| 10301 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 10302 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 10303 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 10304 | South Texas SWD, Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 10305 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 10306 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 10307 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 10308 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 10309 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 10310 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 10311 | Southerland, Glenn Oil & Gas Co. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 2021 |
| 10312 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Oct 2025 |
| 10313 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 10314 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 10315 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 10316 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 10317 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 10318 | Southern Oil & Gas LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 10319 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Oct 2025 |
| 10320 | Southern Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 10321 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 10322 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 10323 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Oct 2025 |
| 10324 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 10325 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Oct 2025 |
| 10326 | Southlake Operating LLC | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2025 |
| 10327 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 10328 | Southland Royalty Co.-Midland | Midland, TX 79702 | Oil & Gas Operator | Mar 1996 |
| 10329 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 10330 | Southridge Operating Company | San Marcos, TX 78667 | Oil & Gas Operator | Oct 2025 |
| 10331 | Southstar Energy Corporation | Ardmore, OK 73401 | Gas Operator | Aug 1990 |
| 10332 | Southstone Energy, LLC | Austin, TX 78735 | Oil Operator | Oct 2025 |
| 10333 | Southwest Energy Devel.,Inc. | Sugar Land, TX 77478 | Oil & Gas Operator | Jul 2007 |
| 10334 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | Oct 2025 |
| 10335 | Southwest Gathering Company | Alice, TX 78332 | Oil & Gas Operator | Oct 2025 |
| 10336 | Southwest Investment Fund, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Aug 2003 |
| 10337 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |
| 10338 | Southwest Loop 1604, LTD. | San Antonio, TX 78209 | Oil Operator | Sep 2022 |
| 10339 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 10340 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Oct 2025 |
| 10341 | Southwest Petroleum | San Antonio, TX 78253 | Oil & Gas Operator | Oct 2025 |
| 10342 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 10343 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 10344 | Southwest-Operating | Penwell, TX 79776 | Oil & Gas Operator | Oct 2025 |
| 10345 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 10346 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 10347 | Sovereign Petroleum Company, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2013 |
| 10348 | Sozo Natural Resources LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 10349 | Space Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 10350 | Spade Energy L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | Oct 2025 |
| 10351 | Spain Oil Company | Somerset, TX 78069 | Oil & Gas Operator | Oct 2025 |
| 10352 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 10353 | Sparks, Sidney A., Trustee | Alice, TX 78332 | Oil & Gas Operator | Jun 1996 |
| 10354 | Sparta Exploration LLC | Houston, TX 77279 | Oil & Gas Operator | Oct 2025 |
| 10355 | Spartagus Corporation | Grand Saline, TX 75140 | Oil & Gas Operator | Sep 2004 |
| 10356 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 10357 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 10358 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 10359 | Spear Production Company, Inc. | Shreveport, LA 71161 | Oil Operator | Oct 2025 |
| 10360 | Spearco Oil | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |
| 10361 | Speartex Grain Company | Gruver, TX 79040 | Oil & Gas Operator | Oct 2025 |
| 10362 | Speartip Energy, LLC | Katy, TX 77450 | Oil Operator | Oct 2025 |
| 10363 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 10364 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Oct 2025 |
| 10365 | Spectral Oil & Gas Corporation | Humble, TX 77338 | Oil Operator | Oct 2025 |
| 10366 | Speed, F. Michael, Trustee | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 1998 |
| 10367 | Speegle Oil And Gas Company | Longview, TX 75605 | Oil & Gas Operator | Oct 2025 |
| 10368 | Speller Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Jun 2025 |
| 10369 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 10370 | Spence, Ralph Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2023 |
| 10371 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Jun 2025 |
| 10372 | Spencer-Cloughly Investments Inc | San Marcos, TX 78666 | Oil & Gas Operator | Aug 2002 |
| 10373 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 10374 | SPH Development, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2022 |
| 10375 | Spheric Petroleum Inc. | Baltimore, MD 21208 | Oil & Gas Operator | Nov 2006 |
| 10376 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 10377 | Spicer Oil Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2008 |
| 10378 | Spicewood Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 10379 | Spicknall Enterprises | Amarillo, TX 79124 | Oil & Gas Operator | May 1998 |
| 10380 | Spikes, Harry | Henrietta, TX 76365 | Oil & Gas Operator | Sep 2000 |
| 10381 | Spiller Oil & Gas Company | Jacksboro, TX 76458 | Oil Operator | Oct 2025 |
| 10382 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 10383 | Spiller, H. G. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1993 |
| 10384 | Spiller, J. A. Company | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 10385 | Spiller, J.A. | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 10386 | Spiller, Joseph A. | Austin, TX 78746 | Oil & Gas Operator | Oct 1993 |
| 10387 | Spiller, Robert S. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1995 |
| 10388 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 10389 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 10390 | Spinnaker Exploration Co.,L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Nov 2005 |
| 10391 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 10392 | Spirit Energy L.L.C. | Caddo Mills, TX 75135 | Oil & Gas Operator | Dec 2018 |
| 10393 | Spirit O&G Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 10394 | Spitfire Partners, LLC | Dallas, TX 75225 | Oil Operator | Oct 2025 |
| 10395 | Spivey, R. L. | Olney, TX 76374 | Oil Operator | Jul 2005 |
| 10396 | Sponte Operating, Inc. | Dallas, TX 75313 | Oil & Gas Operator | Oct 2025 |
| 10397 | Spoonemore Brothers | Spearman, TX 79081 | Oil & Gas Operator | Nov 2019 |
| 10398 | Sportsman Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Nov 1998 |
| 10399 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 10400 | Spri Oil & Gas, LLC | Houston, TX 77090 | Oil & Gas Operator | Mar 2020 |