For more than 50 years, Fortune Magazine has been ranking America's biggest corporations. The Fortune 500 is more than just a list, it's a symbol for money, power and prestige. Topping this list for the second year in a row is Wal-Mart. Also on the list are a number of oil companies, including ConocoPhillips and … Continue reading Wal-Mart tops Fortune's list of 500 largest corporations