| 18401 | McEuen, Billy Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Dec 2016 |
| 18402 | McEver Oil Company Inc. | Austin, TX 78789 | Oil & Gas Operator | Mar 2008 |
| 18403 | MCF Co. | | Oil & Gas Operator | Dec 2011 |
| 18404 | McFadden Energy TX, LLC | Lakewood, NY 14750 | Oil Operator | Nov 2024 |
| 18405 | McFadden Oil Co. | | Oil Operator | Jul 2024 |
| 18406 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Nov 2024 |
| 18407 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 18408 | McFerran Operating LLC | Seminole, OK 74868-6202 | Oil & Gas Operator | Sep 2024 |
| 18409 | MCG Oil & Gas Operating, LLC | Archer City, TX 76351 | Oil & Gas Operator | Sep 2023 |
| 18410 | McGee Drilling Corporation | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 18411 | McGee, Tom Corporation | Booker, TX 79005 | Oil & Gas Operator | Aug 2024 |
| 18412 | McGehee, George T. Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 1997 |
| 18413 | McGhee Exploration And Prod. Co. | Houston, TX 77019 | Oil & Gas Operator | Feb 2003 |
| 18414 | McGinley Jr, John R | | Gas Operator | Nov 1998 |
| 18415 | McGinley P A | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1996 |
| 18416 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jul 2024 |
| 18417 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 18418 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 18419 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 18420 | McGoldrick & Watson | | Oil & Gas Operator | Jul 1987 |
| 18421 | McGoldrick & Watson - Alagood | | Oil Operator | Oct 1995 |
| 18422 | McGoldrick & Watson DRLG., Co. | | Oil & Gas Operator | Jul 1987 |
| 18423 | McGoldrick & Watson, Et Al | | Oil Operator | Jul 1987 |
| 18424 | McGoldrick & Watson-Walker | | Oil Operator | Jul 1987 |
| 18425 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 18426 | McGonagill J W | MT Gilead, OH 43338 | Oil Operator | Dec 1984 |
| 18427 | McGonigal Dan L | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 18428 | McGonigal Donald T | Tulsa, OK 74114-2145 | Oil & Gas Operator | Jul 2004 |
| 18429 | McGonigal Ted W | Norman, OK 73072-3037 | Oil & Gas Operator | Sep 2024 |
| 18430 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 18431 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Nov 2024 |
| 18432 | McGowen Resources Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 18433 | McGown Drilling | | Oil Operator | Apr 1993 |
| 18434 | McGown Drilling, Inc. | Mound City, KS 66056 | Oil Operator | Jul 2024 |
| 18435 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | Jul 2024 |
| 18436 | McGriff Craig Exploration Inc | Oklahoma City, OK 73172-0364 | Oil & Gas Operator | Mar 2023 |
| 18437 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Nov 2024 |
| 18438 | McGuire Brothers | Phoenix, AZ 85045 | Oil & Gas Operator | Nov 2024 |
| 18439 | McGuire John C | Gillette, WY 82717 | Oil & Gas Operator | Oct 2005 |
| 18440 | McGuire Tom Oil Company | Depew, OK 74028 | Oil Operator | Apr 2011 |
| 18441 | McIlhenny-Powell Operating Co | | Gas Operator | Aug 1983 |
| 18442 | McIlvain Oil LLC | Madison, KS 66860 | Oil Operator | Dec 2017 |
| 18443 | McIntosh Oil & Gas, Inc. | Coalton, WV 26257 | Oil & Gas Operator | Dec 2021 |
| 18444 | McIntyre M L | Oklahoma City, OK 73154-0523 | Oil & Gas Operator | Jul 1996 |
| 18445 | McIntyre Oil Company | | Oil & Gas Operator | Jan 1992 |
| 18446 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Nov 2024 |
| 18447 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 18448 | McKay Oil | Portales, NM 88130 | Oil & Gas Operator | Apr 1996 |
| 18449 | McKay Oil & Gas LLC | Albuquerque, NM 87191 | Gas Operator | Mar 2020 |
| 18450 | McKay Oil Company | Perry, OK 73077 | Oil Operator | Nov 2008 |
| 18451 | McKay Oil Corp | Roswell, NM 88202 | Oil & Gas Operator | Aug 2017 |
| 18452 | McKay Operating LLC | Lubbock, TX 79416 | Oil & Gas Operator | Oct 2023 |
| 18453 | McKean Bros. | | Oil & Gas Operator | Dec 1997 |
| 18454 | McKee Don Drill Co Inc | Newark, OH 43058 | Oil & Gas Operator | Dec 2012 |
| 18455 | McKee Energy Company Inc | Pawhuska, OK 74056 | Oil & Gas Operator | Apr 2011 |
| 18456 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 18457 | McKeever, Tyra, Swenson Venture | Stamford, TX 79553 | Oil & Gas Operator | Apr 1996 |
| 18458 | McKellpee Energy Corp. | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 18459 | McKelvy A D Oil | | Gas Operator | Feb 1995 |
| 18460 | McKenna Oil Co | Kane, PA 16735-9711 | Oil & Gas Operator | Dec 2004 |
| 18461 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 18462 | McKenzie Management Inc. | | Oil & Gas Operator | Aug 1989 |
| 18463 | McKenzie Methane | Houston, TX BAD ADDR | Gas Operator | Apr 1994 |
| 18464 | McKenzie Operating Company, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 18465 | McKenzie Petroleum Company | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 18466 | McKenzie Production Company | Houston, TX 77063 | Oil & Gas Operator | May 1995 |
| 18467 | McKinney Kenneth R | Okmulgee, OK 74447-6932 | Oil Operator | Aug 2000 |
| 18468 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 18469 | McKinney, Jason G. | | Oil Operator | Dec 2021 |
| 18470 | McKinney, M. H. | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 18471 | McKnight, C. L. | McLeod, TX 75565 | Oil & Gas Operator | Nov 2024 |
| 18472 | McKnight, C. L. Oil Co. LLP | McLeod, TX 75565 | Oil & Gas Operator | Nov 2024 |
| 18473 | McKnight, J. C. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2019 |
| 18474 | MCL 1 Oil & Gas Wyoming LLC | Minneapolis, MN 55402 | Oil & Gas Operator | Jul 2018 |
| 18475 | McLain Exploration, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2008 |
| 18476 | McLain J. Forman | | Oil & Gas Operator | Mar 1988 |
| 18477 | McLane Trust* Dixie | | Gas Operator | Aug 2024 |
| 18478 | McLaurin Oil Co. | | Oil Operator | Jul 2024 |
| 18479 | McLelland Engineering & MGMT. | Houston, TX 77042 | Oil & Gas Operator | Mar 1999 |
| 18480 | McLemore, Laurence | Iowa Park, TX 76367 | Oil & Gas Operator | Nov 2024 |
| 18481 | McLennan Family Properties LLP | | Oil & Gas Operator | Dec 2021 |
| 18482 | McLeod Gas Gath & Proc Co. L.L.C. | | Oil Operator | Jul 2012 |
| 18483 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 18484 | McLester Oil & G | | Oil & Gas Operator | Jun 1992 |
| 18485 | McLish, Holmes P | Denver, CO 80202 | Oil & Gas Operator | Dec 1983 |
| 18486 | McLouth Operating Company, Inc. | Kansas City, MO 64106 | Oil Operator | Aug 1999 |
| 18487 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 18488 | MCM Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2024 |
| 18489 | McMahon Operating Co., L.C. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2004 |
| 18490 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 18491 | McMahon-Bullington LP | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2009 |
| 18492 | McMillan, David | FT. Worth, TX 76107 | Oil Operator | Aug 2001 |
| 18493 | McMillan, L.L.C. | Sedan, KS 67361 | Oil Operator | Dec 2019 |
| 18494 | McMillen, Clay Eugene (Gene) | Chanute, KS 66720 | Oil Operator | Aug 1997 |
| 18495 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | Aug 2024 |
| 18496 | McMinn Operating Company, Inc. | Hempstead, TX 77445 | Oil & Gas Operator | Nov 2024 |
| 18497 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 18498 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 18499 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 18500 | McMoran-Transco | | Oil & Gas Operator | Aug 1979 |