Stock
Quantumsphere Acquisition Co
Ticker not mapped · held by 8 managers
Reported value
$2.64M
Holders
8
+1 new · −2 exited
Holders’ est. mark
$12.2K
Price effect on 7 books still in the name
Largest holder
$1.01M
Westchester Capital Management, LLC
Holder count by quarter
Who holds it
Notable only| Investor | Shares | Value | Est. mark | Change |
|---|---|---|---|---|
| Westchester Capital Management, LLC | 100K | $1.01M | −$7K | Cut−$7K |
| GABELLI & Co INVESTMENT ADVISERS, INC. | 67.7K | $698.7K | $9.48K | Added$9.48K |
| GABELLI FUNDS LLC | 57.3K | $591.3K | $8.02K | Added$8.02K |
| Clear Street Group Inc. | 22.5K | $231.8K | $2.08K | Added$80.5K |
| JPMORGAN CHASE & CO | 10K | $101.5K | −$300 | Cut−$300 |
| UBS Group AG | 464 | $4.69K | −$37 | Added$13 |
| HRT FINANCIAL LP | 30.1K | $304 | −$2 | Cut−$12 |
| Glazer Capital, LLC | 219 | $2 | — | New |
Who left
Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.