| 401 | Akins Oil Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2025 |
| 402 | Akma, Inc. | Ore City, TX 75683 | Oil & Gas Operator | Apr 1999 |
| 403 | Akron Central School District | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 404 | Akron Oil Corp | Hackensack, NJ 07602 | Oil & Gas Operator | Dec 1989 |
| 405 | Aksarben Petroleum, Inc. | | Oil Operator | Sep 2022 |
| 406 | Al & D.L. Chiles | | Oil & Gas Operator | Jul 1991 |
| 407 | Al Chiles II | | Oil Operator | Jan 2025 |
| 408 | Al Merit Energy Co., Inc. | | Oil & Gas Operator | Jun 2015 |
| 409 | Al-La-Lyn Oil, Inc. | Ellis, KS 67637 | Oil Operator | Nov 2003 |
| 410 | Alabama Energy Group, Inc. | | Oil & Gas Operator | Aug 1986 |
| 411 | Alacia Operating Company | Freer, TX 78357 | Oil & Gas Operator | Jul 2025 |
| 412 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 413 | Aladdin Petroleu | | Oil & Gas Operator | Nov 1995 |
| 414 | Aladdin Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2021 |
| 415 | Alagood & Alagood | | Oil & Gas Operator | May 1981 |
| 416 | Alameda Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 1994 |
| 417 | Alameda Oil Company | | Oil Operator | Mar 1998 |
| 418 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 419 | Alamo Permian Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2016 |
| 420 | Alamo Petroleum Company | | Oil & Gas Operator | Jun 1985 |
| 421 | Alamo Resources Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 422 | Alamosa Drilling Inc | Dallas, TX 75206-1841 | Oil & Gas Operator | Apr 2024 |
| 423 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 424 | Alan Energy Coinc The/Ofb | | Gas Operator | Aug 1991 |
| 425 | Alan Gable Oil Development Company | | Oil & Gas Operator | Dec 2021 |
| 426 | Alan Howard Karchmer Living Trust | | Oil Operator | Dec 2022 |
| 427 | Alanmar Energy | | Gas Operator | Jan 2018 |
| 428 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Jul 2025 |
| 429 | Alaska Development Company | | Oil Operator | Dec 1933 |
| 430 | Alb, Inc. | Great Bend, KS 67530 | Oil Operator | Mar 2025 |
| 431 | Albany Well Service | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 432 | Albemarle Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 433 | Albert E. Smith Oil | | Oil Operator | May 2025 |
| 434 | Albert R. Braun Oil Operations, LLC (Estate) | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 435 | Albert Thornbrough Trust | Boca Raton, FL 33432 | Gas Operator | Mar 2025 |
| 436 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 437 | Albert-Bishop Exploration Co Inc | Dallas, TX 75240 | Oil & Gas Operator | Feb 2007 |
| 438 | Alberta Gas Company | Vernal, UT 84078 | Oil & Gas Operator | Nov 2021 |
| 439 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 440 | Albright Paul D Or Inger J | Okemah, OK 74859-9309 | Oil & Gas Operator | Feb 2025 |
| 441 | Albritton Resources Inc | Dallas, TX 75206 | Oil & Gas Operator | Feb 2001 |
| 442 | Alchemist Energy, LLC | Irving, TX 75062 | Oil & Gas Operator | Jul 2025 |
| 443 | Alchemy Farms LLC | Hamburg, NY 14075 | Gas Operator | Dec 2024 |
| 444 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Jul 2025 |
| 445 | Alco Ind | Valley Forge, PA 19482-0937 | Gas Operator | Dec 2024 |
| 446 | Alco Oil & Gas | Lafayette, LA 70130 | Oil & Gas Operator | Dec 1970 |
| 447 | Alco Oil & Gas Co. LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 2025 |
| 448 | Alcon H2oil LLC | Pecos, TX 79772 | Oil & Gas Operator | Jul 2025 |
| 449 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Jul 2025 |
| 450 | Alcorn Energy, L.L.C. | Woodway, TX 76712 | Oil Operator | Jul 2025 |
| 451 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 452 | Alcorn, Jerry D. | Grand Prairie, TX 75050 | Oil & Gas Operator | Jul 2025 |
| 453 | Alcove Investments | Apollo, PA 15613-9720 | Oil & Gas Operator | Dec 2024 |
| 454 | Alda Oil & Gas Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2004 |
| 455 | Alden Aurora Gas Company, Inc. | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 456 | Alden Central School District | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 457 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Jul 2025 |
| 458 | Aldinger, Naomi R. | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 459 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 460 | Aleco Production Company | | Oil & Gas Operator | Nov 1997 |
| 461 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 462 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2025 |
| 463 | Aleo Oil Company, LLC | Great Bend, KS 67530 | Oil Operator | Mar 2025 |
| 464 | Alex Oil Co. | | Oil Operator | Jun 1996 |
| 465 | Alexander Brothers Oil | | Oil Operator | Jan 1999 |
| 466 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 467 | Alexander Oil Co. | Loco, OK 73442-9409 | Oil & Gas Operator | Jun 2025 |
| 468 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 469 | Alexander Production Service | | Oil & Gas Operator | Dec 2009 |
| 470 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 471 | Alexander, Gary M. | Peru, KS 67360 | Oil Operator | Mar 2025 |
| 472 | Alexander, Herbert R. Inc. | Houma, LA 70360 | Oil & Gas Operator | Jun 1998 |
| 473 | Alexander, Howard | Tulsa, OK 74114 | Oil & Gas Operator | Feb 1996 |
| 474 | Alexander, Jesse R. | McPherson, KS 67460 | Oil Operator | Aug 2010 |
| 475 | Alexander, John | Pearland, TX 77588 | Oil & Gas Operator | Jul 2025 |
| 476 | Alexander, Milt M | | Oil Operator | Mar 2015 |
| 477 | Alexander, Stanley | Electra, TX 76360 | Oil & Gas Operator | May 2016 |
| 478 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 479 | Alexandria Oil, Inc. | | Oil Operator | Dec 1991 |
| 480 | Alfaro Oil & Gas | Burkburnett, TX 76354 | Oil & Gas Operator | Jul 2025 |
| 481 | Alfaro Production LLC | Burkburnett, TX 76354 | Oil Operator | Jul 2025 |
| 482 | Alford Oil Corporation | Spring, TX 77379 | Oil & Gas Operator | May 2006 |
| 483 | Alford Paul | Ada, OK 74820 | Oil Operator | Jan 2020 |
| 484 | Alfred C. Glassell, Jr. | | Oil & Gas Operator | Apr 2007 |
| 485 | Alfred Lamson-James A. Crocker | | Oil & Gas Operator | Sep 1986 |
| 486 | Alfred, Dewayne L | Weston, WV 26542-0478 | Oil & Gas Operator | Dec 1996 |
| 487 | Algoa Operating Company, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2002 |
| 488 | Alice & Andrew & George Hazer | Girard, PA 16417-9801 | Gas Operator | Dec 2024 |
| 489 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 490 | Alice-Sidney Oil Co LTD PRTSHP | | Oil & Gas Operator | Mar 2020 |
| 491 | Alinet Corporation | | Oil & Gas Operator | Aug 2013 |
| 492 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 493 | All Exploration LLC | Oklahoma City, OK 73120-7829 | Oil & Gas Operator | Apr 2025 |
| 494 | All In Energy Production Corp. | Red Rock, TX 78662 | Oil Operator | Jul 2025 |
| 495 | All States Oil & Producing Co Inc | Canton, OH 44702 | Oil & Gas Operator | Dec 2018 |
| 496 | All-Southwest Petroleum, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Oct 1997 |
| 497 | Allam Carl Oil C | | Oil Operator | Mar 1986 |
| 498 | Allam Kevin T Oi | | Oil Operator | Jun 1988 |
| 499 | Allam Production, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | Mar 2025 |
| 500 | Allam WM Robt Jr | | Oil Operator | Aug 1993 |