C3is Inc. SEC filings CISS
C3is Inc. has 320 filings in SEC EDGAR's recent list, going back to Dec 7, 2022. Its latest annual report, Form 20-F, was filed on Apr 22, 2026 for the period ended Dec 31, 2025. The most recent current report (Form 6-K) was filed on Nov 5, 2026. The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 424B3 | Prospectus | Nov 5, 2026 | — |
| 424B3 | Prospectus | Nov 5, 2026 | — |
| 424B3 | Prospectus | Nov 5, 2026 | — |
| POS AM | Filing | Oct 5, 2026 | — |
| POS AM | Filing | Oct 5, 2026 | — |
| POS AM | Filing | Oct 5, 2026 | — |
| 424B3 | Prospectus | Aug 27, 2026 | — |
| 424B3 | Prospectus | Aug 27, 2026 | — |
| 424B3 | Prospectus | Aug 27, 2026 | — |
| 424B3 | Prospectus | Aug 27, 2026 | — |
| 424B3 | Prospectus | Aug 27, 2026 | — |
| 424B3 | Prospectus | Aug 19, 2026 | — |
| 424B3 | Prospectus | Aug 19, 2026 | — |
| 424B3 | Prospectus | Aug 19, 2026 | — |
| 424B3 | Prospectus | Aug 19, 2026 | — |
| 424B3 | Prospectus | Aug 19, 2026 | — |
| 424B3 | Prospectus | Jul 28, 2026 | — |
| 424B3 | Prospectus | Jul 28, 2026 | — |
| 424B3 | Prospectus | Jul 28, 2026 | — |
| 424B3 | Prospectus | Jul 28, 2026 | — |
| 424B3 | Prospectus | Jul 28, 2026 | — |
| 424B3 | Prospectus | Jul 28, 2026 | — |
| 424B4 | Prospectus | Jul 28, 2026 | — |
| F-1/A | Filing | Jul 23, 2026 | — |
| F-1 | Registration statement (foreign issuer) | Jul 22, 2026 | — |
| 424B3 | Prospectus | May 18, 2026 | — |
| 424B3 | Prospectus | May 18, 2026 | — |
| 424B3 | Prospectus | May 18, 2026 | — |
| 424B3 | Prospectus | May 18, 2026 | — |
| POS AM | Filing | May 5, 2026 | — |
| POS AM | Filing | May 5, 2026 | — |
| POS AM | Filing | May 5, 2026 | — |
| POS AM | Filing | May 5, 2026 | — |
| 424B3 | Prospectus | Feb 25, 2026 | — |
| 424B3 | Prospectus | Feb 25, 2026 | — |
| 424B3 | Prospectus | Feb 25, 2026 | — |
| 424B3 | Prospectus | Feb 25, 2026 | — |
| 424B5 | Prospectus supplement | Feb 25, 2026 | — |
| 424B3 | Prospectus | Feb 19, 2026 | — |
| 424B3 | Prospectus | Feb 19, 2026 | — |
| 424B3 | Prospectus | Feb 19, 2026 | — |
| 424B3 | Prospectus | Feb 19, 2026 | — |
| 424B3 | Prospectus | Jan 26, 2026 | — |
| 424B3 | Prospectus | Jan 26, 2026 | — |
| 424B3 | Prospectus | Jan 26, 2026 | — |
| 424B3 | Prospectus | Jan 26, 2026 | — |
| 424B3 | Prospectus | Jan 22, 2026 | — |
| 424B3 | Prospectus | Jan 22, 2026 | — |
| 424B3 | Prospectus | Jan 22, 2026 | — |
| 424B3 | Prospectus | Jan 22, 2026 | — |
| 424B3 | Prospectus | Jan 20, 2026 | — |
| 424B3 | Prospectus | Jan 20, 2026 | — |
| 424B3 | Prospectus | Jan 20, 2026 | — |
| 424B3 | Prospectus | Jan 20, 2026 | — |
| 424B3 | Prospectus | Dec 19, 2025 | — |
| 424B3 | Prospectus | Dec 19, 2025 | — |
| 424B3 | Prospectus | Dec 19, 2025 | — |
| 424B3 | Prospectus | Dec 19, 2025 | — |
| POS AM | Filing | Dec 15, 2025 | — |
| POS AM | Filing | Dec 15, 2025 | — |
| POS AM | Filing | Dec 15, 2025 | — |
| 424B4 | Prospectus | Dec 11, 2025 | — |
| F-1/A | Filing | Dec 5, 2025 | — |
| F-1/A | Filing | Nov 3, 2025 | — |
| 424B5 | Prospectus supplement | Oct 9, 2025 | — |
| POS AM | Filing | Oct 1, 2025 | — |
| POS AM | Filing | Oct 1, 2025 | — |
| POS AM | Filing | Oct 1, 2025 | — |
| F-1 | Registration statement (foreign issuer) | Sep 3, 2025 | — |
| 424B3 | Prospectus | Sep 2, 2025 | — |
| 424B3 | Prospectus | Sep 2, 2025 | — |
| 424B3 | Prospectus | Sep 2, 2025 | — |
| 424B3 | Prospectus | May 16, 2025 | — |
| 424B3 | Prospectus | May 16, 2025 | — |
| 424B3 | Prospectus | May 16, 2025 | — |
| POS AM | Filing | Apr 30, 2025 | — |
| POS AM | Filing | Apr 30, 2025 | — |
| POS AM | Filing | Apr 30, 2025 | — |
| 424B3 | Prospectus | Apr 4, 2025 | — |
| 424B3 | Prospectus | Apr 4, 2025 | — |
| 424B3 | Prospectus | Apr 4, 2025 | — |
| 424B3 | Prospectus | Apr 2, 2025 | — |
| 424B3 | Prospectus | Apr 2, 2025 | — |
| 424B3 | Prospectus | Apr 2, 2025 | — |
| 424B3 | Prospectus | Mar 12, 2025 | — |
| 424B3 | Prospectus | Mar 12, 2025 | — |
| 424B3 | Prospectus | Mar 12, 2025 | — |
| F-3 | Shelf registration (foreign issuer) | Feb 21, 2025 | — |
| 424B3 | Prospectus | Jan 2, 2025 | — |
| 424B3 | Prospectus | Jan 2, 2025 | — |
| 424B3 | Prospectus | Jan 2, 2025 | — |
| POS AM | Filing | Dec 10, 2024 | — |
| POS AM | Filing | Dec 10, 2024 | — |
| POS AM | Filing | Dec 10, 2024 | — |
| 424B3 | Prospectus | Nov 19, 2024 | — |
| 424B3 | Prospectus | Nov 19, 2024 | — |
| 424B3 | Prospectus | Nov 19, 2024 | — |
| 424B3 | Prospectus | Sep 30, 2024 | — |
| 424B3 | Prospectus | Sep 30, 2024 | — |
| 424B3 | Prospectus | Sep 30, 2024 | — |
| 424B3 | Prospectus | May 28, 2024 | — |
| 424B3 | Prospectus | May 28, 2024 | — |
| 424B3 | Prospectus | May 28, 2024 | — |
| POS AM | Filing | May 1, 2024 | — |
| POS AM | Filing | May 1, 2024 | — |
| POS AM | Filing | May 1, 2024 | — |
| 424B3 | Prospectus | Apr 12, 2024 | — |
| 424B3 | Prospectus | Apr 12, 2024 | — |
| 424B3 | Prospectus | Apr 12, 2024 | — |
| 424B3 | Prospectus | Apr 12, 2024 | — |
| 424B3 | Prospectus | Apr 12, 2024 | — |
| 424B3 | Prospectus | Apr 12, 2024 | — |
| 424B3 | Prospectus | Mar 26, 2024 | — |
| 424B3 | Prospectus | Mar 26, 2024 | — |
| 424B3 | Prospectus | Mar 26, 2024 | — |
| 424B3 | Prospectus | Mar 19, 2024 | — |
| 424B3 | Prospectus | Mar 19, 2024 | — |
| 424B3 | Prospectus | Mar 19, 2024 | — |
| 424B3 | Prospectus | Mar 15, 2024 | — |
| 424B3 | Prospectus | Mar 15, 2024 | — |
| 424B3 | Prospectus | Mar 15, 2024 | — |
| 424B4 | Prospectus | Mar 15, 2024 | — |
| F-1/A | Filing | Feb 23, 2024 | — |
| 424B3 | Prospectus | Feb 22, 2024 | — |
| 424B3 | Prospectus | Feb 22, 2024 | — |
| F-1 | Registration statement (foreign issuer) | Feb 5, 2024 | — |
| 424B3 | Prospectus | Jan 23, 2024 | — |
| 424B4 | Prospectus | Jan 22, 2024 | — |
| F-1MEF | Filing | Jan 19, 2024 | — |
| F-1 | Registration statement (foreign issuer) | Jan 8, 2024 | — |
| 424B3 | Prospectus | Nov 6, 2023 | — |
| 424B3 | Prospectus | Sep 29, 2023 | — |
| 424B3 | Prospectus | Aug 25, 2023 | — |
| S-8 | Employee stock plan registration | Jul 18, 2023 | — |
| 424B3 | Prospectus | Jul 17, 2023 | — |
| 424B3 | Prospectus | Jul 5, 2023 | — |
| 424B4 | Prospectus | Jul 3, 2023 | — |
| F-1 | Registration statement (foreign issuer) | Jun 26, 2023 | — |
| 424B1 | Filing | Jun 12, 2023 | — |
| F-1/A | Filing | Jun 6, 2023 | — |
| F-1/A | Filing | May 17, 2023 | — |
| F-1 | Registration statement (foreign issuer) | Apr 12, 2023 | — |
Showing 142 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Deep Sea Foreign Transportation of Freight (SIC 4412)
- Listed as
- CISS (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- Marshall Islands
- Headquarters
- Athens, Greece
- SEC filer status
- Non-accelerated filer, Emerging growth company
- SEC CIK
- 1951067
Other Deep Sea Foreign Transportation of Freight companies
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- DHT Holdings, Inc. DHT
- Okeanis Eco Tankers Corp. ECO
- ZIM Integrated Shipping Services Ltd. ZIM
- Star Bulk Carriers Corp. SBLK
Source: SEC EDGAR filings. This is company-reported data, not investment advice.