Federman & Sherwood Announces That a Securities Class Action Lawsuit Has Been Filed Against Oklahoma-Based SemGroup Energy Partners, L.P. (NASDAQ: SGLP)

OKLAHOMA CITY, OK--(Marketwire - July 21, 2008) - On July 21, 2008, a class action lawsuit was filed in the United States District Court for the Southern District of New York against Oklahoma-based SemGroup Energy Partners, L.P. (NASDAQ: SGLP). The complaint alleges that the parent company of SemGroup Energy Partners, L.P. (SemGroup, L.P.) failed to disclose its financial difficulties or high risk for financial problems associated with its risky crude oil hedge transactions by the start of the class period, and then hiding this information from investors in SGLP. The complaint alleges violations of federal securities laws, Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5. The class period is for those investors who purchased common units of SGLP from February 20, 2008 through July 17, 2008. Federman & Sherwood is an Oklahoma-based law firm that has over 25 years' experience in securities and complex litigation.

Plaintiff seeks to recover damages on behalf of the Class. If you are a member of the Class as described above, you may move the Court no later than September 19, 2008 to serve as a lead plaintiff for the Class. However, in order to do so, you must meet certain legal requirements pursuant to the Private Securities Litigation Reform Act of 1995.

If you wish to discuss this action, participate in this or any other lawsuit, or have any questions or concerns regarding this notice, or preservation of your rights, please contact:

Contact Information: William B. Federman Federman & Sherwood 10205 North Pennsylvania Avenue Oklahoma City, OK 73120 Email to: wfederman@aol.com www.federmanlaw.com