Rose Rock Midstream, L.P., recently formed by SemGroup to own and acquire midstream energy assets in the western US, announced terms for its IPO on Thursday. The Tulsa, OK-based company plans to raise $140 million by offering 7 million units at a price range of $19 to $21. At the mid-point of the proposed range, Rose Rock Midstream, L.P. will command a market value of $168 million. Rose Rock Midstream, L.P. plans to list on the NYSE under the symbol RRMS. Barclays Capital, Citi, and Deutsche Bank Securities are the lead underwriters on the deal.