X0508 4 2023-09-12 0001423902 Western Midstream Partners, LP WES 0000797468 OCCIDENTAL PETROLEUM CORP /DE/ 5 GREENWAY PLAZA SUITE 110 HOUSTON TX 77046 true 0000856716 WESTERN GAS RESOURCES INC 1099 18TH STREET, SUITE 1200 DENVER CO 80202-1955 true 0001601306 APC Midstream Holdings, LLC 5 GREENWAY PLAZA SUITE 110 HOUSTON TX 77046 true 0001771584 WGR Asset Holding Co LLC 5 GREENWAY PLAZA SUITE 110 HOUSTON TX 77046 true 0001699285 Kerr-McGee Worldwide Corp 5 GREENWAY PLAZA SUITE 110 HOUSTON TX 77046 true Former 10% Owner 0001824936 Anadarko USH1 Corp 5 GREENWAY PLAZA SUITE 110 HOUSTON TX 77046 true 0001141185 KERR MCGEE CORP /DE 5 GREENWAY PLAZA SUITE 110 HOUSTON TX 77046 true false COMMON UNITS (LIMITED PARTNER INTERESTS) 2023-09-12 4 S 0 5100000 25 D 185181578 I See Footnotes On September 7, 2023, Western Midstream Partners, LP (the "Issuer") entered into a unit purchase agreement with Western Gas Resources, Inc. ("WGRI") pursuant to which the Issuer agreed to purchase 5,100,000 common units representing limited partner interests in the Issuer (the "Common Units") from WGRI at a price of $25.00 per Common Unit. WGRI and the Issuer completed the sale of such Common Units on September 12, 2023. Following the transaction reported herein, WGRI holds 156,219,520 Common Units, WGR Asset Holding Company LLC ("WGRAH") holds 14,139,260 Common Units, APC Midstream Holdings, LLC ("APCMH") holds 457,849 Common Units and Anadarko USH1 Corporation ("Anadarko USH1") holds 14,364,949 Common Units. WGRI also is the sole member of Western Midstream Holdings, LLC, the 2% economic general partner of the Issuer. OXY USA Inc. ("OXY USA") is a wholly owned subsidiary of Occidental Petroleum Corporation ("Occidental"). OXY USA owns 100% of the outstanding common stock of OXY Oil Partners, Inc. ("OOP"). OOP owns 100% of the outstanding common stock of Baseball Merger Sub 2, Inc. ("BMS"). Anadarko Petroleum Corporation ("APC") is a wholly owned subsidiary of BMS. APC owns (i) 100% of Anadarko Holding Company ("AHC") and (ii) indirectly, 100% of the common stock of WGRI and Kerr-McGee Corporation ("KMG"). WGRI is the sole member of APCMH, and APCMH is the sole member of WGRAH. KMG and AHC together own 100% of the common stock of Kerr-McGee Worldwide Corporation ("KMWW"), and APC and KMWW together indirectly own 100% of the common stock of Anadarko USH1. Accordingly, OXY USA, OOP, BMS, APC, AHC, WGRI, Anadarko USH1, KMG, APCMH, WGRAH and KMWW are all direct or indirect wholly owned subsidiaries of Occidental. Due to the limitations of the U.S. Securities and Exchange Commission's electronic filing system, each of Occidental, OXY USA, OOP, BMS, APC and AHC are concurrently filing a Form 4 to report the transaction disclosed herein. /s/ Nicole E. Clark as Vice President and Secretary of Western Gas Resources, Inc. 2023-09-14 /s/ Nicole E. Clark as Vice President and Secretary of APC Midstream Holdings, LLC 2023-09-14 /s/ Nicole E. Clark as Vice President and Secretary of WGR Asset Holding Company LLC 2023-09-14 /s/ Nicole E. Clark as Vice President and Secretary of Kerr-McGee Corporation 2023-09-14 /s/ Nicole E. Clark as Vice President and Secretary of Kerr-McGee Worldwide Corporation 2023-09-14 /s/ Nicole E. Clark as Vice President and Secretary of Anadarko USH1 Corporation 2023-09-14