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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 ; TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from FORM 10 - K Delaware ( State or other jurisdiction of incorporation or organization ) 680 Andersen Drive , 5th Floor , Pittsburgh , PA ( Address of principal executive offices ) Title of each class Common Stock , par value $ 0.01 per share Large Accelerated Filer Non - accelerated filer or MONTAUK RENEWABLES , INC . ( Exact name of registrant as specified in its charter ) to Commission File No. 001-39919 Registrant's telephone number , including area code : ( 412 ) 747-8700 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol MNTK Securities registered pursuant to Section 12 ( g ) of the Act : None 85-3189583 ( I.R.S. Employer Identification No. ) 15220 ( Zip Code ) Name of each exchange on which registered The Nasdaq Capital Market No > No > Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes 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 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 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 Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a 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 : 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 has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No As of June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , the registrant did not have a public float because there was no established public market for the registrant's common stock . As of March 17 , 2021 , the aggregate market value of shares of common stock held by non - affiliates of the registrant was $ 577,574,415 . The number of outstanding shares of the registrant's common stock on March 17 , 2021 was 142,157,835 shares . 0 DOCUMENTS INCORPORATED BY REFERENCE The information required by Part III of this Annual Report on Form 10 - K , to the extent not set forth herein , is incorporated herein by reference from the registrant's definitive proxy statement relating to the registrant's Annual Meeting of Stockholders to be held in 2021 ( the " Proxy Statement " ) , which definitive proxy statement shall be filed with the Securities and Exchange Commission not later than 120 days after the end of the fiscal year ended December 31 , 2020 .