ASGN Inc — Director's Dealing 2012

Feb 28, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON ASSIGNMENT INC (ASGN)
CIK: 0000890564
Period of Report: 2012-02-24

Reporting Person: McGrath Emmett (Pres, Life Sciences &Allied HC)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-24	Common Stock	M	4089	$4.97	Acquired	121114	Direct
2012-02-24	Common Stock	S	4089	$13.9913	Disposed	117025	Direct
2012-02-24	Common Stock	M	13911	$4.96	Acquired	130936	Direct
2012-02-24	Common Stock	S	13911	$13.9913	Disposed	117025	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-24	Non-Qualified Stock Option (right to buy)	$4.96	M	13911	Disposed	2014-12-10	Common Stock (13911)	Direct
2012-02-24	Non-Qualified Stock Option (right to buy)	$4.97	M	4089	Disposed	2014-08-30	Common Stock (4089)	Direct

Footnotes

F1: These options vest one-fourth of the total number of shares on August 30, 2005, and one forty-eighth of such amount with respect to each month thereafter.