C3is Inc. (CISS) — Institutional Holders, Q4 2025
5 institutional investment managers reported a CISS position on SEC Form 13F-HR for the quarter ended December 31, 2025, with a combined reported value of $240.7K. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
CISS in Q4 2025: what funds did
Funds that filed a 13F for both Q3 2025 and Q4 2025, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- CITADEL ADVISORSAdded · +34,414 sh+$7.9K
- Sassicaia Capital AdvisersNew · +19,641 sh+$4.5K
- UBS Group AGNew · +6,131 sh+$1.4K
Biggest sellers
None this quarter.
CISS 13F holders ranked 1–5 of 5
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q3 2025 |
|---|---|---|---|---|---|
| 1 | L1 Global Manager Pty Ltd#1 · 861,260 sh | 861,260 | $198.1K | — | — |
| 2 | WEXFORD CAPITAL#2 · 112,014 sh | 112,014 | $25.8K | — | 0.0% |
| 3 | CITADEL ADVISORS#3 · 47,635 sh | 47,635 | $11.0K | — | +260.3% |
| 4 | Sassicaia Capital Advisers#4 · 19,641 sh | 19,641 | $4.5K | — | New |
| 5 | UBS Group AG#5 · 6,131 sh | 6,131 | $1.4K | — | New |
Funds that sold out of CISS in Q4 2025 (1)
Held CISS at the end of Q3 2025 and filed a Q4 2025 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q3 2025 |
|---|---|---|
| FNY Investment Advisers2,500 sh | 2,500 | $5.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q4 2025. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q3 2025 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.