QUANTUMSPHERE ACQUISITION CO (QUMSR)
Institutional ownership reported to the SEC as of Q2 2026, across 4 quarters.
24
Reporting holders
$1.1M
Reported value
55.9%
Of shares outstanding
0.0%
Held as options
+1
Holder change
Institutions report 6,115,562 shares against 10,936,105 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Harraden Circle Investments, LLC | $197.8K | 993,926 | 0.03% | 4q | HELD |
| TORONTO DOMINION BANK | $142.9K | 717,905 | 0.00% | 4q | +7.0%+$9.4K |
| Shaolin Capital Management LLC | $95.4K | 479,379 | 0.00% | 3q | +4.2%+$3.9K |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | $65.8K | 424,512 | 0.00% | 2q | HELD |
| AQR Arbitrage LLC | $64.5K | 324,248 | 0.00% | 3q | +1.0% |
| Linden Advisors LP | $64.3K | 400,000 | 0.00% | 3q | HELD |
| Polar Asset Management Partners Inc. | $64.3K | 400,000 | 0.00% | 2q | HELD |
| HGC Investment Management Inc. | $59.7K | 300,000 | 0.01% | 3q | HELD |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | $52.2K | 307,316 | 0.00% | 4q | -55.5%-$65.1K |
| Clear Street Group Inc. | $44.3K | 222,380 | 0.00% | 3q | -0.9% |
| Cable Car Capital, LP | $34.8K | 174,801 | 0.00% | 3q | HELD |
| RLH Capital LLC | $29.7K | 184,900 | 0.01% | 2q | HELD |
| WOLVERINE ASSET MANAGEMENT LLC | $26.4K | 132,552 | 0.00% | 3q | -2.0% |
| Hudson Bay Capital Management LP | $25.5K | 150,000 | 0.00% | 4q | HELD |
| Radcliffe Capital Management, L.P. | $24.1K | 150,000 | 0.00% | 3q | HELD |
| HEIGHTS CAPITAL MANAGEMENT, INC | $21.3K | 106,968 | 0.00% | 3q | -22.6%-$6.2K |
| D. E. Shaw & Co., Inc. | $21.2K | 125,000 | 0.00% | 3q | HELD |
| Periscope Capital Inc. | $20.1K | 125,000 | 0.00% | 3q | HELD |
| BNP PARIBAS FINANCIAL MARKETS | $16.4K | 102,340 | 0.00% | 3q | HELD |
| BOOTHBAY FUND MANAGEMENT, LLC | $16.1K | 100,000 | 0.00% | 3q | HELD |
| Westchester Capital Management, LLC | $12.2K | 100,000 | 0.00% | new | NEW |
| Schonfeld Strategic Advisors LLC | $8.7K | 54,200 | 0.00% | 3q | -0.6% |
| BERKLEY W R CORP | $3.9K | 24,108 | 0.00% | 3q | -31.3%-$1.8K |
| UBS Group AG | $2.0K | 16,027 | 0.00% | 3q | HELD |
| GLAZER CAPITAL, LLC | $68 | 420,536 | 0.00% | 3q | HELD |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 24 | $1.1M | 6,115,562 | 1 | 3 | 6 | 0.0% |
| Q1 2026 | 23 | $1.6M | 6,376,133 | 2 | 1 | 5 | 0.0% |
| Q4 2025 | 22 | $1.1M | 5,454,087 | 18 | 2 | 2 | 0.0% |
| Q3 2025 | 4 | $224.0K | 1,152,500 | 4 | 0 | 0 | 0.0% |