X0306 4 2018-12-21 0001690334 SEACOR Marine Holdings Inc. SMHI 0001292966 Gellert John M C/O/ SEACOR MARINE HOLDINGS INC. 7910 MAIN STREET, 2ND FLOOR HOUMA LA 70360 1 1 President and CEO Common Stock 2018-12-21 4 P 0 23000 12.10130 A 45030 I JMG Assets LLC Common Stock 90849 D Common Stock 7595 I MCG Assets LLC Common Stock 31208 I MEG Assets LLC Common Stock 95158 I JMG GST LLC The price reported in Column 4 is a weighted average price. The Common shares were purchased in separate transactions on the same day at prices ranging from $11.645 to $12.28 per share. The Reporting Person undertakes to provide Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Shares purchased at each separate price within the range set forth in this footnote. The shares reported here are indirectly owned by the Reporting Person through JMG Assets, LLC. The Reporting Person is the Manager of JMG Assets, LLC. The Reporting Person serves as the manager of MCG Assets LLC and, as such, has the power to direct the voting and disposition of the reported securities. The Reporting Person disclaims beneficial ownership except to the extent of his pecuniary interest in the securities. The Reporting Person serves as the manager of MEG Assets LLC and, as such, has the power to direct the voting and disposition of the reported securities. The Reporting Person disclaims beneficial ownership except to the extent of his pecuniary interest in the securities. The shares reported here are indirectly owned by the Reporting Person through JMG GST LLC. The Reporting Person is the Manager of JMG GST LLC. /s/ Andrew H. Everett II, Attorney-in-Fact 2018-12-21