June 3, 2015 (San Diego, CA & Schaumburg, IL) Shareholder rights law firm Robbins LLP announces that it filed a class action lawsuit on June 3, 2015, in the U.S. District Court for the Northern District of Illinois, Eastern Division (the "Court") on behalf of the shareholders of Catamaran Corporation ("Catamaran") (NASDAQGS: CTRX) against Catamaran and its Board of Directors (the "Board") for, among other things, violations of sections 14(a) and 20(a) of the Securities and Exchange Act of 1934 (the "Exchange Act") and U.S. Securities and Exchange Commission Rule 14a-9 promulgated thereunder.

Catamaran Is Accused of Disseminating a False and Misleading Proxy Statement

The complaint arises out of a March 30, 2015 press release announcing that Catamaran had entered into a definitive merger agreement with UnitedHealth Group Incorporated ("UnitedHealth") pursuant to which Catamaran's Board agreed to sell Catamaran to UnitedHealth for $61.50 in cash per Catamaran share (the "Proposed Transaction"). The complaint seeks injunctive relief on behalf of the named plaintiff and all other similarly situated shareholders of Catamaran (the "Class"). The named plaintiff is represented by Robbins LLP.

The complaint alleges that, in an attempt to secure shareholder approval of the Proposed Transaction, the defendants filed a materially false and misleading Proxy Statement with the U.S. Securities and Exchange Commission in violation of the Exchange Act. The omitted and/or misrepresented information is believed to be material to Catamaran's shareholders' ability to make an informed decision whether to approve the Proposed Transaction.

If you purchased or otherwise acquired Catamaran stock prior to the announcement of the Proposed Transaction on March 30, 2015, and wish to serve as lead plaintiff, you must move the Court no later than sixty days from June 3, 2015.

If you wish to discuss this action or have any questions concerning this notice or your rights or interests, please contact attorney Darnell R. Donahue of Robbins LLP at 800-350-6003, or you can complete the form below and we will contact you directly.