ASGN Inc — Director's Dealing 2010

Jan 5, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON ASSIGNMENT INC (ASGN)
CIK: 0000890564
Period of Report: 2010-01-02

Reporting Person: DAMERIS PETER T (Director, President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-01-02	Common Stock	D	2184	$7.15	Disposed	657979	Direct
2010-01-02	Common Stock	D	908	$7.15	Disposed	657071	Direct
2010-01-02	Common Stock	D	1046	$7.15	Disposed	656025	Direct
2010-01-02	Common Stock	D	18691	$7.15	Disposed	637334	Direct

Footnotes

F1: 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.