New Positions
22 managers initiated
Top five by reported value
Quantumsphere Acquisition Corp NASDAQ NMS - GLOBAL MARKET:QUMSU
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
22 new2 added1 reduced1 exited
Total Institutional Holders
25
as of 2025-12-31
Top Holder
MIZUHO SECURITIES USA LLC
$7.1M
Largest QoQ Increase
MIZUHO SECURITIES USA LLC
+718,086 sh
Largest QoQ Decrease
HIGHBRIDGE CAPITAL MANAGEMENT LLC
-600,000 sh
New Positions(22)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| MIZUHO SECURITIES USA LLC | 718,086 | +718,086 | $7.1M | +$7.1M | — |
| WOLVERINE ASSET MANAGEMENT LLC | 575,222 | +575,222 | $5.8M | +$5.8M | — |
| Karpus Management, Inc. | 494,350 | +494,350 | $4.9M | +$4.9M | — |
| Shaolin Capital Management LLC | 480,000 | +480,000 | $4.8M | +$4.8M | — |
| D. E. Shaw & Co., Inc. | 409,860 | +409,860 | $4.1M | +$4.1M | — |
| Linden Advisors LP | 400,000 | +400,000 | $4.0M | +$4.0M | — |
| AQR Arbitrage LLC | 322,660 | +322,660 | $3.2M | +$3.2M | — |
| BERKLEY W R CORP | 303,580 | +303,580 | $3.0M | +$3.0M | — |
| HGC Investment Management Inc. | 300,000 | +300,000 | $3.0M | +$3.0M | — |
| Westchester Capital Management, LLC | 250,000 | +250,000 | $2.5M | +$2.5M | — |
| TWO SIGMA INVESTMENTS, LP | 217,479 | +217,479 | $2.2M | +$2.2M | — |
| TORONTO DOMINION BANK | 175,778 | +175,778 | $1.8M | +$1.8M | — |
| Cable Car Capital, LP | 174,801 | +174,801 | $1.7M | +$1.7M | — |
| HEIGHTS CAPITAL MANAGEMENT, INC | 150,000 | +150,000 | $1.5M | +$1.5M | — |
| Radcliffe Capital Management, L.P. | 150,000 | +150,000 | $1.5M | +$1.5M | — |
| Periscope Capital Inc. | 125,000 | +125,000 | $1.3M | +$1.3M | — |
| BNP PARIBAS ARBITRAGE, SNC | 102,340 | +102,340 | $1.0M | +$1.0M | — |
| Schonfeld Strategic Advisors LLC | 55,000 | +55,000 | $550.5K | +$550.5K | — |
| Warberg Asset Management LLC | 41,421 | +41,421 | $414.6K | +$414.6K | — |
| Logan Stone Capital, LLC | 14,500 | +14,500 | $145.1K | +$145.1K | — |
| GLAZER CAPITAL, LLC | 424,153 | +424,153 | $4.2K | +$4.2K | — |
| MORGAN STANLEY | 30 | +30 | $300 | +$300 | — |
Added To(2)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Clear Street Group Inc. | 424,762 | +423,363 | $4.3M | +$4.2M | 30261.8% |
| Virtu Financial LLC | 24,783 | +9,849 | $248 | +$99 | 66.0% |
Reduced(1)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Hudson Bay Capital Management LP | 235,000 | 0 | $2.4M | +$11.8K | 0.0% |
Sold Out(1)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | 0 | -600,000 | $0 | -$6.0M | — |
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 % |
|---|---|---|---|---|
| MIZUHO SECURITIES USA LLC | 718,086 | $7.1M | +718,086 | — |
| WOLVERINE ASSET MANAGEMENT LLC | 575,222 | $5.8M | +575,222 | — |
| Karpus Management, Inc. | 494,350 | $4.9M | +494,350 | — |
| Shaolin Capital Management LLC | 480,000 | $4.8M | +480,000 | — |
| Clear Street Group Inc. | 424,762 | $4.3M | +423,363 | 30261.8% |
| D. E. Shaw & Co., Inc. | 409,860 | $4.1M | +409,860 | — |
| Linden Advisors LP | 400,000 | $4.0M | +400,000 | — |
| AQR Arbitrage LLC | 322,660 | $3.2M | +322,660 | — |
| BERKLEY W R CORP | 303,580 | $3.0M | +303,580 | — |
| HGC Investment Management Inc. | 300,000 | $3.0M | +300,000 | — |
| Westchester Capital Management, LLC | 250,000 | $2.5M | +250,000 | — |
| Hudson Bay Capital Management LP | 235,000 | $2.4M | 0 | 0.0% |
| TWO SIGMA INVESTMENTS, LP | 217,479 | $2.2M | +217,479 | — |
| TORONTO DOMINION BANK | 175,778 | $1.8M | +175,778 | — |
| Cable Car Capital, LP | 174,801 | $1.7M | +174,801 | — |
| Radcliffe Capital Management, L.P. | 150,000 | $1.5M | +150,000 | — |
| HEIGHTS CAPITAL MANAGEMENT, INC | 150,000 | $1.5M | +150,000 | — |
| Periscope Capital Inc. | 125,000 | $1.3M | +125,000 | — |
| BNP PARIBAS ARBITRAGE, SNC | 102,340 | $1.0M | +102,340 | — |
| Schonfeld Strategic Advisors LLC | 55,000 | $550.5K | +55,000 | — |
New & Closed Positions this quarter
Closed Positions
1 managers exited
Top five by prior-quarter value
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 QUMSU 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.