AAON, INC. — Director's Dealing 2012

May 16, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AAON INC (AAON)
CIK: 0000824142
Period of Report: 2012-05-15

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

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-15	Stock Option	$19.47	A	1	Acquired	2022-05-15	Common Stock (10000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $.004	2250	Direct
Common Stock, par value $.004	12406	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option	$9.68	2013-02-21	Common Stock (22500)	1	Direct
Stock Option	$10.82	2015-04-06	Common Stock (11250)	1	Direct
Stock Option	$18.43	2016-05-08	Common Stock (22500)	1	Direct
Stock Option	$16.96	2018-03-10	Common Stock (4500)	1	Direct
Stock Option	$15.31	2019-03-09	Common Stock (7500)	1	Direct
Stock Option	$23.27	2020-05-25	Common Stock (15000)	1	Direct