QUANTUMSPHERE ACQUISITION CO

Historical 13F Holders

Symbol
QUMS
CUSIP
G7387B106
All holders as of
Q2 2026
Type
Equity
Class
ORD SHS
Reported Value, Excluding Options
Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for G7387B106 since 12/18/2024, largest first.

Filer % of Class Filed
Whiteowl Holdings LLC 13D 27.4% 9/15/2025
Event 8/5/2025
Berkley W R Corp 13G
7.7% 8/6/2026
Event 6/30/2026
Mizuho Financial Group, Inc. 13G 6.3% 2/12/2026
Event 12/31/2025
Under 5%, checked the "5 percent or less" box, or amended by a later filing (2)
Wolverine Asset Management, LLC 13G/A
3.0% 10/6/2026
Event 9/30/2026
Highbridge Capital Management, LLC 13G/A 0% 2/17/2026
Event 12/31/2025

13F Holders by Quarter

Period Filings Shares, Excl. Options Value, Excl. Options
2026 Q2 28 8.59 M $87.7 M
2026 Q1 29 7.56 M $76.4 M
2025 Q4 25 6.57 M $65.7 M
2025 Q3 4 851 k $8.48 M