← All Quantumsphere Acquisition CORP filings

Quantumsphere Acquisition CORP Schedule 13G passive stakes

Filed when an investor crosses five percent without intending to seek control — the passive counterpart to a 13D.

NASDAQ
QUMS
Quantumsphere Acquisition CORP
SCHEDULE: W. R. Berkley Discloses Stake in Quantumsphere Acquisition Corp
W. R. Berkley Corporation and its subsidiary Berkley Insurance Company have reported beneficial ownership of 7.7% of Quantumsphere Acquisition Corp's Class A ordinary shares.
NASDAQ
QUMS
Quantumsphere Acquisition CORP
SCHEDULE: Mizuho Financial Group Discloses 6.3% Stake in Quantumsphere
Mizuho Financial Group, Inc. has reported a 6.3% beneficial ownership stake in Quantumsphere Acquisition Corporation as of December 31, 2025.
NASDAQ
QUMS
Quantumsphere Acquisition CORP
SCHEDULE: Highbridge Capital Discloses 5.3% Stake in Quantumsphere
Highbridge Capital Management LLC has reported a 5.3% beneficial ownership stake in Quantumsphere Acquisition Corp, holding 600,000 ordinary shares.
NASDAQ
QUMS
Quantumsphere Acquisition CORP
SCHEDULE: Wolverine Group Discloses 5.03% Stake in Quantumsphere
Wolverine Asset Management and affiliated entities report a 5.03% beneficial ownership stake in Quantumsphere Acquisition Corp.