The completed transaction adds a 320 MMcf/d gas processing complex, approximately 145 miles of gathering pipelines and nine customers across West Texas and southeast New Mexico.
Published by Allstream Insiders.
Allstream Insiders Summary
San Mateo Midstream has completed its $752 million acquisition of Cardinal Midstream’s operating subsidiaries, adding natural gas gathering and processing infrastructure across the northern Delaware Basin.
The transaction closed on August 3, 2026, subject to customary post-closing adjustments. San Mateo is a midstream joint venture owned 51% by Matador Resources Company and 49% by Five Point Infrastructure. Cardinal Midstream was backed by EnCap Flatrock Midstream.
The acquired system includes:
- A natural gas processing complex in Loving County, Texas, with approximately 320 MMcf/d of designed inlet capacity.
- Approximately 145 miles of low- and high-pressure natural gas gathering pipelines across West Texas and southern Eddy County, New Mexico.
- Two residue-gas takeaway connections and four natural gas liquids takeaway connections at the processing complex.
- Nine natural gas gathering and processing customers that are new to San Mateo.
- 26 Cardinal field employees, all of whom accepted employment offers from San Mateo.
Matador reports that the completed acquisition increases San Mateo’s designed natural gas processing capacity to more than 1 Bcf/d and its natural gas gathering network to more than 800 miles.
San Mateo Completes the Cardinal Midstream Acquisition
The August 3 closing moves the Cardinal transaction from a proposed acquisition into San Mateo’s operating portfolio. San Mateo acquired Cardinal Delaware Basin, LLC and Cardinal New Mexico, LLC, the operating subsidiaries that held Cardinal’s Delaware Basin gathering and processing assets.
The parties originally announced the agreement on June 29, 2026, with total cash consideration of $752 million. The closing release retained that value while adding the customary qualification that the amount remains subject to post-closing adjustments.
Joseph Wm. Foran, Matador’s founder, chairman and chief executive officer and San Mateo’s founder, described the closing as “another important catalyst and milestone” in building San Mateo’s Delaware Basin midstream business.
San Mateo’s ownership did not change with the acquisition. Matador continues to hold 51%, while an affiliate of Five Point Infrastructure owns the remaining 49%.
Cardinal Midstream Asset Overview
The Cardinal acquisition expands San Mateo’s physical position in the northern Delaware Basin rather than adding an undeveloped project. The processing complex and gathering lines were operating Cardinal assets at the time of the transaction.
| Acquired Cardinal asset or operating component | Location | Company-reported scale | Transaction status |
|---|---|---|---|
| Natural gas processing complex | Loving County, Texas | Approximately 320 MMcf/d of designed inlet capacity | Acquired by San Mateo on August 3, 2026 |
| Natural gas gathering system | West Texas and southern Eddy County, New Mexico | Approximately 145 miles of low- and high-pressure pipelines | Acquired and added to San Mateo’s network |
| Processing-site footprint | Loving County, Texas | Approximately 75 acres | Provides space for potential future expansion |
| Residue-gas takeaway connections | Cardinal processing complex | Two connections | Part of the acquired operating system |
| NGL takeaway connections | Cardinal processing complex | Four connections | Part of the acquired operating system |
| Customer base | Northern Delaware Basin | Nine new natural gas customers for San Mateo | Added at closing |
| Field workforce | Cardinal operations | 26 employees | All accepted San Mateo employment offers |
The existing takeaway connections and 75-acre site give San Mateo options for future processing expansion, but the company has not presented those features as a separately sanctioned capacity project. They should be viewed as expansion capability within the acquired footprint rather than an announced construction program.
San Mateo’s Processing Capacity Exceeds 1 Bcf/d
Matador now describes San Mateo as having more than 1 Bcf/d of designed natural gas processing capacity. The company also reports more than 800 miles of natural gas gathering pipelines following the Cardinal closing.
The acquisition places the Loving County processing complex alongside San Mateo’s existing northern Delaware Basin plants, including the Marlan Processing Plant and Black River Processing Plant in Eddy County, New Mexico.
San Mateo said the combined system increases its ability to move natural gas across the northern Delaware Basin and provides additional flow assurance for Matador and third-party producers. The June transaction announcement identified potential movement between the Cardinal complex and the Marlan and Black River plants as a strategic benefit of the combination.
The closing release does not establish that every proposed interconnection or optimization project is complete. Integration should therefore be treated as an operating program following closing, with future physical modifications evaluated as San Mateo discloses them.
Nine Customers and 26 Field Employees Join San Mateo
The Cardinal transaction adds nine natural gas customers that were not previously served by San Mateo. Matador described the group as a mix of major, mid-cap and private Delaware Basin producers.
The closing also transfers the operating knowledge behind the assets. San Mateo offered employment to 26 Cardinal field employees, and Matador reported that all 26 accepted.
Matador said nearly 100 drilling rigs were located within ten miles of the combined gathering and processing system when it announced the closing. That figure describes nearby activity and potential commercial reach; it does not represent contracted volumes, dedicated acreage or awarded expansions.
The Cardinal System Connects Texas and New Mexico Operations
The acquired gathering footprint runs through West Texas and southern Eddy County, New Mexico, while the processing complex is located in Loving County, Texas, immediately south of the New Mexico border.
This location fills a geographic gap between San Mateo’s existing northern Delaware Basin infrastructure and producer activity in Loving County and southeast New Mexico. Matador has also identified the Cardinal system as a processing option for development around its federal lease acreage in Lea County, New Mexico, and its Wolf asset area in Loving County.
The combination gives San Mateo a larger platform for gathering, treating and processing natural gas while retaining its existing oil gathering, transportation, produced-water gathering and disposal services. The acquired Cardinal assets themselves are principally natural gas gathering and processing infrastructure.
Allstream Perspective
The Cardinal closing gives San Mateo immediate operating scale rather than a long-dated development position. The 320 MMcf/d processing complex, 145-mile gathering system, customer relationships and field workforce are now part of San Mateo’s northern Delaware Basin platform.
For contractors and suppliers, the post-closing integration could involve pipeline interconnections, metering, compression, controls, automation, communications, electrical work, integrity management, inspection and operating-support services. Those work categories are Allstream analysis of the acquired gathering and processing scope; Matador and San Mateo have not announced corresponding bid packages, contractor selections or procurement schedules.
The principal milestones to monitor are physical integration of the Cardinal, Marlan and Black River systems, utilization of the acquired processing capacity and any separately approved expansion at the Loving County complex. The site’s acreage and takeaway connections create room for additional infrastructure, but a future project should not be assumed until San Mateo defines its scope, budget and schedule.
