| 601 | Allwaste Oilfield Services Inc | | Oil Operator | May 1996 |
| 602 | Alma E & John Kondus | Venice, FL 34285-7001 | Oil & Gas Operator | Dec 2009 |
| 603 | Alma Gas Co Inc | Alma, NY 14708 | Gas Operator | Dec 2024 |
| 604 | Almac Engineering | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2007 |
| 605 | Almack John And Glenda | Perry, OK 73077-8819 | Oil & Gas Operator | Apr 2016 |
| 606 | Alme, Henry A. | Cut Bank, MT 59427 | Gas Operator | Nov 2025 |
| 607 | Almond Crest Oil LLC | | Oil & Gas Operator | Nov 2025 |
| 608 | Almont Energy LLC | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2021 |
| 609 | Aln Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 1993 |
| 610 | Alna Energy LLC | New Lexington, OH 43764 | Oil & Gas Operator | Dec 2023 |
| 611 | Alog, LLC | Brewton, AL 36427 | Oil & Gas Operator | Nov 2025 |
| 612 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 613 | Alpha Coal West Inc | Gillette, WY 82716 | Oil & Gas Operator | Jun 2020 |
| 614 | Alpha Energy | Anson, TX 79501 | Oil & Gas Operator | Oct 2016 |
| 615 | Alpha Energy LLC | Ashland, OR 97520 | Oil & Gas Operator | Oct 2025 |
| 616 | Alpha Energy Texas Operating LLC | Denver, CO 80222 | Oil & Gas Operator | Oct 2025 |
| 617 | Alpha Exploration Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Oct 1998 |
| 618 | Alpha Gamma Onshore, LLC | Midland, TX 79702 | Oil Operator | Feb 2026 |
| 619 | Alpha Gas Corporation | Jane Lew, WV 26378 | Oil & Gas Operator | Dec 2007 |
| 620 | Alpha Management | | Oil & Gas Operator | Jan 1994 |
| 621 | Alpha Oil & Gas Inc. | | Oil & Gas Operator | Sep 1989 |
| 622 | Alpha Oil Company | | Oil Operator | Jul 2004 |
| 623 | Alpha Omega Petroleum, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 1996 |
| 624 | Alpha Petro Development Inc | Tulsa, OK 74136-7048 | Oil & Gas Operator | May 2013 |
| 625 | Alpha Petroleum | | Oil & Gas Operator | Jan 2025 |
| 626 | Alpha Petrovision Us Inc | Canada, 00100 | Oil & Gas Operator | May 2013 |
| 627 | Alpha Resources, Inc | | Oil & Gas Operator | Jun 2003 |
| 628 | Alpha Shale Res LP | Canonsburg, PA 15317-9554 | Gas Operator | Aug 2017 |
| 629 | Alpha-Omega Energy | McAllen, TX 78501 | Gas Operator | Apr 1998 |
| 630 | Alpine Drilling | | Oil & Gas Operator | May 1994 |
| 631 | Alpine Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2000 |
| 632 | Alpine Energy Corp. | | Oil & Gas Operator | Jun 2004 |
| 633 | Alpine Energy, Inc. | | Oil & Gas Operator | Dec 1999 |
| 634 | Alpine Expl. Companies, Inc. | | Oil & Gas Operator | Jan 2024 |
| 635 | Alpine Exploration Co, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Nov 2017 |
| 636 | Alpine Gas Company, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2006 |
| 637 | Alpine Gas Operator, LLC | | Oil & Gas Operator | Jun 2024 |
| 638 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 639 | Alpine Oil & Gas Corp | Durango, CO 81302 | Gas Operator | Jun 2003 |
| 640 | Alpine Oil & Gas Inc | Edmond, OK 73083-1264 | Oil & Gas Operator | Mar 2008 |
| 641 | Alpine Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Jul 2018 |
| 642 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 643 | Alpine Well Service, Inc. | | Oil & Gas Operator | Dec 2023 |
| 644 | Alps Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Aug 1999 |
| 645 | Alquip Limited Liability Company | Buckhannon, WV 26201-2049 | Gas Operator | Dec 2021 |
| 646 | Alsid Oil & Gas | Hanoverton,, OH 44423 | Oil & Gas Operator | Dec 2003 |
| 647 | Alsup 1-19 LLC | Lindsay, OK 73052 | Oil Operator | Dec 2025 |
| 648 | Alt Production, LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 649 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 650 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Feb 2026 |
| 651 | Alta VIsta Oil Corporation | Clearmont, WY 82835 | Oil & Gas Operator | Jul 2021 |
| 652 | Altair Corporation | | Oil & Gas Operator | Jul 1998 |
| 653 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 654 | Altalay STX LLC | San Juan, PR 00968 | Oil & Gas Operator | Feb 2026 |
| 655 | Altamont Energy Operating LLC | Greenwood VIlliage, CO 80111 | Oil & Gas Operator | Sep 2024 |
| 656 | Altamont Oil & Gas Inc. | Cut Bank, MT 59427-0200 | Oil & Gas Operator | May 2012 |
| 657 | Altavista Energy, Inc. | Wellsville, KS 66092 | Oil Operator | Sep 2025 |
| 658 | Alteria, LLC | Grayson, KY 41143 | Oil & Gas Operator | Dec 2023 |
| 659 | Alternative Ener | | Oil Operator | Jan 1995 |
| 660 | Altex Energy Corporation | Oklahoma City, OK 73142-1920 | Oil & Gas Operator | Mar 2015 |
| 661 | Altex Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 1985 |
| 662 | Altex Oil Company | Breckenridge, CO 80424 | Oil & Gas Operator | Dec 2005 |
| 663 | Altex Oil Corp | Breckenridge, CO 80424-1057 | Oil & Gas Operator | Dec 1999 |
| 664 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 665 | Altex Resources, Inc. (A Texas Corp.) | FT. Worth, TX 76107 | Oil Operator | Apr 1997 |
| 666 | Altheirs Oil, Inc. | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 667 | Altier Brothers Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 668 | Altier Petroleum Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 669 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2026 |
| 670 | Alto Minerals, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2019 |
| 671 | Alton Oil LLC | Winfield, KS 67156 | Oil & Gas Operator | Sep 2025 |
| 672 | Altos Petroleum Serv Inc | Bristolville, OH 44402 | Oil & Gas Operator | Dec 1992 |
| 673 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 674 | Alturas Energy, LLC | Sidney, MT 59270 | Oil Operator | Mar 2022 |
| 675 | Altus Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Jul 1984 |
| 676 | Alumni Oil LLC | Plano, TX 75024 | Oil Operator | Feb 2026 |
| 677 | Alumni Petroleum And Resource Management Corp | | Oil & Gas Operator | Mar 1988 |
| 678 | Alva J. Dixon | | Oil & Gas Operator | Aug 1991 |
| 679 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 680 | Alvey Partners | Slaton, TX 79364 | Gas Operator | Feb 2026 |
| 681 | Alvin & Roger Wilson | | Oil Operator | Dec 2007 |
| 682 | Alvin Wilson, Et Al | | Oil Operator | May 1991 |
| 683 | Alyaha Energy, LLC | Dumas, TX 79029 | Oil & Gas Operator | Feb 2026 |
| 684 | Alyana Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Apr 1995 |
| 685 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 686 | Am Oil Company | Cyril, OK 73029 | Oil & Gas Operator | Nov 2025 |
| 687 | Am-Tek Oil Inc | Spokane, WA 99201 | Oil & Gas Operator | Dec 2023 |
| 688 | Am-West Petroleum Inc | Upton, WY 82730 | Oil & Gas Operator | Sep 2015 |
| 689 | Amac Energy, L.L.C. | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 690 | Amac Inc | Newark, OH 43055 | Oil & Gas Operator | Dec 1989 |
| 691 | Amalgamated Bonanza Petr. LTD. | | Oil & Gas Operator | Apr 1980 |
| 692 | Amalgamated Sludge NM, LLC | Dallas, TX 75208 | Gas Operator | Oct 2025 |
| 693 | Amarex Inc | | Oil & Gas Operator | Dec 1996 |
| 694 | Amarex Incorpora | | Oil Operator | Feb 1985 |
| 695 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Feb 2026 |
| 696 | Amarillo Natural Gas, Inc. | Amarillo, TX 79119 | Gas Operator | Jul 1996 |
| 697 | Amarillo Oil Company | | Oil & Gas Operator | Aug 1980 |
| 698 | Amaroq Resources, LLC | | Gas Operator | Jan 2026 |
| 699 | Amata Oils Inc | | Oil Operator | Dec 2015 |
| 700 | Amax Oil & Gas Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |