| 1401 | Skinnergy Co. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 1402 | Skip'S Oilfield Service | Pawhuska, OK 74056 | Oil & Gas Operator | Jan 2006 |
| 1403 | Skipworth, Joseph D | | Oil Operator | Dec 2021 |
| 1404 | SKKM Oil Company | | Oil Operator | Dec 1992 |
| 1405 | Sklar | | Oil & Gas Operator | Dec 2024 |
| 1406 | Sklar & Phillips - Harry Hurt | | Oil & Gas Operator | Jul 1986 |
| 1407 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 1408 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |
| 1409 | Sklar &Phillips-Great Southern | | Oil & Gas Operator | Aug 1980 |
| 1410 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2025 |
| 1411 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 1412 | Skora, James B. | Lawtons, NY 14091 | Gas Operator | Dec 2023 |
| 1413 | Skrivanos Engineering, Inc. | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2011 |
| 1414 | Skrzynski, Thomas J. | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 1415 | SKS Oil | Olney, TX 76374 | Oil & Gas Operator | Apr 2025 |
| 1416 | Skubis, Daniel J. | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 1417 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Nov 2024 |
| 1418 | Skull Creel Oil & Gas LLC | Bartlesville, OK 74005 | Oil Operator | Nov 2024 |
| 1419 | Sky Development Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 1420 | Sky Oil, L.L.C. | St. Paul, KS 66771 | Oil Operator | Dec 2004 |
| 1421 | Sky Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 1422 | Skybox, LLC | | Gas Operator | Dec 2021 |
| 1423 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 1424 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 1425 | Skye MS, LLC | | Oil & Gas Operator | Jan 2025 |
| 1426 | Skyhawk Energy, LLC | | Oil Operator | Dec 2024 |
| 1427 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 1428 | Skyline Operating Company, LLC | Alpine, UT 84004 | Oil & Gas Operator | Jan 2025 |
| 1429 | Skyliner Energy LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2024 |
| 1430 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | Apr 2025 |
| 1431 | Skyway Energy LLC | Leesburg, OH 34748 | Oil & Gas Operator | Dec 2020 |
| 1432 | SKZ Inc. | | Oil Operator | Mar 1988 |
| 1433 | SL Petroleum LLC | Edmond, OK 73013-8801 | Oil & Gas Operator | Apr 2022 |
| 1434 | Slack Oil & Gas | Refugio, TX 78377 | Oil & Gas Operator | Dec 2012 |
| 1435 | Slack, R. C. | Pecos, TX 79772 | Oil & Gas Operator | Jul 2000 |
| 1436 | Slagel, H. P. Prod. Co. | Snyder, TX 79550 | Oil & Gas Operator | Dec 2006 |
| 1437 | Slam Resources, Inc. | | Oil & Gas Operator | Apr 1994 |
| 1438 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2025 |
| 1439 | Slapco - Emerald Exploration | | Gas Operator | Sep 1979 |
| 1440 | Slape Oil Company, Inc. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 1441 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2025 |
| 1442 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 1443 | Slatex Well Service, Inc. | Batson, TX 77519 | Oil Operator | Apr 2025 |
| 1444 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 1445 | Slaughter, Norman C. | | Oil & Gas Operator | Dec 2012 |
| 1446 | Slavens II Paul R | Tulsa, OK 74131-2244 | Oil & Gas Operator | Jan 2025 |
| 1447 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 1448 | Slawson Explorat | | Oil & Gas Operator | Dec 1996 |
| 1449 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 1450 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2024 |
| 1451 | Slayton Resources Inc | Roswell, NM 88202 | Oil & Gas Operator | Jan 2025 |
| 1452 | Sledge Bros. Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Mar 2016 |
| 1453 | Sledge Olen | Duncan, OK 73533 | Oil Operator | Nov 2024 |
| 1454 | Sledge, H. G., Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2016 |
| 1455 | Sleeth And Brooks Oil Co. | | Oil Operator | Jul 1989 |
| 1456 | Slick Inc. | MC Gregor, TX 76657 | Oil Operator | Apr 2025 |
| 1457 | Slick Production Inc | Tulsa, OK 74132-1718 | Oil & Gas Operator | Apr 2020 |
| 1458 | Slick Production, LLC | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 1459 | Slik-Dril P & A Inc | | Oil & Gas Operator | Sep 1989 |
| 1460 | Slik-Dril, Inc | | Oil & Gas Operator | Nov 1998 |
| 1461 | Slim Hole Inc | Farmington, NM 87401-7725 | Oil & Gas Operator | May 2013 |
| 1462 | Slingshot Oil & Gas | Houston, TX 77019 | Oil Operator | Apr 2025 |
| 1463 | Slinkard William & Roberta | Pawhuska, OK 74056 | Oil Operator | Jan 2025 |
| 1464 | Sliverville Oil Co LLC | Bradford, PA 16701-2770 | Oil & Gas Operator | Dec 2024 |
| 1465 | SLMW Energy Comp | | Oil Operator | Jan 1989 |
| 1466 | Slo Oil, LLC | El Dorado, KS 67042 | Oil Operator | Nov 2024 |
| 1467 | Sloan Oil Corporation | Humble, TX 77347 | Oil & Gas Operator | Mar 2015 |
| 1468 | Sloan Operations | | Oil Operator | Oct 2024 |
| 1469 | Sloan Petroleum Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 1470 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Feb 2025 |
| 1471 | Sloan Production Co | | Oil Operator | Jan 2013 |
| 1472 | Slohcin, Inc. | Shelby, MT 59474 | Oil Operator | Jan 2025 |
| 1473 | Slone Energy, LLC | Oil Springs, KY 41238 | Oil & Gas Operator | Dec 2023 |
| 1474 | Slone VIctor | Barnsdall, OK 74002 | Oil Operator | Apr 2024 |
| 1475 | Slow Poke Production-George L. Dobson Dba | Cut Bank, MT 59427 | Gas Operator | Dec 2024 |
| 1476 | Slow Stroke Productions LLC | | Oil Operator | Feb 2025 |
| 1477 | SLS Operating LLC | Seminole, OK 74868-5876 | Oil & Gas Operator | Jan 2025 |
| 1478 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Apr 2025 |
| 1479 | SLT Production LLC | Sheffield, PA 16347-0547 | Oil & Gas Operator | Dec 2024 |
| 1480 | Sludge Treating, LLC | Hobbs, NM 88240 | Oil Operator | Jan 2025 |
| 1481 | SM Energy | Denver, CO 80203-4361 | Gas Operator | Feb 2015 |
| 1482 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 1483 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Jan 2025 |
| 1484 | SM Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 1485 | SM&O LLC | | Oil & Gas Operator | Dec 2024 |
| 1486 | Smackco, LTD. | | Oil & Gas Operator | Oct 2002 |
| 1487 | Smackover Drilling Company Inc | Shreveport, LA 71104 | Oil & Gas Operator | Sep 2024 |
| 1488 | Smackover Producing Co | | Oil & Gas Operator | Sep 2024 |
| 1489 | Smackover Shell LTD. Partnership | Houston, TX 77001 | Gas Operator | Apr 2000 |
| 1490 | Smail Denny Lee | Harvey, LA 70058 | Oil & Gas Operator | Dec 2024 |
| 1491 | Smail, James R. | Big Prairie, OH 44611 | Oil & Gas Operator | Dec 1998 |
| 1492 | Smal Energy Corp | Tyler, TX 75710 | Oil & Gas Operator | Oct 1995 |
| 1493 | Small, Louis E. | Angola, NY 14006 | Gas Operator | Dec 2023 |
| 1494 | Small, R.P. Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 1495 | Smalley, Bill | Albany, TX 76430 | Oil & Gas Operator | Jul 2001 |
| 1496 | Smart H D Etal | | Oil Operator | Jan 2006 |
| 1497 | Smart Jr T J | Ryan, OK 73565 | Oil Operator | Sep 1994 |
| 1498 | Smart Service & Equipment LLC | Muskogee, OK 74401-5262 | Oil Operator | Aug 2013 |
| 1499 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 1500 | Sme Well SVC Inc | Herman, PA 16039-0156 | Oil & Gas Operator | Dec 2024 |