New York, May 31, 2016 -- Moody's Investors Service, ("Moody's") placed the ratings of SemGroup Corp. under review for upgrade, including the B2 Corporate Family Rating (CFR) and the Caa1 senior unsecured notes rating following SemGroup's announced agreement to purchase all of the outstanding common units of Rose Rock Midstream, L.P. At the same time, Moody's affirmed all of its ratings on Rose Rock, including the B1 CFR, the probability of default rating of B1-PD, the B2 senior unsecured notes ratings and the SGL-3 Speculative Grade Liquidity (SGL) Rating. The rating outlook for Rose Rock remains stable.
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