Rose Rock Midstream Announces Pricing of Initial Public Offering at $20/Share

Rose Rock Midstream, L.P. announced today the pricing of its previously announced initial public offering of 7,000,000 of its common units representing limited partner interests at $20 per unit. Rose Rock Midstream has granted the underwriters a 30-day option to purchase up to an additional 1,050,000 common units to cover over-allotments, if any. The common units will begin trading on the New York Stock Exchange on December 9, 2011 under the symbol "RRMS." The offering is expected to close on or about December 14, 2011, subject to customary closing conditions. The common units offered to the public will represent an approximate 40.9% limited partner interest in Rose Rock Midstream, or an approximate 47.0% limited partner interest if the underwriters exercise their over-allotment option in full. SemGroup Corporation will indirectly own the remaining equity interests in Rose Rock Midstream, including the general partner interest and the related incentive distribution rights.