| 601 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 602 | Alpine Oil & Gas Corp | Durango, CO 81302 | Gas Operator | Jun 2003 |
| 603 | Alpine Oil & Gas Inc | Edmond, OK 73083-1264 | Oil & Gas Operator | Mar 2008 |
| 604 | Alpine Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Jul 2018 |
| 605 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 606 | Alpine Well Service, Inc. | | Oil & Gas Operator | Dec 2023 |
| 607 | Alps Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Aug 1999 |
| 608 | Alsid Oil & Gas | Hanoverton,, OH 44423 | Oil & Gas Operator | Dec 2003 |
| 609 | Alsup 1-19 LLC | Lindsay, OK 73052 | Oil Operator | May 2026 |
| 610 | Alt Production, LLC | Kilgore, TX 75663 | Oil Operator | Jul 2026 |
| 611 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 612 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Jul 2026 |
| 613 | Alta VIsta Oil Corporation | Clearmont, WY 82835 | Oil & Gas Operator | Jul 2021 |
| 614 | Altair Corporation | | Oil & Gas Operator | Jul 1998 |
| 615 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 616 | Altalay STX LLC | Guaynabo, PR 00968 | Oil & Gas Operator | Jul 2026 |
| 617 | Altamont Energy Operating LLC | Greenwood VIlliage, CO 80111 | Oil & Gas Operator | Sep 2024 |
| 618 | Altamont Oil & Gas Inc. | Cut Bank, MT 59427-0200 | Oil & Gas Operator | May 2012 |
| 619 | Altavista Energy, Inc. | Wellsville, KS 66092 | Oil Operator | Mar 2026 |
| 620 | Alternative Ener | | Oil Operator | Jan 1995 |
| 621 | Altex Energy Corporation | Oklahoma City, OK 73142-1920 | Oil & Gas Operator | Mar 2015 |
| 622 | Altex Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 1985 |
| 623 | Altex Oil Corp | Breckenridge, CO 80424-1057 | Oil & Gas Operator | Dec 1999 |
| 624 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 625 | Altex Resources, Inc. (A Texas Corp.) | FT. Worth, TX 76107 | Oil Operator | Apr 1997 |
| 626 | Altheirs Oil, Inc. | Corning, OH 43730 | Oil & Gas Operator | Dec 2025 |
| 627 | Altier Brothers Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 628 | Altier Petroleum Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2025 |
| 629 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2026 |
| 630 | Alto Minerals, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2019 |
| 631 | Alton Oil LLC | Winfield, KS 67156 | Oil & Gas Operator | Mar 2026 |
| 632 | Altos Petroleum Serv Inc | Bristolville, OH 44402 | Oil & Gas Operator | Dec 1992 |
| 633 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 634 | Alturas Energy LLC | Sidney, MT 59270 | Oil Operator | Mar 2022 |
| 635 | Alumni Oil LLC | Plano, TX 75024 | Oil Operator | Jul 2026 |
| 636 | Alumni Petroleum And Resource Management Corp | | Oil & Gas Operator | Mar 1988 |
| 637 | Alva J. Dixon | | Oil & Gas Operator | Aug 1991 |
| 638 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | Jul 2026 |
| 639 | Alvey Partners | Slaton, TX 79364 | Gas Operator | Jul 2026 |
| 640 | Alvin & Roger Wilson | | Oil Operator | Dec 2007 |
| 641 | Alvin Wilson, Et Al | | Oil Operator | May 1991 |
| 642 | Alyaha Energy, LLC | Dumas, TX 79029 | Oil & Gas Operator | Jul 2026 |
| 643 | Alyana Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Apr 1995 |
| 644 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 645 | Am Oil Company | Cyril, OK 73029 | Oil & Gas Operator | Mar 2026 |
| 646 | Am-Tek Oil Inc | Spokane, WA 99201 | Oil & Gas Operator | Dec 2024 |
| 647 | Amac Energy, L.L.C. | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2026 |
| 648 | Amac Inc | Newark, OH 43055 | Oil & Gas Operator | Dec 1989 |
| 649 | Amalgamated Bonanza Petr. LTD. | | Oil & Gas Operator | Apr 1980 |
| 650 | Amalgamated Sludge NM, LLC | Dallas, TX 75208 | Gas Operator | May 2026 |
| 651 | Amarex Inc | | Oil & Gas Operator | Dec 1996 |
| 652 | Amarex Incorpora | | Oil Operator | Feb 1985 |
| 653 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2026 |
| 654 | Amarillo Natural Gas, Inc. | Amarillo, TX 79119 | Gas Operator | Jul 1996 |
| 655 | Amarillo Oil Company | | Oil & Gas Operator | Aug 1980 |
| 656 | Amaroq Resources, LLC | | Gas Operator | Mar 2026 |
| 657 | Amata Oils Inc | | Oil Operator | Dec 2015 |
| 658 | Amax Oil & Gas Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 659 | Amax Petroleum C | | Oil & Gas Operator | Aug 1986 |
| 660 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2012 |
| 661 | Amax Petroluem Corp. | | Oil & Gas Operator | Nov 1983 |
| 662 | Amazon Exploration LLC | | Oil Operator | Apr 2016 |
| 663 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Jul 2026 |
| 664 | Ambassador Oil Company, LLC | Abilene, TX 79604 | Oil & Gas Operator | Jul 2026 |
| 665 | Ambassador Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Jul 2026 |
| 666 | Amber Oil Compan | | Oil Operator | Aug 1995 |
| 667 | Amble Petroleum Co., Inc. | Tuscola, TX 79562 | Oil Operator | Sep 2025 |
| 668 | Ambra Oil & Gas Company | Rangely, CO 81648 | Oil & Gas Operator | Jul 2006 |
| 669 | Ambrit Energy Corp. | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 670 | Amcole Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 2000 |
| 671 | Amcon Resources | Oklahoma City, OK 73102 | Gas Operator | Jul 2000 |
| 672 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 673 | Amedan Resources, Inc. | Chickasha, OK 73023 | Oil & Gas Operator | Mar 2008 |
| 674 | Amelia Exploration LLC | Marble Falls, TX 78654 | Oil Operator | Jul 2026 |
| 675 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2026 |
| 676 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 677 | Amer Energy Develop Inc | Columbus, OH 43220 | Oil & Gas Operator | Dec 1989 |
| 678 | Amer Exploration Co | Plymouth Meeting, PA 19462-1640 | Oil & Gas Operator | Dec 2008 |
| 679 | Amer Natural Resources LLC | Rural Valley, PA 16249-0306 | Oil & Gas Operator | Dec 2018 |
| 680 | Amer Oil & Gas LLC | MT Morris, PA 15349 | Oil & Gas Operator | Apr 2026 |
| 681 | Amer-Tex Energy Inc | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Feb 2012 |
| 682 | Amer. Intl. Petroleum Corp. | | Oil & Gas Operator | Dec 1990 |
| 683 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 684 | Amerada Hess Corp-Placid | | Gas Operator | Sep 1990 |
| 685 | Amerada Hess Corp. Unit Operator | | Oil & Gas Operator | Dec 1986 |
| 686 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 687 | Amerada Hess-Ethyl Corporation | | Oil & Gas Operator | Sep 1990 |
| 688 | Ameredev New Mexico, LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 689 | Ameredev Operating, LLC | Austin, TX 78716 | Oil & Gas Operator | Jul 2026 |
| 690 | Amerex Corporation | Edmond, OK 73013-1044 | Oil & Gas Operator | Apr 2020 |
| 691 | American B. C. Resources | | Oil & Gas Operator | Oct 1985 |
| 692 | American Barter Petroleum Inc. | | Oil & Gas Operator | Jun 1993 |
| 693 | American Capital Corporation | San Marcos, CA 92069 | Oil & Gas Operator | Sep 2014 |
| 694 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | Jul 2026 |
| 695 | American Casing Crews, Inc. | | Oil Operator | Dec 1979 |
| 696 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 697 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 698 | American Delta Corporation | Portland, TX 78374 | Oil & Gas Operator | Jun 2013 |
| 699 | American Domestic MGMT Inc | Tulsa, OK 74155 | Oil & Gas Operator | Apr 2015 |
| 700 | American Eagle Energy Corporation | | Oil & Gas Operator | Oct 2015 |