NYSE: WES

Western Midstream Partners, LP

CIK 0001423902 · Natural Gas Distribution

Large Revenue $3.8B Assets $14.9B as of Jun 15, 2026

Solaris Water Midstream, LLC (“Solaris”), a subsidiary of Aris, and certain affiliates are named defendants in Cause No. 23-05-1085, Stateline Operating, LLC and Stateline Royalties, LP vs. Devon Energy Corporation, Stateline Water, LLC, Devon Energy Production Company, LP, Solaris Water Midstream,… About this business →

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8-K Filed Jun 12, 2026 · Period ending Jun 11, 2026

Western Midstream closes $1.6B Brazos Delaware II acquisition with cash and equity

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10-Q Filed May 6, 2026 · Period ending Mar 31, 2026

WES integrates $2B Aris acquisition, adds water assets and debt; new saltwater lawsuit disclosed

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8-K Filed May 6, 2026 · Period ending May 6, 2026

Western Midstream reports Q1 2026 earnings results

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8-K Filed Feb 18, 2026 · Period ending Feb 18, 2026

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10-K Filed Feb 18, 2026 · Period ending Dec 31, 2025

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10-Q Filed Nov 4, 2025 · Period ending Sep 30, 2025

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10-Q Filed May 7, 2025 · Period ending Mar 31, 2025

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10-K Filed Feb 26, 2025 · Period ending Dec 31, 2024

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About Western Midstream Partners, LP

Source: Item 1 (Business) from the 10-K filed February 18, 2026. Description as filed by the company with the SEC.

Item 1. Legal Proceedings

Solaris Water Midstream, LLC (“Solaris”), a subsidiary of Aris, and certain affiliates are named defendants in Cause No. 23-05-1085, Stateline Operating, LLC and Stateline Royalties, LP vs. Devon Energy Corporation, Stateline Water, LLC, Devon Energy Production Company, LP, Solaris Water Midstream, LLC, Solaris Midstream DB-TX LLC, and Aris Water Solutions, Inc., in the 143rd District Court, Loving County, Texas, which was filed on May 4, 2023. In this action, Plaintiffs sue Defendants for, among other things, negligence, waste, trespass, and nuisance based on Plaintiffs’ allegations that Defendants’ operations have harmed Plaintiffs’ oil and gas lease through the injection of disposed saltwater. Defendants dispute Plaintiffs’ claims of liability and damages in this matter. Trial is currently scheduled for September 14, 2026.

We have elected to use a $1.0 million threshold for disclosing certain proceedings arising under federal, state, or local environmental laws when a government authority is a party and potential monetary sanctions are involved. We believe proceedings under this threshold are not material to our business and financial proceedings.

Other than the items listed herein, we are not a party to any legal, regulatory, or administrative proceedings other than proceedings arising in the ordinary course of business. Management believes that there are no such proceedings for which a final disposition could have a material adverse effect

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on results of operations, cash flows, or financial condition, or for which disclosure is otherwise required by Item 103 of Regulation S-K.