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

Baidu.com (NASDAQ: BIDU) Raised to Overweight at HSBC.
Charles River Labs (NYSE: CRL) Raised to Hold at S&P Equity Research (late-Wednesday).
Chesapeake Energy Corp. (NYSE: CHK) Raised to Hold at Argus.
Cisco Systems, Inc. (NASDAQ: CSCO) Cut to Hold at Citigroup.
Computer Sciences Corporation (NYSE: CSC) Cut to Hold at S&P Equity Research (late-Wednesday).
Energy Conversion Devices, Inc. (NASDAQ: ENER) Cut to Sell at Citigroup.
Humana Inc. (NYSE: HUM) Cut to Perform at Oppenheimer.
Intrepid Potash, Inc. (NYSE: IPI) Cut to Market Perform at BMO.
ITT Corporation (NYSE: ITT) Cut to Underweight at Morgan Stanley.
Johnson Controls Inc. (NYSE: JCI) Raised to Outperform as the Bull of the Day at Zacks Investment Research.
NYSE Euronext, Inc. (NYSE: NYX) Cut removed from Conviction Buy List at Goldman Sachs; Cut to Sell at S&P Equity Research (late-Wednesday).
Polo Ralph Lauren Corp. (NYSE: RL) Raised to Neutral at BofA/ML; On Credit Suisse focus list and target raised to $150.
Wal-Mart Stores, Inc. (NYSE: WMT) Cut to Neutral at UBS.

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JON C. OGG