C3is Inc. filings document a foreign private issuer operating a dry bulk and tanker shipping business. Form 6-K reports provide formal records of unaudited operating and financial results, vessel acquisition agreements, charter and fleet information, and securities matters tied to the company's common shares on The Nasdaq Capital Market.
The filing record also covers capital-structure actions, including reverse stock splits, amendments to articles of incorporation, warrant exercise and adjustment provisions, Series A Convertible Preferred Stock adjustments, registered offerings and an at-the-market sales agreement. Registration-statement references and incorporated exhibits describe placement-agent agreements, prospectus supplements and share-based compensation registration matters.
C3is Inc. filed Post-Effective Amendment No. 6 to its Form F-1 to update its registration statement and to incorporate by reference its Form 20-F for the year ended December 31, 2025. This amendment relates solely to the exercise of outstanding Class A Warrants exercisable for up to 23 common shares.
The prospectus states each Class A Warrant is exercisable at an exercise price of $220,500 per share, would expire on July 5, 2028, and that the company would receive estimated net proceeds of $5,071,500 if all such warrants were exercised on a cash basis. The company reports 541,111 shares would be outstanding immediately after exercise in the illustrative calculation provided.
C3is Inc. completed a one-for-7 reverse stock split of its common shares, effective at 11:59 p.m. Eastern time on April 26, 2026. The move reduced outstanding common shares from approximately 3.8 million to approximately 528,305, with trading on a split-adjusted basis on the Nasdaq Capital Market beginning April 27, 2026 under the symbol CISS.
No fractional shares were issued; stockholders instead receive cash in lieu of any fractional share. Outstanding warrants and Series A Convertible Preferred Stock are being proportionately adjusted for share counts and exercise or conversion prices, with certain warrants also gaining an alternative zero-cash exercise exchange option tied to post-split volume weighted average pricing.
C3IS Inc. is implementing a one-for-seven reverse stock split of its common stock to help meet Nasdaq’s minimum bid price requirement and maintain its listing. The split takes effect at 11:59 pm Eastern Time on April 26, 2026, with split-adjusted trading on April 27, 2026.
Every seven issued shares will be combined into one share, keeping the $0.01 par value unchanged and reducing outstanding common shares from approximately 3.7 million to approximately 528,305. Fractional shares will not be issued; instead, affected stockholders will receive cash based on the April 24, 2026 Nasdaq closing price, adjusted for the split.
The company’s outstanding warrants and Series A Convertible Preferred Stock will be proportionately adjusted, with additional post-split adjustments for Class B and Class C Warrants. C3IS operates a fleet of five vessels totaling 260,671 dwt, expected to increase to six vessels with approximately 311,431 dwt on a pro forma basis after delivery of an additional MR product tanker.
C3is Inc., a Marshall Islands shipping company listed on Nasdaq, operates a small fleet of three handysize drybulk carriers and one Aframax tanker, with agreements to acquire two product tankers. The company was spun off from Imperial Petroleum in 2023 and received $5 million of working capital.
As of December 31, 2025, C3is had 659,668 common shares and 600,000 Series A Convertible Preferred shares outstanding, after multiple reverse stock splits between 2024 and early 2026. Its business is highly exposed to volatile drybulk and tanker charter markets, geopolitical disruptions, sanctions, trade wars and environmental regulation.
The filing highlights industry cyclicality, potential overcapacity, vessel aging, higher fuel and compliance costs, climate and ESG pressures, financing and covenant risks, concentration of customers, reliance on external management and significant macro risks, including conflicts in Ukraine and the Middle East, Houthi attacks, tariffs between the U.S. and China and evolving greenhouse gas rules.
C3is Inc. director Ioannis Kostogiannis filed an initial Form 3, which is a required report of insider holdings. The filing shows no reported purchases, sales, option exercises, gifts, or other equity transactions, indicating this is an administrative disclosure rather than a trading event.
C3is Inc. director Georgios Xiradakis filed an initial Form 3, which is a required statement of beneficial ownership for insiders. The filing reports no transactions and shows no equity transactions or derivative positions, indicating this is a baseline disclosure rather than a new trade.
C3is Inc. filed an initial insider ownership report for Pyndiah Nina Sarojini, who serves as Chief Financial Officer. This Form 3 does not list any reported transactions or derivative positions and shows no buy, sell, acquisition, or disposition activity at this time.
C3is Inc. director Harry Vafias filed an initial ownership report showing his equity stake. He directly holds 1,162 shares of common stock and indirectly holds 3,616 shares through Arethusa Properties LTD. He also has a stock option over 500 common shares at an exercise price of $348.00 per share, half of which is already vested and exercisable, with the remaining half scheduled to vest on September 16, 2026, subject to his continued service.
C3is Inc. CEO and President Adamantios Andriotis filed an initial insider ownership report on Form 3. This filing establishes his status as a director and officer of C3is Inc. The data provided shows no reported stock purchases, sales, or other equity transactions.
C3is Inc. Schedule 13G filed by Alta Partners LLC reports beneficial ownership of 56,176 shares, representing shares issuable upon exercise of warrants, equal to 5.2% of the class. The filing states sole voting and dispositive power over the 56,176 shares. The form is signed by Steven Cohen on 02/27/2026.