C3IS INC CISS
COM · Common Stock · CUSIP Y18284300
- SectorIndustrials
- IndustryDeep Sea Foreign Transportation of Freight
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $1.65.
Biggest buyers
| TOWERVIEW LLC | New | +50.0k |
| HRT FINANCIAL LP | New | +24.5k |
| Integrated Wealth Concepts LLC | New | +5 |
| Caitong International Asset Management Co., Ltd | New | +2 |
Biggest sellers
| None |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
Imperial Petroleum Inc./Marshall Islands
13D · may seek influence
-14.1 pts · filed 2026-07-30
Stated purposeThe Reporting Person involved in the securities described in this Schedule 13D in connection with the Spin-Off Distribution, and intends to review its investment in the Issuer on a continuing basis. The Reporting Person may from time to time acquire additional securities of the Issuer, or retain or sell all or portion of the shares then held by the Reporting Person, in the open market, block trades, underwritten public offerings or privately negotiated transactions. Any actions the Reporting Person might undertake with respect to its investment in the Issuer may be made at any time and from time to time and will be dependent upon the Reporting Person's review of numerous factors, including, but not limited to: ongoing evaluation of the Issuer's business, financial condition, operations, pr… Full filing |
68.8% |
| Lind Global Fund III LP 13G · passive investor new · filed 2026-07-31 | 10.0% |
| CVI Investments, Inc. 13G · passive investor new · filed 2026-08-03 | 9.9% |
| HORNE TIMOTHY P 13G · passive investor new · filed 2026-09-03 | 9.1% |
| Alta Partners LLC 13G · passive investor filed 2026-08-03 | 8.2% |
| JANE STREET GROUP, LLC 13G · passive investor new · filed 2026-08-19 | 7.2% |
| WEXFORD CAPITAL LP 13G · passive investor -3.2 pts · filed 2025-09-29 | 7.0% |
Fell to 5% or below in the last year: Ascent Partners Fund LLC (0.0%, 2026-10-05), TOWERVIEW LLC (—, 2026-10-02), Evergreen Capital Management LLC/NV (4.9%, 2026-05-11)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| TOWERVIEW LLC 0.05% of their portfolio | 50.0k $83.0k | New |
| HRT FINANCIAL LP 0.00% of their portfolio | 24.5k $40.0k | New |
| Integrated Wealth Concepts LLC 0.00% of their portfolio | 5 $8 | New |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 2 $3 | New |