| 18301 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 18302 | Martino, Joseph C. | Pasadena, TX 77504 | Oil & Gas Operator | Jun 2025 |
| 18303 | Martis Valley Energy, LLC | Wichita Falls, TX 76310 | Oil Operator | Jun 2025 |
| 18304 | Marvel Joseph Shawn | Haskell, OK 74436 | Oil Operator | Mar 2025 |
| 18305 | Marvin L. Muslow | | Oil Operator | Jun 1995 |
| 18306 | Marvin Sanders Oil | Sugar Grove, PA 16350-5612 | Oil & Gas Operator | Dec 2016 |
| 18307 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Jun 2025 |
| 18308 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 18309 | Mary E. Wertalla | | Oil Operator | Dec 1984 |
| 18310 | Marymac Company | Dallas, TX 75219-2362 | Oil & Gas Operator | Mar 2015 |
| 18311 | Marymac Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Sep 2001 |
| 18312 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 18313 | Masa Energy LLC | Houston, TX 77094 | Oil & Gas Operator | Jun 2025 |
| 18314 | Masada Development Company | Lubbock, TX 79416 | Oil & Gas Operator | Nov 2021 |
| 18315 | Masada Oil & Gas | Quanah, TX 79252 | Oil & Gas Operator | Jun 2025 |
| 18316 | Masada Oil & Gas Company LTD. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2025 |
| 18317 | Mascorella, Timothy James | Java Center, NY 14082 | Gas Operator | Dec 2023 |
| 18318 | Mascot Oil Company | Schulenburg, TX 78956 | Oil & Gas Operator | Jun 2025 |
| 18319 | Masek Oil Compan | | Oil Operator | Feb 1984 |
| 18320 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 18321 | Masham Production Corporation | Enid, OK 73702 | Oil & Gas Operator | Aug 2000 |
| 18322 | Mask Thomas B | | Oil & Gas Operator | Jul 1991 |
| 18323 | Mask Thomas B And Markel Ray D | | Oil & Gas Operator | Jul 1991 |
| 18324 | Mask Thomas B And Markel Ray D And Wood K P | | Oil & Gas Operator | Aug 1986 |
| 18325 | Mask Thomas B And Patrick Petroleum Corp | | Oil & Gas Operator | Jun 1992 |
| 18326 | Maskeny Edward D | | Oil & Gas Operator | Jun 1998 |
| 18327 | Mason Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2022 |
| 18328 | Mason John C | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1994 |
| 18329 | Mason Oil Company Inc | Nowata, OK 74048 | Oil Operator | Oct 2007 |
| 18330 | Mason Oil Inc | Blanchard, OK 73010-2903 | Oil & Gas Operator | Feb 2009 |
| 18331 | Mason Producing Inc | Millersburg, OH 44654-2696 | Oil & Gas Operator | Dec 2024 |
| 18332 | Mason Robert A | | Oil Operator | May 1993 |
| 18333 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 18334 | Mason, Harold J. | Waterville, NY 13480 | Gas Operator | Dec 2023 |
| 18335 | Mason, Tommy L | | Oil & Gas Operator | May 2013 |
| 18336 | Mason-Phillips Properties Of Florida | Ville Beach, FL 32250 | Oil Operator | Apr 1999 |
| 18337 | Mass Energy, Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 18338 | Mass Resources, Inc. | | Oil Operator | Jan 2025 |
| 18339 | Massad George H Estate | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2014 |
| 18340 | Massad John M | Holdenville, OK 74848-2629 | Oil & Gas Operator | Oct 2017 |
| 18341 | Massad Oil Company | Holdenville, OK 74848-2629 | Oil Operator | Mar 2025 |
| 18342 | Massey Group, Inc. | | Oil & Gas Operator | Dec 2004 |
| 18343 | Massey, Gary R. | Eureka, KS 67045 | Oil Operator | Feb 2025 |
| 18344 | Massie Oil Company | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 18345 | Massie, Everett J | Philpot, KY 42366 | Oil Operator | Dec 2023 |
| 18346 | Massingill & McCutchin | Lubbock, TX 79424 | Oil & Gas Operator | Aug 2003 |
| 18347 | Mastel, Francis E. | Rantoul, KS 66079 | Oil Operator | Oct 2009 |
| 18348 | Master Pet & Devel Co Inc | Grand Junction, CO 81503 | Oil & Gas Operator | Jul 1999 |
| 18349 | Master Well Works, Inc. | | Oil Operator | Dec 2024 |
| 18350 | Masters Dorothy V | Davis, OK 73030-0397 | Oil & Gas Operator | May 2020 |
| 18351 | Masters Loy C | Davis, OK 73030-0397 | Oil & Gas Operator | Apr 2005 |
| 18352 | Masters Oil & Gas, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2025 |
| 18353 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 18354 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 18355 | Mastodon Operating Company, LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2025 |
| 18356 | Mat Oil & Gas Exploration Inc | Indiana, PA 15701-8931 | Gas Operator | Dec 1993 |
| 18357 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 18358 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 18359 | Matador Exploration, Inc. | Sedan, KS 67361 | Oil Operator | Apr 2001 |
| 18360 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 18361 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Oct 2024 |
| 18362 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 18363 | Matador, Inc. | Sedan, KS 67361 | Oil Operator | Sep 2024 |
| 18364 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 18365 | Materi Exploration Inc | Upton, WY 82730 | Oil Operator | Nov 2021 |
| 18366 | Matherly Elaine | Bristow, OK 74010-9536 | Oil Operator | Mar 2015 |
| 18367 | Mathews & Casselman Oil Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 18368 | Mathews Billy J | Morris, OK 74445-4826 | Oil & Gas Operator | Mar 2025 |
| 18369 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 18370 | Mathews Roger Dba Mathews Oil/Trans Energy | Kellyville, OK 74039 | Oil Operator | Mar 2025 |
| 18371 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Jun 2025 |
| 18372 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 18373 | Matlock, Randall K. | Topeka, KS 66607 | Oil Operator | May 2000 |
| 18374 | Matna Enterprises LLC | Maud, OK 74854-2812 | Oil & Gas Operator | Feb 2025 |
| 18375 | Mator LLC | Hennessey, OK 73742-1235 | Oil & Gas Operator | Apr 2025 |
| 18376 | Matoush Wade E | | Oil & Gas Operator | Mar 2014 |
| 18377 | Matrex LLC | | Gas Operator | May 2006 |
| 18378 | Matriks Energy LLC | Ashland, KY 41102 | Gas Operator | Dec 2021 |
| 18379 | Matrix Energy LLC | | Oil & Gas Operator | Apr 2013 |
| 18380 | Matrix Exploration And Development LLC | | Oil & Gas Operator | Oct 2008 |
| 18381 | Matrix New Mexico Operating Company LLC | Sugarland, TX 77479 | Oil & Gas Operator | Aug 2010 |
| 18382 | Matrix Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2001 |
| 18383 | Matrix Oil Corporation | | Oil & Gas Operator | Apr 2025 |
| 18384 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | Jun 2025 |
| 18385 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 18386 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Mar 2025 |
| 18387 | Matt Prod Enterprises | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2017 |
| 18388 | Mattco Petroleum | | Oil & Gas Operator | Dec 1988 |
| 18389 | Mattea Oil & Gas LLC | Drumright, OK 74023 | Oil & Gas Operator | Nov 2024 |
| 18390 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 18391 | Matthews Kenneth (Butch) | Konawa, OK 74849-0310 | Oil Operator | Jan 2025 |
| 18392 | Matthews Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Mar 2025 |
| 18393 | Matthews Oil & Gas LLC | Weleetka, OK 74880-7312 | Oil & Gas Operator | Apr 2020 |
| 18394 | Matthews Operating Co., Inc. | | Gas Operator | Aug 2001 |
| 18395 | Matthews-Bunn Operating Co. | | Oil & Gas Operator | Apr 1981 |
| 18396 | Mattingly, Inc. | Wichita, KS 67226 | Gas Operator | Jun 2011 |
| 18397 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 18398 | Matuk, Edward C. | Neodesha, KS 66757 | Oil Operator | Aug 1989 |
| 18399 | Matzinger & Bell Inc-Carl O&G | | Oil & Gas Operator | Dec 1981 |
| 18400 | Matzinger & Bell, Inc. | | Oil & Gas Operator | Dec 1982 |