Quick Takeaways
- Imperial Petroleum Inc./Marshall Islands filed SCHEDULE 13D/A for C3is Inc. Common Stock, par value $0.01 per share (CISS).
- Disclosed ownership: 61%.
- Date of event: 12 Dec 2025.
Imperial Petroleum Inc./Marshall Islands - 12 Dec 2025 SCHEDULE 13D/A Report for C3is Inc. Common Stock, par value $0.01 per share (CISS)
- Filing Manager
- Imperial Petroleum Inc./Marshall Islands
- Reporting Manager
- Imperial Petroleum Inc.
- Symbol
- CISS
- Shares outstanding
- 20,458,265 shares
- Disclosed Ownership
- 12,500,000 shares
- Ownership
- 61%
- Form type
- SCHEDULE 13D/A
- Filing time
- 15 Dec 2025, 06:05:17 UTC
- Date of event
- 12 Dec 2025
- Previous filing
- 10 Oct 2025
- Next filing
- 30 Dec 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Imperial Petroleum Inc./Marshall Islands disclosed 61% ownership in C3is Inc. Common Stock, par value $0.01 per share (CISS) on 12 Dec 2025."
What Changed
- Previous schedule filing date: 10 Oct 2025.
- Current filing was accepted on 15 Dec 2025, 06:05.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Imperial Petroleum Inc. | 61% | 12,500,000 | 12,500,000 | 0 | Harry N. Vafias | Chief Executive Officer | 0001876581 |