| 1 | Aberdeen American Petroleum Co., Inc. | | Oil & Gas Operator | Dec 1989 |
| 2 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 3 | Bay City Minerals, Inc. | | Gas Operator | May 1990 |
| 4 | Calhoun, Clay | | Gas Operator | Sep 1989 |
| 5 | Chevron Oil Company | | Oil & Gas Operator | Dec 1983 |
| 6 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2025 |
| 7 | Currie, V. Monta, Jr. | | Gas Operator | Nov 1990 |
| 8 | Dominex, Inc. | | Gas Operator | Jan 1986 |
| 9 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 10 | El-Oil, LTD. | | Oil & Gas Operator | Jun 2024 |
| 11 | Energy Recovery Group, LLC | | Oil & Gas Operator | Jul 2008 |
| 12 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2025 |
| 13 | Gulf Coast Mineral, LLC | Foley, AL 36535 | Oil & Gas Operator | Jul 2021 |
| 14 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Nov 2024 |
| 15 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 16 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jun 2024 |
| 17 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 18 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 19 | Lee, R.A., Inc. | | Oil Operator | Nov 1972 |
| 20 | Mobile Gulf, Inc. | | Oil & Gas Operator | Aug 1985 |
| 21 | Moon-Hines-Tigrett Operating Co., Inc. | | Oil & Gas Operator | Sep 2024 |
| 22 | Phoenix Resources-Alabama, LLC | | Gas Operator | Nov 2004 |
| 23 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Dec 2024 |
| 24 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 25 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2025 |
| 26 | South Carlton Operating Company, LLC | Natchez, MS 39121 | Oil Operator | Oct 2024 |
| 27 | Tidelands Resources, Inc. | | Gas Operator | Oct 1990 |
| 28 | Williams, Clayton W., Jr. | | Oil & Gas Operator | Jun 1989 |