New Positions
1 managers initiated
Top five by reported value
Ribbon Acquisition Corp NASDAQ NMS - GLOBAL MARKET:RIBBU
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
1 new3 added20 reduced2 exited
Total Institutional Holders
24
as of 2025-12-31
Top Holder
BERKLEY W R CORP
$4.8M
Largest QoQ Increase
Westchester Capital Management, LLC
+284,734 sh
Largest QoQ Decrease
MIZUHO SECURITIES USA LLC
-569,602 sh
New Positions(1)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Westchester Capital Management, LLC | 284,734 | +284,734 | $3.0M | +$3.0M | — |
Added To(3)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 400,000 | +100,000 | $4.2M | +$1.1M | 33.3% |
| Clear Street Group Inc. | 38,978 | +27,126 | $404.6K | +$283.2K | 228.9% |
| MORGAN STANLEY | 35 | +4 | $363 | +$46 | 12.9% |
Reduced(20)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| MIZUHO SECURITIES USA LLC | 12,398 | -569,602 | $128.4K | -$5.7M | -97.9% |
| HEIGHTS CAPITAL MANAGEMENT, INC | 200,000 | -200,000 | $2.1M | -$2.0M | -50.0% |
| TWO SIGMA INVESTMENTS, LP | 54,705 | -106,877 | $567.8K | -$1.1M | -66.1% |
| TORONTO DOMINION BANK | 88,326 | -56,674 | $916.8K | -$568.0K | -39.1% |
| MANGROVE PARTNERS | 174,866 | -28,134 | $1.8M | -$263.6K | -13.8% |
| BERKLEY W R CORP | 462,604 | 0 | $4.8M | +$64.8K | 0.0% |
| Polar Asset Management Partners Inc. | 400,000 | 0 | $4.2M | +$56.0K | 0.0% |
| Karpus Management, Inc. | 218,287 | -7,000 | $2.3M | -$41.1K | -3.1% |
| Hudson Bay Capital Management LP | 250,000 | 0 | $2.6M | +$37.5K | 0.0% |
| AQR Arbitrage LLC | 186,895 | 0 | $1.9M | +$28.0K | 0.0% |
| D. E. Shaw & Co., Inc. | 150,000 | 0 | $1.6M | +$22.5K | 0.0% |
| GABELLI & Co INVESTMENT ADVISERS, INC. | 139,200 | 0 | $1.4M | +$19.5K | 0.0% |
| WHITEBOX ADVISORS LLC | 125,000 | 0 | $1.3M | +$17.5K | 0.0% |
| GABELLI FUNDS LLC | 105,800 | 0 | $1.1M | +$14.8K | 0.0% |
| GOLDMAN SACHS GROUP INC | 60,105 | 0 | $623.9K | +$8.4K | 0.0% |
| WOLVERINE ASSET MANAGEMENT LLC | 438,855 | -5,330 | $4.6M | +$6.9K | -1.2% |
| Centiva Capital, LP | 40,000 | 0 | $415.6K | +$6.0K | 0.0% |
| Dakota Wealth Management | 29,333 | 0 | $304.5K | +$4.1K | 0.0% |
| Warberg Asset Management LLC | 17,800 | 0 | $184.8K | +$2.5K | 0.0% |
| GLAZER CAPITAL, LLC | 150,095 | -39,800 | $1.6K | -$387 | -20.9% |
Sold Out(2)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| HGC Investment Management Inc. | 0 | -250,000 | $0 | -$2.6M | — |
| UBS Group AG | 0 | -5,087 | $0 | -$52.1K | — |
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
| Manager | Shares | $ Value | Δ Shares | QoQ % |
|---|---|---|---|---|
| BERKLEY W R CORP | 462,604 | $4.8M | 0 | 0.0% |
| WOLVERINE ASSET MANAGEMENT LLC | 438,855 | $4.6M | -5,330 | -1.2% |
| Polar Asset Management Partners Inc. | 400,000 | $4.2M | 0 | 0.0% |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 400,000 | $4.2M | +100,000 | 33.3% |
| Westchester Capital Management, LLC | 284,734 | $3.0M | +284,734 | — |
| Hudson Bay Capital Management LP | 250,000 | $2.6M | 0 | 0.0% |
| Karpus Management, Inc. | 218,287 | $2.3M | -7,000 | -3.1% |
| HEIGHTS CAPITAL MANAGEMENT, INC | 200,000 | $2.1M | -200,000 | -50.0% |
| AQR Arbitrage LLC | 186,895 | $1.9M | 0 | 0.0% |
| MANGROVE PARTNERS | 174,866 | $1.8M | -28,134 | -13.8% |
| D. E. Shaw & Co., Inc. | 150,000 | $1.6M | 0 | 0.0% |
| GABELLI & Co INVESTMENT ADVISERS, INC. | 139,200 | $1.4M | 0 | 0.0% |
| WHITEBOX ADVISORS LLC | 125,000 | $1.3M | 0 | 0.0% |
| GABELLI FUNDS LLC | 105,800 | $1.1M | 0 | 0.0% |
| TORONTO DOMINION BANK | 88,326 | $916.8K | -56,674 | -39.1% |
| GOLDMAN SACHS GROUP INC | 60,105 | $623.9K | 0 | 0.0% |
| TWO SIGMA INVESTMENTS, LP | 54,705 | $567.8K | -106,877 | -66.1% |
| Centiva Capital, LP | 40,000 | $415.6K | 0 | 0.0% |
| Clear Street Group Inc. | 38,978 | $404.6K | +27,126 | 228.9% |
| Dakota Wealth Management | 29,333 | $304.5K | 0 | 0.0% |
New & Closed Positions this quarter
Closed Positions
2 managers exited
Top five by prior-quarter value
- HGC Investment Management Inc.$2.6M
- UBS Group AG$52.1K
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for RIBBU against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.