Largest Aluminum Companies and Producers by Market Cap

Aluminum is the second most widely used metal in the world after steel, and its production chain — from bauxite mining through alumina refining to smelting — spans multiple continents. China accounts for over half of global primary aluminum output, making Chinese producers some of the largest aluminum companies by market cap.

The major publicly traded aluminum producers and manufacturers are listed across several exchanges worldwide:

• China Hongqiao Group (HKEX) — one of the world’s largest aluminum producers by volume, headquartered in Shandong province.
• Chalco / Aluminum Corporation of China (Shanghai, HKEX, NYSE) — established in 2001, covering bauxite mining, alumina refining, and aluminum smelting across China.
• Alcoa Corporation (NYSE: AA) — founded in 1888 as the Pittsburgh Reduction Company, with operations spanning Australia, Brazil, and Canada.
• Norsk Hydro (Oslo: HYDRO) — a fully integrated aluminum company founded in Norway in 1905, originally established to harness hydroelectric power.
• Hindalco Industries (BSE/NSE) — part of India’s Aditya Birla Group, with aluminum operations dating back to 1962 and the acquisition of Novelis making it the world’s largest rolled-aluminum producer.
• Constellium SE (NYSE: CSTM) — founded in 2011 with roots tracing back to Alcan, Pechiney, and Alusuisse, specializing in high-performance aluminum products for aerospace, automotive, and packaging.

Diversified miners such as Rio Tinto and South32 also operate significant aluminum divisions but are classified as multi-commodity producers. Aluminum itself is derived from bauxite ore through the Bayer process (to produce alumina) and then smelted via the Hall–Héroult process.

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The table below lists the largest aluminum producing companies ranked by market capitalization, including both pure-play aluminum manufacturers and integrated producers with major smelting operations. All data — including share price and market cap — updates automatically to reflect current market conditions.