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. has filed Post-Effective Amendment No. 5 to its Form F-1 to update its prospectus for the issuance of up to $7,363,308 of common shares upon exercise of outstanding Class C-1 and Class C-2 warrants. The prior underwritten equity offering tied to this registration is already completed, and this amendment now covers only the remaining warrants issued in that offering.
The Class C-1 warrants have an aggregate exercise price of $38,439 and are currently exercisable for 12,649 common shares, while the Class C-2 warrants have an aggregate exercise price of $7,324,869 and are exercisable for 2,410,210 shares, each at $3.0391 per share, expiring on March 19, 2029. If all these warrants are exercised for cash, C3is expects 10,391,237 common shares to be outstanding.
The company estimates that full cash exercise would provide approximately $7.36 million in gross proceeds, which it plans to use for capital expenditures, including potential vessel acquisitions it has not yet identified, and for general corporate purposes. C3is operates a fleet of three drybulk carriers and one Aframax crude oil tanker totaling 213,464 dwt and qualifies as an emerging growth company, allowing it to follow reduced reporting requirements for a limited period.
C3is Inc. completed a registered sale of 7,500,000 units, raising about $9.0 million in gross proceeds before fees and expenses.
The transaction included 1,700,000 common units, each with one common share plus Class D and Class E warrants, and 5,800,000 pre‑funded units that replace the share with a pre‑funded warrant exercisable at $0.00001 per share. Class D warrants are immediately exercisable at an initial price of $1.20, then automatically reset after a 10‑trading‑day period to an Adjustment Price tied to a floor of $0.344 based on the Nasdaq Minimum Price and the lowest volume‑weighted average prices, with proportional increases in underlying shares to keep aggregate exercise value unchanged. Class E warrants are immediately exercisable at $0.00001 per share with no expiration and initially no underlying shares, but after the adjustment period they provide additional shares so each holder’s total shares reflect the unit purchase price divided by the final Adjustment Price, minus shares already received.
C3is Inc. filed a Form 6-K to furnish a press release announcing its financial and operating results for the three and nine months ended September 30, 2025. The results are described as preliminary and cover both 2025 and 2024 comparison periods.
The company notes that its independent accountants have not compiled, examined, or performed procedures on these preliminary results and provide no assurance on them. Most of the information in this Form 6-K, including Exhibit 99.1 other than the CEO commentary section, is incorporated by reference into C3is Inc.’s existing Form S-8 and Form F-3 registration statements.
C3IS Inc. (CISS) filed an amended Form F-1 for a primary offering of up to 4,672,897 Units on a best efforts basis. Each Unit includes one common share (or a pre-funded warrant in lieu of a share), one Class D Warrant, and one Class E Warrant. The company is also registering the common shares included in the Units and the shares issuable upon exercise of the pre-funded warrants and Common Warrants.
At an assumed Unit price of $2.14, the Class D Warrants are immediately exercisable and feature an automatic reset after the 10th trading day; assuming a Floor Price of $0.428, each Class D Warrant could become exercisable for five shares (up to 23,364,485 shares in aggregate). Class E Warrants are immediately exercisable at $0.00001 per share with no expiration and will adjust after the same period; on the same assumption, each Class E Warrant would be exercisable for four shares (up to 18,691,588 shares in aggregate). The maximum aggregate common shares potentially issuable upon exercise of all Class D and Class E Warrants is 42,056,073.
The offering has no minimum, will be placed by Aegis Capital Corp., and Units separate upon issuance. Beneficial ownership caps for pre-funded warrants are 4.99% or 9.99% at holder election. Common shares outstanding were 2,718,378 as of October 23, 2025.
C3is Inc. reporting persons updated their Schedule 13D to reflect dilution from recent share issuances and warrant exercises that reduced their stakes below prior thresholds. Together the three reporting parties hold 100,577 shares, representing 3.7% of the outstanding common stock. The largest holder in the group, Arethusa Properties LTD, beneficially owns 72,331 shares (2.7%), while Flawless Management Inc. reports beneficial ownership of 4 shares (0.01%). The filing notes that share counts were adjusted for multiple reverse stock splits and that the reporting persons continue to hold their positions for investment purposes; Harry N. Vafias serves as Non-Executive Chairman and may engage with management and the board on strategic matters.
Imperial Petroleum Inc. filed Amendment No. 6 to its Schedule 13D reporting beneficial ownership of 6,000,000 shares of Common Stock of C3is Inc. (symbol CISS), representing 68.8% of the class after recent issuances. The filing says the conversion price of the Issuer's Series A Convertible Preferred Stock was adjusted to $2.50 following the Issuer's registered offering and related prospectus supplement dated 10/09/2025, and that the percent ownership was updated to reflect dilution from that offering and exercise of outstanding warrants.
The statement explains Imperial Petroleum's ongoing review of its investment and reserves the right to buy, hold or sell shares by various means. It discloses that Harry N. Vafias (CEO of Imperial Petroleum) is Non-Executive Chairman of C3is and beneficially owns 100,577 shares through entities. No new transactions in the past 60 days are reported beyond the conversion-price-driven change in beneficial ownership reported here.
C3is Inc. filed a Current Report on Form 6-K that attaches a Securities Purchase Agreement, a legal opinion from Reeder & Simpson P.C., and a press release dated October 8, 2025 announcing the pricing of a $2,000,000 Registered Direct Offering. The 6-K and its exhibit are incorporated by reference into the company's Registration Statement on Form S-8 (Reg. No. 333-273306) filed July 18, 2023 and Form F-3 (Reg. No. 333-285135) filed February 21, 2025. The filing is signed by Chief Financial Officer Nina Pyndiah.
C3is Inc. completed a corporate separation from Imperial Petroleum via a June 21, 2023 spin-off and received $5,000,000 of working capital. The prospectus supplement discloses a securities offering priced at $2.50 per share for a $2,000,000 total, placement-agent fees and estimated expenses, and related warrant activity that generated aggregate proceeds of $2,043,615 including net cashless exercises. Multiple warrant classes (Class B-1, B-2, C-1, C-2) are outstanding with stated exercise prices of $3.0391 and $1.3007 (subject to adjustment), cashless-exercise mechanics, ownership thresholds (initially 4.99% up to 9.99% with notice), and various anti-dilution provisions. The filing notes two reverse stock splits (a 1-for-100 on April 11, 2024 and a 1-for-2.5 on December 31, 2024). Financial statements in the referenced Form 20-F were audited by Deloitte. Share counts are shown as approximately 74.6M to 78.1M in actual and adjusted scenarios as of June 30, 2025.
C3IS Inc. Schedule 13G/A amendment reports common stock ownership by Pandora Consultants II SA and two individuals who control that entity. Pandora Consultants II SA holds 42,940 shares, representing 2.7% of the class. Mr. Nikolaos Vafias and Ms. Theano Vafias control Pandora Consultants II SA and therefore indirectly beneficially own 42,940 shares; Nikolaos Vafias also reports 6 shares of sole voting and dispositive power, bringing his aggregate to 42,946 shares (2.7%). The filing is an amendment and lists the issuer address in Athens and CUSIP Y18284169. The reporting persons certify the shares were not acquired to influence control of the issuer.