| 1301 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 1302 | Ascent Resources - Marcellus, LLC | | Oil & Gas Operator | Dec 2021 |
| 1303 | Ascent Resources Utica LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 1304 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 1305 | Asg Holdings LLC | Colorado Springs, CO 80907 | Oil Operator | Nov 2009 |
| 1306 | Ash Donald D Oil | | Oil & Gas Operator | Feb 1986 |
| 1307 | Ash Exploration, Inc. | | Oil & Gas Operator | Apr 2010 |
| 1308 | Ash, Wiley R., Jr. | Andover, KS 67002 | Oil & Gas Operator | Mar 1990 |
| 1309 | Ash-Bie Oil Co | Ellis, KS 67637 | Oil Operator | Nov 1998 |
| 1310 | Ashbrook Oil Co. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2020 |
| 1311 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 1312 | Ashcraft James C | Frazeysburg, OH 43822 | Oil Operator | Dec 1997 |
| 1313 | Ashe Oil Company | Scio, NY 14880 | Oil Operator | Dec 2025 |
| 1314 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 1315 | Asher Associates, Inc. | Centennial, CO 80112 | Oil Operator | Aug 2016 |
| 1316 | Asher Enterprises LTD. Co. | Denton, TX 76210 | Oil & Gas Operator | Nov 2023 |
| 1317 | Asher Oil Co | Artesia, NM 88210 | Oil & Gas Operator | Aug 1995 |
| 1318 | Asher Oil LLC | Irving, TX 75038 | Oil & Gas Operator | Feb 2026 |
| 1319 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 1320 | Asher Tip Corporation | Fairfax, OK 74637-0308 | Oil & Gas Operator | Nov 2003 |
| 1321 | Ashford, Jerry | Caney, KS 67333 | Oil Operator | Aug 1992 |
| 1322 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 1323 | Ashland Exploration Properties Inc | | Gas Operator | Dec 1996 |
| 1324 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 1325 | Ashlawn Corporation | | Oil & Gas Operator | Dec 2008 |
| 1326 | Ashlawn Energy, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1327 | Ashley Jim Company (The) | Broken Arrow, OK 74012 | Oil Operator | Apr 2026 |
| 1328 | Ashley Valley Operating Company LLC | Orem, UT 84097 | Oil & Gas Operator | Oct 2025 |
| 1329 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 1330 | Ashlock True | | Oil Operator | Nov 1987 |
| 1331 | Ashlock, Beryl Roderick | Virgil, KS 66870 | Oil Operator | Dec 2019 |
| 1332 | Ashlock, Edd | Neal, KS 66863 | Oil Operator | Dec 1986 |
| 1333 | Ashlock, Ernest H. | Overland Park, KS 66202 | Oil Operator | Jun 1987 |
| 1334 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2026 |
| 1335 | Ashtola Prod Co | Valley Forge, PA 19482-0858 | Gas Operator | Dec 1986 |
| 1336 | Ashton Oil & Gas, Inc. | | Oil Operator | Jun 1990 |
| 1337 | Ashuca | | Oil Operator | Feb 1998 |
| 1338 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 1339 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 1340 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 1341 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2026 |
| 1342 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1343 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1344 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1345 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1346 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1347 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1348 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1349 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1350 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1351 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1352 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2026 |
| 1353 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1354 | Asphalta LLC | | Oil & Gas Operator | Jul 2026 |
| 1355 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1356 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1357 | Assent Energy Partners, LLC | College Sta, TX 77842 | Oil & Gas Operator | Sep 2026 |
| 1358 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1359 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Jul 2026 |
| 1360 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1361 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1362 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1363 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1364 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1365 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1366 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1367 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Dec 2025 |
| 1368 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 1369 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 1370 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Sep 2026 |
| 1371 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 1372 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 1373 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Sep 2026 |
| 1374 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 1375 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 1376 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2026 |
| 1377 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 1378 | Atex Exploration & Operating Co. | Whitesboro, TX 76273 | Oil & Gas Operator | Sep 2026 |
| 1379 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 1380 | Atha Edward E | Athens, OH 45701 | Oil & Gas Operator | Dec 1987 |
| 1381 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 1382 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Jul 2026 |
| 1383 | Athanor Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 1384 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 1385 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Sep 2026 |
| 1386 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Sep 2026 |
| 1387 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 1388 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 1389 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 1390 | Atibara Operating, LLC | New Braunfels, TX 78130 | Oil Operator | Sep 2026 |
| 1391 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1392 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 1393 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Sep 2026 |
| 1394 | Atkins Production | | Oil Operator | Dec 2008 |
| 1395 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 1396 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 1397 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Sep 2026 |
| 1398 | Atkinson WM H Estate | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2001 |
| 1399 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 1400 | Atkinson, Jim | Nocona, TX 76255 | Oil & Gas Operator | Sep 2026 |