Exxon Mobil once again reigned supreme on the top of Fortune 500’s list of the most profitable companies for 2009. Exxon Mobile which was 2007’s top earner but fell to second spot in 2008, regained its position by beating Wal-Mart Stores. Other oil refiners joining them at the top 10 are Chevron (3), ConocoPhillips(4), Valero Energy(10) and Marathon Oil(23). All five of them have also been able to improve their standing as compared to their previous position in 2008’s list.
The 
