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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from For the fiscal year ended December 31 , 2020 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K Title of each class Common Stock Nevada ( State or other jurisdiction of incorporation or organization ) to Commission file number : 0-18953 AAON , INC . ( Exact name of registrant as specified in its charter ) 2425 South Yukon Ave. , Tulsa , Oklahoma ( Address of principal executive offices ) ( Zip Code ) 87-0448736 ( IRS Employer Identification No. ) 74107 Registrant's telephone number , including area code : ( 918 ) 583-2266 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) AAON Name of each exchange on which registered NASDAQ Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes > No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Act . □ Yes > No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site , if any , every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S - T during the preceding 12 months ( or for such shorter period that the registrant was required to submit and post such files ) . Yes □ No