| 6301 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 6302 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 6303 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 6304 | Leicht, Cecil | Streetman, TX 75859 | Oil & Gas Operator | Feb 1998 |
| 6305 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 6306 | Leighty, Roger Operator | Lawrenceville, IL 62439 | Oil & Gas Operator | Oct 1997 |
| 6307 | Lejan, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 6308 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 6309 | Lemay Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Jun 2002 |
| 6310 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Jan 2025 |
| 6311 | Lemon, Richard F. Jr. | Carrollton, TX 75006 | Oil & Gas Operator | Oct 2025 |
| 6312 | Lenert & Pettitt, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 1994 |
| 6313 | Lennon Oil Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2008 |
| 6314 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2025 |
| 6315 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | Oct 2025 |
| 6316 | Leonard, Patricia Anne | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1996 |
| 6317 | Leopard, Glenn | Malakoff, TX 75148 | Oil & Gas Operator | Aug 2003 |
| 6318 | Leor Energy Indigo L.P. | Houston, TX 77079 | Gas Operator | Oct 2017 |
| 6319 | Lep Development Company, LLC | Houston, TX 77007 | Oil & Gas Operator | Jul 2020 |
| 6320 | Lera | Borger, TX 79007 | Oil & Gas Operator | Oct 2025 |
| 6321 | Leroy Oil Co. | Gainesville, TX 76240 | Oil & Gas Operator | Jun 2002 |
| 6322 | Lesikar, L. W. | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2006 |
| 6323 | Letwin & Kallison | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2004 |
| 6324 | Lety Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2002 |
| 6325 | Levant Energy LLC | Milton, MA 02186 | Oil Operator | Oct 2025 |
| 6326 | Levee Oil LLC | Tuscola, TX 79562 | Oil Operator | Oct 2025 |
| 6327 | Levens, C. H. | Water Valley, TX 76958 | Oil & Gas Operator | May 2010 |
| 6328 | Leverage Operating, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Dec 2021 |
| 6329 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 6330 | Levisay Operating Co. | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2025 |
| 6331 | Lewis & Hays | Albany, TX 76430 | Oil & Gas Operator | Feb 2002 |
| 6332 | Lewis Heirs 480, LLC | Bryson, TX 76427 | Oil & Gas Operator | Oct 2025 |
| 6333 | Lewis Oil And Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 6334 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2025 |
| 6335 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 6336 | Lewis Petro Properties, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 6337 | Lewis, James B. Land & Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Nov 1998 |
| 6338 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 6339 | Lewis, T. K. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Oct 2025 |
| 6340 | Lewis, William T. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 6341 | Lex And Lace Petroleum, LLC | Houston, TX 77269 | Oil Operator | Oct 2025 |
| 6342 | Lexgas, Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Oct 2025 |
| 6343 | Lexus Gas Corporation | Roanoke, TX 76262 | Oil & Gas Operator | Jul 2005 |
| 6344 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 6345 | Libertad Operating LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 6346 | Liberty Head Petroleum, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Sep 2017 |
| 6347 | Liberty National Corp | Dallas, TX 75206 | Oil Operator | Dec 2006 |
| 6348 | Liberty Operating Company, Inc. | Lake Dallas, TX 75065 | Oil & Gas Operator | Mar 2008 |
| 6349 | Liberty Production Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 6350 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 6351 | Libom Oil Company | Elmsford, NY 10523 | Oil & Gas Operator | Aug 2003 |
| 6352 | Lif-Tex Oil Recovery, Inc. | Luling, TX 78648 | Oil Operator | Oct 2025 |
| 6353 | Light Resources | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2013 |
| 6354 | Lighthouse Exploration, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 2007 |
| 6355 | Lighthouse Operating, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2021 |
| 6356 | Lightning Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 6357 | Likover Oil Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2005 |
| 6358 | Lilley, C.C., Inc. | Dallardsville, TX 77332 | Oil & Gas Operator | Oct 2025 |
| 6359 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 6360 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 6361 | Lime Creek Enterprises | Aztec, NM 87410 | Oil & Gas Operator | Aug 2008 |
| 6362 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 6363 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 6364 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 6365 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 6366 | Limestone Exploration II, LLC | Midland, TX 79704 | Oil & Gas Operator | Jun 2019 |
| 6367 | Limestone Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2011 |
| 6368 | Limestone Oil & Gas Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2002 |
| 6369 | Limited Resources | Perryton, TX 79070 | Oil & Gas Operator | Aug 2003 |
| 6370 | Linan Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 6371 | Linc Gulf Coast Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2025 |
| 6372 | Linco Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Oct 2025 |
| 6373 | Lincoln Energy Partners, LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 6374 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 6375 | Lindemann, James D. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 6376 | Lindemann, Robert Operating | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 6377 | Lindemann, W. L., DRLG. Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1994 |
| 6378 | Lindemann, W.L., Oper. Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2006 |
| 6379 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 6380 | Lindenmuth & Associates, Etex | Austin, TX 78703 | Oil & Gas Operator | Jun 2002 |
| 6381 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Oct 2025 |
| 6382 | Linder, John G. Jr. | Gladewater, TX 75647 | Oil & Gas Operator | Apr 2005 |
| 6383 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | Oct 2025 |
| 6384 | Lindholm Oil, Inc. | Mathis, TX 78368 | Gas Operator | Sep 2002 |
| 6385 | Lindley, J. R. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2002 |
| 6386 | Lindow Oil & Gas, LLC | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2025 |
| 6387 | Lindsay Oil Operations | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2010 |
| 6388 | Lindsay, Dick | Graham, TX 76450 | Oil & Gas Operator | May 2015 |
| 6389 | Lindsay, Robert L. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1995 |
| 6390 | Line Energy LLC | Columbus, NE 68601 | Oil Operator | Apr 2025 |
| 6391 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 6392 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 6393 | Linop Corporation | Austin, TX 78728 | Oil & Gas Operator | Oct 2025 |
| 6394 | Lion Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 6395 | Lionheart Energy Corporation | Durango, CO 81301 | Oil & Gas Operator | Oct 2025 |
| 6396 | Lions Den Operating LLC | Carthage, TX 75633 | Gas Operator | Oct 2025 |
| 6397 | Lipan Flats Production, L.L.C. | San Angelo, TX 76905 | Oil Operator | Oct 2025 |
| 6398 | Liquid Petroleum Resources, Inc. | Amarillo, TX 79120 | Gas Operator | Oct 2025 |
| 6399 | Lissner, Lindy | Jourdanton, TX 78026 | Oil & Gas Operator | Oct 2025 |
| 6400 | Litchfield Production Co. | Nederland, TX 77627 | Oil & Gas Operator | Oct 2025 |