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. exit filing: Evergreen Capital Management LLC reports it no longer beneficially owns more than five percent of C3is common stock, reporting beneficial ownership of 27,746 shares representing 4.99%. The percentage is calculated on 528,305 shares outstanding as of April 27, 2026.
The reporting person holds Series D Warrants exercisable for up to 46,719 shares, but the cover-page counts only warrants for 27,746 shares and excludes 18,973 shares that are not issuable due to a 4.99% beneficial ownership limitation. This Amendment No. 2 constitutes an exit filing.
Imperial Petroleum Inc. filed Amendment No. 10 to its Schedule 13D, updating its beneficial ownership in C3is Inc.. The company reports beneficial ownership of 4,994,672 shares of common stock, representing 90.2% of the class.
The update reflects changes in the conversion price of C3is’s 5.0% Series A Cumulative Convertible Perpetual Preferred Stock to $3.0032 after a 1-for-7 reverse stock split of the common stock effective April 27, 2026 and related warrant price adjustments. Imperial Petroleum states it may buy more, hold, or sell C3is shares over time based on business, market, and strategic factors.
C3is Inc. files a Post-Effective Amendment to its Form F-1 to cover up to 186,880 common shares issuable upon exercise of outstanding Class D Warrants and up to 41 common shares issuable upon exercise of outstanding Class E Warrants.
The amendment incorporates the Company’s Annual Report on Form 20-F filed April 22, 2026 and limits the registration to the remaining warrant exercises from the December 12, 2025 registered public offering. The Class D Warrants carry an exercise price of $48.16 per share and expire on December 12, 2030; the Class E Warrants have an exercise price of $0.0014 and do not expire. The prospectus states the last reported Nasdaq sale price was $3.30 on May 1, 2026.
C3is Inc. files Post-Effective Amendment No. 6 to its Form F-1 to incorporate by reference its Annual Report on Form 20-F filed April 22, 2026 and to register the issuance of common shares upon exercise of outstanding Class C-1 and Class C-2 warrants. This prospectus covers up to $5,687,550 of common shares issuable upon exercise of outstanding Class C-1 Warrants (aggregate exercise price $38,439) and Class C-2 Warrants (aggregate exercise price $5,649,111), which, on a split-adjusted basis, are exercisable for an aggregate of 12,801 and 1,881,040 shares, respectively, at an exercise price of $3.0032 per share. Each warrant expires on March 19, 2029. The prospectus states estimated net cash proceeds if exercised on a cash basis and that proceeds may be used for vessel acquisitions and general corporate purposes.
C3is Inc. filed Post-Effective Amendment No. 6 to a Form F-1 prospectus to register common shares issuable upon exercise of outstanding Class B-1 and Class B-2 warrants. The prospectus covers up to $6,988,593 of common shares (aggregate exercise price), including $159,580 attributable to Class B-1 Warrants and $6,829,013 attributable to Class B-2 Warrants.
The Class B-1 and Class B-2 Warrants each have an exercise price of $3.0032 per share and expire on January 23, 2029. As of April 30, 2026, the warrants are exercisable for an aggregate of 53,142 and 2,273,919 shares, respectively. Shares outstanding would be 2,868,149 assuming cash exercise of all Class B-1 and B-2 Warrants at the current exercise price.
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.