BALTIMORE, MD–(EMWNews – July 28, 2008) – Brower Piven, A Professional Corporation

announces that a class action lawsuit has been commenced in the United

States District Court for the Southern District of New York on behalf of

purchasers of the common units of SemGroup Energy Partners, L.P.

(“SemGroup” or the “Company”) (NASDAQ: SGLP) between February 20, 2008 and

July 17, 2008, inclusive (the “Class Period”).

No class has yet been certified in the above action. Members of the Class

will be represented by the lead plaintiff and counsel chosen by the lead

plaintiff. If you wish to choose counsel to represent you and the Class,

you must apply to be appointed lead plaintiff no later than September 19,

2008 and be selected by the Court. The lead plaintiff will direct the

litigation and participate in important decisions including whether to

accept a settlement and how much of a settlement to accept for the Class in

the action. The lead plaintiff will be selected from among applicants

claiming the largest loss from investment in the Company during the Class

Period. You may contact Brower Piven (through [email protected] or

410/332-0030) to answer any questions you may have in that regard.

The complaint alleges that SGLP’s parent SemGroup, L.P. was in financial

difficulty or at high risk for such financial difficulty as a result of its

investment in risky crude oil hedge transactions by the start of the class

period, but hid this from investors in SGLP and, on or about February 20,

2008, SGLP effected a secondary offering, (the “Offering”) where it sold 6

million units at $23.90 for proceeds of $137 million. It is also alleged in

the complaint that the Company also borrowed substantial funds and

purchased the Parent’s asphalt business for $387 million, a transaction

designed to financially prop up the Parent. The complaint further alleges

that while the Prospectus for the Offering described the positive

relationship between SGLP and the Parent, and further described how

important the Parent was to SGLP since it was SGLP’s primary customer and

provided almost all of the Company’s revenue, there was no discussion of

the Parent’s financial difficulties or risk factors.

The allegations include that in the period following the Offering, SGLP

units traded in the $24-27 range reflecting that, as far as the investing

public was aware, the Company was operating according to its business plan.

The complaint further alleges that by July 11, 2008, SGLP unit values began

to decline on increased trading volume despite the release of no adverse

news and that on July 17, 2007, SGLP unit prices declined 50% to $11.00 on

greatly increased volume of 5.7 million units, after material adverse news

which had been withheld by defendants began to leak, thus forcing the

defendants to issue a statement after the market closed on July 17, 2008

revealing that the Parent was experiencing liquidity issues and was

exploring various alternatives, including raising additional equity, debt

capital or the filing of a voluntary petition for reorganization under

Chapter 11 of the Bankruptcy Code. The complaint indicates that as a

result, the price of the Company’s units continued to decline, wiping out

almost $300 million in unit holder value.

If you have suffered a net loss for all transactions in SemGroup Energy

Partners, L.P. common units during the Class Period, you may obtain

additional information about this lawsuit and your ability to become a lead

plaintiff by contacting Brower Piven at www.browerpiven.com, by email at

[email protected], by calling 410-332-0030, or at Brower Piven, A

Professional Corporation, The World Trade Center-Baltimore, 401 East Pratt

Street, Suite 2525, Baltimore, Maryland 21202. Attorneys at Brower Piven

have combined experience litigating securities and class action cases of

over 40 years. If you choose to retain counsel, you may retain Brower Piven

without financial obligation or cost to you, or you may retain other

counsel of your choice. You need take no action at this time to be a member

of the class.