New Positions
9 managers initiated
Top five by reported value
Oyster Enterprises II Acquisiti NGM:OYSEU
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
9 new12 added39 reduced0 exited
Total Institutional Holders
60
as of 2025-12-31
Top Holder
Magnetar Financial LLC
$13.1M
Largest QoQ Increase
Westchester Capital Management, LLC
+850,000 sh
Largest QoQ Decrease
METEORA CAPITAL, LLC
-142,293 sh
New Positions(9)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Alberta Investment Management Corp | 400,000 | +400,000 | $4.0M | +$4.0M | — |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 400,000 | +400,000 | $4.0M | +$4.0M | — |
| MYDA Advisors LLC | 199,000 | +199,000 | $2.0M | +$2.0M | — |
| UBS OCONNOR LLC | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| L1 Global Manager Pty Ltd | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| Walleye Capital LLC | 75,000 | +75,000 | $758.3K | +$758.3K | — |
| ABC ARBITRAGE SA | 25,000 | +25,000 | $252.8K | +$252.8K | — |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 23,468 | +23,468 | $237.3K | +$237.3K | — |
| Virtu Financial LLC | 10,979 | +10,979 | $111 | +$111 | — |
Added To(12)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Westchester Capital Management, LLC | 1,295,112 | +850,000 | $13.1M | +$8.6M | 191.0% |
| TORONTO DOMINION BANK | 327,000 | +302,000 | $3.3M | +$3.1M | 1208.0% |
| MILLENNIUM MANAGEMENT LLC | 630,000 | +154,998 | $6.4M | +$1.6M | 32.6% |
| Bulldog Investors, LLP | 327,096 | +112,349 | $3.3M | +$1.1M | 52.3% |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 497,500 | +100,000 | $5.0M | +$1.0M | 25.1% |
| Radcliffe Capital Management, L.P. | 623,741 | +98,631 | $6.3M | +$1.0M | 18.8% |
| WOLVERINE ASSET MANAGEMENT LLC | 235,070 | +99,273 | $2.4M | +$1.0M | 73.1% |
| Schonfeld Strategic Advisors LLC | 206,491 | +56,818 | $2.1M | +$583.3K | 38.0% |
| Karpus Management, Inc. | 673,111 | +53,394 | $6.8M | +$575.4K | 8.6% |
| Dakota Wealth Management | 42,500 | +16,800 | $428.4K | +$170.9K | 65.4% |
| MORGAN STANLEY | 87 | +67 | $877 | +$677 | 335.0% |
| GLAZER CAPITAL, LLC | 1,501,396 | +1,513 | $15.1K | +$105 | 0.1% |
Reduced(39)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| PICTON MAHONEY ASSET MANAGEMENT | 1,000,000 | 0 | $10.1M | +$10.1M | 0.0% |
| METEORA CAPITAL, LLC | 1,199,983 | -142,293 | $12.1M | -$1.4M | -10.6% |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 340,000 | -110,000 | $3.4M | -$1.1M | -24.4% |
| MIZUHO SECURITIES USA LLC | 16,690 | -95,347 | $167.1K | -$955.9K | -85.1% |
| HEIGHTS CAPITAL MANAGEMENT, INC | 50,000 | -50,000 | $505.5K | -$496.7K | -50.0% |
| Shaolin Capital Management LLC | 200,000 | -49,654 | $2.0M | -$480.0K | -19.9% |
| Clear Street Group Inc. | 200,008 | -45,942 | $2.0M | -$442.8K | -18.7% |
| Periscope Capital Inc. | 298,000 | -27,000 | $3.0M | -$251.4K | -8.3% |
| Verition Fund Management LLC | 422,615 | -14,285 | $4.3M | -$113.8K | -3.3% |
| Magnetar Financial LLC | 1,300,000 | 0 | $13.1M | +$104.0K | 0.0% |
| AQR Arbitrage LLC | 1,138,688 | 0 | $11.5M | +$102.5K | 0.0% |
| LMR Partners LLP | 1,100,000 | 0 | $11.1M | +$96.8K | 0.0% |
| D. E. Shaw & Co., Inc. | 1,252,350 | 0 | $12.7M | +$87.7K | 0.0% |
| Linden Advisors LP | 1,150,000 | 0 | $11.6M | +$80.5K | 0.0% |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 900,000 | 0 | $9.1M | +$79.2K | 0.0% |
| Hudson Bay Capital Management LP | 696,530 | 0 | $7.0M | +$48.8K | 0.0% |
| TWO SIGMA INVESTMENTS, LP | 797,500 | 0 | $8.0M | +$47.9K | 0.0% |
| MOORE CAPITAL MANAGEMENT, LP | 500,000 | 0 | $5.1M | +$44.0K | 0.0% |
| ARISTEIA CAPITAL LLC | 454,000 | 0 | $4.6M | +$40.0K | 0.0% |
| MANGROVE PARTNERS | 450,000 | 0 | $4.5M | +$39.6K | 0.0% |
| Polar Asset Management Partners Inc. | 400,000 | 0 | $4.0M | +$35.2K | 0.0% |
| Davidson Kempner Capital Management LP | 400,000 | 0 | $4.0M | +$35.2K | 0.0% |
| BERKLEY W R CORP | 475,872 | 0 | $4.8M | +$28.6K | 0.0% |
| GABELLI & Co INVESTMENT ADVISERS, INC. | 250,700 | 0 | $2.5M | +$22.1K | 0.0% |
| WHITEBOX ADVISORS LLC | 250,000 | 0 | $2.5M | +$22.0K | 0.0% |
| GOLDMAN SACHS GROUP INC | 346,312 | 0 | $3.5M | +$20.8K | 0.0% |
| Context Capital Management, LLC | 250,782 | 0 | $2.5M | +$18.3K | 0.0% |
| MMCAP International Inc. SPC | 200,000 | 0 | $2.0M | +$17.6K | 0.0% |
| GABELLI FUNDS LLC | 199,300 | 0 | $2.0M | +$17.5K | 0.0% |
| First Trust Capital Management L.P. | 150,000 | 0 | $1.5M | +$13.2K | 0.0% |
| DLD Asset Management, LP | 100,038 | -99,962 | $1.0M | -$7.8K | -50.0% |
| 683 Capital Management, LLC | 75,000 | 0 | $758.3K | +$6.6K | 0.0% |
| Alyeska Investment Group, L.P. | 25,000 | 0 | $261.3K | +$6.3K | 0.0% |
| GRITSTONE ASSET MANAGEMENT LLC | 49,429 | 0 | $499.7K | +$4.3K | 0.0% |
| DELTEC ASSET MANAGEMENT LLC | 50,000 | 0 | $504.0K | +$3.0K | 0.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 14,458 | 0 | $146.2K | +$1.0K | 0.0% |
| Warberg Asset Management LLC | 10,000 | 0 | $101.0K | +$650 | 0.0% |
| CITIGROUP INC | 3,900 | 0 | $39.4K | +$312 | 0.0% |
| Mint Tower Capital Management B.V. | 150,000 | 0 | $1.5K | +$14 | 0.0% |
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 % |
|---|---|---|---|---|
| Magnetar Financial LLC | 1,300,000 | $13.1M | 0 | 0.0% |
| Westchester Capital Management, LLC | 1,295,112 | $13.1M | +850,000 | 191.0% |
| D. E. Shaw & Co., Inc. | 1,252,350 | $12.7M | 0 | 0.0% |
| METEORA CAPITAL, LLC | 1,199,983 | $12.1M | -142,293 | -10.6% |
| Linden Advisors LP | 1,150,000 | $11.6M | 0 | 0.0% |
| AQR Arbitrage LLC | 1,138,688 | $11.5M | 0 | 0.0% |
| LMR Partners LLP | 1,100,000 | $11.1M | 0 | 0.0% |
| PICTON MAHONEY ASSET MANAGEMENT | 1,000,000 | $10.1M | 0 | 0.0% |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 900,000 | $9.1M | 0 | 0.0% |
| TWO SIGMA INVESTMENTS, LP | 797,500 | $8.0M | 0 | 0.0% |
| Hudson Bay Capital Management LP | 696,530 | $7.0M | 0 | 0.0% |
| Karpus Management, Inc. | 673,111 | $6.8M | +53,394 | 8.6% |
| MILLENNIUM MANAGEMENT LLC | 630,000 | $6.4M | +154,998 | 32.6% |
| Radcliffe Capital Management, L.P. | 623,741 | $6.3M | +98,631 | 18.8% |
| MOORE CAPITAL MANAGEMENT, LP | 500,000 | $5.1M | 0 | 0.0% |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 497,500 | $5.0M | +100,000 | 25.1% |
| BERKLEY W R CORP | 475,872 | $4.8M | 0 | 0.0% |
| ARISTEIA CAPITAL LLC | 454,000 | $4.6M | 0 | 0.0% |
| MANGROVE PARTNERS | 450,000 | $4.5M | 0 | 0.0% |
| Verition Fund Management LLC | 422,615 | $4.3M | -14,285 | -3.3% |
New & Closed Positions this quarter
Closed Positions
0 managers exited
Top five by prior-quarter value
No managers exited their positions this quarter.
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 OYSEU 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.