| 18501 | Merrico Resource | | Oil Operator | Dec 1996 |
| 18502 | Merrico Resources | | Oil Operator | Mar 1992 |
| 18503 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 18504 | Merrill Natural Res Inc | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 1985 |
| 18505 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 18506 | Merrill, Brian G. | Depew, NY 14043 | Gas Operator | Dec 2024 |
| 18507 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 18508 | Merrion & Bayless | Farmington, NM 87401 | Oil & Gas Operator | May 1982 |
| 18509 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Mar 2026 |
| 18510 | Merritt Oil Comp | | Oil Operator | Jan 1990 |
| 18511 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Jun 2026 |
| 18512 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |
| 18513 | Mert Development Inc | | Oil & Gas Operator | Dec 2021 |
| 18514 | Merta, Mike | Alice, TX 78333 | Oil & Gas Operator | Aug 2005 |
| 18515 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 18516 | Mervin Troyer | Union City, PA 16438-8510 | Gas Operator | Dec 2008 |
| 18517 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 18518 | Merzbacher, George F. Jr. | Robstown, TX 78380 | Oil & Gas Operator | May 1994 |
| 18519 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 18520 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 18521 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Mar 2026 |
| 18522 | Mesa Gulf Coast LLC | | Oil & Gas Operator | Dec 2020 |
| 18523 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 18524 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 18525 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 18526 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 18527 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 18528 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 18529 | Mesa Production Company | Amarillo, TX 79189 | Oil & Gas Operator | Dec 1983 |
| 18530 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Jun 2026 |
| 18531 | Mesa VIsta Operating, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2026 |
| 18532 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 18533 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Feb 2026 |
| 18534 | Mescko Producing & Operating Co. Inc. | Burbank, OH 44214 | Oil & Gas Operator | Dec 2025 |
| 18535 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2025 |
| 18536 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Jun 2026 |
| 18537 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 18538 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Jun 2026 |
| 18539 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Feb 2026 |
| 18540 | Messer Helium Cliffside LLC | Bridgewater, NJ 08807 | Gas Operator | Jun 2026 |
| 18541 | Messer LLC | | Gas Operator | Mar 2026 |
| 18542 | Messman Corporation | Wichita, KS 67208 | Oil & Gas Operator | Feb 2026 |
| 18543 | Messman-Rinehart | | Oil & Gas Operator | Mar 1991 |
| 18544 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | Jun 2026 |
| 18545 | Mestena Operating, L.L.C. | Corpus Christ, TX 78401 | Oil & Gas Operator | Aug 2015 |
| 18546 | Mestena Operating, LTD. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2009 |
| 18547 | Mestena, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Nov 2001 |
| 18548 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 18549 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Jun 2026 |
| 18550 | Metano Energy, LP | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2008 |
| 18551 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 18552 | Meteor Developments Inc | Denver, CO BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 18553 | Meter, Erin L. & William J. | Dansville, NY 14437 | Gas Operator | Dec 2024 |
| 18554 | Metgas Co, A Partnership | | Oil & Gas Operator | Dec 2016 |
| 18555 | Methane Productions Inc | Recluse, WY 82725 | Oil & Gas Operator | Apr 2007 |
| 18556 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 18557 | Metro Energy LTD | Scottsdale, AZ 85254 | Oil Operator | Aug 2000 |
| 18558 | Metro Energy, Inc. | Gladstone, MO 64118 | Oil Operator | May 1997 |
| 18559 | Metro Oil Compan | | Oil Operator | Jan 1991 |
| 18560 | Metroplex Barnett Shale LLC | Houston, TX 77001 | Gas Operator | Sep 2008 |
| 18561 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 18562 | Mettz,Carmody & Foster Oil Co | | Oil Operator | May 1990 |
| 18563 | Metzger Ed W & Sue | Junction City, OH 43748 | Oil Operator | Dec 2025 |
| 18564 | Metzger Francis A | Junction City, OH 43748 | Oil & Gas Operator | Dec 1999 |
| 18565 | Metzgers Bob | Junction City, OH 43748 | Oil & Gas Operator | Dec 2025 |
| 18566 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 18567 | Mewbourne Marketing, Inc. | | Oil & Gas Operator | Mar 2013 |
| 18568 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jun 2026 |
| 18569 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 18570 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Jun 2026 |
| 18571 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 18572 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Mar 2026 |
| 18573 | Meyer Richard C Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 18574 | Meyer, David M. | South Wales, NY 14139 | Gas Operator | Dec 2024 |
| 18575 | Meyer, Norbert | Conway Springs, KS 67031 | Oil Operator | Aug 1994 |
| 18576 | Meyer, Ruskin H. Et Al | | Oil Operator | Oct 1980 |
| 18577 | Meyer, Theodore J. | Conway Springs, KS 67031 | Oil Operator | Feb 2026 |
| 18578 | Meyerhoff & Cox Inc | Tulsa, OK 74135-7830 | Oil Operator | Aug 1993 |
| 18579 | Meyers Marsha L | Danville, OH 43014 | Oil & Gas Operator | Dec 2007 |
| 18580 | Meyers-Lasher, Inc. | | Oil & Gas Operator | Mar 1999 |
| 18581 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2025 |
| 18582 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Mar 2026 |
| 18583 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 18584 | Mga Energy Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2025 |
| 18585 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Feb 2026 |
| 18586 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 18587 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 18588 | MGM Oil & Gas Inc. | Ballinger, TX 76821 | Oil & Gas Operator | Jun 2026 |
| 18589 | MGM Well Service, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2004 |
| 18590 | MH Oilfield Service LLC | Amesville, OH 45711 | Oil & Gas Operator | Dec 2023 |
| 18591 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 18592 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jun 2026 |
| 18593 | Mi-Co Oil & Gas LLC | Caddo, TX 76429 | Oil Operator | Jun 2026 |
| 18594 | Mi3 Energy LLC | | Oil & Gas Operator | Apr 2026 |
| 18595 | Miami Oil Producers Inc | Reno, NV 89501 | Oil & Gas Operator | Dec 2012 |
| 18596 | Mica Energy Corp | Lincoln, NE 68516 | Oil & Gas Operator | Dec 2010 |
| 18597 | Mich Geosearch/Eagle O&G | Wichita Falls, TX 76308-1061 | Oil & Gas Operator | Dec 2001 |
| 18598 | Mich-La Oil & Gas Exploration | | Oil & Gas Operator | Jan 1992 |
| 18599 | Michael D Brown | | Oil Operator | Jul 1993 |
| 18600 | Michael D. Traylor LLC | El Dorado, KS 67042 | Oil Operator | Feb 2026 |