| 201 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 202 | Encore Permian Operating, LLC | Uvalde, TX 78801 | Oil & Gas Operator | Jul 2025 |
| 203 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 204 | Endurance Resources LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2017 |
| 205 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 206 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | May 2025 |
| 207 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Mar 2025 |
| 208 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Apr 2025 |
| 209 | Enerstar Resources, L.C. | Midland, TX 79701 | Oil & Gas Operator | Apr 1999 |
| 210 | Enertex, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 211 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 212 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 213 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 214 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 215 | Eqv Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Jul 2025 |
| 216 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 217 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 218 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 219 | Etc Oil Co. | Pecos, TX 79772 | Oil & Gas Operator | Mar 2004 |
| 220 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 221 | Eureka Prospecting Company | Wimberley, TX 78676 | Oil & Gas Operator | Jun 2023 |
| 222 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 223 | Exl Petroleum Operating Inc. | Midland, TX 79705 | Oil & Gas Operator | Feb 2020 |
| 224 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 225 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 226 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 227 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 228 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 229 | F & M Oil & Gas Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 230 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 231 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Jul 2025 |
| 232 | Fed Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 233 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 234 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2025 |
| 235 | Flat Creek Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 236 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 237 | Forge Energy Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2023 |
| 238 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2025 |
| 239 | Founders Oil & Gas Operating,LLC | Arlington, TX 76011 | Oil & Gas Operator | Jul 2023 |
| 240 | Freedom Energy Inc | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jul 2025 |
| 241 | Freedom Energy, Inc. (I) | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jun 2003 |
| 242 | Freedom Energy, LTD. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jun 2011 |
| 243 | Freeman Energy Inc. (I) | Fredericksbrg, TX 78624 | Oil & Gas Operator | Aug 1996 |
| 244 | G P II Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2020 |
| 245 | Gap Exploration, LTD. | Naples, FL 34110 | Oil & Gas Operator | Jul 2008 |
| 246 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 247 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 248 | Goodnight Midstream Permian, LLC | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 249 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 250 | Grace Petroleum Operating, LLC | Llano, TX 78643 | Oil & Gas Operator | Jul 2025 |
| 251 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 252 | Graham, Bill J. Oil & Gas Corp. | Midland, TX 79710 | Oil & Gas Operator | Nov 2000 |
| 253 | Graystone Exploration Corp. | Garland, TX 75043 | Oil & Gas Operator | Aug 2003 |
| 254 | Great Texas Crude Inc. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Jul 2025 |
| 255 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 256 | Greenlake Energy Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 257 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 258 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 259 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 260 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2025 |
| 261 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 262 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 263 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 264 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 265 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 266 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 267 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 268 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2025 |
| 269 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 270 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 271 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Jul 2025 |
| 272 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 273 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 274 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 275 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Jul 2025 |
| 276 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 277 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 278 | Hopper, Harlan | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 279 | Hopper, Thornton Co. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 280 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 281 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 282 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 283 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 284 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 285 | I & L Development Co. | Dallas, TX 75219 | Oil & Gas Operator | Mar 1996 |
| 286 | Ibex Resources Operating LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2007 |
| 287 | Ibex Resources, LLC | Austin, TX 78751 | Oil & Gas Operator | Jul 1999 |
| 288 | Ica Energy Operating, L.L.C. | Odessa, TX 79760 | Oil & Gas Operator | Jul 2025 |
| 289 | Ice Brothers, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2024 |
| 290 | Incline Energy | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 291 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 292 | Jag Petroleum LLC | Houston, TX 77058 | Oil Operator | Nov 2009 |
| 293 | Jagged Peak Energy LLC | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 294 | Jasper Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1996 |
| 295 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 296 | Jetta Permian, LP | Midland, TX 79701 | Oil & Gas Operator | Jun 2021 |
| 297 | Jilpetco, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | Jul 2025 |
| 298 | Johnson And Price | Midland, TX 79702 | Oil & Gas Operator | Dec 1995 |
| 299 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2025 |
| 300 | Jones Energy, LTD. | Austin, TX 78746 | Oil & Gas Operator | Sep 2013 |