SCHEDULE 13G/A 0001048462 XXXXXXXX LIVE 1 Common Stock, par value $0.01 per share 09/19/2025 0001951067 C3is Inc. BBG01GSFY8Z6 331 Kifissias Avenue Kifissia Athens J3 14561 Rule 13d-1(c) WEXFORD CAPITAL LP DE 0 112014 0 112014 112014 N 7.02 PN Ownership as of September 26, 2025. See Item 4(b) for additional details. Wexford GP LLC DE 0 112014 0 112014 112014 N 7.02 OO Ownership as of September 26, 2025. See Item 4(b) for additional details. Charles Davidson X1 0 112014 0 112014 112014 N 7.02 IN Ownership as of September 26, 2025. See Item 4(b) for additional details. Joseph Jacobs X1 0 112014 0 112014 112014 N 7.02 IN Ownership as of September 26, 2025. See Item 4(b) for additional details. C3is Inc. 331 Kifissias Avenue, Kifissia, Athens, Greece, 14561 Wexford Capital LP, Wexford GP LLC, Charles E. Davidson and Joseph M. Jacobs (collectively, the "Reporting Persons") are hereby jointly filing this Amendment No. 1 (the "Amendment") to the Schedule 13G filed on September 24, 2025 because such Reporting Persons may be deemed to beneficially own the securities named in Item 1 held by certain Wexford Funds (as defined below) due to certain affiliations among the Reporting Persons. This Amendment reflects new information provided by the Issuer to Wexford Capital LP with respect to its outstanding shares of Common Stock. See Item 4(b) for additional details. The address of the principal business office of the Reporting Persons is c/o Wexford Capital LP, 777 South Flagler Drive, Suite 602 East, West Palm Beach, FL 33401. Each of Wexford Capital LP and Wexford GP LLC are formed in Delaware. Each of Charles E. Davidson and Joseph M. Jacobs are United States citizens. Y The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference, and reflects the ownership of the Reporting Persons on September 26, 2025. See Item 4(b) for additional details. Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) investment manager of Wexford Focused Trading Limited ("WFT", and together with WST and WCT, the "Wexford Funds"), be deemed to own beneficially the securities held by the Wexford Funds. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Funds. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Funds. Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by the Wexford Funds. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Funds and this report shall not be deemed as an admission that they are the beneficial owners of such securities except, in the case of Davidson and Jacobs, to the extent of their respective pecuniary interests therein. The information required by Item 4(b) is set forth in Row 11 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information in Row 11 is calculated on the basis of 1,596,407 shares of Common Stock issued and outstanding, as reported by the Issuer directly to Wexford Capital on September 26, 2025, and reflects the ownership of the Reporting Persons on such date. As of the date of event that required the filing of this Schedule 13G, the Reporting Persons may have been deemed to beneficially own more than 5% of the outstanding shares of Common Stock. The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference. Y N The Wexford Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock reported herein. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. WEXFORD CAPITAL LP /s/ Mark E. Ahern 09/29/2025 Wexford GP LLC /s/ Mark E. Ahern 09/29/2025 Charles Davidson /s/ Charles E. Davidson 09/29/2025 Joseph Jacobs /s/ Joseph M. Jacobs 09/29/2025