| 201 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 202 | Royal Production Company, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Jun 2026 |
| 203 | Rse, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2000 |
| 204 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 205 | Sabco Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2011 |
| 206 | Sabco Operating Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2018 |
| 207 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 208 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 209 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 210 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 211 | Scoggins Oil & Gas Co. | Seabrook, TX 77586 | Oil & Gas Operator | Jun 2000 |
| 212 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 213 | Sentry Exploration, Inc. | Houston, TX 77006 | Oil & Gas Operator | Jun 2026 |
| 214 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 215 | Sierra Minerals, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jun 2026 |
| 216 | Silverbrook Operating II LLC | Barker, TX 77413 | Oil & Gas Operator | Jun 2026 |
| 217 | Silverbrook Operating, LLC | Barker, TX 77413 | Oil & Gas Operator | Jun 2026 |
| 218 | Sonterra Operating, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jun 2026 |
| 219 | South Bay Resources, L.L.C. | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2026 |
| 220 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 221 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 222 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 223 | Stanotex, LLC | Katy, TX 77494 | Oil & Gas Operator | Jun 2026 |
| 224 | Sterling Expl. & Prod. Co., LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 225 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 226 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 227 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Jun 2026 |
| 228 | Sure Flow Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Mar 2008 |
| 229 | Sutton Producing Corp. | San Antonio, TX 78270 | Oil & Gas Operator | Jun 2026 |
| 230 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 231 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |
| 232 | Taos Resources Operating Co LLC | Houston, TX 77037 | Oil & Gas Operator | Dec 2019 |
| 233 | Te-Ray Resources, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Mar 2015 |
| 234 | Teamco Operating LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2002 |
| 235 | Teton Petroleum Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jun 2026 |
| 236 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Jun 2026 |
| 237 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Jun 2026 |
| 238 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Jun 2026 |
| 239 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 240 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 241 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 242 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 243 | Torrent Oil LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 244 | Tower Resources Inc | Conroe, TX 77304 | Oil & Gas Operator | Jun 2026 |
| 245 | TR Offshore, LLC | Corpus Christ, TX 78413 | Oil & Gas Operator | Jun 2026 |
| 246 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 247 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 248 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 249 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Jun 2026 |
| 250 | Trinidad Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2026 |
| 251 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 252 | Tschoepe, Arthur J. | Leakey, TX 78873 | Oil & Gas Operator | Jun 2001 |
| 253 | TX Petroleum Company | Corpus Christ, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 254 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 255 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 256 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 257 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jun 2026 |
| 258 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 259 | Victoria Operating, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Jun 2026 |
| 260 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 261 | Vintage Petroleum, LLC | Houston, TX 77210 | Oil & Gas Operator | Dec 2019 |
| 262 | Virlar Exploration, Inc. | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 263 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 264 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 265 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 266 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 267 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 268 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Jun 2026 |
| 269 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 270 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Jun 2026 |
| 271 | Wofford, C. J. | El Campo, TX 77437 | Oil & Gas Operator | Jun 2026 |
| 272 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 273 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 274 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 275 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |