| 1601 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 1602 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 1603 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1604 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1605 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1606 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1607 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1608 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1609 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1610 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1611 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1612 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1613 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 1614 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1615 | Asphalta LLC | | Oil & Gas Operator | Dec 2025 |
| 1616 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1617 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1618 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | Feb 2026 |
| 1619 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1620 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Dec 2025 |
| 1621 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1622 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1623 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1624 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1625 | Associated Operating & Explor. | Dallas, TX 75243 | Oil & Gas Operator | Feb 2026 |
| 1626 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1627 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1628 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1629 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Nov 2025 |
| 1630 | Astin Corp. | Dallas, TX 75229 | Oil & Gas Operator | Sep 1994 |
| 1631 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 1632 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 1633 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 1634 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 1635 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 1636 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Feb 2026 |
| 1637 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 1638 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 1639 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 1640 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 1641 | Aterra Exploration, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 1642 | Atex Exploration & Operating Co. | Whitesboro, TX 76273 | Oil & Gas Operator | Feb 2026 |
| 1643 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1644 | Atha Edward E | Athens, OH 45701 | Oil & Gas Operator | Dec 1987 |
| 1645 | Atha-Richey Ener GRP Inc | Athens, OH 45701 | Oil & Gas Operator | Dec 1991 |
| 1646 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 1647 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Dec 2025 |
| 1648 | Athanor Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 1649 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 1650 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Feb 2026 |
| 1651 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Feb 2026 |
| 1652 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 1653 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 1654 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 1655 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1656 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1657 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Feb 2026 |
| 1658 | Atkins Production | | Oil Operator | Dec 2008 |
| 1659 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 1660 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 1661 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Feb 2026 |
| 1662 | Atkinson WM H Estate | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2001 |
| 1663 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 1664 | Atkinson, Jim | Nocona, TX 76255 | Oil & Gas Operator | Feb 2026 |
| 1665 | Atla Energy Inc | Zanesville, OH 43702-2607 | Oil & Gas Operator | Dec 2003 |
| 1666 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Nov 2025 |
| 1667 | Atlanta Exploration Co. | | Oil & Gas Operator | Oct 2001 |
| 1668 | Atlantic & Gulf Petroleum Co. | Houston, TX 77002 | Gas Operator | Mar 1991 |
| 1669 | Atlantic Energy Corp Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 1991 |
| 1670 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 1671 | Atlantic Oil And Gas Development LLC | Rockledge, FL 32955 | Oil Operator | Dec 2025 |
| 1672 | Atlantic Oil Company | | Oil & Gas Operator | Nov 2025 |
| 1673 | Atlantic Oil Corporation | Denver, CO 80206 | Oil & Gas Operator | Dec 1982 |
| 1674 | Atlantic Operating II, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1675 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 1676 | Atlantic Petroleum Co. | | Oil Operator | Mar 2000 |
| 1677 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 1678 | Atlantic Richfield Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2016 |
| 1679 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 1680 | Atlantis Oil Cor | | Oil Operator | Sep 1989 |
| 1681 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1682 | Atlas Eagle Ford Oper Co, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2020 |
| 1683 | Atlas Energy Corp | | Oil & Gas Operator | Nov 2005 |
| 1684 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 1685 | Atlas Energy Group Inc | Uniontown, OH 44685-9575 | Oil & Gas Operator | Dec 2011 |
| 1686 | Atlas Fuel Supply, LTD. | Houston, TX 77269 | Oil Operator | Feb 2026 |
| 1687 | Atlas Growth Texas, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1688 | Atlas Noble LLC | Fort Worth, TX 76116-5423 | Oil & Gas Operator | Jun 2020 |
| 1689 | Atlas Oil & Gas Exploration, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2003 |
| 1690 | Atlas Oil Co, Inc | | Oil Operator | Dec 2023 |
| 1691 | Atlas Oil Company, LLC | Versailles, KY 40383 | Oil Operator | Dec 2023 |
| 1692 | Atlas Oil Exploration, Inc | | Oil & Gas Operator | Dec 1977 |
| 1693 | Atlas Oil Inc | Oklahoma City, OK 73154-0467 | Oil & Gas Operator | Aug 2008 |
| 1694 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 1695 | Atlas Production Services | | Oil & Gas Operator | Feb 1999 |
| 1696 | Atlas Resources Inc | Coraopolis, PA 15108-0611 | Oil & Gas Operator | Dec 2007 |
| 1697 | Atlas Resources LLC | Pittsburgh, PA 15275-1033 | Oil & Gas Operator | Jun 2018 |
| 1698 | Atls Production Company LLC | Fort Worth, TX 76102-7426 | Gas Operator | Sep 2020 |
| 1699 | Atmic, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2008 |
| 1700 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |