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AA 424B3: Acquisition

Filed with the SEC on · accession 0001193125-26-385352

AA filed a 424B3 (prospectus (offering)) with the SEC on Sep 8, 2026. Alcoa Corp is issuing shares of common stock to South32 Limited as part of the consideration for acquiring South32's interests in bauxite mine, alumina refinery and certain aluminum smelter operations. The stock moved +3.5% by the first close after the filing.

Summary of the filing

Alcoa Corp is issuing shares of common stock to South32 Limited as part of the consideration for acquiring South32's interests in bauxite mine, alumina refinery and certain aluminum smelter operations. The total consideration includes $3.1 billion in cash and 17,008,960 shares of Alcoa common stock, with a potential additional contingent payment of up to $750 million.

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Key details

Cash consideration$3.1B
Stock consideration (shares)shares 17.0M
Contingent value right maximum$750.0M
AcquirerAlcoa Corp
SellerSouth32 Limited

How AA stock reacted

Close before

$49.97

Sep 4, 2026

First close after

+3.54%

$51.74

5 trading days

-6.04%

$46.95

Since filing

-20.87%

$39.54

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Frequently asked questions

What did AA file with the SEC on Sep 8, 2026?

AA filed a 424B3 (Acquisition). Alcoa Corp is issuing shares of common stock to South32 Limited as part of the consideration for acquiring South32's interests in bauxite mine, alumina refinery and certain aluminum smelter operations. The total consideration includes $3.1 billion in cash and 17,008,960 shares of Alcoa common stock, with a potential additional contingent payment of up to $750 million.

What does a acquisition mean for AA stock?

A contract important enough that investors need to know about it — a big customer contract, a loan, a merger agreement or a partnership.

How do I read a 424B3?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

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 424B3 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did AA stock react to this filing?

AA closed at $49.97 before the filing and $51.74 on Sep 8, 2026 (+3.54%). Five trading days later: $46.95 (-6.04%).

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