Welcome to our dedicated page for C3is SEC filings (Ticker: CISS), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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., 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.
C3is Inc. entered an At-The-Market issuance sales agreement to sell up to $98 million of common shares through Aegis Capital Corp. under an existing Form F-3 registration statement, with timing and amounts determined at the company’s sole discretion.
The company stated proceeds are intended for working capital and general corporate purposes, which may include part of the purchase price for two MR product tankers the company has contracted. The Sales Agreement and legal opinion are filed as exhibits.
C3is Inc. enters an At-The-Market facility to sell up to $98 million of common shares. The Sales Agreement with Aegis Capital Corp., dated February 25, 2026, permits the company to sell shares from time to time under its effective Form F-3 registration.
The company states proceeds are intended for working capital and general corporate purposes, which may include partial payment for two MR product tankers the company has contracted or other vessel acquisitions.
C3is Inc. filed a prospectus supplement and Form 6-K announcing an At-The-Market (ATM) sales agreement permitting up to $98 million of common stock to be sold through Aegis Capital Corp. under the company’s effective Form F-3 registration statement.
The company may sell shares at its discretion and intends to use net proceeds for working capital and general corporate purposes, which may include payment toward two contracted MR product tankers or other vessel acquisitions. The offering will be made pursuant to the previously declared effective registration statement and related prospectus materials.