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Related-Party Transactions
 6 Months Ended
Jun. 30, 2026
Related Party Fees and Other Arrangements, Limited Liability Company (LLC) or Limited Partnership (LP) [Abstract]  
Related-Party Transactions
6. RELATED-PARTY TRANSACTIONS

Summary of related-party transactions. The following tables summarize material related-party transactions included in the Partnership’s consolidated financial statements:
Statements of operations
Three Months Ended 
June 30,		Six Months Ended 
June 30,
thousands2026202520262025
Revenues and other
Service revenues – fee based$542,295 $559,192 $1,080,356 $1,100,937 
Service revenues – product based18,923 12,254 35,949 24,113 
Product sales8,163 4,801 14,018 9,599 
Other643 — 1,160 — 
Total revenues and other570,024 576,247 1,131,483 1,134,649 
Equity income, net – related parties (1)
21,536 27,128 36,312 47,563 
Operating expenses
Cost of product (2)
39,798 (9,028)33,768 (23,042)
Operation and maintenance1,169 1,560 2,618 3,481 
General and administrative— 179 (20)210 
Total operating expenses40,967 (7,289)36,366 (19,351)
Gain (loss) on divestiture and other, net— — 1,366 — 
_________________________________________________________________________________________
(1)See Note 7.
(2)Includes related-party natural-gas and NGLs imbalances.

Balance sheets
thousandsJune 30,
2026		December 31,
2025
Assets
Accounts receivable, net$370,453 $407,941 
Other current assets8,819 524 
Equity investments (1)
493,467 504,859 
Other assets33,311 33,124 
Total assets906,050 946,448 
Liabilities
Accounts and imbalance payables30,545 20,639 
Accrued liabilities (2)
184,974 14,991 
Other liabilities (2)
979,905 631,292 
Total liabilities1,195,424 666,922 
_________________________________________________________________________________________
(1)See Note 7.
(2)Includes contract liabilities from contracts with customers. See Note 2.
6. RELATED-PARTY TRANSACTIONS

Statements of cash flows
Six Months Ended 
June 30,
thousands20262025
Distributions from equity-investment earnings – related parties
$40,375 $51,419 
Contributions to equity investments – related parties(2,578)— 
Distributions from equity investments in excess of cumulative earnings – related parties9,907 14,047 
Distributions to Partnership unitholders (1)
(307,289)(311,914)
Distributions to WES Operating unitholders (2)
(14,505)(14,217)
_________________________________________________________________________________________
(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:
Statements of operations
Three Months Ended 
June 30,		Six Months Ended 
June 30,
thousands2026202520262025
General and administrative (1)
$980 $1,019 $2,480 $2,556 
_________________________________________________________________________________________
(1)Includes an intercompany service fee between the Partnership and WES Operating.

Balance sheets
thousandsJune 30,
2026		December 31,
2025
Other current assets$8,636 $447 
Other assets28,529 29,957 
Accounts and imbalance payables (1)
33,857 76,040 
_________________________________________________________________________________________
(1)Includes balances related to transactions between the Partnership and WES Operating.

Statements of cash flows
Six Months Ended 
June 30,
thousands20262025
Distributions to WES Operating unitholders (1)
$(764,594)$(710,646)
_________________________________________________________________________________________
(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.
6. RELATED-PARTY TRANSACTIONS

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 31% and 32% for the three and six months ended June 30, 2026, respectively, and 36% for both the three and six months ended June 30, 2025. Crude-oil and NGLs throughput (excluding equity-investment throughput) attributable to production owned or controlled by Occidental was 91% and 92% for the three and six months ended June 30, 2026, respectively, and 92% for both the three and six months ended June 30, 2025. Produced-water throughput attributable to production owned or controlled by Occidental was 41% and 40% for the three and six months ended June 30, 2026, respectively, and 79% and 80% for the three and six months ended June 30, 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 third party 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. 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.
6. RELATED-PARTY TRANSACTIONS

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.