Quantumsphere Acquisition Corp

QUMSNASDAQ

$10.350.00 (0.00%)as of Oct 7, 2026

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Insider buy

Insider sell

Congress buy

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Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

Quantumsphere Acquisition Corp price and activity chart data

Showing the 1Y range: Oct 7, 2025 to Oct 7, 2026. Price (+4.0%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
Mizuho Securities USA LLC	47.62%	$15M	0.14%	Add 103.42%
Berkley W R Corp	28.19%	$9.01M	0.41%	Add 73.32%
Wolverine Asset Management LLC	19.29%	$6.16M	0.05%	Not reported
Karpus Management, Inc.	15.03%	$4.8M	0.14%	Not reported
Rivernorth Capital Management, LLC	13.56%	$4.37M	0.21%	Not reported
D. E. Shaw & Co., Inc.	13.11%	$4.19M	0.00%	Not reported
Shaolin Capital Management LLC	12.98%	$4.15M	0.20%	Not reported
Glazer Capital, LLC	12.80%	$4.09M	0.10%	Not reported
Linden Advisors LP	12.79%	$4.09M	0.02%	Not reported
Polar Asset Management Partners Inc.	12.79%	$4.09M	0.07%	Not reported
Highbridge Capital Management LLC	12.08%	$3.87M	0.09%	Add 211.87%
Westchester Capital Management, LLC	11.19%	$3.58M	0.18%	Add 40.00%
AQR Arbitrage LLC	10.00%	$3.19M	0.05%	Not reported
RLH Capital LLC	8.00%	$2.56M	1.22%	Add 150.00%
Hudson Bay Capital Management LP	7.52%	$2.4M	0.01%	Not reported
Cable Car Capital, LP	5.59%	$1.79M	0.04%	Not reported
Clear Street Group Inc.	5.27%	$1.68M	0.00%	Not reported
Heights Capital Management, Inc	4.80%	$1.53M	0.35%	Not reported
Radcliffe Capital Management, L.P.	4.80%	$1.53M	0.12%	Not reported
BNP Paribas Financial Markets	3.68%	$1.18M	0.00%	Not reported
Crossingbridge Advisors, LLC	3.45%	$1.1M	0.19%	Not reported
Toronto Dominion Bank	3.20%	$1.02M	0.00%	Not reported
Periscope Capital Inc.	2.40%	$767K	0.07%	Not reported
Quarry LP	2.40%	$767K	0.06%	New Not reported
Schonfeld Strategic Advisors LLC	1.76%	$562K	0.00%	Not reported
Logan Stone Capital, LLC	0.46%	$148K	0.03%	Reduce 0.03%
Morgan Stanley	0.00%	$542	0.00%	Not reported

End of history · 27 holders

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