X0609 4 2026-06-02 0001690334 SEACOR Marine Holdings Inc. SMHI 0001338856 Regan Robert Christopher false C/O SEACOR MARINE HOLDINGS INC. 12121 WICKCHESTER LANE, SUITE 500 HOUSTON TX 77079 true false false false false Common Stock 2026-06-02 4 A false 17235 0 A 95897 D Common Stock 48485 I by RC Regan Trust The restricted stock award reported in this Form 4 will lapse on the earlier of (i) the date of the 2027 annual meeting of stockholders of the Issuer, provided that such date is not less than 50 weeks from the grant date of such award, and (ii) June 2, 2027. 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 2026-06-04