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 |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 5, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 5, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 2, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 3, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Aug 28, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 19, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 4, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 3, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 3, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 31, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jul 30, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jun 24, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 18, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 11, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 6, 2026 | — |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 27, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 11, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Feb 4, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 13, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jan 8, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 30, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 18, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 17, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 28, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 10, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 10, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 2, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 1, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Sep 29, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 24, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Apr 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 14, 2025 | — |
| SC 13D/A | Amended ownership over 5% (active) | Sep 18, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jun 24, 2024 | — |
| SC 13G | Ownership over 5% (passive) | May 24, 2024 | — |
| SC 13D | Ownership over 5% (active) | May 20, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | May 1, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Mar 25, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 20, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 29, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 29, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 24, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 24, 2024 | — |
| SC 13D | Ownership over 5% (active) | Nov 16, 2023 | — |
| SC 13D | Ownership over 5% (active) | Jul 28, 2023 | — |
Showing 57 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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- Cmb.tech NV CMBT
- Scorpio Tankers Inc. STNG
- TORM plc TRMD
- 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.