| 1401 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1402 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1403 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1404 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1405 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1406 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1407 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1408 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1409 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1410 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1411 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 1412 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1413 | Asphalta LLC | | Oil & Gas Operator | Oct 2025 |
| 1414 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1415 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1416 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | Dec 2025 |
| 1417 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1418 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Sep 2025 |
| 1419 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1420 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1421 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1422 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1423 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1424 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1425 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1426 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Sep 2025 |
| 1427 | Astin Corp. | Dallas, TX 75229 | Oil & Gas Operator | Sep 1994 |
| 1428 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 1429 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 1430 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Dec 2025 |
| 1431 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 1432 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 1433 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Dec 2025 |
| 1434 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 1435 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 1436 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 1437 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 1438 | Aterra Exploration, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2025 |
| 1439 | Atex Exploration & Operating Co. | Whitesboro, TX 76273 | Oil & Gas Operator | Dec 2025 |
| 1440 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 1441 | Atha Edward E | Athens, OH 45701 | Oil & Gas Operator | Dec 1987 |
| 1442 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 1443 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Sep 2025 |
| 1444 | Athanor Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 1445 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 1446 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Dec 2025 |
| 1447 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 1448 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 1449 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 1450 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 1451 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1452 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 1453 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Dec 2025 |
| 1454 | Atkins Production | | Oil Operator | Dec 2008 |
| 1455 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 1456 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 1457 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Dec 2025 |
| 1458 | Atkinson WM H Estate | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2001 |
| 1459 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 1460 | Atkinson, Jim | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 1461 | Atla Energy Inc | Zanesville, OH 43702-2607 | Oil & Gas Operator | Dec 2003 |
| 1462 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Aug 2025 |
| 1463 | Atlanta Exploration Co. | | Oil & Gas Operator | Oct 2001 |
| 1464 | Atlantic & Gulf Petroleum Co. | Houston, TX 77002 | Gas Operator | Mar 1991 |
| 1465 | Atlantic Energy Corp Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 1991 |
| 1466 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 1467 | Atlantic Oil And Gas Development LLC | Rockledge, FL 32955 | Oil Operator | Jul 2025 |
| 1468 | Atlantic Oil Company | | Oil & Gas Operator | Sep 2025 |
| 1469 | Atlantic Oil Corporation | Denver, CO 80206 | Oil & Gas Operator | Dec 1982 |
| 1470 | Atlantic Operating II, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 1471 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 1472 | Atlantic Petroleum Co. | | Oil Operator | Mar 2000 |
| 1473 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 1474 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 1475 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 1476 | Atlantis Oil Cor | | Oil Operator | Sep 1989 |
| 1477 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1478 | Atlas Eagle Ford Oper Co, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2020 |
| 1479 | Atlas Energy Corp | | Oil & Gas Operator | Nov 2005 |
| 1480 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 1481 | Atlas Energy Group Inc | Uniontown, OH 44685-9575 | Oil & Gas Operator | Dec 2011 |
| 1482 | Atlas Fuel Supply, LTD. | Houston, TX 77269 | Oil Operator | Dec 2025 |
| 1483 | Atlas Growth Texas, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1484 | Atlas Noble LLC | Fort Worth, TX 76116-5423 | Oil & Gas Operator | Jun 2020 |
| 1485 | Atlas Oil & Gas Exploration, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2003 |
| 1486 | Atlas Oil Co, Inc | | Oil Operator | Dec 2023 |
| 1487 | Atlas Oil Company, LLC | Versailles, KY 40383 | Oil Operator | Dec 2023 |
| 1488 | Atlas Oil Exploration, Inc | | Oil & Gas Operator | Dec 1977 |
| 1489 | Atlas Oil Inc | Oklahoma City, OK 73154-0467 | Oil & Gas Operator | Aug 2008 |
| 1490 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 1491 | Atlas Production Services | | Oil & Gas Operator | Feb 1999 |
| 1492 | Atlas Resources Inc | Coraopolis, PA 15108-0611 | Oil & Gas Operator | Dec 2007 |
| 1493 | Atlas Resources LLC | Pittsburgh, PA 15275-1033 | Oil & Gas Operator | Jun 2018 |
| 1494 | Atls Production Company LLC | Fort Worth, TX 76102-7426 | Gas Operator | Sep 2020 |
| 1495 | Atmic, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2008 |
| 1496 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 1497 | Atnipp, H. L. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 1498 | Atoka Energy LLC | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |
| 1499 | Atoka Operating Permian, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2023 |
| 1500 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |