| 2701 | Marathon Oil Co.-Rocky Mountain Region | Cody, WY 82414 | Oil Operator | Dec 1999 |
| 2702 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 2703 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Jun 2026 |
| 2704 | Marco Oil Compan | | Oil & Gas Operator | Aug 1992 |
| 2705 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Jun 2026 |
| 2706 | Marden Producing | | Gas Operator | Aug 1990 |
| 2707 | Marden Producing Company | Edmond, OK 73083 | Gas Operator | May 2026 |
| 2708 | Marexco | | Oil & Gas Operator | Nov 1994 |
| 2709 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | May 2026 |
| 2710 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 2711 | Mariah Operating Company, LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2009 |
| 2712 | Marjo Incorporat | | Oil & Gas Operator | Jun 1990 |
| 2713 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 2714 | Mark Oil, Inc. | Chanute, KS 66720 | Oil Operator | Feb 2025 |
| 2715 | Markan Oil Incor | | Oil Operator | Mar 1991 |
| 2716 | Marker Oil Compa | | Oil Operator | Jul 1985 |
| 2717 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2026 |
| 2718 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 2719 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 2720 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 2721 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 2722 | Marrs, Richard L.(Deceased) | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2013 |
| 2723 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | May 2026 |
| 2724 | Marshall Lew L O | | Oil Operator | Jun 1994 |
| 2725 | Marshall Oil LLC | Eureka, KS 67045 | Oil Operator | May 2026 |
| 2726 | Marshel Inv | | Oil Operator | Oct 1991 |
| 2727 | Martec Petroleum | | Oil Operator | Jan 1984 |
| 2728 | Martin J S Oil O | | Oil & Gas Operator | Apr 1991 |
| 2729 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | May 2026 |
| 2730 | Martin Oil Produ | | Oil & Gas Operator | Dec 1994 |
| 2731 | Martin Oil Producers, Inc. | Garland, TX 75046 | Oil & Gas Operator | Aug 2013 |
| 2732 | Martin Oil Properties | | Oil Operator | Dec 2009 |
| 2733 | Martin Phillips | | Oil Operator | Dec 1987 |
| 2734 | Martin, Bob | Wann, OK 74083 | Oil & Gas Operator | Sep 2007 |
| 2735 | Martin, Dail D. | Madison, KS 66860 | Oil Operator | Dec 2019 |
| 2736 | Martin, Philip H. | Ellis, KS 67637 | Oil Operator | Apr 2000 |
| 2737 | Martindale Enter | | Oil & Gas Operator | Oct 1996 |
| 2738 | Masek Oil Compan | | Oil Operator | Feb 1984 |
| 2739 | Massey, Gary R. | Eureka, KS 67045 | Oil Operator | May 2026 |
| 2740 | Mastel, Francis E. | Rantoul, KS 66079 | Oil Operator | Oct 2009 |
| 2741 | Matador Exploration, Inc. | Sedan, KS 67361 | Oil Operator | Apr 2001 |
| 2742 | Matador, Inc. | Sedan, KS 67361 | Oil Operator | Aug 2025 |
| 2743 | Matlock, Randall K. | Topeka, KS 66607 | Oil Operator | May 2000 |
| 2744 | Mattingly, Inc. | Wichita, KS 67226 | Gas Operator | Jun 2011 |
| 2745 | Matuk, Edward C. | Neodesha, KS 66757 | Oil Operator | Aug 1989 |
| 2746 | Mauslein, Lenore | Wellsville, KS 66092 | Oil Operator | Oct 2001 |
| 2747 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Sep 2026 |
| 2748 | Max Oil Company | Blackwell, OK 74631 | Oil & Gas Operator | Apr 2024 |
| 2749 | Max Oil LLC | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 2750 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 2751 | Maxam Incorporat | | Oil Operator | Jun 1991 |
| 2752 | Maxcrude, LLC | Winfield, KS 67156 | Oil & Gas Operator | May 2026 |
| 2753 | Maxus Exploratio | | Oil Operator | Jun 1991 |
| 2754 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 2755 | Mayhew Properties | | Gas Operator | May 2026 |
| 2756 | Mays Oil LLC | | Oil Operator | Apr 2021 |
| 2757 | Mays, Sam W., Jr. Estate | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2005 |
| 2758 | MB Holdings LLC | Independence, KS 67301 | Oil Operator | May 2026 |
| 2759 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2026 |
| 2760 | MC C Oil Co Inc | Sedan, KS 67361 | Oil Operator | Apr 2016 |
| 2761 | McCandless Rober | | Oil & Gas Operator | May 1991 |
| 2762 | McCann Drilling | | Oil & Gas Operator | Oct 1996 |
| 2763 | McCann Drilling, Inc. | Bartlesville, OK 74003 | Oil Operator | Mar 2011 |
| 2764 | McCann Mark Wind | | Oil & Gas Operator | Dec 1994 |
| 2765 | McCann Petroleum, Inc. | Sedan, KS 67361 | Oil & Gas Operator | Jul 1998 |
| 2766 | McCarthy Oil Co. | | Oil Operator | Dec 1998 |
| 2767 | McCarthy Oil Com | | Oil Operator | Jun 1994 |
| 2768 | McCarthy Tim W - | | Oil Operator | Mar 1994 |
| 2769 | McCarty Francis | | Oil Operator | Sep 1993 |
| 2770 | McClelland Oil - | | Oil Operator | Dec 2009 |
| 2771 | McClelland, C.R. Operations, Inc. | Madison, KS 66860 | Oil Operator | Aug 1998 |
| 2772 | McClure M C Oil | | Oil Operator | Jul 1984 |
| 2773 | McCluskey Willia | | Oil & Gas Operator | Dec 1990 |
| 2774 | McConnell Oil Properties | | Oil Operator | May 2026 |
| 2775 | McCorgary Operations | | Oil & Gas Operator | Mar 2026 |
| 2776 | McCorkle, Frank R. & Kathleen A. | Sedan, KS 67361 | Oil Operator | Oct 2009 |
| 2777 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 2778 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | May 2026 |
| 2779 | McCoy Production | El Dorado, KS 67042 | Oil Operator | Dec 2019 |
| 2780 | McCoy, Jon | Erie, KS 66733 | Oil Operator | May 2026 |
| 2781 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 2782 | McFadden Oil Co. | | Oil Operator | May 2026 |
| 2783 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jul 2026 |
| 2784 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 2785 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 2786 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 2787 | McGown Drilling | | Oil Operator | Apr 1993 |
| 2788 | McGown Drilling, Inc. | Mound City, KS 66056 | Oil Operator | May 2026 |
| 2789 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | May 2026 |
| 2790 | McIlvain Oil LLC | Madison, KS 66860 | Oil Operator | Dec 2017 |
| 2791 | McKelvy A D Oil | | Gas Operator | Feb 1995 |
| 2792 | McLester Oil & G | | Oil & Gas Operator | Jun 1992 |
| 2793 | McLouth Operating Company, Inc. | Kansas City, MO 64106 | Oil Operator | Aug 1999 |
| 2794 | McMillan, David | FT. Worth, TX 76107 | Oil Operator | Aug 2001 |
| 2795 | McMillan, L.L.C. | Sedan, KS 67361 | Oil Operator | Dec 2019 |
| 2796 | McMillen, Clay Eugene (Gene) | Chanute, KS 66720 | Oil Operator | Aug 1997 |
| 2797 | McMullin Well Se | | Oil & Gas Operator | Sep 1995 |
| 2798 | McMullin, Douglas | Wellsville, KS 66092 | Oil Operator | Apr 2026 |
| 2799 | McNeish Oil Oper | | Oil & Gas Operator | Feb 1991 |
| 2800 | McNeish Oil Operations | | Oil Operator | Nov 2019 |