X0101 EFFECT 33 LIVE 2020-01-22 0001193125-19-302471 485APOS 0000710124 NORTHERN INSTITUTIONAL FUNDS 002-80543 S000001275 NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO C000003421 SHARES S000001275 NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO C000003422 SERVICE SHARES S000001275 NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO C000003423 PREMIER SHARES S000001275 NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO C000146024 Williams Capital Shares S000001286 NORTHERN INSTITUTIONAL U.S. GOVERNMENT PORTFOLIO C000003449 SHARES S000001286 NORTHERN INSTITUTIONAL U.S. GOVERNMENT PORTFOLIO C000003450 SERVICE SHARES S000001286 NORTHERN INSTITUTIONAL U.S. GOVERNMENT PORTFOLIO C000003451 PREMIER SHARES S000001288 NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO C000003455 SHARES S000001288 NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO C000003456 SERVICE SHARES S000001288 NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO C000014664 PREMIER SHARES S000001288 NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO C000146025 Williams Capital Shares S000001292 NORTHERN INSTITUTIONAL MUNICIPAL PORTFOLIO C000003463 SHARES S000001292 NORTHERN INSTITUTIONAL MUNICIPAL PORTFOLIO C000003464 SERVICE SHARES S000001292 NORTHERN INSTITUTIONAL MUNICIPAL PORTFOLIO C000014665 PREMIER SHARES S000023949 NORTHERN INSTITUTIONAL TREASURY PORTFOLIO C000070152 SHARES S000023949 NORTHERN INSTITUTIONAL TREASURY PORTFOLIO C000070153 SERVICE SHARES S000023949 NORTHERN INSTITUTIONAL TREASURY PORTFOLIO C000070154 PREMIER SHARES S000058876 Treasury Instruments Portfolio C000193056 Shares S000058876 Treasury Instruments Portfolio C000193057 Service Shares S000058876 Treasury Instruments Portfolio C000193058 Premier Shares