| 201 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 202 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 203 | Last Chance Operating LLC | Wortham, TX 76693 | Oil Operator | May 2025 |
| 204 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 205 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 206 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | May 2025 |
| 207 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 208 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 209 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 210 | London Petroleum Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 211 | Lorac, Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 212 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | May 2025 |
| 213 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | May 2025 |
| 214 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 215 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 216 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 217 | Marconi Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 218 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 219 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 220 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | May 2025 |
| 221 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 222 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 223 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 224 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 225 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | May 2025 |
| 226 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 227 | Means Oil Company, LLC | Corsicana, TX 75110 | Oil & Gas Operator | May 2025 |
| 228 | Means, Frank L. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2001 |
| 229 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Mar 2025 |
| 230 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 231 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 232 | Millennium Exploration Co. LLC | San Antonio, TX 78232 | Oil & Gas Operator | May 2025 |
| 233 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 234 | Miller, B. H. Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Sep 2002 |
| 235 | Miller, R. A. Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 236 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | May 2025 |
| 237 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 238 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 239 | Mitsui E&P USA LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 240 | ML Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 241 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 242 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 243 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 244 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 245 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 246 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Aug 2024 |
| 247 | Nacogdoches Oil & Gas Inc | Nacogdoches, TX 75963 | Oil & Gas Operator | May 2025 |
| 248 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | May 2025 |
| 249 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | May 2025 |
| 250 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 251 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 252 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | May 2025 |
| 253 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 254 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | May 2025 |
| 255 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 256 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 257 | Old Union Operating Company | Austin, TX 78716 | Oil & Gas Operator | May 2025 |
| 258 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 259 | Omega Energy, LLC | Corpus Chrsti, TX 78418 | Oil & Gas Operator | May 2025 |
| 260 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 261 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 262 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 263 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 264 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 265 | Parten Operating Inc. | Houston, TX 77069 | Oil & Gas Operator | May 2025 |
| 266 | Patara Andover I LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 267 | Patara Oil & Gas LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2018 |
| 268 | Peak Operating Of Texas, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 269 | Pecos Petroleum Company | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 270 | Pedernales Petroleum Op, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 271 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 272 | Perryman Operating Company | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 273 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 274 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 275 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 276 | Petroleum Investments, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Dec 1977 |
| 277 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | May 2025 |
| 278 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 279 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 280 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 281 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 282 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | May 2025 |
| 283 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 284 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 285 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 286 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | May 2025 |
| 287 | Precision Operating Inc. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2014 |
| 288 | Pringle Resources, Inc. | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 289 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | May 2025 |
| 290 | Psi Production, Inc. | Tyler, TX 75702 | Gas Operator | Jan 1994 |
| 291 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 292 | PXP Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2007 |
| 293 | Quality Operating, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Aug 2002 |
| 294 | Quanico Oil & Gas, Inc. | El Dorado, AR 71730 | Oil & Gas Operator | May 2025 |
| 295 | Quantum Oil & Gas Corporation | Oklahoma City, OK 73172 | Oil & Gas Operator | May 2025 |
| 296 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2025 |
| 297 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 298 | R. Lacy Services, LTD. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 299 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 300 | Red Willow Production, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2015 |