| 401 | Lone Star Services | Pecos, TX 79772 | Oil & Gas Operator | Jul 2025 |
| 402 | Lone Tree Oil & Gas LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Jul 2025 |
| 403 | Lone Wolf Operating Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2005 |
| 404 | Lone Wolf Operating Company, LP | Haxtun, CO 80731 | Oil & Gas Operator | Sep 2009 |
| 405 | Lonesome B, LLC | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 406 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 407 | Lonestar Production Services | Graham, TX 76450 | Oil Operator | Jul 2025 |
| 408 | Long Branch Production, LLC | Buna, TX 77612 | Gas Operator | Sep 2024 |
| 409 | Long Operating, L.L.C. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2006 |
| 410 | Long Petroleum, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2020 |
| 411 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 412 | Long, Edgar E. | Windthorst, TX 76389 | Oil & Gas Operator | Oct 2011 |
| 413 | Long, Larry T. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2017 |
| 414 | Long-Tex Exploration, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Jul 2025 |
| 415 | Longbotham Energy, LLC | Jackson, TN 38308 | Oil Operator | Jul 2025 |
| 416 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 417 | Longhorn Mineral Corporation | Bellaire, TX 77401 | Oil & Gas Operator | May 2018 |
| 418 | Longhorn Oil Properties, Inc. | Pottsboro, TX 75076 | Oil & Gas Operator | Jul 2025 |
| 419 | Longhorn Service & Drilling Co. | Kermit, TX 79745 | Oil & Gas Operator | Jun 2019 |
| 420 | Longshot Energy LLC | League City, TX 77573 | Oil Operator | Jul 2025 |
| 421 | Longview Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2002 |
| 422 | Lorac, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 423 | Lorentz Oil & Gas LLC | Edmond, OK 73034-7266 | Oil & Gas Operator | Apr 2025 |
| 424 | Lorenz & Bosanko | San Antonio, TX 78247 | Oil & Gas Operator | Jul 2025 |
| 425 | Lorenz, J. P., Jr. | La Vernia, TX 78121 | Oil & Gas Operator | Mar 2008 |
| 426 | Lorlan Oil Company | Wink, TX 79789 | Oil & Gas Operator | Aug 2020 |
| 427 | Losure Pet. Co. | Borger, TX 79008 | Oil & Gas Operator | Apr 2014 |
| 428 | Losure, Ken | Borger, TX 79008 | Oil & Gas Operator | Jul 2025 |
| 429 | Lotex Exploration & Prod. Co. | Carrollton, TX 75006 | Oil & Gas Operator | Jul 2011 |
| 430 | Lothian Oil Texas I, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 431 | Lott Production Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 432 | Lottie Oil Co. | Seguin, TX 78156 | Oil & Gas Operator | Apr 1996 |
| 433 | Lotus O&G, LLC | Mansfield, TX 76063 | Oil Operator | Jul 2025 |
| 434 | Loudel, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 435 | Loudon Exploration, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2008 |
| 436 | Loudon Operating Company, L.L.C. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 437 | Louisiana Energy Consultant Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 438 | Louisiana Jordan Oil Co, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Dec 2024 |
| 439 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 440 | Louisiana Minerals, LTD. | Houston, TX 77024 | Oil & Gas Operator | Jul 1988 |
| 441 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 442 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 443 | Loveless Properties | Burkburnett, TX 76354 | Oil & Gas Operator | Apr 2021 |
| 444 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Jul 2025 |
| 445 | Lowe, Dean | Albany, TX 76430 | Oil Operator | Jul 2025 |
| 446 | Lower Colorado River Authority | Bastrop, TX 78602 | Oil & Gas Operator | Jul 2025 |
| 447 | Lowrance & Ray Exploration, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Sep 2003 |
| 448 | Lowrance Inc. | Eastland, TX 76448 | Oil & Gas Operator | Jul 2025 |
| 449 | Lowrance, Gene | Chico, TX 76431 | Oil & Gas Operator | Aug 2003 |
| 450 | Lozano Oil Company Inc. | Houston, TX 77082 | Oil & Gas Operator | Jul 2025 |
| 451 | LP Operating, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 452 | LP Robinson Holdings, L.L.C. | Abilene, TX 79608 | Oil Operator | Jul 2025 |
| 453 | Lpes, Inc. | Provo, UT 84604 | Oil & Gas Operator | Nov 2018 |
| 454 | LPR Energy, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jul 2025 |
| 455 | LR Energy, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 456 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 457 | LRR Pecos Valley, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 458 | LSM Ventures, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2020 |
| 459 | LT Oil Company | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 460 | LT Oil LLC | San Marcos, TX 78666 | Oil Operator | Jul 2025 |
| 461 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Jul 2025 |
| 462 | LTS Oil & Gas A | Lubbock, TX 79424 | Oil & Gas Operator | Jul 2025 |
| 463 | LTX Productions, Inc. | Houston, TX 77095 | Oil & Gas Operator | Jul 2008 |
| 464 | Lubbock Energy, Inc. | Lubbock, TX 79453 | Oil & Gas Operator | Oct 1996 |
| 465 | Luca Resources Group, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 466 | Lucas Energy, Inc. | Houston, TX 77067 | Oil & Gas Operator | Feb 2017 |
| 467 | Lucky Bird Too | Borger, TX 79008 | Oil & Gas Operator | Jul 2025 |
| 468 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Jul 2025 |
| 469 | Lucky Oil & Gas | Malibu, CA 90265 | Oil & Gas Operator | Jul 2025 |
| 470 | Luconda Oil | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 471 | Lucros International Corporation | Van Buren, AR 72956 | Oil & Gas Operator | Jul 2025 |
| 472 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | May 2025 |
| 473 | Lufkin Production Company Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 2025 |
| 474 | Luke, D.L. Oil Co. | Burkburnett, TX 76354 | Oil & Gas Operator | Jul 2025 |
| 475 | Luke, W. J. | Muenster, TX 76252 | Oil & Gas Operator | Mar 2013 |
| 476 | Luling O&G LLC | Cibolo, TX 78108 | Oil & Gas Operator | Jul 2025 |
| 477 | Luling Oil & Gas Co Inc | San Antonio, TX 78209 | Oil Operator | Dec 1986 |
| 478 | Luling Well Service | Luling, TX 78648 | Oil & Gas Operator | Jul 2025 |
| 479 | Luloc Oil Co. | Lockhart, TX 78644 | Oil & Gas Operator | Aug 2003 |
| 480 | Lumbley, W. F. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2008 |
| 481 | Lunar Oil Company | Midland, TX 79708 | Oil & Gas Operator | Feb 1999 |
| 482 | Lundberg Oil Co. | Dallas, TX 75360 | Oil & Gas Operator | Jan 2003 |
| 483 | Lundberg Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Oct 2002 |
| 484 | Lundells, Inc. | Freer, TX 78357 | Oil & Gas Operator | Jan 1995 |
| 485 | Lundy, Richard C. | Pampa, TX 79066 | Oil & Gas Operator | Aug 1997 |
| 486 | Lunn, Will | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 1997 |
| 487 | Lusk Nominee Trust | Houston, TX 77098 | Oil & Gas Operator | Jul 2019 |
| 488 | Lutex Oil, LTD. | Luling, TX 78648 | Oil & Gas Operator | Sep 2024 |
| 489 | Luttrell, T. Bruce Oil & Gas Opr | Freer, TX 78357 | Oil & Gas Operator | Mar 2008 |
| 490 | Lutz And Boyd | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 491 | Luvwell Holdings | Tyler, TX 75701 | Oil Operator | Jul 2025 |
| 492 | Luxe Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2021 |
| 493 | Luxor Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 494 | LX4, LLC | Laverne, OK 73848 | Oil Operator | May 2025 |
| 495 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 496 | Lyn-San Company | Midland, TX 79708 | Oil & Gas Operator | Dec 2018 |
| 497 | Lynbrook Oil Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2008 |
| 498 | Lynch, W. W. | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2006 |
| 499 | Lynch, W. Waldo | Uvalde, TX 78801 | Oil & Gas Operator | Jan 1996 |
| 500 | Lynch, Wilbur Waldo, Estate Of | New Braunfels, TX 78130 | Oil & Gas Operator | Oct 2017 |