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)
18 of 20
18. Virgin Media
Fortune 500 rank: 313
2007 loss: $927.6 million

Virgin Media was created last year after a U.S.-based cable company bought Richard Branson's Virgin Mobile, the U.K.'s largest mobile services provider. Branson's Virgin Group is the largest shareholder of the new company, which offers a package of cable, broadband, landline phone, and mobile to U.K. customers, and has seen subscriptions rise in the past year.

But a heavy debt load and a fierce price war in the U.K. have produced a string of big losses. It's a rumored target of private equity heavyweights like Blackstone and KKR.

NEXT: Avis Budget Group
Last updated April 24 2008: 11:01 AM ET