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13D Filing: Harvest Fund Advisors LLC and Semgroup Corp (SEMG)

Published on November 8, 2017 at 11:43 am by Insider Monkey Staff in Hedge Funds

You can access the original SEC filing by clicking here.

Ownership Summary Table

Name Sole Voting Power Shared Voting Power Sole Dispositive Power Shared Dispositive Power Aggregate Amount Owned Power Percent of Class
Harvest Fund Advisors 7,413,207 0 7,413,207 0 7,413,207 9.4%
Harvest Fund Holdco 7,413,207 0 7,413,207 0 7,413,207 9.4%
Blackstone Harvest Holdco 7,413,207 0 7,413,207 0 7,413,207 9.4%
Blackstone Intermediary Holdco 7,413,207 0 7,413,207 0 7,413,207 9.4%
Blackstone Advisory Partners 7,413,207 0 7,413,207 0 7,413,207 9.4%
Blackstone Advisory Services 7,413,207 0 7,413,207 0 7,413,207 9.4%
Blackstone Holdings I 7,413,207 0 7,413,207 0 7,413,207 9.4%
Blackstone Holdings I II GP Inc 7,413,207 0 7,413,207 0 7,413,207 9.4%
The Blackstone Group 7,413,207 0 7,413,207 0 7,413,207 9.4%
Blackstone Group Management 7,413,207 0 7,413,207 0 7,413,207 9.4%
Stephen A. Schwarzman 7,413,207 0 7,413,207 0 7,413,207 9.4%

Page 1 of 17 – SEC Filing

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934*

(Amendment No. 1)

SEMGROUP
CORPORATION

(Name of Issuer)

Class A Common Stock, par value $0.01 per share

(Title of Class of Securities)

81663A105

(CUSIP Number)

Anthony Merhige

Harvest Fund Advisors LLC

100 West Lancaster Avenue, Suite 200

Wayne, Pennsylvania 19087

Tel: (610) 341-9700

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

November 6, 2017

(Date of Event which Requires Filing of this Statement)

If the filing person has
previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e),
240.13d-1(f) or 240.13d-1(g), check the following box:  ☐

NOTE: Schedules filed in paper format shall
include a signed original and five copies of the schedule, including all exhibits. See Rule 240.13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information
which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).

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Page 2 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105 2
  1

NAMES OF
REPORTING PERSONS

Harvest Fund Advisors LLC
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

IA

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Page 3 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105 3
  1

NAMES OF
REPORTING PERSONS

Harvest Fund Holdco L.P.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY
OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

PN

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Page 4 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105 4
  1

NAMES OF
REPORTING PERSONS

Blackstone Harvest Holdco L.L.C.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

OO

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Page 5 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105 5
  1

NAMES OF
REPORTING PERSONS

Blackstone Intermediary Holdco L.L.C.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

OO

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Page 6 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105 6
  1

NAMES OF
REPORTING PERSONS

Blackstone Advisory Partners L.P.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

PN

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Page 7 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105
  1

NAMES OF
REPORTING PERSONS

Blackstone Advisory Services L.L.C.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

OO

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Page 8 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105 2
  1

NAMES OF
REPORTING PERSONS

Blackstone Holdings I L.P.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

PN

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Page 9 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105
  1

NAMES OF
REPORTING PERSONS

Blackstone Holdings I/II GP Inc.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

CO

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Page 10 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105 2
  1

NAMES OF
REPORTING PERSONS

The Blackstone Group L.P.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

PN

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Page 11 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105
  1

NAMES OF
REPORTING PERSONS

Blackstone Group Management L.L.C.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

OO

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Page 12 of 17 – SEC Filing

SCHEDULE 13D

CUSIP No. 81663A105
  1

NAMES OF
REPORTING PERSONS

Stephen A. Schwarzman
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP (See Instructions)

(a)  ☐        (b)  ☒
  3

SEC USE ONLY
  4

SOURCE OF FUNDS (See Instructions)

OO
  5

CHECK IF DISCLOSURE OF LEGAL
PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

☐
  6

CITIZENSHIP OR PLACE OF
ORGANIZATION

United States of America

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

   7

SOLE VOTING POWER

7,413,207
  8

SHARED VOTING POWER

0
  9

SOLE DISPOSITIVE POWER

7,413,207
10

SHARED DISPOSITIVE POWER

0
11

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

7,413,207
12

CHECK IF THE AGGREGATE AMOUNT IN ROW
(11) EXCLUDES CERTAIN SHARES (See Instructions)

☐
13

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (11)

9.4%
14

TYPE OF REPORTING PERSON (See
Instructions)

IN

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Page 13 of 17 – SEC Filing

This Amendment No. 1 (Amendment No. 1) to Schedule 13D relates to the
shares of Class A Common Stock, par value $0.01 per share (the Common Stock), of SemGroup Corporation, a Delaware corporation (the Issuer), and amends the initial statement on Schedule 13D filed on
October 26, 2017 (the Original Schedule 13D, and as amended, the Schedule 13D). This Amendment No. 1 is being filed to correct the number of shares of Common Stock related to the Derivative Agreements
reported in Item 6 of the Original Schedule 13D (as of October 22, 2017, an indirect subsidiary of The Blackstone Group L.P. held Derivative Agreements with respect to 20,686 shares of Common Stock (representing economic exposure to less than
0.1% of the Common Stock) instead of the 6,722,216 disclosed in the Original Schedule 13D). Capitalized terms used but not defined in this Amendment No. 1 shall have the same meanings ascribed to them in the Schedule 13D.

Item 3. Source and Amount of Funds or Other Consideration

Item 3 of the Schedule 13D is hereby supplemented by adding the following

As of November 1, 2017, the funds and accounts managed by HFA acquired the securities reported herein for aggregate consideration of
approximately $252.6 million, using cash available in such funds and accounts.

Item 5. Interest in Securities of the Issuer.

Items 5(a)-(b) of the Schedule 13D are hereby amended and restated as follows:

(a) and (b). Calculations of the percentage of Common Stock beneficially owned assumes that there are a total of 78,660,676 shares of Common
Stock outstanding as of September 30, 2017, as reported in the Issuers Registration Statement on Form S-3 filed on October 13, 2017.

The aggregate number and percentage of shares of Common Stock beneficially owned by each Reporting Person and, for each Reporting Person, the
number of shares of Common Stock as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or to direct the disposition
are set forth on rows 7 through 11 and row 13 of the cover pages of this Schedule 13D and are incorporated herein by reference.

The
amounts reported herein reflect the number of shares of Common Stock held by funds and accounts managed by HFA as of November 1, 2017. None of the Blackstone Persons directly owns any Common Stock.

Harvest Fund Holdco L.P. is the sole member of HFA. Blackstone Harvest Holdco L.L.C. is the general partner of Harvest Fund Holdco L.P.
Blackstone Intermediary Holdco L.L.C. is the sole member of Blackstone Harvest Holdco L.L.C. Blackstone Advisory Partners L.P. is the sole member of Blackstone Intermediary Holdco L.L.C. Blackstone Advisory Services L.L.C. is the general partner of
Blackstone Advisory Partners L.P. Blackstone Holdings I L.P. is the sole member of Blackstone Advisory Services L.L.C. Blackstone Holdings I/II GP Inc. is the general partner of Blackstone Holdings I L.P. The Blackstone Group L.P. is the controlling
shareholder of Blackstone Holdings I/II GP Inc. The general partner of The Blackstone Group L.P. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly-owned by Blackstones senior managing directors and controlled
by its founder, Stephen A. Schwarzman.

HFA, an investment adviser registered under the Investment Advisers Act of 1940, as amended,
advises funds and accounts. In such capacity, HFA has voting authority and dispositive discretion over the securities of the Issuer described in this Schedule 13D that are owned by the funds and accounts advised by it. Except for the purpose of
determining beneficial ownership under Section 13(d) of the Securities Exchange Act of 1934, as amended (the Exchange Act), HFA and the other Reporting Persons each disclaims beneficial ownership of all securities reported as
beneficially owned by HFA in this Schedule 13D. None of the Reporting Persons has any pecuniary interest in the securities reported as beneficially owned by HFA in this Schedule 13D, as such term is used for purposes of Section 16 of the
Exchange Act. Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that any of the Reporting Persons is the beneficial owner of the securities referred to herein for purposes of
Section 13(d) or Section 16 of the Exchange Act or for any other purpose.

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Page 14 of 17 – SEC Filing

Item 5(c) of the Schedule 13D is hereby amended and restated as follows:

(c) Except as set forth in Schedule 1 of this Amendment No. 1, none of the Reporting Persons has effected any transaction in Common Stock
since those reported on the Original Schedule 13D filed by the Reporting Persons on October 26, 2017.

Item 6. Contracts, Arrangements,
Understandings or Relationships With Respect to Securities of the Issuer.

Item 6 of the Schedule 13D is hereby amended and restated as
follows:

As of November 1, 2017, an indirect subsidiary of The Blackstone Group L.P. has entered into notional principal amount
derivative agreements (the Derivative Agreements) in the form of cash settled swaps with respect to 20,686 shares of Common Stock (representing economic exposure to less than 0.1% of the Common Stock). The Derivative Agreements
provide such holder with economic results that are comparable to the economic results of ownership but do not provide it with the power to vote or direct the voting or dispose of or direct the disposition of the shares of Common Stock that are the
subject of the Derivative Agreements (such shares, the Subject Shares). The Reporting Persons disclaim beneficial ownership in the Subject Shares. The counterparties to the Derivative Agreements are unaffiliated third party
financial institutions.

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Page 15 of 17 – SEC Filing

SIGNATURES

After reasonable inquiry and to the best of its or his knowledge and belief, each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated: November 6, 2017

HARVEST FUND ADVISORS LLC
By:

/s/ Anthony Merhige
Name: Anthony Merhige
Title: Senior Managing Director
HARVEST FUND HOLDCO L.P.
By: Blackstone Harvest Holdco L.L.C., its General Partner
By:

/s/ Marisa Beeney
Name: Marisa Beeney
Title: Authorized Person
BLACKSTONE HARVEST HOLDCO L.L.C.
By: Blackstone Intermediary Holdco L.L.C., its Sole Member
By: Blackstone Advisory Partners L.P., its Sole Member
By: Blackstone Advisory Services L.L.C., its General Partner
By: Blackstone Holdings I L.P., its Sole Member
By: Blackstone Holdings I/II GP Inc., its General Partner
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer
BLACKSTONE INTERMEDIARY HOLDCO L.L.C.
By: Blackstone Advisory Partners L.P., its Sole Member
By: Blackstone Advisory Services L.L.C., its General Partner
By: Blackstone Holdings I L.P., its Sole Member
By: Blackstone Holdings I/II GP Inc., its General Partner
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer
BLACKSTONE ADVISORY PARTNERS L.P.
By: Blackstone Advisory Services L.L.C., its General Partner
By: Blackstone Holdings I L.P., its Sole Member
By: Blackstone Holdings I/II GP Inc., its General Partner
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer

[SemGroup Corporation Schedule 13D/A]

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Page 16 of 17 – SEC Filing

BLACKSTONE ADVISORY SERVICES L.L.C.
By: Blackstone Holdings I L.P., its Sole Member
By: Blackstone Holdings I/II GP Inc., its General Partner
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer
BLACKSTONE HOLDINGS I L.P.
By: Blackstone Holdings I/II GP Inc., its General Partner
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer
BLACKSTONE HOLDINGS I/II GP INC.
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer
THE BLACKSTONE GROUP L.P.
By: Blackstone Group Management L.L.C., its General Partner
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer
BLACKSTONE GROUP MANAGEMENT L.L.C.
By:

/s/ Kathleen Skero
Name: Kathleen Skero
Title: Senior Managing Director Chief Accounting Officer

/s/ Stephen A. Schwarzman
Stephen A. Schwarzman

[SemGroup Corporation Schedule 13D/A]

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Page 17 of 17 – SEC Filing

SCHEDULE 1

The below reflects the transactions in Common Stock effected by the Reporting Persons since those reported on the Original Schedule 13D filed by the Reporting
Persons on October 26, 2017. All transactions occurred in the open market.

Date

 Common Stock
Purchased/(Sold)		 Weighted Average Trading
Price per Share of Common Stock		 Seller

10/30/2017

 (94,795 ) $ 26.0849 Harvest Fund Advisors LLC*

10/30/2017

 (33,806 ) $ 26.2250 Harvest Fund Advisors LLC*

10/30/2017

 33,806 $ 26.2250 Harvest Fund Advisors LLC*

10/31/2017

 (1,977 ) $ 25.9342 Harvest Fund Advisors LLC*
* Reflects transactions in the Common Stock effected by Harvest Fund Advisors LLC on behalf of the funds and accounts it manages.

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