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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date: January 2, 2014 2:00 P.M.
Form: S-4
CIK: 0001489136
Company Name: SemGroup Corp
File Number: 333-193005
CIK: 0001584018
Company Name: SemCanada, L.P.
File Number: 333-193005-12
CIK: 0001584033
Company Name: SemCanada II, L.P.
File Number: 333-193005-11
CIK: 0001584034
Company Name: SemMaterials, L.P.
File Number: 333-193005-10
CIK: 0001584036
Company Name: SemGroup Europe Holding, L.L.C.
File Number: 333-193005-09
CIK: 0001533324
Company Name: SemOperating G.P., L.L.C.
File Number: 333-193005-08
CIK: 0001584037
Company Name: SemMexico, L.L.C.
File Number: 333-193005-07
CIK: 0001584038
Company Name: SemDevelopment, L.L.C.
File Number: 333-193005-06
CIK: 0001536485
Company Name: Rose Rock Midstream Holdings, LLC
File Number: 333-193005-05
CIK: 0001584041
Company Name: Wattenberg Holding, LLC
File Number: 333-193005-04
CIK: 0001584043
Company Name: Glass Mountain Holding, LLC
File Number: 333-193005-03
CIK: 0001594623
Company Name: Mid-America Midstream Gas Services, L.L.C.
File Number: 333-193005-02
CIK: 0001584016
Company Name: SemGas, L.P.
File Number: 333-193005-01