AAON Declares Dividend

TULSA, OK--(Marketwire - May 19, 2011) - AAON, INC. (NASDAQ: AAON). The Board of Directors of AAON, Inc. has declared a semi-annual cash dividend of $0.18 per share to the holders of the outstanding Common Stock of the Company as of the close of business on June 10, 2011, the record date, payable on July 1, 2011.

This press release contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933. Statements regarding future prospects and developments are based upon current expectations and involve certain risks and uncertainties that could cause actual results and developments to differ materially from the forward-looking statements.