Sec Form 4 Filing - Buffalo Investor I, L.P. @ SemGroup Corp - 2019-09-16

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Buffalo Investor I, L.P. 2. Issuer Name and Ticker or Trading Symbol SemGroup Corp [ SEMG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ALINDA CAPITAL PARTNERS,, 100 WEST PUTNAM AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 09/16/2019 (Street) GREENWICH, CT06830 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 09/16/2019 S 2,821,204 D $ 16.61 ( 5 ) 4,524,925 I See Footnotes ( 1 ) ( 3 ) ( 4 ) Class A Common Stock 09/16/2019 S 2,821,204 D $ 16.61 ( 5 ) 2,216,567 I See Footnotes ( 2 ) ( 3 ) ( 4 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Buffalo Investor I, L.P. C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Buffalo Investor I GP, LLC C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Buffalo Holding I LLC C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Buffalo Holding II LLC C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X ALINDA INFRASTRUCTURE FUND II LP C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Alinda GP II, L.P. C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Alinda Parallel Fund GP II, L.P. C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Alinda Parallel Fund GP II, Ltd. C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Alinda GP of GP II LLC C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Beale Christopher W. C/O ALINDA CAPITAL PARTNERS, 100 WEST PUTNAM AVENUE GREENWICH, CT06830 X Signatures BUFFALO INVESTOR I, L.P., By: BUFFALO INVESTOR I GP, LLC, its general partner, By; /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date BUFFALO INVESTOR I GP, LLC, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date BUFFALO HOLDING I LLC, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date BUFFALO HOLDING II LLC, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date ALINDA INFRASTRUCTURE FUND II, L.P., By: ALINDA GP II, L.P., its general partner, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date ALINDA GP II, L.P., By: ALINDA GP OF GP II LLC, its general partner, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date ALINDA PARALLEL FUND GP II, LP., By: ALINDA PARALLEL FUND GP II, LTD., is general partner, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date ALINDA PARALLEL FUND GP II, LTD, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date ALINDA GP OF GP II LLC, By: /s/ Christopher W. Beale, Name: Christopher W. Beale, Title: President 09/18/2019 Signature of Reporting Person Date /s/ Christopher W. Beale 09/18/2019 Signature of Reporting Person Date

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. Alinda GP II, L.P. is the sole member of Buffalo Investor I GP LLC. 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. Alinda Parallel Fund GP II, L.P. is the sole member of Buffalo Investor II GP, LLC. Alinda Parallel Fund GP II, Ltd is the general partner of Alinda Parallel Fund GP II, L.P. Mr. Christopher W. Beale is a 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 4. ( 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. ( 5 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $16.50 to $16.8975, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price in the range set forth above.

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 4(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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