ASGN Inc — Director's Dealing 2013

Jan 3, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON ASSIGNMENT INC (ASGN)
CIK: 0000890564
Period of Report: 2012-12-31

Reporting Person: DAMERIS PETER T (President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-31	Common Stock	A	29377	—	Acquired	616515	Direct
2012-12-31	Common Stock	D	13287	$20.28	Disposed	603228	Direct
2012-12-31	Common Stock	A	72596	—	Acquired	675824	Direct
2012-12-31	Common Stock	D	33887	$20.28	Disposed	641937	Direct
2012-12-31	Common Stock	A	22686	—	Acquired	664623	Direct
2012-12-31	Common Stock	D	10589	$20.28	Disposed	654034	Direct
2012-12-31	Common Stock	A	24654	—	Acquired	678688	Direct
2012-12-31	Common Stock	D	11151	$20.28	Disposed	667537	Direct
2012-12-31	Common Stock	A	24654	—	Acquired	692191	Direct
2012-12-31	Common Stock	D	12223	$20.28	Disposed	679968	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.