Texas operator · P-5 100156
Castlerock Ef Operating LLC
Facts and their sources. No rating, no opinion.
The record
What the state's files show about Castlerock Ef Operating LLC
Railroad Commission record
Who the state lists
The Railroad Commission lists this company as an operator: it reports wells and leases in Texas.
- Name on file
- CASTLEROCK EF OPERATING LLC
- Operator number (P-5)
- 100156
- P-5 status
- Active (extension)
- Organization type
- Limited liability company (code not in the RRC's 2014 layout; inferred from the names)
- Location
- San Antonio, TX
- Mailing city
- San Antonio, TX
- Activities filed
- Oil Operator
- Last P-5 received
- January 28, 2026
- Record built
- February 2, 2022
- Refiling required
- Yes
Source: Railroad Commission of Texas, P-5 Organization Report data set, as of September 22, 2026.
Owner relations
How to reach Castlerock Ef Operating LLC as an owner
Not checked yet
We have not checked Castlerock Ef Operating LLC’s owner-relations desk yet. Here is how owners usually find it:
- Look at a recent check stub or statement. The phone number and address printed on it usually reach the owner relations department.
- Search the company’s own website for “owner relations” or “royalty owners”. Larger operators have a page and an online owner portal.
- The Railroad Commission file above has the company’s mailing address. A letter sent there reaches the company, though not always the right desk.
- Put your owner number and the property name or number on every letter and call.
Comptroller and Secretary of State
The business entity on file
- Legal name
- CASTLEROCK EF OPERATING LLC
- Taxpayer number
- 32082363832
- Entity type
- Foreign limited liability company
- Secretary of State file number
- 0804360059
- Secretary of State status
- Active (December 16, 2021)
- Right to transact business in Texas
- Active
- Formed
- December 16, 2021
- Formed in
- Outside Texas (the file does not say where)
- Mailing city
- San Antonio, TX
Source: Texas Comptroller, franchise tax permit holder file (data.texas.gov), as of September 26, 2026.
Look it up yourself: Secretary of State business filings (search for file number 0804360059), Comptroller account status.
Production
What the state's reports show
- Oil, last 12 months
- 506,492 barrels
- Down 55.1% from the 12 months before
- Gas, last 12 months
- 814,198 mcf
- Down 45.5% from the 12 months before
Oil reported each month, in barrels
- Jul 202623,249
- Jun 202618,586
- May 202635,489
- Apr 202640,886
- Mar 202644,769
- Feb 202639,944
- Jan 202646,075
- Dec 202547,643
- Nov 202547,994
- Oct 202552,932
- Sep 202551,171
- Aug 202557,754
Source: Railroad Commission of Texas, production data query, as of July 1, 2026.
Drilling permits
Permits filed with the state
8 drilling permits in the last three years: 8 in 2024. A permit is permission to drill. It is not a well.
| Issued | Lease, county and type |
|---|---|
| 2024-09-25 | Y-BAR 160H UNIT #160HMcMullen County · Horizontal |
| 2024-09-25 | Y-BAR #150HMcMullen County · Horizontal |
| 2024-03-20 | Y-BAR A #180HMcMullen County · Horizontal |
| 2024-03-20 | Y-BAR 170H UNIT #170HMcMullen County · Horizontal |
| 2024-03-20 | Y-BAR #140HLa Salle County · Horizontal |
| 2024-03-20 | Y-BAR #130HLa Salle County · Horizontal |
| 2024-03-20 | Y-BAR #120HLa Salle County · Horizontal |
| 2024-03-20 | Y-BAR #110HLa Salle County · Horizontal |
Source: Railroad Commission of Texas, drilling permit records.
Leases
Leases this company operates
17 leases on the state record, 13 with production in the last twelve months. The largest by production:
- CRX YbarMcMullen County · 99,662 bbl of oil
- Y-BarMcMullen County · 93,384 bbl of oil
- Y-Bar 170H UnitMcMullen County · 61,358 bbl of oil
- CRX Ybar ALa Salle County · 42,052 bbl of oil
- CRX Ybar DLa Salle County · 37,250 bbl of oil
- CRX Ybar CLa Salle County · 33,636 bbl of oil
- Y-Bar 160H UnitMcMullen County · 32,345 bbl of oil
- CRX Ybar BLa Salle County · 31,871 bbl of oil
- CRX Ybar EMcMullen County · 26,724 bbl of oil
- Y-Bar AMcMullen County · 27,464 bbl of oil
- Y-Bar Unit AMcMullen County · 12,090 bbl of oil
- Y-Bar Unit CMcMullen County · 5,266 bbl of oil
- Y-Bar WestLa Salle County · 3,282 bbl of oil
- Y-Bar West Unit ALa Salle County · 108 bbl of oil
- Y-Bar East Unit AMcMullen County · nothing reported in 12 months
- Y Bar MCMMcMullen County · nothing reported in 12 months
- Y-Bar EastMcMullen County · nothing reported in 12 months
Operator changes
Leases this company took over or handed over
8 taken over and 0 handed over since the state's history begins; 0 and 0 in the last twelve months. The month is the first month the change shows in production reports.
- Took over Y-Bar East, McMullen CountyAug 2022 · from Murphy Expl. & Prod. Co. - USA
- Took over Y-Bar West Unit A, La Salle CountyAug 2022 · from Murphy Expl. & Prod. Co. - USA
- Took over Y-Bar Unit A, McMullen CountyAug 2022 · from Murphy Expl. & Prod. Co. - USA
- Took over Y-Bar, McMullen CountyAug 2022 · from Murphy Expl. & Prod. Co. - USA
- Took over Y-Bar Unit C, McMullen CountyAug 2022 · from Murphy Expl. & Prod. Co. - USA
- Took over Y-Bar West, La Salle CountyAug 2022 · from Murphy Expl. & Prod. Co. - USA
- Took over Y-Bar East Unit A, McMullen CountyAug 2022 · from Murphy Expl. & Prod. Co. - USA
- Took over Y Bar MCM, McMullen CountyJan 2022 · from Murphy Expl. & Prod. Co. - USA
Use it
Follow this company, or check a paper it sent you
New permits and production
One email a week when Castlerock Ef Operating LLC files a drilling permit, completes a well or reports first production. Free with an account.
A paper from this company
A division order, a lease, a buyout offer or a letter: upload it and we say what it is, what it asks and which terms deserve a question.
FAQ
Questions people ask
Who is Castlerock Ef Operating LLC?
The Railroad Commission lists Castlerock Ef Operating LLC as operator number 100156, P-5 active, in San Antonio, TX. Its leases reported 506,492 barrels of oil and 814,198 mcf of gas in the last twelve months.
Is Castlerock Ef Operating LLC a registered business in Texas?
The Comptroller's franchise tax file lists a business entity that matches the company: CASTLEROCK EF OPERATING LLC, a foreign limited liability company, Secretary of State status Active, right to transact business in Texas: Active. Confirm it in the Secretary of State's business search.
How much oil and gas did Castlerock Ef Operating LLC report?
In the last twelve months the leases Castlerock Ef Operating LLC operates reported 506,492 barrels of oil and 814,198 mcf of gas to the Railroad Commission, through July 1, 2026. It has 17 leases on the state record, 13 with production in that time.
How many drilling permits has Castlerock Ef Operating LLC filed?
8 drilling permits in the last three years in the permit feed this site reads. A permit is permission to drill, not a well: many are never drilled.
I got a letter or an offer from Castlerock Ef Operating LLC: what should I do?
Do not sign or call yet. Keep every page and the envelope, compare the paper with your deed, lease and last statements, and answer in writing. You can upload the letter to have it read: it says what kind of paper it is, what it asks, and which terms deserve a question, quoting the words they come from.
Where does this page's information come from, and how current is it?
The record is the Railroad Commission's P-5 Organization Report file, dated September 22, 2026. The entity is the Comptroller's franchise tax file. Production, permits and leases are the Commission's own reports. The page shows no rating and no opinion.
Related
Keep going
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- HelpI got a letter from an oil companyUpload it. We say what it is, what it asks and what to look at.
- ToolTexas well watchPermit, completion, first production and when the first check is due.
- Texas dataTexas operator changesWho took over whose leases in the last 24 months.
- CheckCheck my statementUpload a stub. Every month against the state record.
- HelpTexas division ordersWhat you may sign, what you may refuse, what to check.
Sources
Primary sources, opened on 29 September 2026. Statute text is the current version on statutes.capitol.texas.gov.