# QUANTUMSPHERE ACQUISITION CO (QUMS)

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

- Reporting holders: 27
- Reported value: $87.7M
- Shares held by institutions: 8,590,247 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 |
|---|---|---|---|---|
| [MIZUHO SECURITIES USA LLC](https://holderbook.com/funds/812291-mizuho-securities-usa-llc/) | $15.0M | 1,489,007 | 0.1% | 3 |
| [BERKLEY W R CORP](https://holderbook.com/funds/11544-berkley-w-r-corp/) | $9.0M | 881,402 | 0.4% | 3 |
| [WOLVERINE ASSET MANAGEMENT LLC](https://holderbook.com/funds/1279891-wolverine-asset-management-llc/) | $6.2M | 602,984 | 0.1% | 3 |
| [Karpus Management, Inc.](https://holderbook.com/funds/1048703-karpus-management-inc/) | $4.8M | 469,875 | 0.1% | 3 |
| [RIVERNORTH CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1447578-rivernorth-capital-management-llc/) | $4.4M | 424,124 | 0.2% | 2 |
| [D. E. Shaw & Co., Inc.](https://holderbook.com/funds/1009207-d-e-shaw-co-inc/) | $4.2M | 409,860 | 0.0% | 3 |
| [Shaolin Capital Management LLC](https://holderbook.com/funds/1766806-shaolin-capital-management-llc/) | $4.1M | 405,761 | 0.2% | 3 |
| [GLAZER CAPITAL, LLC](https://holderbook.com/funds/1076809-glazer-capital-llc/) | $4.1M | 400,089 | 0.1% | 3 |
| [Linden Advisors LP](https://holderbook.com/funds/1279396-linden-advisors-lp/) | $4.1M | 400,000 | 0.0% | 3 |
| [Polar Asset Management Partners Inc.](https://holderbook.com/funds/1326389-polar-asset-management-partners-inc/) | $4.1M | 400,000 | 0.1% | 2 |
| [HIGHBRIDGE CAPITAL MANAGEMENT LLC](https://holderbook.com/funds/919185-highbridge-capital-management-llc/) | $3.9M | 377,607 | 0.1% | 2 |
| [Westchester Capital Management, LLC](https://holderbook.com/funds/1512805-westchester-capital-management-llc/) | $3.6M | 350,000 | 0.2% | 3 |
| [AQR Arbitrage LLC](https://holderbook.com/funds/1167456-aqr-arbitrage-llc/) | $3.2M | 312,523 | 0.0% | 3 |
| [RLH Capital LLC](https://holderbook.com/funds/2008031-rlh-capital-llc/) | $2.6M | 250,000 | 1.2% | 2 |
| [Hudson Bay Capital Management LP](https://holderbook.com/funds/1393825-hudson-bay-capital-management-lp/) | $2.4M | 235,000 | 0.0% | 4 |
| [Cable Car Capital, LP](https://holderbook.com/funds/1699575-cable-car-capital-lp/) | $1.8M | 174,801 | 0.0% | 3 |
| [Clear Street Group Inc.](https://holderbook.com/funds/1881567-clear-street-group-inc/) | $1.7M | 164,793 | 0.0% | 4 |
| [HEIGHTS CAPITAL MANAGEMENT, INC](https://holderbook.com/funds/1081698-heights-capital-management-inc/) | $1.5M | 150,000 | 0.4% | 3 |
| [Radcliffe Capital Management, L.P.](https://holderbook.com/funds/1218275-radcliffe-capital-management-l-p/) | $1.5M | 150,000 | 0.1% | 3 |
| [BNP PARIBAS FINANCIAL MARKETS](https://holderbook.com/funds/1166588-bnp-paribas-financial-markets/) | $1.2M | 115,048 | 0.0% | 3 |
| [Crossingbridge Advisors, LLC](https://holderbook.com/funds/1770024-crossingbridge-advisors-llc/) | $1.1M | 107,825 | 0.2% | 2 |
| [TORONTO DOMINION BANK](https://holderbook.com/funds/947263-toronto-dominion-bank/) | $1.0M | 100,000 | 0.0% | 3 |
| [Periscope Capital Inc.](https://holderbook.com/funds/1695320-periscope-capital-inc/) | $766.5K | 75,000 | 0.1% | 3 |
| [Quarry LP](https://holderbook.com/funds/1965207-quarry-lp/) | $766.5K | 75,000 | 0.1% | 1 |
| [Schonfeld Strategic Advisors LLC](https://holderbook.com/funds/1665241-schonfeld-strategic-advisors-llc/) | $562.1K | 55,000 | 0.0% | 3 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 27 | $87.7M |
| Q1 2026 | 29 | $76.4M |
| Q4 2025 | 25 | $65.7M |
| Q3 2025 | 4 | $8.5M |