ASGN Inc — Director's Dealing 2013

May 6, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON ASSIGNMENT INC (ASGN)
CIK: 0000890564
Period of Report: 2013-05-02

Reporting Person: BRILL JAMES L (SVP, CAO & Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-02	Common Stock	M	40000	$11.75	Acquired	252880	Direct
2013-05-02	Common Stock	S	40000	$23.3793	Disposed	212880	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-02	Non-Qualified Stock Option (right to buy)	$11.75	M	40000	Disposed	2017-01-01	Common Stock (40000)	Direct

Footnotes

F1: One-fourth of the total number of options vest twelve months following the grant date and one forty-eighth of such amount vests thereafter on each monthly anniversary of the grant date.