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MCGA SCHEDULE 13G: SEC filing

Westchester Capital Management, LLC and affiliated entities

Filed with the SEC on · accession 0001140361-26-043532

MCGA filed a SCHEDULE 13G (schedule 13g) with the SEC on Nov 13, 2026. Westchester Capital Management, LLC and affiliated entities filed a Schedule 13G reporting beneficial ownership of approximately 6.30% of Yorkville Acquisition Corp.'s Class A ordinary shares, with related funds and advisers reporting additional stakes. The stock moved +0.0% by the first close after the filing.

Summary of the filing

Westchester Capital Management, LLC and affiliated entities filed a Schedule 13G reporting beneficial ownership of approximately 6.30% of Yorkville Acquisition Corp.'s Class A ordinary shares, with related funds and advisers reporting additional stakes. The filing is a passive investment disclosure under Rule 13d-1(b), indicating no intent to influence control of the issuer.

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Key details

Shares outstanding of Class A ordinary shares as of August 12, 2026$17.8M
Shares beneficially owned by Westchester Capital Management, LLC$1.1M
Shares beneficially owned by Westchester Capital Partners, LLC$7K
Shares beneficially owned by Virtus Investment Advisers, LLC$1.0M
Shares beneficially owned by The Merger Fund$982K
IssuerYorkville Acquisition Corp.
Reporting person / beneficial ownerWestchester Capital Management, LLC
Reporting person / beneficial ownerWestchester Capital Partners, LLC
Reporting person / beneficial ownerVirtus Investment Advisers, LLC
Reporting person / beneficial ownerThe Merger Fund
Chief compliance officer, westchester capital management, llcCaSaundra Wu
Chief compliance officer, virtus investment advisers, llcJames Sena
Vice president, counsel and assistant secretary, the merger fundDaphne Chisolm
Co-president, westchester capital management, llc and westchester capital partners, llcRoy Behren
Co-president, westchester capital management, llc and westchester capital partners, llcMichael T. Shannon

How MCGA stock reacted

Close before

$10.42

Nov 12, 2026

First close after

+0.00%

$10.42

5 trading days

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Since filing

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Frequently asked questions

What did MCGA file with the SEC on Nov 13, 2026?

MCGA filed a SCHEDULE 13G (SEC filing). Westchester Capital Management, LLC and affiliated entities filed a Schedule 13G reporting beneficial ownership of approximately 6.30% of Yorkville Acquisition Corp.'s Class A ordinary shares, with related funds and advisers reporting additional stakes. The filing is a passive investment disclosure under Rule 13d-1(b), indicating no intent to influence control of the issuer.

How do I read a SCHEDULE 13G?

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 (schedule 13g): A report the company filed with the SEC (the US market regulator).

How did MCGA stock react to this filing?

MCGA closed at $10.42 before the filing and $10.42 on Nov 13, 2026 (+0.00%).

Other MCGA SEC filings

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