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United States SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K 0 ANNUAL REPORT PURSUANT TO SECTIONS 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 ( 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 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 1-37966 SEACOR Marine Holdings Inc. ( Exact name of Registrant as Specified in Its Charter ) Delaware ( State or Other Jurisdiction of Incorporation or Organization ) 12121 Wickchester Lane , Suite 500 , Houston , TX ( Address of Principal Executive Office ) Registrant's telephone number , including area code ( 346 ) 980-1700 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common stock , par value $ 0.01 per share Securities registered pursuant to Section 12 ( g ) of the Act : Trading Symbol ( s ) SMHI None ( Title of Class ) 47-2564547 ( I.R.S. Employer Identification No. ) 77079 ( Zip Code ) Name of each exchange on which registered New York Stock Exchange 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 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 , or a smaller reporting company . See definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . ( Check one ) : Large accelerated filer 0 Accelerated filer 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 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 Exchange Act ) . Yes No The aggregate market value of the voting stock of the registrant held by non - affiliates as of June 30 , 2020 was approximately $ 52.0 million based on the closing price on the New York Stock Exchange on such date . The total number of shares of Common Stock outstanding as of March 1 , 2021 was 23,416,567 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant's definitive proxy statement for its 2021 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission ( the " SEC " ) pursuant to Regulation 14A within 120 days after the end of the Registrant's last fiscal year is incorporated by reference into Part III of this Annual Report on Form 10 - K .