|Company||Market Cap (USD)|
|Rio Tinto||$108.13 B|
|Glencore plc||$74.02 B|
|Vale SA||$61.99 B|
|Fortescue Metals Group Limited||$47.27 B|
The market capitalization of a company, more simply referred to as "market cap", is the total market value of a publicly traded company's outstanding shares. It is often considered as a key indicator of what a company is worth.