13F Insight
DOSSIER · 13F Holders · Q2 2026

QUANTUMSPHERE ACQUISITION CO

28 institutions still hold QUANTUMSPHERE ACQUISITION CO as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP G7387B106·28 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$84M
visible holders
Holders
28
filers reporting
Concentration
18.00%
MIZUHO SECURITIES USA LLC #1
top holder share
AI Holders Summary · Q2 2026

28 institutions reported QUANTUMSPHERE ACQUISITION CO in Q2 2026. MIZUHO SECURITIES USA LLC leads at 18.0% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
MIZUHO SECURITIES USA LLC
CIK 0000812291
$15M1.5M0.14%Q2 202602
BERKLEY W R CORP
CIK 0000011544
$9M881K0.41%Q2 202603
WOLVERINE ASSET MANAGEMENT LLC
CIK 0001279891
$6M603K0.05%Q2 202604
Karpus Management, Inc.
CIK 0001048703
$5M494K0.16%Q1 202605
RIVERNORTH CAPITAL MANAGEMENT, LLC
CIK 0001447578
$4M425K0.21%Q1 202606
GLAZER CAPITAL, LLC
CIK 0001076809
$4M423K0.09%Q1 202607
Shaolin Capital Management LLC
CIK 0001766806
$4M406K0.20%Q2 202608
D. E. Shaw & Co., Inc.
CIK 0001009207
$4M410K0.00%Q4 202509
LINDEN ADVISORS LP
CIK 0001279396
$4M400K0.02%Q2 202610
Polar Asset Management Partners Inc.
CIK 0001326389
$4M400K0.07%Q2 202611
HIGHBRIDGE CAPITAL MANAGEMENT LLC
CIK 0000919185
$4M378K0.09%Q2 202612
Westchester Capital Management, LLC
CIK 0001512805
$4M350K0.18%Q2 202613
AQR Arbitrage LLC
CIK 0001167456
$3M323K0.07%Q4 202514
RLH Capital LLC
CIK 0002008031
$3M250K1.22%Q2 202615
Hudson Bay Capital Management LP
CIK 0001393825
$2M235K0.01%Q2 202616
Cable Car Capital, LP
CIK 0001699575
$2M175K0.04%Q2 202617
Clear Street Group Inc.
CIK 0001881567
$2M165K0.00%Q2 202618
HEIGHTS CAPITAL MANAGEMENT, INC
CIK 0001081698
$2M150K0.35%Q2 202619
Radcliffe Capital Management, L.P.
CIK 0001218275
$2M150K0.12%Q2 202620
BNP PARIBAS FINANCIAL MARKETS
CIK 0001166588
$1M115K0.00%Q2 2026
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