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C3is Inc. shareholder updates 5.02% ownership stake. Athanasios Tsiakmakis filed Amendment No. 1 to a Schedule 13G/A reporting beneficial ownership of 400,000 shares of C3is Inc. common stock, representing 5.02% of the class as of an event dated 01/09/2026. The percentage is based on 7,968,378 common shares issued and outstanding as of December 12, 2025, as reported by the company. He has sole voting and dispositive power over all 400,000 shares and no shared power. The filer certifies the shares were acquired and are held without the purpose or effect of changing or influencing control of C3is Inc.
Evergreen Capital Management LLC, a U.S.-based investment firm, reported a significant ownership position in C3is Inc. common stock. As of the event date, it beneficially owned 443,213 shares of C3is Inc., representing 9.99% of the outstanding common stock. Evergreen has sole power to vote and dispose of all 443,213 shares and no shared voting or dispositive power.
The filing is made on a Schedule 13G, which is used for passive investors. Evergreen certifies that the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of C3is Inc.
C3is Inc. filed a post-effective amendment and preliminary prospectus covering the issuance of up to 3,177 common shares upon exercise of outstanding Class A warrants originally sold in a July 2023 public offering. Each Class A warrant is exercisable at $1,575.00 per share and will expire on July 5, 2028.
If all Class A warrants are exercised for cash, C3is estimates it would receive net proceeds of $5,003,775 and have 7,971,555 common shares outstanding as of September 30, 2025. The company plans to use any proceeds mainly for capital expenditures, including acquiring additional vessels that have not yet been identified, and for other general corporate purposes.
C3is, an emerging growth company incorporated in the Marshall Islands, owns a fleet of three drybulk carriers and one Aframax crude oil tanker with total capacity of 213,464 dwt. Its common stock trades on the Nasdaq Capital Market under the symbol CISS, and the last reported sale price on December 12, 2025 was $0.25 per share.
C3is Inc. filed a post-effective amendment to its Form F-1 to register the issuance of up to $7,200,427 of common shares issuable upon exercise of its outstanding Class B-1 and Class B-2 warrants. These warrants, issued in a January 2024 underwritten offering, each have an exercise price of $3.0391 per share and are currently exercisable for 52,511 and 2,316,754 common shares, respectively, through January 23, 2029.
If all Class B-1 and Class B-2 warrants are exercised for cash, C3is estimates it would receive net proceeds of approximately $159,580 and $7,040,847, and common shares outstanding would increase to 10,337,643. The company plans to use any cash proceeds for capital expenditures, including potential acquisitions of additional vessels, and for other general corporate purposes. C3is provides international seaborne transportation with three drybulk carriers and one Aframax crude oil tanker, with total carrying capacity of 213,464 dwt.
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.