X0303 5 2009-12-31 0 0 0 0000890564 ON ASSIGNMENT INC ASGN 0001301232 McGrath Emmett ON ASSIGNMENT, INC. 26651 WEST AGOURA ROAD CALABASAS CA 91302 0 1 0 0 President, Lab Support Common Stock 2009-06-11 2009-06-11 5 G 0 6778 3.87 D 141534 D Common Stock 2009-12-29 2009-12-29 5 G 0 3500 7.1 D 134528 D By: Power of Attorney, James L. Brill, CFO For: Emmett McGrath 2010-02-08