X0101 EFFECT 33 LIVE 2016-04-12 0001193125-16-534995 485APOS 0000770540 Natixis Funds Trust I 002-98326 S000053352 Mirova Global Sustainable Equity Fund C000167845 Class A S000053352 Mirova Global Sustainable Equity Fund C000167846 Class C S000053352 Mirova Global Sustainable Equity Fund C000167847 Class Y