Top Analyst Upgrades & Downgrades (AONE, ACM, ALXN, AEP, LFC, CLNE, COP, CVA, CREE, ENOC, FXCM, IRM, MET, NYX, PCLN, SD, LEDS, VLO, WFSL)

These are some of the top analyst upgrades, downgrades, and initiations seen from Wall Street research calls this Tuesday morning.

A123 Systems, Inc. (NASDAQ: AONE) Raised to Buy at BofA/ML.
AECOM Technology Corporation (NYSE: ACM) Raised to Buy at Argus.
Alexion Pharmaceuticals, Inc. (NASDAQ: ALXN) Kept at Buy but Removed from Conviction Buy List at Goldman Sachs.
American Electric Power Co., Inc. (NYSE: AEP) Raised to Buy at BofA/ML.
China Life Insurance Co. Ltd. (NYSE: LFC) Raised to Neutral at Credit Suisse.
Clean Energy Fuels Corp. (NASDAQ: CLNE) Cut to Underperform at BofA/ML.
ConocoPhillips (NYSE: COP) Reiterated Buy and $95 target at Argus.
Covanta Holding Corporation (NYSE: CVA) Raised to Buy at BofA/ML.
Cree Inc. (NASDAQ: CREE) Cut to Underperform at BofA/ML.
EnerNOC, Inc. (NASDAQ: ENOC) Cut to Underperform at BofA/ML.
FXCM Inc. (NYSE: FXCM) Cut to Sell at Citigroup.
Iron Mountain Inc. (NYSE: IRM) Started as Buy at Stifel Nicolaus.
MetLife Inc. (NYSE: MET) Reiterated Buy with $54 target at Argus.
NYSE Euronext Inc. (NYSE: NYX) Cut to Hold at Argus.
Priceline.com Inc. (NASDAQ: PCLN) Maintained Outperform as Bull of the Day at Zacks.
SandRidge Energy, Inc. (NYSE: SD) Started as Neutral at Baird; Started as Outperform at Morgan Keegan.
SemiLEDS Corporation (NASDAQ: LEDS) Cut to Underperform at BofA/ML.
Valero Energy Corporation (NYSE: VLO) Maintained Strong Buy as Value at Zacks.

Washington Federal Inc. (NASDAQ: WFSL) Cut to Underperform as Bear of the Day at Zacks.

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JON C. OGG