Western Midstream Partners, LP

SEC source: 0000899243-19-005978 · doc4.xml · derivative · entry 5

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Midstream Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common units representing limited partner interests · 14,681,388 shares

Expires not disclosed

F3 · derivative.exercise_price: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · derivative.exercise_price: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · derivative.exercise_price: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F3 · price: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · price: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · price: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F3 · derivative.exercise_date: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · derivative.exercise_date: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · derivative.exercise_date: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F3 · derivative.expiration_date: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · derivative.expiration_date: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · derivative.expiration_date: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F1 · ownership.nature: On February 27, 2019, (i) Western Gas Equity Partners, LP ("WGP") owned 50,132,046 common units of Western Gas Partners, LP ("WES") and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC ("WES GP"), and APC Midstream Holdings, LLC ("AMH") owned 1,562,251 WES common units and 14,681,388 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owned (A) all of the membership interests of WGP GP, the general partner of WGP, (B) 77.8% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owned all of the issued and outstanding shares of common stock of WGR.

F2 · ownership.nature: (Continued from Footnote 1) Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH. Also prior to the Effective Time, (i) Kerr-McGee Worldwide Corporation ("KWC") owned 449,129 WES common units, (ii) Kerr-McGee Corporation ("KMG") owned 100% of KWC, and (iii) Anadarko owned 100% of KMG. Accordingly, KMG and Anadarko may be deemed to be indirect beneficial owners of any securities held by KWC.

SEC source: 0000899243-19-005978 · doc4.xml · nonDerivative · entry 4

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Midstream Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

F3 · price: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · price: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · price: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F3 · ownership.nature: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · ownership.nature: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · ownership.nature: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

SEC source: 0000899243-19-005978 · doc4.xml · nonDerivative · entry 3

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Midstream Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 218,209,719

F3 · price: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · price: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · price: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F3 · ownership.nature: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · ownership.nature: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · ownership.nature: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

SEC source: 0000899243-19-005978 · doc4.xml · nonDerivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Midstream Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 112,585,015

F3 · price: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · price: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · price: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F3 · ownership.nature: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · ownership.nature: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · ownership.nature: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

SEC source: 0000899243-19-005978 · doc4.xml · nonDerivative · entry 1

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Midstream Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 66,824,814

F1 · price: On February 27, 2019, (i) Western Gas Equity Partners, LP ("WGP") owned 50,132,046 common units of Western Gas Partners, LP ("WES") and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC ("WES GP"), and APC Midstream Holdings, LLC ("AMH") owned 1,562,251 WES common units and 14,681,388 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owned (A) all of the membership interests of WGP GP, the general partner of WGP, (B) 77.8% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owned all of the issued and outstanding shares of common stock of WGR.

F2 · price: (Continued from Footnote 1) Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH. Also prior to the Effective Time, (i) Kerr-McGee Worldwide Corporation ("KWC") owned 449,129 WES common units, (ii) Kerr-McGee Corporation ("KMG") owned 100% of KWC, and (iii) Anadarko owned 100% of KMG. Accordingly, KMG and Anadarko may be deemed to be indirect beneficial owners of any securities held by KWC.

F3 · price: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · price: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · price: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

F1 · ownership.nature: On February 27, 2019, (i) Western Gas Equity Partners, LP ("WGP") owned 50,132,046 common units of Western Gas Partners, LP ("WES") and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC ("WES GP"), and APC Midstream Holdings, LLC ("AMH") owned 1,562,251 WES common units and 14,681,388 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owned (A) all of the membership interests of WGP GP, the general partner of WGP, (B) 77.8% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owned all of the issued and outstanding shares of common stock of WGR.

F2 · ownership.nature: (Continued from Footnote 1) Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH. Also prior to the Effective Time, (i) Kerr-McGee Worldwide Corporation ("KWC") owned 449,129 WES common units, (ii) Kerr-McGee Corporation ("KMG") owned 100% of KWC, and (iii) Anadarko owned 100% of KMG. Accordingly, KMG and Anadarko may be deemed to be indirect beneficial owners of any securities held by KWC.

F3 · ownership.nature: On February 28, 2019 (the "Effective Time"), WES and the other parties thereto consummated the transactions contemplated by the Contribution Agreement and Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 7, 2018, by and among WES, WES GP, WGP, WGP GP, Anadarko, Anadarko E&P Onshore LLC, Clarity Merger Sub, LLC and certain other affiliates of Anadarko and WES. Immediately prior to the Effective Time and as contemplated by the Merger Agreement, (i) affiliates of Anadarko contributed certain midstream assets to subsidiaries of WES in exchange for cash and 45,760,201 WES common units (the "Contribution"); (ii) all outstanding Class C Units were converted into WES common units on a one-for-one basis (the "Class C Unit Conversion"); and (iv) the incentive distribution rights ("IDRs") and 2,583,068 general partner units of WES held by WES GP were converted into 105,624,704 WES common units and a non-economic general partner interest in WES (the "IDR Conversion").

F4 · ownership.nature: Upon the Effective Time and as contemplated by the Merger Agreement, (i) 39,384,917 of the 45,760,201 WES common units received as part of the Contribution were converted into WGP common units at a ratio of 1.406 WGP common units for every on WES Common Unit, (ii) all 14,681,388 WES common units issued as part of the Class C Conversion, as well as all other WES common units held by AMH and KWC, were converted into WGP common units at a ratio of 1.525 WGP common units for every WES common unit, (iii) WES common units held by WGP, including the units issued in the IDR Conversion and the remaining units issued as part of the Contribution, continued outstanding as privately held limited partner interests in WES.

F5 · ownership.nature: (Continued from Footnote 4) Also following the Effective Time, (i) WES common units, which traded on the New York Stock Exchange ("NYSE") under the symbol "WES" through February 27, 2019, were delisted from the NYSE and ceased trading and (ii) WGP common units, which previously traded on the NYSE under the symbol "WGP" through February 27, 2019, began trading under the symbol "WES" on the NYSE beginning on February 28, 2019.

SEC source: 0000899243-19-003542 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,681,388

Underlying: Common units representing limited partner interests · 308,723 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2018. Except as provided in that certain Contribution Agreement and Agreement and Plan of Merger, dated as of November 7, 2018, by and among Anadarko Petroleum Corporation, Anadarko E&P Onshore LLC, Western Gas Equity Partners, LP, Western Gas Equity Holdings, LLC,

F2 · derivative.exercise_date: (Continued from Footnote 1) WES, Western Gas Holdings, LLC, Clarity Merger Sub, LLC, WGR Asset Holding Company LLC, WGR Operating, LP, Kerr-McGee Gathering LLC, Kerr-McGee Worldwide Corporation, APC Midstream Holdings, LLC, and Delaware Basin Midstream, LLC, the Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2018. Except as provided in that certain Contribution Agreement and Agreement and Plan of Merger, dated as of November 7, 2018, by and among Anadarko Petroleum Corporation, Anadarko E&P Onshore LLC, Western Gas Equity Partners, LP, Western Gas Equity Holdings, LLC,

F2 · derivative.expiration_date: (Continued from Footnote 1) WES, Western Gas Holdings, LLC, Clarity Merger Sub, LLC, WGR Asset Holding Company LLC, WGR Operating, LP, Kerr-McGee Gathering LLC, Kerr-McGee Worldwide Corporation, APC Midstream Holdings, LLC, and Delaware Basin Midstream, LLC, the Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2018. Except as provided in that certain Contribution Agreement and Agreement and Plan of Merger, dated as of November 7, 2018, by and among Anadarko Petroleum Corporation, Anadarko E&P Onshore LLC, Western Gas Equity Partners, LP, Western Gas Equity Holdings, LLC,

F2 · ownership.nature: (Continued from Footnote 1) WES, Western Gas Holdings, LLC, Clarity Merger Sub, LLC, WGR Asset Holding Company LLC, WGR Operating, LP, Kerr-McGee Gathering LLC, Kerr-McGee Worldwide Corporation, APC Midstream Holdings, LLC, and Delaware Basin Midstream, LLC, the Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F3 · ownership.nature: As of February 13, 2019, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 14,681,388 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 77.8% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH

SEC source: 0000899243-18-028732 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,372,665

Underlying: Common units representing limited partner interests · 327,236 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2018. Except as provided in that certain Contribution Agreement and Agreement and Plan of Merger, dated as of November 7, 2018, by and among Anadarko Petroleum Corporation, Anadarko E&P Onshore LLC, Western Gas Equity Partners, LP, Western Gas Equity Holdings, LLC,

F2 · derivative.exercise_date: (Continued from Footnote 1) WES, Western Gas Holdings, LLC, Clarity Merger Sub, LLC, WGR Asset Holding Company LLC, WGR Operating, LP, Kerr-McGee Gathering LLC, Kerr-McGee Worldwide Corporation, APC Midstream Holdings, LLC, and Delaware Basin Midstream, LLC, the Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2018. Except as provided in that certain Contribution Agreement and Agreement and Plan of Merger, dated as of November 7, 2018, by and among Anadarko Petroleum Corporation, Anadarko E&P Onshore LLC, Western Gas Equity Partners, LP, Western Gas Equity Holdings, LLC,

F2 · derivative.expiration_date: (Continued from Footnote 1) WES, Western Gas Holdings, LLC, Clarity Merger Sub, LLC, WGR Asset Holding Company LLC, WGR Operating, LP, Kerr-McGee Gathering LLC, Kerr-McGee Worldwide Corporation, APC Midstream Holdings, LLC, and Delaware Basin Midstream, LLC, the Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2018. Except as provided in that certain Contribution Agreement and Agreement and Plan of Merger, dated as of November 7, 2018, by and among Anadarko Petroleum Corporation, Anadarko E&P Onshore LLC, Western Gas Equity Partners, LP, Western Gas Equity Holdings, LLC,

F2 · ownership.nature: (Continued from Footnote 1) WES, Western Gas Holdings, LLC, Clarity Merger Sub, LLC, WGR Asset Holding Company LLC, WGR Operating, LP, Kerr-McGee Gathering LLC, Kerr-McGee Worldwide Corporation, APC Midstream Holdings, LLC, and Delaware Basin Midstream, LLC, the Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F3 · ownership.nature: As of November 13, 2018, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 14,372,665 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 77.8% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH

SEC source: 0000899243-18-022134 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,045,429

Underlying: Common units representing limited partner interests · 267,164 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended June 30, 2018. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended June 30, 2018. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended June 30, 2018. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of August 13, 2018, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 14,045,429 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 78% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.

SEC source: 0000899243-18-012875 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,778,265

Underlying: Common units representing limited partner interests · 272,988 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended March 31, 2018. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended March 31, 2018. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended March 31, 2018. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of May 14, 2018, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 13,778,265 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 78% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.

SEC source: 0000899243-18-003676 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,505,277

Underlying: Common units representing limited partner interests · 261,394 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of February 13, 2018, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 13,505,277 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 78% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.

SEC source: 0000899243-17-026068 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,243,883

Underlying: Common units representing limited partner interests · 266,250 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of November 13, 2017, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 13,243,883 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 78% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.

SEC source: 0000899243-17-020233 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,977,633

Underlying: Common units representing limited partner interests · 234,315 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended June 30, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended June 30, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended June 30, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of August 11, 2017, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 12,977,633 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 78% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.

SEC source: 0000899243-17-012999 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

Kerr-McGee Worldwide Corp · CIK 0001699285 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,743,318

Underlying: Common units representing limited partner interests · 206,218 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended March 31, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended March 31, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until March 2020 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended March 31, 2017. The Class C units will convert into common units on a one-for-one basis on March 1, 2020, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of May 12, 2017, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 12,743,318 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 78% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.

SEC source: 0000899243-17-003974 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

ANADARKO MARCELLUS MIDSTREAM, L.L.C. · CIK 0001571011 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,537,100

Underlying: Common units representing limited partner interests · 178,976 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2016. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2016. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2016. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of February 14, 2017, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 12,537,100 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 78% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.

SEC source: 0000899243-16-033176 · doc4.xml · derivative · entry 2

ANADARKO PETROLEUM CORP · CIK 0000773910 · 10% owner

WESTERN GAS RESOURCES INC · CIK 0000856716 · 10% owner

Western Gas Equity Partners, LP · CIK 0001423902 · 10% owner

Western Gas Equity Holdings, LLC · CIK 0001563544 · 10% owner

ANADARKO MARCELLUS MIDSTREAM, L.L.C. · CIK 0001571011 · 10% owner

APC Midstream Holdings, LLC · CIK 0001601306 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,358,124

Underlying: Common units representing limited partner interests · 197,699 shares

Expires not disclosed

F1 · derivative.exercise_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2016. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · derivative.expiration_date: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2016. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless WES elects to convert such units earlier or AMH extends the conversion date.

F1 · ownership.nature: On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended September 30, 2016. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless WES elects to convert such units earlier or AMH extends the conversion date.

F2 · ownership.nature: As of November 10, 2016, (i) WGP owns 50,132,046 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 1,562,251 WES common units and 12,358,124 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 81.6% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.