ASGN Inc — Director's Dealing 2012

Dec 12, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON ASSIGNMENT INC (ASGN)
CIK: 0000890564
Period of Report: 2012-12-11

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-11	Common Stock	M	5120	$4.97	Acquired	123284	Direct
2012-12-11	Common Stock	S	5120	$19.5008	Disposed	118164	Direct
2012-12-11	Common Stock	M	10382	$4.96	Acquired	128546	Direct
2012-12-11	Common Stock	S	10382	$19.5008	Disposed	118164	Direct
2012-12-11	Common Stock	M	9498	$4.96	Acquired	127662	Direct
2012-12-11	Common Stock	S	9498	$19.5008	Disposed	118164	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-12-11	Incentive Stock Option (right to buy)	$4.96	M	10382	Disposed	2014-12-10	Common Stock (10382)	Direct
2012-12-11	Incentive Stock Option (right to buy)	$4.97	M	5120	Disposed	2014-08-30	Common Stock (5120)	Direct
2012-12-11	Non-Qualified Stock Option (right to buy)	$4.96	M	9498	Disposed	2014-12-10	Common Stock (9498)	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.