Cubist Pharmaceuticals (CBST -3.1%) falls after Cantor Fitzgerald says the company's development...

|By:, SA News Editor

Cubist Pharmaceuticals (CBST -3.1%) falls after Cantor Fitzgerald says the company's development of a competing product indicates it likely isn't preparing to bid for Optimer Pharmaceuticals (OPTR +0.1%). Analyst Irina Rivkind downgraded the stock to Sell Wednesday. (See: Optimer surges on takeover chatter)