| 401 | Sugar Creek Producing Company | | Oil & Gas Operator | Dec 2010 |
| 402 | Sugar Creek Producing Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 403 | Summit Energy,Inc | Littleton, CO 80127 | Oil & Gas Operator | Aug 2013 |
| 404 | Summit Gas LLC | | Oil & Gas Operator | Oct 2011 |
| 405 | Sun Exploration And Production Co | | Oil & Gas Operator | Jan 1990 |
| 406 | Sundance Energy Corporation | | Oil & Gas Operator | Jan 2025 |
| 407 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 408 | Swan Lake Properties, Inc. | | Oil Operator | Jul 1987 |
| 409 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 410 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 411 | Taggart Oil Co., Inc. | | Oil Operator | Oct 1992 |
| 412 | Tellurian Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 413 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 414 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 415 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Jun 2026 |
| 416 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 417 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 418 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 419 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 420 | Texas Gas Transmission, LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 421 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 422 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 423 | Texex Petroleum Corporation | | Oil & Gas Operator | Dec 2024 |
| 424 | Tigner Walker | | Oil & Gas Operator | Dec 2021 |
| 425 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 426 | Tma Production, LLC | | Oil Operator | Dec 2024 |
| 427 | TNC Energy, LLC | Lubbock, TX 79401 | Oil & Gas Operator | Nov 2016 |
| 428 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 429 | Trickle Down Oil, Inc. | | Oil & Gas Operator | Feb 2016 |
| 430 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 431 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 432 | Txo Production Corp/Amh O&G Co | | Oil & Gas Operator | Dec 1990 |
| 433 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 434 | U S Liquids Of La., L.P. | | Oil Operator | Apr 2014 |
| 435 | Union Expl. Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
| 436 | United Investment Group | | Oil Operator | Nov 2004 |
| 437 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 438 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jun 2026 |
| 439 | Vaughn Petroleum, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2004 |
| 440 | Vector Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Jun 2026 |
| 441 | Venture Oil & Gas Inc. | Laurel, MS 39440 | Oil & Gas Operator | Mar 2026 |
| 442 | Vernon E. Faulconer | | Oil & Gas Operator | Dec 1996 |
| 443 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 444 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 445 | Vista Corporation | | Oil & Gas Operator | Jan 2011 |
| 446 | W&S Energy LLC | Woodward, OK 73801 | Oil & Gas Operator | Sep 2022 |
| 447 | W. Harlan Beene | | Oil Operator | Jan 2025 |
| 448 | W. Harlan Beene Et Al | | Oil Operator | Dec 2002 |
| 449 | Watson Oil Corporation | | Oil & Gas Operator | Jun 1981 |
| 450 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 451 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 452 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2026 |
| 453 | William D. Pittman | | Oil & Gas Operator | Jun 1991 |
| 454 | Williamson Pumping Ser., Inc. | | Oil Operator | Nov 2024 |
| 455 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 456 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 457 | Windrush Operating Company | | Oil & Gas Operator | Jan 2009 |
| 458 | WLS Corporation | | Oil Operator | Aug 2009 |
| 459 | WSF, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2013 |
| 460 | Wytex Production Corporation | Fort Smith, AR 72903 | Oil & Gas Operator | Feb 2026 |
| 461 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 462 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 463 | Xtra Energy Corporation | | Oil & Gas Operator | Jun 1989 |
| 464 | Yellow Dog Oil Company | | Oil Operator | Apr 1988 |
| 465 | Zeagler Enterprises, Inc. | | Oil & Gas Operator | Jun 2008 |