| 27401 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Dec 2024 |
| 27402 | Sissom Oil | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 27403 | Sissom Oil Field Services, LLC | Graham, TX 76450 | Oil Operator | Apr 2025 |
| 27404 | Sisters Of St. Joseph | Clarence, NY 14031 | Gas Operator | Dec 2023 |
| 27405 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 27406 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 27407 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 27408 | Situs Oil & Gas, LLC | Corpus Chrsti, TX 78414 | Oil Operator | Apr 2025 |
| 27409 | Sitwell, Inc. | | Oil Operator | May 2022 |
| 27410 | Sivad Energy No 4 | Akron, NY 14001 | Gas Operator | Dec 2023 |
| 27411 | Siven Crude Oil Company | Lomita, CA 90717 | Oil & Gas Operator | Apr 2018 |
| 27412 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 27413 | Six Bar Oil LLC | Pine Haven, WY 82721 | Oil & Gas Operator | Feb 2025 |
| 27414 | Six C Oil | Bowie, TX 76230 | Oil & Gas Operator | Sep 2011 |
| 27415 | Six Oil Producers | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 27416 | Six-D Exploration, LLC | Hutchinson, KS 67502 | Oil Operator | Aug 2024 |
| 27417 | Six-S Properties, Inc. | Austin, TX 78767 | Oil & Gas Operator | Apr 2025 |
| 27418 | Sixess Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 27419 | Sizemore, James | Hardin, TX 77561 | Oil & Gas Operator | Jun 2003 |
| 27420 | SJ Energy, LLC | Englewood, CO 80112 | Oil & Gas Operator | Feb 2019 |
| 27421 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Dec 2024 |
| 27422 | SJM Inc | Tulsa, OK 74133-1757 | Gas Operator | Apr 2006 |
| 27423 | SJM Oil LLC | | Oil & Gas Operator | Dec 2009 |
| 27424 | Sju Holdings LLC | Norman, OK 73072 | Oil & Gas Operator | Jan 2025 |
| 27425 | SK Nemaha LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Feb 2021 |
| 27426 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2024 |
| 27427 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Jan 2025 |
| 27428 | Skaar, K. M. Oil & Gas Co. | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 27429 | Skaer Properties LTD Partnership | | Oil & Gas Operator | Jun 2013 |
| 27430 | Skaggs Resources LLC | Sapulpa, OK 74066-7930 | Oil Operator | Jan 2025 |
| 27431 | Skeet Oil Production LLC | Grady, OK 73569 | Oil Operator | Feb 2025 |
| 27432 | Skeeter Oil L.L.C. | Big Spring, TX 79720 | Oil Operator | Apr 2025 |
| 27433 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 27434 | Skelton Operating Co., Inc. | | Oil & Gas Operator | Aug 1980 |
| 27435 | Skelton, D.W. | | Oil Operator | Dec 1952 |
| 27436 | Skewes Operating Company | Bluefield, VA 24605 | Oil & Gas Operator | Apr 2025 |
| 27437 | Ski Production, LLC | Muenster, TX 76252 | Oil Operator | Apr 2025 |
| 27438 | Skidgel Enterprises Inc | Rawlins, WY 82301 | Oil & Gas Operator | Sep 2018 |
| 27439 | Skidmore Energy,Inc. | Salado, TX 76571 | Oil & Gas Operator | Jun 1999 |
| 27440 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 27441 | Skidmore, James E. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2008 |
| 27442 | Skinner Cattle, Inc. | Nocona, TX 76255 | Oil Operator | Apr 2025 |
| 27443 | Skinner Corporation | | Oil Operator | Apr 1985 |
| 27444 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 27445 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 27446 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |
| 27447 | Skinner, Robert V. | Spearman, TX 79081 | Oil & Gas Operator | Aug 2008 |
| 27448 | Skinner, W. E. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2025 |
| 27449 | Skinnergy Co. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 27450 | Skip'S Oilfield Service | Pawhuska, OK 74056 | Oil & Gas Operator | Jan 2006 |
| 27451 | Skipworth, Joseph D | | Oil Operator | Dec 2021 |
| 27452 | SKKM Oil Company | | Oil Operator | Dec 1992 |
| 27453 | Sklar | | Oil & Gas Operator | Dec 2024 |
| 27454 | Sklar & Phillips - Harry Hurt | | Oil & Gas Operator | Jul 1986 |
| 27455 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 27456 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |
| 27457 | Sklar &Phillips-Great Southern | | Oil & Gas Operator | Aug 1980 |
| 27458 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2025 |
| 27459 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 27460 | Skora, James B. | Lawtons, NY 14091 | Gas Operator | Dec 2023 |
| 27461 | Skrivanos Engineering, Inc. | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2011 |
| 27462 | Skrzynski, Thomas J. | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 27463 | SKS Oil | Olney, TX 76374 | Oil & Gas Operator | Apr 2025 |
| 27464 | Skubis, Daniel J. | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 27465 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Nov 2024 |
| 27466 | Skull Creel Oil & Gas LLC | Bartlesville, OK 74005 | Oil Operator | Nov 2024 |
| 27467 | Sky Development Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 27468 | Sky Oil, L.L.C. | St. Paul, KS 66771 | Oil Operator | Dec 2004 |
| 27469 | Sky Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 27470 | Skybox, LLC | | Gas Operator | Dec 2021 |
| 27471 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 27472 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 27473 | Skye MS, LLC | | Oil & Gas Operator | Jan 2025 |
| 27474 | Skyhawk Energy, LLC | | Oil Operator | Dec 2024 |
| 27475 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 27476 | Skyline Operating Company, LLC | Alpine, UT 84004 | Oil & Gas Operator | Jan 2025 |
| 27477 | Skyliner Energy LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2024 |
| 27478 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | Apr 2025 |
| 27479 | Skyway Energy LLC | Leesburg, OH 34748 | Oil & Gas Operator | Dec 2020 |
| 27480 | SKZ Inc. | | Oil Operator | Mar 1988 |
| 27481 | SL Petroleum LLC | Edmond, OK 73013-8801 | Oil & Gas Operator | Apr 2022 |
| 27482 | Slack Oil & Gas | Refugio, TX 78377 | Oil & Gas Operator | Dec 2012 |
| 27483 | Slack, R. C. | Pecos, TX 79772 | Oil & Gas Operator | Jul 2000 |
| 27484 | Slagel, H. P. Prod. Co. | Snyder, TX 79550 | Oil & Gas Operator | Dec 2006 |
| 27485 | Slam Resources, Inc. | | Oil & Gas Operator | Apr 1994 |
| 27486 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2025 |
| 27487 | Slapco - Emerald Exploration | | Gas Operator | Sep 1979 |
| 27488 | Slape Oil Company, Inc. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 27489 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2025 |
| 27490 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 27491 | Slatex Well Service, Inc. | Batson, TX 77519 | Oil Operator | Apr 2025 |
| 27492 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 27493 | Slaughter, Norman C. | | Oil & Gas Operator | Dec 2012 |
| 27494 | Slavens II Paul R | Tulsa, OK 74131-2244 | Oil & Gas Operator | Jan 2025 |
| 27495 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 27496 | Slawson Explorat | | Oil & Gas Operator | Dec 1996 |
| 27497 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 27498 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2024 |
| 27499 | Slayton Resources Inc | Roswell, NM 88202 | Oil & Gas Operator | Feb 2025 |
| 27500 | Sledge Bros. Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Mar 2016 |