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Table of Contents 0 ( Mark One ) . ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES ACT OF 1934 For the fiscal year ended April 30 , 2021 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-1678 BUTLER NATIONAL CORPORATION ( Exact name of Registrant as specified in its charter ) Kansas ( State of Incorporation ) Title of each class None FORM 10 - K Large accelerated filer 19920 West 161st Street , Olathe , Kansas 66062 ( Address of principal executive office ) ( Zip Code ) Registrant's telephone number , including area code : ( 913 ) 780-9595 inSecurities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) . Accelerated filer 41-0834293 ( I.R.S. Employer Identification No. ) None Securities registered pursuant to Section 12 ( g ) of the Act : Common Stock $ .01 Par Value ( Title of Class ) Indicate by check 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 Section 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 , 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 every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) : Yes > No Name of each exchange on which registered None Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , ” and “ emerging growth company " in Rule 12b 2 of the Exchange Act . Non - accelerated filer Smaller Reporting Company Emerging Growth Company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No The aggregate market value of the voting stock and non - voting common equity held by non - affiliates computed by reference to the price at which the common equity was last sold as of the last business day of the Registrant's most recently completed second fiscal quarter was approximately $ 27,020,426 at October 31 , 2020 , when the closing price of such stock was $ 0.47 . The number of shares outstanding of the registrant's common stock , $ 0.01 par value , as of July 9 , 2021 , was 75,366,749 shares . DOCUMENTS INCORPORATED BY REFERENCE : Portions of the definitive proxy statement to be filed within 120 days of April 30 , 2021 , pursuant to Regulation 14A under the Securities Exchange Act of 1934 for the Annual Meeting of Shareholders to be held on September 28 , 2021 , have been incorporated by reference into Part III of this Form 10 - K .