Quick Takeaways
- Athanasios Tsiakmakis filed SCHEDULE 13G/A for C3is Inc. Common Stock, par value $0.01 per share (CISS).
- Disclosed ownership: 5%.
- Date of event: 09 Jan 2026.
Athanasios Tsiakmakis - 09 Jan 2026 SCHEDULE 13G/A Report for C3is Inc. Common Stock, par value $0.01 per share (CISS)
- Filing Manager
- Athanasios Tsiakmakis
- Reporting Manager
- Athanasios Tsiakmakis
- Symbol
- CISS
- Shares outstanding
- 7,968,127 shares
- Disclosed Ownership
- 400,000 shares
- Ownership
- 5%
- Form type
- SCHEDULE 13G/A
- Filing time
- 13 Jan 2026, 16:30:09 UTC
- Date of event
- 09 Jan 2026
- Previous filing
- 28 Oct 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Athanasios Tsiakmakis disclosed 5% ownership in C3is Inc. Common Stock, par value $0.01 per share (CISS) on 09 Jan 2026."
What Changed
- Previous schedule filing date: 28 Oct 2025.
- Current filing was accepted on 13 Jan 2026, 16:30.
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 |
|---|---|---|---|---|---|---|---|
| Athanasios Tsiakmakis | 5% | 400,000 | 400,000 | 0 | /s/ Athanasios Tsiakmakis | Athanasios Tsiakmakis |