Advanced Micro Devices
fortune 500 stock losers amd
Fortune 500 rank: 464
2012 revenue: $5.4 bil
2012 total return: -55.6%

AMD has trailed Intel for years in the chip wars. But now that PC sales are turning downward, AMD may be even more vulnerable. The computer industry is undergoing its worst period of the last 20 years and AMD's processors aren't in demand.

The No. 2 company in any industry always hurts more in a slowdown because it enjoys fewer economies of scale. The problem multiplies for AMD because its tablet processor sales aren't anywhere close to filling the hole left by PCs. AMD lost $1.2 billion last year and shares fell by 56%.

  @FortuneMagazine - Last updated May 06 2013 06:58 AM ET
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Wal-Mart retook the top spot, Berkshire Hathaway made the top five, and Apple grew enormously.

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