Exhibit 99.(1)(i)

MUTUAL OF AMERICA INSTITUTIONAL FUNDS, INC.

ARTICLES SUPPLEMENTARY

Mutual of America Institutional Funds, Inc., a Maryland corporation and a registered open-end investment company under the Investment Company Act of 1940  (the “Corporation”), with its principal office c/o The Corporation Trust Incorporated, 300 East Lombard 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).  Of this total, 890,000,000 shares were unallocated prior to the date hereof.

SECOND:  The shares allocated to the Aggressive Equity Fund  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”), which, prior to the date hereof, was ten million (10,000,000) shares of common stock.

THIRD:  Pursuant to a duly adopted resolution by the Board of Directors of the Corporation, the Aggressive Equity Fund has been dissolved and the shares allocated to the Aggressive Equity Fund, whether issued or unissued, are hereby returned to the remaining authorized but unallocated shares of capital stock of the Corporation, which shall hereby total 900,000,000.

Allocations for all other classes not shown remain unchanged.  The relative preferences, conversion and other rights, voting powers, restrictions, limitations as to dividends, qualifications and terms and conditions of redemption of each such class are the same as for shares previously allocated to the other classes of shares issued by the Corporation prior to the date hereof.

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 his 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.

Dated:  March 5, 2008

Attest:	MUTUAL OF AMERICA
	INSTITUTIONAL FUNDS, INC.
/s/ Thomas L. Martin	/s/ John R. Greed
Thomas L. Martin, Secretary	John R. Greed, Chairman, President and Chief Executive Officer