Exxon Mobil Corp unseated Wal-Mart Stores Inc in the 2009 Fortune 500 list, shrugging off the oil price bubble and weathering what the magazine called the worst year ever for the country's largest publicly traded companies.

Fortune's closely watched list ranked companies by their revenue in 2008. Irving, Texas-based Exxon took in $442.85 billion in revenue last year, up almost 19 percent from 2007. The company also raked in the biggest annual profit, earning $45.2 billion.

Bentonville, Arkansas-based Wal-Mart had held the top spot for six of the last seven years but fell to No 2 this year. Still, the retail giant's 2008 revenue climbed 7 percent to $405.6 billion, as the battered economy sent more consumers searching for bargains. The world's largest retailer took in $13.4 billion in annual profit, an increase of about 5 percent.