Fortune 500 rank: 150
2010 revenue: $17.1 billion
10-year annualized return: -14.1%
Shares of the power producer and utility were hammered in the early 2000's when Enron collapsed. While AES didn't share in the infamous energy giant's trading woes, widespread concern about the entire sector's liquidity issues sent investors running.
The exodus continued in 2002 when AES posted massive losses as it raced to shed its assets in crisis-stricken Latin America and improve its precarious debt position. The company spent the next few years bolstering its balance sheet, but its earnings dipped again during the recent recession.
NEXT: 12. Tenet Healthcare
Last updated May 05 2011: 2:52 PM ET