X0508 4 2023-09-11 0 0001690334 SEACOR Marine Holdings Inc. SMHI 0001737606 Rossmiller Gregory Scott C/O SEACOR MARINE HOLDINGS INC. 12121 WICKCHESTER LANE, SUITE 500 HOUSTON TX 77079 0 1 0 0 SVP & CAO 1 Common Stock 2023-09-11 4 S 0 602 14.00 D 202673 D Common Stock 2023-09-12 4 S 0 13236 14.03 D 189437 D The reported sale of 602 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.9974 to $14.1173, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4. The reported sale of 13,236 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2022. /s/ Andrew H. Everett II, Attorney-in-Fact 2023-09-13