| 201 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 202 | Trustar Operating Company Inc. | Austin, TX 78750 | Oil Operator | Feb 2026 |
| 203 | TT Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 204 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 205 | Ubetco, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Feb 2026 |
| 206 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 207 | Viceroy Petroleum GP, LLC | Rockdale, TX 76567 | Oil & Gas Operator | Feb 2010 |
| 208 | Viceroy Petroleum, LP | College Sta, TX 77845 | Oil & Gas Operator | Feb 2026 |
| 209 | Viejo Services, LLC | Boyd, TX 76023 | Oil & Gas Operator | Feb 2026 |
| 210 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 211 | Von Gonten, John Scott | Rockdale, TX 76567 | Oil Operator | Feb 2026 |
| 212 | Voskamp Exploration, Inc. | Midland, TX 79708 | Oil & Gas Operator | Sep 2010 |
| 213 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 214 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 215 | Water Works Engineering, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jan 1998 |
| 216 | Wehunt Oil Company, Inc. | Dallas, TX 75376 | Oil & Gas Operator | Nov 2002 |
| 217 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Feb 2026 |
| 218 | Whitehead Resources, LTD. | Buna, TX 77612 | Oil & Gas Operator | Feb 2026 |
| 219 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Feb 2026 |
| 220 | Wildfire Energy Operating LLC | Houston, TX 77224 | Oil & Gas Operator | Feb 2026 |
| 221 | Wildhorse Resources MNGT Co, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2019 |
| 222 | Wilhite Productions | MC Dade, TX 78650 | Oil & Gas Operator | Oct 2012 |
| 223 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Feb 2026 |
| 224 | Winchester Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Feb 2026 |
| 225 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 226 | Y Oil Company Inc. | Cameron, TX 76520 | Oil & Gas Operator | Feb 2026 |
| 227 | Yanahosa, Inc. | Kountze, TX 77625 | Oil Operator | Feb 2026 |