| 201 | Maggert Energy Corp. | Spring, TX 77387 | Gas Operator | Jun 1998 |
| 202 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 203 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 204 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 205 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Mar 2025 |
| 206 | Maran Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2020 |
| 207 | Maran Oil Company, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2022 |
| 208 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 209 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 210 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 211 | McCarter, W. B. Jr. | Houston, TX 77063 | Oil & Gas Operator | Feb 2002 |
| 212 | McDonald & Johnson Resources,LLC | Cypress, TX 77429 | Oil & Gas Operator | Dec 2010 |
| 213 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 214 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 215 | Mellon Oil Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 216 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 217 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 218 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 219 | Millennium Exploration Co. LLC | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2025 |
| 220 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2025 |
| 221 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Mar 2025 |
| 222 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 223 | MPG Petroleum | San Antonio, TX 78217 | Oil & Gas Operator | Aug 2003 |
| 224 | MPG Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 225 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 226 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 227 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Mar 2025 |
| 228 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 229 | Nordan & Company | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2004 |
| 230 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 231 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 232 | O'Connor Energy Management, LLC | Victoria, TX 77902 | Oil Operator | Mar 2025 |
| 233 | Odegard Energy, Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2020 |
| 234 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 235 | Opal Energy, Inc. | Katy, TX 77494 | Oil & Gas Operator | Jun 2009 |
| 236 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 237 | Pace Oil And Gas Company | Austin, TX 78715 | Oil & Gas Operator | Mar 2025 |
| 238 | Pace Production Co. | San Angelo, TX 76902 | Oil & Gas Operator | Mar 2025 |
| 239 | Pace West Production LC | San Angelo, TX 76904 | Oil & Gas Operator | Sep 1995 |
| 240 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Mar 2025 |
| 241 | Paloma Operating, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 242 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 243 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 244 | Payne, B.R. Oil & Gas, Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 2006 |
| 245 | Pearl, Bill H. Productions, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Mar 2025 |
| 246 | Pedeco, Inc. | Casper, WY 82601 | Oil & Gas Operator | Mar 2008 |
| 247 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 248 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 249 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Mar 2025 |
| 250 | Pintex Operating Inc. | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2005 |
| 251 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 252 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 253 | Pool Operating Corporation | Lago VIsta, TX 78645 | Oil & Gas Operator | Oct 2016 |
| 254 | Premier Minerals, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 255 | Prevail Energy, Inc | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Mar 2025 |
| 256 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 257 | Pullin Lease Service, Inc. | Taft, TX 78390 | Oil & Gas Operator | Mar 2025 |
| 258 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 259 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 260 | Remora Management, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Mar 2025 |
| 261 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 262 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Mar 2025 |
| 263 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Mar 2025 |
| 264 | Ricochet Energy, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Mar 2025 |
| 265 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 266 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Mar 2025 |
| 267 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Mar 2025 |
| 268 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 269 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Mar 2025 |
| 270 | San Isidro Development Co, L. C. | Sandia, TX 78383 | Oil & Gas Operator | Mar 2025 |
| 271 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 272 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 273 | Sandalwood Oil & Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 274 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 275 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 276 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Mar 2025 |
| 277 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 278 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 279 | Shefts & Shefts, Inc. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 280 | Shoreham Oil & Gas Company, Inc. | Katy, TX 77492 | Oil & Gas Operator | Mar 2025 |
| 281 | Shubuta Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Sep 1998 |
| 282 | Simray Oil & Gas, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2003 |
| 283 | Simray Operating Corp. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2009 |
| 284 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 285 | Slack Oil & Gas | Refugio, TX 78377 | Oil & Gas Operator | Dec 2012 |
| 286 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 287 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 288 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 289 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |
| 290 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Mar 2025 |
| 291 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 292 | Summit Resources MGMT., LLC. | Edmond, OK 73083 | Oil & Gas Operator | Mar 2025 |
| 293 | Suncoast Technical Services Inc | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 294 | Sure Flow Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Mar 2008 |
| 295 | Sure Flow Oil & Gas, Inc. | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 296 | T - C Oil Company | Refugio, TX 78377 | Oil & Gas Operator | Jan 2012 |
| 297 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Mar 2025 |
| 298 | Tal-Con, Inc. | Houston, TX 77279 | Oil & Gas Operator | Mar 2025 |
| 299 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Mar 2025 |
| 300 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |