497 1 d571377d497.htm NORTHERN INSTITUTIONAL FUNDS Northern Institutional Funds

August 16, 2013


Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549



Northern Institutional Funds (the “Trust”)


1933 Act Registration No. 2-80543


1940 Act Registration No. 811-03605

Ladies and Gentlemen:

On behalf of the Trust, transmitted herewith for filing pursuant to Rule 497 under the Securities Act of 1933, as amended (“Rule 497”), are exhibits containing risk/return summary information in the eXtensible Business Reporting Language (XBRL) format that reflect the risk/return summary information included in the prospectus supplement for the Trust’s Treasury Portfolio dated July 31, 2013, filed pursuant to Rule 497 on July 31, 2013 (accession number 0001193125-13-311913).

Questions and comments concerning the filing may be directed to the undersigned at (312) 557-1441.


Very truly yours,

/s/ Jose J. Del Real

Jose J. Del Real




Craig Carberry, Esquire


Diana E. McCarthy, Esquire