Quantumsphere Acquisition Corp (QUMS) — Institutional Holders, Q2 2026
35 institutional investment managers reported a QUMS position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $90.8M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
QUMS in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- MIZUHO SECURITIES USAAdded · +757,023 sh+$4.3M
- BERKLEY W RAdded · +361,860 sh+$2.1M
- RLH CapitalAdded · +150,000 sh+$859.1K
- Westchester Capital ManagementAdded · +100,000 sh+$572.7K
- QuarryNew · +75,000 sh+$429.5K
Biggest sellers
- Shaolin Capital ManagementTrimmed · -54,860 sh-$314.2K
- TWO SIGMA INVESTMENTSSold out · -35,291 sh-$202.1K
- HEIGHTS CAPITAL MANAGEMENTTrimmed · -31,213 sh-$178.8K
- PERISCOPE CAPITALTrimmed · -25,000 sh-$143.2K
- Karpus ManagementTrimmed · -24,000 sh-$137.5K
QUMS 13F holders ranked 1–35 of 35
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | MIZUHO SECURITIES USA#1 · 1,489,007 sh | 1,489,007 | $15.0M | 0.15% | +103.4% |
| 2 | BERKLEY W R#2 · 905,510 sh | 905,510 | $9.0M | 0.43% | +66.6% |
| 3 | WOLVERINE ASSET MANAGEMENT#3 · 735,536 sh | 735,536 | $6.2M | 0.05% | -0.5% |
| 4 | Karpus Management#4 · 469,875 sh | 469,875 | $4.8M | 0.14% | -4.9% |
| 5 | RIVERNORTH CAPITAL MANAGEMENT#5 · 848,636 sh | 848,636 | $4.4M | 0.21% | 0.0% |
| 6 | Shaolin Capital Management#6 · 885,140 sh | 885,140 | $4.2M | 0.20% | -5.8% |
| 7 | D. E. Shaw#7 · 534,860 sh | 534,860 | $4.2M | <0.01% | 0.0% |
| 8 | GLAZER CAPITAL#8 · 820,846 sh | 820,846 | $4.2M | 0.10% | -2.7% |
| 9 | LINDEN ADVISORS#9 · 800,000 sh | 800,000 | $4.2M | 0.02% | 0.0% |
| 10 | Polar Asset Management Partners#10 · 800,000 sh | 800,000 | $4.2M | 0.07% | 0.0% |
| 11 | HIGHBRIDGE CAPITAL MANAGEMENT#11 · 684,923 sh | 684,923 | $3.9M | 0.10% | -15.6% |
| 12 | Westchester Capital Management#12 · 450,000 sh | 450,000 | $3.6M | 0.18% | +28.6% |
| 13 | AQR Arbitrage#13 · 636,771 sh | 636,771 | $3.3M | 0.05% | +1.2% |
| 14 | RLH Capital#14 · 434,900 sh | 434,900 | $2.6M | 1.24% | +52.7% |
| 15 | Hudson Bay Capital Management#15 · 385,000 sh | 385,000 | $2.4M | <0.01% | 0.0% |
| 16 | Clear Street Group#16 · 410,315 sh | 410,315 | $2.0M | <0.01% | -2.7% |
| 17 | Cable Car Capital#17 · 349,602 sh | 349,602 | $1.8M | 0.04% | 0.0% |
| 18 | Radcliffe Capital Management, L.P.#18 · 300,000 sh | 300,000 | $1.6M | 0.12% | 0.0% |
| 19 | HEIGHTS CAPITAL MANAGEMENT#19 · 256,968 sh | 256,968 | $1.6M | 0.36% | -10.8% |
| 20 | BNP PARIBAS FINANCIAL MARKETS#20 · 217,388 sh | 217,388 | $1.2M | <0.01% | 0.0% |
| 21 | TORONTO DOMINION BANK#21 · 817,905 sh | 817,905 | $1.2M | <0.01% | -12.7% |
| 22 | Crossingbridge Advisors#22 · 107,825 sh | 107,825 | $1.1M | 0.19% | 0.0% |
| 23 | PERISCOPE CAPITAL#23 · 200,000 sh | 200,000 | $786.6K | 0.07% | -11.1% |
| 24 | Quarry#24 · 75,000 sh | 75,000 | $766.5K | 0.06% | New |
| 25 | GABELLI & INVESTMENT ADVISERS#25 · 67,700 sh | 67,700 | $699.3K | 0.10% | 0.0% |
| 26 | GABELLI FUNDS#26 · 57,300 sh | 57,300 | $591.9K | <0.01% | 0.0% |
| 27 | Schonfeld Strategic Advisors#27 · 109,200 sh | 109,200 | $570.8K | <0.01% | -0.3% |
| 28 | HRT FINANCIAL#28 · 30,000 sh | 30,000 | $309.0K | <0.01% | -0.5% |
| 29 | Harraden Circle Investments#29 · 993,926 sh | 993,926 | $197.8K | 0.03% | 0.0% |
| 30 | Logan Stone Capital#30 · 14,495 sh | 14,495 | $148.1K | 0.03% | 0.0% |
| 31 | JPMORGAN CHASE#31 · 10,000 sh | 10,000 | $103.3K | 0.00% | 0.0% |
| 32 | HGC Investment Management#32 · 300,000 sh | 300,000 | $59.7K | 0.01% | -50.0% |
| 33 | BOOTHBAY FUND MANAGEMENT#33 · 100,000 sh | 100,000 | $16.1K | <0.01% | 0.0% |
| 34 | UBS Group AG#34 · 16,506 sh | 16,506 | $6.9K | 0.00% | +0.1% |
| 35 | MORGAN STANLEY#35 · 53 sh | 53 | $542.00 | 0.00% | -15.9% |
Funds that sold out of QUMS in Q2 2026 (2)
Held QUMS at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| TWO SIGMA INVESTMENTS35,291 sh | 35,291 | $357.1K |
| Virtu Financial22,303 sh | 22,303 | $226.0K |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.