13F reference period
n/a
Security Snapshot
C3is Inc. - Common Shares, par value $0.01 (CISS) Institutional Ownership
CUSIP: Y18284169
13F Institutional Holders and Ownership History from Q1 2025 to Q1 2026
Institutions Reporting
Shares (Excl. Options)
n/a
Price
$0.14
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended.
Save this security page for your next review
Watchlists follow companies and investors, across their share classes. Bookmark this page to revisit this specific CUSIP and its quarterly holders. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / Common Shares, par value $0.01
- Symbol
- CISS on Nasdaq
- Shares outstanding
- 13,119,882
- SEC-reported price per share
- $0.14
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- CISS - C3is Inc. - Common Shares, par value $0.01 is tracked under CUSIP Y18284169.
- 13F reference-period holder data is not available.
- 8 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder data for the Q2 2026 reference period is not available.
- Available periods remain in the history table; they do not substitute for the headline period.
Research use
- 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.
Evidence
Source: SEC Schedule 13D/G
Open SEC evidence
Ownership context comes from Schedule 13D/G and available holder history for this CUSIP.
Security key
Y18284169
13F reference period
n/a
13F holders
13D/G owners
8
CIK / CUSIP context first
CISS full holder history
C3is Inc. SEC filings
C3is Inc. company facts
C3is Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP Y18284169:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
8
Security
CISS
| 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 |
| Evergreen Capital Management LLC/NV | 10% | $762,326 | 443,213 | Evergreen Capital Management LLC | 11 Dec 2025 | |||
| Athanasios Tsiakmakis | 5% | -67% | $688,000 | +$421,400 | 400,000 | +158% | Athanasios Tsiakmakis | 09 Jan 2026 |
| L1 Capital Global Opportunities Master Fund, Ltd. | 1.7% | -83% | $31,225 | -$30,824 | 223,038 | -50% | L1 Capital Global Opportunities Master Fund, Ltd. | 14 Aug 2026 |
| Flawless Management Inc. | 3.7% | -43% | $229,316 | 100,577 | 0% | Harry N. Vafias | 09 Oct 2025 | |
| S.H.N. Financial Investments Ltd. | 0.4% | -96% | $6,541 | -$55,509 | 46,719 | -89% | S.H.N. Financial Investments Ltd. | 14 Aug 2026 |
| Pandora Consultants II SA | 2.7% | $97,917 | 42,946 | Nikolaos Vafias | 30 Sep 2025 | |||
| TOWERVIEW LLC | 6.5% | $4,900 | 35,000 | TOWERVIEW LLC | 18 May 2026 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
5
Headline period
n/a
Rows shown
1-5 of 5