| 201 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 202 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 203 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 204 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 205 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 206 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |
| 207 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2025 |
| 208 | Inspire Oil And Gas Inc. | Katy, TX 77449 | Oil & Gas Operator | Apr 2025 |
| 209 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Apr 2025 |
| 210 | J G Oil & Gas | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 211 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 212 | Joe Kestner, L.L.C. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Feb 2016 |
| 213 | Johnson Resources, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Oct 2011 |
| 214 | JTB Oil Company, Inc. | Refugio, TX 78377 | Oil & Gas Operator | Apr 2025 |
| 215 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 216 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 217 | Kemco Oil | Alice, TX 78332 | Oil & Gas Operator | Aug 2009 |
| 218 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 219 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 220 | Kibbe, Anna S. | Falfurrias, TX 78355 | Oil & Gas Operator | Sep 1998 |
| 221 | Kidd Production Co. | Luling, TX 78648 | Oil & Gas Operator | Apr 2025 |
| 222 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 223 | Kindee Oil & Gas Texas, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2016 |
| 224 | Kingwood Resources, Inc. | Kingwood, TX 77339 | Oil & Gas Operator | May 2022 |
| 225 | Kriken Oil & Gas | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Jul 2005 |
| 226 | L & F Drilling Co., Inc. (1) | Corpus Chrsti, TX 78479 | Oil & Gas Operator | Apr 2025 |
| 227 | L.T.D. Explorations Inc. | Alice, TX 78333 | Oil & Gas Operator | Apr 2025 |
| 228 | La Parrita Oil & Gas, Inc. | Rosenberg, TX 77471 | Oil & Gas Operator | May 2002 |
| 229 | Lagarto Company, The | Fredericksbrg, TX 78624 | Oil & Gas Operator | Apr 1995 |
| 230 | Lamay Corporation | Rosenberg, TX 77471 | Oil & Gas Operator | Apr 2025 |
| 231 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Apr 2025 |
| 232 | Laughlin, W. M. Estate | Premont, TX 78375 | Oil & Gas Operator | Jun 2003 |
| 233 | Left Behind Recovery, LLC | Luling, TX 78648 | Oil & Gas Operator | Apr 2025 |
| 234 | Legacy Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 235 | Lighthouse Exploration, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 2007 |
| 236 | Lighthouse Operating, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2021 |
| 237 | Lindholm Oil, Inc. | Mathis, TX 78368 | Gas Operator | Sep 2002 |
| 238 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 239 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 240 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 241 | Live Oak Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Apr 2025 |
| 242 | Live Oak/Operations, Inc. | Houston, TX 77019 | Gas Operator | Jul 2011 |
| 243 | Logas Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Apr 2025 |
| 244 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Apr 2025 |
| 245 | LTX Productions, Inc. | Houston, TX 77095 | Oil & Gas Operator | Jul 2008 |
| 246 | Lucros International Corporation | Van Buren, AR 72956 | Oil & Gas Operator | Apr 2025 |
| 247 | Lundberg Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Oct 2002 |
| 248 | Luttrell, T. Bruce Oil & Gas Opr | Freer, TX 78357 | Oil & Gas Operator | Mar 2008 |
| 249 | Lynd, J. L., Inc. | Austin, TX 78716 | Oil & Gas Operator | Sep 2009 |
| 250 | M. J. G., Inc. | Alice, TX 78333 | Oil & Gas Operator | Jul 2010 |
| 251 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 252 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 253 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 254 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Apr 2025 |
| 255 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 256 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Apr 2025 |
| 257 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Apr 2025 |
| 258 | McGuffin, Joe S. Inc. | Mathis, TX 78368 | Gas Operator | Apr 2025 |
| 259 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 260 | MGM Well Service, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2004 |
| 261 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 262 | Midas Resources, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2025 |
| 263 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 264 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 265 | Miller, M. M. & Sons | Alice, TX 78333 | Oil & Gas Operator | Apr 2007 |
| 266 | Miller, W. C. Operating Company | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 267 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Apr 2025 |
| 268 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 269 | ML Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 270 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 271 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 272 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Apr 2025 |
| 273 | Mogul Energy International, Inc. | Houston, TX 77042 | Oil & Gas Operator | Oct 2017 |
| 274 | Moose Oil & Gas Co. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 275 | Moose Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Apr 2025 |
| 276 | MPG Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 277 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 278 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 279 | Munson, Charles C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2002 |
| 280 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 281 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Apr 2025 |
| 282 | New Horizon Investments LTD. | George West, TX 78022 | Oil & Gas Operator | Apr 2025 |
| 283 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 284 | Newgulf Petroleum, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2017 |
| 285 | Newman Operating Company | Freer, TX 78357 | Oil & Gas Operator | Jun 2021 |
| 286 | Newman, John A. | Joplin, MO 64804 | Oil & Gas Operator | Jan 2001 |
| 287 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 288 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 289 | Nordan Trust, The | San Antonio, TX 78205 | Oil & Gas Operator | Nov 2003 |
| 290 | Norgas Energy | Lakehills, TX 78063 | Oil & Gas Operator | Apr 2025 |
| 291 | North Central Oil Corp. | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 292 | Nueces Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Oct 2002 |
| 293 | Null, W.M. Operations, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Jun 2002 |
| 294 | Nye Exploration & Prod, L.L.C. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 295 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 296 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 297 | Omega Energy, LLC | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Apr 2025 |
| 298 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Apr 2025 |
| 299 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Apr 2025 |
| 300 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |