13F Insight
DOSSIER · 13F Holders · Q2 2026

QUANTUMSPHERE ACQUISITION CO

25 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 G7387B114·25 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$1M
visible holders
Holders
25
filers reporting
Concentration
16.72%
Harraden Circle Investments, LLC #1
top holder share
AI Holders Summary · Q2 2026

25 institutions reported QUANTUMSPHERE ACQUISITION CO in Q2 2026. Harraden Circle Investments, LLC leads at 16.7% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
Harraden Circle Investments, LLC
CIK 0001910592
$198K994K0.03%Q2 202602
TORONTO DOMINION BANK
CIK 0000947263
$143K718K0.00%Q2 202603
RIVERNORTH CAPITAL MANAGEMENT, LLC
CIK 0001447578
$106K425K0.01%Q1 202604
Shaolin Capital Management LLC
CIK 0001766806
$95K479K0.00%Q2 202605
GLAZER CAPITAL, LLC
CIK 0001076809
$67K421K0.00%Q1 202606
AQR Arbitrage LLC
CIK 0001167456
$65K323K0.00%Q4 202507
LINDEN ADVISORS LP
CIK 0001279396
$64K400K0.00%Q2 202608
Polar Asset Management Partners Inc.
CIK 0001326389
$64K400K0.00%Q2 202609
HGC Investment Management Inc.
CIK 0001711200
$60K300K0.01%Q2 202610
HIGHBRIDGE CAPITAL MANAGEMENT LLC
CIK 0000919185
$52K307K0.00%Q2 202611
Clear Street Group Inc.
CIK 0001881567
$44K222K0.00%Q2 202612
Cable Car Capital, LP
CIK 0001699575
$35K175K0.00%Q2 202613
RLH Capital LLC
CIK 0002008031
$30K185K0.01%Q2 202614
WOLVERINE ASSET MANAGEMENT LLC
CIK 0001279891
$26K133K0.00%Q2 202615
D. E. Shaw & Co., Inc.
CIK 0001009207
$26K125K0.00%Q4 202516
Hudson Bay Capital Management LP
CIK 0001393825
$26K150K0.00%Q2 202617
Radcliffe Capital Management, L.P.
CIK 0001218275
$24K150K0.00%Q2 202618
HEIGHTS CAPITAL MANAGEMENT, INC
CIK 0001081698
$21K107K0.00%Q2 202619
PERISCOPE CAPITAL INC.
CIK 0001695320
$20K125K0.00%Q2 202620
BNP PARIBAS FINANCIAL MARKETS
CIK 0001166588
$16K102K0.00%Q2 2026
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