Western Midstream Operating, LP

The following sections describe in more detail the services provided by our assets in our areas of operation as of December 31, 2025.

GATHERING, PROCESSING, TREATING, AND DISPOSAL

Overview - Texas and New Mexico

(1)Includes 215 MMcf/d of bypass capacity at the West Texas complex.

(2)Includes 19 miles of transportation related to the residue lines (regulated by FERC) at the West Texas complex and 15 miles of transportation related to a crude-oil pipeline at the DBM oil system.

(3)The West Texas complex includes the DBM complex, DBJV and Haley systems, and the Ranch Westex processing plant.

(4)The DBM oil system includes five central production facilities, two regional oil treating facilities, and three combined oil transfer/treating facilities.

(5)The DBM water systems include assets acquired from Aris.

(6)We own a 50% interest in Mi Vida, which owns a processing plant operated by a third party.

(7)We own a 50.1% interest in the Springfield system and serve as the operator.

West Texas and New Mexico

West Texas gathering, processing, and treating complex

During the year ended December 31, 2025, the North Loving plant was completed, adding 250 MMcf/d of processing capacity to the complex.

•Customers. For the year ended December 31, 2025, Occidental’s production represented 43% of the West Texas complex throughput, and the two largest third-party customers provided 29% of the throughput.

•Supply. Supply of gas and NGLs for the complex comes from production from the Delaware Sands, Avalon Shale, Bone Spring, Wolfcamp, and Penn formations in the Delaware Basin portion of the Permian Basin.

•Delivery points. Gas is dehydrated, compressed, and delivered within the West Texas complex and to the Mi Vida plant (see below) for processing, while lean gas is delivered into Enterprise GC, L.P.’s pipeline for ultimate delivery into Energy Transfer LP’s (“ET”) Oasis pipeline (the “Oasis pipeline”). Residue gas from the West Texas complex is delivered to the Red Bluff Express pipeline, Whitewater Midstream, LLC’s Agua Blanca pipeline, Oasis pipeline, Transwestern Pipeline Company LLC’s pipeline (“Transwestern pipeline”), and Kinder Morgan, Inc.’s interstate pipeline system. NGLs production is primarily delivered into the Sand Hills pipeline, Lone Star NGL LLC’s pipeline (“Lone Star pipeline”), and Coastal Bend NGL pipeline.

•North Loving Train II. We are currently constructing a new cryogenic processing train in the North Loving area of our West Texas complex. The North Loving Train II will have a capacity of 300 MMcf/d and is expected to be completed in the second quarter of 2027. Upon completion, the West Texas complex will have a total processing capacity of 2,490 MMcf/d.

DBM oil-gathering system, treating facilities, and storage

•Customers. As of December 31, 2025, DBM oil system throughput was from Occidental and one third-party producer. For the year ended December 31, 2025, Occidental’s production represented 99% of the total DBM oil system throughput and is subject to the Texas Railroad Commission tariff.

•Supply. The DBM oil system is supplied from production from the Delaware Basin portion of the Permian Basin.

•Delivery points. Crude oil treated at the DBM oil system is delivered into Plains All American Pipeline.

DBM produced-water systems

During the year ended December 31, 2025, the Partnership completed the Aris acquisition (see Acquisitions and Divestitures within these Items 1 and 2 for additional information).

•Customers. As of December 31, 2025, DBM water systems throughput was from Occidental and numerous third-party producers, with Occidental’s production representing 61% of the throughput.

•Supply. Supply of produced water for the systems comes from crude-oil production from the Delaware Basin portion of the Permian Basin.

•Disposal. The DBM water systems gather and dispose of produced water via subsurface injection or offload to third-party service providers. The systems’ injection wells are located in Culberson, Loving, Reeves, and Ward Counties in Texas, and Eddy and Lea Counties in New Mexico.

•Water Solutions. The DBM water systems now include significant water supply infrastructure from the Aris acquisition. The DBM water systems now manage 1,560 MBbls/d of produced-water recycling capacity and 19,539 MBbls of water storage capacity in New Mexico and Texas.

•McNeill Ranch. As part of the Aris acquisition, the Partnership owns or leases 45,700 acres of land stretching over Lea County in New Mexico, and Andrews and Gaines Counties in Texas.

•In January 2025, we sanctioned the construction of (i) a 42-mile, 30-inch pipeline with the capacity to transport over 800 MBbls/d of produced water to additional disposal facilities in eastern Loving County within the Delaware Basin, and (ii) three regional clean-water handling facilities with total incremental capacity of approximately 280 MBbls/d. We also executed an agreement for incremental disposal capacity to support the Pathfinder pipeline project which, in addition to the construction of additional disposal facilities in eastern Loving County, will support existing disposal obligations. Construction is expected to be completed by the first quarter of 2027.

Mi Vida processing plant

•Customers. As of December 31, 2025, Mi Vida plant throughput was from multiple third-party customers.

•Supply and delivery points. The Mi Vida plant receives volumes from the West Texas complex and ET’s gathering system. Residue gas from the Mi Vida plant is delivered to the Oasis pipeline or Transwestern pipeline. NGLs production is delivered to the Lone Star pipeline.

•During the fourth quarter of 2024, we executed agreements to realign the commercial structure of Mi Vida, which provided us with 100 MMcf/d of dedicated natural-gas processing capacity in the Delaware Basin beginning in mid-2025.

South Texas

Brasada gathering, stabilization, treating, and processing complex

•Customers. For the year ended December 31, 2025, Brasada complex throughput was from one third-party customer.

•Supply. Supply of gas and NGLs is sourced from throughput gathered by the Springfield system.

•Delivery points. The facility delivers residue gas to the Eagle Ford Midstream system operated by NET Midstream, LLC. Stabilized condensate is delivered to Plains All American Pipeline, and NGLs are delivered to the Enterprise-operated South Texas NGL Pipeline System.

Springfield gathering system, stabilization facility, and storage

•Customers. For the year ended December 31, 2025, Springfield system throughput was from multiple third-party customers.

•Supply. Supply of gas and oil is sourced from third-party production in the Eagle Ford Shale Play.

•Delivery points. The gas-gathering system has a delivery point to our Brasada complex and other interruptible points (the Raptor processing plant owned by Carnero G&P LLC and operated by Targa Resources Corp. and the Dos Hermanos plant owned and operated by ET). The oil-gathering system delivers oil to Plains All American Pipeline, Kinder Morgan, Inc.’s Double Eagle Pipeline, Hilcorp Energy Company’s Harvest Pipeline, and NuStar Energy L.P.’s Pipeline.

Overview - Rocky Mountains - Colorado and Utah

(1)Includes 250 MMcf/d of bypass capacity at the DJ Basin complex.

(2)Includes 12 miles of transportation related to a crude-oil pipeline at the DJ Basin oil system.

(3)The DJ Basin complex includes the Platte Valley, Fort Lupton, Wattenberg, Lancaster, and Latham processing plants, and the Wattenberg gathering system.

(4)We are the managing member and own a 75% interest in Chipeta, which owns the Chipeta processing complex.

Colorado

DJ Basin gathering, treating, and processing complex

•Customers. For the year ended December 31, 2025, Occidental’s production represented 56% of the DJ Basin complex throughput, and the two largest third-party customers provided 30% of the throughput.

•Supply. The DJ Basin complex is supplied primarily by the Wattenberg field.

•Delivery points. As of December 31, 2025, the DJ Basin complex had various delivery-point interconnections with DCP Midstream LP’s (“DCP”) gathering and processing system for gas not processed within the DJ Basin complex. The DJ Basin complex is connected to the Colorado Interstate Gas Company LLC’s pipeline (“CIG pipeline”), Tallgrass Energy’s Cheyenne Connector pipeline, and Xcel Energy’s residue pipelines for natural-gas residue takeaway and to Overland Pass Pipeline Company LLC’s pipeline, FRP’s pipeline, and DCP’s Wattenberg NGL pipeline for NGLs takeaway. In addition, the NGLs fractionators and associated truck-loading facility at the Platte Valley and Wattenberg plants provide access to local NGLs markets.

DJ Basin oil-gathering system, stabilization facility, and storage

•Customers. As of December 31, 2025, DJ Basin oil system throughput was from Occidental and two third-party producers. For the year ended December 31, 2025, Occidental’s production represented 98% of the total DJ Basin oil system throughput.

•Supply. The DJ Basin oil system, which is supplied primarily by the Wattenberg field, gathers high-vapor-pressure crude oil and delivers it to the centralized oil stabilization facility (“COSF”). The COSF includes two 250,000 barrel crude-oil storage tanks.

•Delivery points. The COSF has market access to the White Cliffs pipeline, Saddlehorn pipeline, Tallgrass Energy’s Pony Express pipeline and rail-loading facilities in Tampa, Colorado, and local markets.

Utah

Chipeta processing complex

During the year ended December 31, 2025, Chipeta completed interconnect facilities to accommodate up to 150 MMcf/d of gas receipts from Kinder Morgan’s Altamont Green River Pipeline.

•Customers. For the year ended December 31, 2025, Chipeta complex throughput was from numerous third-party customers, with the five largest customers providing 85% of the throughput.

•Supply. Chipeta’s inlet is connected to Caerus Uinta LLC’s gathering system, the MountainWest Pipeline, LLC system (“MountainWest Pipeline”), Three Rivers Gathering, LLC’s system, which is operated by Harvest Midstream, and Kinder Morgan’s Altamont Green River Pipeline.

•Delivery points. The Chipeta plant delivers NGLs via the GNB NGL pipeline to Enterprise’s Mid-America Pipeline Company pipeline (“MAPL pipeline”), which provides transportation through Enterprise’s Seminole pipeline (“Seminole pipeline”) and TEP’s pipeline in West Texas, and ultimately to the NGLs fractionation and storage facilities in Mont Belvieu, Texas. The Chipeta plant has residue gas delivery points through the CIG pipeline, MountainWest Pipeline, and Wyoming Interstate Company’s pipeline (“WIC pipeline”) that deliver residue gas to markets throughout the Rockies and Western United States.

Overview - Rocky Mountains - Wyoming

(1)Includes 120 miles of transportation related to a FERC-regulated NGLs pipeline at the Powder River Basin complex.

(2)The Powder River Basin complex includes the Hilight system and assets acquired from Meritage (Steamboat and 50 Buttes gas-processing plants, Buckshot amine plant, Thunder Creek gathering system, and Thunder Creek NGL pipeline).

(3)We have a 22% interest in the Rendezvous gathering system, which is operated by a third party.

Northeast Wyoming

Powder River Basin gathering, processing, and treating complex

•Customers. For the year ended December 31, 2025, the three largest third-party customers provided 66% of the throughput, and Occidental’s production represented 3% of the Powder River Basin complex throughput.

•Supply. The Powder River Basin complex serves the gas-gathering needs of several conventional and unconventional producing fields in Converse, Campbell, Johnson, and Natrona Counties, Wyoming.

•Delivery points. The Hilight plant delivers residue gas to our MIGC transmission line (see Transportation within these Items 1 and 2). Hilight is not connected to an active NGLs pipeline, resulting in all fractionated NGLs being sold locally through truck and rail loading facilities. The Steamboat and 50 Buttes gas-processing plants deliver natural gas to the Thunder Creek and Chalk Buttes delivery points owned by Wyoming Interstate Company (“WIC”), a subsidiary of Kinder Morgan, Inc. The NGLs from the Steamboat and 50 Buttes gas-processing plants, as well as EOG’s Jewell gas-processing plant, are delivered via our Thunder Creek NGL pipeline to ONEOK, Inc.’s Well Draw delivery point.

Southwest Wyoming

Granger gathering system

•Customers. For the year ended December 31, 2025, Granger complex throughput was from numerous third-party customers, with the two largest customers providing 70% of the throughput.

•Supply. The Granger complex is supplied by the Moxa Arch, Jonah, and Pinedale Anticline fields.

•Delivery points. Residue gas from the Granger complex is delivered to a third party for processing and can then be delivered to the CIG pipeline; The Williams Companies, Inc.’s MountainWest Pipeline, Overthrust Pipeline, and Northwest Pipeline (“NWPL”); our OTTCO pipeline; and our Mountain Gas Transportation LLC pipeline. The NGLs have market access to the MAPL pipeline, which terminates at Mont Belvieu, Texas, and other local markets.

Red Desert gathering system

•Customers. For the year ended December 31, 2025, Red Desert complex throughput was from numerous third-party customers, with the three largest customers providing 55% of the throughput.

•Supply and delivery points. The Red Desert complex gathers and compresses natural gas produced from the eastern portion of the Greater Green River Basin and delivers to a third party for processing.

Rendezvous gathering system

•Customers. For the year ended December 31, 2025, Rendezvous system throughput primarily was from two shippers that have dedicated acreage to the system.

•Supply and delivery points. The Rendezvous system provides high-pressure gathering service for gas from the Jonah and Pinedale Anticline fields and delivers to Harvest Midstream’s Blacks Fork gas-processing plant, which connects to the MountainWest Pipeline, NWPL, and the Kern River pipeline via the Rendezvous pipeline.

TRANSPORTATION

(1)Regulated by FERC.

(2)Operated by a third party.

Rocky Mountains - Colorado

White Cliffs pipeline. The White Cliffs dual pipeline system had multiple committed shippers, including Occidental, as of December 31, 2025. Other parties may also ship on the White Cliffs pipeline at FERC-based rates. The pipeline provides crude-oil and NGLs takeaway capacity from Platteville, Colorado, to ET’s storage facility in Cushing, Oklahoma, which ultimately delivers to Gulf Coast and mid-continent refineries. It is supplied by production from the DJ Basin. At the point of origin, there is a storage facility adjacent to a truck-unloading facility.

Texas

Front Range Pipeline. FRP provides NGLs takeaway capacity from the DJ Basin in Northeast Colorado. FRP has receipt points at gas plants in Weld and Adams Counties, Colorado (including the DJ Basin complex) (see Rocky Mountains—Colorado and Utah within these Items 1 and 2). FRP connects to TEP near Skellytown, Texas. As of December 31, 2025, the pipeline had multiple committed shippers, including Occidental. FRP provides capacity to other shippers at the posted FERC tariff rate.

Texas Express Gathering. TEG consists of two NGLs gathering systems that provide plants in North Texas and the Texas panhandle with access to NGLs takeaway capacity on TEP. TEG had one committed shipper as of December 31, 2025.

Texas Express Pipeline. TEP delivers to Enterprise’s NGLs fractionation and storage facility in Mont Belvieu, Texas. TEP is supplied with NGLs from other pipelines or systems including FRP, the MAPL pipeline, and TEG. As of December 31, 2025, the pipeline had multiple committed shippers, including Occidental. TEP provides capacity to other shippers at the posted FERC tariff rates.

Red Bluff Express pipeline. As of December 31, 2025, the Red Bluff Express pipeline had multiple committed shippers, including Occidental. The pipeline also provides capacity to other shippers at the posted FERC-based rates. The pipeline is supplied by production from our West Texas complex and other third-party plants. The Red Bluff Express pipeline transports natural gas from Reeves and Loving Counties, Texas, to the WAHA hub in Pecos County, Texas.