| 201 | Lee Production Co. | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 202 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 203 | Leejan Oil Company | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2025 |
| 204 | Leeper Oil Exp. & Prod. Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2005 |
| 205 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 206 | Leexus Oil LLC | Giddings, TX 78942 | Oil & Gas Operator | Dec 2025 |
| 207 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 208 | Leffel'S, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2020 |
| 209 | Lefforge & Klein | Amarillo, TX 79114 | Gas Operator | Jun 1997 |
| 210 | Left Behind Recovery, LLC | Luling, TX 78648 | Oil & Gas Operator | Dec 2025 |
| 211 | Legacy Corporation, The | Cedar Park, TX 78613 | Oil & Gas Operator | Jun 2004 |
| 212 | Legacy Energy Services | Jourdanton, TX 78026 | Oil Operator | Dec 2025 |
| 213 | Legacy Exploration, LLC I | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 214 | Legacy Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Dec 2025 |
| 215 | Legacy Operating Company, LLC | Dallas, TX 75205 | Oil Operator | Jun 2024 |
| 216 | Legacy Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 2019 |
| 217 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 218 | Legado Gulf Coast, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2010 |
| 219 | Legado Midcon LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 220 | Legado Permian, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2013 |
| 221 | Legend Energy Texas, LLC | Arlington, TX 76002 | Oil & Gas Operator | Dec 2025 |
| 222 | Legend Natural Gas II, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 223 | Legend Natural Gas III, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 224 | Legend Natural Gas IV, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 225 | Legend Natural Gas, LP | Houston, TX 77084 | Oil & Gas Operator | Aug 2004 |
| 226 | Legend Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2010 |
| 227 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 228 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 229 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 230 | Leicht, Cecil | Streetman, TX 75859 | Oil & Gas Operator | Feb 1998 |
| 231 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 232 | Leighty, Roger Operator | Lawrenceville, IL 62439 | Oil & Gas Operator | Oct 1997 |
| 233 | Lejan, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 234 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 235 | Lemay Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Jun 2002 |
| 236 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Aug 2025 |
| 237 | Lemon, Richard F. Jr. | Carrollton, TX 75006 | Oil & Gas Operator | Dec 2025 |
| 238 | Lenert & Pettitt, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 1994 |
| 239 | Lennon Oil Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2008 |
| 240 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 241 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | Dec 2025 |
| 242 | Leonard, Patricia Anne | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1996 |
| 243 | Leopard, Glenn | Malakoff, TX 75148 | Oil & Gas Operator | Aug 2003 |
| 244 | Leor Energy Indigo L.P. | Houston, TX 77079 | Gas Operator | Oct 2017 |
| 245 | Lep Development Company, LLC | Houston, TX 77007 | Oil & Gas Operator | Jul 2020 |
| 246 | Lera | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 247 | Leroy Oil Co. | Gainesville, TX 76240 | Oil & Gas Operator | Jun 2002 |
| 248 | Lesikar, L. W. | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2006 |
| 249 | Letwin & Kallison | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2004 |
| 250 | Lety Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2002 |
| 251 | Levant Energy LLC | Milton, MA 02186 | Oil Operator | Dec 2025 |
| 252 | Levee Oil LLC | Tuscola, TX 79562 | Oil Operator | Dec 2025 |
| 253 | Levens, C. H. | Water Valley, TX 76958 | Oil & Gas Operator | May 2010 |
| 254 | Leverage Operating, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Dec 2021 |
| 255 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 256 | Levisay Operating Co. | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2025 |
| 257 | Lewis & Hays | Albany, TX 76430 | Oil & Gas Operator | Feb 2002 |
| 258 | Lewis Heirs 480, LLC | Bryson, TX 76427 | Oil & Gas Operator | Dec 2025 |
| 259 | Lewis Oil And Gas Inc | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 260 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Aug 2025 |
| 261 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 262 | Lewis Petro Properties, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2025 |
| 263 | Lewis, James B. Land & Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Nov 1998 |
| 264 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 265 | Lewis, T. K. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 266 | Lewis, William T. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 267 | Lex And Lace Petroleum, LLC | Houston, TX 77269 | Oil Operator | Dec 2025 |
| 268 | Lexgas, Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Dec 2025 |
| 269 | Lexus Gas Corporation | Roanoke, TX 76262 | Oil & Gas Operator | Jul 2005 |
| 270 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 271 | Libertad Operating LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 272 | Liberty Head Petroleum, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Sep 2017 |
| 273 | Liberty National Corp | Dallas, TX 75206 | Oil Operator | Dec 2006 |
| 274 | Liberty Operating Company, Inc. | Lake Dallas, TX 75065 | Oil & Gas Operator | Mar 2008 |
| 275 | Liberty Production Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 276 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 277 | Libom Oil Company | Elmsford, NY 10523 | Oil & Gas Operator | Aug 2003 |
| 278 | Lif-Tex Oil Recovery, Inc. | Luling, TX 78648 | Oil Operator | Dec 2025 |
| 279 | Light Resources | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2013 |
| 280 | Lighthouse Exploration, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 2007 |
| 281 | Lighthouse Operating, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2021 |
| 282 | Lightning Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 283 | Likover Oil Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2005 |
| 284 | Lilley, C.C., Inc. | Dallardsville, TX 77332 | Oil & Gas Operator | Dec 2025 |
| 285 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 286 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 287 | Lime Creek Enterprises | Aztec, NM 87410 | Oil & Gas Operator | Aug 2008 |
| 288 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 289 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 290 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 291 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 292 | Limestone Exploration II, LLC | Midland, TX 79704 | Oil & Gas Operator | Jun 2019 |
| 293 | Limestone Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2011 |
| 294 | Limestone Oil & Gas Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2002 |
| 295 | Limited Resources | Perryton, TX 79070 | Oil & Gas Operator | Aug 2003 |
| 296 | Linan Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 297 | Linc Gulf Coast Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Dec 2025 |
| 298 | Linco Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Dec 2025 |
| 299 | Lincoln Energy Partners, LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 300 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |