Among the stock activity stories for Monday, Feb. 25, from AP Business News:

— Shares of Universal Display Corp. dropped after a Piper Jaffray analyst cut his earnings estimates, saying the supplier of materials used in smartphone displays faces new challenges in its relationship with Samsung.

— Shares of Amgen Inc. rose after a drug that competes with Amgen's anemia treatment Aranesp and Epogen was taken off the market because of severe allergic reactions and deaths in some patients.

 

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