| 601 | Alpha Petro Development Inc | Tulsa, OK 74136-7048 | Oil & Gas Operator | May 2013 |
| 602 | Alpha Petroleum | | Oil & Gas Operator | Jan 2025 |
| 603 | Alpha Petrovision Us Inc | Canada, 00100 | Oil & Gas Operator | May 2013 |
| 604 | Alpha Resources, Inc | | Oil & Gas Operator | Jun 2003 |
| 605 | Alpha Shale Res LP | Canonsburg, PA 15317-9554 | Gas Operator | Aug 2017 |
| 606 | Alpine Drilling | | Oil & Gas Operator | May 1994 |
| 607 | Alpine Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2000 |
| 608 | Alpine Energy Corp. | | Oil & Gas Operator | Jun 2004 |
| 609 | Alpine Energy, Inc. | | Oil & Gas Operator | Dec 1999 |
| 610 | Alpine Expl. Companies, Inc. | | Oil & Gas Operator | Jan 2024 |
| 611 | Alpine Exploration Co, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Nov 2017 |
| 612 | Alpine Gas Company, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2006 |
| 613 | Alpine Gas Operator, LLC | | Oil & Gas Operator | Jun 2024 |
| 614 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 615 | Alpine Oil & Gas Corp | Durango, CO 81302 | Gas Operator | Jun 2003 |
| 616 | Alpine Oil & Gas Inc | Edmond, OK 73083-1264 | Oil & Gas Operator | Mar 2008 |
| 617 | Alpine Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Jul 2018 |
| 618 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 619 | Alpine Well Service Inc | | Oil & Gas Operator | Dec 2023 |
| 620 | Alps Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Aug 1999 |
| 621 | Alquip Limited Liability Company | Buckhannon, WV 26201-2049 | Gas Operator | Dec 2021 |
| 622 | Alsid Oil & Gas | Hanoverton,, OH 44423 | Oil & Gas Operator | Dec 2003 |
| 623 | Alsup 1-19 LLC | Lindsay, OK 73052 | Oil Operator | Jun 2025 |
| 624 | Alt Production, LLC | Kilgore, TX 75663 | Oil Operator | Sep 2025 |
| 625 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 626 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Sep 2025 |
| 627 | Alta VIsta Oil Corporation | Clearmont, WY 82835 | Oil & Gas Operator | Jul 2021 |
| 628 | Altair Corporation | | Oil & Gas Operator | Jul 1998 |
| 629 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 630 | Altalay STX LLC | San Juan, PR 00968 | Oil & Gas Operator | Sep 2025 |
| 631 | Altamont Energy Operating LLC | Greenwood VIlliage, CO 80111 | Oil & Gas Operator | Sep 2024 |
| 632 | Altamont Oil & Gas Inc. | Cut Bank, MT 59427-0200 | Oil & Gas Operator | May 2012 |
| 633 | Altavista Energy, Inc. | Wellsville, KS 66092 | Oil Operator | Apr 2025 |
| 634 | Alteria, LLC | Grayson, KY 41143 | Oil & Gas Operator | Dec 2023 |
| 635 | Alternative Ener | | Oil Operator | Jan 1995 |
| 636 | Altex Energy Corporation | Oklahoma City, OK 73142-1920 | Oil & Gas Operator | Mar 2015 |
| 637 | Altex Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 1985 |
| 638 | Altex Oil Company | Breckenridge, CO 80424 | Oil & Gas Operator | Dec 2005 |
| 639 | Altex Oil Corp | Breckenridge, CO 80424-1057 | Oil & Gas Operator | Dec 1999 |
| 640 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 641 | Altex Resources, Inc. (A Texas Corp.) | FT. Worth, TX 76107 | Oil Operator | Apr 1997 |
| 642 | Altheirs Oil, Inc. | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 643 | Altier Brothers Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 644 | Altier Petroleum Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 645 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2025 |
| 646 | Alto Minerals, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2019 |
| 647 | Alton Oil LLC | Winfield, KS 67156 | Oil & Gas Operator | Apr 2025 |
| 648 | Altos Petroleum Serv Inc | Bristolville, OH 44402 | Oil & Gas Operator | Dec 1992 |
| 649 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 650 | Alturas Energy, LLC | Sidney, MT 59270 | Oil Operator | Mar 2022 |
| 651 | Altus Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Jul 1984 |
| 652 | Alumni Oil LLC | Plano, TX 75024 | Oil Operator | Sep 2025 |
| 653 | Alumni Petroleum And Resource Management Corp | | Oil & Gas Operator | Mar 1988 |
| 654 | Alva J. Dixon | | Oil & Gas Operator | Aug 1991 |
| 655 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | Sep 2025 |
| 656 | Alvey Partners | Slaton, TX 79364 | Gas Operator | Sep 2025 |
| 657 | Alvin & Roger Wilson | | Oil Operator | Dec 2007 |
| 658 | Alvin Wilson, Et Al | | Oil Operator | May 1991 |
| 659 | Alyaha Energy, LLC | Dumas, TX 79029 | Oil & Gas Operator | Sep 2025 |
| 660 | Alyana Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Apr 1995 |
| 661 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 662 | Am-Tek Oil Inc | Spokane, WA 99201 | Oil & Gas Operator | Dec 2023 |
| 663 | Am-West Petroleum Inc | Upton, WY 82730 | Oil & Gas Operator | Sep 2015 |
| 664 | Amac Energy, L.L.C. | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2025 |
| 665 | Amac Inc | Newark, OH 43055 | Oil & Gas Operator | Dec 1989 |
| 666 | Amalgamated Bonanza Petr. LTD. | | Oil & Gas Operator | Apr 1980 |
| 667 | Amalgamated Sludge NM, LLC | Dallas, TX 75208 | Gas Operator | Jun 2025 |
| 668 | Amarex Inc | | Oil & Gas Operator | Dec 1996 |
| 669 | Amarex Incorpora | | Oil Operator | Feb 1985 |
| 670 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Sep 2025 |
| 671 | Amarillo Natural Gas, Inc. | Amarillo, TX 79119 | Gas Operator | Jul 1996 |
| 672 | Amarillo Oil Company | | Oil & Gas Operator | Aug 1980 |
| 673 | Amaroq Resources, LLC | | Gas Operator | Jul 2025 |
| 674 | Amata Oils Inc | | Oil Operator | Dec 2015 |
| 675 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 676 | Amax Petroleum C | | Oil & Gas Operator | Aug 1986 |
| 677 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2012 |
| 678 | Amax Petroluem Corp. | | Oil & Gas Operator | Nov 1983 |
| 679 | Amazon Exploration LLC | | Oil Operator | Apr 2016 |
| 680 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Sep 2025 |
| 681 | Ambassador Oil Company, LLC | Abilene, TX 79604 | Oil & Gas Operator | Sep 2025 |
| 682 | Ambassador Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Sep 2025 |
| 683 | Amber Oil Compan | | Oil Operator | Aug 1995 |
| 684 | Amberex Corporation | Denver, CO 80237 | Oil & Gas Operator | Sep 1984 |
| 685 | Amble Petroleum Co., Inc. | Tuscola, TX 79562 | Oil Operator | Sep 2025 |
| 686 | Ambra Oil & Gas Company | Rangely, CO 81648 | Oil & Gas Operator | Jul 2006 |
| 687 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 688 | Ambrotra Energy LLC | Medicine Lodge, KS 67104 | Oil Operator | Mar 2025 |
| 689 | Amcole Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 2000 |
| 690 | Amcon Resources | Oklahoma City, OK 73102 | Gas Operator | Jul 2000 |
| 691 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 692 | Amedan Resources, Inc. | Chickasha, OK 73023 | Oil & Gas Operator | Mar 2008 |
| 693 | Amelia Exploration LLC | Marble Falls, TX 78654 | Oil Operator | Sep 2025 |
| 694 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 695 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 696 | Amer Energy Develop Inc | Columbus, OH 43220 | Oil & Gas Operator | Dec 1989 |
| 697 | Amer Exploration Co | Plymouth Meeting, PA 19462-1640 | Oil & Gas Operator | Dec 2008 |
| 698 | Amer Natural Resources LLC | Rural Valley, PA 16249-0306 | Oil & Gas Operator | Dec 2018 |
| 699 | Amer Oil & Gas LLC | MT Morris, PA 15349 | Oil & Gas Operator | Jun 2025 |
| 700 | Amer-Tex Energy Inc | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Feb 2012 |