Depends on your definition of "largest company". Revenue is one metric. Market cap is another. https://en.wikipedia.org/wiki/List_of_public_corporations_by_mar

Depends on your definition of "largest company". Revenue is one metric. Market cap is another. https://en.wikipedia.org/wiki/List_of_public_corporations_by_market_capitalization#2017 https://en.wikipedia.org/wiki/List_of_public_corporations_by... 1. Apple 2. Alphabet 3. Microsoft 4. Amazon 5. Berkshire Hathaway