| 701 | Matthews Operating Co., Inc. | | Gas Operator | Aug 2001 |
| 702 | Mattingly, Inc. | Wichita, KS 67226 | Gas Operator | Jun 2011 |
| 703 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 704 | Matuk, Edward C. | Neodesha, KS 66757 | Oil Operator | Aug 1989 |
| 705 | Matzinger & Bell Inc-Carl O&G | | Oil & Gas Operator | Dec 1981 |
| 706 | Matzinger & Bell, Inc. | | Oil & Gas Operator | Dec 1982 |
| 707 | Matzinger Petroleum Co. | | Oil & Gas Operator | Jan 1991 |
| 708 | Maurine B. Pyle | | Oil & Gas Operator | Mar 1993 |
| 709 | Mauro J. Dentino | | Oil Operator | Dec 2025 |
| 710 | Mauslein, Lenore | Wellsville, KS 66092 | Oil Operator | Oct 2001 |
| 711 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Feb 2026 |
| 712 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 713 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 714 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2026 |
| 715 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 716 | Maverick Exploration And Production Inc | | Oil & Gas Operator | Mar 2026 |
| 717 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil & Gas Operator | Jun 2026 |
| 718 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Jun 2026 |
| 719 | Maverick Oil Company LLC | Pasadena, TX 77505 | Oil Operator | Jun 2026 |
| 720 | Maverick Oil Corp. | | Oil Operator | May 1997 |
| 721 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 722 | Maverick Permian LLC | Keithville, LA 71047 | Oil & Gas Operator | Jun 2026 |
| 723 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 724 | Maverick Producers, Inc. | | Oil Operator | May 2012 |
| 725 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 726 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 727 | Max Oil Company | Blackwell, OK 74631 | Oil & Gas Operator | Apr 2024 |
| 728 | Max Oil LLC | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 729 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 730 | Maxam Incorporat | | Oil Operator | Jun 1991 |
| 731 | Maxcrude, LLC | Winfield, KS 67156 | Oil & Gas Operator | Feb 2026 |
| 732 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 733 | Maxim Drilling & Expl Inc | Gillette, WY 82717 | Oil & Gas Operator | Mar 2026 |
| 734 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Feb 2026 |
| 735 | Maxim Energy Inc Dba Maxim Tep Inc | | Oil Operator | Dec 2009 |
| 736 | Maxim Resources LTD U.S.A. | | Oil & Gas Operator | Dec 1997 |
| 737 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 738 | Maximum Energy Development, LLC | Glasgow, KY 42142 | Oil Operator | Dec 2022 |
| 739 | Maximum Lease Service, Inc | Eunice, NM 88231 | Oil & Gas Operator | Mar 2026 |
| 740 | Maximum Oil & Gas, Inc | | Gas Operator | Dec 2024 |
| 741 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 742 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 743 | Maxland Oil Company | Haslet, TX 76052-5137 | Oil Operator | Nov 2014 |
| 744 | Maxoil Inc. | | Oil & Gas Operator | Dec 2004 |
| 745 | Maxson Gas Corp | Shinglehouse, PA 16748-0436 | Oil & Gas Operator | Dec 2024 |
| 746 | Maxson Lawrence C | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2016 |
| 747 | Maxum Energy Corp | Plano, TX 75025 | Oil & Gas Operator | Jan 2003 |
| 748 | Maxus Exploratio | | Oil Operator | Jun 1991 |
| 749 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 750 | Maxwell Bros | Clarion, PA 16214-7446 | Oil & Gas Operator | Dec 2025 |
| 751 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 752 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 753 | Maxwell Resources Corporation | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2009 |
| 754 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 755 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 756 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 757 | May Energy Company | Stroud, OK 74079 | Oil & Gas Operator | May 2013 |
| 758 | May Gas, Inc. | | Oil & Gas Operator | Dec 2008 |
| 759 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 760 | May Oil & Gas, L.L.C. | | Oil & Gas Operator | Dec 2013 |
| 761 | May Petroleum Inc | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 762 | Maya Oil LLC | | Oil Operator | Mar 2026 |
| 763 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Oct 2025 |
| 764 | Maybrier Brothers | | Oil Operator | Apr 2006 |
| 765 | Maybrier Production, L.L.C. | | Oil Operator | Oct 2022 |
| 766 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Jun 2026 |
| 767 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 768 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 769 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Jun 2026 |
| 770 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Jun 2026 |
| 771 | Mayfield SWD LLC | McKinney, TX 75070-5020 | Oil Operator | Aug 2021 |
| 772 | Mayhar N D | Eufaula, OK 74432 | Oil Operator | Apr 2015 |
| 773 | Mayhew Properties | | Gas Operator | Feb 2026 |
| 774 | Mayjac I, LLC | Midland, TX 79705 | Oil & Gas Operator | Jun 2026 |
| 775 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 776 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 777 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 778 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 779 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Jun 2026 |
| 780 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Jun 2026 |
| 781 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 782 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 783 | Mays Gas & Coal Co | Clarion, PA 16214-0447 | Oil & Gas Operator | Dec 2025 |
| 784 | Mays Oil LLC | | Oil Operator | Apr 2021 |
| 785 | Mays, Sam W., Jr. Estate | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2005 |
| 786 | Mayshark, James Page | Sherman, NY 14781 | Gas Operator | Dec 2024 |
| 787 | Mazco Energy LLC | San Antonio, TX 78266 | Oil & Gas Operator | Jun 2026 |
| 788 | Mazurkiewicz, Gary, Kimberly, Matt | Perrysburg, NY 14129 | Gas Operator | Dec 2024 |
| 789 | MB Energy, LLC | San Antonio, TX 78233 | Oil & Gas Operator | Jun 2026 |
| 790 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 791 | MB Holdings LLC | Independence, KS 67301 | Oil Operator | Feb 2026 |
| 792 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 793 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 794 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Apr 2026 |
| 795 | MBM Partnership | | Gas Operator | Nov 1991 |
| 796 | MBM Production, LLC | Pikeville, KY 41501 | Oil & Gas Operator | Dec 2024 |
| 797 | Mbo, LLC | | Oil Operator | Jan 2025 |
| 798 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2026 |
| 799 | MBS Resources Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2025 |
| 800 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Jun 2026 |