Rubico Inc
RUBI
2 hedge funds and large institutions have $39.4K invested in Rubico Inc in 2025 Q4 according to their latest regulatory filings, with 2 funds opening new positions, increasing their positions, reducing their positions, and closing their positions.
0% more ownership
Funds ownership: 0% → 0% (+0%)
55% less capital invested
Capital invested by funds: $87.5K → $39.4K (-$48.1K)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Jane Street
New York
|
+$770K |
| 2 |
UBS Group
Zurich,
Switzerland
|
+$90.5K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SM
Sabby Management
Miami Beach,
Florida
|
-$44.2K |
| 2 |
Walleye Capital
New York
|
-$42.4K |
| 3 |
FDCDDQ
Federation des caisses Desjardins du Quebec
Levis,
Quebec, Canada
|
-$746 |
| 4 |
TRCT
Tower Research Capital (TRC)
New York
|
-$159 |
| 5 |
SS
SBI Securities
Tokyo,
Japan
|
-$32 |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
|
1
Jane Street
New York
| $34.6K | +$770K | +17 | New |
|
|
2
UBS Group
Zurich,
Switzerland
| $4.71K | +$90.5K | +2 | New |
|
|
TAM
3
Tucker Asset Management
Littleton,
Colorado
| $54 | – | – | – |
|
4
Bank of America
Charlotte,
North Carolina
| $3 | – | – | – |
|
|
FDCDDQ
5
Federation des caisses Desjardins du Quebec
Levis,
Quebec, Canada
| – | -$746 | – | – |
|
|
SM
6
Sabby Management
Miami Beach,
Florida
| – | -$44.2K | – | – |
|
|
SS
7
SBI Securities
Tokyo,
Japan
| – | -$32 | – | – |
|
|
TRCT
8
Tower Research Capital (TRC)
New York
| – | -$159 | – | – |
|
|
9
Walleye Capital
New York
| – | -$42.4K | – | – |
|
RUBI Hedge Fund Activity: Q4 2025 in Review
2 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in Rubico Inc (RUBI) for Q4 2025, worth a combined $39.4K — down 55% from $87.5K a quarter earlier.
Buyers outnumbered sellers: 2 funds opened new RUBI positions and 0 closed out — a net gain of 2 holders — while 0 added to existing stakes and 0 trimmed.
The largest buyer was Jane Street, opening a new position worth an estimated $770K. The largest seller was Sabby Management, cutting an estimated $44.2K.
- 2 institutional investors held Rubico Inc (RUBI) as of Q4 2025, up from 0 in Q3 2025.
- Funds reported $39.4K of Rubico Inc stock for Q4 2025, down 55% quarter-over-quarter.
- 2 funds opened new Rubico Inc positions in Q4 2025 and 0 closed out, a net change of +2 holders.
- The largest Rubico Inc buyer in Q4 2025 was Jane Street, an estimated $770K added.
- The largest Rubico Inc seller in Q4 2025 was Sabby Management, an estimated $44.2K sold.
Based on aggregated 13F filings for Q4 2025.