| 18401 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 18402 | Mason, Harold J. | Waterville, NY 13480 | Gas Operator | Dec 2024 |
| 18403 | Mason, Tommy L | | Oil & Gas Operator | May 2013 |
| 18404 | Mason-Phillips Properties Of Florida | Ville Beach, FL 32250 | Oil Operator | Apr 1999 |
| 18405 | Mass Energy, Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 18406 | Mass Resources, Inc. | | Oil Operator | Jan 2025 |
| 18407 | Massad George H Estate | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2014 |
| 18408 | Massad John M | Holdenville, OK 74848-2629 | Oil & Gas Operator | Oct 2017 |
| 18409 | Massad Oil Company | Holdenville, OK 74848-2629 | Oil Operator | Sep 2025 |
| 18410 | Massey Group, Inc. | | Oil & Gas Operator | Dec 2004 |
| 18411 | Massey, Gary R. | Eureka, KS 67045 | Oil Operator | Jun 2025 |
| 18412 | Massie Oil Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 18413 | Massie, Everett J | Philpot, KY 42366 | Oil Operator | Dec 2023 |
| 18414 | Massingill & McCutchin | Lubbock, TX 79424 | Oil & Gas Operator | Aug 2003 |
| 18415 | Mastel, Francis E. | Rantoul, KS 66079 | Oil Operator | Oct 2009 |
| 18416 | Master Pet & Devel Co Inc | Grand Junction, CO 81503 | Oil & Gas Operator | Jul 1999 |
| 18417 | Master Well Works, Inc. | | Oil Operator | Dec 2024 |
| 18418 | Masters Dorothy V | Davis, OK 73030-0397 | Oil & Gas Operator | May 2020 |
| 18419 | Masters Loy C | Davis, OK 73030-0397 | Oil & Gas Operator | Apr 2005 |
| 18420 | Masters Oil & Gas, LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 18421 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 18422 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 18423 | Mastodon Operating Company, LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 18424 | Mat Oil & Gas Exploration Inc | Indiana, PA 15701-8931 | Gas Operator | Dec 1993 |
| 18425 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 18426 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 18427 | Matador Exploration, Inc. | Sedan, KS 67361 | Oil Operator | Apr 2001 |
| 18428 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 18429 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Oct 2024 |
| 18430 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 18431 | Matador, Inc. | Sedan, KS 67361 | Oil Operator | Mar 2025 |
| 18432 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 18433 | Materi Exploration Inc | Upton, WY 82730 | Oil Operator | Nov 2021 |
| 18434 | Matherly Elaine | Bristow, OK 74010-9536 | Oil Operator | Mar 2015 |
| 18435 | Mathews & Casselman Oil Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 18436 | Mathews Billy J | Morris, OK 74445-4826 | Oil & Gas Operator | Aug 2025 |
| 18437 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 18438 | Mathews Roger Dba Mathews Oil/Trans Energy | Kellyville, OK 74039 | Oil Operator | Oct 2025 |
| 18439 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Dec 2025 |
| 18440 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 18441 | Matlock, Randall K. | Topeka, KS 66607 | Oil Operator | May 2000 |
| 18442 | Matna Enterprises LLC | Maud, OK 74854-2812 | Oil & Gas Operator | Aug 2025 |
| 18443 | Mator LLC | Hennessey, OK 73742-1235 | Oil & Gas Operator | Oct 2025 |
| 18444 | Matoush Wade E | | Oil & Gas Operator | Mar 2014 |
| 18445 | Matrex LLC | | Gas Operator | May 2006 |
| 18446 | Matriks Energy LLC | Ashland, KY 41102 | Gas Operator | Dec 2021 |
| 18447 | Matrix Energy LLC | | Oil & Gas Operator | Apr 2013 |
| 18448 | Matrix Exploration And Development LLC | | Oil & Gas Operator | Oct 2008 |
| 18449 | Matrix New Mexico Operating Company LLC | Sugarland, TX 77479 | Oil & Gas Operator | Aug 2010 |
| 18450 | Matrix Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2001 |
| 18451 | Matrix Oil Corporation | | Oil & Gas Operator | Sep 2025 |
| 18452 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | Dec 2025 |
| 18453 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 18454 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Oct 2025 |
| 18455 | Matt Prod Enterprises | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2017 |
| 18456 | Mattco Petroleum | | Oil & Gas Operator | Dec 1988 |
| 18457 | Mattea Oil & Gas LLC | Drumright, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 18458 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 18459 | Matthews Kenneth (Butch) | Konawa, OK 74849-0310 | Oil Operator | Sep 2025 |
| 18460 | Matthews Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Oct 2025 |
| 18461 | Matthews Oil & Gas LLC | Weleetka, OK 74880-7312 | Oil & Gas Operator | Apr 2020 |
| 18462 | Matthews Operating Co., Inc. | | Gas Operator | Aug 2001 |
| 18463 | Matthews-Bunn Operating Co. | | Oil & Gas Operator | Apr 1981 |
| 18464 | Mattingly, Inc. | Wichita, KS 67226 | Gas Operator | Jun 2011 |
| 18465 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 18466 | Matuk, Edward C. | Neodesha, KS 66757 | Oil Operator | Aug 1989 |
| 18467 | Matzinger & Bell Inc-Carl O&G | | Oil & Gas Operator | Dec 1981 |
| 18468 | Matzinger & Bell, Inc. | | Oil & Gas Operator | Dec 1982 |
| 18469 | Matzinger Expl Co& Texas Crude | | Oil & Gas Operator | Jun 1980 |
| 18470 | Matzinger Petroleum Co. | | Oil & Gas Operator | Jan 1991 |
| 18471 | Maurine B. Pyle | | Oil & Gas Operator | Mar 1993 |
| 18472 | Mauro J. Dentino | | Oil Operator | Sep 2025 |
| 18473 | Mauslein, Lenore | Wellsville, KS 66092 | Oil Operator | Oct 2001 |
| 18474 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Oct 2025 |
| 18475 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 18476 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 18477 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 18478 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 18479 | Maverick Exploration And Production Inc | | Oil & Gas Operator | Nov 2025 |
| 18480 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil Operator | Dec 2025 |
| 18481 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Dec 2025 |
| 18482 | Maverick Oil Company LLC | Pasadena, TX 77505 | Oil Operator | Dec 2025 |
| 18483 | Maverick Oil Corp. | | Oil Operator | May 1997 |
| 18484 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 18485 | Maverick Permian LLC | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 18486 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 18487 | Maverick Producers, Inc. | | Oil Operator | May 2012 |
| 18488 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 18489 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 18490 | Max Oil Company | Blackwell, OK 74631 | Oil & Gas Operator | Apr 2024 |
| 18491 | Max Oil LLC | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 18492 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 18493 | Maxam Incorporat | | Oil Operator | Jun 1991 |
| 18494 | Maxcrude, LLC | Winfield, KS 67156 | Oil & Gas Operator | Jun 2025 |
| 18495 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 18496 | Maxie D, Inc. | Laguna Niguel, CA 92677 | Gas Operator | Feb 1998 |
| 18497 | Maxim Drilling & Expl Inc | Gillette, WY 82717 | Oil & Gas Operator | Oct 2025 |
| 18498 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Oct 2025 |
| 18499 | Maxim Energy Inc Dba Maxim Tep Inc | | Oil Operator | Dec 2009 |
| 18500 | Maxim Resources LTD U.S.A. | | Oil & Gas Operator | Dec 1997 |