X0407 4 2023-06-05 0 0001690334 SEACOR Marine Holdings Inc. SMHI 0001338856 Regan Robert Christopher C/O SEACOR MARINE HOLDINGS INC. 12121 WICKCHESTER LANE, SUITE 500 HOUSTON TX 77079 1 0 0 0 0 Common Stock 2023-06-05 4 S 0 16000 9.13 D 51022 D Common Stock 2023-06-06 4 A 0 15852 0.00 A 66874 D Common Stock 62000 I by RC Regan Trust The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.94 to $9.29, inclusive. 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 restricted stock award reported on this Form 4 will lapse on the earlier of (i) the date of the 2024 annual meeting of stockholders of the Issuer and (ii) June 6, 2024. Reporting Person's spouse is trustee. Reporting Person disclaims beneficial ownership except to the extent of his pecuniary interest. /s/ Andrew H. Everett II, Attorney-in-Fact 2023-06-07