Top 50 Wal-Mart's on top. Which other companies made the top 50 this year? (more)
Best big companies to work for See more than 30 companies that made both the Fortune 1000 and Best Companies to Work For lists this year. (more)
20 best investments These 20 stocks offered some of the best returns to shareholders last year. Will they keep rising? (more)
19 of 20
19. Avis Budget Group
Fortune 500 rank: 411
2007 loss: $916 million

The global leader in the auto rental market is still trying to emerge from the broken-up Cendant conglomerate in one piece. Rental revenues were up last year, despite a tough leisure travel environment. But costs rose thanks to a $1.2 billion loss in the value of its brands and higher prices for cars charged by Detroit's Big Three.

The company aims to grow its off-airport rentals to better compete with Enterprise, its biggest competitor.

Last updated April 24 2008: 11:01 AM ET