Texas operator and buyer · P-5 525398
Marathon Oil Ef LLC
Facts and their sources. No rating, no opinion.
The record
What the state's files show about Marathon Oil Ef LLC
Railroad Commission record
Who the state lists
The Railroad Commission lists this company as an operator, and the state's records list it as a purchaser or gatherer.
- Name on file
- MARATHON OIL EF LLC
- Operator number (P-5)
- 525398
- P-5 status
- Active
- Organization type
- Limited liability company (code not in the RRC's 2014 layout; inferred from the names)
- Location
- Houston, TX
- Mailing city
- Houston, TX
- Activities filed
- Casinghead Gas Gatherer, Casinghead Gas Purchaser, Gas Purchaser, Condensate Gatherer, Gas Gatherer, Oil Gatherer, Gas Operator, Oil Operator
- Last P-5 received
- September 26, 2025
- Record built
- November 2, 2011
- Refiling required
- Yes
Source: Railroad Commission of Texas, P-5 Organization Report data set, as of September 22, 2026.
Owner relations
How to reach Marathon Oil Ef LLC as an owner
Not checked yet
We have not checked Marathon Oil Ef 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
- MARATHON OIL EF LLC
- Taxpayer number
- 32042039316
- Entity type
- Foreign limited liability company
- Secretary of State file number
- 0801281551
- Secretary of State status
- Active (June 14, 2010)
- Right to transact business in Texas
- Active
- Formed
- June 14, 2010
- Formed in
- Outside Texas (the file does not say where)
- Mailing city
- Houston, 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 0801281551), Comptroller account status.
Production
What the state's reports show
- Oil, last 12 months
- 29,216,060 barrels
- Down 32.1% from the 12 months before
- Gas, last 12 months
- 104,473,064 mcf
- Down 34.1% from the 12 months before
Oil reported each month, in barrels
- Jul 20262,070,943
- Jun 20262,003,455
- May 20262,120,124
- Apr 20262,239,112
- Mar 20262,331,021
- Feb 20262,104,501
- Jan 20262,460,188
- Dec 20252,461,097
- Nov 20252,575,748
- Oct 20252,885,695
- Sep 20252,870,685
- Aug 20253,093,491
Source: Railroad Commission of Texas, production data query, as of July 1, 2026.
Drilling permits
Permits filed with the state
228 drilling permits in the last three years: 10 in 2023, 140 in 2024, 27 in 2025, 51 in 2026. A permit is permission to drill. It is not a well.
| Issued | Lease, county and type |
|---|---|
| 2026-10-01 | HAUS-JAU-CHRIS SA B #1Karnes County · Horizontal |
| 2026-10-01 | HAUS QUAD SA A #1Karnes County · Horizontal |
| 2026-09-21 | WHITSETT-TAYLOR-MASS SA D #1Live Oak County · Horizontal |
| 2026-09-21 | WHITSETT-TAYLOR-MASS SA C #1Live Oak County · Horizontal |
| 2026-09-21 | WHITSETT-TAYLOR-MASS SA B #1Live Oak County · Horizontal |
| 2026-09-21 | WHITSETT-TAYLOR-MASS SA A #1Live Oak County · Horizontal |
| 2026-09-10 | HAUS-CHRIS SA D #1Karnes County · Horizontal |
| 2026-09-10 | HAUS-CHRIS SA C #1Karnes County · Horizontal |
| 2026-07-21 | BARNHART (EF)-HFS SA10 #140HGonzales County · Horizontal |
| 2026-07-16 | BARNHART (EF) #206HGonzales County · Horizontal |
Source: Railroad Commission of Texas, drilling permit records.
Leases
Leases this company operates
1,980 leases on the state record, 1,561 with production in the last twelve months. The largest by production:
- Middle McCowenAtascosa County · 3,408,305 bbl of oil
- Barnhart (Ef)Gonzales County · 994,496 bbl of oil
- Ridley 01Karnes County · 454,287 bbl of oil
- MCS Foundation UnitAtascosa County · 384,325 bbl of oil
- Davis-Mensik Sa1Karnes County · 269,276 bbl of oil
- Reynolds Gas Unit 2Karnes County · 286,429 bbl of oil
- Davis-Alexander Sa1Karnes County · 245,569 bbl of oil
- Elizondo 01Karnes County · 210,015 bbl of oil
- Elizondo 01Karnes County · 192,972 bbl of oil
- Elizondo 01Karnes County · 192,728 bbl of oil
- Griffin-Krueger Sa4Atascosa County · 182,123 bbl of oil
- Hierholzer Retzloff-McMahon Sa1Atascosa County · 174,826 bbl of oil
- Guajillo EastAtascosa County · 171,228 bbl of oil
- R May A-May Girls Chapman Sa2Atascosa County · 168,926 bbl of oil
- Hierholzer Retzloff-McMahon Sa3Atascosa County · 164,866 bbl of oil
- R May A-Schroeder Chapman Sa1Atascosa County · 157,727 bbl of oil
- Hierholzer Retzloff-McMahon Sa2Atascosa County · 149,595 bbl of oil
- Griffin-Krueger Sa3Atascosa County · 144,957 bbl of oil
- Edward Roeder-James Gano Sa1De Witt County · 114,945 bbl of oil
- Griffin-Krueger Sa2Atascosa County · 142,034 bbl of oil
- Patino-Franke Unit Sa1Karnes County · 99,653 bbl of oil
- Edward Roeder-Migura A Sa1De Witt County · 117,037 bbl of oil
- MCS Foundation-Tom Family Usw AAtascosa County · 136,890 bbl of oil
- Koopman 01-L 01-S 01-A 01 Sa2De Witt County · 92,222 bbl of oil
- Tom-Smith Unit CAtascosa County · 128,774 bbl of oil
Operator changes
Leases this company took over or handed over
635 taken over and 3 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.
- Handed over Turk-Williams Sa A, Gonzales CountySep 2025 · to Ensign Natural Resources II LLC
- Took over Harold Gohmert 01 - Hay 01 B, De Witt CountyMar 2023 · from Ensign Operating LLC
- Took over Warling 01, De Witt CountyMar 2023 · from Ensign Operating LLC
- Took over Sinor Ranch 02, Live Oak CountyMar 2023 · from Ensign Operating LLC
- Took over Warner 01, Karnes CountyMar 2023 · from Ensign Operating LLC
- Took over Warling 01, De Witt CountyMar 2023 · from Ensign Operating LLC
- Took over Schendel 02, Karnes CountyMar 2023 · from Ensign Operating LLC
- Took over Haveman 01, Karnes CountyMar 2023 · from Ensign Operating LLC
- Took over Davis 01, Karnes CountyMar 2023 · from Ensign Operating LLC
- Took over Douglas 01, Karnes CountyMar 2023 · from Ensign Operating LLC
- Took over Dworaczyk 01, De Witt CountyMar 2023 · from Ensign Operating LLC
- Took over Myra Kelley 06, De Witt CountyMar 2023 · from Ensign Operating LLC
Public company
Filings that name this operator
- Marathon Oil Corporation (MRO) lists this company as a subsidiary in its filing with the SEC. Read the filing
- ConocoPhillips (COP) says in its filing with the SEC that it acquired this company. Read the filing
Use it
Follow this company, or check a paper it sent you
New permits and production
One email a week when Marathon Oil Ef 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 Marathon Oil Ef LLC?
The Railroad Commission lists Marathon Oil Ef LLC as operator number 525398, P-5 active, in Houston, TX. Its leases reported 29,216,060 barrels of oil and 104,473,064 mcf of gas in the last twelve months. The state's records also list it as a purchaser or gatherer.
Is Marathon Oil Ef LLC a registered business in Texas?
The Comptroller's franchise tax file lists a business entity that matches the company: MARATHON OIL EF 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 Marathon Oil Ef LLC report?
In the last twelve months the leases Marathon Oil Ef LLC operates reported 29,216,060 barrels of oil and 104,473,064 mcf of gas to the Railroad Commission, through July 1, 2026. It has 1,980 leases on the state record, 1,561 with production in that time.
How many drilling permits has Marathon Oil Ef LLC filed?
228 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 Marathon Oil Ef 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
- Texas dataTexas oil and gas companiesOperators and buyers: the state's record, permits, leases, production.
- 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.