Skip to content
Royalty Clerk

Texas oil lease

Producing

COX "12A"

Cox "12A" is an oil lease in Martin County, Texas, operated by Diamondback E&P LLC in the Spraberry (Trend Area) field.

7 wells

1,116bbl oil, last 12 months−12% vs prior year
Operator
Diamondback E&P LLC
County
Martin County
Field
Spraberry (Trend Area)
RRC lease
08-41447

Is your check right?

Check my statement

Where it sits

This county

Martin CountyMartinGainesAndrewsHowardDawsonBordenMartin County
Martin County
Gas, last 12 months
5,278 mcf
Oil in Jul 2026
54 bbl

Production by month

Oil output fell 12% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 12% over the last 12 monthsMonthly oil production and gas for COX "12A", Aug 2023 to Jul 2026. Oil output fell 12% over the last 12 months. 1,116 bbl in the 12 months through Jul 2026, against 1,271 bbl in the 12 months before.Last 12 months: 1,116 bblbbl per monthmcf per month002505005001,0007501,5001,0002,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 12% over the last 12 monthsMonthly oil production and gas for COX "12A", Aug 2023 to Jul 2026. Oil output fell 12% over the last 12 months. 1,116 bbl in the 12 months through Jul 2026, against 1,271 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month002505005001,0007501,5001,0002,000Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

All of the gas went to a transmission line in the last 12 months

Flaring peaked at 100.0% of the gas in Nov 2024.

  • Processing plant (3)
  • Transmission line (2)
  • Flared (4)
All of the gas went to a transmission line in the last 12 monthsShare of COX "12A" gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a transmission line in the last 12 months. Flaring peaked at 100.0% of the gas in Nov 2024.Share of the lease’s gas by disposition code, per month0%50%100%Flared 100.0%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
All of the gas went to a transmission line in the last 12 monthsShare of COX "12A" gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a transmission line in the last 12 months. Flaring peaked at 100.0% of the gas in Nov 2024.Share of gas by disposition code0%50%100%Flared 100.0%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Who has run this lease

The operator changed once, most recently in Jan 2025

Operators of this lease over timeEndeavor Energy Resources L.P., Jan 2020 to Dec 2024; Diamondback E&P LLC, Jan 2025 to Jul 20262020202120222023202420252026Changed Jan 2025Endeavor Energy Resources L.P.Jan 2020 to Dec 2024Diamondback E&P LLCJan 2025 to now
Operators of this lease over timeEndeavor Energy Resources L.P., Jan 2020 to Dec 2024; Diamondback E&P LLC, Jan 2025 to Jul 20262020202120222023202420252026Changed Jan 2025Endeavor Energy Resources L.P.Jan 2020 to Dec 2024Diamondback E&P LLCJan 2025 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

7 wells on this lease

Wells on COX "12A"
API numberWell no.Status
42-317-342401AActive
42-317-366351Active
42-317-373562Shut-in
42-317-380863Active
42-317-386024Shut-in
42-317-390195Shut-in
42-317-396296Shut-in

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Explore Logistics LLCOilGathers100Apr 1, 2025–
Et Gathering & Processing LLCCasinghead gasBuys100Mar 1, 2026–
Energy Transfer CompanyCasinghead gasGathers100Apr 1, 2025–
Etc Gas Processing, LLCCasinghead gasBuys100Apr 1, 2025Mar 1, 2026
Wtg Gas Processing, L.p.Casinghead gasGathers100Jun 15, 2011Apr 1, 2025
Wtg Gas Processing, L.p.Casinghead gasBuys100Jun 15, 2011Apr 1, 2025
Oasis Transp & Marketing Corp.OilGathers100Jun 15, 2011Apr 1, 2025

SourceRailroad Commission Form P-4 file, Sep 24, 2026 (source).

Who buys my oilOil price check

80 acres on the newest permit

The wells on this lease state different acreage

The permits state between 80 and 596 acres.

7 wells are listed on this lease

Permits for Cox "12A"
API numberWell no.Acreson the permit
42-317-342401A80
42-317-396296596
42-317-390195596
42-317-386024596
42-317-380863596
42-317-373562596
42-317-366351560

SourceRailroad Commission drilling permits, Sep 26, 2026 (source 1, source 2).

Unit decimal checker

What Diamondback Energy, Inc. told investors it received

Diamondback E&P LLC is linked to Diamondback Energy, Inc. (FANG).
Realized prices reported by Diamondback Energy, Inc.
QuarterOil$ per bblFiling
Q2 2026$96.82SEC filing
Q1 2026$73.47SEC filing
Q4 2025$58.00SEC filing
Q3 2025$64.60SEC filing
Q2 2025$63.23SEC filing
Q1 2025$70.95SEC filing

SourceDiamondback Energy, Inc. quarterly reports, SEC EDGAR, company-wide averages before hedging.

Estimate your royalty

36 months, newest first

Ledger for COX "12A"
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 2026Diamondback E&P5402382380$80.46$2.89
Jun 2026Diamondback E&P451692452450$84.81$3.15
May 2026Diamondback E&P8102752750$102.13$2.94
Apr 2026Diamondback E&P771823763760$100.32$2.77
Mar 2026Diamondback E&P8007367360$91.38$3.04
Feb 2026Diamondback E&P1001796086080$64.51$3.62
Jan 2026Diamondback E&P11218698690$60.04$7.72
Dec 2025Diamondback E&P911787887880$57.97$4.26
Nov 2025Diamondback E&P9406106100$60.06$3.79
Oct 2025Diamondback E&P971815175170$60.89$3.19
Sep 2025Diamondback E&P14418316160$63.96$2.97
Aug 2025Diamondback E&P141175000$64.86$2.91
Jul 2025Diamondback E&P19818449490$68.39$3.20
Jun 2025Diamondback E&P152121541540$68.17$3.02
May 2025Diamondback E&P1993507397390$62.17$3.12
Apr 2025Diamondback E&P3313617147140$63.54$3.42
Mar 2025Diamondback E&P10501971970$68.24$4.12
Feb 2025Diamondback E&P0056560$71.53$4.19
Jan 2025Diamondback E&P0548480$75.74$4.13
Dec 2024Endeavor Energy2024240$70.12$3.01
Nov 2024Endeavor Energy560101$69.95$2.12
Oct 2024Endeavor Energy36015150$71.99$2.20
Sep 2024Endeavor Energy00000$70.24$2.28
Aug 2024Endeavor Energy1923364834830$76.68$1.99
Jul 2024Endeavor Energy2993583523520$81.80$2.07
Jun 2024Endeavor Energy6836993003000$79.77$2.54
May 2024Endeavor Energy5064981511510$80.02$2.12
Apr 2024Endeavor Energy3863554934930$85.35$1.60
Mar 2024Endeavor Energy3873548458450$81.28$1.49
Feb 2024Endeavor Energy6016957737730$77.25$1.72
Jan 2024Endeavor Energy55351764640$74.15$3.18
Dec 2023Endeavor Energy4855061241240$71.90$2.52
Nov 2023Endeavor Energy3213653133130$77.69$2.71
Oct 2023Endeavor Energy4703531,1261,1260$85.64$2.98
Sep 2023Endeavor Energy6507101,7471,7470$89.43$2.64
Aug 2023Endeavor Energy8269991,1461,1460$81.39$2.58

Flared above 3%

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Sep 28, 2026.

How to check your stub against this lease

Do your checks match this lease?

Check my statement

Nearby

This lease belongs to

OperatorDiamondback E&P LLCFieldSpraberry (Trend Area)CountyMartin County

Diamondback E&P LLC in Martin County

All Diamondback E&P LLC leases →

Spraberry (Trend Area) field

All leases in this field →

Leases within 10 km

Drilling permits within 10 km