As of September 2026 Rio Tinto has a market cap of โฌ137.81 Billion. This makes Rio Tinto the world's 137th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Sep 19th, 2026 the market cap of Rio Tinto was reported to be: