| 601 | Alco Oil & Gas | Lafayette, LA 70130 | Oil & Gas Operator | Dec 1970 |
| 602 | Alco Oil & Gas Co. LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 603 | Alcon H2oil LLC | Pecos, TX 79772 | Oil & Gas Operator | May 2025 |
| 604 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | May 2025 |
| 605 | Alcorn Energy, L.L.C. | Woodway, TX 76712 | Oil Operator | May 2025 |
| 606 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 607 | Alcorn, Jerry D. | Grand Prairie, TX 75050 | Oil & Gas Operator | May 2025 |
| 608 | Alcove Investments | Apollo, PA 15613-9720 | Oil & Gas Operator | Dec 2024 |
| 609 | Alda Oil & Gas Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2004 |
| 610 | Alden Aurora Gas Company, Inc. | Alden, NY 14004 | Gas Operator | Dec 2023 |
| 611 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | May 2025 |
| 612 | Aldinger, Naomi R. | Alden, NY 14004 | Gas Operator | Dec 2023 |
| 613 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 614 | Aleco Production Company | | Oil & Gas Operator | Nov 1997 |
| 615 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 616 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 617 | Aleo Oil Company, LLC | Great Bend, KS 67530 | Oil Operator | Jan 2025 |
| 618 | Alex Oil Co. | | Oil Operator | Jun 1996 |
| 619 | Alexander Brothers Oil | | Oil Operator | Jan 1999 |
| 620 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 621 | Alexander Oil Co. | Loco, OK 73442-9409 | Oil & Gas Operator | Mar 2025 |
| 622 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 623 | Alexander Production Service | | Oil & Gas Operator | Dec 2009 |
| 624 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 625 | Alexander Royalty Company | Red Rock, TX 78662 | Oil Operator | May 2025 |
| 626 | Alexander, Gary M. | Peru, KS 67360 | Oil Operator | Jun 2024 |
| 627 | Alexander, Herbert R. Inc. | Houma, LA 70360 | Oil & Gas Operator | Jun 1998 |
| 628 | Alexander, Howard | Tulsa, OK 74114 | Oil & Gas Operator | Feb 1996 |
| 629 | Alexander, Jesse R. | McPherson, KS 67460 | Oil Operator | Aug 2010 |
| 630 | Alexander, John | Pearland, TX 77588 | Oil & Gas Operator | May 2025 |
| 631 | Alexander, Milt M | | Oil Operator | Mar 2015 |
| 632 | Alexander, Stanley | Electra, TX 76360 | Oil & Gas Operator | May 2016 |
| 633 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 634 | Alexandria Oil, Inc. | | Oil Operator | Dec 1991 |
| 635 | Alfaro Oil & Gas | Burkburnett, TX 76354 | Oil & Gas Operator | May 2025 |
| 636 | Alfaro Production LLC | Burkburnett, TX 76354 | Oil Operator | May 2025 |
| 637 | Alford Oil Corporation | Spring, TX 77379 | Oil & Gas Operator | May 2006 |
| 638 | Alford Paul | Ada, OK 74820 | Oil Operator | Jan 2020 |
| 639 | Alfred C. Glassell, Jr. | | Oil & Gas Operator | Apr 2007 |
| 640 | Alfred Lamson-James A. Crocker | | Oil & Gas Operator | Sep 1986 |
| 641 | Alfred, Dewayne L | Weston, WV 26542-0478 | Oil & Gas Operator | Dec 1996 |
| 642 | Algoa Operating Company, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2002 |
| 643 | Alice & Andrew & George Hazer | Girard, PA 16417-9801 | Gas Operator | Dec 2024 |
| 644 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 645 | Alice-Sidney Oil Co LTD PRTSHP | | Oil & Gas Operator | Mar 2020 |
| 646 | Alinet Corporation | | Oil & Gas Operator | Aug 2013 |
| 647 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 648 | All Around Distribution, Inc. | Stephenville, TX 76401 | Oil Operator | May 2025 |
| 649 | All Exploration LLC | Oklahoma City, OK 73120-7829 | Oil & Gas Operator | Feb 2025 |
| 650 | All Saints Lutheran Church | Hamburg, NY 14075 | Gas Operator | Dec 2023 |
| 651 | All States Oil & Producing Co Inc | Canton, OH 44702 | Oil & Gas Operator | Dec 2018 |
| 652 | All-Southwest Petroleum, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Oct 1997 |
| 653 | Allam Carl Oil C | | Oil Operator | Mar 1986 |
| 654 | Allam Kevin T Oi | | Oil Operator | Jun 1988 |
| 655 | Allam Production, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | Jan 2025 |
| 656 | Allam WM Robt Jr | | Oil Operator | Aug 1993 |
| 657 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 658 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 659 | Allegany Energy, Inc. | Belmont, NY 14813 | Oil & Gas Operator | Dec 2023 |
| 660 | Allegheny Enterprises Inc | Corsica, PA 15829-3833 | Oil & Gas Operator | Dec 2018 |
| 661 | Allegheny Natural Resources Inc | Gibsonia, PA 15044-8055 | Gas Operator | Dec 2019 |
| 662 | Allegheny Producers Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1984 |
| 663 | Allegiance Operating Inc. | Wichita Falls, TX 76307 | Oil Operator | May 2025 |
| 664 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 665 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 666 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 667 | Allen & Allen Oil Co | | Oil Operator | Dec 2024 |
| 668 | Allen & Grace Oil Company | Kingsbury, TX 78638 | Oil & Gas Operator | Jul 1997 |
| 669 | Allen & Shumate, Inc. | Alice, TX 78333 | Oil & Gas Operator | Jan 1996 |
| 670 | Allen And Crouch | Casper, WY 82602 | Oil & Gas Operator | Mar 2020 |
| 671 | Allen And Schramm Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 672 | Allen Benne | Ramona, OK 74061-3612 | Oil Operator | Aug 2010 |
| 673 | Allen Brothers | | Oil & Gas Operator | Dec 2024 |
| 674 | Allen Brothers Company | Oil City, LA 71061 | Oil & Gas Operator | Apr 1997 |
| 675 | Allen Delmar | Okemah, OK 74859-9801 | Oil & Gas Operator | Dec 2000 |
| 676 | Allen Drilling C | | Oil & Gas Operator | Nov 1994 |
| 677 | Allen Drilling Company | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2009 |
| 678 | Allen Energy LLC | Cochranton, PA 16314-6214 | Oil & Gas Operator | Dec 2024 |
| 679 | Allen J D & Comp | | Oil Operator | Jan 1983 |
| 680 | Allen J W Revocable Trust | Tulsa, OK 74101-0411 | Oil Operator | Nov 1998 |
| 681 | Allen K Trobaugh | Midland, TX 79705 | Oil & Gas Operator | Mar 1997 |
| 682 | Allen Kent | Okemah, OK 74859-9700 | Oil Operator | Feb 2025 |
| 683 | Allen Mabel C | Dublin, OH 43017 | Oil Operator | Dec 1988 |
| 684 | Allen Michael | Broken Arrow, OK 74014-2239 | Oil & Gas Operator | Feb 2025 |
| 685 | Allen Oil & Gas LLC | Ardmore, OK 73401 | Oil Operator | Aug 2022 |
| 686 | Allen Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jun 2016 |
| 687 | Allen Operating Company, LLC | | Oil & Gas Operator | Dec 2022 |
| 688 | Allen Petroleum Company | | Oil Operator | Apr 1996 |
| 689 | Allen Petroleum, Inc. | | Oil Operator | Jul 2010 |
| 690 | Allen Richard R | Bartlesville, OK 74005 | Oil Operator | Aug 1999 |
| 691 | Allen Wade | Okmulgee, OK 74447-9717 | Oil & Gas Operator | Dec 2021 |
| 692 | Allen, C. L. (Doie) | Wichita Falls, TX 76309 | Oil & Gas Operator | May 2025 |
| 693 | Allen, Mabel F. | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Jul 2002 |
| 694 | Allenco Energy Inc. | | Oil & Gas Operator | Feb 2025 |
| 695 | Allenergy Operating Co Inc | Coffeyville, KS 67337-6653 | Oil & Gas Operator | Mar 2015 |
| 696 | Allenergy, Inc. | Grove, OK 74345 | Oil & Gas Operator | Jul 2012 |
| 697 | Alliance Energy LLC | Hutchinson, KS 67501 | Oil & Gas Operator | Jan 2025 |
| 698 | Alliance Exploration Co., LLC | Tulsa, OK 74119 | Oil Operator | Apr 2017 |
| 699 | Alliance Exploration Corp. | | Oil & Gas Operator | Mar 1983 |
| 700 | Alliance Ogo, LP | Pleasanton, CA 94588 | Oil & Gas Operator | May 2025 |