| 1 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 2 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Oct 2025 |
| 3 | Radtke, D.E. & Associates, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2004 |
| 4 | Randa Operating, Inc. | Big Lake, TX 76932 | Oil Operator | Oct 2025 |
| 5 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 6 | Ratex Energy Inc. | Manchaca, TX 78652 | Oil & Gas Operator | Sep 2002 |
| 7 | Rayden | Midland, TX 79711 | Oil & Gas Operator | Oct 2025 |
| 8 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 9 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 2025 |
| 10 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Oct 2025 |
| 11 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 12 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Oct 2025 |
| 13 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 14 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 15 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 16 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 17 | RHB Exploration & Production,LLC | Grapevine, TX 76099 | Oil & Gas Operator | Oct 2025 |
| 18 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 19 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 20 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 21 | Riley Production | Throckmorton, TX 76483 | Oil & Gas Operator | Oct 2025 |
| 22 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 23 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 24 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 25 | Rivercity Operating, Inc. | Austin, TX 78766 | Oil & Gas Operator | Oct 2025 |
| 26 | RMC Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1996 |
| 27 | Robert C. Brower, LLC | Southlake, TX 76092 | Oil & Gas Operator | Oct 2025 |
| 28 | Roca Production, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 29 | Rockwood Resources Inc | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |
| 30 | Rover Petroleum Operating, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2025 |
| 31 | Rowland, Rex D. | Midland, TX 79701 | Oil & Gas Operator | Dec 2017 |