| 18601 | Massey Group, Inc. | | Oil & Gas Operator | Dec 2004 |
| 18602 | Massey, Gary R. | Eureka, KS 67045 | Oil Operator | Dec 2024 |
| 18603 | Massie Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 18604 | Massie, Everett J | Philpot, KY 42366 | Oil Operator | Dec 2023 |
| 18605 | Massingill & McCutchin | Lubbock, TX 79424 | Oil & Gas Operator | Aug 2003 |
| 18606 | Mastel, Francis E. | Rantoul, KS 66079 | Oil Operator | Oct 2009 |
| 18607 | Master Pet & Devel Co Inc | Grand Junction, CO 81503 | Oil & Gas Operator | Jul 1999 |
| 18608 | Master Well Works, Inc. | | Oil Operator | Dec 2024 |
| 18609 | Masters Dorothy V | Davis, OK 73030-0397 | Oil & Gas Operator | May 2020 |
| 18610 | Masters Loy C | Davis, OK 73030-0397 | Oil & Gas Operator | Apr 2005 |
| 18611 | Masters Oil & Gas, LLC | Houston, TX 77079 | Oil & Gas Operator | Apr 2025 |
| 18612 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 18613 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 18614 | Mastodon Operating Company, LLC | Houston, TX 77027 | Oil & Gas Operator | Apr 2025 |
| 18615 | Mat Oil & Gas Exploration Inc | Indiana, PA 15701-8931 | Gas Operator | Dec 1993 |
| 18616 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 18617 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 18618 | Matador Exploration, Inc. | Sedan, KS 67361 | Oil Operator | Apr 2001 |
| 18619 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 18620 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Oct 2024 |
| 18621 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 18622 | Matador, Inc. | Sedan, KS 67361 | Oil Operator | Sep 2024 |
| 18623 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 18624 | Materi Exploration Inc | Upton, WY 82730 | Oil Operator | Nov 2021 |
| 18625 | Matherly Elaine | Bristow, OK 74010-9536 | Oil Operator | Mar 2015 |
| 18626 | Mathews & Casselman Oil Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 18627 | Mathews Billy J | Morris, OK 74445-4826 | Oil & Gas Operator | Feb 2025 |
| 18628 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 18629 | Mathews Roger Dba Mathews Oil/Trans Energy | Kellyville, OK 74039 | Oil Operator | Jan 2025 |
| 18630 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Apr 2025 |
| 18631 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 18632 | Matlock, Randall K. | Topeka, KS 66607 | Oil Operator | May 2000 |
| 18633 | Matna Enterprises LLC | Maud, OK 74854-2812 | Oil & Gas Operator | Dec 2024 |
| 18634 | Mator LLC | Hennessey, OK 73742-1235 | Oil & Gas Operator | Feb 2025 |
| 18635 | Matoush Wade E | | Oil & Gas Operator | Mar 2014 |
| 18636 | Matrex LLC | | Gas Operator | May 2006 |
| 18637 | Matriks Energy LLC | Ashland, KY 41102 | Gas Operator | Dec 2021 |
| 18638 | Matrix Energy LLC | | Oil & Gas Operator | Apr 2013 |
| 18639 | Matrix Exploration And Development LLC | | Oil & Gas Operator | Oct 2008 |
| 18640 | Matrix New Mexico Operating Company LLC | Sugarland, TX 77479 | Oil & Gas Operator | Aug 2010 |
| 18641 | Matrix Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2001 |
| 18642 | Matrix Oil Corporation | | Oil & Gas Operator | Dec 2024 |
| 18643 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | Apr 2025 |
| 18644 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 18645 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Jan 2025 |
| 18646 | Matt Prod Enterprises | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2017 |
| 18647 | Mattco Petroleum | | Oil & Gas Operator | Dec 1988 |
| 18648 | Mattea Oil & Gas LLC | Drumright, OK 74023 | Oil & Gas Operator | Nov 2024 |
| 18649 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 18650 | Matthews Kenneth (Butch) | Konawa, OK 74849-0310 | Oil Operator | Jan 2025 |
| 18651 | Matthews Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Jan 2025 |
| 18652 | Matthews Oil & Gas LLC | Weleetka, OK 74880-7312 | Oil & Gas Operator | Apr 2020 |
| 18653 | Matthews Operating Co., Inc. | | Gas Operator | Aug 2001 |
| 18654 | Matthews-Bunn Operating Co. | | Oil & Gas Operator | Apr 1981 |
| 18655 | Mattingly, Inc. | Wichita, KS 67226 | Gas Operator | Jun 2011 |
| 18656 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 18657 | Matuk, Edward C. | Neodesha, KS 66757 | Oil Operator | Aug 1989 |
| 18658 | Matzinger & Bell Inc-Carl O&G | | Oil & Gas Operator | Dec 1981 |
| 18659 | Matzinger & Bell, Inc. | | Oil & Gas Operator | Dec 1982 |
| 18660 | Matzinger Expl Co& Texas Crude | | Oil & Gas Operator | Jun 1980 |
| 18661 | Matzinger Petroleum Co. | | Oil & Gas Operator | Jan 1991 |
| 18662 | Mauldin Robert | Barnsdall, OK 74002 | Oil Operator | Jan 2025 |
| 18663 | Maurine B. Pyle | | Oil & Gas Operator | Mar 1993 |
| 18664 | Mauro J. Dentino | | Oil Operator | Dec 2024 |
| 18665 | Mauslein, Lenore | Wellsville, KS 66092 | Oil Operator | Oct 2001 |
| 18666 | Maverick Brothers Operating,Inc. | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 18667 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Jan 2025 |
| 18668 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 18669 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 18670 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 18671 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 18672 | Maverick Exploration And Production Inc | | Oil & Gas Operator | Jun 2024 |
| 18673 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil Operator | Apr 2025 |
| 18674 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Apr 2025 |
| 18675 | Maverick Oil Corp. | | Oil Operator | May 1997 |
| 18676 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 18677 | Maverick Permian LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 18678 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 18679 | Maverick Producers, Inc. | | Oil Operator | May 2012 |
| 18680 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 18681 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 18682 | Max Oil Company | Blackwell, OK 74631-6329 | Oil & Gas Operator | Apr 2024 |
| 18683 | Max Oil LLC | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 18684 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 18685 | Maxam Incorporat | | Oil Operator | Jun 1991 |
| 18686 | Maxcrude, LLC | Winfield, KS 67156 | Oil & Gas Operator | Dec 2024 |
| 18687 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 18688 | Maxey Homer G | | Oil & Gas Operator | Nov 1997 |
| 18689 | Maxie D, Inc. | Laguna Niguel, CA 92677 | Gas Operator | Feb 1998 |
| 18690 | Maxim Drilling & Expl Inc | Gillette, WY 82717 | Oil & Gas Operator | Feb 2025 |
| 18691 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jan 2025 |
| 18692 | Maxim Energy Inc Dba Maxim Tep Inc | | Oil Operator | Dec 2009 |
| 18693 | Maxim Resources LTD U.S.A. | | Oil & Gas Operator | Dec 1997 |
| 18694 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 18695 | Maximum Energy Development, LLC | Glasgow, KY 42142 | Oil Operator | Dec 2022 |
| 18696 | Maximum Lease Service, Inc | Eunice, NM 88231 | Oil & Gas Operator | Jan 2025 |
| 18697 | Maximum Oil & Gas, Inc | | Gas Operator | Dec 2023 |
| 18698 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 18699 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 18700 | Maxland Oil Company | Haslet, TX 76052-5137 | Oil Operator | Nov 2014 |