For a company to reach a worth of one billion dollars is a feat, but very few have ever been able to reach $500 billion. The companies listed below have all crossed the $500 billion mark at least once in their history. Though most are now worth less, they should still be recognized as having been worth over 500 billion at one point.
list ordered by
Exxon Mobil Petroleum industry, Crude Petroleum and Natural Gas Extraction, Natural gas
Cisco Systems, Inc. Telecommunications equipment, Optical Networks Equipment, Networking hardware
Microsoft Corporation Consumer electronics, Software, Publishing
Intel Semiconductor and Other Electronic Component Manufacturing
General Electric Motion Picture and Video Production, Electrical and electronic equipment, Home appliance