Walmart named biggest US company on Fortune 500 list
Retail giant Walmart has topped Fortune's annual list of America's top 500 companies for the fifth consecutive year with a revenue of $485.8 billion. Warren Buffett's Berkshire Hathaway emerged at the second position on the list followed by tech giant Apple. Notably, the list has been a measure of US' most valuable businesses since it first came out in 1955. 