# QUANTUMSPHERE ACQUISITION CO (QUMSU)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/QUMSU/

- Reporting holders: 7
- Reported value: $1.9M
- Shares held by institutions: 188,842 of 10,936,105 outstanding
- Held through calls: 0.0%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [GABELLI & Co INVESTMENT ADVISERS, INC.](https://holderbook.com/funds/932724-gabelli-co-investment-advisers-inc/) | $699.3K | 67,700 | 0.1% | 4 |
| [GABELLI FUNDS LLC](https://holderbook.com/funds/1081407-gabelli-funds-llc/) | $591.9K | 57,300 | 0.0% | 4 |
| [HRT FINANCIAL LP](https://holderbook.com/funds/1475597-hrt-financial-lp/) | $309.0K | 30,000 | 0.0% | 4 |
| [Clear Street Group Inc.](https://holderbook.com/funds/1881567-clear-street-group-inc/) | $239.1K | 23,142 | 0.0% | 4 |
| [JPMORGAN CHASE & CO](https://holderbook.com/funds/19617-jpmorgan-chase-co/) | $103.3K | 10,000 | 0.0% | 4 |
| [UBS Group AG](https://holderbook.com/funds/1610520-ubs-group-ag/) | $4.9K | 479 | 0.0% | 3 |
| [GLAZER CAPITAL, LLC](https://holderbook.com/funds/1076809-glazer-capital-llc/) | $2.0K | 221 | 0.0% | 2 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 7 | $1.9M |
| Q1 2026 | 8 | $2.9M |
| Q4 2025 | 9 | $11.3M |
| Q3 2025 | 30 | $56.8M |