10 of 20
10. CBS
Fortune 500 rank: 186
Loss: $11.7 billion

Though the Tiffany network may be No. 1 in the ratings these days, its parent was far from immune to the wasting disease ravaging media stocks. Despite buying online tech news site CNET.com, CBS saw a significant decline in the value of its businesses, especially its ownership of local CBS-affiliate TV stations. It took a $10 billion loss on the value of those stations thanks to another year of double-digit declines in advertising revenue.

Profits in the publishing division fell too, as the company failed to produce a hit as big as last year's "The Secret" from Simon & Schuster. Radio also saw operating income fall by a third as CBS sold off stations in non-core markets like Denver and Seattle.

The biggest loser of all might be Sumner Redstone, whose family company still owns a controlling interest in CBS - a mixed blessing in a year when quarterly dividends got slashed 81%.

NEXT: Freeport-McMoRan Copper & Gold
Last updated April 21 2009: 3:34 PM ET
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