On July 17, Alcoa declined 5.23% in regular trading, trading at $44.48/share, with turnover of $125 million. The sell-off reflects a dual headwind of weaker-than-expected Q2 results and persistent investor concern over its pending mega-acquisition of South32 aluminum assets.

Alcoa reported Q2 adjusted EPS of $2.12, missing the consensus estimate of $2.25 by 5.78%, though representing a 443% year-over-year increase from $0.39. Revenue came in at $3.97 billion versus expectations of $3.99 billion. Additionally, the company's announced acquisition of South32's bauxite, alumina, and aluminum assets for up to $5.6 billion continues to weigh on sentiment, with concerns over debt expansion, equity dilution from approximately $1 billion in stock consideration, and integration risks. Since the deal announcement on June 30, shares have fallen over 13%.

The broader aluminum sector traded lower in sympathy, with Century Aluminum down 3.31% and Kaiser Aluminum down 2.23%.

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