| 201 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | May 2025 |
| 202 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 203 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 204 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 205 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | May 2025 |
| 206 | Stonebriar Operating, LLC | Plano, TX 75093 | Oil Operator | May 2025 |
| 207 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 208 | SW Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2000 |
| 209 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 210 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 211 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 212 | TDT Production, Inc. | Capitola, CA 95010 | Oil & Gas Operator | Aug 2003 |
| 213 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 214 | Texas Refining, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2003 |
| 215 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 216 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 217 | Texlan Oil Company, L.C. | Tyler, TX 75711 | Oil & Gas Operator | Aug 2003 |
| 218 | TGNR Gulf Coast LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 219 | Treadstone Energy PRTNR Op, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 220 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 221 | Tularosa Operating Company | Kerrville, TX 78029 | Oil & Gas Operator | Mar 2024 |
| 222 | Twojo, Inc. | Longview, TX 75601 | Oil & Gas Operator | Nov 1996 |
| 223 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 224 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 225 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 226 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | May 2025 |
| 227 | Viceroy Petroleum GP, LLC | Rockdale, TX 76567 | Oil & Gas Operator | Feb 2010 |
| 228 | Viceroy Petroleum, LP | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 229 | Vondra Energy Corp. | Alvin, TX 77512 | Oil & Gas Operator | May 2025 |
| 230 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 231 | Warren Production Services | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 232 | Warrior Resources Inc. | Mexia, TX 76667 | Oil & Gas Operator | May 2025 |
| 233 | WCS Oil & Gas Corporation | Dallas, TX 75209 | Oil & Gas Operator | Aug 2021 |
| 234 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 235 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 236 | Whitman-Dome Energy Corporation | San Diego, CA 92101 | Oil & Gas Operator | Nov 1996 |
| 237 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 238 | Wildfire Energy Operating LLC | Houston, TX 77224 | Oil & Gas Operator | May 2025 |
| 239 | Wildhorse Resources MNGT Co, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2019 |
| 240 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 241 | Williams Oil Company | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 242 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 243 | Willo Oil & Gas Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2020 |
| 244 | WJW Operating Co.,LLC | Austin, TX 78738 | Oil & Gas Operator | May 2002 |
| 245 | WTG Exploration Inc | Midland, TX 79705 | Oil & Gas Operator | Dec 2023 |
| 246 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 247 | Zackson Resources, Inc. | Houston, TX 77063 | Oil & Gas Operator | May 2025 |