| 701 | Matrix Oil Corporation | | Oil & Gas Operator | Jul 2025 |
| 702 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2025 |
| 703 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 704 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Jul 2025 |
| 705 | Matt Prod Enterprises | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2017 |
| 706 | Mattco Petroleum | | Oil & Gas Operator | Dec 1988 |
| 707 | Mattea Oil & Gas LLC | Drumright, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 708 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 709 | Matthews Kenneth (Butch) | Konawa, OK 74849-0310 | Oil Operator | May 2025 |
| 710 | Matthews Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 711 | Matthews Oil & Gas LLC | Weleetka, OK 74880-7312 | Oil & Gas Operator | Apr 2020 |
| 712 | Matthews Operating Co., Inc. | | Gas Operator | Aug 2001 |
| 713 | Matthews-Bunn Operating Co. | | Oil & Gas Operator | Apr 1981 |
| 714 | Mattingly, Inc. | Wichita, KS 67226 | Gas Operator | Jun 2011 |
| 715 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 716 | Matuk, Edward C. | Neodesha, KS 66757 | Oil Operator | Aug 1989 |
| 717 | Matzinger & Bell Inc-Carl O&G | | Oil & Gas Operator | Dec 1981 |
| 718 | Matzinger & Bell, Inc. | | Oil & Gas Operator | Dec 1982 |
| 719 | Matzinger Petroleum Co. | | Oil & Gas Operator | Jan 1991 |
| 720 | Maurine B. Pyle | | Oil & Gas Operator | Mar 1993 |
| 721 | Mauro J. Dentino | | Oil Operator | Jun 2025 |
| 722 | Mauslein, Lenore | Wellsville, KS 66092 | Oil Operator | Oct 2001 |
| 723 | Maverick Brothers Operating,Inc. | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 724 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | May 2025 |
| 725 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 726 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Sep 2025 |
| 727 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2025 |
| 728 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 729 | Maverick Exploration And Production Inc | | Oil & Gas Operator | Jul 2025 |
| 730 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil Operator | Sep 2025 |
| 731 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Sep 2025 |
| 732 | Maverick Oil Corp. | | Oil Operator | May 1997 |
| 733 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 734 | Maverick Permian LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 735 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 736 | Maverick Producers, Inc. | | Oil Operator | May 2012 |
| 737 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 738 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 739 | Max Oil Company | Blackwell, OK 74631 | Oil & Gas Operator | Apr 2024 |
| 740 | Max Oil LLC | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 741 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 742 | Maxam Incorporat | | Oil Operator | Jun 1991 |
| 743 | Maxcrude, LLC | Winfield, KS 67156 | Oil & Gas Operator | Apr 2025 |
| 744 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 745 | Maxie D, Inc. | Laguna Niguel, CA 92677 | Gas Operator | Feb 1998 |
| 746 | Maxim Drilling & Expl Inc | Gillette, WY 82717 | Oil & Gas Operator | Jul 2025 |
| 747 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | May 2025 |
| 748 | Maxim Energy Inc Dba Maxim Tep Inc | | Oil Operator | Dec 2009 |
| 749 | Maxim Resources LTD U.S.A. | | Oil & Gas Operator | Dec 1997 |
| 750 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 751 | Maximum Energy Development, LLC | Glasgow, KY 42142 | Oil Operator | Dec 2022 |
| 752 | Maximum Lease Service, Inc | Eunice, NM 88231 | Oil & Gas Operator | Jun 2025 |
| 753 | Maximum Oil & Gas, Inc | | Gas Operator | Dec 2023 |
| 754 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 755 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 756 | Maxland Oil Company | Haslet, TX 76052-5137 | Oil Operator | Nov 2014 |
| 757 | Maxoil Inc. | | Oil & Gas Operator | Dec 2004 |
| 758 | Maxson Gas Corp | Shinglehouse, PA 16748-0436 | Oil & Gas Operator | Dec 2024 |
| 759 | Maxson Lawrence C | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2016 |
| 760 | Maxum Energy Corp | Plano, TX 75025 | Oil & Gas Operator | Jan 2003 |
| 761 | Maxus Exploratio | | Oil Operator | Jun 1991 |
| 762 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 763 | Maxwell Bros | Clarion, PA 16214-7446 | Oil & Gas Operator | Dec 2024 |
| 764 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 765 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 766 | Maxwell Resources Corporation | Oklahoma City, OK 73116-7746 | Oil & Gas Operator | Apr 2009 |
| 767 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 768 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 769 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 770 | May Energy Company | Stroud, OK 74079 | Oil & Gas Operator | May 2013 |
| 771 | May Gas, Inc. | | Oil & Gas Operator | Dec 2008 |
| 772 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 773 | May Oil & Gas, L.L.C. | | Oil & Gas Operator | Dec 2013 |
| 774 | May Petroleum, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 775 | Maya Oil LLC | | Oil Operator | Jul 2025 |
| 776 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Apr 2025 |
| 777 | Maybrier Brothers | | Oil Operator | Apr 2006 |
| 778 | Maybrier Production, L.L.C. | | Oil Operator | Oct 2022 |
| 779 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Sep 2025 |
| 780 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 781 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 782 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Sep 2025 |
| 783 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Sep 2025 |
| 784 | Mayfield SWD LLC | McKinney, TX 75070-5020 | Oil Operator | Aug 2021 |
| 785 | Mayhar N D | Eufaula, OK 74432 | Oil Operator | Apr 2015 |
| 786 | Mayhew Properties | | Gas Operator | Apr 2025 |
| 787 | Mayjac I, LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2025 |
| 788 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 789 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 790 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 791 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 792 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Sep 2025 |
| 793 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Sep 2025 |
| 794 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 795 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 796 | Mays Coal Co | Clarion, PA 16214-0447 | Gas Operator | Dec 2003 |
| 797 | Mays Gas & Coal Co | Clarion, PA 16214-0447 | Oil & Gas Operator | Dec 2024 |
| 798 | Mays Oil LLC | | Oil Operator | Apr 2021 |
| 799 | Mays, Sam W., Jr. Estate | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2005 |
| 800 | Mayshark, James Page | Sherman, NY 14781 | Gas Operator | Dec 2024 |