QSEA SCHEDULE 13G/A: SEC filing

Mizuho Financial Group

Filed with the SEC on Nov 12, 2026 · accession 0001104659-26-125706

QSEA filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 12, 2026. Mizuho Financial Group filed an amended Schedule 13G reporting beneficial ownership of 700,000 common shares (6.9%) of Quartzsea Acquisition Corp as of September 30, 2026, held indirectly through its subsidiary Mizuho Securities USA LLC.

Summary of the filing

Mizuho Financial Group filed an amended Schedule 13G reporting beneficial ownership of 700,000 common shares (6.9%) of Quartzsea Acquisition Corp as of September 30, 2026, held indirectly through its subsidiary Mizuho Securities USA LLC. The filing is a passive investment disclosure with no intent to influence control.

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Key details

Common shares beneficially owned$700K

Reporting beneficial owner (filer)Mizuho Financial Group, Inc.

Direct holder of the shares; wholly-owned subsidiary of mizuho financial groupMizuho Securities USA LLC

Subsidiary that may be deemed indirect beneficial ownerMizuho Bank, Ltd.

Subsidiary that may be deemed indirect beneficial ownerMizuho Americas LLC

Issuer of the securities (subject company)Quartzsea Acquisition Corp

Managing director, global corporate function coordination department, mizuho financial groupTakahiro Katsura

Senior managing corporate executive, head of global corporate & investment banking, mizuho financial groupShuji Matsuura

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Frequently asked questions

What did QSEA file with the SEC on Nov 12, 2026?

QSEA filed a SCHEDULE 13G/A (SEC filing). Mizuho Financial Group filed an amended Schedule 13G reporting beneficial ownership of 700,000 common shares (6.9%) of Quartzsea Acquisition Corp as of September 30, 2026, held indirectly through its subsidiary Mizuho Securities USA LLC. The filing is a passive investment disclosure with no intent to influence control.

How do I read a SCHEDULE 13G/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).

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