NEW YORK--(BUSINESS WIRE)--Notice is hereby given that a securities class action lawsuit (Case No. 1:15-cv-04513) has been filed in the United States District Court for the Northern District of Illinois (the “Court”) on behalf of a putative class (the “Class”) of Catamaran Corporation (“Catamaran” or the “Company”) (NASDAQ:CTRX) stockholders that will be asked to vote upon the Company’s proposed sale (the “Proposed Transaction”) to UnitedHealth Group Incorporated (“UnitedHealth”) for $61.50 per