On September 19, Alcoa fell 5.04% in regular trading, trading at $44.60 per share, with turnover of $111 million. The decline comes as the broader aluminum sector faced selling pressure, with the stock continuing to slide following the company's announcement of a $2.6 billion senior notes offering to finance its acquisition of South32's aluminum value chain assets.

On September 9, Alcoa disclosed plans to issue senior notes due in 2034 and 2036, with proceeds earmarked to fund the $3.1 billion cash consideration for the South32 deal. The $5.6 billion total transaction, announced in late June, encompasses bauxite mines, alumina refineries, and aluminum smelting operations across Australia, South Africa, and Brazil. Since the deal's announcement, the stock has fallen sharply as investors weighed debt accumulation, equity dilution, and integration risks. Q2 adjusted EPS of $2.12 also missed the $2.25 consensus estimate.

Within the Aluminum sector, Century Aluminum fell 2.84%, Constellium NV fell 3.09%, Kaiser Aluminum fell 3.59%, while Tredegar rose 0.44%.

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