ASGN Inc — Director's Dealing 2013

May 30, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON ASSIGNMENT INC (ASGN)
CIK: 0000890564
Period of Report: 2013-05-28

Reporting Person: DAMERIS PETER T (President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-28	Common Stock	M	50000	$6.68	Acquired	442748	Direct
2013-05-28	Common Stock	S	50000	$27.2671	Disposed	392748	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-28	Non-Qualified Stock Option (right to buy)	$6.68	M	50000	Disposed	2015-08-29	Common Stock (50000)	Direct

Footnotes

F1: These options vest one forty-eighth after one month from the grant date, and one forty-eighth of such amount with respect to each month thereafter.