SemGroup Corporation and Rose Rock Midstream to Participate in Morgan Stanley Midstream MLP and Diversified Natural Gas

SemGroup Corporation and Rose Rock Midstream to Participate in Morgan Stanley
Midstream MLP and Diversified Natural Gas Corporate Access Event

TULSA, Okla., Feb. 25, 2014 (GLOBE NEWSWIRE) -- SemGroup^® Corporation
(NYSE:SEMG) and Rose Rock Midstream, L.P. (NYSE:RRMS) will attend the 2014
Morgan Stanley Midstream MLP and Diversified Natural Gas Corporate Access
Event in New York City on March 4-5, 2014.

Rose Rock Midstream,
L.P.

SemGroup and Rose Rock Midstream Chief Financial Officer Bob Fitzgerald will
conduct one-on-one meetings with members of the investment community. The
presentation materials used during the conference will be accessible on the
SemGroup website at www.semgroupcorp.com and the Rose Rock Midstream website
at www.rrmidstream.com on Tuesday, March 4, 2014.

About SemGroup

Based in Tulsa, Oklahoma, SemGroup^® Corporation 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.

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.
Headquartered in Tulsa, OK, Rose Rock Midstream provides crude oil gathering,
transportation, storage and marketing services with the majority of its assets
strategically located in or connected to the Cushing, Oklahoma crude oil
marketing hub.

CONTACT: Investor Relations:
         Alisa Perkins, 918-524-8081
         investor.relations@semgroupcorp.com
         roserockir@rrmidstream.com
        
         Media:
         Kiley Roberson, 918-524-8594
         kroberson@semgroupcorp.com
         kroberson@rrmidstream.com

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