MUTUAL OF AMERICA INSTITUTIONAL FUNDS INC
485BPOS, 1999-06-04
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 4, 1999

                                                       REGISTRATION NO. 33-87874
================================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                ---------------
                                   FORM N-1A
          REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933            [X]

                        PRE-EFFECTIVE AMENDMENT NO.                          [ ]


                       POST-EFFECTIVE AMENDMENT NO. 7                        [X]


                                     AND/OR
      REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940        [X]


                                AMENDMENT NO. 12


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

                MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)

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

                                320 PARK AVENUE
                           NEW YORK, NEW YORK 10022
        (ADDRESS OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)(ZIP CODE)
                                 (212) 224-1939
             (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)

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

                        DOLORES J. MORRISSEY, PRESIDENT
                  MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.
                   320 PARK AVENUE, NEW YORK, NEW YORK 10022
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)

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

                                   COPY TO:

                             STANLEY M. LENKOWICZ
          SENIOR VICE PRESIDENT, DEPUTY GENERAL COUNSEL AND SECRETARY
                  MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.
                                320 PARK AVENUE
                            NEW YORK, NEW YORK 10022

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

 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: As soon as practicable after the
 effective date of the Registration Statement.


               IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE:
                   [X] immediately upon filing pursuant to paragraph (b).
                   [ ] on (date) pursuant to paragraph (b) of Rule 485.
                   [ ] 60 days after filing pursuant to paragraph (a)(1) of
                       Rule 485.
                   [ ] on (date) pursuant to paragraph (a)(1) of Rule 485.
                   [ ] 75 days after filing pursuant to paragraph (a)(2)
                   [ ] on (date) pursuant to paragraph (a)(2) of Rule 485


================================================================================

<PAGE>

                  MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.
                             CROSS-REFERENCE SHEET


<TABLE>
<CAPTION>
  ITEMS IN
 PART A OF
 FORM N-1A  CAPTION IN FORM N-1A                      CAPTION OR LOCATION IN PROSPECTUS
- ----------------------------------------------------------------------------------------------------------
     <S>    <C>                                       <C>
      1     Front and Back Cover Pages .............. Front and Back Covers
      2     Risk/Return Summary:
            Investments, Risks, and Performance ..... Summary of How Our Funds Invest
      3     Risk/Return Summary:
            Fee Table ............................... Summary of How Our Funds Invest - Annual Fees and
                                                      Expenses
      4     Investment Objectives, Principal
            Investment Strategies, and Related
            Risks ................................... Details about How Our Funds Invest and Related Risks
      5     Management's Discussion of Fund
            Performance ............................. Not Applicable (Included in Annual Report)
      6     Management, Organization, and
            Capital Structure ....................... Management of the Funds
      7     Shareholder Information ................. Information on Fund Shares
      8     Distribution Agreements ................. Not Applicable
      9     Financial Highlights Information ........ Financial Highlights
</TABLE>


<TABLE>
<CAPTION>
  ITEMS IN
 PART B OF                                             CAPTION OR LOCATION IN
 FORM N-1A  CAPTION IN FORM N-1A                       STATEMENT OF ADDITIONAL INFORMATION
- -------------------------------------------------------------------------------------------------------------
  <S>       <C>                                        <C>
  10        Cover Page and Table of Contents ......... Cover
  11        Fund History ............................. Investment Company's Form of Operations
  12        Description of the Fund and Its
            Investments and Risks .................... Investment Strategies and Related Risks; Fundamental
                                                       Investment Restrictions; Description of Corporate Bond
                                                       Ratings; Use of Standard & Poor's Indices
  13        Management of the Fund ................... Management of the Investment Company
  14        Control Persons and Principal Holders
            of Securities ............................ Investment Company's Form of Operations
  15        Investment Advisory and Other
            Services ................................. Investment Advisory Arrangements; Administrative
                                                       Arrangements; Independent
                                                       Auditors; Custodian
  16        Brokerage Allocation and Other
            Practices ................................ Portfolio Transactions and Brokerage
  17        Capital Stock and Other Securities ....... Investment Company's Form of Operations
  18        Purchase, Redemption, and Pricing of
            Shares ................................... Purchase, Redemption and Pricing of Shares
  19        Taxation of the Fund ..................... Taxation of the Investment Company
  20        Underwriters ............................. Distribution of Fund Services
  21        Calculation of Performance Data .......... Yield and Performance Information
  22        Financial Statements ..................... Financial Statements
</TABLE>

  ITEMS IN
 PART C OF  CAPTION IN FORM N-1A AND IN PART C
 FORM N-1A      OF REGISTRATION STATEMENT
- ----------------------------------------------
  23        Exhibits
  24        Persons Controlled by or Under
            Common Control with the Fund
  25        Indemnification
  26        Business and Other Connections of
            the Investment Adviser
  27        Principal Underwriters
  28        Location of Accounts and Records
  29        Management Services
  30        Undertakings

<PAGE>

                           PART C. OTHER INFORMATION


ITEM 23. EXHIBITS




<TABLE>
<S>            <C>

1(a)  Articles of Incorporation of Mutual of America  Institutional  Funds, Inc.
      (the "Fund"), dated October 26, 1995 (1)

1(b)  Articles Supplementary, dated February 20, 1996 (1)

1(c)  Articles Supplementary, dated April 8, 1996 (1)

1(d)  Articles Supplementary, dated December 2, 1996 (1)

1(e)  Articles Supplementary, dated February 24, 1997 (1)

1(f)  Articles Supplementary, dated April 6, 1999 (2)

2     By-Laws of the Fund (1)

4(a)  Form of  Investment  Advisory  Agreement,  as amended  effective May 1,
      1999,  between  the Fund  and  Mutual  of  America  Capital  Management
      Corporation (the "Adviser") (3)

4(b)  Form  of  Subadvisory   Agreement  between  the  Adviser  and  Fred  Alger
      Management, Inc. (5)

4(c)  Form of Subadvisory Agreement between the Adviser and Oak Associates (5)

4(d)  Form of  Subadvisory  Agreement  between the Adviser and  Palley-Needelman
      Asset Management, Inc. (5)

5     Distribution  Agreement between the Fund and Mutual of America  Securities
      Corporation, as Distributor (1)

7     Custody Agreement between the Fund and The Chase Manhattan Bank (6)

8(a)  Form of Transfer Agency and Service  Agreement  between the Fund and State
      Street Bank and Trust Company (6)

8(b)  Form of Investment  Accounting  Agreement between the Fund and the Adviser
      (4)

8(c)  Agreement to Pay Operating Expenses between the Fund and the Adviser (1)

9     Consent and Opinion of General Counsel (2)

10(a) Consent of Arthur Andersen LLP (2)

10(b) Consent of Swidler Berlin Shereff Friedman, LLP (2)

10(c) Powers of Attorney of Ms. Morrissey and Messrs. Altstadt, Kearney, Sharkey
      and Silber (5)

10(d) Power of Attorney of Patrick J. Waide, Jr. (4)

10(e) Powers of Attorney of John R. Greed and Stanley Shmishkiss (3)

27.1-3 Financial Data Schedules for All America, Bond and Money Market Funds (2)
</TABLE>
- --------------
(1)   Included in this Post-Effective Amendment No. 7
(2)   Included in  Post-Effective  Amendment No. 6 filed with the  Commission on
      April 15, 1999
(3)   Included in  Post-Effective  Amendment No. 5 filed with the  Commission on
      February 12, 1999
(4)   Included in  Post-Effective  Amendment No. 2 filed with the  Commission on
      February 28, 1997
(5)   Included in  Pre-Effective  Amendment  No. 4 filed with the  Commission on
      March 15, 1996
(6)   Included in  Pre-Effective  Amendment  No. 3 filed with the  Commission on
      January 29, 1996


                                      C-1
<PAGE>

ITEM 24. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

      The Adviser is an indirect  wholly-owned  subsidiary  of Mutual of America
Life Insurance Company (Mutual of America Life). Mutual of America Life is a New
York  mutual  life  insurance  company,  and as such no person has the direct of
indirect  power to control  Mutual of America Life except by virtue of a persons
capacity  as a  director  or  executive  officer.  Each  holder  of an  in-force
insurance  policy or annuity  contract  issued by Mutual of America Life has the
right to vote for the  election of directors of Mutual of America Life at annual
elections and upon other corporate matters where policyholders' votes are taken.
Mutual of America Life directly or indirectly owns the following companies:

Mutual of America Life Insurance  Company,  a New York mutual insurance company,
wholly owns

    o  Mutual of  America  Corporation,  a  Delaware  corporation,  and
    o  Mutual of America Foundation, a New York not-for-profit corporation.

Mutual of America Corporation wholly owns

    o  The American  Life  Insurance  Company  of New  York,  a New  York  stock
       corporation,
    o  Mutual of America  Securities Corporation, a  Delaware  corporation,  and
    o  Mutual  of  America  Capital  Management  Corporation  (the  Adviser),  a
       Delaware corporation.

Mutual of America Life Insurance Company and The American Life Insurance Company
of New York,  through their separate  accounts,  wholly own all of the shares of
Mutual of America  Investment  Corporation,  a Maryland  corporation  registered
under the 1940 Act as a management  investment  company whose shares are offered
only to those separate accounts for funding variable life insurance and variable
annuity products.

Mutual  of  America  Life  Insurance   Company  currently  owns  a  majority  of
Registrant's outstanding shares.

ITEM 25. INDEMNIFICATION

     ARTICLES OF INCORPORATION OF THE FUND. The Articles of Incorporation of
the Fund provide in substance that no director or officer of the Fund shall be
liable to the Fund or its shareholders for money damages, unless the director
or officer is subject to liability by reason of willful misfeasance, bad faith,
gross negligence or reckless disregard of duties in the conduct of his or her
office.


     BY-LAWS OF THE FUND. The By-Laws of the Fund provide for the
indemnification of present and former officers and directors of the Fund
against liability by reason of service to the Fund, unless the officer or
director is subject to liability by reason of willful misfeasance, bad faith,
gross negligence or reckless disregard of the duties involved in the conduct of
his or her office (Disabling Conduct). No indemnification shall be made to an
officer or director unless there has been a final adjudication on the merits, a
dismissal of a proceeding for insufficiency of evidence of Disabling Conduct,
or a reasonable determination has been made that no Disabling Conduct occurred.
The Fund may advance payment of expenses only if the officer or director to be
indemnified undertakes to repay the advance unless indemnification is made and
if one of the following applies: the officer of director provides a security
for his or her undertaking, the Fund is insured against losses from any lawful
advances, or a reasonable determination has been made that there is reason to
believe the officer or director ultimately will be entitled to indemnification.


     INSURANCE. Coverage for officers and director of the Adviser, Distributor
and the Fund is provided under an Investment Management insurance policy issued
by American International Specialty Lines Insurance Company, with excess
coverage by Chubb custom Insurance Company, to Mutual of America Life Insurance
Company et al. The aggregate limit of liability under the policy per year is
$10 million, with a $200,000 deductible per entity insured and a $1,000
deductible for individual insureds.


                                      C-2
<PAGE>

     BY-LAWS OF THE ADVISER. The By-Laws of Mutual of America Capital
Management Corporation, the Fund's Adviser, provide for the indemnification by
the Corporation of present and former directors and officers of the Corporation
and of any organization for which service is rendered at the request of the
Corporation and permits the advance payment of expenses in certain
circumstances for covered persons in connection with suits by third parties and
derivative suits. Each covered person must have acted in good faith and in a
manner the person reasonably believed to be in or not opposed to the best
interests of the Corporation and, with respect to any criminal action or
proceeding, had no reasonable cause to believe the conduct was unlawful. If in
connection with a derivative suit a covered person shall have been adjudged to
be liable to the Corporation, indemnification shall not be made unless and only
to the extent that the Delaware Court of Chancery or the court in which such
action or suit was brought shall determine upon application that, despite the
adjudication of liability but in view of all the circumstances of the case,
such person is entitled to indemnity. Thus, the officers and directors of the
fund and the Adviser are indemnified by the Adviser for their services in
connection with the Fund to the extent set forth in the By-Laws.

     BY-LAWS OF THE DISTRIBUTOR. The By-laws of Mutual of America Securities
Corporation, the principal underwriter and distributor for the fund, provide
for the indemnification by the Corporation of present and former directors and
officers of the Corporation and of any organization for which service is
rendered at the request of the Corporation and permits the advance payment of
expenses in certain circumstances for covered persons in connection with suits
by third parties and derivative suits. Each covered person must have acted in
good faith and in a manner the person reasonably believed to be in or not
opposed to the best interests of the Corporation and, with respect to any
criminal action or proceeding, had no reasonable cause to believe the conduct
was unlawful. If in connection with a derivative suit a covered person shall
have been adjudged to be liable to the Corporation, indemnification shall not
be made unless and only to the extent that the Delaware Court of Chancery or
the court in which such action or suit was brought shall determine upon
application that, despite the adjudication of liability but in view of all the
circumstances of the case, such person is entitled to indemnity. Thus, the
officers and directors of the Distributor are indemnified by the Distributor
for their services in connection with the Fund to the extent set forth in the
By-Laws.

     UNDERTAKING. Insofar as indemnification for liability 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 its it against public policy as expressed in the Act
and will be governed by the final adjudication of such issue.


                                      C-3
<PAGE>

ITEM 26. BUSINESS AND OTHER CONNECTIONS OF THE INVESTMENT ADVISER

     Mutual of America Capital Management corporation (the Adviser) is the
investment adviser to the Fund and is registered as an investment adviser under
the Investment Advisers Act of 1940. The names, addresses and positions with
the Adviser of each director and officer of the Adviser are set forth below.

<TABLE>
<CAPTION>
                                 POSITIONS                              PRINCIPAL OCCUPATION
NAME                             WITH ADVISER                          DURING PAST TWO YEARS
- ----                             ------------                          ---------------------
<S>                              <C>                       <C>
Thomas J. Moran ................ Director, Chairman of     President, Chief Executive Officer and
320 Park Avenue                  the Board                 Director, Mutual of America Life
NY, NY 10022

F. Harlan Batrus ............... Director                  Partner, Lazard Freres
30 Rockefeller Plaza
NY, NY 10020

Roger E. Birk .................. Director                  Chairman Emeritus, Merrill Lynch & Co. Inc.
Merrill Lynch
77 Broad Street
Red Bank, NJ 07701

Robert X. Chandler ............. Director                  Director, Development Office, Archdiocese of
Director, Development Office                               Boston
Archdiocese of Boston
2121 Commonwealth Ave.
Brighton, MA 02135

Nathaniel A. Davis ............. Director                  Vice President, Network Engineering
17680 Old Meadow Rd.                                       Operations, Nextel Communications
McLean, VA 22102

Anthony F. Earley .............. Director                  Chairman, President and Chief Operating
Detroit Edison Company                                     Officer, Detroit Edison Co.
2000 Second Avenue
Room 2407 WCB
Detroit, MI 48226

William T. Knowles ............. Director                  Consultant
Orr's Island, ME 04066

Walter A. McDougal ............. Director                  Former Chairman and President, Richmond
Garden City, NY 11530                                      Hill Savings Bank

James E. Quinn ................. Director                  Vice Chairman, Tiffany & Co.
727 Fifth Avenue
NY, NY 10022

Richard J. Ciecka .............. President and Chief       Vice Chairman of the Board, Mutual of
320 Park Avenue                  Financial Officer;        America Life, until October 1998
NY, NY 10022                     Director

Manfred Altstadt ............... Senior Executive Vice     Senior Executive Vice President and Chief
320 Park Avenue                  President and Chief       Financial Officer of Mutual of America Life
NY, NY 10022                     Financial Officer         and American Life

Patrick A. Burns ............... Senior Executive Vice     Senior Executive Vice President and General
320 Park Avenue                  President and             Counsel of Mutual of America Life and
NY, NY 10022                     General Counsel           American Life

Amir Lear ...................... Executive Vice            Senior Vice President, Mutual of America
320 Park Avenue                  President and             Life, until October 1998
NY, NY 10022                     Assistant to the
                                 President and CEO

Andrew L. Heiskell ............. Executive Vice            Executive Vice President of the Adviser
320 Park Avenue                  President
NY, NY 10022

Joseph Brunken ................. Senior President          Senior Vice President of the Adviser since
320 Park Avenue                                            November, 1997; prior thereto, Vice
NY, NY 10022                                               President, Nikko Capital Management
                                                           (USA), Inc.
</TABLE>


                                      C-4
<PAGE>

<TABLE>
<CAPTION>
                              POSITIONS                               PRINCIPAL OCCUPATION
NAME                          WITH ADVISER                            DURING PAST TWO YEARS
- ----                          ------------                            ---------------------
<S>                           <C>                        <C>

Mary E. Canning ................ Senior Vice President     Senior Vice President of the Adviser since May
320 Park Avenue                                            1999; prior thereto, Managing
NY, NY  10022                                              Director/Portfolio Manager at Phoenix Duff &
                                                           Phelps

Susan J. Ferber ................ Senior Vice President     Senior Vice President of the Adviser since May
320 Park Avenue                                            1999; prior thereto, Vice President of Business
NY, NY  10022                                              Development, Argus Investors' Counsel


Jon J. LaBerge ................. Senior Vice President     Senior Vice President of the Adviser
320 Park Avenue
NY, NY 10022

Thomas Larsen ............... Executive Vice             Executive Vice President of the Adviser since
320 Park Avenue               President                  June 1998; prior thereto, Senior
NY, NY 10022                                             Vice President, Desai Capital Management

Stanley M. Lenkowicz ........ Senior Vice President,     Senior Vice President and Deputy General
320 Park Avenue               Deputy General             Counsel, Mutual of America Life
NY, NY 10022                  Counsel & Secretary

Nancy McAvey ................ Senior Vice President      Senior Vice President of the Adviser
320 Park Avenue
NY, NY 10022


John P. Middleton ........... Senior Vice President      Senior Vice President of the Adviser since
320 Park Avenue                                          May 1999; prior thereto, Vice President,
NY, NY  10022                                            Raymond James & Associates


Paul Travers ................ Senior Vice President      Senior Vice President of the Adviser
320 Park Avenue
NY, NY 10022

Gary P. Wetterau ............ Senior Vice President      Vice President of the Adviser
320 Park Avenue
NY, NY 10022

David Wood .................. Senior Vice President      Senior Vice President of the Adviser
320 Park Avenue
NY, NY 10022

Aline Couture ............... Vice President             Vice President of the Adviser
320 Park Avenue
NY, NY 10022

Doris Klug .................. Vice President             Vice President of the Adviser
320 Park Avenue
NY, NY 10022

Jonathan Lee ................ Vice President             Vice President of the Adviser
320 Park Avenue
NY, NY 10022

Robert H. Stewart ........... Vice President             Vice President of the Adviser
320 Park Avenue
NY, NY 10022
</TABLE>


     Each of Palley-Needelman Asset Management, Inc. ("Palley-Needelman"), Oak
Associates, Ltd. ("Oak Associates") and Fred Alger Management, Inc. ("Alger
Management") is a subadviser for a portion of the Active Assets of the All
America Fund allocated to it. Each subadviser is registered as an investment
adviser under the Investment Advisers Act of 1940. The names, addresses and
positions of each director and officer of each subadviser are incorporated by
reference to the Form ADV of the subadviser filed with the Securities and
Exchange Commission, as set forth below.

     Palley-Needelman Asset Management, Inc., Form ADV, SEC File No. 801-9755.

     Oak Associates, Ltd., Form ADV, SEC File No. 801-23632.

     Fred Alger Management, Inc., Form ADV, SEC File No. 801-06709.


                                      C-5
<PAGE>

ITEM 27. PRINCIPAL UNDERWRITERS

     (a) Mutual of America Securities Corporation (the "Distributor"), a
Delaware corporation, is the principal underwriter and distributor for Fund
shares.

     (b) The names of the officers and directors of the Distributor, and their
positions with the Distributor and the Fund, are as follows:

<TABLE>
<CAPTION>
                                          POSITION WITH
NAME                                       DISTRIBUTOR                  POSITION WITH THE FUND
- - ------------------------------ ---------------------------------- ---------------------------------
<S>                            <C>                                <C>
Thomas J. Moran .............. Chairman of the Board                             --
                               and Director
Dolores J. Morrissey ......... President and CEO                  President and Director
Amir Lear .................... Senior Vice President and CFO                     --
Manfred Altstadt ............. Senior Executive Vice              Senior Executive Vice President,
                               President, Treasurer and           Treasurer and Director
                               Director
Patrick A. Burns ............. Senior Executive Vice              Senior Executive Vice President,
                               President, General Counsel and     General Counsel and Director
                               Director
Salvatore R. Curiale ......... Senior Executive Vice                             --
                               President and Director
Stanley M. Lenkowicz ......... Senior Vice President, Secretary   Senior Vice President, Deputy
                               and Director                       General Counsel and Secretary
Howard Lichtenstein .......... Director                                          --
William S. Conway ............ Executive Vice President/                         --
                               Marketing
Paul J. Costagliola .......... Vice President and                                --
                               Compliance Officer
</TABLE>

     (c) Not applicable.


ITEM 28. LOCATION OF ACCOUNTS AND RECORDS

     The records required to be maintained by Section 31(a) of the Investment
Company Act of 1940 and Rules 31a-3 promulgated thereunder, will be maintained
by the Adviser at its offices at 320 Park Avenue, New York, New York 10022 or
with its custodian.


ITEM 29. MANAGEMENT SERVICES

     Not applicable.


ITEM 30. UNDERTAKINGS

     The Fund hereby undertakes, if requested to do so by the holders of at
least 10% of the Fund's outstanding shares, to call a meeting of shareholders
for the purpose of voting upon the question of removal of a director or
directors and to assist in communications with other shareholders as required
by applicable law and regulations.


                                      C-6
<PAGE>

                                   SIGNATURES


Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company Act of 1940, the registrant certifies that it meets all the requirements
for effectiveness of this post-effective amendment to Registration Statement
pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused
this post-effective amendment to Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of New York,
and State of New York on the 4th day of June, 1999.


                                     MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.
                                                    (Registrant)


                                     By: /s/    DOLORES J. MORRISSEY
                                        -------------------------------------
                                                  TITLE: PRESIDENT


     Pursuant to the requirement of the Securities Act of 1933, this post-
effective amendment to Registration Statement has been signed below by the
following persons in the capacities indicated on June 4, 1999.




<TABLE>
<CAPTION>
                   SIGNATURES                                              TITLE
                   ----------                                              -----
<S>                                                <C>
/s/         DOLORES J. MORRISSEY                   President and Director
- ---------------------------------------             (Principal Executive Officer)
           (DOLORES J. MORRISSEY)

                    *                              Director
- ---------------------------------------
             KEVIN M. KEARNEY

                    *                              Director
- ---------------------------------------
             JOHN T. SHARKEY

                    *                              Director
- ---------------------------------------
             JOHN R. SILBER

                    *                              Director
- ---------------------------------------
           STANLEY SHMISHKISS

                    *                              Director
- ---------------------------------------
          PATRICK J. WAIDE, JR.


                    *                             Executive Vice President and Chief Financial Officer
- ---------------------------------------          (Principal Financial and Accounting Officer)
             JOHN R. GREED


*By /s/  DOLORES J. MORRISSEY
   ----------------------------------
 (DOLORES J. MORRISSEY, ATTORNEY-IN-FACT)
</TABLE>


                                      C-7
<PAGE>

                                 EXHIBIT INDEX


   EXHIBIT
   NUMBER                                                                   PAGE
   -------                                                                  ----
1(a)     Articles of Incorporation of Mutual of America Institutional Funds,
         Inc. (the "Fund"), dated October 26, 1995

1(b)     Articles Supplementary, dated February 20, 1996

1(c)     Articles Supplementary, dated April 8, 1996

1(d)     Articles Supplementary, dated December 2, 1996

1(e)     Articles Supplementary, dated February 24, 1997

2        By-Laws of the Fund

5        Distribution Agreement between the Fund and Mutual of America
         Securities Corporation, as Distributor

8(c)     Agreement to Pay Operating Expenses between the Fund and the Adviser



                            ARTICLES OF INCORPORATION
                                       OF
                   MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.

                            ARTICLE I - Incorporator

      I, the  incorporator,  Stanley M. Lenkowicz,  whose post office address is
666 Fifth Avenue,  4th Floor, New York, New York 10103,  being at least eighteen
years of age,  am,  under  and by  virtue  of the  general  laws of the State of
Maryland authorizing the formation of corporations, forming a corporation.

                                ARTICLE II - Name

      The name of the corporation (hereinafter called the Corporation) is Mutual
of America Institutional Funds, Inc.

                             ARTICLE III - Purposes

      The purpose for which the  Corporation  is formed is to act as an open-end
management  investment  company,  registered  as such  with the  Securities  and
Exchange  Commission  pursuant to the Investment  Company Act of 1940 as amended
(the 1940 Act), and for any other lawful purposes.

                        ARTICLE IV - Address in Maryland

      The post office address of the principal  office of the Corporation in the
State of Maryland is c/o CT  Corporation  System,  32 South  Street,  Baltimore,
Maryland 21202. The name of the Corporation's  resident agent is The Corporation
Trust Incorporated,  and its post office address is 32 South Street,  Baltimore,
Maryland 21202. Said resident agent is a corporation of the State of Maryland.

                            ARTICLE V - Common Stock

                                   Section 1.

      (a) The  Corporation  has  authority to issue one billion  (1,000,000,000)
shares of common  stock (the  Shares)  of the par value of $.01 each,  having an
aggregate par value of  $10,000,000,  in any class or classes,  each  comprising
such  number of Shares and  having  such  preferences,  rights,  voting  powers,
restrictions,   limitations  as  to  dividends,   qualifications  and  terms  of
redemption as shall be determined by resolution of the Board of Directors of the
Corporation.


                                      -1-
<PAGE>

      The Board of Directors  shall have the power and authority,  by resolution
adopted by such Board and by causing  articles  supplementary,  if  required  by
Section  2-208 or Section  2-208.1  or the  successor  thereto  of the  Maryland
General  Corporation  Law, to be filed with the State  Department of Assessments
and Taxation of Maryland (the Department) to:

            (i)  establish  and  designate  one or more  classes  of Shares  and
      authorize   the   issuance  of  Shares  of  each  such  class,   including
      determination  of the  preferences,  conversion  or other  rights,  voting
      powers,  restrictions,  limitations  as to dividends,  qualifications,  or
      terms or conditions of redemption of the Shares;

            (ii)  at any  time  when  there  are  no  Shares  outstanding  for a
      particular  class  previously  established  and designated by the Board of
      Directors, eliminate such class;

            (iii)  increase or decrease  the  aggregate  number of Shares or the
      number of Shares of any class that the Corporation has authority to issue;

            (iv) classify or reclassify any unissued Shares from time to time by
      setting or changing the  preferences,  conversion or other rights,  voting
      powers,  restrictions,  limitations  as to dividends,  qualifications,  or
      terms or conditions of redemption of such unissued Shares.

      (b) A  description  of the  relative  preferences,  conversion  and  other
rights, voting powers, restrictions, limitations as to dividends, qualifications
and terms and  conditions  of redemption of all classes of Shares is as follows,
unless  otherwise  set  forth  in the  articles  supplementary  filed  with  the
Department  describing any further class or classes from time to time created by
the Board of Directors:

            (i) Assets  Belonging to Class.  All  consideration  received by the
      Corporation  for the  issue  or  sale of  Shares  of a  particular  class,
      together  with all  assets in which  such  consideration  is  invested  or
      reinvested,  all income, earnings, profits and proceeds thereof, including
      any  proceeds  derived  from the sale,  exchange  or  liquidation  of such
      assets,  and any funds or payments  derived from any  reinvestment of such
      proceeds in whatever  form the same may be,  shall  irrevocably  belong to
      that class for all purposes,  subject only to the rights of creditors, and
      shall be so recorded  upon the books of account of the  Corporation.  Such
      consideration,  assets, income, earnings, profits and proceeds,  including
      any  proceeds  derived  from the sale,  exchange  or  liquidation  of such
      assets,  and any funds or payments  derived from any  reinvestment of such
      proceeds, in whatever form the same may be together with any General Items
      (as  hereinafter  defined)  allocated  to that  class as  provided  in the
      following  sentence,  are herein  referred to as assets  belonging to that
      class.  In the event there are any assets,  income,  earnings,  profits or
      proceeds thereof,  funds or payments which


                                      -2-
<PAGE>

      are  not  readily  identifiable  as  belonging  to  any  particular  class
      (collectively  General Items),  the Board of Directors shall allocate such
      General  Items to and among any one or more of the  classes  created  from
      time to time,  in such manner and on such basis as the Board of  Directors
      in its sole discretion deems fair and equitable;  and any General Items so
      allocated  to a  particular  class shall  belong to that class.  Each such
      allocation by the Board of Directors  shall be conclusive and binding upon
      the stockholders of all classes for all purposes.

            (ii)  Liabilities  Belonging to Class.  The assets belonging to each
      particular  class shall be charged with the liabilities of the Corporation
      in  respect  of that  class  and with all  expenses,  costs,  charges  and
      reserves  attributable  to that class,  and shall be so recorded  upon the
      books of account of the Corporation.  Such liabilities,  expenses,  costs,
      charges and  reserves,  together  with any General  Items of Liability (as
      hereinafter  defined) allocated to that class as provided in the following
      sentence,  so charged to that class are herein  referred to as liabilities
      belonging to that class.  In the event there are any general  liabilities,
      expenses,  costs,  charges or  reserves of the  Corporation  which are not
      readily  identifiable as belonging to any particular  class  (collectively
      General Items of  Liability),  the Board of Directors  shall  allocate and
      charge  General  Items of  Liability  to and  among any one or more of the
      classes created from time to time, in such manner and on such basis as the
      Board of Directors in its sole  discretion  deems fair and equitable;  and
      any General  Items of Liability  so allocated  and charged to a particular
      class shall  belong to that class.  Each such  allocation  by the Board of
      Directors  shall be conclusive  and binding upon the  stockholders  of all
      classes for all purposes.

            (iii) Dividends.  Dividends and distributions with respect to Shares
      of a  particular  class may be paid to the holders of Shares of that class
      at such  times,  in such  manner and from such of the  income and  capital
      gains accrued or realized from the assets  belonging to that class,  after
      providing for actual and accrued  liabilities  belonging to that class, as
      the Board of Directors may determine.

            (iv) Liquidation.  In the event of the liquidation or dissolution of
      the Corporation or of one or more classes,  the stockholders of each class
      that is being  liquidated shall be entitled to receive,  as a class,  when
      and as  declared  by the Board of  Directors,  the  excess  of the  assets
      belonging to that class over the liabilities  belonging to that class. The
      assets so  distributable to the stockholders of any particular class shall
      be  distributed  among such  stockholders  in  proportion to the number of
      Shares  of that  class  held by them  and  recorded  on the  books  of the
      Corporation.

            (v) Equality.  Each Share of any particular class shall represent an
      equal and  proportionate  interest in the assets  belonging  to that class
      (subject  to the


                                      -3-
<PAGE>

      liabilities  belonging to that class);  however,  the  provisions  of this
      sentence  shall not  restrict  any  distinctions  permissible  pursuant to
      subsection (iii) of this Section 1(b) or otherwise under these Articles of
      Incorporation  that may exist with  respect to  stockholder  elections  to
      receive  dividends or distributions in cash or Shares of the same class or
      that may otherwise exist with respect to dividends and distributions  with
      respect to Shares if the same class.

            (vi) Conversion or Exchange  Rights.  Subject to compliance with the
      requirements of the 1940 Act, and unless the Board of Directors shall have
      provided  otherwise  by  resolution,  holders of Shares of any class shall
      have the right to convert to other  classes of Shares in  accordance  with
      such  requirements  and  procedures as may be  established by the Board of
      Directors.

            (vii) Fractional  Shares.  The Corporation may issue,  sell, redeem,
      repurchase and otherwise deal in and with its Shares in fractional Shares,
      and any such fractional Shares shall carry  proportionately all the rights
      of a whole Share,  excepting any right to receive a certificate evidencing
      such fractional Shares, but including,  without  limitation,  the right to
      vote, the right to receive dividends and  distributions,  and the right to
      participate upon liquidation of the Corporation or any class.

                                   Section 2.

      Each Share also shall be subject to the following provisions:

      (a) The net  asset  value  per Share of a  particular  class  shall be the
quotient  obtained by dividing  the value of the net assets of that class (being
the value of the total  assets  belonging  to that  class  less the  liabilities
belonging  to  that  class)  by  the  total  number  of  Shares  of  that  class
outstanding. Subject to subsection (b) of this Section 2, the value of the total
assets  belonging to each class shall be determined by,  determined  pursuant to
the  direction  of, or  determined  pursuant  to  procedures  or methods  (which
procedures or methods may differ from class to class) prescribed or approved by,
the Board of Directors in its sole discretion, and shall be so determined at the
time or times (which time or times may differ from class to class) prescribed or
approved by the Board of Directors in its sole discretion.

      (b) The net  asset  value of each  Share of a  particular  class  shall be
determined  in  accordance  with any  applicable  provision of the 1940 Act, any
applicable rule,  regulation or order of the Securities and Exchange  Commission
thereunder,  and any  applicable  rule or  regulation  made  or  adopted  by any
securities association registered under the Securities Exchange Act of 1934.

      (c) All Shares now or hereafter  authorized shall be subject to redemption
and  redeemable  at the  option of the  stockholder,  in the  sense  used in the
General Laws of the State of Maryland authorizing the formation of corporations.
Each holder of a Share of any class,


                                      -4-
<PAGE>

upon request to the  Corporation  accompanied  by  surrender of the  appropriate
stock certificate or certificates (if any) in proper form for transfer, shall be
entitled to require the  Corporation  to redeem all or any part of the Shares of
that class  standing in the name of such holder on the books of the  Corporation
at the net asset value per Share of that class  determined  in  accordance  with
subsection (a) of this Section 2 less any applicable  contingent  deferred sales
charge.

      (d)  Notwithstanding  subsection  (c) of this  Section  2,  the  Board  of
Directors of the  Corporation  may suspend the right of the holders of Shares of
any or all  classes to require  the  Corporation  to redeem  such  Shares or may
suspend any voluntary purchase of such Shares:

            (i) for any period (A) during  which the New York Stock  Exchange is
      closed other than customary  weekend and holiday  closings,  or (B) during
      which trading on the New York Stock Exchange is restricted;

            (ii) for any period  during  which an  emergency,  as defined by the
      rules of the Securities and Exchange  Commission or any successor thereto,
      exists as a result of which (A) disposal by the  Corporation of securities
      owned  by it and  belonging  to  the  affected  class  or  classes  is not
      reasonably  practicable,  or (B) it is not reasonably  practicable for the
      Corporation  fairly  to  determine  the  value  of the net  assets  of the
      affected class or classes; or

            (iii) for such period as the Securities  and Exchange  Commission or
      any  successor  thereto  may by order  permit  for the  protection  of the
      stockholders of the Corporation.

      (e) The Board of Directors may by resolution  from time to time  authorize
the purchase by the Corporation,  either directly or through an agent, of Shares
of any class upon such terms and  conditions and for such  consideration  as the
Board of Directors shall deem advisable out of funds legally available  therefor
at prices  per  Share  not in  excess of their net asset  value per Share of the
class determined in accordance with subsection (a) of this Section 2 and to take
all other steps deemed necessary or advisable in connection therewith.

      (f) The Corporation may in its discretion redeem, at the current net asset
value,  outstanding  shares not  offered  for  redemption  which are held by any
stockholder  whose Shares of a particular  class, in the aggregate,  have a then
total net asset value of less than $5,000 or such other amount as the  Directors
shall  determine by resolution and subject to any  limitations of applicable law
(the "Minimum Amount"),  provided that prior to any such proposed redemption the
Corporation  shall have  given such  stockholder  written  notice  that the then
current aggregate net asset value of the  stockholder's  shares is less than the
Minimum  Amount and allowed the  stockholder to make  additional  investments in
order  to  increase  the  then  current   aggregate   net  asset  value  of  the
stockholder's shares to at least the Minimum Amount.

      (g)  Except  as  otherwise  permitted  by the  1940  Act,  payment  of the
redemption  price of Shares  of any class  surrendered  to the  Corporation  for
redemption pursuant to the provisions of subsection (c) or (f) of this Section 2
or for purchase by the Corporation  pursuant to the provisions of


                                      -5-
<PAGE>

subsection (e) of this Section 2 shall be made by the  Corporation  within seven
days after  surrender of such Shares to the  Corporation  for such purpose.  Any
such payment may be made in whole or in part in portfolio  securities or in cash
belonging to such class, as the Board of Directors shall deem advisable,  and no
stockholder  shall have the  right,  other  than as  determined  by the Board of
Directors, to have any Shares redeemed in portfolio securities.

      (h) In the  absence of any  specifications  as to the  purposes  for which
Shares are redeemed or repurchased by the Corporation, all Shares so redeemed or
repurchased  shall  be  deemed  to be  acquired  for  retirement  in  the  sense
contemplated  by the laws of the State of Maryland.  Shares of any class retired
by repurchase or redemption  shall  thereafter have the status of authorized but
unissued Shares of that class.

      (i) The Board of Directors or the By-Laws of the Corporation may authorize
the issue of Shares of one or more classes without certificates.

                                   Section 3.

      No  holder  of  Shares  of any  class  shall,  as such  holder,  have  any
preemptive  right to purchase or  subscribe  for any Shares of that or any other
class  which the  Corporation  may issue or sell  (whether  out of the number of
Shares  authorized  by the  Articles  of  Incorporation,  or  out of any  Shares
acquired by the Corporation after the issue thereof, or otherwise).

                                   Section 4.

      All persons who shall acquire Shares in the Corporation  shall acquire the
same subject to the provisions of these Articles of Incorporation.

                             ARTICLE VI - Directors

      (a) The initial number of directors of the Corporation shall be three, and
the names of those who shall act as such until their successors are duly elected
and qualify are as follows:

                              Dolores J. Morrissey
                              Manfred Altstadt
                              Patrick A. Burns

      (b) The By-Laws of the  Corporation may fix the number of directors at not
less than  three and not more than ten and may  specify  the tenure of office of
the directors.  The By-Laws of the  Corporation  may divide the directors of the
Corporation  into  classes  and  prescribe  the tenure of office of the  several
classes,  in which case no class shall be elected for a shorter  period than one
year or for a longer period than five years,  and the term of office of at least
one class shall expire each year.


                                      -6-
<PAGE>

      (c) The Board of Directors  shall have the  management  and control of the
property,  business and affairs of the Corporation and is hereby vested with all
the powers  possessed by the  Corporation to the extent  consistent with law and
these Articles of  Incorporation.  Without  limitation of the  foregoing,  it is
expressly declared that,  subject to these Articles of Incorporation,  the Board
of Directors shall have power:

            (i) to make, alter, amend or repeal from time to time the By-Laws of
      the  Corporation,  except as such  power may  otherwise  be limited in the
      By-Laws;

            (ii) to authorize  the purchase of Shares of any class at prices not
      in excess of their net asset value for Shares of that class  determined in
      accordance with subsection (a) of Section 2 of Article V hereof,  provided
      that the Corporation has assets legally available for such purpose, and to
      pay for such Shares in cash, securities or other assets then held or owned
      by the Corporation;

            (iii) To declare  and pay  dividends  and  distributions  from funds
      legally  available  therefor on Shares of such class or  classes,  in such
      amounts,  if any, and in such manner (including  declaration by means of a
      formula or other similar method of determination whether or not the amount
      of the dividend or  distribution so declared can be calculated at the time
      of such declaration) and to the stockholders of record as of such date, as
      the Board of Directors may determine.

      (d) The directors of the  Corporation may receive  compensation  for their
services,  subject,  however,  to such limitation with respect thereto as may be
determined from time to time by the stockholders.

                ARTICLE VII - Liability of Officers and Directors

      (a) To the fullest extent permitted by Maryland and federal  statutory and
decisional  law,  as  amended or  interpreted,  no  director  or officer of this
Corporation  shall be personally  liable to the Corporation or its  stockholders
for money  damages;  provided  however,  that nothing  herein shall be deemed to
protect any director or officer of the Corporation  against any liability to the
Corporation  or its  stockholders  to  which  such  director  or  officer  would
otherwise  be  subject  by reason  of  willful  misfeasance,  bad  faith,  gross
negligence or reckless disregard of the duties involved in the conduct of his or
her office.

      (b) Any determination made in good faith and, so far as accounting matters
are involved,  in accordance with generally accepted accounting principles by or
pursuant  to the  direction  of the  Board of  Directors,  shall  be  final  and
conclusive, and shall be binding upon the Corporation and all holders of Shares,
past,  present and future,  of each class, and Shares are issued and sold on the
condition and  undertaking,  evidenced by acceptance  of  certificates  for such
Shares by, or  confirmation  of such  Shares  being held for the account of, any
stockholder, that any and all such determinations shall be binding.


                                      -7-
<PAGE>

               ARTICLE VIII - Voting and Other Shareholder Rights

      (a) On each matter submitted to a vote of the stockholders, each holder of
a Share shall be entitled to one vote for each full Share and a fractional  vote
for each fractional share,  irrespective of the class, standing in such holder's
name on the books of the  Corporation  irrespective of the class thereof and all
Shares of all  classes  shall  vote as a single  class  (Single  class  Voting);
provided,  however,  that (i) as to any matter with  respect to which a separate
vote of any  class  is  required  by the  1940  Act or  under  Maryland  General
Corporation  Law,  such  requirements  as to a separate vote by that class shall
apply in lieu of Single class Voting as described above;  (ii) in the event that
the separate  vote  requirements  referred to in (i) above apply with respect to
one or more  classes,  then,  subject  to (iii)  below,  the Shares of all other
classes shall vote as a single class;  and (iii) as to any matter which does not
affect the  interest of a  particular  class,  including  but not limited to any
proposal to liquidate any other class,  only the holders of Shares of the one or
more affected classes shall be entitled to vote.

      (b) The  presence  in  person  or by proxy of the  holders  of  record  of
one-third of the Shares of all classes  issued and  outstanding  and entitled to
vote thereat shall  constitute a quorum for the  transaction  of any business at
all meetings of the stockholders except as otherwise provided by law or in these
Articles  of  Incorporation  and except  that where the holders of Shares of any
class are entitled to a separate vote as a class (a Separate Class) or where the
holders of Shares of two or more (but not all) classes are required to vote as a
single  class (a  Combined  Class),  the  presence  in person or by proxy of the
holders of record of one-third of the Shares of that Separate  Class or Combined
Class,  as the case may be, issued and  outstanding and entitled to vote thereat
shall constitute a quorum for such vote.

      Notwithstanding  any  provision  of law  requiring  action  to be taken or
authorized  by the  affirmative  vote of the holders of a designated  proportion
greater  than a  majority  of the  outstanding  Shares of all  classes or of the
outstanding  Shares of a particular  class or classes,  as the case may be, such
action shall be valid and effective if taken or  authorized  by the  affirmative
vote of the holders of a majority  of the total  number of Shares of all classes
or of the total  number of Shares of such class or classes,  as the case may be,
outstanding  and entitled to vote thereupon  pursuant to the provisions of these
Articles of Incorporation.

      (c) Any vote of stockholders authorizing liquidation of the Corporation or
any one or more classes,  or proceedings  for the dissolution of the Corporation
or any one or more classes,  may authorize the Board of Directions to determine,
as provided  herein,  or if  provision is not made herein,  in  accordance  with
generally accepted accounting principles,  which assets are the assets belonging
to each class  available for  distribution  to stockholders of the class and may
divide,  or authorize  the Board of  Directors to divide,  such assets among the
stockholders  of that class in such  manner as to ensure  that each  stockholder
will  receive  an equal and  proportionate  amount  of the  value of the  assets
(determined  as  aforesaid)  belonging  to that class upon such  liquidation  or
dissolution.


                                      -8-
<PAGE>

      (d) Except as required by law,  the holders of Shares shall have only such
right to inspect the records,  documents,  accounts and books of the Corporation
as may be granted by the Board of Directors of the Corporation.

                             ARTICLE IX - Amendments

      The  Corporation  reserves the right from time to time to amend,  alter or
repeal any of the provisions of these Articles of  Incorporation  (including any
amendment  that  changes  the  terms  of  any  of  the  outstanding   Shares  by
classification,  reclassification or otherwise),  and to add or insert any other
provisions  that may, under the statutes of the State of Maryland at the time in
force, be lawfully contained in articles of incorporation, and all rights at any
time conferred  upon the  stockholders  of the  Corporation by these Articles of
Incorporation are subject to the provisions of this Article IX.

                         ARTICLE X - PERPETUAL EXISTENCE

      The duration of the Corporation shall be perpetual.

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

      The term  Articles of  Incorporation  as used herein and in the By-Laws of
the  Corporation  shall be deemed to mean these  Articles  of  Incorporation  as
amended from time to time and any restatement thereof.

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


      I  acknowledge  this document to be my act, and state that with respect to
all matters  and facts  herein,  to the best of my  knowledge,  information  and
belief such  matters and facts are true in all  material  respects and that this
statement is made under the penalties of perjury.

October 26, 1994

                                           /s/ Stanley M. Lenkowicz
                                           ------------------------
                                             Stanley M. Lenkowicz
                                             Sole Incorporator

                                      -9-



                                                                    Exhibit 1(b)

                             ARTICLES SUPPLEMENTARY
                                       OF
                   MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.

      Mutual of America  Institutional  Funds, Inc., a Maryland corporation (the
Corporation),  with its principal office c/o Corporation Trust Incorporated,  32
South  Street,  Baltimore,   Maryland  21202,  hereby  certifies  to  the  State
Department of Assessments and Taxation of Maryland that:

      FIRST: The total number of shares of capital stock of all classes that the
Corporation  has  authority  to issue is one billion  (1,000,000,000)  shares of
common  stock,  par value $.01 per  share,  with an  aggregate  par value of ten
million dollars ($10,000,000).

      SECOND:  Pursuant to  authority  vested in the Board of  Directors  of the
Corporation  by Article V of the Articles of  Incorporation  of the  Corporation
(the  Articles),  the Board of Directors has duly designated and established the
following classes of shares:

           Equity        3,000,000 shares
           Bond          3,000,000 shares

The  relative   preferences,   conversion  and  other  rights,   voting  powers,
restrictions,   limitations  as  to  dividends,  qualifications  and  terms  and
conditions  of  redemption of all such classes are as set forth in paragraph (b)
of Section 1 of Article V of the Articles.

      IN WITNESS  WHEREOF,  the  President of the  Corporation  has signed these
Articles  Supplementary  in  the  Corporation's  name  and  on  its  behalf  and
acknowledges  that these Articles  Supplementary are the act of the Corporation,
and states that to the best of her knowledge, information and belief all matters
and facts set forth therein  relating to the  authorization  and approval of the
Articles Supplementary are true in all material respects and that this statement
is made under the penalties of perjury.

Date:  February 20, 1996

                                                  MUTUAL OF AMERICA
                                                  INSTITUTIONAL FUNDS, INC.
Attest:
                                                  /s/ Dolores J. Morrissey
                                                  ------------------------
                                                  Dolores J. Morrissey
/s/ Stanley M. Lenkowicz                          President
- --------------------------
    Stanley M. Lenkowicz
        Secretary

(seal)



                                                                    Exhibit 1(c)

                             ARTICLES SUPPLEMENTARY
                                       OF
                   MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.

      Mutual of America  Institutional  Funds, Inc., a Maryland corporation (the
Corporation),  with its principal office c/o Corporation Trust Incorporated,  32
South  Street,  Baltimore,   Maryland  21202,  hereby  certifies  to  the  State
Department of Assessments and Taxation of Maryland that:

      FIRST: The total number of shares of capital stock of all classes that the
Corporation  has  authority  to issue is one billion  (1,000,000,000)  shares of
common  stock,  par value $.01 per  share,  with an  aggregate  par value of ten
million dollars ($10,000,000).

      SECOND:  Pursuant to  authority  vested in the Board of  Directors  of the
Corporation  by Article V of the Articles of  Incorporation  of the  Corporation
(the Articles),  the Board of Directors has duly redesignated the Equity Fund as
the All America Fund, with 3,000,000 shares.

The  relative   preferences,   conversion  and  other  rights,   voting  powers,
restrictions,   limitations  as  to  dividends,  qualifications  and  terms  and
conditions  of  redemption  of such class are as set forth in  paragraph  (b) of
Section 1 of Article V of the Articles.

      IN WITNESS  WHEREOF,  the  President of the  Corporation  has signed these
Articles  Supplementary  in  the  Corporation's  name  and  on  its  behalf  and
acknowledges  that these Articles  Supplementary are the act of the Corporation,
and states that to the best of her knowledge, information and belief all matters
and facts set forth therein  relating to the  authorization  and approval of the
Articles Supplementary are true in all material respects and that this statement
is made under the penalties of perjury.

Date:  April 8, 1996

                                                  MUTUAL OF AMERICA
                                                  INSTITUTIONAL FUNDS, INC.
Attest:
                                                  /s/ Dolores J. Morrissey
                                                  ------------------------
                                                      Dolores J. Morrissey
/s/ Stanley M. Lenkowicz                              President
- --------------------------
    Stanley M. Lenkowicz
        Secretary

(seal)




                                                                    Exhibit 1(d)

                             ARTICLES SUPPLEMENTARY
                                       OF
                   MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.

      Mutual of America  Institutional  Funds, Inc., a Maryland corporation (the
Corporation),  with its principal office c/o Corporation Trust Incorporated,  32
South  Street,  Baltimore,   Maryland  21202,  hereby  certifies  to  the  State
Department of Assessments and Taxation of Maryland that:

      FIRST: The total number of shares of capital stock of all classes that the
Corporation  has  authority  to issue is one billion  (1,000,000,000)  shares of
common  stock,  par value $.01 per  share,  with an  aggregate  par value of ten
million dollars ($10,000,000).

      SECOND:  Pursuant to  authority  vested in the Board of  Directors  of the
Corporation  by Article V of the Articles of  Incorporation  of the  Corporation
(the Articles), the authorized shares allocated to the All America Fund and Bond
Fund are increased to the following:

            All America Fund     -   25,000,000
            Bond Fund            -   15,000,000

The  relative   preferences,   conversion  and  other  rights,   voting  powers,
restrictions,   limitations  as  to  dividends,  qualifications  and  terms  and
conditions  of  redemption  of such class are as set forth in  paragraph  (b) of
Section 1 of Article V of the Articles.

      IN WITNESS  WHEREOF,  the  President of the  Corporation  has signed these
Articles  Supplementary  in  the  Corporation's  name  and  on  its  behalf  and
acknowledges  that these Articles  Supplementary are the act of the Corporation,
and states that to the best of her knowledge, information and belief all matters
and facts set forth therein  relating to the  authorization  and approval of the
Articles Supplementary are true in all material respects and that this statement
is made under the penalties of perjury.

Date:  December 2, 1996

                                                  MUTUAL OF AMERICA
                                                  INSTITUTIONAL FUNDS, INC.
Attest:
                                                  /s/ Dolores J. Morrissey
                                                  ------------------------
                                                      Dolores J. Morrissey
/s/ Stanley M. Lenkowicz                              President
- --------------------------
    Stanley M. Lenkowicz
        Secretary

(seal)



                                                                    Exhibit 1(e)

                             ARTICLES SUPPLEMENTARY
                                       OF
                   MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.

      Mutual of America  Institutional  Funds, Inc., a Maryland corporation (the
Corporation),  with its principal office c/o Corporation Trust Incorporated,  32
South  Street,  Baltimore,   Maryland  21202,  hereby  certifies  to  the  State
Department of Assessments and Taxation of Maryland that:

      FIRST: The total number of shares of capital stock of all classes that the
Corporation  has  authority  to issue is one billion  (1,000,000,000)  shares of
common  stock,  par value $.01 per  share,  with an  aggregate  par value of ten
million dollars ($10,000,000).

      SECOND:  Pursuant to  authority  vested in the Board of  Directors  of the
Corporation  by Article V of the Articles of  Incorporation  of the  Corporation
(the  Articles),  the Board of Directors has duly designated and established the
following class of shares:

            Money Market Fund              15,000,000 shares

The  relative   preferences,   conversion  and  other  rights,   voting  powers,
restrictions,   limitations  as  to  dividends,  qualifications  and  terms  and
conditions  of  redemption  of such class are as set forth in  paragraph  (b) of
Section 1 of Article V of the Articles.

      IN WITNESS  WHEREOF,  the  President of the  Corporation  has signed these
Articles  Supplementary  in  the  Corporation's  name  and  on  its  behalf  and
acknowledges  that these Articles  Supplementary are the act of the Corporation,
and states that to the best of her knowledge, information and belief all matters
and facts set forth therein  relating to the  authorization  and approval of the
Articles Supplementary are true in all material respects and that this statement
is made under the penalties of perjury.

Date:  February 24, 1997

                                                  MUTUAL OF AMERICA
                                                  INSTITUTIONAL FUNDS, INC.
Attest:
                                                  /s/ Dolores J. Morrissey
                                                  ------------------------
                                                      Dolores J. Morrissey
/s/ Stanley M. Lenkowicz                                    President
- --------------------------
    Stanley M. Lenkowicz
        Secretary

(seal)



                                                                       Exhibit 2

                   MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.
                            (A Maryland Corporation)

                                     BY-LAWS

                            ARTICLE I - Stockholders

      Section l. Place of Meeting.  All  meetings of the  stockholders  shall be
held at the principal  office of the Corporation in the State of New York, or at
such other place within the United States as may from time to time be designated
by the Board of Directors and stated in the notice of such meeting.

      Section 2. Annual Meetings.  The Corporation shall not be required to hold
an annual meeting of stockholders in any year in which the election of directors
is not required under the Investment Company Act of 1940, as amended (1940 Act),
or the 1940 Act does not  otherwise  require  a  meeting  to be held.  An annual
meeting of the stockholders of the  Corporation,  if held, shall be on such date
and at such  hour  as may be  from  time to  time  designated  by the  Board  of
Directors and stated in the notice of such meeting,  for the purpose of electing
directors  and for the  transaction  of such other  business as may  properly be
brought before the meeting.

      Section 3. Special Meetings.  Special meetings of the stockholders for any
purpose or purposes may be called by the Chairman of the Board, the President or
a majority of the Board of Directors,  and shall be called by the Secretary upon
receipt of the request in writing signed by  stockholders  holding not less than
25% of the common stock  issued and  outstanding  and entitled to vote  thereat,
except that a meeting for the purpose of considering  the removal of one or more
directors  shall be called by the Secretary upon receipt of a request in writing
signed by stockholders  holding not less than 10% of the common stock issued and
outstanding and entitled to vote thereat. The Secretary shall assist stockholder
communication for the purpose of obtaining signatures to a request for a meeting
for the purpose of considering the removal of one or more directors, essentially
as set forth in Section 16(c) of the 1940 Act. A stockholders'  request that the
Secretary  call a meeting  shall state the  purpose or purposes of the  proposed
meeting.  The  Secretary  shall  inform  such  stockholders  of  the  reasonably
estimated costs of preparing and mailing notice of the requested  meeting.  Upon
payment to the  Corporation  of such costs by such  stockholders,  the Secretary
shall give notice, stating the purpose or purposes of the meeting as required in
these By-Laws, to all stockholders entitled to notice of the meeting. No meeting
need be called upon the request of the holders of shares  entitled to be cast at
that meeting to consider any matter which is substantially  the same as a matter
voted upon at any  meeting of  stockholders  held  during the  preceding  twelve
months.

      Section 4. Notice of Meetings of Stockholders. Not less than ten days' and
not more than ninety  days'  written  notice of every  meeting of  stockholders,
stating  the time and place  thereof  and the  general  nature  of the  business
proposed to be transacted thereat,  shall be given to each stockholder  entitled
to vote thereat by delivering the same to such stockholder at such

<PAGE>

stockholder's principal place of business or by mailing it, postage prepaid, and
addressed to such stockholder at such  stockholder's  address as it appears upon
the books of the Corporation. If mailed, notice shall be deemed to be given when
deposited  in  the  United  States  mail  addressed  to  the  stockholder.   Any
stockholder who attends any meeting of stockholders in person or by proxy or any
stockholder  who  executes a waiver of notice which is filed with the records of
the meeting,  either before or after the holding  thereof,  waives notice of the
meeting.

      Section 5. Record  Dates.  The Board of Directors  may fix, in advance,  a
date  not  exceeding   ninety  days   preceding  the  date  of  any  meeting  of
stockholders, any dividend payment date or any date for the allotment of rights,
as a record date for the determination of the stockholders entitled to notice of
and to vote at such meeting or entitled to receive such dividends or rights, and
only  stockholders  of record on that date shall be entitled to notice of and to
vote at that  meeting or to receive such  dividends or rights.  In the case of a
meeting of stockholders,  such date shall not be less than ten days prior to the
date fixed for such meeting.  The record date also may not be prior to the close
of business on the day the record date is fixed.

      Section 6. Quorum, Adjournment of Meetings. Subject to Article VIII of the
Corporation's  Articles of Incorporation,  the presence in person or by proxy of
the  holders of record of  one-third  of the  shares of the common  stock of the
Corporation issued and outstanding and entitled to vote thereat shall constitute
a quorum at all meetings of the  stockholders.  If a quorum shall not be present
at any  meeting of the  stockholders,  the  holders  of a majority  of the stock
present in person or by proxy shall have power to adjourn the meeting  from time
to time  (but not more  than 120 days  after the  original  record  date for the
meeting) without notice other than  announcement at the meeting,  until a quorum
shall be present.  At such adjourned meeting at which a quorum shall be present,
any business may be transacted  which might have been  transacted at the meeting
as originally noticed.

      Section  7.  Conduct  of  Stockholders'  Meetings.  Each  meeting  of  the
stockholders  shall be presided  over by the  Chairman  of the Board,  or in the
absence of the Chairman of the Board (or, if there is no Chairman of the Board),
by the  President,  or in the absence of both the  Chairman of the Board and the
President,  by a Vice President, or if none of them is present, by a chairman to
be elected at the meeting. The Secretary of the Corporation,  if present,  shall
act as secretary of the meeting.  In the absence of the Secretary,  an Assistant
Secretary shall so act; if neither the Secretary nor any Assistant  Secretary is
present, then a secretary to be elected at the meeting shall so act.

      Section 8. Voting and Inspectors.  A stockholder may vote Shares in person
or by proxy appointed by instrument in writing subscribed by such stockholder or
the stockholder's duly authorized attorney-in-fact.  The chairman of the meeting
may cause a vote by ballot to be taken upon any  election  or  matter,  and such
vote shall be taken upon the request of the holders of ten percent  (10%) of the
stock entitled to vote on such election or matter.

      At any election of  directors,  the Board of Directors  prior thereto may,
or, if they have not so acted,  the  chairman of the meeting  may,  and upon the
request of the  holders of ten


                                      -2-
<PAGE>

percent (10%) of the stock entitled to vote at such election  shall,  appoint an
inspector  of  election  who shall first  subscribe  an oath or  affirmation  to
execute  faithfully  the  duties  of  inspector  at such  election  with  strict
impartiality  and  according to the best of his or her ability,  and shall after
the election  make a certificate  of the result of the vote taken.  No candidate
for the office of director shall be appointed an inspector of election.

      Section 9. Concerning Validity of Proxies,  Ballots, etc. At every meeting
of the  stockholders,  all proxies shall be received and taken in charge of, and
all ballots  shall be received and  canvassed  by, the secretary of the meeting,
who shall decide all  questions  concerning  the  qualification  of voters,  the
validity of the proxies and the  acceptance  or  rejection  of votes,  unless an
inspector of election  shall have been appointed by the chairman of the meeting,
in which event such inspector of election shall decide all such questions.

                         ARTICLE II - Board of Directors

      Section 1. Number and Tenure of Office.  The Board of  Directors  may from
time to time  determine  the number of  directors,  which shall be not less than
three  nor more than ten.  Each  director  shall  hold  office  until his or her
successor shall have been elected and qualified.  If at any time after the first
meeting of  stockholders  less than a majority  of the  directors  then  holding
office  has  been  elected  by  the  stockholders,  an  annual  meeting  of  the
stockholders shall be called for the purpose of electing the Board of Directors.
Directors need not be stockholders.

      Section 2. Vacancies.  Except as otherwise  provided in Section 1, in case
of any vacancy in the Board of Directors  through  death,  resignation  or other
cause,  other than an  increase  in the number of  directors,  a majority of the
remaining  directors,  although  a majority  is less than a quorum,  may elect a
successor to hold office until the next meeting of  stockholders or until his or
her successor is chosen and  qualifies,  if, at any time after the first meeting
of  stockholders,  immediately  after filling the vacancy at least two-thirds of
the directors then in office have been elected by the stockholders.

      Section  3.  Increase  or  Decrease  in  Number  of  Directors.  Except as
otherwise  provided in Section 1 or 2, the Board of Directors,  by the vote of a
majority of the entire  Board,  may increase  the number of directors  and elect
directors  to fill the  vacancies  created  by any such  increase.  The Board of
Directors,  by the vote of a majority of the entire Board, may likewise decrease
the  number of  directors,  but any such  decrease  shall not affect the term in
office of any director.

      Section 4. Place of Meeting.  The directors may hold their meetings at any
place in or  outside  the  State  of  Maryland  as they  may  from  time to time
determine by  resolution  or as shall be  specified  or fixed in the  respective
notices or waivers of notice.

      Section 5. Regular Meetings and Special Meetings.  Regular meetings of the
Board of Directors  shall be held at such time and on such notice,  which may be
oral  (including by


                                      -3-
<PAGE>

telephone) or written (including by fax), as the directors may from time to time
determine.  Special  meetings of the Board of Directors may be held from time to
time upon call of the Chairman of the Board, the President, the Secretary or two
or more of the  directors,  by oral or written  notice duly served on or sent or
mailed to each director not less than one day before the meeting.

      Section 6. Waiver of Notice.  Any  director who attends any meeting of the
Board of  Directors  in person or any  director  who executes a waiver of notice
that is filed with the records of the meeting either before or after the holding
thereof,  waives  notice of such  meeting.  Notice or waiver of notice  need not
state the purpose or purposes of the meeting.

      Section  7.  Quorum.  One-third  of the  directors  then in  office  shall
constitute  a quorum for the  transaction  of business,  provided  that a quorum
shall in no case be less  than two  directors.  If at any  meeting  of the Board
there  shall be less than a quorum  present,  a majority  of those  present  may
adjourn the meeting from time to time until a quorum  shall have been  obtained.
The act of the majority of the  directors  present at any meeting at which there
is a  quorum  shall  be the act of the  Board  of  Directors,  except  as may be
otherwise  specifically  provided by the 1940 Act, the Articles of Incorporation
or these By-Laws.

      Section 8. Executive Committee.  The Board of Directors may elect from the
directors  an Executive  Committee  to consist of such number of directors  (not
less than two) as the Board may from time to time determine. The Chairman of the
Committee  shall be elected by the Board of  Directors.  The Board of  Directors
shall  have power at any time to change the  members of such  Committee  and may
fill vacancies in the Committee by election from the directors. Between meetings
of the Board of Directors,  the Executive  Committee may exercise all the powers
of the Board of  Directors  except  those  listed in Section  10. The  Executive
Committee may fix its own rules of procedure,  and may meet when and as provided
by such rules or by resolution of the Board of Directors,  but in every case the
presence of a majority  shall be  necessary to  constitute a quorum.  During the
absence  of a member of the  Executive  Committee,  the  remaining  members  may
appoint  a member of the Board of  Directors  to act in the place of the  absent
member.

      Section 9. Other  Committees.  The Board of  Directors  may appoint  other
committees  which shall in each case  consist of such number of  directors  (not
less than two) as the Board may from time to time determine and which shall have
and may  exercise  such  powers  as the Board may  determine  in the  resolution
appointing  them.  A  majority  of all the  members  of any such  committee  may
determine  its  action  and fix the time and place of its  meetings,  unless the
Board of Directors  shall otherwise  provide.  The Board of Directors shall have
power at any time to change the  members  and powers of any such  committee,  to
fill vacancies and to discharge any such committee.

      Section 10. Powers of  Committees.  The Board of Directors may delegate to
any of the  committees  appointed  under Section 8 or 9 any of the powers of the
Board of Directors,  except the power to: (1) declare dividends or distributions
on stock;  (2) issue  stock  except  pursuant  to a  general  formula  or method
specified  by the  Board  of  Directors  by  resolution;  (3)  recommend


                                      -4-
<PAGE>

to the stockholders any action which requires  stockholder  approval;  (4) amend
the By-Laws;  or (5) approve any merger or share exchange which does not require
stockholder approval.

      Section 11.  Telephone  Meetings.  Members of the Board of  Directors or a
committee of the Board of Directors may  participate  in a meeting by means of a
conference  telephone  or  similar  communications   equipment  if  all  persons
participating in the meeting can hear each other at the same time. Participation
in a meeting by these means constitutes presence in person at the meeting.

      Section  12.  Action  Without a Meeting.  Except to the  extent  otherwise
specifically  provided by applicable law, any action required or permitted to be
taken at any meeting of the Board of Directors or any  committee  thereof may be
taken  without a meeting,  if a written  consent to such action is signed by all
members of the Board or of such committee,  as the case may be, and such written
consent  is filed  with the  minutes  of the  proceedings  of the  Board or such
committee.

      Section 13.  Compensation  of  Directors.  No director  shall  receive any
stated salary or fees from the Corporation for services as such if such director
is, other than by reason of being a director, an interested person (as that term
is defined by the 1940 Act) of the  Corporation or of its investment  adviser or
principal underwriter.  Except as provided in the preceding sentence,  directors
shall be entitled to receive such  compensation  from the  Corporation for their
services as may from time to time be voted by the Board of Directors.

                             ARTICLE III - Officers

      Section l. Executive  Officers.  The executive officers of the Corporation
shall be chosen by the Board of Directors.  The  officers,  none of whom need be
directors,  shall  include a  President,  a Secretary  and a  Treasurer  and may
include a Chairman of the Board, one or more Executive Vice  Presidents,  one or
more  Senior  Vice  Presidents  and one or more  Vice  Presidents.  The Board of
Directors  or  the  Executive  Committee  may  also  in its  discretion  appoint
Assistant  Secretaries,  Assistant  Treasurers  and other  officers,  agents and
employees, who shall have such authority and perform such duties as the Board of
Directors or the Executive  Committee may determine.  The Board of Directors may
fill any vacancy which may occur in any office. Any two offices, except those of
President  and Vice  President,  may be held by the same person,  but no officer
shall  execute,  acknowledge or verify any instrument in more than one capacity,
if  such  instrument  is  required  by  law or  these  By-Laws  to be  executed,
acknowledged or verified by two or more officers.

      Section 2. Term of  Office.  The term of office of all  officers  shall be
until their  respective  successors are chosen and  qualified,  and such term of
office shall not create any contract  rights in the officer.  Any officer may be
removed from office at any time with or without  cause by the vote of a majority
of the Board of Directors.


                                      -5-
<PAGE>

      Section 3. Powers and Duties.  The officers of the Corporation  shall have
such powers and duties as generally pertain to their respective offices, as well
as such powers and duties not  inconsistent  with these By-Laws as may from time
to time  be  conferred  on  them by the  Board  of  Directors  or the  Executive
Committee.

                           ARTICLE IV - Capital Stock

      Section l.  Transfer  of Shares.  Unless  the Board of  Directors  directs
otherwise,  Shares of the  Corporation  shall be  non-certificated,  and  issued
Shares shall be maintained in book-entry form by the  Corporation.  If issued in
certificate  form,  Shares of the Corporation shall be transferable on the books
of the  Corporation  by the  holder  thereof in person or by the  holder's  duly
authorized attorney or legal representative,  upon surrender and cancellation of
certificates,  if  any,  for  the  same  number  of  shares,  duly  endorsed  or
accompanied by proper instruments of assignment and transfer, with such proof of
the  authenticity  of  the  signature  as the  Corporation  or  its  agents  may
reasonably require.  In the case of Shares not represented by certificates,  the
same or similar  requirements shall be imposed, as determined by officers of the
Corporation.

      Section 2. Stock Ledgers. The stock ledgers of the Corporation, containing
the names and  addresses  of the  stockholders  and the number of shares held by
them respectively,  shall be kept at the principal office of the Corporation or,
if the Corporation employs a Transfer Agent, at the office of the Transfer Agent
of the Corporation.

      Section 3. Lost, Stolen or Destroyed Certificates.  The Board of Directors
or the  Executive  Committee  may  determine  the  conditions  upon  which a new
certificate of stock of the Corporation of any class may be issued in place of a
certificate which is alleged to have been lost, stolen or destroyed, and may, in
its  discretion,  require  the  owner of such  certificate  to give  bond,  with
sufficient surety, to indemnify the Corporation against any loss or claims which
may arise as a result of the issue of a new certificate.

                           ARTICLE V - Corporate Seal

      The Board of Directors may provide for a suitable  corporate seal, in such
form and bearing such inscriptions as it may determine.

                            ARTICLE VI - Fiscal Year

      The fiscal year of the Corporation shall end on December 31.


                                      -6-
<PAGE>

                          ARTICLE VII - Indemnification

      Section 1. The Corporation  shall indemnify any present or former director
or  officer  of the  Corporation  who,  by reason of his or her  service in that
capacity,  is made a party to any threatened,  pending or completed action, suit
or  proceeding,   whether  civil,  criminal,   administrative  or  investigative
(hereinafter  collectively  referred  to  as a  Proceeding)  against  judgments,
penalties, fines, settlements, and reasonable expenses actually incurred by such
director or officer in connection  with such  Proceeding,  to the fullest extent
that such  indemnification  may be lawful under the General  Corporation  Law of
Maryland,  as  amended.  The  Corporation  may pay any  reasonable  expenses  so
incurred by any director or officer in defending a Proceeding  in advance of the
final disposition thereof to the fullest extent that such advance payment may be
lawful  under the  applicable  Maryland  statutory  provision.  Any  payment  of
indemnification  or advance  payment of expenses shall be made subject to and in
accordance  with the procedures set forth in the applicable  Maryland  statutory
provision.  However,  nothing contained in the Articles of Incorporation or this
Section  shall  protect or purport to  protect  any  director  or officer of the
Corporation  against any liability to which he or she would otherwise be subject
by reason of  willful  misfeasance,  bad faith,  gross  negligence  or  reckless
disregard  of the duties  involved in the conduct of his or her office (any such
conduct being hereinafter called Disabling Conduct).

      Section 2. Notwithstanding  Section l, no indemnification shall be paid by
the Corporation to any director or officer unless:

      (a)   there is a final  decision  on the  merits by a court or other  body
            before whom the  Proceeding was brought that the director or officer
            to be indemnified was not liable by reason of Disabling Conduct,  or
            there is a dismissal of either a court  action or an  administrative
            proceeding  against the  director or officer  for  insufficiency  of
            evidence of any Disabling Conduct; or

      (b)   a  reasonable  determination,  based upon a review of the facts,  is
            made that the director or officer to be  indemnified  was not liable
            by reason of Disabling Conduct,  which  determination  shall be made
            by:

            (i)   the  vote of a  majority  of a  quorum  of  directors  who are
                  neither  interested  persons of the  Corporation as defined in
                  section  2(a)(19)  of the 1940 Act nor  parties to the related
                  Proceeding; or

            (ii)  an independent legal counsel in a written opinion.

      Section 3.  Notwithstanding  Section 1, any advance payment of expenses by
the Corporation to any director or officer of the Corporation shall be made only
upon the  written  affirmation  by such  director  or officer of his or her good
faith belief that no Disabling  Conduct has occurred and the undertaking by such
director or officer to repay the advance unless it is


                                      -7-
<PAGE>

ultimately  determined that he or she is entitled to indemnification as provided
above, and only if one of the following conditions is met:

      (a)   the  director or officer to be  indemnified  provides a security for
            his or her undertaking; or

      (b)   the Corporation shall be insured against losses arising by reason of
            any lawful advances; or

      (c)   there is a  determination,  based on a review of  readily  available
            facts,  that there is reason to believe that the director or officer
            to be indemnified  ultimately  will be entitled to  indemnification,
            which determination shall be made by:

            (i)   a majority of a quorum of directors who are neither interested
                  persons of the  Corporation as defined in section  2(a)(19) of
                  the 1940 Act nor parties to the related Proceeding; or

            (ii)  an independent legal counsel in a written opinion.

                       ARTICLE VIII - Amendment of By-Laws

      The  By-Laws  of the  Corporation  may be  altered,  amended,  added to or
repealed by the stockholders or by majority vote of the Board of Directors.


                                      -8-


                                                                       Exhibit 5

                             DISTRIBUTION AGREEMENT

         AGREEMENT  made this 1st day of May,  1996  between  MUTUAL OF  AMERICA
INSTITUTIONAL  FUNDS,  INC., a corporation  organized under the laws of Maryland
(the "Investment  Company"),  and MUTUAL OF AMERICA  SECURITIES  CORPORATION,  a
Delaware corporation (the "Distributor"):

                              W I T N E S S E T H :

      WHEREAS, the Investment Company is registered under the Investment Company
Act of 1940,  as  amended  (the  "Investment  Company  Act"),  as a  diversified
open-end management investment company; and

      WHEREAS,  the Investment  Company is authorized to issue shares of capital
stock  ("shares")  in separate  series,  each of which  pursues  its  investment
objective through separate investment policies (each a "Fund"); and

      WHEREAS,  the Distributor is duly registered as a broker-dealer  under the
Securities  Exchange Act of 1934 and is a member of the National  Association of
Securities Dealers, Inc. (the "NASD"); and

      WHEREAS,  the  Investment  Company  desires  the  Distributor  to  be  its
principal  underwriter  and  distributor  with  respect to  distribution  of the
shares; and

      WHEREAS,  the Investment Company and the Distributor wish to enter into an
agreement with each other with respect to the continuous offering of the shares,
in order to  promote  the  growth of the assets of the  Investment  Company  and
facilitate the distribution of its shares;

      NOW, THEREFORE, the parties agree as follows:

      Section 1. Appointment of the Distributor.  The Investment  Company hereby
appoints the  Distributor as the principal  underwriter  and  distributor of the
Investment  Company to sell its  shares to  persons  and  entities  eligible  to
purchase  shares  ("Purchasers")  as set forth in the Investment  Company's then
current  prospectus  ("Prospectus"),  and the  Distributor  hereby  accepts such
appointment  and agrees to serve without  compensation.  The Investment  Company
during the term of this Agreement shall sell its shares to the Distributor  upon
the terms and conditions set forth below.

<PAGE>

      Section  2.  Exclusive  Nature of  Duties.  The  Distributor  shall be the
exclusive   representative  of  the  Investment  Company  to  act  as  principal
underwriter and distributor.

      Section 3. Purchase of Shares from the Investment Company.

      (a) The Investment Company will offer the shares and the Distributor shall
have the right to buy from the  Investment  Company the shares  needed,  but not
more than the shares needed (except for clerical errors in transmission) to fill
unconditional  orders  for  shares of the  Investment  Company  placed  with the
Distributor by the Purchasers. The price which the Distributor shall pay for the
shares of each Fund so purchased  from the  Investment  Company shall be the net
asset  value per share of such Fund,  determined  as set forth in  Section  3(c)
hereof.

      (b) The  shares of each Fund are to be  resold by the  Distributor  to the
Purchasers at the net asset value per share of such Fund.

      (c) The net asset value of shares of each Fund of the  Investment  Company
shall be determined by the  Investment  Company,  or any agent of the Investment
Company, at the close of trading on the New York Stock Exchange on each business
day on which the New York Stock Exchange is open for trading, in accordance with
the method set forth in the Prospectus  and guidelines  established by the Board
of Directors of the Investment  Company.  The Investment  Company may also cause
the net asset value of shares of each Fund to be determined in substantially the
same  manner or  estimated  in such manner and as of such other hour or hours as
may from time to time be agreed  upon in writing by the  Investment  Company and
the Distributor.  All payments to the Investment Company hereunder shall be made
in the manner set forth in Section 3(e).

      (d) The  Investment  Company  shall have the right to suspend  the sale of
shares  of any of its  Funds at times  when  redemption  of any such  shares  is
suspended  pursuant to the  conditions  set forth in Section  4(b)  hereof.  The
Investment  Company  shall also have the right to suspend  the sale of shares of
any or all of its Funds if  trading on the New York  Stock  Exchange  shall have
been suspended,  if a banking  moratorium shall have been declared by Federal or
New York  authorities,  or if there  shall  have been some  other  extraordinary
event, which, in the judgment of the Investment Company,  makes it impracticable
to sell any such shares.

      (e)  The  Investment  Company,  or any  agent  of the  Investment  Company
designated in writing by the Investment  Company,  shall be promptly  advised of
all purchase  orders for shares of each Fund  received by the  Distributor.  The
Investment  Company (or its agent) will confirm orders upon their receipt,  will
make appropriate book entries and upon receipt by the Investment Company (or its
agent) of payment  therefor,  will deliver deposit  receipts or certificates for
such shares pursuant to the  instructions of the  Distributor.  Payment shall be
made to the Investment Company in Federal funds or as otherwise specified in the
Investment  Company's then current  Prospectus.  The Distributor agrees to cause
such payment and such  instructions  to be delivered  promptly to the Investment
Company (or its agent).


                                       2
<PAGE>

      Section 4. Repurchase or Redemption of Shares by the Investment Company.

      (a)  Any of the  outstanding  shares  of each  Fund  may be  tendered  for
redemption  at any time,  and the  Investment  Company  agrees to  repurchase or
redeem any such shares so tendered in  accordance  with its  obligations  as set
forth in its Articles of  Incorporation,  as amended  from time to time,  and in
accordance with the applicable provisions set forth in the Prospectus. The price
to be paid to redeem or repurchase  shares of any Fund shall be equal to the net
asset value per share of such Fund  calculated in accordance with the provisions
of Section 3(c) hereof.  All payments by the Investment  Company hereunder shall
be made in the manner set forth below.

      The Investment  Company shall pay the total amount of the redemption price
as  defined  in  the  above  paragraph  pursuant  to  the  instructions  of  the
Distributor  in Federal  funds,  or as  otherwise  specified  in the  Investment
Company's  Prospectus,  on or before the second  business day  subsequent to its
having received the notice of redemption in proper form.

      (b)  Redemption of shares of any Fund or payment may be suspended at times
when the New York Stock  Exchange is closed,  when  trading on said  Exchange is
closed, when trading on said Exchange is restricted, when an emergency exists as
a result of which disposal by the Investment  Company of securities  owned by it
for such Fund is not reasonably  practicable or it is not reasonably practicable
for the  Investment  Company  fairly to determine the value of the net assets of
such  Fund,  or  during  any  other  period  when the  Securities  and  Exchange
Commission, by order, so permits.

      Section 5. Duties of the Investment Company.

      (a) The Investment  Company shall furnish to the Distributor copies of all
information,  financial  statements and other papers which the  Distributor  may
reasonably  request for use in connection with the distribution of shares of the
Investment  Company,  and this  shall  include  one copy,  upon  request  by the
Distributor, of all financial statements prepared for the Investment Company and
certified by independent public  accountants.  The Investment Company shall make
available  to  the  Distributor  such  number  of  camera  ready  copies  of its
Prospectus, Statement of Additional Information, and supplements thereto, as the
Distributor shall reasonably request.

      (b) The Investment  Company shall take,  from time to time, but subject to
any necessary approval of its shareholders, all necessary action to maintain its
registration  as an investment  company under the Investment  Company Act and to
fix the  number  of its  authorized  shares  and to  register  shares  under the
Securities  Act of 1933,  to the end that there will be available  for sale such
number of shares as Purchasers may reasonably be expected to purchase.

      (c) The  Investment  Company  shall use its best  efforts to  qualify  and
maintain the  qualification  of an  appropriate  number of shares of each of its
Funds for sale under the securities  laws of such states as the  Distributor and
the Investment  Company may approve,  if such  qualification is required by such
securities laws. Any such qualification may be withheld, terminated or withdrawn
by the Investment Company at any time in its discretion.  As provided


                                       3
<PAGE>

in  Section  8(c)  hereof,  the  expense of  qualification  and  maintenance  of
qualification  of shares of a Fund shall be borne by such Fund. The  Distributor
shall furnish such  information  and other material  relating to its affairs and
activities as may be required by the Investment  Company in connection with such
qualification.

      (d) The Investment  Company will furnish,  in reasonable  quantities  upon
request  by the  Distributor,  copies  of  annual  and  interim  reports  of the
Investment Company.

      Section 6. Duties of the Distributor.

      (a) The  Distributor  shall  devote  reasonable  time and effort to effect
sales of shares of the  Investment  Company,  but shall not be obligated to sell
any specific number of shares. The services of the Distributor hereunder are not
to  be  deemed   exclusive  and  nothing  herein  contained  shall  prevent  the
Distributor from entering into  distribution  arrangements with other investment
companies  so  long  as the  performance  of its  obligations  hereunder  is not
impaired thereby.

      (b) In selling the shares of the Investment Company, the Distributor shall
use its best efforts in all respects  duly to conform with the  requirements  of
all  federal and state laws and  regulations  and the  regulations  of the NASD,
relating  to the sale of such  securities.  Upon the  written  direction  of the
Investment  Company,  the Distributor  may select one or more dealers  complying
with such requirements (each a "selected dealer") to participate in the purchase
and  sale  of  Fund  shares  pursuant  to a form of  agreement  approved  by the
Investment  Company.  Neither the  Distributor  nor any selected  dealer nor any
other person is authorized by the Investment  Company to give any information or
to make any  representations,  other than those  contained  in the  registration
statement or related Prospectus and any sales literature  specifically  approved
by the Investment Company.

      Section 7. Payment of Expenses.

      (a) The  Investment  Company  shall  bear all  costs and  expenses  of the
Investment  Company,  including  fees  and  disbursements  of  its  counsel  and
auditors,  in  connection  with  the  preparation  and  filing  of any  required
registration  statements and prospectuses  under the Investment Company Act, the
Securities Act, and all amendments and supplements  thereto,  and the expense of
preparing,  printing,  mailing and otherwise  distributing to  shareholders  its
prospectuses, annual or interim reports to shareholders and proxy materials.

      (b) Each Fund shall bear the costs and expenses of qualification of shares
of such Fund for sale,  and the  Distributor  shall bear the cost and expense of
qualifying the  Distributor as a broker or dealer,  in such states of the United
States or other jurisdictions as shall be selected by the Investment Company and
the Distributor  pursuant to Section 5(c) hereof.  The Investment  Company shall
bear  the  costs  and  expenses  payable  to  each  such  state  for  continuing
qualification  of Fund shares  therein until the Investment  Company  decides to
discontinue such qualification pursuant to Section 5(c) hereof.


                                       4
<PAGE>

      Section 8. Indemnification.

      (a)  The  Investment   Company  shall  indemnify  and  hold  harmless  the
Distributor and each person,  if any, who controls the  Distributor  against any
loss,  liability,  claim,  damage or expense  (including the reasonable  cost of
investigating or defending any alleged loss, liability, claim, damage or expense
and reasonable counsel fees incurred in connection  therewith) arising by reason
of any person acquiring any shares,  which may be based upon the Securities Act,
or on any other  statute or at common  law,  on the ground  that the  Investment
Company's  registration  statement or related  Prospectus,  as from time to time
amended and  supplemented,  or the annual or interim  reports to shareholders of
the Investment Company, includes an untrue statement of a material fact or omits
to state a material fact required to be stated  therein or necessary in order to
make the statements  therein not  misleading,  unless such statement or omission
was made in reliance upon, and in conformity with,  information furnished to the
Investment  Company in connection  therewith by or on behalf of the Distributor;
provided,  however,  that  in no case  (i) is the  indemnity  of the  Investment
Company  in favor of the  Distributor  and any such  controlling  persons  to be
deemed to protect  such  Distributor  or any such  controlling  persons  thereof
against any liability to the Investment Company or its shareholders to which the
Distributor or any such controlling persons would otherwise be subject by reason
of willful misfeasance,  bad faith or gross negligence in the performance of its
duties or by reason of reckless  disregard of its  obligations  and duties under
this  Agreement;  or (ii) is the  Investment  Company  to be  liable  under  its
indemnity  agreement  contained in this paragraph with respect to any claim made
against the Distributor or any such controlling persons,  unless the Distributor
or such  controlling  persons,  as the  case may be,  shall  have  notified  the
Investment  Company in writing  within a  reasonable  time after the  summons or
other first legal process  giving  information  or the nature of the claim shall
have been served upon the Distributor or such controlling  persons (or after the
Distributor  or such  controlling  persons  shall have  received  notice of such
service on any designated  agent),  but failure to notify the Investment Company
of any such claim shall not relieve it from any  liability  which it may have to
the person against whom such action is brought  otherwise than on account of its
indemnity agreement contained in this paragraph.  The Investment Company will be
entitled to participate at its own expense in the defense,  or, if it so elects,
to assume the defense of any suit brought to enforce any such liability,  but if
the  Investment  Company  elects to assume the defense,  such  defense  shall be
conducted by counsel chosen by it and  satisfactory  to the  Distributor or such
controlling person or persons, defendant or defendants in the suit. In the event
the Investment  Company elects to assume the defense of any such suit and retain
such counsel,  the Distributor or such controlling person or persons,  defendant
or  defendants in the suit,  shall bear the fees and expenses of any  additional
counsel  retained by them but, in case the Investment  Company does not elect to
assume the defense of any such suit, it will  reimburse the  Distributor or such
controlling  person or persons,  defendant or  defendants  in the suit,  for the
reasonable  fees and expenses of any counsel  retained by them.  The  Investment
Company  shall  promptly  notify  the  Distributor  of the  commencement  of any
litigation  or  proceedings  against it or any of its  officers or  directors in
connection with the issuance or sale of the shares.


                                       5
<PAGE>

      (b) The  Distributor  shall  indemnify  and hold  harmless the  Investment
Company and each of its  directors  and officers  and each  person,  if any, who
controls the Investment Company against any loss,  liability,  claim, damage, or
expense described in the foregoing indemnity contained in subsection (a) of this
Section,  (i) but only with respect to statements or omissions  made in reliance
upon, and in conformity with, information furnished to the Investment Company in
writing  by or on  behalf  of the  Distributor  for use in  connection  with the
Investment Company's registration statement or related Prospectus,  as from time
to time amended, or the annual or interim reports to shareholders, or (ii) based
on any breach of this  Agreement  by the  Distributor  or any of its officers or
representatives.  In case any action  shall be brought  against  the  Investment
Company or any person so  indemnified,  in  respect  of which  indemnity  may be
sought against the Distributor, the Distributor shall have the rights and duties
given to the Investment  Company,  and the Investment Company and each person so
indemnified  shall have the rights and duties  given to the  Distributor  by the
provisions of subsection (a) of this Section 8.

      Section 9. Duration and  Termination  of This  Agreement.  This  Agreement
shall become  effective  as of the date first above  written and shall remain in
force for two  years and  thereafter,  but only so long as such  continuance  is
specifically  approved at least  annually by (i) the Board of  Directors  of the
Investment  Company,  or by the vote of a  majority  of the  outstanding  voting
securities of the  Investment  Company,  cast in person or by proxy,  and (ii) a
majority of those  directors who are not parties to this Agreement or interested
persons of any such party cast in person at a meeting  called for the purpose of
voting upon such approval. This Agreement may be terminated at any time, without
the payment of any penalty,  by the Board of Directors of the Investment Company
or by vote of a majority of the outstanding  voting securities of the Investment
Company,  or by the  Distributor,  on sixty  days'  written  notice to the other
party.  This  Agreement  shall  automatically  terminate  in  the  event  of its
assignment.

      The terms  "vote of a  majority  of the  outstanding  voting  securities,"
"assignment,"  "affiliated  person" and  "interested  person," when used in this
Agreement, shall have the respective meaning specified in the Investment Company
Act.

      Section 10. Amendments.  This Agreement may be amended by the parties only
if such amendment is specifically  approved by (i) the Board of Directors of the
Investment  Company,  or  by  the  vote  of a  majority  of  outstanding  voting
securities of the Investment Company,  and (ii) a majority of those directors of
the  Investment  Company who are not  parties to this  Agreement  or  interested
persons of any such party cast in person at a meeting  called for the purpose of
voting on such approval.

      Section 11. Governing Law. This Agreement shall be construed in accordance
with the laws of the  State of New  York and the  applicable  provisions  of the
Investment  Company  Act. To the extent the  applicable  law of the State of New
York, or any of the provisions herein,  conflict with the applicable  provisions
of the Investment Company Act, the latter shall control.


                                       6
<PAGE>

      IN WITNESS  WHEREOF,  the parties  hereto have executed and delivered this
Agreement in New York, New York as of the day and year first above written.

                                              MUTUAL OF AMERICA
                                               INSTITUTIONAL FUNDS, INC.


Attest: /s/ Stanley M. Lenkowicz              By:  /s/ Dolores J. Morrissey
        ------------------------                   -------------------------
                  Secretary                                President

                                              MUTUAL OF AMERICA SECURITIES
                                              CORPORATION

                                              By:  /s/ Amir Lear
                                                   -------------------------
Attest: /s/ Stephanie J. Kopp                             President
        ------------------------
                    Secretary


                                       7



                                                                    Exhibit 8(c)

                      AGREEMENT TO PAY OPERATING EXPENSES

This  Agreement to Pay Operating  Expenses is made as of January 1, 1999 between
Mutual of America Capital Management  Corporation,  a Delaware  corporation (the
Adviser),   and  Mutual  of  America   Institutional  Funds,  Inc.,  a  Maryland
corporation (the Investment Company).

WHEREAS, the Adviser serves as investment adviser for the portfolios (the Funds)
of the Investment Company; and

WHEREAS,  the  Adviser  has  voluntarily  reimbursed  or  otherwise  limited the
operating expenses of each of the Funds since its inception date; and

WHEREAS,  the Investment Company desires that the Adviser's voluntary payment of
expenses be formalized in this Agreement, and the Adviser is willing to do so on
the terms and conditions set forth herein.

NOW,  THEREFORE,  in consideration of the mutual promises herein contained,  the
Investment  Company and the  Adviser,  intending to be legally  bound,  mutually
covenant and agree as follows:

Section 1.  Payment of  Expenses.  The Adviser  agrees to reimburse or otherwise
limit the  expenses of the Funds,  other than for advisory  fees,  extraordinary
expenses and portfolio  transaction costs, so that such expenses will not exceed
the following annual rates of net assets, accrued on a daily basis:

      Equity Index Fund -- .20%,  All America  Fund -- .35%,  Bond Fund -- .25%,
      and Money Market Fund -- .20%.

As a result of such payment by the Adviser of operating expenses, the Funds will
have  maximum  total  annual  expenses,  excluding  extraordinary  expenses  and
portfolio transaction costs, at the following annual rates of net assets:

      Equity Index Fund -- .325%,  All America Fund -- .85%,  Bond Fund -- .70%,
      and Money Market Fund -- .40%.

Section 2. Determination of Expense Accruals. At least quarterly, the Investment
Company will  determine the  appropriate  daily  expense  accrual to be assessed
against  the net assets of each of the Funds and will  inform the Adviser of the
then current rates of expense accruals for the Funds.

<PAGE>

Section 3.  Payment of Expenses by the Adviser.  The  Adviser,  on behalf of the
Funds and the Investment  Company,  will pay all bills and expenses of the Funds
and the  Investment  Company  as they  become  due and  payable,  other than for
advisory fees, extraordinary expenses and portfolio transaction costs.

Section  4.  Payment  of  Accrued  Amounts  to the  Adviser.  At the end of each
calendar  month,  the  Investment  Company will pay, or cause to be paid, to the
Adviser all amounts then held by the Investment  Company's custodian as a result
of daily  accruals of expenses  against the net assets of the Funds  during that
calendar month, other than accruals for advisory fees or extraordinary expenses.
For any calendar  year,  the Adviser shall not receive or retain from any of the
Funds an amount of accrued expenses that exceeds the actual amount of the Fund's
operating expenses for the year.

Section 5. Term of  Agreement.  This  Agreement  will  continue in effect  until
December  31,  1999 and will  continue  in effect  from year to year  thereafter
unless  cancelled  by (i) the  Investment  Company  upon not less  than 30 days'
written  notice to the Adviser,  or (ii) the Adviser upon written  notice to the
Investment  Company delivered within the two week period between December 16 and
December 30, in which case this  Agreement will terminate as of January 1 of the
upcoming year.

IN WITNESS  WHEREOF,  authorized  officers  of the  Adviser  and the  Investment
Company have signed this Agreement as of the date first written above.

MUTUAL OF AMERICA CAPITAL                      MUTUAL OF AMERICA
MANAGEMENT CORPORATION                         INSTITUTIONAL FUNDS, INC.

By:   /s/ Richard J. Ciecka                     By:   /s/ Dolores J. Morrissey
      ----------------------                          ------------------------
Name:  Richard J. Ciecka                       Name:  Dolores J. Morrissey
Title: President and CEO                       Title: President

Attest:                                        Attest:

     /s/ Stanley M. Lenkowicz                       /s/ Stanley M. Lenkowicz
- ---------------------------------              ---------------------------------
Stanley M. Lenkowicz                           Stanley M. Lenkowicz
Senior Vice President, Deputy                  Senior Vice President, Deputy
General Counsel and Secretary                  General Counsel and Secretary


                                      -2-



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