| 401 | Alagood & Alagood | | Oil & Gas Operator | May 1981 |
| 402 | Alameda Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 1994 |
| 403 | Alameda Oil Company | | Oil Operator | Mar 1998 |
| 404 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 405 | Alamo Permian Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2016 |
| 406 | Alamo Petroleum Company | | Oil & Gas Operator | Jun 1985 |
| 407 | Alamo Resources Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 408 | Alamosa Drilling Inc | Dallas, TX 75206-1841 | Oil & Gas Operator | Jan 2024 |
| 409 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 410 | Alan Howard Karchmer Living Trust | | Oil Operator | Dec 2022 |
| 411 | Alanmar Energy | | Gas Operator | Jan 2018 |
| 412 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2024 |
| 413 | Alaska Development Company | | Oil Operator | Dec 1933 |
| 414 | Alb, Inc. | Great Bend, KS 67530 | Oil Operator | Dec 2023 |
| 415 | Albany Well Service | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 416 | Albemarle Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Feb 2024 |
| 417 | Albert E. Smith Oil | | Oil Operator | Dec 2023 |
| 418 | Albert R. Braun Oil Operations, LLC (Estate) | Hays, KS 67601 | Oil Operator | Dec 2023 |
| 419 | Albert Thornbrough Trust | Boca Raton, FL 33432 | Gas Operator | Dec 2023 |
| 420 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 421 | Albert-Bishop Exploration Co Inc | Dallas, TX 75240 | Oil & Gas Operator | Feb 2007 |
| 422 | Alberta Gas Company | Vernal, UT 84078 | Oil & Gas Operator | Nov 2021 |
| 423 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 424 | Albright Paul D Or Inger J | Okemah, OK 74859-9309 | Oil & Gas Operator | Dec 2023 |
| 425 | Albritton Resources Inc | Dallas, TX 75206 | Oil & Gas Operator | Feb 2001 |
| 426 | Alchemist Energy, LLC | Irving, TX 75062 | Oil & Gas Operator | Apr 2024 |
| 427 | Alchemy Farms LLC | Hamburg, NY 14075 | Gas Operator | Dec 2022 |
| 428 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Apr 2024 |
| 429 | Alco Ind | Valley Forge, PA 19482-0937 | Gas Operator | Dec 2023 |
| 430 | Alco Oil & Gas | Lafayette, LA 70130 | Oil & Gas Operator | Dec 1970 |
| 431 | Alco Oil & Gas Co. LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 432 | Alcon H2oil LLC | Pecos, TX 79772 | Oil & Gas Operator | Apr 2024 |
| 433 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Apr 2024 |
| 434 | Alcorn Energy, L.L.C. | Woodway, TX 76712 | Oil Operator | Apr 2024 |
| 435 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 436 | Alcorn, Jerry D. | Grand Prairie, TX 75050 | Oil & Gas Operator | Apr 2024 |
| 437 | Alcove Investments | Apollo, PA 15613-9720 | Oil & Gas Operator | Dec 2023 |
| 438 | Alda Oil & Gas Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2004 |
| 439 | Alden Aurora Gas Company, Inc. | Alden, NY 14004 | Gas Operator | Dec 2022 |
| 440 | Alden Central School District | Alden, NY 14004 | Gas Operator | Dec 2022 |
| 441 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Apr 2024 |
| 442 | Aldinger, Naomi R. | Alden, NY 14004 | Gas Operator | Dec 2022 |
| 443 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 444 | Aleco Production Company | | Oil & Gas Operator | Nov 1997 |
| 445 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 446 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 447 | Aleo Oil Company, LLC | Great Bend, KS 67530 | Oil Operator | Dec 2023 |
| 448 | Alex Oil Co. | | Oil Operator | Jun 1996 |
| 449 | Alexander Brothers Oil | | Oil Operator | Jan 1999 |
| 450 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 451 | Alexander Oil Company | Loco, OK 73442-9409 | Oil & Gas Operator | Dec 2023 |
| 452 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 453 | Alexander Production Service | | Oil & Gas Operator | Dec 2009 |
| 454 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 455 | Alexander Royalty Company | Red Rock, TX 78662 | Oil Operator | Apr 2024 |
| 456 | Alexander, Gary M. | Peru, KS 67360 | Oil Operator | Aug 2023 |
| 457 | Alexander, Herbert R. Inc. | Houma, LA 70360 | Oil & Gas Operator | Jun 1998 |
| 458 | Alexander, Howard | Tulsa, OK 74114 | Oil & Gas Operator | Feb 1996 |
| 459 | Alexander, Jesse R. | McPherson, KS 67460 | Oil Operator | Aug 2010 |
| 460 | Alexander, John | Pearland, TX 77588 | Oil & Gas Operator | Apr 2024 |
| 461 | Alexander, Stanley | Electra, TX 76360 | Oil & Gas Operator | May 2016 |
| 462 | Alexander, Thomas M | | Oil Operator | Mar 2015 |
| 463 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 464 | Alexandria Oil, Inc. | | Oil Operator | Dec 1991 |
| 465 | Alfaro Oil & Gas | Burkburnett, TX 76354 | Oil & Gas Operator | Apr 2024 |
| 466 | Alfaro Production LLC | Burkburnett, TX 76354 | Oil Operator | Apr 2024 |
| 467 | Alford Oil Corporation | Spring, TX 77379 | Oil & Gas Operator | May 2006 |
| 468 | Alford Paul | Ada, OK 74820 | Oil Operator | Jan 2020 |
| 469 | Alfred C. Glassell, Jr. | | Oil & Gas Operator | Apr 2007 |
| 470 | Alfred Lamson-James A. Crocker | | Oil & Gas Operator | Sep 1986 |
| 471 | Alfred, Dewayne L | Weston, WV 26542-0478 | Oil & Gas Operator | Dec 1996 |
| 472 | Algoa Operating Company, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2002 |
| 473 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 474 | Alice-Sidney Oil Co LTD PRTSHP | | Oil & Gas Operator | Mar 2020 |
| 475 | Alinet Corporation | | Oil & Gas Operator | Aug 2013 |
| 476 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 477 | All Exploration LLC | Oklahoma City, OK 73120-7829 | Oil & Gas Operator | Dec 2023 |
| 478 | All In Energy Production, LLP | Red Rock, TX 78662 | Oil Operator | Apr 2024 |
| 479 | All Saints Lutheran Church | Hamburg, NY 14075 | Gas Operator | Dec 2022 |
| 480 | All States Oil & Producing Co Inc | Canton, OH 44702 | Oil & Gas Operator | Dec 2018 |
| 481 | Allam Carl Oil C | | Oil Operator | Mar 1986 |
| 482 | Allam Kevin T Oi | | Oil Operator | Jun 1988 |
| 483 | Allam Production, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | Dec 2023 |
| 484 | Allam WM Robt Jr | | Oil Operator | Aug 1993 |
| 485 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 486 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 487 | Allegany Energy, Inc. | Belmont, NY 14813 | Oil & Gas Operator | Dec 2022 |
| 488 | Allegheny Enterprises Inc | Corsica, PA 15829-3833 | Oil & Gas Operator | Dec 2018 |
| 489 | Allegheny Natural Resources Inc | Gibsonia, PA 15044-8055 | Gas Operator | Dec 2019 |
| 490 | Allegheny Producers Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1984 |
| 491 | Allegiance Operating Inc. | Wichita Falls, TX 76307 | Oil Operator | Apr 2024 |
| 492 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2024 |
| 493 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 494 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 495 | Allen & Allen Oil Co | | Oil Operator | Jan 2024 |
| 496 | Allen & Grace Oil Company | Kingsbury, TX 78638 | Oil & Gas Operator | Jul 1997 |
| 497 | Allen & Shumate, Inc. | Alice, TX 78333 | Oil & Gas Operator | Jan 1996 |
| 498 | Allen And Crouch | Casper, WY 82602 | Oil & Gas Operator | Mar 2020 |
| 499 | Allen And Schramm Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 500 | Allen Benne | Ramona, OK 74061-3612 | Oil Operator | Aug 2010 |