MIZUHO FINANCIAL GROUP INC - 31 Dec 2025 SCHEDULE 13G Report for Quantumsphere Acquisition Corporation Common Shares (QUMS)

Filing Manager
MIZUHO FINANCIAL GROUP INC
Reporting Manager
Mizuho Financial Group, Inc.
Security
Quantumsphere Acquisition Corporation Common Shares
Symbol
QUMS
Shares outstanding
11,398,190 shares
Disclosed Ownership
718,086 shares
Ownership
6.3%
Form type
SCHEDULE 13G
Filing time
12 Feb 2026, 06:54:30 UTC
Date of event
31 Dec 2025
SEC
View on sec.gov

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Quoteable Key Fact

"MIZUHO FINANCIAL GROUP INC disclosed 6.3% ownership in Quantumsphere Acquisition Corporation Common Shares (QUMS) on 31 Dec 2025."

Quick Takeaways

  • MIZUHO FINANCIAL GROUP INC filed SCHEDULE 13G for Quantumsphere Acquisition Corporation Common Shares (QUMS).
  • Disclosed ownership: 6.3%.
  • Date of event: 31 Dec 2025.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 12 Feb 2026, 06:54.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (1)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Mizuho Financial Group, Inc. 6.3% 718,086 718,086 0 /s/ Takahiro Katsura Takahiro Katsura, Managing Director, Global Corporate Function Coordination Department

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