Latest Period
Q1 2026
Security Snapshot
C3is Inc. - Common Stock, par value $0.01 per share (CISS) Institutional Ownership
CUSIP: Y18284177
13F Institutional Holders and Ownership History for Q1 2026
Institutions Reporting
3
Shares (Excl. Options)
88,463
Price
$0.83
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- Security type / class
- Equity / Common Stock, par value $0.01 per share
- Symbol
- CISS on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 88,463
- Total 13F value
- $72,876
- Portfolio coverage rank
- 0%
- Share change
- +88,463
- Value change
- +$72,876
- Number of holders
- 3
- Shares outstanding
- 1,080,308
- SEC-reported price per share
- $0.82
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
2 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- CISS - C3is Inc. - Common Stock, par value $0.01 per share is tracked under CUSIP Y18284177.
- 3 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Latest quarter on this page is Q1 2026.
- Additional quarter-over-quarter change detail appears as history expands.
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 Form 13F
Open SEC evidence
Latest holder context comes from 3 institutions filings for Q1 2026.
Security key
Y18284177
Latest holder period
Q1 2026
13F holders
3
13D/G owners
3
CIK / CUSIP context first
Open Q1 2026 holders
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 Y18284177:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
CISS
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Imperial Petroleum Inc./Marshall Islands | 82% | 9,913,422 | Imperial Petroleum Inc. | 02 Feb 2026 | ||||
| Ayrton Capital LLC | 10% | 856,228 | Ayrton Capital LLC | 31 Dec 2025 | ||||
| Alta Partners LLC | 5.2% | $80,893 | 56,176 | Alta Partners LLC | 27 Feb 2026 |
As of 31 Mar 2026, 3 institutional investors reported holding 88,463 shares of C3is Inc. - Common Stock, par value $0.01 per share (CISS). This represents 8.2% of the company’s total 1,080,308 outstanding shares.
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
1
Latest
Q1 2026
Rows shown
1-1 of 1
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 88,463 | $72,876 | +$72,876 | $0.83 | 3 |