X0202 SCHEDULE 13G/A 0000950157-25-000613 0001513017 XXXXXXXX LIVE 4 Common Stock, par value $0.0001 per share 03/31/2026 0001448397 Seanergy Maritime Holdings Corp. Y73760400 154 Vouliagmenis Avenue Glyfada J3 166 74 Rule 13d-1(c) Konstantakopoulos Konstantinos a J3 0 2203714 0 2203714 2203714 N 10.2 IN Note to Row 6: Konstantinos Konstantakopoulos owns all 2,203,714 shares indirectly through Longshaw Maritime Investments S.A., a Marshall Islands corporation. Note to Row 11: The percent ownership is calculated based upon an aggregate of 21,668,198 shares outstanding as reported in Seanergy Maritime Holdings Corp.'s Form 20-F filed on March 31, 2026. Longshaw Maritime Investments S.A. a 1T 0 2203714 0 2203714 2203714 N 10.2 CO Note to Row 6: Longshaw Maritime Investments S.A. is controlled by Konstantinos Konstantakopoulos, resulting in his indirect ownership of all 2,203,714 shares of common stock of Seanergy Maritime Holdings Corp. Note to Row 11: The percent ownership is calculated based upon an aggregate of 21,668,198 shares outstanding as reported in Seanergy Maritime Holdings Corp.'s Form 20-F filed on March 31, 2026. Seanergy Maritime Holdings Corp. 154 Vouliagmenis Avenue, Glyfada, Greece, 166 74 Konstantinos Konstantakopoulos Longshaw Maritime Investments S.A. The principal business office of each person named in Item 2(a) above is: 60 Zephyrou Street & Syngrou Avenue 17564 Athens, Greece Konstantinos Konstantakopoulos is a citizen of Greece. Longshaw Maritime Investments S.A. is a Marshall Islands Corporation. Y 1. Konstantinos Konstantakopoulos - 2,203,714 2. Longshaw Maritime Investments S.A. - 2,203,714 1. Konstantinos Konstantakopoulos - 10.2% 2. Longshaw Maritime Investments S.A. - 10.2% 0 1. Konstantinos Konstantakopoulos - 2,203,714 2. Longshaw Maritime Investments S.A. - 2,203,714 0 1. Konstantinos Konstantakopoulos - 2,203,714 2. Longshaw Maritime Investments S.A. - 2,203,714 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. Konstantakopoulos Konstantinos /s/ Konstantinos Konstantakopoulos 04/08/2026 Longshaw Maritime Investments S.A. /s/ Konstantinos Konstantakopoulos 04/08/2026