About White Cliffs PipelineWhite Cliffs Pipeline ®, L.L.C. is a partially owned subsidiary of SemGroup® Corporation and is operated by Rose Rock Midstream, L.P. Partial ownership is also held by Samedan Pipe Line Corporation ("Noble Energy"); Anadarko Wattenberg Company, LLC, a subsidiary of Western Gas Partners, LP ("AWC"); and Plains Pipeline, L.P. White Cliffs Pipeline originates in Platteville, CO, northeast of Denver, and terminates at Rose Rock Midstream's storage facility in Cushing, OK. White Cliffs Pipeline, a 526-mile, 12-inch common carrier, crude oil pipeline is the only pipeline that directly moves crude oil out of the DJ Basin to the Cushing market and ultimately to refiners in the Mid-Continent area. The White Cliffs Pipeline Logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=14820 About SemGroup Based in Tulsa, Oklahoma, 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. SemGroup® and White Cliffs Pipeline ® are registered trademarks of SemGroup Corporation. About Rose Rock Midstream Rose Rock Midstream, L.P. (NYSE:RRMS) is a growth-oriented Delaware limited partnership recently formed by SemGroup® Corporation 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 different states with the majority of its assets strategically located in or connected to the Cushing, Oklahoma crude oil marketing hub. Forward-Looking Statements Certain matters contained in this Press Release include "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995.