Quick answer: Valor's Mcmullen County, Texas rankings show the 23 operators producing the most oil and gas here — Marathon Oil Company leads — from Texas Railroad Commission filings over the last six months. If you own minerals in Mcmullen County, these operators are your likely check-writers. Valor verifies the operator on your tract, audits every royalty check, and recovers suspended funds. Valor manages minerals; it never buys them.
The top 23 oil and gas operators in Mcmullen County, Texas, ranked by monthly oil production. Combined output of all 25 reporting operators: 81,879,587 BBL oil and 173,640,730 Mcf gas across 1,551 reporting wells/leases.
Momentum blends the year-over-year change in average monthly production (oil + gas at 6 Mcf per BOE, 2025-11 – 2026-05 vs the same months a year earlier, complete reporting months only) with the change in drilling permits (last 12 months vs the prior 12: 110 vs 144). Each input is capped at ±100%.
Benchmark gross value of production: about $210.4M per month — 1,925,904 bbl of oil and 16,015,020 Mcf of gas a month, priced at the EIA average WTI ($73.03/bbl) and Henry Hub ($4.20/MMBtu) spot prices over the same months.
Benchmark prices before quality and location differentials, transport, taxes and costs; this is a county-level economic indicator, not the value of any mineral or royalty interest.
Source: Valor analysis of public oil and gas data. Statistics are published on this page; no bulk download is offered.
| Rank | Operator | Oil (BBL) | Gas (Mcf) | Wells |
|---|---|---|---|---|
| 1 | Marathon Oil Company | 23,408,967 | 18,909,429 | 4 |
| 2 | Murphy Exploration & Production Company | 16,062,491 | 43,661,182 | 36 |
| 3 | Ineos Usa Oil & Gas LLC | 15,633,138 | 21,657,781 | 113 |
| 4 | Eog Resources | 10,733,695 | 11,400,279 | 151 |
| 5 | Burlington Resources Oil & Gas Company | 6,710,153 | 11,104,510 | 5 |
| 6 | Verdun Oil & Gas | 1,546,110 | 3,366,204 | 48 |
| 7 | Crescent Energy Operating, LLC | 1,424,531 | 4,592,633 | 107 |
| 8 | Bpx Operating Company | 1,040,946 | 27,900,619 | 280 |
| 9 | Gulftex Energy Iii | 1,014,691 | 4,407,070 | 45 |
| 10 | Javelin Energy | 1,014,054 | 1,044,140 | 26 |
| 11 | Repsol Oil & Gas Canada | 651,495 | 3,049,620 | 53 |
| 12 | Rosewood Resources | 476,196 | 2,293,245 | 22 |
| 13 | Trinity Operating Usg | 438,298 | 641,758 | 50 |
| 14 | Castlerock Ef Operating LLC | 313,173 | 529,370 | 8 |
| 15 | Verdun Oil Ef Ii LLC | 278,655 | 380,451 | 4 |
| 17 | Caturus Energy, LLC | 181,685 | 13,967,079 | 50 |
| 18 | Tidal Petroleum | 179,900 | 556,374 | 4 |
| 19 | Wr Resources, LLC | 125,201 | 0 | 5 |
| 20 | Varas Energy Operating Company, LLC | 116,549 | 1,853,587 | 454 |
| 22 | Rickaway Energy | 85,733 | 33,173 | 5 |
| 23 | Xto Energy | 64,460 | 476,536 | 44 |
| 24 | Gtg Operating | 59,681 | 73,460 | 21 |
| 25 | Awp Operating Company | 34,301 | 1,105,482 | 14 |
| — | 2 other operators (fewer than 3 producing wells/leases each) | 285,484 | 636,748 | 2 |
The largest oil and gas operators in Mcmullen County by reported production are Marathon Oil Company, Murphy Exploration & Production Company, and Ineos Usa Oil & Gas LLC. In total, 25 operators reported 81,879,587 BBL of oil and 173,640,730 Mcf of gas across 1,551 wells and leases over the last six months. If you own minerals in Mcmullen County, these operators are your likely check-writers — Valor tracks production and royalties by tract so you know who owes you.
Start with the operator rankings on this page, then confirm the exact well and operator on your tract through the Mcmullen County records and your division orders. Valor's mineral management verifies which operators cover your Mcmullen County tracts and reconciles every royalty check to the right well.
Yes — 25 operators reported active production in Mcmullen County over the last six months, led by Marathon Oil Company. Activity shifts as operators drill, complete, and sell interests; Valor monitors production and permits so Mcmullen County owners can see changes near their tracts.
Operators pay Mcmullen County mineral owners a royalty on production, based on a decimal interest set out on a division order. Missed or suspended checks are common after a move, a death, or a title gap. Valor audits Mcmullen County royalty statements, recovers suspended funds, and manages the interest so owners are paid correctly.
Valor manages minerals for owners — confirming which of the operators above cover your tracts, auditing every royalty check, recovering suspended and unclaimed funds, and giving you one clear, tax-ready view of what you own in Mcmullen County. Valor manages minerals; it never buys them.
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Page last reviewed: July 2026. Rankings are refreshed monthly from Texas Railroad Commission filings.