CISS offering history
Every offering-related filing in C3is Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 277 filings back to Dec 7, 2022.
| Date | Filing | What it means | |
|---|---|---|---|
| Jul 28, 2026 | 424B4 → | EXECUTED | Final prospectus — offering priced (typical for IPOs and marketed share deals) |
| Jul 28, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jul 28, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jul 28, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jul 28, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jul 28, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jul 28, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jul 27, 2026 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Jul 23, 2026 | F-1/A → | REGISTERED | F-1/A registration — capacity to sell shares, not a sale yet |
| Jul 22, 2026 | F-1 → | REGISTERED | F-1 registration — capacity to sell shares, not a sale yet |
| May 18, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| May 18, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| May 18, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| May 18, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| May 13, 2026 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| May 13, 2026 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| May 13, 2026 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| May 13, 2026 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Feb 25, 2026 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 25, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 25, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 25, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 25, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 19, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 19, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 19, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 19, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 26, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 26, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 26, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 26, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 22, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 22, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 22, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 22, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 20, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 20, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 20, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jan 20, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Dec 19, 2025 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
Two honest limits. (1) A 424B takedown can price shares or notes— EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.
CISS offering FAQ
When did CISS last execute an offering?
Per SEC filings, C3is Inc.'s most recent priced offering document is a 424B4 filed 2026-07-28. Note a 424B takedown can price shares or notes (debt) — the linked document says which.
When did CISS last announce or register an offering?
The most recent registration is a F-1/A filed 2026-07-23. A registration is capacity to sell shares — not a sale.
Does an offering always mean dilution?
Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.