EXHIBIT INDEX
| 99.1 | Management’s Discussion and Analysis of Financial Condition and Results of Operations and Consolidated Financial Statements for the Six Months Ended June 30, 2025 | |
| 101.INS | Inline XBRL Instance Document | |
| 101.SCH | Inline XBRL Taxonomy Extension Schema | |
| 101.CAL | Inline XBRL Taxonomy Extension Calculation Linkbase | |
| 101.DEF | Inline XBRL Taxonomy Extension Definition Linkbase | |
| 101.LAB | Inline XBRL Taxonomy Extension Label Linkbase | |
| 101.PRE | Inline XBRL Taxonomy Extension Presentation Linkbase | |
| 104 | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). | |
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This report on Form 6-K, including exhibit 99.1 hereto, 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, 2025
| C3IS INC. | ||
| By: | /s/ Nina Pyndiah | |
| Name: | Nina Pyndiah | |
| Title: | Chief Financial Officer | |