Rose Rock Midstream, L.P. Increases Distributions on Limited Partner Units

Rose Rock Midstream, L.P. Increases Distributions on Limited Partner Units

TULSA, Okla., July 25, 2013 (GLOBE NEWSWIRE) -- Rose Rock Midstream, L.P.
(NYSE:RRMS) announced today that the Board of Directors of its general partner
has declared a cash distribution for the second quarter of 2013 of $0.44 per
unit, or $1.76 per unit on an annualized basis. This distribution represents
an increase of approximately 15% over the second quarter of 2012 quarterly
distribution of $0.3825 per unit, and an approximately 2.3% increase over the
prior quarter's distribution.

The distribution will be paid on August 14, 2013 to all unitholders of record
on August 5, 2013.

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.

This release is a qualified notice under Treasury Regulation Section
1.1446-4(b). Brokers and nominees should treat 100% of Rose Rock Midstream,
L.P.'s distributions to foreign investors as being attributable to income that
is effectively connected with a United States trade or business. Therefore,
distributions to foreign investors are subject to federal income tax
withholding at the highest applicable effective tax rate.

CONTACT: Investor Relations:
         Mary Catherine Ward
         Kiley Roberson

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