In connection with the transaction, Rose Rock Midstream exercised the accordion on its revolving credit agreement which increased the total borrowing capacity from $150 million to $385 million.The terms of the acquisition were approved by the Conflicts Committee of the Board of Directors of Rose Rock Midstream's general partner. The Conflicts Committee engaged Evercore Partners to act as its independent financial advisor and to render a fairness opinion, and Akin Gump Strauss Hauer & Feld, LLP to act as its legal advisor. LCT Capital, LLC and Citi acted as financial advisors to SemGroup on the transaction. 2013 Adjusted EBITDA and Capex Guidance Rose Rock Midstream expects 2013 Adjusted EBITDA of $56 million to $60 million; capital expenditures of $60 million, including $4 million for maintenance; and a target distribution growth rate of 10 to 15 percent year-over-year. About Rose Rock Midstream Rose Rock Midstream, L.P. (NYSE:RRMS) is a growth-oriented Delaware limited partnership formed by SemGroup® Corporation (NYSE:SEMG) to own, operate, develop and acquire a diversified portfolio of midstream energy assets. Rose Rock Midstream provides crude oil gathering, transportation, storage and marketing services. Headquartered in Tulsa, OK, Rose Rock Midstream has operations in six states with the majority of its assets strategically located in or connected to the Cushing, Oklahoma crude oil marketing hub. The Rose Rock Midstream logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=14817 About SemGroup Based in Tulsa, OK, SemGroup® Corporation (NYSE:SEMG) is a publicly traded midstream service company providing the energy industry the means to move products from the wellhead to the wholesale marketplace. SemGroup provides diversified services for end-users and consumers of crude oil, natural gas, natural gas liquids, refined products and asphalt. Services include purchasing, selling, processing, transporting, terminalling and storing energy. Non-GAAP Financial Measures This Press Release and the accompanying schedules include the non-GAAP financial measure of Adjusted EBITDA, which may be used periodically by management when discussing our financial results with investors and analysts. The accompanying schedule of this Press Release provides a reconciliation of this non-GAAP financial measure to its most directly comparable financial measures calculated and presented in accordance with generally accepted accounting principles in the United States of America (GAAP). Adjusted EBITDA is presented as management believes it provides additional information and metric relative to the performance of our business.