Western Midstream Partners, LP

Rocky Mountains regional rollup covering Colorado, Utah and Wyoming: the DJ Basin gathering, treating and processing complex, the DJ Basin crude-oil system, the Chipeta processing complex in Utah, the Powder River Basin complex and the Granger, Red Desert and Rendezvous gathering systems in Wyoming, together with the White Cliffs, GNB NGL, MIGC and OTTCO pipelines. The region carries 3,160 MMcf/d of processing or treating capacity and 232 MBbls/d of liquids capacity across 6,905 miles of gathering and processing pipeline plus 1,557 miles of transportation pipeline, making it the larger of the two regions by gas capacity and by pipeline mileage. Supply is drawn from the Wattenberg field in the DJ Basin, the Uinta Basin via Chipeta's third-party interconnects, the Powder River Basin, and the Moxa Arch, Jonah and Pinedale Anticline fields in southwest Wyoming.

Texas and New Mexico regional rollup: the West Texas gathering, processing and treating complex, the DBM crude-oil gathering and treating system, the DBM produced-water systems, the Mi Vida processing plant, the Brasada complex and the Springfield system, together with the FRP, TEG, TEP and Red Bluff Express pipelines. The region carries 2,620 MMcf/d of processing or treating capacity and 6,072 MBbls/d of processing, treating or disposal capacity across 5,141 miles of gathering and processing pipeline plus 1,307 miles of transportation pipeline. It is the partnership's largest region: West Texas and New Mexico assets alone provided 58% of total revenues and other and all of the produced-water throughput in 2025. Supply comes principally from the Delaware Sands, Avalon Shale, Bone Spring, Wolfcamp and Penn formations in the Delaware Basin portion of the Permian, with South Texas volumes from the Eagle Ford.

Delaware Basin throughput grain spanning the West Texas gathering, processing and treating complex, the DBM crude-oil gathering and treating system and the DBM produced-water systems in West Texas and southeastern New Mexico. Natural-gas throughput rose 9% in 2025 on increased area production and the February 2025 start-up of the North Loving plant, crude-oil and NGLs throughput rose 6%, and produced-water throughput rose 40% on the Aris acquisition and higher production. Occidental accounted for 43% of West Texas complex throughput, 99% of DBM oil system throughput and 61% of DBM water systems throughput in 2025. Because the assets sit on a contiguous interstate network across Texas and New Mexico, no single state locator is assigned.

DJ Basin throughput grain covering the DJ Basin gathering, treating and processing complex and the DJ Basin crude-oil gathering, stabilization and storage system in Colorado, both supplied primarily by the Wattenberg field. Natural-gas throughput rose 2% in 2025 and crude-oil and NGLs throughput rose 5% on increased area production. Occidental accounted for 56% of DJ Basin complex throughput and 98% of DJ Basin oil system throughput in 2025. Excluding equity investments, the DJ Basin assets provided 29% of total revenues and other, 30% of natural-gas throughput and 23% of crude-oil and NGLs throughput.

Powder River Basin throughput grain covering the Powder River Basin gathering, processing and treating complex in northeast Wyoming, which serves conventional and unconventional producing fields in Converse, Campbell, Johnson and Natrona Counties. Natural-gas throughput fell 4% in 2025 while crude-oil and NGLs throughput rose 8%. The three largest third-party customers provided 66% of throughput and Occidental only 3%, making this the least Occidental-dependent of the partnership's core areas.

Eight produced-water gathering, transporting, recycling, treating, supply and disposal systems in West Texas and southeastern New Mexico with 1,637 pipeline miles. Water is gathered and disposed of via subsurface injection or offloaded to third-party providers, with injection wells in Culberson, Loving, Reeves and Ward Counties in Texas and Eddy and Lea Counties in New Mexico. The systems absorbed the Aris water infrastructure acquired in the fourth quarter of 2025, which added approximately 830 miles of produced-water pipeline, 1,812 MBbls/d of handling capacity, 1,560 MBbls/d of recycling capacity and 625,000 dedicated acres, together with the McNeill Ranch land position of 45,700 owned or leased acres in Lea County, New Mexico and Andrews and Gaines Counties, Texas. Occidental provided 61% of 2025 throughput.

Delaware Basin gathering, processing and treating complex comprising 19 processing and treating plants, three gathering systems and 1,920 pipeline miles, including 19 miles of FERC-regulated residue lines exiting the Ramsey and Ranch Westex plants. The complex incorporates the DBM complex, the DBJV and Haley systems and the Ranch Westex processing plant. The North Loving plant was completed during 2025, adding 250 MMcf/d of processing capacity. Supply comes from the Delaware Sands, Avalon Shale, Bone Spring, Wolfcamp and Penn formations. Lean gas is delivered into Enterprise GC's pipeline for ultimate delivery to Energy Transfer's Oasis pipeline; residue gas moves to Red Bluff Express, Agua Blanca, Oasis, Transwestern and Kinder Morgan's interstate system; NGLs go primarily to the Sand Hills, Lone Star and Coastal Bend pipelines. Occidental provided 43% of 2025 throughput and the two largest third-party customers 29%.

Colorado gathering, treating and processing complex comprising the Platte Valley, Fort Lupton, Wattenberg, Lancaster and Latham processing plants and the Wattenberg gathering system, with 17 processing and treating plants, two gathering systems and 1,677 pipeline miles. Supply comes primarily from the Wattenberg field. Residue takeaway runs through the CIG pipeline, Tallgrass Energy's Cheyenne Connector and Xcel Energy's residue pipelines; NGLs takeaway through Overland Pass, FRP and DCP's Wattenberg NGL pipeline, with fractionators and a truck-loading facility at the Platte Valley and Wattenberg plants providing access to local NGLs markets. Occidental provided 56% of 2025 throughput and the two largest third-party customers 30%.

Produced-water infrastructure sanctioned in January 2025 and expected to be completed by the first quarter of 2027, comprising a 42-mile, 30-inch pipeline with capacity to transport over 800 MBbls/d of produced water to additional disposal facilities in eastern Loving County within the Delaware Basin, and three regional clean-water handling facilities with total incremental capacity of approximately 280 MBbls/d. The partnership also executed an agreement for incremental disposal capacity which, together with the construction of additional disposal facilities in eastern Loving County, will support the Pathfinder project and existing disposal obligations.

Uinta Basin processing complex in Utah comprising three processing plants and four pipeline miles, in which the partnership is managing member and owns a 75% interest. Chipeta's inlet connects to Caerus Uinta's gathering system, the MountainWest Pipeline, Three Rivers Gathering operated by Harvest Midstream and Kinder Morgan's Altamont Green River Pipeline; interconnect facilities completed during 2025 accommodate up to 150 MMcf/d of receipts from the Altamont Green River line. NGLs move via the GNB NGL pipeline to Enterprise's MAPL and Seminole pipelines and ultimately to Mont Belvieu, while residue gas reaches Rockies and Western U.S. markets through the CIG, MountainWest and WIC pipelines. Throughput was from numerous third-party customers, the five largest providing 85%.

Northeast Wyoming gathering, processing and treating complex comprising the Hilight system plus assets acquired from Meritage - the Steamboat and 50 Buttes gas-processing plants, the Buckshot amine plant, the Thunder Creek gathering system and the Thunder Creek NGL pipeline - with six processing and treating plants, two gathering systems and 2,685 pipeline miles including 120 miles of FERC-regulated NGLs pipeline. The complex serves conventional and unconventional fields in Converse, Campbell, Johnson and Natrona Counties. Hilight delivers residue gas to the partnership's MIGC transmission line and, lacking an active NGLs pipeline connection, sells fractionated NGLs locally by truck and rail. Steamboat and 50 Buttes deliver gas to WIC's Thunder Creek and Chalk Buttes points and NGLs via Thunder Creek to ONEOK's Well Draw point.

Delaware Basin crude-oil gathering and treating system comprising five central production facilities, two regional oil treating facilities and three combined oil transfer and treating facilities across 19 sites, one gathering system and 674 pipeline miles including 15 miles of crude-oil transportation pipeline. The system is supplied from Delaware Basin production and delivers treated crude oil into Plains All American Pipeline. Occidental provided 99% of 2025 throughput and its volumes are subject to the Texas Railroad Commission tariff. Fee-based service revenue rose $32.6 million in 2025 on increased throughput, higher average fees from cost-of-service rate redeterminations effective January 1, 2025, and deficiency fees on contracts with increasing throughput minimums.

Cryogenic processing train under construction in the North Loving area of the West Texas complex, with a capacity of 300 MMcf/d and expected completion in the second quarter of 2027. On completion the West Texas complex will have total processing capacity of 2,490 MMcf/d, up from 2,190 MMcf/d at December 31, 2025. The train follows the North Loving plant, which was completed in late February 2025 and added 250 MMcf/d of processing capacity to the complex.

South Texas gathering, processing and treating complex with three processing and treating plants, one gathering system and 58 pipeline miles. The complex receives gas from the Springfield gas-gathering system and operates in the Eagle Ford fairway. It is the smallest of the partnership's wholly-owned processing complexes by capacity and pipeline mileage.

Single 200 MMcf/d cryogenic processing plant in the Delaware Basin in which the partnership holds a 50% interest; the plant is operated by a third party. Mi Vida receives volumes from the West Texas complex and Energy Transfer's gathering system, delivers residue gas to the Oasis or Transwestern pipelines and NGLs to the Lone Star pipeline. Throughput was from multiple third-party customers at December 31, 2025. Agreements executed in the fourth quarter of 2024 realigned the commercial structure and provided the partnership with 100 MMcf/d of dedicated Delaware Basin processing capacity beginning in mid-2025. Volumes are reported within equity-investment throughput rather than consolidated throughput.

Colorado crude-oil gathering, stabilization and storage system with six treating and stabilization facilities, one gathering system and 462 pipeline miles including 12 miles of crude-oil transportation pipeline. The system gathers high-vapour-pressure crude oil, primarily from the Wattenberg field, and delivers it to the centralized oil stabilization facility, which houses two 250,000 barrel crude-oil storage tanks. The facility has market access to the White Cliffs, Saddlehorn and Pony Express pipelines, rail-loading facilities in Tampa, Colorado, and local markets. Occidental provided 98% of 2025 throughput.

South Texas gas- and oil-gathering and treating system in which the partnership owns a 50.1% interest and serves as operator, comprising three treating plants, two gathering systems and 852 pipeline miles. The gas-gathering system delivers to the Brasada complex and to interruptible points at the Raptor plant owned by Carnero G&P and operated by Targa and the Dos Hermanos plant owned and operated by Energy Transfer. The oil-gathering system delivers to Plains All American, Kinder Morgan's Double Eagle Pipeline, Hilcorp's Harvest Pipeline and NuStar's pipeline. Fee-based service revenue fell $32.4 million in 2025 on decreased throughput and lower annual cumulative catch-up adjustments for cost-of-service changes in estimated consideration.

Wholly-owned FERC-regulated NGLs pipeline in Utah carrying NGLs from the Chipeta processing complex to Enterprise's Mid-America Pipeline, which provides onward transportation through the Seminole pipeline and TEP to the NGLs fractionation and storage facilities at Mont Belvieu, Texas. The 10-K discloses pipeline mileage and ownership interest for this line but publishes no throughput capacity, per-pipeline volume or tariff rate, so no capacity, throughput or fee row is emitted.

Southwest Wyoming natural-gas gathering system with one gathering system and 742 pipeline miles, supplied by the Moxa Arch, Jonah and Pinedale Anticline fields. Residue gas is delivered to a third party for processing and can then move to the CIG pipeline, Williams' MountainWest, Overthrust and Northwest pipelines, the partnership's OTTCO pipeline and its Mountain Gas Transportation pipeline; NGLs have market access to the MAPL pipeline terminating at Mont Belvieu and to local markets. Throughput was from numerous third-party customers, with the two largest customers providing 70%. The 10-K publishes no processing, treating or disposal capacity for this system because it provides gathering service only, and no per-system throughput or fee figures are disclosed.

Wholly-owned FERC-regulated natural-gas transmission line in northeast Wyoming receiving residue gas from the Hilight plant at the Powder River Basin complex. Its operations are subject to FERC regulation under the Natural Gas Act of 1938, covering rates, services, facility certification, capacity management and market conduct. The 10-K discloses pipeline mileage and ownership interest for this line but publishes no throughput capacity, per-pipeline volume or tariff rate, so no capacity, throughput or fee row is emitted.

Wholly-owned natural-gas pipeline in southwest Wyoming that receives residue gas from the Granger complex. The 10-K discloses pipeline mileage and ownership interest for this line but publishes no throughput capacity, per-pipeline volume or tariff rate, so no capacity, throughput or fee row is emitted.

Southwest Wyoming natural-gas gathering system with one gathering system and 1049 pipeline miles, gathering and compressing natural gas produced from the eastern portion of the Greater Green River Basin and delivering to a third party for processing. Throughput was from numerous third-party customers, with the three largest customers providing 55%. The 10-K publishes no processing, treating or disposal capacity for this system because it provides gathering service only, and no per-system throughput or fee figures are disclosed.

FERC-regulated NGLs pipeline providing takeaway capacity from the DJ Basin in northeast Colorado, with receipt points at gas plants in Weld and Adams Counties including the DJ Basin complex, connecting to TEP near Skellytown, Texas. Operated by a third party; multiple committed shippers including Occidental at December 31, 2025, with capacity available to other shippers at the posted FERC tariff rate. The 10-K discloses pipeline mileage and ownership interest for this line but publishes no throughput capacity, per-pipeline volume or tariff rate, so no capacity, throughput or fee row is emitted.

FERC-regulated natural-gas pipeline transporting gas from Reeves and Loving Counties, Texas to the WAHA hub in Pecos County. It is supplied by production from the West Texas complex and other third-party plants. Operated by a third party; multiple committed shippers including Occidental at December 31, 2025. Volumes rose in 2025 following the addition of a new receipt point beginning in November 2024. The 10-K discloses pipeline mileage and ownership interest for this line but publishes no throughput capacity, per-pipeline volume or tariff rate, so no capacity, throughput or fee row is emitted.

High-pressure natural-gas gathering system in southwest Wyoming in which the partnership holds a 22% interest; the system is operated by a third party and comprises one gathering system with 286 pipeline miles. Rendezvous gathers gas from the Jonah and Pinedale Anticline fields and delivers to Harvest Midstream's Blacks Fork gas-processing plant, which connects to the MountainWest, Northwest and Kern River pipelines via the Rendezvous pipeline. Throughput was primarily from two shippers with acreage dedicated to the system. Volumes are reported within equity-investment throughput. No capacity, per-system throughput or fee figures are disclosed for this system.

Two NGLs gathering systems providing plants in North Texas and the Texas panhandle with access to NGLs takeaway capacity on the Texas Express Pipeline. Operated by a third party; one committed shipper at December 31, 2025. The 10-K discloses pipeline mileage and ownership interest for this line but publishes no throughput capacity, per-pipeline volume or tariff rate, so no capacity, throughput or fee row is emitted.

FERC-regulated NGLs pipeline delivering to Enterprise's NGLs fractionation and storage facility at Mont Belvieu, Texas. It is supplied with NGLs from FRP, the MAPL pipeline and TEG. Operated by a third party; multiple committed shippers including Occidental at December 31, 2025, with capacity available to other shippers at posted FERC tariff rates. Lower TEP volumes contributed to the 2025 decline in crude-oil and NGLs throughput attributable to the partnership. The 10-K discloses pipeline mileage and ownership interest for this line but publishes no throughput capacity, per-pipeline volume or tariff rate, so no capacity, throughput or fee row is emitted.