Latest Period
Q4 2025
Security Snapshot
C3is Inc. - Common Stock, par value $0.01 per share (CISS) Institutional Ownership
CUSIP: Y18284169
13F Institutional Holders and Ownership History from Q1 2025 to Q4 2025
Institutions Reporting
5
Shares (Excl. Options)
1,046,681
Price
$0.23
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- Type / Class
- Equity / Common Stock, par value $0.01 per share
- Symbol
- CISS on Nasdaq
- Shares outstanding
- 4,436,567
- Price per share
- $0.14
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 1,046,681
- Total reported value
- $240,733
- % of total 13F portfolios
- 0%
- Share change
- +57,686
- Value change
- +$8,842
- Number of holders
- 5
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- CISS - C3is Inc. - Common Stock, par value $0.01 per share is tracked under CUSIP Y18284169.
- 5 institutions reported positions in Q4 2025.
- 7 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 3 to 5 between Q3 2025 and Q4 2025.
- Reported value moved from $273,717 to $240,733.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 5 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP Y18284169?
CUSIP Y18284169 identifies CISS - C3is Inc. - Common Stock, par value $0.01 per share in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP Y18284169:
Significant Owners of C3is Inc. - Common Stock, par value $0.01 per share (CISS) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Imperial Petroleum Inc./Marshall Islands | 74% | +21% | $53,415,697 | +$35,040,697 | 36,337,209 | +191% | Imperial Petroleum Inc. | 29 Dec 2025 |
| L1 Capital Global Opportunities Master Fund, Ltd. | 10% | $651,523 | 443,213 | L1 Capital Global Opportunities Master Fund, Ltd. | 11 Dec 2025 | |||
| Evergreen Capital Management LLC/NV | 10% | $762,326 | 443,213 | Evergreen Capital Management LLC | 11 Dec 2025 | |||
| S.H.N. Financial Investments Ltd. | 10% | +243% | $651,523 | +$542,486 | 443,213 | +498% | S.H.N. Financial Investments Ltd. | 11 Dec 2025 |
| Athanasios Tsiakmakis | 5% | -67% | $688,000 | +$421,400 | 400,000 | +158% | Athanasios Tsiakmakis | 09 Jan 2026 |
| Flawless Management Inc. | 3.7% | -43% | $229,316 | 100,577 | 0% | Harry N. Vafias | 09 Oct 2025 | |
| Pandora Consultants II SA | 2.7% | $97,917 | 42,946 | Nikolaos Vafias | 30 Sep 2025 |
As of 31 Dec 2025, 5 institutional investors reported holding 1,046,681 shares of C3is Inc. - Common Stock, par value $0.01 per share (CISS). This represents 24% of the company’s total 4,436,567 outstanding shares.
Top 6 Institutional Shareholders
The largest institutional shareholders of C3is Inc. - Common Stock, par value $0.01 per share (CISS) together control 24% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| L1 Global Manager Pty Ltd | 19% | 861,260 | 0% | 0.13% | $198,090 |
| WEXFORD CAPITAL LP | 2.5% | 112,014 | 0% | 0.01% | $25,760 |
| CITADEL ADVISORS LLC | 1.1% | 47,635 | +260% | 0% | $10,956 |
| Sassicaia Capital Advisers LLC | 0.44% | 19,641 | 0.01% | $4,517 | |
| UBS Group AG | 0.14% | 6,131 | 0% | $1,410 | |
| FNY Investment Advisers, LLC | 0% | 0 | -100% | $0 |