Amgen (AMGN) (TC) (VOC) (ZQK) (AKS) (ATHN) Upgrade

Amgen, Inc. (NASDAQ: AMGN), Thompson Creek Metals Co. Inc. (NYSE: TC), VOC Energy Trust (NYSE: VOC), Quiksilver, Inc. (NYSE: ZQK), AK Steel Holding Co. (NYSE: AKS) and AthenaHealth (NASDAQ: ATHN) were upgraded by analysts.

Thompson Creek Metals Co. Inc. (TC) was upgraded by JPMorgan Chase & Co. (NYSE:JPM) from a “Neutral” rating to an “Overweight” rating.

VOC Energy Trust (VOC) was upgraded by Robert W. Baird from a “Neutral” rating to an “Outperform” rating.

Quiksilver, Inc. (ZQK) was upgraded by DA Davidson from a “Neutral” rating to a “Buy” rating.

AK Steel Holding Co. (AKS) was upgraded by Wells Fargo & Co. (NYSE:WFC) from a “Market Perform” rating to an “Outperform” rating.

Amgen, Inc. (AMGN) was upgraded by Goldman Sachs (NYSE:GS) from a “Sell” rating to a “Neutral” rating.

AthenaHealth (ATHN) was upgraded by Oppenheimer from an “Underperform” rating to a “Market Perform” rating.