fullest extent
          permitted under applicable law and the intended transferee of the
          subject shares shall be deemed never to have had an interest therein.

          If the foregoing provision is determined to be void or invalid by
     virtue of any legal decision, statute, rule or regulation, then the
     transferee of those shares shall be deemed, at the option of the
     Corporation, to have acted as agent on behalf of the Corporation in
     acquiring those shares and to hold those shares on behalf of the
     Corporation.

          Section 3.  Whenever it is deemed by the Board of Directors to be
     prudent in avoiding

              (a)  the direct or indirect imposition of a penalty tax on the
          Corporation (including the imposition of an entity-level tax on one or
          more REMICs or one or more taxable mortgage pools in which the
          Corporation has acquired or plans to acquire an interest) or

              (b)  the endangerment of the tax status of one or more REMICs or
          one or more taxable mortgage pools in which the Corporation has
          acquired or plans to acquire an interest, the Corporation may redeem
          shares of its capital stock.

          Any such redemption shall be conducted in accordance with the
     procedures set forth in Section 6 of Article VI.

          Section 4.  Nothing contained in this Article or in any other
     provision hereof shall limit the authority of the Board of Directors to
     take any and all other action as it in its sole discretion deems necessary
     or advisable to protect the Corporation or the interests of its
     stockholders by avoiding
 
              (a) the direct or indirect imposition of a penalty tax on the
          Corporation (including the imposition of an entity-level tax on one or
          more REMICs or one or more taxable mortgage pools in which the
          Corporation has acquired or plans to acquire an interest) or

              (b)  the endangerment of the tax status of one or more REMICs or
          one or more taxable mortgage pools in which the Corporation has
          acquired or plans to acquire an interest.

                                       22
<PAGE>
 
          Section 5.  If any provision of this Article or any application of any
     such provision is determined to be invalid by any federal or state court
     having jurisdiction over the issue, the validity of the remaining
     provisions shall be affected only to the extent necessary to comply with
     the determination of that court.

          2.  That thereafter, the Annual Meeting of the Stockholders of the
Corporation was duly called and held on May 17, 1994, upon notice in accordance
with Section 222 of the General Corporation Law of the State of Delaware at
which meeting the necessary number of shares as required by statute were voted
in favor of the amendments.

          3.  That said amendments were duly adopted in accordance with the
provisions of Section 242 of the General Corporation Law of the State of
Delaware.

          IN WITNESS WHEREOF, said Countrywide Mortgage Investments, Inc. has
caused this certificate to be signed by Sterling Blair Albernathy, its Senior
Vice President, and Richard H. Wohl, its Secretary, this 20th day of May, 1994.


                                              BY:  \s\ Sterling Blair Abernathy
                                                   ----------------------------
                                                   Sterling Blair Abernathy  
                                                   Senior Vice President
ATTEST:


\s\ Richard H. Wohl
- ----------------------          
Richard H. Wohl
Secretary

                                       23
<PAGE>
 
                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                          CWM MORTGAGE HOLDINGS, INC.
                                        

          CWM Mortgage Holdings, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware,
hereby certifies as follows:

          1.  That at a meeting of the Board of Directors of CWM Mortgage
Holdings, Inc. (the "Corporation") resolutions were duly adopted setting forth a
proposed amendment of the Certificate of Incorporation of said Corporation,
declaring said amendment to be advisable and calling for the proposal to be
presented to the shareholders of the Corporation at the Annual Meeting of the
Shareholders.  The resolution setting forth the proposed amendment is as
follows:

          RESOLVED, That the Certificate of Incorporation of the Corporation be
     amended by revising Article IV, Section 1 thereof so that, as amended,
     Article IV, Section 1 shall read in full as follows:

                                 "CAPITAL STOCK
                                  -------------

          Section 1.  The total number of shares of capital stock which the
     Corporation shall have authority to issue is One Hundred Million
     (100,000,000), consisting of One Hundred Million (100,000,000) shares of
     Common Stock having a par value of $0.01 per share."

          2.  That thereafter, the Annual Meeting of the Shareholders of the
Corporation was duly called and held on May 17, 1995, upon notice in accordance
with Section 222 of the General Corporation Law of the State of Delaware at
which meeting the necessary number of shares as required by statute were voted
in favor of the amendment.

          3.  That said amendment was duly adopted in accordance with the
provisions of Section 242 of the General Corporation Law of the State of
Delaware.

                                       24
<PAGE>
 
          IN WITNESS WHEREOF, the Corporation has caused this certificate to be
signed by Michael W. Perry, its Executive Vice President, and Richard H. Wohl,
its Secretary, this 18th day of May, 1995.


                              \s\ Michael W. Perry
                              --------------------
                              Michael W. Perry
                              Executive Vice President


ATTEST:


\s\ Richard H. Wohl
- -------------------
Richard H. Wohl
Secretary

                                       25
<PAGE>
 
                          CERTIFICATE OF AMENDMENT OF
                        CERTIFICATE OF INCORPORATION OF
                          CWM MORTGAGE HOLDINGS, INC.


          CWM Mortgage Holdings, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware (the
"Company"), hereby certifies as follows:

     1.  That at a meeting of the Board of Directors of the Company resolutions
were duly adopted setting forth a proposed amendment of the Certificate of
Incorporation of the Company, declaring said amendment to be advisable and
calling for the proposal to be presented to the shareholders of the Company at
the Annual Meeting of the Shareholders.  The resolution setting forth the
proposed amendment is as follows:

          NOW, THEREFORE, BE IT RESOLVED, That subject to the requisite approval
     of the shareholders of the Company at the Annual Meeting of Shareholders,
     Article I of the Company's Certificate of Incorporation be amended to read
     in full as follows:

                                   "ARTICLE I

                                      NAME
                                      ----

     The name of the Corporation is:  INMC Mortgage Holdings, Inc. (The
"CORPORATION")."

     2.  That thereafter, the Annual Meeting of the Shareholders of the Company
was duly called and held on June 24, 1997, upon notice in accordance with
Section 222 of the General Corporation Law of the State of Delaware, at which
meeting the necessary number of shares as required by statute were voted in
favor of the amendment.

     3.  That said amendment was duly adopted in accordance with the provisions
of Section 242 of the General Corporation Law of the State of Delaware.

          IN WITNESS WHEREOF, the Company has caused this certificate to be
signed by Michael W. Perry, its President, and Richard H. Wohl, its Secretary,
this 1st day of July, 1997.


                                 /s/ Michael W. Perry
                                 ------------------------
                                 Michael W. Perry
                                 President


ATTEST:


/s/ Richard H. Wohl
- -----------------------
Richard H. Wohl
Secretary

                                       26
<PAGE>
 
                          CERTIFICATE OF AMENDMENT OF
                        CERTIFICATE OF INCORPORATION OF
                          INMC MORTGAGE HOLDINGS, INC.


          INMC Mortgage Holdings, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware (the
"Company"), HEREBY CERTIFIES AS FOLLOWS:

     1.  That at a meeting of the Board of Directors of the Company resolutions
were duly adopted setting forth proposed amendments of the Certificate of
Incorporation of the Company, declaring said amendments to be advisable and
calling for the proposals to be presented to the Shareholders of the Company at
the Annual Meeting of the Shareholders.  The resolutions setting forth the
proposed amendments are as follows:

          NOW, THEREFORE, BE IT RESOLVED, That subject to the requisite approval
     of the Shareholders of the Company at the Annual Meeting of Shareholders,
     Article I of the Company's Certificate of Incorporation be amended to read
     in full as follows:

                                   "ARTICLE I

                                      NAME
                                      ----

     The name of the Corporation is:  IndyMac Mortgage Holdings, Inc. (the
"Corporation")."


          NOW THEREFORE, BE IT RESOLVED, That subject to the requisite approval
     of the shareholders of the Company at the Annual Meeting of Shareholders,
     Article IV, Section 1 of the Company's Certificate of Incorporation be
     amended to read in full as follows:

                                  "ARTICLE IV

                                 CAPITAL STOCK
                                 -------------

     Section 1.  The total number of shares of capital stock which INMC shall
     have authority to issue is Two Hundred Ten Million (210,000,000),
     consisting of (i) Two Hundred Million (200,000,000) shares of Common Stock
     having a par value of $0.01 per share and (ii) Ten Million (10,000,000)
     shares of Preferred Stock ("Preferred Stock") having a par value of $0.01
     per share.

          The Board of Directors is authorized, subject to limitations
     prescribed by law and the provisions of Article IV, to provide for the
     issuance of shares of Preferred Stock in series, and by filing a
     certificate pursuant to the applicable law of the State of Delaware, to
     establish from time to time the number of shares to be included in each
     such series, and to fix the designation, powers, preferences and rights of
     the shares of each such series and the qualifications, limitations or
     restrictions thereof.

          The authority of the Board of Directors with respect to each series of
     Preferred Stock shall include, but not be limited to, determination of the
     following:

          (a)  the number of shares constituting that series and the distinctive
               designation of that series;

          (b)  the dividend rate on the shares of that series, whether dividends
               shall be cumulative, and, if so, from which date or dates, and
               the relative rights of priority, if any, of payment of dividends
               on shares of that series;

          (c)  whether that series shall have voting rights, in addition to the
               voting rights provided by law, and, if so, the terms of such
               voting rights;

                                       27
<PAGE>
 
          (d)  whether that series shall have conversion privileges, and, if so,
               the terms and conditions of such conversion, including provision
               for adjustment of the conversion rate in such events as the Board
               of Directors shall determine;

          (e)  whether or not the shares of that series shall be redeemable,
               and, if so, the terms and conditions of such redemption,
               including the date or date upon or after which they shall be
               redeemable, and the amount per share payable in case of
               redemption, which amount may vary under different conditions and
               at different redemption dates;

          (f)  whether that series shall have a sinking fund for the redemption
               or purchase of shares of that series, and, if so, the terms and
               amount of such sinking fund;
 
          (g)  the rights of the shares of that series in the event of voluntary
               or involuntary liquidation, dissolution or winding up of the
               corporation, and the relative rights of priority, if any, of
               payment of shares of that series;

          (h)  any other relative rights, preferences and limitations of that
               series.

          Dividends on outstanding shares of Preferred Stock shall be paid or
     declared and set apart for payment before any dividends shall be paid or
     declared and set apart for payment on the common shares with respect to the
     same dividend period.

          If upon any voluntary or involuntary liquidation, dissolution or
     winding up of the corporation, the assets available for distribution to
     holders of shares of Preferred Stock of all series shall be insufficient to
     pay such holders the full preferential amount to which they are entitled,
     then such assets shall be distributed ratably among the shares of all
     series of Preferred Stock in accordance with the respective preferential
     amounts (including unpaid cumulative dividends, if any) payable with
     respect thereto."


     2.  That thereafter, the Annual Meeting of the Shareholders of the Company
was duly called and held on May 19, 1998, upon notice in accordance with Section
222 of the General Corporation Law of the State of Delaware, at which meeting
the necessary number of shares as required by statute were voted in favor of the
amendment.

     3.  That said amendment was duly adopted in accordance with the provisions
of Section 242 of the General Corporation Law of the State of Delaware.

                                       28
<PAGE>
 
     IN WITNESS WHEREOF, the Company has caused this certificate to be signed by
Michael W. Perry, its President, and Richard H. Wohl, its Secretary, this 19th
day Of May, 1998.


                                 /s/ Michael W. Perry
                                 ------------------------
                                 Michael W. Perry
                                 President


ATTEST:


/s/ Richard H. Wohl
- -----------------------
Richard H. Wohl
Secretary

                                       29

<PAGE>
 
                                                                       EXHIBIT 5
                                                                       ---------


                  [INDYMAC MORTGAGE HOLDINGS, INC. LETTERHEAD]

June 3, 1998


IndyMac Mortgage Holdings, Inc.
155 North Lake Avenue
Pasadena, California  91101

Ladies and Gentlemen:

     I have acted as counsel to IndyMac Mortgage Holdings, Inc., a Delaware
Corporation (the "Company") in connection with the preparation of a Registration
Statement on Form S-8 (the "Registration Statement") under the Securities Act of
1933, relating to the offer of up to 6,400,000 shares (the "Shares") of common
stock of the Company, par value $.01, to be issued under the terms and
conditions of awards granted under the Company's 1998 Stock Incentive Plan (the
"1998 Plan").

     This opinion is delivered in accordance with the requirements of Item
601(b)(5) of Regulation S-K under the Securities Act of 1933, as amended (the
"Securities Act").

     In connection with this opinion, I have examined and am familiar with
originals or copies, certified or otherwise identified to my satisfaction, of
(i) the Registration Statement, filed with the Securities and Exchange
Commission (the "Commission") under the Securities Act on June 3, 1998 (as such
Registration Statement may be subsequently amended and together with all
exhibits thereto, the "Registration Statement"), (ii) the 1998 Plan, (iii) the
Certificate of Incorporation of the Company as currently in effect, (iv) the By-
laws of the Company as currently in effect, (v) a specimen of the certificate to
be used to represent the Common Stock, and (vi) resolutions of the Board of
Directors of the Company relating to the issuance of the Shares and the filing
of the Registration Statement. I have also examined originals or copies,
certified or otherwise identified to my satisfaction, of such records of the
Company and such agreements, certificates of public officials, certificates of
officers or representatives of the Company and others, and such other documents,
certificates and records, as I have deemed necessary or appropriate as a basis
for the opinion set forth herein.

     In my examination, I have assumed the legal capacity of all natural
persons, the genuineness of all signatures, the authenticity of all documents
submitted to me as originals, the conformity to original documents of all
documents submitted to me as certified or photostatic copies and the
authenticity of the originals of such latter documents.  As to any facts
material to the opinion expressed herein, I have relied upon oral or written
statements and representations of officers and other representatives of the
Company and others.  I have also assumed that the Shares will be issued for
proper and sufficient consideration, in accordance with the terms of the 1998
Plan, and that the certificates representing such Shares will be properly
issued.
<PAGE>
 
     Based upon and subject to the foregoing, I am of the opinion that the
Shares, when issued and paid for in accordance with the 1998 Plan, will be
validly issued, fully paid and nonassessable.

     I hereby consent to the filing of this opinion with the Commission as
                                                                          
Exhibit 5 to the Registration Statement.  This opinion is furnished to you
- ---------                                                                 
solely in connection with the Registration Statement.


                                         Very truly yours,

                                         /s/ Richard H. Wohl

                                         Richard H. Wohl
                                         General Counsel


                                       2

<PAGE>
 
                                                            EXHIBIT 23(b)
                                                            -------------



              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
              ---------------------------------------------------
                                        

We have issued our reports dated February 27, 1998, accompanying the
consolidated financial statements and schedule of INMC Mortgage Holdings, Inc.
and Subsidiaries and the consolidated financial statements of IndyMac, Inc. and
Subsidiary included in the Annual Report of INMC Mortgage Holdings, Inc. on Form
10-K for the year ended December 31, 1997. We hereby consent to the
incorporation by reference of said reports in this Form S-8 Registration
Statement of IndyMac Mortgage Holdings, Inc. (formerly INMC Mortgage Holdings,
Inc.).



/s/ Grant Thornton LLP
Los Angeles, California
June 3, 1998


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