| 601 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 602 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 603 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2024 |
| 604 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 605 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 606 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 607 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 608 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 609 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 610 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 611 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 612 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 613 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | Apr 2024 |
| 614 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Apr 2024 |
| 615 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 616 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Apr 2024 |
| 617 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 618 | Atchley Resources Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2024 |
| 619 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 620 | Atex Exploration & Operating Co. | Whitesboro, TX 76273 | Oil & Gas Operator | Apr 2024 |
| 621 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 622 | Athanor Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 623 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 624 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Apr 2024 |
| 625 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |
| 626 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 627 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 628 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 629 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 630 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 631 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Apr 2024 |
| 632 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 633 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Apr 2024 |
| 634 | Atkinson, Jim | Nocona, TX 76255 | Oil & Gas Operator | Apr 2024 |
| 635 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 636 | Atlantic Oil Corporation | Denver, CO 80206 | Oil & Gas Operator | Dec 1982 |
| 637 | Atlantic Operating II, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 638 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 639 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 640 | Atlantic Richfield Company | Plano, TX 75094-1744 | Oil & Gas Operator | Dec 2016 |
| 641 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 642 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 643 | Atlas Eagle Ford Oper Co, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2020 |
| 644 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2024 |
| 645 | Atlas Fuel Supply, LTD. | Houston, TX 77269 | Oil Operator | Apr 2024 |
| 646 | Atlas Growth Texas, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 647 | Atlas Oil & Gas Exploration, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2003 |
| 648 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 649 | Atmic, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2008 |
| 650 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 651 | Atnipp, H. L. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 652 | Atoka Operating Permian, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2023 |
| 653 | Atoka Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 654 | Atp Oil & Gas Corporation | Houston, TX 77027 | Oil & Gas Operator | Jun 2008 |
| 655 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 656 | Atropos Production Corporation | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 657 | Atwa Energy Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1996 |
| 658 | Atwell Technical Services, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 659 | Atwell, David L. | Duncan, OK 73533 | Oil & Gas Operator | Jul 2003 |
| 660 | Auburn Enterprises, Inc. | Kyle, TX 78640 | Oil & Gas Operator | Aug 2003 |
| 661 | Auden Oil Inc. | Hardin, TX 77561 | Oil Operator | Apr 2024 |
| 662 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2024 |
| 663 | August Oil | Plano, TX 75093 | Oil & Gas Operator | Aug 2003 |
| 664 | Augusta Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Nov 2002 |
| 665 | Augusta Oil & Gas Inc | Abilene, TX 79604 | Oil & Gas Operator | Dec 2015 |
| 666 | Augustus Oil And Gas Corporation | Austin, TX 78731 | Oil & Gas Operator | Apr 2024 |
| 667 | Aurora Exploration & Prod Co | Whitesboro, TX 76273 | Oil Operator | Apr 2024 |
| 668 | Aurora Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jan 2000 |
| 669 | Aurora Operating, LLC | Houston, TX 77010 | Oil Operator | Apr 2024 |
| 670 | Aurora Power Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Aug 2018 |
| 671 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 672 | Aurora USA Development, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 673 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 674 | Ausland Production Company | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 675 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 676 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Apr 2024 |
| 677 | Austin Minerals Inc. | Austin, TX 78720 | Oil & Gas Operator | Apr 2024 |
| 678 | Austin Operating, LLC. | Chicago, IL 60622 | Oil Operator | Apr 2024 |
| 679 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 680 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 681 | Austin Ridge Energy Corporation | Houston, TX 77224 | Oil & Gas Operator | Apr 2024 |
| 682 | Austin, Dewey | Burkburnett, TX 76354 | Oil & Gas Operator | Nov 1996 |
| 683 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 684 | Auterra Operating, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Apr 2024 |
| 685 | Autry Producing Co. | Cisco, TX 76437 | Oil & Gas Operator | Aug 2008 |
| 686 | Autry Producing Inc. | Cisco, TX 76437 | Oil Operator | Apr 2024 |
| 687 | Autry, Martin | Seguin, TX 78155 | Oil Operator | Apr 2024 |
| 688 | Autumn Energy LLC | Andrews, TX 79714 | Oil Operator | Aug 2017 |
| 689 | Av-Tech Resources Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2022 |
| 690 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 691 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Apr 2024 |
| 692 | Avalon TX Operating, LLC | Andrews, TX 79714 | Oil & Gas Operator | Jan 2023 |
| 693 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 694 | Averill, W. M. Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2003 |
| 695 | Avery, Irving W. | Buena VIsta, CO 81211 | Oil & Gas Operator | Mar 2008 |
| 696 | Avian Tech International, Inc. | Euless, TX 76040 | Oil & Gas Operator | Apr 1995 |
| 697 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 698 | Avighna Energy Inc | Sugar Land, TX 77487 | Oil & Gas Operator | Jan 2019 |
| 699 | Avips Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 1996 |
| 700 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |