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®, is a registered trademark of SemGroup Corporation.

The SemGroup Corporation logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=14815

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.

About Chesapeake Energy Corporation

Chesapeake Energy Corporation (NYSE:CHK) is the second-largest producer of natural gas, a Top 15 producer of oil and natural gas liquids and the most active driller of new wells in the U.S. Headquartered in Oklahoma City, the company's operations are focused on discovering and developing unconventional natural gas and oil fields onshore in the U.S. Chesapeake owns leading positions in the Eagle Ford, Utica, Granite Wash, Cleveland, Tonkawa, Mississippi Lime and Niobrara unconventional liquids plays and in the Marcellus, Haynesville/Bossier and Barnett unconventional natural gas shale plays.  The company also owns substantial marketing and oilfield services businesses through its subsidiaries Chesapeake Energy Marketing, Inc. and Chesapeake Oilfield Services, L.L.C.  Further information is available at www.chk.com where Chesapeake routinely posts announcements, updates, events, investor information, presentations and news releases.

The Chesapeake Energy Corporation logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=15147 About Gavilon, LLC

Gavilon, LLC is a subsidiary of The Gavilon Group, LLC. The Gavilon Group is a leading commodity management firm, connecting producers and consumers of feed, food and fuel through its global supply chain network. Gavilon leverages its strategic partnerships and more than 300 facilities and regional offices worldwide to link agricultural and energy supply with demand. The company provides origination, storage and handling, transportation and logistics, marketing and distribution, and risk management services to tens of thousands of customers each year. Headquartered in Omaha, Nebraska, Gavilon employs 2,000 people around the world and is ranked America's nineteenth largest private company by Forbes. For more information, please visit www.gavilon.com .

The Gavilon, LLC logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=15148

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.

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