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: BRILL JAMES L (SVP, CAO & Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-31	Common Stock	D	3727	$20.28	Disposed	205764	Direct
2012-12-31	Common Stock	D	5550	$20.28	Disposed	200214	Direct
2012-12-31	Common Stock	D	4827	$20.28	Disposed	195387	Direct
2012-12-31	Common Stock	A	7928	—	Acquired	203315	Direct
2012-12-31	Common Stock	D	3700	$20.28	Disposed	199615	Direct
2012-12-31	Common Stock	A	6894	—	Acquired	206509	Direct
2012-12-31	Common Stock	D	3218	$20.28	Disposed	203291	Direct
2012-12-31	Common Stock	A	5324	—	Acquired	208615	Direct
2012-12-31	Common Stock	D	2485	$20.28	Disposed	206130	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.