Western Midstream Operating, LP

Adjusted Gross Margin. We define Adjusted Gross Margin attributable to Western Midstream Partners, LP (“Adjusted Gross Margin”) as total revenues and other (less reimbursements for electricity-related expenses recorded as revenue), less cost of product, plus distributions from equity investments, and excluding the noncontrolling interest owners’ proportionate share of revenues and cost of product. We believe Adjusted Gross Margin is an important performance measure of our operations’ profitability and performance as compared to other companies in the midstream industry. Cost of product expenses include (i) costs associated with the purchase of natural gas and NGLs pursuant to our percent-of-proceeds, percent-of-product, and keep-whole contracts, (ii) costs associated with the valuation of gas and NGLs imbalances, (iii) costs associated with our obligations under certain contracts to redeliver a volume of natural gas to shippers, which is thermally equivalent to condensate retained by us and sold to third parties, and (iv) costs associated with our offload commitments with third parties providing firm-processing capacity. The electricity-related expenses included in our Adjusted Gross Margin definition relate to pass-through expenses that are recorded as operation and maintenance expense with an offset recorded as revenue for the reimbursement by certain customers.

Adjusted EBITDA. We define Adjusted EBITDA attributable to Western Midstream Partners, LP (“Adjusted EBITDA”) as net income (loss), plus (i) distributions from equity investments, (ii) non-cash equity-based compensation expense, (iii) interest expense, (iv) income tax expense, (v) depreciation and amortization, (vi) impairments, and (vii) other expense (including lower of cost or market inventory adjustments recorded in cost of product), less (i) gain (loss) on divestiture and other, net, (ii) gain (loss) on early extinguishment of debt, (iii) income from equity investments, (iv) income tax benefit, (v) other income, (vi) other items impacting comparability with our core operating performance, and (vii) the noncontrolling interest owners’ proportionate share of revenues and expenses. We believe the presentation of Adjusted EBITDA provides information useful to investors in assessing our financial condition and results of operations and that Adjusted EBITDA is a widely accepted financial indicator of a company’s ability to incur and service debt, fund capital expenditures, and make distributions. Adjusted EBITDA is a supplemental financial measure that management and external users of our consolidated financial statements, such as industry analysts, investors, commercial banks, and rating agencies, use, among other measures, to assess the following:

•our operating performance as compared to other publicly traded partnerships in the midstream industry, without regard to financing methods, capital structure, or historical cost basis;

•the ability of our assets to generate cash flow to make distributions; and

•the viability of acquisitions and capital expenditures and the returns on investment of various investment opportunities.

Distributable Cash Flow. We define Distributable Cash Flow (“DCF”) as Adjusted EBITDA, less total revenues and other recognized in Adjusted EBITDA in excess of (less than) customer billings; net cash paid for (i) interest expense (net of interest income recorded in other income (expense) and non-cash capitalized interest), (ii) maintenance capital expenditures, and (iii) income taxes; and Distributable Cash Flow attributable to noncontrolling interests to the extent such amounts are not excluded from Adjusted EBITDA. We believe DCF provides useful information to management and investors because it is used by other companies in the midstream industry, as well as by analysts, as a supplemental performance measure to evaluate our operating performance after cash interest expense, maintenance capital expenditures, service revenues in excess of billings, and income taxes, and to compare our operating and financial performance with that of other publicly traded partnerships that may have different capital structures or financing methods. We utilize DCF as a measure of the operating performance of our asset base and as such reconcile it to net income (loss) and Adjusted EBITDA, with the adjustments intended to enhance period-over-period comparability. DCF does not reflect changes in working capital, growth capital expenditures, acquisitions, or debt or equity financing. DCF should not be viewed as a measure of our liquidity. When evaluating our liquidity, investors should focus on net cash provided by operating activities, as well as the overall statement of cash flows, and the “Liquidity and Capital Resources” section of our Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Free Cash Flow. We define “Free Cash Flow” as net cash provided by operating activities less total capital expenditures and contributions to equity investments, plus distributions from equity investments in excess of cumulative earnings. Management considers Free Cash Flow an appropriate metric for assessing capital discipline, cost efficiency, and balance-sheet strength. Although Free Cash Flow is the metric used to assess our ability to make distributions to unitholders, this measure should not be viewed as indicative of the actual amount of cash that is available for distributions or planned for distributions for a given period. Instead, Free Cash Flow represents the amount of cash that is available in aggregate for distributions, debt repayments, and other general partnership purposes.

Adjusted Gross Margin, Adjusted EBITDA, Distributable Cash Flow, and Free Cash Flow are not defined in GAAP. The GAAP measure that is most directly comparable to Adjusted Gross Margin is gross margin. Net income (loss) and net cash provided by operating activities are the GAAP measures that are most directly comparable to Adjusted EBITDA. The GAAP measure that is most directly comparable to Distributable Cash Flow is net income (loss). The GAAP measure that is most directly comparable to Free Cash Flow is net cash provided by operating activities. Our non-GAAP financial measures (i) should not be considered as alternatives to the comparable GAAP measures or any other measure of financial performance presented in accordance with GAAP, (ii) have important limitations as analytical tools because they exclude some, but not all, items that affect the comparable GAAP measures, (iii) should not be considered in isolation or as a substitute for analysis of our results as reported under GAAP, and (iv) may not be comparable to similarly titled measures of other companies in our industry, thereby diminishing their utility as comparative measures.

Management compensates for the limitations of our non-GAAP measures as analytical tools by reviewing the comparable GAAP measures, understanding the differences, and incorporating this knowledge into its decision-making processes. We believe that investors benefit from having access to the same financial measures that our management considers in evaluating our operating results.

The following tables present reconciliations of the GAAP measures to our non-GAAP measures:

To facilitate investor and industry analysis, we also discloseper-Mcf Adjusted Gross Margin for natural-gas assets, per-Bbl Adjusted Gross Margin for crude-oil and NGLs assets, and per-Bbl Adjusted Gross Margin for produced-water assets.

(1)Excludes corporate-level depreciation and amortization and other corporate-level items.

(2)Average for period. Calculated as Gross margin for natural-gas assets, crude-oil and NGLs assets, or produced-water assets, divided by the respective total throughput (MMcf or MBbls) for natural-gas assets, crude-oil and NGLs assets, or produced-water assets.

(3)Average for period. Calculated as Adjusted Gross Margin for natural-gas assets, crude-oil and NGLs assets, or produced-water assets, divided by the respective total throughput (MMcf or MBbls) attributable to WES for natural-gas assets, crude-oil and NGLs assets, or produced-water assets.

(1)Includes non-cash revenue of $42.6 million and $45.4 million for the three months ended September 30, 2026, and June 30, 2026, respectively, and $143.2 million and $13.3 million for the nine months ended September 30, 2026 and 2025, respectively. See Note 2—Revenue from Contracts with Customers in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

Gross margin. Refer to Operating Results within this Item 2 for a discussion of the components of gross margin as compared to the prior periods, including Revenues, Cost of Product (Natural-gas purchases, Crude oil and NGLs purchases, and Other items), and Other Operating Expenses (Depreciation and amortization expense).

Gross margin decreased by $52.6 million for the three months ended September 30, 2026, primarily due to (i) a $30.5 million decrease in total revenues and other and (ii) a $17.8 million increase in depreciation and amortization.

Gross margin increased by $406.7 million for the nine months ended September 30, 2026, primarily due to a $730.6 million increase in total revenues and other. This increase was offset partially by (i) a $206.7 million increase in cost of product and (ii) a $117.3 million increase in depreciation and amortization.

Net income (loss). Refer to Operating Results within this Item 2 for a discussion of the primary components of net income (loss) as compared to the prior periods.

Net income (loss) decreased by $76.3 million for the three months ended September 30, 2026, primarily due to (i) a $30.7 million increase in total operating expenses, (ii) a $30.5 million decrease in total revenues and other, and (iii) a $7.6 million increase in interest expense.

Net income (loss) increased by $97.1 million for the nine months ended September 30, 2026, primarily due to a $730.6 million increase in total revenues and other. This increase was offset partially by (i) a $550.9 million increase in total operating expenses, (ii) a $54.1 million increase in interest expense, (iii) a $9.3 million decrease in equity income, (iv) an $8.7 million decrease in gain (loss) on divestiture and other, net, and (v) a $7.7 million increase in income tax expense (benefit).

Net cash provided by operating activities. Refer to Historical cash flow within this Item 2 for a discussion of the primary components of net cash provided by operating activities as compared to the prior periods.