Tulsa, OK, April 24, 2012 -- 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 first quarter of 2012 of $.3725 per unit, or $1.49 per unit on an annualized basis. This is a 2.8% increase over the prior quarter on an annualized basis and marks the first increase in the distribution to RRMS limited partner unitholders. For the prior quarter, the prorated distribution from the initial public offering date of December 14, 2011 was $0.0670 per limited partnership unit, representing the minimum quarterly distribution of $0.3625 on a full quarter basis, or $1.45 on an annualized basis. The distribution will be paid on May 15, 2012 to all unitholders of record on May 7, 2012.

About Rose Rock Midstream
Rose Rock Midstream, L.P. (NYSE: RRMS) is a growth-oriented Delaware limited partnership recently formed by SemGroup® Corporation (NYSE: SEMG) to own, operate, develop and acquire a diversified portfolio of midstream energy assets.

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.

Contacts:
Investor Relations:
Alisa Perkins
918-524-7711
[email protected]

Media:
Liz Barclay
918-524-8158
[email protected]