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

Alcoa Inc. (NYSE: AA) Reiterated Buy at Argus.
Berkshire Hathaway Inc. (NYSE: BRK-B) named as Bull of the Day with Outperform rating at Zacks.
Carnival Corp. (NYSE: CCL) Reiterated Hold at Argus.
Copart, Inc. (NASDAQ: CPRT) Started as Buy at BofA/ML.
DuPont (NYSE: DD) Reiterated Buy and raised $62 target at BofA/ML.
Exxon Mobil Corporation (NYSE: XOM) Reiterated Buy with $100 target at Argus.
GSI Commerce, Inc. (NASDAQ: GSIC) removed from coverage at BofA/ML.
Hudson City Bancorp, Inc. (NASDAQ: HCBK) Raised to Neutral at BofA/ML.
Marriott International (NYSE: MAR) Raised to Outperform at Wells Fargo.
Owens-Illinois, Inc. (NYSE: OI) Raised to Outperform with $36 target at Credit Suisse.
Quest Diagnostics Inc. (NYSE: DGX) Raised to Outperform with $65 target at Credit Suisse.
The Travelers Companies, Inc. (NYSE: TRV) Cut to Sell at Goldman Sachs.
Teekay Tankers Ltd. (NYSE: TNK) Raised to Buy at BofA/ML.
Universal Technical Institute (NYSE: UTI) Maintained Underperform as Bear of the Day at Zacks.
Walgreen Co. (NYSE: WAG) Raised to Outperform with $36 target at Credit Suisse.
XL Group plc (NYSE: XL) Raised to Buy at Goldman Sachs.  

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JON C. OGG