X0101 EFFECT 33 LIVE 2018-01-23 14:00:00

S-4

0001489136 SemGroup Corp 333-222473 0001576273 Rose Rock Midstream Energy GP, LLC 333-222473-15 0001576284 Rose Rock Midstream Crude, L.P. 333-222473-14 0001618028 Rose Rock Midstream Field Services, LLC 333-222473-13 0001584016 SemGas, L.P. 333-222473-12 0001584036 SemGroup Europe Holding, L.L.C. 333-222473-11 0001533324 SemOperating G.P., L.L.C. 333-222473-10 0001584037 SemMexico, L.L.C. 333-222473-09 0001584038 SemDevelopment, L.L.C. 333-222473-08 0001594623 Mid-America Midstream Gas Services, L.L.C. 333-222473-07 0001618241 SemCrude Pipeline, L.L.C. 333-222473-06 0001584041 Wattenberg Holding, LLC 333-222473-05 0001584043 Glass Mountain Holding, LLC 333-222473-04 0001584034 SemMaterials, L.P. 333-222473-03 0001576283 Rose Rock Finance Corp 333-222473-02 0001576269 Rose Rock Midstream Operating, LLC 333-222473-01