| 1 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 2 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 3 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 4 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Jul 2025 |
| 5 | Markay Oil & Gas Company | Midland, TX 79701 | Oil & Gas Operator | Sep 1998 |
| 6 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Sep 2025 |
| 7 | Massingill & McCutchin | Lubbock, TX 79424 | Oil & Gas Operator | Aug 2003 |
| 8 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 9 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 10 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 11 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 12 | McDonald Production, LLC | Lubbock, TX 79408 | Oil Operator | Sep 2025 |
| 13 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 14 | Meadco Properties | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 15 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 16 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Sep 2025 |
| 17 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Sep 2025 |
| 18 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 19 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 20 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 21 | Miller, Dyer & Co LLC | Denver, CO 80202 | Oil & Gas Operator | May 2009 |
| 22 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 23 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 24 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Sep 2025 |
| 25 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |