SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Buffalo Investor II, L.P. (Last) (First) (Middle) C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE (Street) GREENWICH CT 06830 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 07/17/2017	3. Issuer Name and Ticker or Trading Symbol SemGroup Corp [ SEMG ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock	7,346,129	I	See footnotes(1)(2)
Class A Common Stock	5,037,771	I	See footnotes(2)(3)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* Buffalo Investor II, L.P. (Last) (First) (Middle) C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE (Street) GREENWICH CT 06830 (City) (State) (Zip)

1. Name and Address of Reporting Person* Buffalo Investor II GP, LLC (Last) (First) (Middle) C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE (Street) GREENWICH CT 06830 (City) (State) (Zip)

Explanation of Responses:

1. 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.

2. 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.

3. 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.

Remarks:

	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	07/25/2017
	BUFFALO INVESTOR II GP, LLC, By: BUFFALO HOLDING II LLC, its managing member, By: /s/ John S. Laxmi, Name: John S. Laxmi, Title: Secretary	07/25/2017
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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