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ATLQU SCHEDULE 13G/A: SEC filing

Mizuho Financial Group

Filed with the SEC on · accession 0001104659-26-125805

ATLQU filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 12, 2026. Mizuho Financial Group filed an amended Schedule 13G indicating beneficial ownership of 814,156 common shares (4.4%) of Atlantic Acquisition Corp I as of September 30, 2026, held indirectly through its subsidiary Mizuho Securities USA LLC. The stock moved +0.9% by the first close after the filing.

Summary of the filing

Mizuho Financial Group filed an amended Schedule 13G indicating beneficial ownership of 814,156 common shares (4.4%) of Atlantic Acquisition Corp I 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$814K
Filer / indirect beneficial ownerMizuho Financial Group, Inc.
Direct holder of the securities, wholly-owned subsidiary of mizuho financial groupMizuho Securities USA LLC
Subsidiary included in filing groupMizuho Bank, Ltd.
Subsidiary included in filing groupMizuho Americas LLC
Subject company / issuerAtlantic Acquisition Corp I
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

How ATLQU stock reacted

Close before

$10.11

Nov 11, 2026

First close after

+0.89%

$10.20

5 trading days

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Since filing

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Frequently asked questions

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

ATLQU filed a SCHEDULE 13G/A (SEC filing). Mizuho Financial Group filed an amended Schedule 13G indicating beneficial ownership of 814,156 common shares (4.4%) of Atlantic Acquisition Corp I 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).

How did ATLQU stock react to this filing?

ATLQU closed at $10.11 before the filing and $10.20 on Nov 12, 2026 (+0.89%).

Other ATLQU SEC filings

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