C3is Inc.SEC Filings
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All SEC filings by C3is Inc. (CISS) — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.
Financials
Events
| 6-K | Managements Discussion and Analysis of Financial | Sep 29, 2026 | ||
| 6-K | C3is Inc. Reports Second Quarter and Six Months 2026 Financial and Operating Results | Aug 27, 2026 | ||
| 6-K | Current report (foreign) | Aug 19, 2026 | ||
| 6-K | C3is Inc. Announces Reverse Stock Split | Aug 17, 2026 | ||
| 6-K | Current report (foreign) | Jul 28, 2026 | ||
| 6-K | Current report (foreign) | Jul 27, 2026 | ||
| 6-K | Current report (foreign) | Jul 22, 2026 | ||
| 6-K | Current report (foreign) | Jun 22, 2026 | ||
| 6-K | C3is Inc. Reports Robust Financial and Operating Results for the First Quarter of 2026, with a 358% Increase in Adjusted Net Income | May 18, 2026 | ||
| 6-K | Current report (foreign) | Apr 27, 2026 |
Registrations and Prospectuses
| POS AM | Prospectus update (post-effective amendment) | Oct 5, 2026 | ||
| POS AM | Prospectus update (post-effective amendment) | Oct 5, 2026 | ||
| POS AM | Prospectus update (post-effective amendment) | Oct 5, 2026 | ||
| 424B3 | Prospectus supplement | Aug 27, 2026 | ||
| 424B3 | Prospectus supplement | Aug 27, 2026 | ||
| 424B3 | Prospectus supplement | Aug 27, 2026 | ||
| 424B3 | Prospectus supplement | Aug 27, 2026 | ||
| 424B3 | Prospectus supplement | Aug 27, 2026 | ||
| 424B3 | Prospectus supplement | Aug 19, 2026 | ||
| 424B3 | Prospectus supplement | Aug 19, 2026 |
Proxies
No results found.
Other
| EFFECT | Notice of effectiveness | Jul 28, 2026 | ||
| EFFECT | Notice of effectiveness | May 14, 2026 | ||
| EFFECT | Notice of effectiveness | May 14, 2026 | ||
| EFFECT | Notice of effectiveness | May 14, 2026 | ||
| EFFECT | Notice of effectiveness | May 14, 2026 | ||
| EFFECT | Notice of effectiveness | Dec 19, 2025 | ||
| EFFECT | Notice of effectiveness | Dec 19, 2025 | ||
| EFFECT | Notice of effectiveness | Dec 19, 2025 | ||
| EFFECT | Notice of effectiveness | Dec 11, 2025 | ||
| EFFECT | Notice of effectiveness | Nov 24, 2025 |
Ownership
| SC 13G/A | Alta Partners Llc Updates Stake in C3is Inc. | Oct 5, 2026 | ||
| SC 13G/A | Ascent Partners Fund Llc Updates Stake in C3is Inc. | Oct 5, 2026 | ||
| SC 13G/A | Towerview Llc Updates Stake in C3is Inc. | Oct 2, 2026 | ||
| SC 13G | Horne Timothy P Acquires Stake in C3is Inc. | Sep 3, 2026 | ||
| SC 13D/A | Imperial Petroleum Inc./marshall Islands Updates Stake in C3is Inc. | Aug 28, 2026 | ||
| SC 13G | Jane Street Group, Llc Acquires 7.2% Stake in C3is Inc. | Aug 19, 2026 | ||
| SC 13G/A | L1 Capital Global Opportunities Master Fund, Ltd. Updates Stake in C3is Inc. | Aug 14, 2026 | ||
| SC 13G/A | S.h.n. Financial Investments Ltd. Updates 0.4% Stake in C3is Inc. | Aug 14, 2026 | ||
| SC 13G | Ascent Partners Fund Llc Acquires Stake in C3is Inc. | Aug 4, 2026 | ||
| SC 13G/A | Alta Partners Llc Updates Stake in C3is Inc. | Aug 3, 2026 |