| 201 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 202 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 203 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 204 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 205 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 206 | National Onshore LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 207 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Mar 2025 |
| 208 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | Mar 2025 |
| 209 | Nicor Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 210 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 211 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 212 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Mar 2025 |
| 213 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 214 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Mar 2025 |
| 215 | North Operating Company | Canton, TX 75103 | Oil & Gas Operator | Mar 2025 |
| 216 | Noxxe Oil And Gas, LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 217 | O&G Investments Inc. | Runge, TX 78151 | Oil & Gas Operator | Feb 2003 |
| 218 | O'Sand Production, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Aug 2003 |
| 219 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 220 | Orion Oil And Gas Corporation | Houston, TX 77082 | Oil & Gas Operator | Mar 2025 |
| 221 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 222 | Osyka Producing Company, Inc. | Houston, TX 77242 | Oil & Gas Operator | Mar 2025 |
| 223 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 224 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Mar 2025 |
| 225 | Packard Gas Company | Irving, TX 75063 | Oil & Gas Operator | Nov 2006 |
| 226 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 227 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 228 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 229 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 230 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 231 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2025 |
| 232 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 233 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Mar 2025 |
| 234 | Petrosaurus, Inc. | Somerset, TX 78069 | Oil Operator | Mar 2025 |
| 235 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 236 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 237 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 238 | Plains Marketing, LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 239 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 240 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 241 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 242 | Poco LLC | Houston, TX 77270 | Oil & Gas Operator | Mar 2025 |
| 243 | Polaris Enterprises Inc | Houston, TX 77057 | Oil & Gas Operator | Oct 1998 |
| 244 | Poynor Corporation | Beaumont, TX 77706 | Oil & Gas Operator | Mar 2025 |
| 245 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 246 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Mar 2025 |
| 247 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 248 | Prolithic Energy Company, L.P. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2002 |
| 249 | Promise Energy Operations, LLC | Texas City, TX 77592 | Oil Operator | Mar 2025 |
| 250 | Puls, W. L. | Houston, TX 77084 | Oil & Gas Operator | Sep 2002 |
| 251 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 252 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 253 | Redbird Oilfield Services Corp. | Splendora, TX 77372 | Oil & Gas Operator | Mar 2025 |
| 254 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 255 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2025 |
| 256 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Mar 2025 |
| 257 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 258 | Ricochet Energy, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Mar 2025 |
| 259 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 260 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Mar 2025 |
| 261 | Rockbridge Oil And Gas, Inc. | Houston, TX 77227 | Oil & Gas Operator | Nov 1997 |
| 262 | Rockwell Energy, LLC | Spring, TX 77386 | Oil & Gas Operator | Sep 2014 |
| 263 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 264 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 265 | Roy Production Co. | Shamrock, TX 79079 | Oil & Gas Operator | Jul 2012 |
| 266 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 267 | S & S Energy | Englewood, CO 80112 | Oil & Gas Operator | Mar 2015 |
| 268 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 269 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Jan 2025 |
| 270 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 271 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 272 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 273 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 274 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 275 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 276 | Sandpoint Texas LLC | Houston, TX 77270 | Oil Operator | Mar 2025 |
| 277 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 278 | Sawtooth Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 279 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | Mar 2025 |
| 280 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 281 | Secondary Gas Recovery Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1993 |
| 282 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 283 | Service Production Company, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | May 1999 |
| 284 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 285 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 286 | Sideline Oil & Gas, L.P. | Friendswood, TX 77549 | Oil Operator | Mar 2025 |
| 287 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 288 | Smith Energy 1986a Partnership | Alvin, TX 77511 | Oil & Gas Operator | Feb 2010 |
| 289 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 290 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | Mar 2025 |
| 291 | Sonterra Oil & Gas, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Mar 2025 |
| 292 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 293 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 294 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 295 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 296 | Standard Resources Corp. | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 297 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 298 | Stealth Onsite Solutions LLC | Pasadena, TX 77505 | Oil Operator | Mar 2025 |
| 299 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2025 |
| 300 | Stratco Operating Co., Inc. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |