AAON, INC. — Director's Dealing 2010

May 20, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AAON INC (AAON)
CIK: 0000824142
Period of Report: 2010-05-18

Reporting Person: SHEFFIELD KATHY I (Vice President and Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-18	Common Stock, par value $.004	M	16875	$5.72	Acquired	18375	Direct
2010-05-18	Common Stock, par value $.004	S	16875	$24.81	Disposed	1500	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $.004	8271	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option	$9.68	2013-02-21	Common Stock (15000)	1	Direct
Stock Option	$10.82	2015-04-06	Common Stock (7500)	1	Direct
Stock Option	$18.43	2016-05-08	Common Stock (15000)	1	Direct
Stock Option	$16.96	2018-03-10	Common Stock (3000)	1	Direct
Stock Option	$15.31	2019-03-09	Common Stock (5000)	1	Direct

Footnotes

F1: Shares allocated under Company's 401(k) Plan since last reported.