Top Analyst Upgrades & Downgrades (ABT, ABAT, AMZN, BAC, GNOM, ELX, GCI, HAL, MJN, NAV, NLSN, TSCO, YRCW, HCA)

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

Abbott Laboratories (NYSE: ABT) Maintained Hold but cut estimates at Argus.
Advanced Battery Technologies, Inc. (NASDAQ: ABAT) Cut to Market Perform at Rodman & Renshaw.
Amazon.com inc. (NASDAQ: AMZN) Maintained Neutral at Credit Suisse.
Bank of America Corporation (NYSE: BAC) Reiterated Hold at Argus.
Complete Genomics, Inc. (NASDAQ: GNOM) Cut to Neutral at UBS.
Emulex Corporation (NYSE: ELX) Raised to Hold at S&P Equity Research (late-Monday).
Gannett Co. Inc. (NYSE: GCI) Maintained Hold but cut 2011 targets and raised 2012 targets at Argus.
Halliburton Company (NYSE: HAL) Reiterated Buy and Raised estimates at Jefferies.
Mead Johnson Nutrition Company (NYSE: MJN) Raised to Outperform at Credit Suisse.
Navistar International Corp. (NYSE: NAV) Raised to Neutral at JPMorgan.
Nielsen Holdings B.V. (NYSE: NLSN) Started as Outperform at Credit Suisse.
Tractor Supply Co. (NASDAQ: TSCO) kept as Outperform as Bull of the Day at Zacks.
YRC Worldwide Inc. (NASDAQ: YRCW) Cut to Underperform as Bear of the Day at Zacks.

HCA Holdings Inc. (NYSE: HCA) has come off its so-called quiet period and analysts have initiated their coverage on the stock: Started as Buy at Goldman Sachs; Started as Buy at Citigroup; Started as Outperform at Credit Suisse; Started as Outperform at RBC; Started as Buy at BofA/Ml; Started as Overweight at JPMorgan; Started as Overweight at Barclays.

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JON C. OGG