X0508 4 2025-10-28 0 0001423902 Western Midstream Partners, LP WES 0001715126 Brown Oscar K 9950 WOODLOCH FOREST DR. THE WOODLANDS TX 77380 1 1 0 0 President & CEO 0 Common Units representing limited partner interests 2025-10-28 4 M 0 52660 0 A 92650 D Common Units representing limited partner interests 2025-10-28 4 F 0 20722 38.78 D 71928 D 2024 Phantom Units 2025-10-28 4 M 0 52660 0 D 2027-10-28 Common Units representing limited partner interests 52660 105318 D 2025 Phantom Units 2028-02-12 Common Units representing limited partner interests 72063 72063 D 2025 Performance Unit-ROA 2028-02-12 2028-02-12 Common Units representing limited partner interests 36032 36032 D 2025 Performance Unit-TUR 2028-02-12 2028-02-12 Common Units representing limited partner interests 36032 36032 D Each Phantom Unit is the economic equivalent of one WES Common Unit representing limited partnership interests, and upon vesting, will entitle the holder to receive a common unit or, at the discretion of the Board of Directors of the General Partner, cash equal to the Fair Market Value of a Common Unit. These Phantom Units vest ratably over a three-year period on October 28th each year, and will pay distribution equivalent rights in cash on a current basis. These Phantom Units vest ratably over a three-year period on February 12th of each year, and will pay distribution equivalent rights in cash on a current basis. Each performance-based unit represents the right to receive, following vesting, between 0% and 200% of one WES Common Unit based upon the achievement of pre-established performance metrics over a 3-year performance period. /s/ Philip C. Neisel, as attorney-in-fact 2025-10-29