CISS - Company ID 0001951067
C3is Inc. has filed 260 public company documents between 2022 and 2026. The most frequent type is 424b3 (78 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Type | Filing | Filed | Period covered | Open |
|---|---|---|---|---|
| 424B3 | 424B3 | 5mo ago2026-05-18 | - | View filing |
| 424B3 | 424B3 | 5mo ago2026-05-18 | - | View filing |
| 424B3 | 424B3 | 5mo ago2026-05-18 | - | View filing |
| 424B3 | 424B3 | 5mo ago2026-05-18 | - | View filing |
| 6-K | 6-K | 5mo ago2026-05-18 | 2026-05-18 | View filing |
| SCHEDULE 13G | SCHEDULE 13G | 5mo ago2026-05-18 | - | View filing |
| EFFECT | EFFECT | 5mo ago2026-05-13 | - | View filing |
| EFFECT | EFFECT | 5mo ago2026-05-13 | - | View filing |
| EFFECT | EFFECT | 5mo ago2026-05-13 | - | View filing |
| EFFECT | EFFECT | 5mo ago2026-05-13 | - | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 5mo ago2026-05-11 | - | View filing |
| SCHEDULE 13D/A | SCHEDULE 13D/A | 6mo ago2026-05-06 | - | View filing |
| POS AM | POS AM | 6mo ago2026-05-05 | - | View filing |
| POS AM | POS AM | 6mo ago2026-05-05 | - | View filing |
| POS AM | POS AM | 6mo ago2026-05-05 | - | View filing |
| POS AM | POS AM | 6mo ago2026-05-05 | - | View filing |
| 6-K | 6-K | 6mo ago2026-04-27 | 2026-04-27 | View filing |
| 6-K | 6-K | 6mo ago2026-04-23 | 2026-04-23 | View filing |
| 20-F | 20-F | 6mo ago2026-04-22 | 2025-12-31 | View filing |
| 3 | New insider ownership | 7mo ago2026-03-18 | 2026-03-18 | View filing |
| 3 | New insider ownership | 7mo ago2026-03-18 | 2026-03-18 | View filing |
| 3 | New insider ownership | 7mo ago2026-03-18 | 2026-03-18 | View filing |
| 3 | New insider ownership | 7mo ago2026-03-18 | 2026-03-18 | View filing |
| 3 | New insider ownership | 7mo ago2026-03-18 | 2026-03-18 | View filing |
| SCHEDULE 13G | SCHEDULE 13G | 8mo ago2026-02-27 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-25 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-25 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-25 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-25 | - | View filing |
| 6-K | 6-K | 8mo ago2026-02-25 | 2026-02-25 | View filing |
| 424B5 | Prospectus supplement | 8mo ago2026-02-25 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-19 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-19 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-19 | - | View filing |
| 424B3 | 424B3 | 8mo ago2026-02-19 | - | View filing |
| 6-K | 6-K | 8mo ago2026-02-19 | 2026-02-19 | View filing |
| SCHEDULE 13G | SCHEDULE 13G | 8mo ago2026-02-11 | - | View filing |
| SCHEDULE 13D/A | SCHEDULE 13D/A | 9mo ago2026-02-04 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-26 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-26 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-26 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-26 | - | View filing |
| 6-K | 6-K | 9mo ago2026-01-26 | 2026-01-26 | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-22 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-22 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-22 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-22 | - | View filing |
| 6-K | 6-K | 9mo ago2026-01-22 | 2026-01-22 | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-20 | - | View filing |
| 424B3 | 424B3 | 9mo ago2026-01-20 | - | View filing |