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Top Analyst Upgrades and Downgrades: Amazon, Brightcove, Exxon, GM, Mylan, Petrobras, Twitter and Many More

General Motors Co. (NYSE: GM) was downgraded to Hold from Buy at Deutsche Bank.

Mylan Inc. (NASDAQ: MYL) was downgraded to Neutral from Buy at Citigroup.

Netgear Inc. (NASDAQ: NTGR) was downgraded to Market Perform from Outperform at Raymond James.

Northern Trust Corp. (NASDAQ: NTRS) was raised to Neutral from Underweight at J.P. Morgan.

Overstock.com Inc. (NASDAQ: OSTK) was raised to Buy from Neutral with a $22 price target (versus a $16.19 close) at B. Riley.

Patterson-UTI Energy Inc. (NASDAQ: PTEN) was raised to Outperform at Raymond James.

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Petróleo Brasileiro S.A. (NYSE: PBR), or Petrobras, was raised to Overweight from Equal Weight at Barclays.

Precision Castparts Corp. (NYSE: PCP) was maintained as Buy at Goldman Sachs, but the company was removed from the firm’s prized Conviction Buy List. Canaccord Genuity maintained a Buy rating but lowered its price target to $280 from $300.

Questcor Pharmaceuticals Inc. (NASDAQ: QCOR) was downgraded to Market Perform from Outperform at Oppenheimer.

Starwood Hotels & Resorts Worldwide Inc. (NYSE: HOT) already fell more than 5% on Thursday after earnings. The stock was downgraded to Market Perform from Outperform at Wells Fargo.

Twitter Inc. (NYSE: TWTR) was started with a Market Perform rating at Raymond James in coverage issued late on Thursday.

VeriSign Inc. (NASDAQ: VRSN) was raised to Neutral from Sell at Citigroup.

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In case you missed Thursday’s top analyst upgrades and downgrades, they included Boeing, Facebook, Markit, Qualcomm, Verizon, Unisys and a dozen others.