| 601 | Alaska Development Company | | Oil Operator | Dec 1933 |
| 602 | Alb, Inc. | Great Bend, KS 67530 | Oil Operator | Sep 2025 |
| 603 | Albany Well Service | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 604 | Albemarle Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 605 | Albert E. Smith Oil | | Oil Operator | Dec 2025 |
| 606 | Albert R. Braun Oil Operations, LLC (Estate) | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 607 | Albert Thornbrough Trust | Boca Raton, FL 33432 | Gas Operator | Sep 2025 |
| 608 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 609 | Albert-Bishop Exploration Co Inc | Dallas, TX 75240 | Oil & Gas Operator | Feb 2007 |
| 610 | Alberta Gas Company | Vernal, UT 84078 | Oil & Gas Operator | Nov 2021 |
| 611 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 612 | Albright Paul D Or Inger J | Okemah, OK 74859-9309 | Oil & Gas Operator | Nov 2025 |
| 613 | Albritton Resources Inc | Dallas, TX 75206 | Oil & Gas Operator | Feb 2001 |
| 614 | Alchemist Energy, LLC | Irving, TX 75062 | Oil & Gas Operator | Feb 2026 |
| 615 | Alchemy Farms LLC | Hamburg, NY 14075 | Gas Operator | Dec 2024 |
| 616 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Feb 2026 |
| 617 | Alco Ind | Valley Forge, PA 19482-0937 | Gas Operator | Dec 2024 |
| 618 | Alco Oil & Gas | Lafayette, LA 70130 | Oil & Gas Operator | Dec 1970 |
| 619 | Alco Oil & Gas Co. LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 620 | Alcon H2oil LLC | Pecos, TX 79772 | Oil & Gas Operator | Feb 2026 |
| 621 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Feb 2026 |
| 622 | Alcorn Energy, L.L.C. | Woodway, TX 76712 | Oil Operator | Feb 2026 |
| 623 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 624 | Alcorn, Jerry D. | Grand Prairie, TX 75050 | Oil & Gas Operator | Feb 2026 |
| 625 | Alcove Investments | Apollo, PA 15613-9720 | Oil & Gas Operator | Dec 2025 |
| 626 | Alda Oil & Gas Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2004 |
| 627 | Alden Aurora Gas Company, Inc. | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 628 | Alden Central School District | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 629 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Feb 2026 |
| 630 | Aldinger, Naomi R. | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 631 | Aldrich Gary | Ponca City, OK 74602-2674 | Oil & Gas Operator | Aug 2011 |
| 632 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 633 | Aleco Production Company | | Oil & Gas Operator | Nov 1997 |
| 634 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 635 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 636 | Alegre Operating, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2026 |
| 637 | Aleo Oil Company, LLC | Great Bend, KS 67530 | Oil Operator | Sep 2025 |
| 638 | Alert Oil & Gas Co, Inc | | Gas Operator | Dec 2006 |
| 639 | Alex N Campbell | Farmington, NM 87499 | Oil & Gas Operator | Aug 1994 |
| 640 | Alex Oil Co. | | Oil Operator | Jun 1996 |
| 641 | Alexander Brothers Oil | | Oil Operator | Jan 1999 |
| 642 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 643 | Alexander Howard | Tulsa, OK 74114 | Oil & Gas Operator | Feb 1996 |
| 644 | Alexander Oil Company | Loco, OK 73442-9409 | Oil & Gas Operator | Dec 2025 |
| 645 | Alexander Pet. Consultants Inc | | Oil & Gas Operator | May 1990 |
| 646 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 647 | Alexander Production Service | | Oil & Gas Operator | Dec 2009 |
| 648 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 649 | Alexander Royalty Company | Red Rock, TX 78662 | Oil Operator | Feb 2026 |
| 650 | Alexander, Gary M. | Peru, KS 67360 | Oil Operator | Mar 2025 |
| 651 | Alexander, Herbert R. Inc. | Houma, LA 70360 | Oil & Gas Operator | Jun 1998 |
| 652 | Alexander, Jesse R. | McPherson, KS 67460 | Oil Operator | Aug 2010 |
| 653 | Alexander, John | Pearland, TX 77588 | Oil & Gas Operator | Feb 2026 |
| 654 | Alexander, Milt M | | Oil Operator | Mar 2015 |
| 655 | Alexander, Stanley | Electra, TX 76360 | Oil & Gas Operator | May 2016 |
| 656 | Alexander, W. B. | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 657 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 658 | Alexandria Oil, Inc. | | Oil Operator | Dec 1991 |
| 659 | Alfaro Oil & Gas | Burkburnett, TX 76354 | Oil & Gas Operator | Feb 2026 |
| 660 | Alfaro Production LLC | Burkburnett, TX 76354 | Oil Operator | Feb 2026 |
| 661 | Alford Oil Corporation | Spring, TX 77379 | Oil & Gas Operator | May 2006 |
| 662 | Alford Paul | Ada, OK 74820 | Oil Operator | Jan 2020 |
| 663 | Alfred C. Glassell, Jr. | | Oil & Gas Operator | Apr 2007 |
| 664 | Alfred Lamson-James A. Crocker | | Oil & Gas Operator | Sep 1986 |
| 665 | Alfred, Dewayne L | Weston, WV 26542-0478 | Oil & Gas Operator | Dec 1996 |
| 666 | Algoa Operating Company, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2002 |
| 667 | Alice & Andrew & George Hazer | Girard, PA 16417-9801 | Gas Operator | Dec 2025 |
| 668 | Alice E & Charles L Valone | North East, PA 16428-3055 | Oil & Gas Operator | Dec 2004 |
| 669 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 670 | Alice-Sidney Oil Co LTD PRTSHP | | Oil & Gas Operator | Mar 2020 |
| 671 | Alinet Corporation | | Oil & Gas Operator | Aug 2013 |
| 672 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 673 | All Exploration LLC | Oklahoma City, OK 73120-7829 | Oil & Gas Operator | Nov 2025 |
| 674 | All Oil & Gas Inc. | | Oil & Gas Operator | Jul 1989 |
| 675 | All Saints Lutheran Church | Hamburg, NY 14075 | Gas Operator | Dec 2024 |
| 676 | All States Oil & Producing Co Inc | Canton, OH 44702 | Oil & Gas Operator | Dec 2018 |
| 677 | All-Southwest Petroleum, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Oct 1997 |
| 678 | Allam Carl Oil C | | Oil Operator | Mar 1986 |
| 679 | Allam Kevin T Oi | | Oil Operator | Jun 1988 |
| 680 | Allam Production, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | Sep 2025 |
| 681 | Allam WM Robt Jr | | Oil Operator | Aug 1993 |
| 682 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 683 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 684 | Allegany Energy, Inc. | Belmont, NY 14813 | Oil & Gas Operator | Dec 2024 |
| 685 | Allegheny Enterprises Inc | Corsica, PA 15829-3833 | Oil & Gas Operator | Dec 2018 |
| 686 | Allegheny Natural Resources Inc | Gibsonia, PA 15044-8055 | Gas Operator | Dec 2019 |
| 687 | Allegheny Producers Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1984 |
| 688 | Allegiance Operating Inc. | Wichita Falls, TX 76307 | Oil Operator | Feb 2026 |
| 689 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Feb 2026 |
| 690 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 691 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 692 | Allen & Allen Oil Co | | Oil Operator | Nov 2025 |
| 693 | Allen & Grace Oil Company | Kingsbury, TX 78638 | Oil & Gas Operator | Jul 1997 |
| 694 | Allen & Shumate, Inc. | Alice, TX 78333 | Oil & Gas Operator | Jan 1996 |
| 695 | Allen And Crouch | Casper, WY 82602 | Oil & Gas Operator | Mar 2020 |
| 696 | Allen And Schramm Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 697 | Allen Benne | Ramona, OK 74061-3612 | Oil Operator | Aug 2010 |
| 698 | Allen Brothers | | Oil & Gas Operator | Dec 2024 |
| 699 | Allen Brothers Company | Oil City, LA 71061 | Oil & Gas Operator | Apr 1997 |
| 700 | Allen Delmar | Okemah, OK 74859-9801 | Oil & Gas Operator | Dec 2000 |