| 26401 | Sipple Oil Co | Beattyville, KY 41311 | Oil Operator | Dec 2012 |
| 26402 | Sirius Energy Corp. | Abilene, TX 79606 | Oil Operator | Dec 2009 |
| 26403 | Siroco Operating Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2010 |
| 26404 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 26405 | Sissom Oil | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 26406 | Sissom Oil Field Services, LLC | Graham, TX 76450 | Oil Operator | Apr 2026 |
| 26407 | Sisters Of St. Joseph | Clarence, NY 14031 | Gas Operator | Dec 2024 |
| 26408 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 26409 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 26410 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 26411 | Situs Oil & Gas, LLC | Corpus Chrsti, TX 78414 | Oil Operator | Apr 2026 |
| 26412 | Sitwell, Inc. | | Oil Operator | May 2022 |
| 26413 | Sivad Energy No 4 | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 26414 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 26415 | Six Bar Oil LLC | Pine Haven, WY 82721 | Oil & Gas Operator | Feb 2026 |
| 26416 | Six C Oil | Bowie, TX 76230 | Oil & Gas Operator | Sep 2011 |
| 26417 | Six Oil Producers | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 26418 | Six-D Exploration, LLC | Hutchinson, KS 67502 | Oil Operator | Apr 2025 |
| 26419 | Six-S Properties, Inc. | Austin, TX 78767 | Oil & Gas Operator | Apr 2026 |
| 26420 | Sixess Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 26421 | Sizemore, James | Hardin, TX 77561 | Oil & Gas Operator | Jun 2003 |
| 26422 | SJ Energy, LLC | Englewood, CO 80112 | Oil & Gas Operator | Feb 2019 |
| 26423 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Oct 2025 |
| 26424 | SJM Inc | Tulsa, OK 74133-1757 | Gas Operator | Apr 2006 |
| 26425 | SJM Oil LLC | | Oil & Gas Operator | Dec 2009 |
| 26426 | Sju Holdings LLC | Norman, OK 73072 | Oil & Gas Operator | Dec 2025 |
| 26427 | SK Nemaha LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Feb 2021 |
| 26428 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2025 |
| 26429 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Dec 2025 |
| 26430 | Skaar, K. M. Oil & Gas Co. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 26431 | Skeet Oil Production LLC | Grady, OK 73569 | Oil Operator | Dec 2025 |
| 26432 | Skeeter Oil L.L.C. | Big Spring, TX 79720 | Oil Operator | Apr 2026 |
| 26433 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 26434 | Skelton Operating Co., Inc. | | Oil & Gas Operator | Aug 1980 |
| 26435 | Skelton, D.W. | | Oil Operator | Dec 1952 |
| 26436 | Skewes Operating Company | Bluefield, VA 24605 | Oil & Gas Operator | Apr 2026 |
| 26437 | Ski Production, LLC | Muenster, TX 76252 | Oil Operator | Apr 2026 |
| 26438 | Skidgel Enterprises Inc | Rawlins, WY 82301 | Oil & Gas Operator | Sep 2018 |
| 26439 | Skidmore Energy,Inc. | Salado, TX 76571 | Oil & Gas Operator | Jun 1999 |
| 26440 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 26441 | Skidmore, James E. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2008 |
| 26442 | Skinner Cattle, Inc. | Nocona, TX 76255 | Oil Operator | Apr 2026 |
| 26443 | Skinner Corporation | | Oil Operator | Apr 1985 |
| 26444 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 26445 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 26446 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |
| 26447 | Skinner, Robert V. | Spearman, TX 79081 | Oil & Gas Operator | Aug 2008 |
| 26448 | Skinner, W. E. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 26449 | Skinnergy Co. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2026 |
| 26450 | Skipworth, Joseph D | | Oil Operator | Dec 2021 |
| 26451 | SKKM Oil Company | | Oil Operator | Dec 1992 |
| 26452 | Sklar | | Oil & Gas Operator | Dec 2024 |
| 26453 | Sklar & Phillips - Harry Hurt | | Oil & Gas Operator | Jul 1986 |
| 26454 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 26455 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |
| 26456 | Sklar &Phillips-Great Southern | | Oil & Gas Operator | Aug 1980 |
| 26457 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2026 |
| 26458 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 26459 | Skora, James B. | Lawtons, NY 14091 | Gas Operator | Dec 2024 |
| 26460 | Skrivanos Engineering, Inc. | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2011 |
| 26461 | Skrzynski, Thomas J. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 26462 | SKS Oil | Olney, TX 76374 | Oil & Gas Operator | Apr 2026 |
| 26463 | Skubis, Daniel J. | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 26464 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Feb 2026 |
| 26465 | Skull Creek Oil & Gas LLC | | Oil Operator | Nov 2025 |
| 26466 | Sky Development Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 26467 | Sky Oil, L.L.C. | St. Paul, KS 66771 | Oil Operator | Dec 2004 |
| 26468 | Sky Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 26469 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2026 |
| 26470 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2026 |
| 26471 | Skye MS, LLC | | Oil & Gas Operator | Feb 2026 |
| 26472 | Skyhawk Energy, LLC | | Oil Operator | Dec 2024 |
| 26473 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 26474 | Skyline Operating Company, LLC | Alpine, UT 84004 | Oil & Gas Operator | Dec 2025 |
| 26475 | Skyliner Energy LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2025 |
| 26476 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | Apr 2026 |
| 26477 | Skyway Energy LLC | Leesburg, OH 34748 | Oil & Gas Operator | Dec 2020 |
| 26478 | SKZ Inc. | | Oil Operator | Mar 1988 |
| 26479 | Slack Oil & Gas | Refugio, TX 78377 | Oil & Gas Operator | Dec 2012 |
| 26480 | Slack, R. C. | Pecos, TX 79772 | Oil & Gas Operator | Jul 2000 |
| 26481 | Slagel, H. P. Prod. Co. | Snyder, TX 79550 | Oil & Gas Operator | Dec 2006 |
| 26482 | Slam Resources, Inc. | | Oil & Gas Operator | Apr 1994 |
| 26483 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2026 |
| 26484 | Slapco - Emerald Exploration | | Gas Operator | Sep 1979 |
| 26485 | Slape Oil Company, Inc. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 26486 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2026 |
| 26487 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 26488 | Slatex Well Service, Inc. | Batson, TX 77519 | Oil Operator | Apr 2026 |
| 26489 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 26490 | Slaughter, Norman C. | | Oil & Gas Operator | Dec 2012 |
| 26491 | Slavens II Paul R | Tulsa, OK 74131 | Oil & Gas Operator | Dec 2025 |
| 26492 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 26493 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 26494 | Slawson Explorat | | Oil & Gas Operator | Dec 1996 |
| 26495 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 26496 | Slayton Resources Inc | Roswell, NM 88202 | Oil & Gas Operator | Jan 2026 |
| 26497 | Sledge Bros. Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Mar 2016 |
| 26498 | Sledge Olen | Duncan, OK 73533 | Oil Operator | Nov 2025 |
| 26499 | Sledge, H. G., Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2016 |
| 26500 | Sleeth And Brooks Oil Co. | | Oil Operator | Jul 1989 |