| 6401 | Legend Natural Gas, LP | Houston, TX 77084 | Oil & Gas Operator | Aug 2004 |
| 6402 | Legend Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2010 |
| 6403 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 6404 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 6405 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 6406 | Leicht, Cecil | Streetman, TX 75859 | Oil & Gas Operator | Feb 1998 |
| 6407 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 6408 | Leighty, Roger Operator | Lawrenceville, IL 62439 | Oil & Gas Operator | Oct 1997 |
| 6409 | Lejan, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 6410 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 6411 | Lemay Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Jun 2002 |
| 6412 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Aug 2025 |
| 6413 | Lemon, Richard F. Jr. | Carrollton, TX 75006 | Oil & Gas Operator | Dec 2025 |
| 6414 | Lenert & Pettitt, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 1994 |
| 6415 | Lennon Oil Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2008 |
| 6416 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 6417 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | Dec 2025 |
| 6418 | Leonard, Patricia Anne | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1996 |
| 6419 | Leopard, Glenn | Malakoff, TX 75148 | Oil & Gas Operator | Aug 2003 |
| 6420 | Leor Energy Indigo L.P. | Houston, TX 77079 | Gas Operator | Oct 2017 |
| 6421 | Lep Development Company, LLC | Houston, TX 77007 | Oil & Gas Operator | Jul 2020 |
| 6422 | Lera | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 6423 | Leroy Oil Co. | Gainesville, TX 76240 | Oil & Gas Operator | Jun 2002 |
| 6424 | Lesikar, L. W. | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2006 |
| 6425 | Letwin & Kallison | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2004 |
| 6426 | Lety Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2002 |
| 6427 | Levant Energy LLC | Milton, MA 02186 | Oil Operator | Dec 2025 |
| 6428 | Levee Oil LLC | Tuscola, TX 79562 | Oil Operator | Dec 2025 |
| 6429 | Levens, C. H. | Water Valley, TX 76958 | Oil & Gas Operator | May 2010 |
| 6430 | Leverage Operating, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Dec 2021 |
| 6431 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 6432 | Levisay Operating Co. | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2025 |
| 6433 | Lewis & Hays | Albany, TX 76430 | Oil & Gas Operator | Feb 2002 |
| 6434 | Lewis Heirs 480, LLC | Bryson, TX 76427 | Oil & Gas Operator | Dec 2025 |
| 6435 | Lewis Oil And Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 6436 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 6437 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 6438 | Lewis Petro Properties, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2025 |
| 6439 | Lewis, James B. Land & Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Nov 1998 |
| 6440 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 6441 | Lewis, T. K. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 6442 | Lewis, William T. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 6443 | Lewis, William T. Oil & Gas Expl | Graham, TX 76450 | Gas Operator | Jun 2014 |
| 6444 | Lex And Lace Petroleum, LLC | Houston, TX 77269 | Oil Operator | Dec 2025 |
| 6445 | Lexgas, Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Dec 2025 |
| 6446 | Lexus Gas Corporation | Roanoke, TX 76262 | Oil & Gas Operator | Jul 2005 |
| 6447 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 6448 | Libertad Operating LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 6449 | Liberty Head Petroleum, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Sep 2017 |
| 6450 | Liberty National Corp | Dallas, TX 75206 | Oil Operator | Dec 2006 |
| 6451 | Liberty Operating Company, Inc. | Lake Dallas, TX 75065 | Oil & Gas Operator | Mar 2008 |
| 6452 | Liberty Production Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 6453 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 6454 | Libom Oil Company | Elmsford, NY 10523 | Oil & Gas Operator | Aug 2003 |
| 6455 | Lif-Tex Oil Recovery, Inc. | Luling, TX 78648 | Oil Operator | Dec 2025 |
| 6456 | Light Resources | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2013 |
| 6457 | Lighthouse Exploration, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 2007 |
| 6458 | Lighthouse Operating, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2021 |
| 6459 | Lightning Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 6460 | Likover Oil Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2005 |
| 6461 | Lilley, C.C., Inc. | Dallardsville, TX 77332 | Oil & Gas Operator | Dec 2025 |
| 6462 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 6463 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 6464 | Lime Creek Enterprises | Aztec, NM 87410 | Oil & Gas Operator | Aug 2008 |
| 6465 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 6466 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 6467 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Nov 2025 |
| 6468 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 6469 | Limestone Exploration II, LLC | Midland, TX 79704 | Oil & Gas Operator | Jun 2019 |
| 6470 | Limestone Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2011 |
| 6471 | Limestone Oil & Gas Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2002 |
| 6472 | Limited Resources | Perryton, TX 79070 | Oil & Gas Operator | Aug 2003 |
| 6473 | Linan Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 6474 | Linc Gulf Coast Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Dec 2025 |
| 6475 | Linco Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Dec 2025 |
| 6476 | Lincoln Energy Partners, LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 6477 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 6478 | Lindemann, James D. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 6479 | Lindemann, Robert Operating | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 6480 | Lindemann, W. L., DRLG. Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1994 |
| 6481 | Lindemann, W.L., Oper. Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2006 |
| 6482 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 6483 | Lindenmuth & Associates, Etex | Austin, TX 78703 | Oil & Gas Operator | Jun 2002 |
| 6484 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Dec 2025 |
| 6485 | Linder, John G. Jr. | Gladewater, TX 75647 | Oil & Gas Operator | Apr 2005 |
| 6486 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | Dec 2025 |
| 6487 | Lindholm Oil, Inc. | Mathis, TX 78368 | Gas Operator | Sep 2002 |
| 6488 | Lindley, J. R. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2002 |
| 6489 | Lindow Oil & Gas, LLC | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 6490 | Lindsay Oil Operations | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2010 |
| 6491 | Lindsay, Dick | Graham, TX 76450 | Oil & Gas Operator | May 2015 |
| 6492 | Lindsay, Robert L. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1995 |
| 6493 | Line Energy LLC | Columbus, NE 68601 | Oil Operator | Apr 2025 |
| 6494 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 6495 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 6496 | Linop Corporation | Austin, TX 78728 | Oil & Gas Operator | Dec 2025 |
| 6497 | Lion Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 6498 | Lionheart Energy Corporation | Durango, CO 81301 | Oil & Gas Operator | Dec 2025 |
| 6499 | Lions Den Operating LLC | Carthage, TX 75633 | Gas Operator | Dec 2025 |
| 6500 | Lipan Flats Production, L.L.C. | San Angelo, TX 76905 | Oil Operator | Dec 2025 |