| 201 | Opal Energy, Inc. | Katy, TX 77494 | Oil & Gas Operator | Jun 2009 |
| 202 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 203 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 204 | Overton Park Oil & Gas LP | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 205 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 206 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 207 | Pace Oil And Gas Company | Austin, TX 78715 | Oil & Gas Operator | Dec 2025 |
| 208 | Paladin Petroleum III, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 209 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Dec 2025 |
| 210 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 211 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 212 | Pearl, Bill H. Productions, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 2025 |
| 213 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 214 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 215 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 216 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | May 2025 |
| 217 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 218 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 219 | Petroleum Capital, L.C. | Dallas, TX 75367 | Oil & Gas Operator | Dec 2025 |
| 220 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 221 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 222 | Plo'S Oil & Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Dec 2025 |
| 223 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2025 |
| 224 | Praxis Energy, LLC | Midland, TX 79705 | Oil Operator | Apr 2002 |
| 225 | Premier Natural Resources, L.P. | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2007 |
| 226 | Premier Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 227 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 228 | Pyle Petroleum | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Dec 1996 |
| 229 | Pyle Petroleum, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Apr 2025 |
| 230 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 231 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 232 | Reh Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Dec 2025 |
| 233 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2025 |
| 234 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Oct 2025 |
| 235 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Dec 2025 |
| 236 | Roma Oil And Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 237 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 238 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 239 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Dec 2025 |
| 240 | Royko Oil Company | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 241 | Rumble Energy LLC | Skiatook, OK 74070 | Oil & Gas Operator | Dec 2025 |
| 242 | Sable Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Nov 1999 |
| 243 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Dec 2025 |
| 244 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2025 |
| 245 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 246 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 247 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 248 | Santa Rosa Operating, LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Dec 2025 |
| 249 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 250 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Dec 2025 |
| 251 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 252 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 253 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Dec 2025 |
| 254 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2025 |
| 255 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 256 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 257 | South Leeville, LLC | Houston, TX 77069 | Oil & Gas Operator | Oct 2022 |
| 258 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 259 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 260 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 261 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 262 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Dec 2025 |
| 263 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 264 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 265 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 266 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |
| 267 | Tallgrass Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 268 | Talon Development Company | Boerne, TX 78006 | Oil & Gas Operator | Sep 2007 |
| 269 | TCRG Drilling & Operating, LLC | Fort Worth, TX 76107 | Oil Operator | Dec 2025 |
| 270 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 271 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 272 | Tejas Petroleum Resources, LLC | Aubrey, TX 76227 | Oil & Gas Operator | Dec 2025 |
| 273 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 274 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 275 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 276 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Dec 2025 |
| 277 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 278 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 279 | Texron Operating, LLC | Bulverde, TX 78163 | Oil & Gas Operator | Dec 2025 |
| 280 | Third Coast Energy, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Dec 2025 |
| 281 | TNT Petroleum Company, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Feb 1996 |
| 282 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 283 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 284 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 285 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Dec 2025 |
| 286 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 287 | United Oil & Minerals L. P. | Austin, TX 78746 | Oil & Gas Operator | Jun 2003 |
| 288 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 289 | United Resources LP | Austin, TX 78746 | Oil & Gas Operator | Oct 2011 |
| 290 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 291 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 292 | Vantage Point Operating Co. | Houston, TX 77057 | Oil & Gas Operator | Dec 2014 |
| 293 | Vaquero Operating | FT Stockton, TX 79735 | Oil & Gas Operator | Dec 2025 |
| 294 | Varas Energy Operating Company, LLC | Houston, TX 77005 | Oil & Gas Operator | Dec 2025 |
| 295 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Sep 2025 |
| 296 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 297 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 298 | Vintage Petroleum, LLC | Houston, TX 77210 | Oil & Gas Operator | Dec 2019 |
| 299 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 300 | Wadi Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |