| 401 | Larson Drilling Corp. | Jamestown, NY 14702 | Gas Operator | Dec 2023 |
| 402 | Larson Exploration Company | Tulsa, OK 74136-4939 | Oil & Gas Operator | Jul 2016 |
| 403 | Larson Operating | | Oil & Gas Operator | Mar 2001 |
| 404 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 405 | Larson, Perry L Operating Co Inc | Dallas, TX 75382 | Oil & Gas Operator | Feb 2021 |
| 406 | Las Animas Production Company | Midland, TX 79705 | Oil & Gas Operator | Mar 1995 |
| 407 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 408 | Las Palmas Petroleum Corp. | | Oil Operator | Dec 2010 |
| 409 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 410 | Lasalle Marine Corporation | Houston, TX 77056 | Oil Operator | Aug 2003 |
| 411 | Lasater & Co, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 412 | Lasco Production Co | | Oil & Gas Operator | Dec 1999 |
| 413 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 414 | Lashley Oil Company Inc | Walters, OK 73572 | Oil Operator | Dec 2014 |
| 415 | Lasmo Energy Cor | | Oil Operator | Feb 1990 |
| 416 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 417 | Lassetter Petrol | | Oil Operator | Oct 1986 |
| 418 | Lasso Energy LLC | Chase, KS 67524 | Oil & Gas Operator | Dec 2024 |
| 419 | Lasso Oil & Gas LLC | | Oil & Gas Operator | Jul 2022 |
| 420 | Last Chance Operating LLC | Wortham, TX 76693 | Oil Operator | Apr 2025 |
| 421 | Last Ditch Petroleum LLC | Edmonton, KY 42129 | Oil Operator | Dec 2023 |
| 422 | Last Dollar LLC | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2025 |
| 423 | Last Mile Production, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 424 | Last Run, LLC | Rillito, AZ 85246 | Oil & Gas Operator | May 2020 |
| 425 | Laster Welding And Well Serv, Inc. | | Gas Operator | Jul 2020 |
| 426 | Lastrada Oil And Gas LTD | | Oil & Gas Operator | May 1992 |
| 427 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 428 | Latexo Oil & Gas Co. | | Oil Operator | Sep 1986 |
| 429 | Latexo Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Feb 1997 |
| 430 | Latham & Bonner | | Oil Operator | Aug 1987 |
| 431 | Latham Exploration Company Inc | | Oil & Gas Operator | Aug 1992 |
| 432 | Latham Production & Service Co | | Oil Operator | Jul 1989 |
| 433 | Latham Roger P C | Dallas, TX 75244 | Oil Operator | Apr 2015 |
| 434 | Latham, Bonner & Hall | | Oil Operator | Mar 1988 |
| 435 | Latham, Richard K | Lewisburg, KY 42256 | Oil Operator | Dec 2022 |
| 436 | Latigo (Texas), LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 437 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | Feb 2025 |
| 438 | Latigo Oil And Gas Inc | Woodward, OK 73801 | Oil & Gas Operator | Feb 2025 |
| 439 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 440 | Latigo Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2025 |
| 441 | Latigo Petroleum, LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 442 | Latimer, D. Gail Enterprises,Inc | Snyder, TX 79550 | Oil & Gas Operator | Jul 2004 |
| 443 | Lauber Floyd | Dayton, OH 45415 | Oil & Gas Operator | Dec 1997 |
| 444 | Lauck & Associates | Walnut Creek, CA 91789 | Oil & Gas Operator | Jan 2025 |
| 445 | Lauck D R Oil Co | | Oil & Gas Operator | Oct 1995 |
| 446 | Laughlin Jack D | Cushing, OK 74023 | Oil & Gas Operator | Sep 2016 |
| 447 | Laughlin, W. M. Estate | Premont, TX 78375 | Oil & Gas Operator | Jun 2003 |
| 448 | Laurel Fuel Company | Jackson, MS 39206 | Oil & Gas Operator | Dec 1996 |
| 449 | Laurel Mountain Production | Pittsburgh, PA 15241-1633 | Oil & Gas Operator | Feb 2025 |
| 450 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Jan 2025 |
| 451 | Laurence C Kelly | Farmington, NM 87402 | Gas Operator | Dec 2002 |
| 452 | Lavaca Canyon Petroleum LLC | Houston, TX 77094 | Oil & Gas Operator | Apr 2025 |
| 453 | Lavaca River Operating Co., LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Apr 2025 |
| 454 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 455 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 456 | Laverty, Thomas R | | Oil & Gas Operator | Dec 2023 |
| 457 | Lavino Oil And Gas Company | | Oil & Gas Operator | Aug 1989 |
| 458 | Lavrco Energie Inc | Duncan, OK 73533 | Oil & Gas Operator | Oct 2024 |
| 459 | Law E Edward | Newkirk, OK 74647-2056 | Oil Operator | Dec 2024 |
| 460 | Law Production, Inc. | McPherson, KS 67460 | Oil Operator | Nov 2007 |
| 461 | Lawbanco Drillin | | Oil Operator | Feb 1995 |
| 462 | Lawbanco Drilling, Inc. | Natoma, KS 67651 | Oil Operator | May 1998 |
| 463 | Lawbar Petroleum, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Aug 2003 |
| 464 | Lawco Exploration Inc | Bentonville, AR 72712 | Oil & Gas Operator | Aug 2024 |
| 465 | Lawco Holdings LLC | Bentonville, AR 72712 | Oil Operator | Jan 2025 |
| 466 | Lawco Osage Operating, LLC | Bentonville, AR 72712 | Oil & Gas Operator | Apr 2025 |
| 467 | Lawlis Oil Company | Hamlin, TX 79520 | Oil & Gas Operator | Apr 2025 |
| 468 | Lawrence & Bush | Lawton, OK 73507 | Oil Operator | Dec 1995 |
| 469 | Lawrence & Bush, Inc. | Pampa, TX 79065 | Oil Operator | Oct 1998 |
| 470 | Lawrence County Gas LLC | Salyersville, KY 41465 | Oil & Gas Operator | Dec 2023 |
| 471 | Lawrence Energy Company | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 472 | Lawrence Exploration Inc | | Oil & Gas Operator | Sep 2004 |
| 473 | Lawrence Hot Oil Service | Loco, OK 73442 | Oil & Gas Operator | Feb 2025 |
| 474 | Lawrence James LLC | Guthrie, OK 73044-9622 | Oil & Gas Operator | Feb 2025 |
| 475 | Lawrence James Oil Prop Inc | Catoosa, OK 74015 | Oil & Gas Operator | Feb 2012 |
| 476 | Lawrence Larry O | | Gas Operator | Sep 1993 |
| 477 | Lawrence Roy Drilling Co Inc | Pawnee, OK 74058-0306 | Oil & Gas Operator | Aug 2000 |
| 478 | Lawrence Smith Oil LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2022 |
| 479 | Lawrence W Ritter | Farmington, NM 87499 | Gas Operator | Feb 2025 |
| 480 | Lawrence, C. F. & Assoc. Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Apr 2025 |
| 481 | Lawrence, Max | Cambridge, KS 67023 | Oil Operator | Dec 2024 |
| 482 | Laws Exploration LLC | Mineral Wells, TX 76067 | Oil Operator | Apr 2025 |
| 483 | Lawson Arthur C | | Oil Operator | Aug 1994 |
| 484 | Lawson Engineering, Inc. | | Oil & Gas Operator | Dec 1984 |
| 485 | Lawson George E | Sand Springs, OK 74063 | Oil & Gas Operator | May 2013 |
| 486 | Lawson Oil Company | Buckeye, AR 85326 | Oil Operator | Mar 1996 |
| 487 | Lawson Operating LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2015 |
| 488 | Lawson Petroleum Co. | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2009 |
| 489 | Lawson, A.C., Inc. | Derby, KS 67037 | Oil Operator | Dec 2024 |
| 490 | Lawson, Thelma | Geuda Springs, KS 67051 | Oil Operator | Dec 2009 |
| 491 | Lawton, Jack Inc. | Sulphur, LA 70663 | Oil & Gas Operator | Dec 1995 |
| 492 | Lax, Inc. | | Oil & Gas Operator | Nov 1987 |
| 493 | Lay, J. D. | Lockhart, TX 78644 | Oil & Gas Operator | May 1997 |
| 494 | Lay, Warren Leon | Lockhart, TX 78644 | Oil & Gas Operator | Aug 2023 |
| 495 | Layco Oil | Okmulgee, OK 74447-2065 | Oil & Gas Operator | Apr 2020 |
| 496 | Layline Energy I LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2019 |
| 497 | Layline Oil And Gas LLC | Marion, MI 49665 | Oil & Gas Operator | Jan 2025 |
| 498 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 499 | Laymac Corporation | | Gas Operator | Dec 2020 |
| 500 | Laymon Oil Compa | | Oil & Gas Operator | Dec 1996 |