Western Midstream Operating, LP

General. Western Midstream Partners, LP (the “Partnership”) is a Delaware master limited partnership formed in September 2012. Western Midstream Operating, LP (together with its subsidiaries, “WES Operating”) is a Delaware limited partnership formed in 2007 to acquire, own, develop, and operate midstream assets. As of March 31, 2026, the Partnership owns, directly and indirectly, a 98.1% limited partner interest in WES Operating, and directly owns all of the outstanding equity interests of Western Midstream Operating GP, LLC, which holds the entire non-economic general partner interest in WES Operating. In addition, Occidental owns the Partnership’s general partner and, as of March 31, 2026, a 1.9% limited partner interest in WES Operating through its ownership of WGR Asset Holding Company LLC (“WGRAH”). See Noncontrolling interests below.

For purposes of these consolidated financial statements, the Partnership refers to Western Midstream Partners, LP in its individual capacity or to Western Midstream Partners, LP and its subsidiaries, including Western Midstream Operating GP, LLC and WES Operating, as the context requires. “WES Operating GP” refers to Western Midstream Operating GP, LLC, individually as the general partner of WES Operating. The Partnership’s general partner, Western Midstream Holdings, LLC (the “general partner”), is a wholly owned subsidiary of Occidental Petroleum Corporation. “Occidental” refers to Occidental Petroleum Corporation, as the context requires, and its subsidiaries, excluding the general partner. “Anadarko” refers to Anadarko Petroleum Corporation, which became a wholly owned subsidiary of Occidental as a result of Occidental’s acquisition by merger of Anadarko in 2019. “Related parties” refers to Occidental (see Note 6), the Partnership’s investments accounted for under the equity method of accounting (see Note 7), and WES Operating for transactions with the Partnership that eliminate upon consolidation (see Note 6).

On October 15, 2025, the Partnership completed its previously announced acquisition of Aris Water Solutions, Inc. (“Aris”), pursuant to the Agreement and Plan of Merger, dated as of August 6, 2025 (the “Merger Agreement”), by and among the Partnership, Aris, and certain Partnership and Aris subsidiaries. Also, immediately following the closing of the Aris acquisition, WES Operating and Aris entered into certain post-closing restructuring transactions through which WES Operating issued preferred units to Aris in exchange for Aris’s operating subsidiaries, and WES Operating was the surviving entity in a merger with Aris Water Holdings, LLC, a subsidiary of Aris that was the issuer of its acquired outstanding senior notes (see Note 3).

The Partnership is engaged in the business of gathering, compressing, treating, processing, and transporting natural gas; gathering, stabilizing, and transporting condensate, natural-gas liquids (“NGLs”), and crude oil; and gathering, transporting, recycling, treating, supplying, and disposing of produced water. In its capacity as a natural-gas processor, the Partnership also buys and sells residue, NGLs, and condensate on behalf of itself and its customers under certain contracts. As of March 31, 2026, the Partnership’s assets and investments consisted of the following:

These assets and investments are located in Texas, New Mexico, and the Rocky Mountains (Colorado, Utah, and Wyoming).

Basis of presentation. The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and include the accounts of the Partnership and entities in which it holds a controlling or other financial interest, including WES Operating, WES Operating GP, proportionately consolidated interests, and equity investments. All significant intercompany transactions have been eliminated.

Certain information and note disclosures commonly included in annual financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying consolidated financial statements and notes should be read in conjunction with the Partnership’s 2025 Form 10-K, as filed with the SEC on February 18, 2026. Management believes that the disclosures made are adequate to make the information not misleading.

The consolidated financial results of WES Operating are included in the Partnership’s consolidated financial statements. Throughout these notes to consolidated financial statements, and to the extent material, any differences between the consolidated financial results of the Partnership and WES Operating are discussed separately. The Partnership’s consolidated financial statements differ from those of WES Operating primarily as a result of (i) the presentation of noncontrolling interest ownership (see Noncontrolling interests below), (ii) the elimination of WES Operating GP’s investment in WES Operating with WES Operating GP’s underlying capital account, (iii) the elimination of the preferred unit investment in WES Operating with the Partnership’s underlying preferred capital account (see Note 5), (iv) the general and administrative expenses incurred by the Partnership, which are separate from, and in addition to, those incurred by WES Operating, (v) the inclusion of the impact of Partnership equity balances and Partnership distributions, and (vi) transactions between the Partnership and WES Operating that eliminate upon consolidation.

Use of estimates. In preparing financial statements in accordance with GAAP, management makes informed judgments and estimates that affect the reported amounts of assets, liabilities, revenues, and expenses. Management evaluates its estimates and related assumptions regularly, using historical experience and other reasonable methods. Changes in facts and circumstances or additional information may result in revised estimates, and actual results may differ from these estimates. Effects on the business, financial condition, and results of operations resulting from revisions to estimates are recognized when the facts that give rise to the revisions become known. The information included herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the consolidated financial statements.

Noncontrolling interests. The Partnership’s noncontrolling interests in the consolidated financial statements consist of (i) the 25% third-party interest in Chipeta for all periods presented and (ii) the 1.9%,1.9%, and 2.0% limited partner interest in WES Operating as of March 31, 2026, December 31, 2025, and March 31, 2025, respectively, owned by an Occidental subsidiary. WES Operating’s noncontrolling interest in the consolidated financial statements consists of the 25% third-party interest in Chipeta.

Inventory. As of March 31, 2026, and December 31, 2025, other current assets includes (i) $0.8 million and $2.7 million, respectively, of NGLs inventory and (ii) $14.0 million and $10.1 million, respectively, of materials and supplies inventory that are classified as short term on the consolidated balance sheets. As of March 31, 2026, and December 31, 2025, other assets includes (i) $4.5 million and $3.2 million, respectively, of NGLs line-fill inventory and (ii) $141.9 million and $131.6 million, respectively, of materials and supplies inventory that are classified as long term on the consolidated balance sheets.

Segments. The Partnership’s operations continue to be organized into a single operating segment, the assets of which gather, compress, treat, process, and transport natural gas; gather, stabilize, and transport condensate, NGLs, and crude oil; and gather, transport, recycle, treat, supply and dispose of produced water in the United States. See Note 11.

Equity-based compensation. During the three months ended March 31, 2026 and 2025, the Partnership issued 941,869 and 770,505 common units, respectively, under its long-term incentive plans. Compensation expense was $11.0 million and $8.2 million for the three months ended March 31, 2026 and 2025, respectively.

New accounting pronouncements not yet adopted. In November 2024, the Financial Accounting Standards Board issued Accounting Standards Update 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation (Subtopic 220-40): Disaggregation of Income Statement Expenses.” The standard requires additional disclosure and disaggregation of certain income statement expense line items and may be applied prospectively or retrospectively. The Partnership plans to adopt the standard when it becomes effective beginning with the fiscal-year 2027 annual financial statements. The Partnership is assessing the impact of this guidance on its disclosures in the Notes to the Consolidated Financial Statements.

2. REVENUE FROM CONTRACTS WITH CUSTOMERS

The following table summarizes revenue from contracts with customers:

Contract balances. Receivables from customers, which are included in accounts receivable, net on the consolidated balance sheets, were $807.5 million and $737.0 million as of March 31, 2026, and December 31, 2025, respectively.

Contract assets primarily relate to (i) revenue accrued but not yet billed under cost-of-service contracts with fixed and variable fees and (ii) accrued deficiency fees the Partnership expects to charge customers once the related performance periods are completed. The following table summarizes activity related to contract assets from contracts with customers:

2. REVENUE FROM CONTRACTS WITH CUSTOMERS

Contract liabilities primarily relate to (i) consideration received from customers for which revenue recognition is deferred, (ii) aid-in-construction payments received from customers that must be recognized over the expected period of customer benefit, and (iii) fees that are charged to customers for only a portion of the contract term and must be recognized as revenues over the expected period of customer benefit.

The following table summarizes activity related to contract liabilities from contracts with customers:

Transaction price allocated to remaining performance obligations. Revenues expected to be recognized from certain performance obligations that are unsatisfied (or partially unsatisfied) as of March 31, 2026, are presented in the table below. The Partnership applies the optional exemptions in Revenue from Contracts with Customers (Topic 606) and does not disclose consideration for remaining performance obligations with an original expected duration of one year or less or for variable consideration related to unsatisfied (or partially unsatisfied) performance obligations. Therefore, the following table represents only a portion of expected future revenues from existing contracts, as most future revenues from customers are dependent on future variable customer volumes and, in some cases, variable commodity prices for those volumes.

3. ACQUISITIONS AND DIVESTITURES

Aris. On October 15, 2025, the Partnership closed on the acquisition of Aris by merger in a transaction valued at $2.0 billion, including the cash and equity merger consideration, Aris’s outstanding debt of $80.0 million in revolving credit facility borrowings that were repaid at closing, and $500.0 million in principal amount of senior notes (see Note 9). Based on Aris shareholder consideration elections, the Partnership issued 26.6 million common units and paid $415.0 million in cash, funded with borrowings under the commercial paper program, in exchange for all issued and outstanding shares of Aris common stock. The cash paid to Aris shareholders (net of cash acquired as presented in the table below) was $368.6 million for the year ended December 31, 2025.

The Partnership acquired Aris to expand its existing produced-water infrastructure and access additional customers in the area. The assets acquired, located in Lea and Eddy Counties, New Mexico, and West Texas, include approximately 830 miles of produced-water pipeline,1,812 MBbls/d of produced-water handling capacity,1,560 MBbls/d of water recycling capacity, and 625,000 dedicated acres.

The Aris acquisition has been accounted for under the acquisition method of accounting. The assets acquired and liabilities assumed in the Aris acquisition were recorded in the consolidated balance sheet at their estimated fair values as of the acquisition date. Results of operations attributable to the Aris acquisition were included in the Partnership’s consolidated statements of operations beginning on the acquisition date in the fourth quarter of 2025. For the three months ended March 31, 2026, general and administrative expenses in the consolidated statements of operations include acquisition-related transaction costs of $0.5 million.

The following is the preliminary acquisition-date fair value for the assets acquired and liabilities assumed in the Aris acquisition. Measurement period adjustments recorded during the three months ended March 31, 2026, resulted in a $5.6 million reduction to goodwill. The preliminary fair values are subject to change within the measurement period (up to one year from the acquisition date), pending a final determination of the values assigned to tangible and identifiable intangible assets of approximately $10.0 million.

3. ACQUISITIONS AND DIVESTITURES

Goodwill recognized in the Aris acquisition relates primarily to enhancing and diversifying the Partnership’s water-asset position, as well as delivering operational synergies, including increasing volumes on its existing processing facilities and increasing revenues on its produced-water systems.

Other intangible assets recognized in the Aris acquisition are related to customer contracts. The basis for determining the value of these intangible assets is estimated future net cash flows to be derived from acquired customer contracts and relationships, offset with appropriate charges for the use of contributory assets and discounted using a risk-adjusted discount rate. These intangible assets are being amortized on a straight-line basis over an initial period of 19 years, which represents the estimated term over which the customer contracts are expected to contribute to the Partnership’s cash flows.

The acquisition-date fair values are based on an assessment of the fair value of the assets acquired and liabilities assumed in the Aris acquisition using inputs that are not observable in the market and thus represent Level 3 inputs. The fair values of the produced-water disposal and recycling systems and related facilities and equipment are based on market and cost approaches.

4. PARTNERSHIP DISTRIBUTIONS

Partnership distributions. The Partnership distributes all of its available cash, as defined in the partnership agreement, to unitholders of record on the applicable record date within 55 days following each quarter’s end.

The Board of Directors of the general partner (the “Board”) declared the following cash distributions to the Partnership’s unitholders for the periods presented:

WES Operating partnership distributions. WES Operating makes quarterly cash distributions to the Partnership and WGRAH, a subsidiary of Occidental, according to the terms of its limited partnership agreement. WES Operating made and/or declared the following cash distributions to its limited partners for the periods presented:

5. EQUITY AND PARTNERS’ CAPITAL

Holdings of Partnership equity. The Partnership’s common units are listed on the New York Stock Exchange under the ticker symbol “WES.” As of March 31, 2026, Occidental held 150,374,176 common units, representing a 37.3% limited partner interest in the Partnership, and through its ownership of the general partner, Occidental indirectly held 9,060,641 general partner units, representing a 2.2% general partner interest in the Partnership. The public held 243,401,657 common units, representing a 60.5% limited partner interest in the Partnership. On January 16, 2026, the Partnership and subsidiaries of Occidental entered into a unit redemption agreement (“Unit Redemption Agreement”) providing for the transfer to, and redemption by, the Partnership on February 3, 2026, of approximately 15.3 million common units of the Partnership (see Note 6), valued at $610.0 million.

Partnership equity repurchases. In February 2025, the Board authorized the Partnership to buy back up to $250.0 million of the Partnership’s common units through December 31, 2026 (the “2025 Purchase Program”). The common units may be purchased from time to time in the open market at prevailing market prices or in privately negotiated transactions. During the three months ended March 31, 2026, the Partnership repurchasedno common units. As of March 31, 2026, the Partnership had an authorized amount of $250.0 million remaining under the program.

Holdings of WES Operating equity. On October 15, 2025, WES Operating issued preferred units to Aris, a wholly owned subsidiary of the Partnership, in connection with the Aris acquisition (see Note 1). As of March 31, 2026, (i) the Partnership, directly and indirectly through its ownership of WES Operating GP, owned a 98.1% limited partner interest and the entire non-economic general partner interest in WES Operating and (ii) Occidental, through its ownership of WGRAH, owned a 1.9% limited partner interest in WES Operating, which is reflected as a noncontrolling interest within the consolidated financial statements of the Partnership (see Note 1).

Partnership’s net income (loss) per common unit. The common and general partner unitholders’ allocation of net income (loss) attributable to the Partnership was equal to their cash distributions plus their respective allocations of undistributed earnings or losses in accordance with their weighted-average ownership percentage during each period using the two-class method.

The following table provides a reconciliation between basic and diluted net income (loss) per common unit:

WES Operating’s net income (loss) per common unit. Net income (loss) per common unit for WES Operating is not calculated because it has no publicly traded units.

Summary of related-party transactions. The following tables summarize material related-party transactions included in the Partnership’s consolidated financial statements:

(1)See Note 7.

(2)Includes related-party natural-gas and NGLs imbalances.

(1)See Note 7.

(2)Includes contract liabilities from contracts with customers. See Note 2.

(1)Represents common and general partner unit distributions paid to Occidental pursuant to the partnership agreement of the Partnership. See Note 4 and Note 5.

(2)Represents distributions paid to Occidental, through its ownership of WGRAH, pursuant to WES Operating’s partnership agreement. See Note 4 and Note 5.

The following tables summarize material related-party transactions for WES Operating (which are included in the Partnership’s consolidated financial statements) to the extent the amounts differ materially from the Partnership’s consolidated financial statements:

(1)Includes an intercompany service fee between the Partnership and WES Operating.

(1)Includes balances related to transactions between the Partnership and WES Operating.

(1)Represents distributions paid to the Partnership and Occidental, through its ownership of WGRAH, according to the terms of WES Operating’s partnership agreement. See Note 4 and Note 5.

Related-party revenues. Related-party revenues include amounts earned by the Partnership from services provided to Occidental and from the sale of natural gas, condensate, NGLs, and water solutions volumes to Occidental.

Gathering and processing agreements. The Partnership has significant gathering, treating, processing, stabilization, and produced-water disposal arrangements with affiliates of Occidental on most of its systems. While Occidental is the contracting counterparty of the Partnership, these arrangements with Occidental include not just Occidental-produced volumes, but also, in some instances, the volumes of other working-interest owners of Occidental who rely on the Partnership’s facilities and infrastructure to bring their volumes to market. Natural-gas throughput (excluding equity-investment throughput) attributable to production owned or controlled by Occidental was 33% and 36% for the three months ended March 31, 2026 and 2025, respectively. Crude-oil and NGLs throughput (excluding equity-investment throughput) attributable to production owned or controlled by Occidental was 92% and 91% for the three months ended March 31, 2026 and 2025, respectively. Produced-water throughput attributable to production owned or controlled by Occidental was 38% and 80% for the three months ended March 31, 2026 and 2025, respectively, which decreased primarily due to the addition of third-party volumes from the Aris acquisition.

The Partnership has discussed varying interpretations of certain contractual provisions with Occidental regarding the calculation of the cost-of-service rates under an oil-gathering contract related to the Partnership’s DJ Basin oil-gathering system. If such discussions are resolved in a manner adverse to the Partnership, such resolution could have a negative impact on the Partnership’s financial condition and results of operations, including a reduction in rates and a non-cash charge to earnings.

During the first quarter of 2026, Delaware Basin Midstream LLC (“DBM”), a subsidiary of the Partnership, entered into an amendment (the “GGA Amendment”) to its Delaware Basin gas gathering agreement with Anadarko E&P Onshore LLC (“AEP”), a subsidiary of Occidental, to, among other things, (i) replace its cost-of-service-based gathering fee structure with a fixed-fee structure, (ii) add a new minimum-volume commitment through the end of 2027, and (iii) modify the process for certain dedication-related acreage transfers and releases. On January 16, 2026, and in connection with the GGA Amendment and related transactions, including an agreement between DBM and a subsidiary of ConocoPhillips pursuant to which DBM will gather and process certain volumes of natural gas already existing on the Partnership’s system, and conforming modifications to the terms of the associated processing arrangements between subsidiaries of the Partnership and Occidental, the Partnership and subsidiaries of Occidental also entered into a Unit Redemption Agreement providing for the transfer to, and redemption by, the Partnership on February 3, 2026, of approximately 15.3 million common units of the Partnership, valued at $610.0 million.

As of March 31, 2026, Occidental indirectly holds all of the equity interests of the general partner and, following the consummation of the transactions contemplated by the Unit Redemption Agreement, indirectly holds 38.2% of the Partnership’s outstanding common units. The Unit Redemption Agreement and the GGA Amendment and related transactions were reviewed and approved by the Special Committee of the Board of Directors of the general partner, consisting entirely of independent members of the Board of Directors, and, based upon the recommendation of the Special Committee, the full Board of Directors.

Marketing services. While the Partnership markets and sells substantially all of its crude oil, residue gas, and NGLs directly to third parties, it does still have some marketing agreements with affiliates of Occidental, the activity for which is reflected in the related-party statements of operations above.

Operating leases. Certain surface-use and salt-water disposal agreements between an affiliate of Occidental and certain wholly owned subsidiaries of the Partnership are classified as operating leases (see Related-party commercial agreement below). In addition, the Partnership has operating leases for field offices with Occidental as the lessor.

Related-party expenses. Operation and maintenance expense includes amounts accrued for or paid to related parties for field-related costs, field offices, and easements (see Related-party commercial agreement below) supporting the Partnership’s operations at certain assets. General and administrative expense includes amounts accrued for or paid to Occidental for certain reimbursed expenses pursuant to the provisions of the Partnership’s and WES Operating’s agreements with Occidental. Cost of product expense includes amounts related to certain continuing marketing arrangements with affiliates of Occidental, related-party imbalances, and transactions with affiliates accounted for under the equity method of accounting. See Marketing services in the section above. Related-party expenses bear no direct relationship to related-party revenues, and third-party expenses bear no direct relationship to third-party revenues.

Services Agreement. Occidental performed certain centralized corporate functions for the Partnership and WES Operating pursuant to the agreement dated as of December 31, 2019, between WES Operating GP and Occidental (“Services Agreement”). Most of the administrative and operational services previously provided by Occidental fully transitioned to the Partnership by December 31, 2021, with certain limited transition services remaining in place pursuant to the terms of the Services Agreement.

Construction reimbursement agreements and purchases and sales with related parties. From time to time, the Partnership enters into construction reimbursement agreements with Occidental providing that the Partnership will manage the construction of certain midstream infrastructure for Occidental in the Partnership’s areas of operation. Such arrangements generally provide for a reimbursement of costs incurred by the Partnership on a cost or cost-plus basis.

Additionally, from time to time, in support of the Partnership’s business, the Partnership purchases and sells equipment, inventory, and other miscellaneous assets from or to Occidental or its affiliates.

Related-party commercial agreement. During the first quarter of 2021, an affiliate of Occidental and the Partnership amended certain West Texas surface-use and salt-water disposal agreements to reduce usage fees owed by the Partnership in exchange for the forgiveness of certain deficiency fees owed by Occidental and other unrelated contractual amendments. The present value of the reduced usage fees under the amended agreements was $30.0 million at the time the agreement was executed. As a result of the amendments, (i) these agreements are classified as operating leases and (ii) a right-of-use (“ROU”) asset, included in Other assets on the consolidated balance sheets, was recognized during the first quarter of 2021. The ROU asset is being amortized to Operation and maintenance expense through 2038, the remaining term of the agreements.

Customer concentration. Occidental was the only customer from which revenues exceeded 10% of consolidated revenues for all periods presented in the consolidated statements of operations.

7. EQUITY INVESTMENTS

The following table presents the financial statement impact of the Partnership’s equity investments:

(1)Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, are calculated on an individual-investment basis.

(2)Carrying value reduced tozero as of March 31, 2026, as cumulative equity method losses exceeded our investment balance. Further losses have been suspended as the Partnership has no obligation to fund losses or provide other financial support.

8. SELECTED COMPONENTS OF WORKING CAPITAL

A summary of accounts receivable, net is as follows:

A summary of other current assets is as follows:

A summary of accrued liabilities is as follows:

(1)Includes aid-in-construction reimbursement prepayments, other employee expenses, and Aris-related accruals as of December 31, 2025.

9. DEBT

WES Operating is the borrower for all outstanding debt and is expected to be the borrower for all future debt issuances. The following table presents the outstanding debt:

(1)Fair value is measured using the market approach and Level 2 fair-value inputs.

(2)As of March 31, 2026, maturity dates range from 2028 to 2050.

Debt activity. The following table summarizes the debt activity for the period presented:

WES Operating Senior Notes. Including the effects of the issuance prices, underwriting discounts, and interest-rate adjustments, the effective interest rates of the Senior Notes due 2030 and 2050 were 4.169% and 5.363%, respectively, at March 31, 2026 and 2025. The effective interest rate of these notes is subject to adjustment from time to time due to a change in credit rating.

As of March 31, 2026, the 4.650% Senior Notes due 2026 were classified as short-term debt on the consolidated balance sheet. Subsequent to March 31, 2026, WES Operating retired the 4.650% Senior Notes due 2026 with proceeds from the public offerings of $1.2 billion in aggregate principal amount of Senior Notes issued in the fourth quarter of 2025.

As of March 31, 2026, WES Operating was in compliance with all covenants under the relevant governing indentures.

Revolving credit facility. As of March 31, 2026, there wereno outstanding borrowings, resulting in $2.0 billion in effective borrowing capacity under the RCF. As of March 31, 2026 and 2025, the interest rate on any outstanding RCF borrowings was 4.96% and 5.62%, respectively. The facility-fee rate was 0.20% at March 31, 2026 and 2025. As of March 31, 2026, WES Operating was in compliance with all covenants under the RCF.

Commercial paper program. In November 2023, WES Operating entered into an unsecured commercial paper program under which it may issue (and have outstanding at any one time) an aggregate principal amount up to $2.0 billion. The maturities of the notes may vary but may not exceed 397 days. As of March 31, 2026, there wereno outstanding borrowings under the commercial paper program.

10. COMMITMENTS AND CONTINGENCIES

Environmental obligations. The Partnership is subject to various environmental-remediation obligations arising from federal, state, and local regulations regarding air and water quality, hazardous and solid waste disposal, and other environmental matters. As of March 31, 2026, and December 31, 2025, the consolidated balance sheets included $9.9 million and $10.0 million, respectively, of liabilities for remediation and reclamation obligations. The current portion of these amounts is included inaccrued liabilities, and the long-term portion of these amounts is included in other liabilities. The majority of payments related to these obligations are expected to be made over the next year. See Note 8. As of March 31, 2026, and December 31, 2025, the recorded obligations reflect gross amounts and exclude $5.9 million and $6.5 million, respectively, of anticipated insurance recoveries which are included in accounts receivable, net.

Litigation and legal proceedings. From time to time, the Partnership is involved in legal, tax, regulatory, and other proceedings in various forums regarding performance, contracts, and other matters that arise in the ordinary course of business. Management is not aware of any such proceeding for which the final disposition could have a material adverse effect on the Partnership’s financial condition, results of operations, or cash flows.

Other commitments. The Partnership has payment obligations, or commitments, that include, among other things, a revolving credit facility, other third-party long-term debt, obligations related to the Partnership’s capital spending programs, pipeline and offload commitments, and various operating and finance leases. The payment obligations related to the Partnership’s capital spending programs, the majority of which is expected to be paid in the next 12 months, primarily relate to expansion, construction, and asset-integrity projects at the DBM water systems, West Texas complex, Powder River Basin complex, DJ Basin complex, and DBM oil system.

11. REPORTABLE SEGMENT

Segment overview. The Partnership’s chief operating decision maker (“CODM”) is the Partnership’s President and Chief Executive Officer who assesses performance and allocates resources on a consolidated basis due to the similar nature of services provided to customers across the Partnership’s domestic asset portfolio. The CODM does not assess performance and allocate resources separately for Western Midstream Operating, LP. Accordingly, the Partnership has a single operating and reportable segment, all the assets of which are in the United States and gather, compress, treat, process, and transport natural gas; gather, stabilize, and transport condensate, NGLs, and crude oil; and gather, transport, recycle, treat, supply, and dispose of produced water.

Performance measures. Adjusted EBITDA attributable to Western Midstream Partners, LP (“Adjusted EBITDA”) is used as the performance measure by the Partnership’s CODM in assessing performance and allocating resources to the Partnership’s single operating and reportable segment. Net income (loss) is the most comparable GAAP metric to the performance metric of non-GAAP Adjusted EBITDA. The Partnership defines 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 the Partnership’s core operating performance, and (vii) the noncontrolling interest owners’ proportionate share of revenues and expenses.

Adjusted EBITDA is a non-GAAP financial measure that the CODM utilizes to assess (i) the Partnership’s operating performance as compared to other publicly traded partnerships in the midstream industry, without regard to financing methods, capital structure, or historical cost basis, (ii) the ability of the Partnership’s assets to generate cash flow to make distributions, and (iii) the viability of acquisitions and capital expenditures and the returns on investment of various investment opportunities. The Partnership’s calculation of Adjusted EBITDA may or may not be comparable to similarly titled measures used by others.

11. REPORTABLE SEGMENT

Summarized financial information. The following table presents information about the Partnership’s single operating and reportable segment, including (i) total revenues and other, (ii) significant expenses, and (iii) other segment items:

(1)Includes Service revenue - fee based, Service revenue - product based, and Product sales.

(2)The significant expense categories and amounts align with the information that is regularly provided to the CODM.

(3)General and administrative expense as presented in the consolidated statements of operations less non-cash equity-based compensation expense and non-cash amortization of cloud-computing arrangements.

(4)Includes interest income earned on cash and cash equivalent balances.

(5)Other includes: (i) cost of product, (ii) non-cash equity-based compensation expense, (iii) non-cash amortization of cloud-computing arrangements, (iv) property and other taxes, (v) long-lived asset and other impairments, (vi) gain (loss) on divestiture and other, net, and (vii) gain (loss) on early extinguishment of debt.

The CODM uses consolidated total assets as the measure of the Partnership’s single reportable segment assets. As of March 31, 2026, and December 31, 2025, the consolidated balance sheets includes $14.9 billion and $15.0 billion, respectively, of total assets, which includes $495.8 million and $504.9 million of assets related to equity investments as of March 31, 2026, and December 31, 2025, respectively.

Capital expenditures for additions to long-lived assets were $235.7 million and $142.4 million for the three months ended March 31, 2026 and 2025, respectively.

12. SUBSEQUENT EVENT

Brazos Delaware. On May 6, 2026, the Partnership entered into a definitive agreement pursuant to which the Partnership will acquire all of the outstanding equity interests of Brazos Delaware II, LLC (“Brazos Delaware”) in an equity-and-cash transaction valued at $1.6 billion. Under the terms of the agreement, the Partnership will issue approximately $800.0 million in common units of the Partnership and pay cash consideration of approximately $800.0 million, subject to customary adjustments, to the seller, Brazos Permian II, LLC, at closing. The Partnership expects to fund the non-equity portion of the transaction with cash on hand, borrowings under the RCF, and/or commercial paper. Completion of the transaction is expected to occur in the second quarter of 2026, subject to customary closing conditions and regulatory approvals.

Brazos Delaware is a privately held midstream company that owns a gathering and processing platform in the Texas Delaware Basin, with natural-gas and crude-oil assets spanning Reeves, Ward, Pecos, Winkler, Culberson, and Loving counties. The assets of Brazos Delaware include approximately 900 miles of pipeline,460 MMcf/d of nameplate natural-gas processing capacity at the Comanche Processing Complex, and approximately 470,000 dedicated acres under long-term, fixed-fee contracts.