Material Agreement, Financial Obligation (Form 8-K)

Item 1.01 Entry into a Material Definitive Agreement.

On May 20, 2026, SEACOR Marine Holdings Inc. (the "Company"), as parent guarantor, and SEACOR Marine Foreign Holdings Inc., as borrower and wholly-owned subsidiary of the Company ("SMFH"), entered into a letter agreement ("Letter Agreement") for the purposes of modifying that certain credit agreement, dated as of November 27, 2024, among the Company, SMFH, certain other wholly-owned subsidiaries of the Company, as subsidiary guarantors, an affiliate of EnTrust Global, as lender, Kroll Agency Services Limited, as facility agent, and Kroll Trustee Services Limited, as security trustee (the "2024 Credit Agreement").

The Letter Agreement provides for (i) the release to SMFH of $13.7 million (the "Release") from a restricted escrow account into which vessel sale proceeds are deposited from the sale of vessels that serve as collateral under the 2024 Credit Agreement (the "Escrow Account") and (ii) the cancellation of the $24.6 million of undrawn commitments available under Tranche B of the 2024 Credit Agreement ("Tranche B"). The Tranche B commitments were exclusively available to make a portion of the payments for the construction of two platform supply vessels ("PSVs"), each with a contract price of $41.0 million per vessel. After giving effect to the Release, the Escrow Account holds $41.0 million which will be used to fully fund the remaining PSV construction payments without the need for any additional proceeds from Tranche B. The new PSVs are expected to be delivered in the fourth quarter of 2026 and the first quarter of 2027, respectively.

The foregoing description of the Letter Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Letter Agreement, a copy of which is filed as Exhibit 10.1 hereto, and the terms of which are incorporated herein by reference.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.