X0101 EFFECT 33 LIVE 2010-07-29 12:30:00

N-1A

0001468042 Oppenheimer Corporate Bond Fund 333-160733 S000026757 Oppenheimer Investment Grade Bond Fund C000080252 A S000026757 Oppenheimer Investment Grade Bond Fund C000080253 B S000026757 Oppenheimer Investment Grade Bond Fund C000080254 C S000026757 Oppenheimer Investment Grade Bond Fund C000080255 N S000026757 Oppenheimer Investment Grade Bond Fund C000080256 Y