Okeanis Eco Tankers Corp美股招股说明书(2025-11-20版)

OKEANIS ECO TANKERS CORP. We are offering 3,239,436 of our shares of common stock, $0.001 par value per share, or our common shares, directly toseveral investors pursuant to this prospectus supplement and the accompanying prospectus. This prospectus supplement and the accompanying prospectus may be made available in electronic format on websites orthrough other online services maintained by the placement agents or by their affiliates. Other than this prospectus supplementand the accompanying prospectus, the information on the placement agents’ websites and any information contained in anyother website maintained by the placement agents is not part of this prospectus supplement and the accompanying prospectusor the registration statement of which this prospectus supplement and the accompanying prospectus form a part, has not been The common shares of Okeanis Eco Tankers Corp., or the Company, are listed on the New York Stock Exchange, or theNYSE, under the symbol “ECO” and on the Oslo Stock Exchange, under the symbol “OET.” On November17, 2025, the lastsale price of our common shares as reported on the NYSE was $38.94 per common share. An investment in our common shares involves risks. See the section entitled “Risk Factors” beginning on pageS-7of thisprospectus supplement and page5of the accompanying prospectus and in the documents incorporated by reference herein andtherein, including our annual report onForm 20-F for the year ended December31, 2024 filed with the Securities and ExchangeCommission on March31, 2025, or our Annual Report, to read about the risks you should consider before purchasing our We have retained Fearnley Securities AS and Clarksons Securities AS (whom we refer to herein as the Placement Agents)as our exclusive placement agents in connection with this offering. The Placement Agents are not purchasing or selling any ofour common shares offered pursuant to this prospectus supplement and the accompanying prospectus, and have no commitmentto buy any of the shares. See “Plan of Distribution” beginning on page S-16 of this prospectus supplement for more We expect that delivery of our common shares being offered pursuant to this prospectus supplement will be made to theinvestors on or about November 21, 2025, subject to customary closing conditions. The following table shows per common share and total cash Placement Agent’s fees we expect to pay to the PlacementAgents in connection with the sale of the securities pursuant to this prospectus supplement and the accompanying prospectus,assuming the sale and purchase of all of the securities offered hereby to non-affiliates of the Company, and assuming that we (1)We have agreed to pay the Placement Agents a cash fee equal to 3.25% of the gross proceeds of the offering except forany purchases by certain of our affiliates. We have agreed that we may also pay up to an additional 0.25% of the grossproceeds of the offering, except for any purchases by certain of our affiliates, entirely in our discretion. In addition, wehave agreed to pay certain expenses of the Placement Agents, as discussed under “Plan of Distribution.” We have also Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of thesesecurities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Anyrepresentation to the contrary is a criminal offense. Global CoordinatorFearnley Securities ASJoint Bookrunners Fearnley Securities AS The date of this prospectus supplement is November 19, 2025 TABLE OF CONTENTS ABOUT THIS PROSPECTUS SUPPLEMENT This prospectus supplement and the accompanying base prospectus are part of a registration statementthat we filed with the Securities and Exchange Commission, or SEC, utilizing a “shelf” registration process.This document is in two parts. The first part is this prospectus supplement, which describes the specificterms of this offering and the securities offered hereby and also adds to and updates information containedin the accompanying base prospectus and the documents incorporated by reference into this prospectussupplement and the accompanying base prospectus. The second part, the accompanying base prospectus,gives more general information and disclosure about the securities we may offer from time to time, some ofwhich does not apply to this offering of common shares. When we refer to the “prospectus,” we are We have filed with the SEC a registration statement on Form F-3 (File No. 333-287032), which wasdeclared effective by the SEC on May21, 2025, under the Securities Act of 1933, as amended, or theSecurities Act, with respect to the securities offered by this prospectus. This prospectus does not contain allof the information set forth in the registration statement and the exhibits and schedules to the registrationstatement. For further information, we refer you to the registration statement and the exhibits and schedules Any st