1. Exxon Mobil The oil giant racked up $39.5 billion in earnings last year, the largest-ever profit in U.S. history. That figure topped the previous record of $36.1 billion, also set by Exxon Mobil, in 2005. Profits were up 9.3% from the previous year, while sales rose 2.2%. |  Wal-Mart retakes the No. 1 slot on the Fortune 500 this year. See where America's largest corporations rank, and why. (more)  See the 37 companies that made both the Fortune 1000 and Best Companies to Work For lists this year. (more) |
