New Positions
67 managers initiated
Top five by reported value
BLRKW BLRKW
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31.
67 new0 added0 reduced0 exited
Total Institutional Holders
67
as of 2025-12-31
Top Holder
Magnetar Financial LLC
$8.0M
Largest QoQ Increase
Magnetar Financial LLC
+800,000 sh
Largest QoQ Decrease
—
New Positions(67)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Magnetar Financial LLC | 800,000 | +800,000 | $8.0M | +$8.0M | — |
| AQR Arbitrage LLC | 775,535 | +775,535 | $7.8M | +$7.8M | — |
| Linden Advisors LP | 750,000 | +750,000 | $7.5M | +$7.5M | — |
| MILLENNIUM MANAGEMENT LLC | 600,000 | +600,000 | $6.0M | +$6.0M | — |
| ARISTEIA CAPITAL LLC | 510,610 | +510,610 | $5.1M | +$5.1M | — |
| Alberta Investment Management Corp | 500,000 | +500,000 | $5.0M | +$5.0M | — |
| Polar Asset Management Partners Inc. | 500,000 | +500,000 | $5.0M | +$5.0M | — |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 500,000 | +500,000 | $5.0M | +$5.0M | — |
| PICTON MAHONEY ASSET MANAGEMENT | 500,000 | +500,000 | $5.0M | +$5.0M | — |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 450,000 | +450,000 | $4.5M | +$4.5M | — |
| Wealthspring Capital LLC | 430,100 | +430,100 | $4.3M | +$4.3M | — |
| Radcliffe Capital Management, L.P. | 400,431 | +400,431 | $4.0M | +$4.0M | — |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 400,000 | +400,000 | $4.0M | +$4.0M | — |
| LMR Partners LLP | 400,000 | +400,000 | $4.0M | +$4.0M | — |
| Ilex Capital Partners (UK) LLP | 400,000 | +400,000 | $4.0M | +$4.0M | — |
| MMCAP International Inc. SPC | 400,000 | +400,000 | $4.0M | +$4.0M | — |
| Periscope Capital Inc. | 377,800 | +377,800 | $3.8M | +$3.8M | — |
| BNP PARIBAS ARBITRAGE, SNC | 364,465 | +364,465 | $3.6M | +$3.6M | — |
| Verition Fund Management LLC | 350,000 | +350,000 | $3.5M | +$3.5M | — |
| Hudson Bay Capital Management LP | 350,000 | +350,000 | $3.5M | +$3.5M | — |
| L1 Global Manager Pty Ltd | 350,000 | +350,000 | $3.5M | +$3.5M | — |
| First Trust Capital Management L.P. | 333,042 | +333,042 | $3.3M | +$3.3M | — |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 300,000 | +300,000 | $3.0M | +$3.0M | — |
| OMERS ADMINISTRATION Corp | 300,000 | +300,000 | $3.0M | +$3.0M | — |
| KRYGER CAPITAL Ltd | 275,000 | +275,000 | $2.8M | +$2.8M | — |
| TWO SIGMA INVESTMENTS, LP | 271,875 | +271,875 | $2.7M | +$2.7M | — |
| TORONTO DOMINION BANK | 251,500 | +251,500 | $2.5M | +$2.5M | — |
| METEORA CAPITAL, LLC | 250,000 | +250,000 | $2.5M | +$2.5M | — |
| Shaolin Capital Management LLC | 250,000 | +250,000 | $2.5M | +$2.5M | — |
| Westchester Capital Management, LLC | 250,000 | +250,000 | $2.5M | +$2.5M | — |
| Context Capital Management, LLC | 250,000 | +250,000 | $2.5M | +$2.5M | — |
| Quarry LP | 225,000 | +225,000 | $2.3M | +$2.3M | — |
| WHITEBOX ADVISORS LLC | 218,525 | +218,525 | $2.2M | +$2.2M | — |
| Clear Street Group Inc. | 200,000 | +200,000 | $2.0M | +$2.0M | — |
| Lineage Point Capital LP | 150,000 | +150,000 | $1.5M | +$1.5M | — |
| MOORE CAPITAL MANAGEMENT, LP | 150,000 | +150,000 | $1.5M | +$1.5M | — |
| GRITSTONE ASSET MANAGEMENT LLC | 125,000 | +125,000 | $1.3M | +$1.3M | — |
| TIG Advisors, LLC | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| Saba Capital Management, L.P. | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| Cable Car Capital, LP | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| HEIGHTS CAPITAL MANAGEMENT, INC | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| Ghisallo Capital Management LLC | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| K2 PRINCIPAL FUND, L.P. | 100,000 | +100,000 | $1.0M | +$1.0M | — |
| BERKLEY W R CORP | 99,109 | +99,109 | $991.1K | +$991.1K | — |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | 78,850 | +78,850 | $788.5K | +$788.5K | — |
| Sandia Investment Management LP | 50,000 | +50,000 | $500.0K | +$500.0K | — |
| Bulldog Investors, LLP | 50,000 | +50,000 | $500.0K | +$500.0K | — |
| Crossingbridge Advisors, LLC | 50,000 | +50,000 | $500.0K | +$500.0K | — |
| JPMORGAN CHASE & CO | 50,000 | +50,000 | $500.0K | +$500.0K | — |
| WOLVERINE ASSET MANAGEMENT LLC | 50,000 | +50,000 | $500.0K | +$500.0K | — |
| DELTEC ASSET MANAGEMENT LLC | 50,000 | +50,000 | $500.0K | +$500.0K | — |
| ABC ARBITRAGE SA | 40,000 | +40,000 | $400.0K | +$400.0K | — |
| CANTOR FITZGERALD, L. P. | 35,000 | +35,000 | $350.0K | +$350.0K | — |
| StoneX Group Inc. | 31,740 | +31,740 | $317.4K | +$317.4K | — |
| BlueCrest Capital Management Ltd | 25,000 | +25,000 | $250.0K | +$250.0K | — |
| Stoic Point Capital Management LLC | 25,000 | +25,000 | $250.0K | +$250.0K | — |
| PRELUDE CAPITAL MANAGEMENT, LLC | 25,000 | +25,000 | $250.0K | +$250.0K | — |
| Centiva Capital, LP | 25,000 | +25,000 | $250.0K | +$250.0K | — |
| BOOTHBAY FUND MANAGEMENT, LLC | 22,313 | +22,313 | $223.1K | +$223.1K | — |
| Royal Bank of Canada | 11,000 | +11,000 | $110.0K | +$110.0K | — |
| STATE OF WISCONSIN INVESTMENT BOARD | 10,000 | +10,000 | $100.0K | +$100.0K | — |
| Mint Tower Capital Management B.V. | 650,000 | +650,000 | $6.5K | +$6.5K | — |
| GLAZER CAPITAL, LLC | 350,981 | +350,981 | $3.5K | +$3.5K | — |
| SYQUANT CAPITAL SAS | 105,750 | +105,750 | $1.1K | +$1.1K | — |
| HRT FINANCIAL LP | 99,635 | +99,635 | $996 | +$996 | — |
| Virtu Financial LLC | 23,105 | +23,105 | $231 | +$231 | — |
| FNY Investment Advisers, LLC | 3,800 | +3,800 | $38 | +$38 | — |
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.
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 BLRKW 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.