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( Mark One ) 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 fiscal year ended December 31 , 2020 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware ( State or other jurisdiction of incorporation or organization ) FORM 10 - K For the transition period from Large accelerated filer Non - accelerated filer Title of each class Class A common stock , $ 0.0001 par value Commission file number 001-38048 Altus Midstream Company ( Exact name of registrant as specified in its charter ) to One Post Oak Central , 2000 Post Oak Boulevard , Suite 100 , Houston , Texas 77056-4400 ( Address of principal executive offices ) ( Zip Code ) Registrant's telephone number , including area code ( 713 ) 296-6000 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) ■ ■ ALTM 81-4675947 ( I.R.S. Employer Identification No. ) 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 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 ( 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 Name of each exchange on which registered Nasdaq Global Market 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 ☐ 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 Emerging growth company Aggregate market value of the voting and non - voting common equity held by non - affiliates of registrant as of June 30 , 2020 Number of shares of registrant's Class A common stock , $ 0.0001 issued and outstanding as of January 31 , 2021 Number of shares of registrant's Class C common stock , $ 0.0001 issued and outstanding as of January 31 , 2021 $ 40,944,771 3,746,460 12,500,000 Documents Incorporated By Reference Portions of registrant's proxy statement relating to registrant's 2021 annual meeting of stockholders have been incorporated by reference in Part II and Part III of this Annual Report on Form 10 - K .