X0303 4 2010-02-01 0 0000890564 ON ASSIGNMENT INC ASGN 0001187618 HOLMAN JONATHAN S ON ASSIGNMENT, INC. 26651 WEST AGOURA ROAD CALABASAS CA 91302 1 0 0 0 Common Stock 2010-02-01 4 J 0 7499 0 D 13780 D Common Stock 2010-08-06 4 A 0 11071 0 A 24851 D Common Stock 2010-08-06 4 D 0 975 5.42 D 23876 D Common Stock 2010-08-06 4 D 0 1106 5.42 D 22770 D Common Stock 2010-08-06 2010-08-06 4 J 0 15500 0 D 23500 I by Trust Non-Qualified Stock Option (right to buy) 4.35 2010-05-14 4 J 0 4500 4.35 D 2003-06-17 2013-06-17 Common Stock 4500 4500 D Non-Qualified Stock Option (right to buy) 5.28 2010-05-14 4 J 0 4500 5.28 D 2004-06-15 2014-06-15 Common Stock 4500 4500 D Non-Qualified Stock Option (right to buy) 2010-05-14 4 J 0 4500 23.01 D 2001-06-07 2011-06-07 Common Stock 4500 4500 D Non-Qualified Stock Option (right to buy) 2010-05-14 4 J 0 4500 19.78 D 2002-06-18 2012-06-18 Common Stock 4500 4500 D Transfer pursuant to a qualified domestic relations order. Executive officer elected to satisfy tax withholding obligations upon vesting by having On Assignment, Inc. withhold a number of vested shares equal to that of the employee's tax liability. All options under this grant are fully vested as of the date of grant. Exercise Price is $23.01 Exercise Price is $19.78 By: Power of Attorney, James L. Brill, CFO For: Jonathan S. Holman 2010-08-11