DOSSIER · 13F Holders · Q3 2025

QUANTUMSPHERE ACQUISITION CO

8 institutions still hold QUANTUMSPHERE ACQUISITION CO as of Q3 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP G7387B122·8 13F holders·last filed Sep 30, 2025
Market cap
13F value held
$3M
visible holders
Holders
8
filers reporting
Concentration
34.11%
ATW SPAC MANAGEMENT LLC #1
top holder share
AI Holders Summary · Q3 2025

8 institutions reported QUANTUMSPHERE ACQUISITION CO in Q3 2025. ATW SPAC MANAGEMENT LLC leads at 34.1% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
ATW SPAC MANAGEMENT LLC
CIK 0001878495
$1M100K1.28%Q3 2025
02
GABELLI & Co INVESTMENT ADVISERS, INC.
CIK 0000932724
$699K68K0.10%Q2 2026
03
GABELLI FUNDS LLC
CIK 0001081407
$592K57K0.00%Q2 2026
04
HRT FINANCIAL LP
CIK 0001475597
$316K31K0.00%Q4 2025
05
Clear Street Group Inc.
CIK 0001881567
$239K23K0.00%Q2 2026
06
JPMORGAN CHASE & CO
CIK 0000019617
$103K10K0.00%Q2 2026
07
UBS Group AG
CIK 0001610520
$5K4790.00%Q2 2026
08
GLAZER CAPITAL, LLC
CIK 0001076809
$2K2190.00%Q1 2026