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

Changyou.com Ltd. (NASDAQ: CYOU) started as Buy at Citigroup.

Eastman Chemical Co. (NYSE: EMN) named Bull of the Day at Zacks.

Elan PLC (NYSE: ELN) raised to Buy at UBS.

Expedia Inc. (NASDAQ: EXPE) cut to Hold at Stifel Nicolaus.

GlaxoSmithKline PLC (NYSE: GSK) named Bear of the Day at Zacks.

Groupon Inc. (NASDAQ: GRPN) cut to Neutral at Citigroup.

Kayak Software Corp. (NASDAQ: KYAK) started as Buy at Deutsche Bank, started as Neutral at Piper Jaffray and started as Hold at Stifel Nicolaus.

Molycorp Inc. (NYSE: MCP) started as Overweight at Morgan Stanley. S&P downgraded the corporate credit rating late on Monday before the close.

OfficeMax Inc. (NYSE: OMX) named value stock of the day at Zacks.

Palo Alto Networks Inc. (NYSE: PANW) started as Outperform at Credit Suisse, started as Neutral at Citi, started as Buy at Goldman Sachs and started as Equal Weight at Morgan Stanley.

Sealy Corp. (NYSE: ZZ) started as Underweight at Barclays.

Select Comfort Corp. (NASDAQ: SCSS) started as Overweight at Barclays.

Southwest Airlines Co. (NYSE: LUV) raised to Neutral at BofA/ML.

Vale S.A. (NYSE: VALE) cut to Neutral at BofA/ML.

The Wendy’s Company (NASDAQ: WEN) cut to Underweight at KeyBanc Capital Markets.

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