Fortune 500 rank: 33
Another refiner on our list, Marathon Petroleum was spun off from Marathon Oil Corp. in June 2011 and quickly showed results with a 25% increase in its first-quarter dividend. Benefitting from low crude oil prices that helped boost margins, the company's 2012 revenues rose 6.5%, with analysts predicting healthy long-term earnings growth of 7%. With a strong balance sheet and plenty of free cash, Marathon Petroleum remains an attractive value proposition for investors.
Wal-Mart retook the top spot, Berkshire Hathaway made the top five, and Apple grew enormously.