Texas oil lease · RRC district 08 · Lease 43078
ProducingCOX
Cox is an oil lease in Martin County, Texas, operated by Rock Fish Operating LLC in the Spraberry (Trend Area) field. The Railroad Commission shows 591 bbl of oil in the 12 months through Jul 2026.
Oil lease dossier · 1 well
- Operator
- Rock Fish Operating LLC
- County
- Martin County
- RRC lease
- 08-43078
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Where it sits
This county
- Oil in Jul 2026
- 178 bbl
- Reporting to the state
- since Jan 2020
- Wells
- 1
- Data through
- Jul 2026
Production
Month by month, from the state record
Oil output over the last 12 months
591 bbl in the 12 months through Jul 2026, against 0 bbl in the 12 months before.
- Oil (bars, left axis)
- Last 12 months
SourceTexas Railroad Commission Production Data Query, oil lease 43078, district 08. Reported through Jul 2026. The state revises recent months.
Gas disposition
Where the gas went
No gas disposition reported for this lease
Operator history
Who has run this lease
The operator changed 4 times, most recently in Apr 2026
If your statements skip or shrink around a change, ask the new operator's owner relations department whether the month is in suspense.
- Rock Fish Operating LLC Apr 2026 to now
- Flat Top Operating, LLC Oct 2022 to Mar 2026
- Hexp Operating, LLC Mar 2021 to Sep 2022
- Bam Permian Operating, LLC Jun 2020 to Feb 2021
- Parsley Energy Operations, LLC Jan 2020 to May 2020
SourceTexas Railroad Commission Production Data Query, operator by month. Reported through Jul 2026.
Wells
1 well on this lease
| API number | Well no. | Status | Total depthft |
|---|---|---|---|
| 42-317-37687 | 1 | Active | – |
SourceTexas Railroad Commission Wellbore Query, district 08, lease 43078.
Who buys and gathers
Who moves and buys this lease's production
Oil
Bml, Inc. B gathers it.
100% of it, on the list since Apr 1, 2026
Companies that used to be listed: Bml, Inc. B (gathers it, until Apr 1, 2026); Redbud Energy Marketing LLC (gathers it, until Apr 1, 2026); Axis Energy Marketing, LLC (gathers it, until Sep 1, 2025); Axis Energy Marketing, LLC (gathers it, until May 1, 2023); Transoil Marketing, LLC (gathers it, until Apr 1, 2021); Lease Use Only (gathers it, until Jun 1, 2020).
SourceRailroad Commission of Texas, Form P-4 file, dated Sep 24, 2026 (source). A listed company is authorised to move or buy the production; the state does not say what it paid.
Unit and wells
169.19 acres on the newest permit
- Wells on the permits
- 11 not plugged
- Horizontal
- 0
- First completion
- Aug 14, 2012
- Latest permit
- Apr 16, 2012
| API number | Well no. | Permit issued | Completed | Acreson the permit |
|---|---|---|---|---|
| 42-317-37687 | 1 | Apr 16, 2012 | Aug 14, 2012 | 169.19 |
Estimator
Estimate your royalty for this lease
Estimator
What could your check be?
Your decimal interest is the small number on your division order that says what share of the whole lease (8/8ths) is yours. Type it in and we apply it to what the state says COX sold each month.
For example 0.00097656, or a fraction like 1/1024.
Dollars per barrel. Your statements show the gap your operator uses. Leave 0 to price oil at WTI.
Your estimate appears here
An estimate, not your check
Ledger
36 months, newest first
| Month | Oil producedbbl | Oil soldbbl | WTI$ per bbl | Henry Hub$ per MMBtu |
|---|---|---|---|---|
| Jul 2026Rock Fish | 178 | 183 | $80.46 | $2.89 |
| Jun 2026Rock Fish | 212 | 181 | $84.81 | $3.15 |
| May 2026Rock Fish | 198 | 187 | $102.13 | $2.94 |
| Apr 2026Rock Fish | 3 | 0 | $100.32 | $2.77 |
| Mar 2026Flat Top | 0 | 0 | $91.38 | $3.04 |
| Feb 2026Flat Top | 0 | 0 | $64.51 | $3.62 |
| Jan 2026Flat Top | 0 | 0 | $60.04 | $7.72 |
| Dec 2025Flat Top | 0 | 0 | $57.97 | $4.26 |
| Nov 2025Flat Top | 0 | 0 | $60.06 | $3.79 |
| Oct 2025Flat Top | 0 | 0 | $60.89 | $3.19 |
| Sep 2025Flat Top | 0 | 0 | $63.96 | $2.97 |
| Aug 2025Flat Top | 0 | 0 | $64.86 | $2.91 |
| Jul 2025Flat Top | 0 | 0 | $68.39 | $3.20 |
| Jun 2025Flat Top | 0 | 0 | $68.17 | $3.02 |
| May 2025Flat Top | 0 | 0 | $62.17 | $3.12 |
| Apr 2025Flat Top | 0 | 0 | $63.54 | $3.42 |
| Mar 2025Flat Top | 0 | 0 | $68.24 | $4.12 |
| Feb 2025Flat Top | 0 | 0 | $71.53 | $4.19 |
| Jan 2025Flat Top | 0 | 0 | $75.74 | $4.13 |
| Dec 2024Flat Top | 0 | 0 | $70.12 | $3.01 |
| Nov 2024Flat Top | 0 | 0 | $69.95 | $2.12 |
| Oct 2024Flat Top | 0 | 0 | $71.99 | $2.20 |
| Sep 2024Flat Top | 0 | 0 | $70.24 | $2.28 |
| Aug 2024Flat Top | 0 | 0 | $76.68 | $1.99 |
| Jul 2024Flat Top | 0 | 0 | $81.80 | $2.07 |
| Jun 2024Flat Top | 0 | 0 | $79.77 | $2.54 |
| May 2024Flat Top | 1 | 0 | $80.02 | $2.12 |
| Apr 2024Flat Top | 1 | 0 | $85.35 | $1.60 |
| Mar 2024Flat Top | 1 | 162 | $81.28 | $1.49 |
| Feb 2024Flat Top | 134 | 164 | $77.25 | $1.72 |
| Jan 2024Flat Top | 332 | 335 | $74.15 | $3.18 |
| Dec 2023Flat Top | 57 | 0 | $71.90 | $2.52 |
| Nov 2023Flat Top | 144 | 166 | $77.69 | $2.71 |
| Oct 2023Flat Top | 144 | 177 | $85.64 | $2.98 |
| Sep 2023Flat Top | 138 | 0 | $89.43 | $2.64 |
| Aug 2023Flat Top | 61 | 0 | $81.39 | $2.58 |
No report filed More than 3% of gas flared
SourceVolumes: Texas Railroad Commission Production Data Query, reported through Jul 2026. Prices: EIA WTI Cushing spot and Henry Hub spot, monthly, through Aug 2026. “Gas sold” is gas sent to a transmission line (code 2) or a plant (code 3).
Check your statements
Do your checks match this lease?
Upload your statements for COX. We compare volumes, prices, deductions and timing with the state record and give you the exact question to ask Rock Fish Operating LLC.
- A month that was never paid
- Your share of the barrels and mcf
- The price against WTI and Henry Hub
- Fees taken on gas
- Late payment interest
Around this lease
Walk the neighborhood
This lease belongs to
Rock Fish Operating LLC in Martin County
- RUTH 47
4,637 bbl last 12 months
Spraberry (Trend Area) field
- FEE 'BP'
4,094,243 bbl last 12 months
- YELLOW BELLY
3,313,031 bbl last 12 months
- SOUTH CURTIS RANCH
2,812,875 bbl last 12 months
- FEE "BM"
3,039,124 bbl last 12 months
- SILVER BULLET
2,685,879 bbl last 12 months
Leases within 10 km
Found by the location of their wells.
- DOOLITTLE 11
40,305 bbl last 12 months · 0.1 km away
- DOOLITTLE 10
17,468 bbl last 12 months · 0.1 km away
- DOOLITTLE 9
11,569 bbl last 12 months · 0.1 km away
- DOOLITTLE 4
14,787 bbl last 12 months · 0.3 km away
- IDARADO I 28
23,218 bbl last 12 months · 0.3 km away
Drilling permits within 10 km
HALSEY 4-45 A #1WB
new drill · horizontal · Diamondback E&P LLC · Martin County · 6.2 km away
Permit 0918127 · Sep 8, 2026
HALSEY 4-45 C #1JM
new drill · horizontal · Diamondback E&P LLC · Martin County · 6.2 km away
Permit 0918130 · Sep 4, 2026
HALSEY 4-45 D #1WA
new drill · horizontal · Diamondback E&P LLC · Martin County · 6.2 km away
Permit 0918131 · Sep 4, 2026
HALSEY 4-45 E #1LS
new drill · horizontal · Diamondback E&P LLC · Martin County · 6.2 km away
Permit 0918135 · Sep 4, 2026
HALSEY 4-45 B #2LS
new drill · horizontal · Diamondback E&P LLC · Martin County · 6.2 km away
Permit 0918128 · Sep 4, 2026
How to read this page
Questions owners ask
What is a decimal interest?
It is your share of the whole lease, written as a decimal. A 1/4 royalty on 5 net acres in a 1,280-acre unit is 1/4 × 5 ÷ 1,280 = 0.00097656. Your division order states yours.
How do I use this page to check a royalty check?
Take the “Oil sold” volume for the month the check covers and multiply it by your decimal. The answer should match the barrels on your statement. If it does not, upload the statement and we will show where the two differ.
Why is the newest month Jul 2026?
The Railroad Commission publishes production two to three months after the fact and revises recent months. We re-pull the latest three months on every update.
Does this page show what my check should be?
No. It shows what the state recorded. Prices, fees and taxes depend on your lease and on what your operator gets for the oil and gas. The estimator gives a ceiling to compare against.
Sources and method
Where these numbers come from
- Production and disposition by month: Texas Railroad Commission Production Data Query, oil lease 43078, district 08, reported through Jul 2026.
- Wells: Texas Railroad Commission Wellbore Query.
- Prices: U.S. Energy Information Administration, WTI Cushing spot and Henry Hub spot, monthly.
- Page updated Sep 28, 2026.
We show the state’s numbers as filed. Where the state has no report for a month, we say so instead of guessing.