X0101 EFFECT 33 LIVE 2012-04-20 0001193125-12-168431 485APOS 0001126087 MET INVESTORS SERIES TRUST 333-48456 S000036840 Invesco Balanced-Risk Allocation Portfolio C000112664 Class B S000036841 JPMorgan Global Active Allocation Portfolio C000112668 Class B S000036842 Schroders Global Multi-Asset Portfolio C000112671 Class B