Coughlin Stoia Geller Rudman & Robbins LLP Files Class Action Suit against SemGroup Energy Partners, L.P.

Coughlin Stoia Geller Rudman & Robbins LLP (“Coughlin Stoia”) (http://www.csgrr.com/cases/semgroup/) today announced that a class action has been commenced in the United States District Court for the Southern District of New York on behalf of purchasers of SemGroup Energy Partners, L.P. (“SGLP”) (NASDAQ:SGLP) common units during the period between July 17, 2007 and July 17, 2008 (the “Class Period”), and on behalf of purchasers of SGLP’s common units acquired pursuant and/or traceable to the Registration Statement and Prospectus issued in connection with SGLP’s Initial Public Offering completed on or about July 23, 2007 (“IPO”), as well as all purchasers of SGLP common units acquired pursuant and/or traceable to the Registration Statement and Prospectus issued in connection with SGLP’s secondary offering completed on or about February 20, 2008 (“Secondary Offering”).

If you wish to serve as lead plaintiff, you must move the Court no later than 60 days from July 21, 2008. If you wish to discuss this action or have any questions concerning this notice or your rights or interests, please contact plaintiff’s counsel, Darren Robbins of Coughlin Stoia at 800/449-4900 or 619/231-1058, or via e-mail at djr@csgrr.com. If you are a member of this class, you can view a copy of the complaint as filed or join this class action online at http://www.csgrr.com/cases/semgroup/. Any member of the putative class may move the Court to serve as lead plaintiff through counsel of their choice, or may choose to do nothing and remain an absent class member.

The complaint charges the defendants with violations of the Securities Exchange Act of 1934 and the Securities Act of 1933. SGLP owns and operates a diversified portfolio of midstream energy assets, including storage facilities, terminals and pipelines in the United States.

The complaint alleges that the Registration Statements and Prospectuses issued in connection with the IPO and Secondary Offering were materially false and misleading, and/or omitted material information necessary to make the statements made, in light of such material omissions, not materially false and misleading. In addition, during the Class Period, a continuous course of conduct was undertaken that operated as a fraud and deceit upon plaintiff and the Class. Various untrue and/or misleading statements of material facts were made, and material facts necessary in order to make the statements made not misleading, were omitted.

According to the complaint, the Registration Statements and Prospectuses issued in connection with the IPO and Secondary Offering and the statements made during the Class Period failed to disclose the adverse financial condition and lack of liquidity of SemGroup L.P. (SGLP’s Parent, from whom SGLP derives more than 80% of its revenue) as a result of its speculative, dangerous and unauthorized hedging and trading in crude oil.

Plaintiff seeks to recover damages on behalf of all purchasers of SGLP common units during the Class Period and all purchasers of SGLP common units acquired pursuant and/or traceable to SGLP’s IPO and Secondary Offering Registration Statements and Prospectuses. The plaintiff is represented by Coughlin Stoia, which has expertise in prosecuting investor class actions and extensive experience in actions involving financial fraud.

Coughlin Stoia, a 190-lawyer firm with offices in San Diego, San Francisco, Los Angeles, New York, Boca Raton, Washington, D.C., Philadelphia and Atlanta, is active in major litigations pending in federal and state courts throughout the United States and has taken a leading role in many important actions on behalf of defrauded investors, consumers, and companies, as well as victims of human rights violations. The Coughlin Stoia Web site (http://www.csgrr.com) has more information about the firm.