BHP Billiton is an Anglo-Australian multinational mining, metals and petroleum company headquartered in Melbourne, Australia. It is the world's largest mining company measured by 2015 market values and Australia's fourth largest company (by revenue), formerly the largest.
BHP Billiton was created in 2001 through the merger of the Australian Broken Hill Proprietary Company Limited (BHP) and the Anglo–Dutch Billiton plc. The result is a dual-listed company. The Australia-registered BHP Billiton Limited, which has equal financial share in the company, has a primary listing on the Australian Securities Exchange and is one of the largest companies in Australia measured by market capitalisation.