X0206 3 2017-07-17 0 0001489136 SemGroup Corp SEMG 0001712611 Buffalo Investor II, L.P. C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH CT 06830 0 0 1 0 0001712612 Buffalo Investor II GP, LLC C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH CT 06830 0 0 1 0 Class A Common Stock 7346129 I See footnotes Class A Common Stock 5037771 I See footnotes These securities are directly held by Buffalo Investor I, L.P. Buffalo Investor I GP LLC is the general partner of Buffalo Investor I, L.P. Buffalo Holding I LLC is the Managing Member of Buffalo Investor I GP LLC. Alinda Infrastructure Fund II, L.P. is the Managing Member of Buffalo Holding I LLC. Alinda GP II, L.P. is the general partner of Alinda Infrastructure Fund II, L.P. Alinda GP of GP II LLC is the general partner of Alinda GP II, L.P. Mr. Christopher W. Beale is the Managing Member of Alinda GP of GP II LLC. These securities are directly held by Buffalo Investor II, L.P. Buffalo Investor II GP LLC is the general partner of Buffalo Investor II, L.P. Buffalo Holding II LLC is the Managing Member of Buffalo Investor II GP, L.P. Alinda Parallel Fund GP II, L.P. is the managing member of Buffalo Holding II LLC. Alinda Parallel Fund GP II, Ltd. is the general partner of Alinda Parallel Fund GP II, L.P. Mr. Christopher W. Beale is the Director of Alinda Parallel Fund GP II, Ltd. Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form. 3.(4) Each of the Reporting Persons (other than to the extent it directly holds securities reported herein) disclaims beneficial ownership of the securities held by the other Reporting Persons, except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), each of the Reporting Persons (other than to the extent it directly holds securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose. BUFFALO INVESTOR II, L.P., By: BUFFALO INVESTOR II GP, LLC, its general partner, By: /s/ John S. Laxmi, Name: John S. Laxmi, Title: Secretary 2017-07-25 BUFFALO INVESTOR II GP, LLC, By: BUFFALO HOLDING II LLC, its managing member, By: /s/ John S. Laxmi, Name: John S. Laxmi, Title: Secretary 2017-07-25