SCHEDULE 13G 0001890802 XXXXXXXX LIVE Common Shares, par value $0.01 12/11/2025 0001951067 C3is Inc. Y18284169 331 Kifissias Avenue, Kifissia14561 Athens J3 14561 Rule 13d-1(c) S.H.N. Financial Investments Ltd. L3 443213.00 0.00 443213.00 0.00 443213.00 N 9.99 FI C3is Inc. 331 Kifissias Avenue, Kifissia14561 Athens, Greece, 14561 S.H.N. Financial Investments Ltd. Herzliya Hills Arik Einstein 3, Israel, 4610301 Israel Y 443,213 The amounts in Row (5), (7) and (9) represent 425,000 Common Shares and 18,213 Pre-Funded Warrants to purchase Common Shares. The amounts do not include 1,431,787 Pre-Funded Warrants to purchase Common Shares, 1,875,000 Series D Warrants to purchase Common Shares and 1,875,000 Series E Warrants to purchase Common Shares, each of which are subject to a 9.99% beneficial ownership limitation. The percentage set forth on Row (11) of the cover page for the reporting person is based on 4,418,378 Common Shares outstanding after the offering (assuming no exercise of the Pre-Funded Warrants, Class D Warrants or Class E Warrants issued in the offering), based on the Issuer's Prospectus filed under Rule 424(b)(4) with the Securities and Exchange Commission on December 11, 2025. Nir Shamir is the Chief Executive Officer of the Reporting Person. As such, Mr. Shamir may be deemed to beneficially own (as that term is defined in Rule 13d-3 under the Securities Exchange Act of 1934) the securities described herein. To the extent Mr. Shamir is deemed to beneficially own such securities, Mr. Shamir disclaims beneficial ownership of these securities for all other purposes. 9.99% 443,213 0 443,213 0 Y Y 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. S.H.N. Financial Investments Ltd. /s/ Nir Shamir 12/18/2025