UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 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 47-2564547 (State or Other Jurisdi ...

Exhibit 99.1 PRESS RELEASE SEACOR MARINE ANNOUNCES FIRST QUARTER 2024 RESULTS Houston, Texas May 1, 2024 FOR IMMEDIATE RELEASE - SEACOR Marine Holdings Inc. (NYSE: SMHI) (the “Company” or “SEACOR Marine”), a leading provider of marine and support transportation services to offshore energy facilities worldwide, today announced results for its first quarter ended March 31, 2024. SEACOR Marine’s consolidated operating revenues for the first quarter of 2024 were $62.8 million, operating loss was $10.6 million, ...

Exhibit 99.1 PRESS RELEASE SEACOR MARINE ANNOUNCES FOURTH QUARTER 2023 RESULTS Houston, Texas February 29, 2024 FOR IMMEDIATE RELEASE - SEACOR Marine Holdings Inc. (NYSE: SMHI) (the “Company” or “SEACOR Marine”), a leading provider of marine and support transportation services to offshore energy facilities worldwide, today announced results for its fourth quarter ended December 31, 2023. SEACOR Marine’s consolidated operating revenues for the fourth quarter of 2023 were $73.1 million, operating income was $ ...

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K 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, 2023 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 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 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 47-2564547 (State or Other Jur ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 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 47-2564547 (State or Other Jurisdic ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 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 47-2564547 (State or Other Jurisdi ...

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K 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, 2022 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 ...