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ArcelorMittal S.A. (AMSYF) has a market cap of $48.06B as of Friday, May 22, 2026. The AMSYF market cap is up 29.62% over the past 30 days and has grown 131.79% over the past year. Market capitalization represents the total market value of a company's outstanding shares, calculated by multiplying the stock price by the total number of shares outstanding.