Benzinga's Top Upgrades

Piper Jaffray upgraded Sprint Nextel Corp

from “neutral” to “overweight.” Sprint Nextel's shares closed at $5.33 yesterday. Sprint Nextel's trailing-twelve-month revenue is $32.79 billion. Analysts at Citigroup upgraded AES Corporation

from “hold” to “buy.” AES' shares closed at $12.93 yesterday. AES' PEG ratio is 1.02. Citadel Securities upgraded United Therapeutics Corporation

from “neutral” to “add.” UTHR's shares closed at $65.27 yesterday. United Therapeutics' PEG ratio is 0.69. Analysts at KeyBanc upgraded Tyson Foods

from “hold” to “buy.” TSN's shares closed at $18.56 yesterday. Tyson Foods' trailing-twelve-month revenue is $30.49 billion.