X0202 SCHEDULE 13D 0002042077 XXXXXXXX LIVE Common Stock, $0.01 par value 06/22/2026 true 0001690334 78413P101 SEACOR Marine Holdings Inc.

12121 WICKCHESTER LANE SUITE 500 HOUSTON TX 77079

Jorey Chernett (248) 469-8811 6222 Indianwood Tr. Bloomfield Hills MI 48301 0002042077 N Chernett Jorey PF N X1 1946963.00 0.00 1946963.00 0.00 1946963.00 N 7.19 IN Common Stock, $0.01 par value SEACOR Marine Holdings Inc. 12121 WICKCHESTER LANE SUITE 500 HOUSTON TX 77079 This Schedule 13D (this "Schedule 13D") is filed by the Reporting Person (as defined below) with respect to the Common Stock, $0.01 par value (the "Shares"), of SEACOR Marine Holdings, Inc., a Delaware corporation (the "Issuer"). The Reporting Person previously reported beneficial ownership of shares of the Issuer described herein on Schedule 13G, initially filed on December 31, 2025 (as amended, the "Schedule 13G"). This Schedule 13D represents the initial statement on Schedule 13D filed by the Reporting Person with the Securities and Exchange Commission (the "SEC") with respect to shares of the Issuer and amends and supersedes the Schedule 13G. This statement is filed by Jorey Chernett (the "Reporting Person"). The principal business address of the Reporting Person is 6222 Indianwood Trail, Bloomfield Hills, MI 48301. The Reporting Person is a private investor. The Reporting Person has not, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). The Reporting Person has not, during the last five years, been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. The Reporting Person is a citizen of the United States of America. The 1,946,963 Shares held by Mr. Chernett were acquired through private transactions using personal funds in the amount of $12,717,562. The Reporting Person purchased the Shares based on the Reporting Person's belief that the Shares, when purchased, were undervalued and represented an attractive investment opportunity. Depending upon overall market conditions, other investment opportunities available to the Reporting Person, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Person may endeavor to further increase or decrease his position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Person may deem advisable. The Reporting Person does not have any present plan or proposal which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein or such as would occur upon or in connection with completion of, or following, any of the actions discussed herein. The Reporting Person intends to review his investment in the Issuer on a continuing basis. Depending on various factors including, without limitation, the Issuer's financial position and investment strategy, the price levels of the Shares, conditions in the securities markets and general economic and industry conditions, the Reporting Person may in the future take such actions with respect to his investment in the Issuer as he deems appropriate including, without limitation, engaging in additional communications with management and the Issuer's Board of Directors, engaging in discussions with stockholders of the Issuer or other third parties about the Issuer and the Reporting Person's investment, including potential business combinations or dispositions involving the Issuer or certain of its businesses, making recommendations or proposals to the Issuer concerning changes to the capitalization, ownership structure, board structure (including board composition), potential business combinations or dispositions involving the Issuer or certain of its businesses, or suggestions for improving the Issuer's financial and/or operational performance, purchasing additional Shares, selling some or all of his Shares, engaging in short selling of or any hedging or similar transaction with respect to the Shares, including swaps and other derivative instruments, or changing his intention with respect to any and all matters referred to in Item 4 On June 22, 2026, the Reporting Person delivered a letter (the "Letter") to the Board of Directors of the Issuer (the "Board") urging the Board to explore strategic alternatives, including an outright sale of the Company or a structured monetization of its assets, to address the significant discount between the Company's current stock price and the estimated net asset value of its fleet. A copy of the Letter is filed as Exhibit 1 to this Schedule 13D and is incorporated herein by reference. The aggregate percentage of Shares beneficially owned by the Reporting Person is based upon 27,062,277 Shares outstanding as of April 24, 2026, as disclosed in the Issuer's Quarterly Report on Form 10-Q, filed with the SEC on April 29, 2026. As of the close of business on June 22, 2026, the Reporting Person beneficially owned 1,946,963 Shares. Percentage: Approximately 7.19% 1. Sole power to vote or direct vote: 1,946,963 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 1,946,963 4. Shared power to dispose or direct the disposition: 0 The transactions in the Shares by the Reporting Person during the past sixty days are set forth in more detail in Exhibit 2 attached hereto. No person other than the Reporting Person is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the Shares. Not applicable. Other than as described herein, the Reporting Person does not have any other contracts, arrangements, understandings or relationships with respect to the Issuer's securities. Exhibit 1: Letter from Jorey Chernett to the Board of Directors of SEACOR Marine Holdings, Inc., dated June 22, 2026. Exhibit 2: Transactions in the Securities Chernett Jorey /s/ Jorey Chernett 06/22/2026