LEXINGTON, Mass.--(BUSINESS WIRE)--Cubist Pharmaceuticals, Inc. (NASDAQ: CBST) announced today that it has completed its acquisition of Optimer Pharmaceuticals, Inc. (NASDAQ: OPTR) for an aggregate upfront cash consideration of approximately $551 million. Optimer stockholders approved the merger agreement at a special meeting of stockholders held on October 23, 2013. Effective today, Optimer common stock will cease to be traded on the NASDAQ.
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