The data represents the market capitalization of the leading four coal companies worldwide (based on stock performance) as of April 2018. At that time, Australia's BHP Billiton had a market capitalization of some 115.2 billion USD.
BHP Billiton (Australia) | 115.18 |
Rio Tinto (United Kingdom) | 85.11 |
South32 Limited (Australia) | 12.7 |
Cloud Peak Energy Inc. (United States) | 0.23 |