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SemGroup Corporation and Rose Rock Midstream CEO and CFO to Participate in the US Capital Midstream Corporate Access Day

SemGroup Corporation and Rose Rock Midstream CEO and CFO to Participate in the
US Capital Midstream Corporate Access Day

TULSA, Okla., Jan. 21, 2013 (GLOBE NEWSWIRE) -- SemGroup^® Corporation
(NYSE:SEMG) (SemGroup) and Rose Rock Midstream, L.P. (NYSE:RRMS) will attend
the US Capital Midstream Corporate Access Day in Houston, Texas, on Tuesday,
January 29, 2013.

SemGroup Corporation logo

Rose Rock Midstream,
L.P.

SemGroup and Rose Rock Midstream Chief Executive Officer Norm Szydlowski and
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, January 29, 2013.

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.

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

SemGroup^®, is a registered trademark of SemGroup Corporation.

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.

The Rose Rock Midstream logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=16626

CONTACT: Investor Relations:
         Alisa Perkins, 918-524-8081
         investor.relations@semgroupcorp.com
         roserockir@rrmidstream.com
        
         Media:
         Liz Barclay, 918-524-8158
         lbarclay@semgroupcorp.com
         lbarclay@rrmidstream.com

SemGroup Corporation logo