Form 6-K C3is Inc. For: Jun 30
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September 29, 2026 6:06 AM EDT
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE
13a-16
OR
15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934
For the month of September 2026
Commission File Number
001-41717
(Translation of registrant’s name into English)
331 Kifissias Avenue Kifissia 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.
INFORMATION CONTAINED IN THIS FORM 6-K REPORT
Exhibit Index
*****
This report on Form 6-K, 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: September 29, 2026
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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 |
ATTACHMENTS / EXHIBITS
EX-99.1
XBRL TAXONOMY EXTENSION SCHEMA
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