RUBI · Rubico Inc.
Market Cap
$3.06M
Shares
1.79M
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 3
Total Value: $207,908
Total Shares: 38,289
Institutional Ownership Trend
4 quarters
Holder Concentration
Across 3 13F filers · Δ vs Mar 31, 2026Top Holder
78.4%
+8.5 pts
Top 5
100.0%
0.0 pts
Top 10
100.0%
0.0 pts
HHI
6,599
Highly concentrated+1,227
Quarterly Activity
vs Mar 31, 2026
New
2
Increased
1
Decreased
0
Sold Out
4
Unchanged
0
Holder count:
-2
Institutional value:
+947.9%
Shares held:
-7.6%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega UBS Group AG | +8,193 | 8,211 |
Top Sellers
vs Mar 31, 2026No qualifying movers this quarter.
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mid Cable Car Capital, LP | 30,000 | $162,900 | |
| Mega ROYAL BANK OF CANADA | 78 | $423 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega JANE STREET GROUP, LLC | 116 | $13,862 | |
| Mid Tower Research Capital LLC (TRC) | 32 | $3,857 | |
| Mega CITIGROUP INC | 0 | $14 | |
| Mid SBI Securities Co., Ltd. | 0 | $0 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mid Cable Car Capital, LP | $162,900 | 78.35% | 30,000 | Shares | 2026-08-14 | |
| Mega UBS Group AG | $44,585 | 21.44% | 8,211 | Shares | 2026-08-13 | |
| Mega ROYAL BANK OF CANADA Bank | $423 | 0.20% | 78 | Shares | 2026-08-14 |