X0306 4 2016-09-30 0 0001489136 SemGroup Corp SEMG 0001366918 BALLSCHMIEDE RONALD A 6120 SOUTH YALE AVE. SUITE 700 TULSA OK 74136 1 0 0 0 Common Stock 2016-09-30 4 A 0 3937 0.00 A 8912 D Common Stock 15358 I Held by GRAT On September 30, 2016, pursuant to an Agreement and Plan of Merger entered into by Rose Rock Midstream, L.P. ("RRMS"), Rose Rock Midstream GP, LLC, SemGroup Corporation ("SemGroup"), and PBMS, LLC, each outstanding common unit representing limited partner interests in RRMS (each a "Common Unit") held by the Reporting Person converted into 0.8136 shares of validly issued, fully paid and non-assessable SemGroup Class A common stock, par value $0.01 per share (the "Merger Exchange"). As a result of the Merger Exchange, SemGroup issued the common stock reported on Table 1 to the Reporting Person. 15,358 shares previously reports as directly owned are now being reports as indirectly owned by the RAB GRAT 2016-1 grantor annuity trust ("GRAT"). The reporting person is the sole trustee and sole annuitant of the GRAT. Candice L. Cheeseman, Power of Attorney for Ronald A. Ballschmiede 2016-09-30