These are some of the top analyst upgrades, downgrades and initiations seen in Wall St. research calls this Monday.

Air Products & Chemicals Inc. (NYSE: APD) raised to Buy at Goldman Sachs.

Berry Plastics Group Inc. (NYSE: BERY) started as Buy at Goldman Sachs.

Colgate-Palmolive Co. (NYSE: CL) reiterated Buy and Focus List with $118 target at Argus.

Crexus Investment Corp. (NYSE: CXS) cut to Neutral at JPMorgan and cut to Hold at Deutsche Bank..

Dow Chemical Co. (NYSE: DOW) raised to Buy at Goldman Sachs.

F5 Networks Inc. (NASDAQ: FFIV) raised to Buy at Goldman Sachs.

Fresenius Medical Care A.G. (NYSE: FMS) raised to Conviction Buy List at Goldman Sachs.

ImmunoGen Inc. (NASDAQ: IMGN) started as Equal Weight at Morgan Stanley.

LeapFrog Enterprises Inc. (NYSE: LF) named as Value stock of the day at Zacks.

Molycorp Inc. (NYSE: MCP) cut to Equal Weight at Morgan Stanley.

NuStar Energy L.P. (NYSE: NS) raised to Neutral at Credit Suisse.

Omnicom Group Inc. (NYSE: OMC) reiterated Buy with $56 target at Argus.

PDL BioPharma (NASDAQ: PDLI) started as Neutral at Credit Suisse.

Regeneron Pharmaceuticals Inc. (NASDAQ: REGN) started as Outperform at Credit Suisse.

Seattle Genetics Inc. (NASDAQ: SGEN) Started as Outperform at Credit Suisse.

Western Union Co. (NYSE: WU) cut to Underperform as Bear of the Day at Zacks.

Weyerhaeuser Co. (NYSE: WY) raised to Outperform as Bull of the Day at Zacks.

XOMA Corp. (NASDAQ: XOMA) started as Outperform at Credit Suisse.

JON C. OGG