13F

Stock

Quantumsphere Acquisition Co

Ticker not mapped · held by 25 managers

Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025

Reported value

$61.2M

Holders

25

+1 new · −0 exited

Holders’ est. mark

$11.7K

Price effect on 1 books still in the name

Largest holder

$7.13M

MIZUHO SECURITIES USA LLC

Holder count by quarter

Q3 2025Q4 2025Q1 2026

Who holds it

Notable only
InvestorSharesValueEst. markChange
MIZUHO SECURITIES USA LLC718.1K$7.13M—Held
WOLVERINE ASSET MANAGEMENT LLC575.2K$5.76M—Held
Karpus Management, Inc.494.4K$4.95M—Held
Shaolin Capital Management LLC480K$4.8M—Held
Clear Street Group Inc.424.8K$4.25M—Held
D. E. Shaw & Co., Inc.409.9K$4.1M—Held
Linden Advisors LP400K$4M—Held
AQR Arbitrage LLC322.7K$3.23M—Held
BERKLEY W R CORP303.6K$3.04M—Held
HGC Investment Management Inc.300K$3M—Held
Westchester Capital Management, LLC250K$2.5M—Held
Hudson Bay Capital Management LP235K$2.35M$11.7KAdded$11.8K
TWO SIGMA INVESTMENTS, LP217.5K$2.18M—Held
TORONTO DOMINION BANK175.8K$1.76M—Held
Cable Car Capital, LP174.8K$1.75M—Held
Radcliffe Capital Management, L.P.150K$1.5M—Held
HEIGHTS CAPITAL MANAGEMENT, INC150K$1.5M—Held
Periscope Capital Inc.125K$1.25M—Held
BNP PARIBAS FINANCIAL MARKETS102.3K$1.02M—Held
Schonfeld Strategic Advisors LLC55K$550.5K—Held
Warberg Asset Management LLC41.4K$414.6K—Held
Logan Stone Capital, LLC14.5K$145.1K—Held
Glazer Capital, LLC424.2K$4.25K—Held
MORGAN STANLEY30$300—New
Virtu Financial LLC24.8K$248—Held

Positions as of Q4 2025. 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.