| 201 | Power Reserves, Inc. | | Oil Operator | Feb 1999 |
| 202 | Prayer Oil & Gas Production, LLC | Hallsville, TX 75650 | Oil & Gas Operator | Apr 2025 |
| 203 | Precision Holdings, LLC | | Oil & Gas Operator | Dec 2015 |
| 204 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 205 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 206 | Prospective Investment & Trding Co LTD | | Oil & Gas Operator | Sep 2012 |
| 207 | Quest Exploration L.L.C. | | Oil & Gas Operator | Jul 2014 |
| 208 | Quinoco Petroleum Inc | | Oil & Gas Operator | Dec 1990 |
| 209 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 210 | Reb Petroleum Company | Sugar Land, TX 77478 | Oil & Gas Operator | Apr 2025 |
| 211 | Red Willow Offshore, LLC | | Oil & Gas Operator | Apr 2011 |
| 212 | Reef Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2007 |
| 213 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Apr 2025 |
| 214 | Rig Iron Petroleum Inc | | Oil & Gas Operator | Aug 1988 |
| 215 | Rockbridge Oil & Gas | Houston, TX 77027 | Oil & Gas Operator | Mar 1990 |
| 216 | Rosewood Resources (Poc), Inc. | | Oil & Gas Operator | Dec 1984 |
| 217 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 218 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 219 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 220 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 221 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 222 | Santana Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 223 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 224 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 225 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 226 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 227 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2025 |
| 228 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 229 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 230 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 231 | Southwest Oil Properties, Inc. | | Oil & Gas Operator | Feb 1996 |
| 232 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 233 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2025 |
| 234 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 235 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 236 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 237 | State Energy & Investment Inc. | | Oil & Gas Operator | Mar 1990 |
| 238 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 239 | Tabco Producing Co. | | Oil & Gas Operator | Jan 1998 |
| 240 | Tammany Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 241 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 242 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 243 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 244 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 245 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 246 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 247 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 248 | Texas Gas Transmission LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 249 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 250 | The Dow Chemical Company | | Oil & Gas Operator | Dec 1997 |
| 251 | The Southern Louisiana Expl. Company LLC | | Oil & Gas Operator | Nov 2024 |
| 252 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 253 | The Superior Oil Co & Pel-Tex | | Oil & Gas Operator | Apr 1986 |
| 254 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Feb 2025 |
| 255 | Tiger Petroleum | | Oil Operator | Sep 2002 |
| 256 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 257 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 258 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 259 | Traver Oil Company | | Oil & Gas Operator | Sep 2000 |
| 260 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 261 | Trigon Exploration, Inc. | | Oil & Gas Operator | Jan 1999 |
| 262 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 263 | TXP Operating Company | | Oil & Gas Operator | Jul 1992 |
| 264 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 265 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 266 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 267 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 268 | Vernon E. Faulconer | | Oil & Gas Operator | Dec 1996 |
| 269 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 270 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Jan 2025 |
| 271 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 272 | Warwick Oil Corp. | | Oil & Gas Operator | Mar 1990 |
| 273 | Weaver Exploration Company | | Oil & Gas Operator | Jun 1991 |
| 274 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Apr 2025 |
| 275 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Apr 2025 |
| 276 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 277 | Wintershall Corporation | | Oil & Gas Operator | Oct 1989 |
| 278 | Wintershall Oil & Gas Corp | Houston, TX 77027 | Oil & Gas Operator | Jul 1989 |
| 279 | Wle, Inc. | | Oil & Gas Operator | Feb 2012 |
| 280 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 281 | Yuma Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2002 |