Filed under: Analyst Reports , Analyst Upgrades and Downgrades , Apple Inc (AAPL) , Amazon.com (AMZN) , Nokia Corp. (NOK) , BP p.l.c. ADS (BP) , Lockheed Martin (LMT) , Analyst Initiations , Rio Tinto plc ADS (RTP) Analyst Upgrades Collins Stewart upgraded BP ( BP ) to buy from hold after the company canceled its dividend payments and agreed to put $20 billion in a claims escrow fund

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