| 1401 | Ashland Exploration | | Oil & Gas Operator | May 1979 |
| 1402 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 1403 | Ashland Exploration Properties Inc | | Gas Operator | Dec 1996 |
| 1404 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 1405 | Ashlawn Corporation | | Oil & Gas Operator | Dec 2008 |
| 1406 | Ashlawn Energy, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1407 | Ashley Valley Operating Company LLC | Orem, UT 84097 | Oil & Gas Operator | Nov 2024 |
| 1408 | Ashley, Jim Company | Broken Arrow, OK 74012 | Oil Operator | Sep 2024 |
| 1409 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 1410 | Ashlock True | | Oil Operator | Nov 1987 |
| 1411 | Ashlock, Beryl Roderick | Virgil, KS 66870 | Oil Operator | Dec 2019 |
| 1412 | Ashlock, Edd | Neal, KS 66863 | Oil Operator | Dec 1986 |
| 1413 | Ashlock, Ernest H. | Overland Park, KS 66202 | Oil Operator | Jun 1987 |
| 1414 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 1415 | Ashtola Prod Co | Valley Forge, PA 19482-0858 | Gas Operator | Dec 1986 |
| 1416 | Ashton Oil & Gas, Inc. | | Oil Operator | Jun 1990 |
| 1417 | Ashuca | | Oil Operator | Feb 1998 |
| 1418 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 1419 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 1420 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 1421 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 1422 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1423 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1424 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1425 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1426 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1427 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1428 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1429 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1430 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1431 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1432 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2025 |
| 1433 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1434 | Asphalta LLC | | Oil & Gas Operator | Dec 2024 |
| 1435 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1436 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1437 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | Apr 2025 |
| 1438 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1439 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Feb 2025 |
| 1440 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1441 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1442 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1443 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1444 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1445 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1446 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1447 | Associated Trans & Trading Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1998 |
| 1448 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Dec 2024 |
| 1449 | Astin Corp. | Dallas, TX 75229 | Oil & Gas Operator | Sep 1994 |
| 1450 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 1451 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 1452 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Apr 2025 |
| 1453 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 1454 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 1455 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Apr 2025 |
| 1456 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 1457 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 1458 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |
| 1459 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 1460 | Aterra Exploration, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2025 |
| 1461 | Atex Exploration & Operating Co. | Whitesboro, TX 76273 | Oil & Gas Operator | Apr 2025 |
| 1462 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 1463 | Atha Edward E | Athens, OH 45701 | Oil & Gas Operator | Dec 1987 |
| 1464 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 1465 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Jan 2025 |
| 1466 | Athanor Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 1467 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 1468 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Apr 2025 |
| 1469 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Apr 2025 |
| 1470 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 1471 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 1472 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 1473 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1474 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 1475 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Apr 2025 |
| 1476 | Atkins Production | | Oil Operator | Dec 2008 |
| 1477 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 1478 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 1479 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Apr 2025 |
| 1480 | Atkinson WM H Estate | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2001 |
| 1481 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 1482 | Atkinson, Jim | Nocona, TX 76255 | Oil & Gas Operator | Apr 2025 |
| 1483 | Atla Energy Inc | Zanesville, OH 43702-2607-2607 | Oil & Gas Operator | Dec 2003 |
| 1484 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Jan 2025 |
| 1485 | Atlanta Exploration Co. | | Oil & Gas Operator | Oct 2001 |
| 1486 | Atlantic & Gulf Petroleum Co. | Houston, TX 77002 | Gas Operator | Mar 1991 |
| 1487 | Atlantic Energy Corp Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 1991 |
| 1488 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 1489 | Atlantic Oil And Gas Development LLC | Rockledge, FL 32955 | Oil Operator | Nov 2024 |
| 1490 | Atlantic Oil Company | | Oil & Gas Operator | Dec 2024 |
| 1491 | Atlantic Oil Corporation | Denver, CO 80206 | Oil & Gas Operator | Dec 1982 |
| 1492 | Atlantic Operating II, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 1493 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 1494 | Atlantic Petroleum Co. | | Oil Operator | Mar 2000 |
| 1495 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 1496 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 1497 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Apr 2025 |
| 1498 | Atlantis Oil Cor | | Oil Operator | Sep 1989 |
| 1499 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1500 | Atlas Eagle Ford Oper Co, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2020 |