UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934
For the month of November 2025
Commission File Number 001-41717
C3IS INC.
(Translation
of registrant’s name into English)
331 Kifissias Avenue Erithrea 14561 Athens, Greece
(Address of principal executive office)
Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
Form 20-F ☒ Form 40-F ☐
INFORMATION CONTAINED IN THIS FORM 6-K REPORT
Financial and Operating Results for the three and nine months ended September 30, 2025
Attached to this report on Form 6-K as Exhibit 99.1 is a copy of C3is Inc.’s (the
“Company”) press release, dated November 18, 2025, announcing its financial and operating results for the three and nine months ended September 30, 2025.
EXHIBIT INDEX
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| 99.1 |
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Press Release dated November 18, 2025 |
*****
Neither
C3is Inc.’s independent accountants, nor any other independent accountants, have compiled, examined, or performed any procedures with respect to the preliminary financial results for the three and nine months ended September 30, 2025 and
2024, nor have they expressed any opinion or any other form of assurance on such information, and assume no responsibility for, and disclaim any association with, the preliminary financial results.
This report on Form 6-K, including exhibit 99.1 hereto other than the section entitled “CEO
Dr. Diamantis Andriotis Commented:”, is hereby incorporated by reference into the Company’s Registration Statement
on Form S-8 (Reg. No. 333-273306) filed with the Securities and Exchange Commission on July 18, 2023 and Registration
Statement on Form F-3 (Reg. No. 333- 285135) filed with the Securities and Exchange Commission on February 21, 2025.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.
Date: November 18, 2025
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| C3IS INC. |
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| By: |
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/s/ Nina Pyndiah |
| Name: |
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Nina Pyndiah |
| Title: |
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Chief Financial Officer |
