| 10401 | South Oil, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 10402 | South Sam Operating Company, LLC | Lakehills, TX 78063 | Oil Operator | Dec 2025 |
| 10403 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 10404 | South Texas Energy Production | Devine, TX 78016 | Oil & Gas Operator | Dec 1996 |
| 10405 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 10406 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 10407 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 10408 | South Texas SWD, Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 10409 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 10410 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 10411 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 10412 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 10413 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 10414 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 10415 | Southerland, Glenn Oil & Gas Co. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 2021 |
| 10416 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Dec 2025 |
| 10417 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 10418 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 10419 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 10420 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 10421 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 10422 | Southern Oil & Gas LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 10423 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Dec 2025 |
| 10424 | Southern Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 10425 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 10426 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 10427 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Dec 2025 |
| 10428 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 10429 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 10430 | Southlake Operating LLC | Weatherford, TX 76086 | Oil & Gas Operator | Dec 2025 |
| 10431 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 10432 | Southland Royalty Co.-Midland | Midland, TX 79702 | Oil & Gas Operator | Mar 1996 |
| 10433 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 10434 | Southridge Operating Company | San Marcos, TX 78667 | Oil & Gas Operator | Dec 2025 |
| 10435 | Southstar Energy Corporation | Ardmore, OK 73401 | Gas Operator | Aug 1990 |
| 10436 | Southstone Energy, LLC | Austin, TX 78735 | Oil Operator | Dec 2025 |
| 10437 | Southwest Energy Devel.,Inc. | Sugar Land, TX 77478 | Oil & Gas Operator | Jul 2007 |
| 10438 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | Dec 2025 |
| 10439 | Southwest Gathering Company | Alice, TX 78332 | Oil & Gas Operator | Dec 2025 |
| 10440 | Southwest Investment Fund, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Aug 2003 |
| 10441 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |
| 10442 | Southwest Loop 1604, LTD. | San Antonio, TX 78209 | Oil Operator | Sep 2022 |
| 10443 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 10444 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 10445 | Southwest Petroleum | San Antonio, TX 78253 | Oil & Gas Operator | Dec 2025 |
| 10446 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Dec 2025 |
| 10447 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 10448 | Southwest-Operating | Penwell, TX 79776 | Oil & Gas Operator | Dec 2025 |
| 10449 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 10450 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 10451 | Sovereign Petroleum Company, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2013 |
| 10452 | Sozo Natural Resources LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 10453 | Space Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 10454 | Spade Energy L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2025 |
| 10455 | Spain Oil Company | Somerset, TX 78069 | Oil & Gas Operator | Dec 2025 |
| 10456 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 10457 | Sparks, Sidney A., Trustee | Alice, TX 78332 | Oil & Gas Operator | Jun 1996 |
| 10458 | Sparta Exploration LLC | Houston, TX 77279 | Oil & Gas Operator | Dec 2025 |
| 10459 | Spartagus Corporation | Grand Saline, TX 75140 | Oil & Gas Operator | Sep 2004 |
| 10460 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 10461 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 10462 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 10463 | Spear Production Company, Inc. | Shreveport, LA 71161 | Oil Operator | Dec 2025 |
| 10464 | Spearco Oil | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |
| 10465 | Speartex Grain Company | Gruver, TX 79040 | Oil & Gas Operator | Dec 2025 |
| 10466 | Speartip Energy, LLC | Katy, TX 77450 | Oil Operator | Dec 2025 |
| 10467 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 10468 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Dec 2025 |
| 10469 | Spectral Oil & Gas Corporation | Humble, TX 77338 | Oil Operator | Dec 2025 |
| 10470 | Speed, F. Michael, Trustee | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 1998 |
| 10471 | Speegle Oil And Gas Company | Longview, TX 75605 | Oil & Gas Operator | Dec 2025 |
| 10472 | Speller Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Aug 2025 |
| 10473 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Dec 2025 |
| 10474 | Spence, Ralph Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2023 |
| 10475 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Aug 2025 |
| 10476 | Spencer-Cloughly Investments Inc | San Marcos, TX 78666 | Oil & Gas Operator | Aug 2002 |
| 10477 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 10478 | SPH Development, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2022 |
| 10479 | Spheric Petroleum Inc. | Baltimore, MD 21208 | Oil & Gas Operator | Nov 2006 |
| 10480 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 10481 | Spicer Oil Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2008 |
| 10482 | Spicewood Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 10483 | Spicknall Enterprises | Amarillo, TX 79124 | Oil & Gas Operator | May 1998 |
| 10484 | Spikes, Harry | Henrietta, TX 76365 | Oil & Gas Operator | Sep 2000 |
| 10485 | Spiller Oil & Gas Company | Jacksboro, TX 76458 | Oil Operator | Dec 2025 |
| 10486 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 10487 | Spiller, H. G. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1993 |
| 10488 | Spiller, J. A. Company | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 10489 | Spiller, J.A. | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 10490 | Spiller, Joseph A. | Austin, TX 78746 | Oil & Gas Operator | Oct 1993 |
| 10491 | Spiller, Robert S. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1995 |
| 10492 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 10493 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 10494 | Spinnaker Exploration Co.,L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Nov 2005 |
| 10495 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 10496 | Spirit Energy L.L.C. | Caddo Mills, TX 75135 | Oil & Gas Operator | Dec 2018 |
| 10497 | Spirit O&G Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 10498 | Spitfire Partners, LLC | Dallas, TX 75225 | Oil Operator | Dec 2025 |
| 10499 | Spivey, R. L. | Olney, TX 76374 | Oil Operator | Jul 2005 |
| 10500 | Sponte Operating, Inc. | Dallas, TX 75313 | Oil & Gas Operator | Dec 2025 |