| 301 | Precision Drilling Company, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Nov 1995 |
| 302 | Premier Royalties, L.L.C. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 303 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Mar 2025 |
| 304 | Prentice Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Sep 1994 |
| 305 | Pro Oil & Gas Inc | Frankfort, IL 60423 | Oil & Gas Operator | May 2014 |
| 306 | Production Disbursement, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2011 |
| 307 | Prospecta Energy Group, Inc. | Brownwood, TX 76801 | Oil Operator | Mar 2025 |
| 308 | Pruitt Engineering & Petro. Co. | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2007 |
| 309 | Quail Creek Oil Co. | Granbury, TX 76048 | Oil & Gas Operator | Aug 2005 |
| 310 | Quanico Oil & Gas, Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Mar 2025 |
| 311 | Quantum Investments | Lubbock, TX 79424 | Oil Operator | Mar 2025 |
| 312 | Quest Emg, Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 313 | R & D Operating | Early, TX 76803 | Oil & Gas Operator | Mar 2008 |
| 314 | R & D Operating, Inc. | Early, TX 76802 | Oil & Gas Operator | Mar 2025 |
| 315 | R & L Producing Co., Inc. | Hamilton, TX 76531 | Oil & Gas Operator | Nov 1997 |
| 316 | R R Operation Inc | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2004 |
| 317 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 318 | Reach Oil | Brownwood, TX 76801 | Oil & Gas Operator | Mar 2025 |
| 319 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 320 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Mar 2025 |
| 321 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 322 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 323 | Rice Drilling Company | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2025 |
| 324 | Rice, James D. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2007 |
| 325 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 326 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Mar 2025 |
| 327 | Richmond Operating Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2007 |
| 328 | Rico Oil Company | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 329 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 330 | Rimfire Resources, LLC | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 331 | Ringo Rig LLC | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 332 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 333 | Roaring Springs Energy, LTD. | Midland, TX 79702 | Oil & Gas Operator | Feb 2010 |
| 334 | Robertson, T. L. Operating Co. | Cross Plains, TX 76443 | Oil & Gas Operator | May 2004 |
| 335 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 336 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 337 | Rod, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2008 |
| 338 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 339 | Ross Engineering, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 340 | Rough Creek Exploration, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Jan 1996 |
| 341 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 342 | S & V Operating | Zephyr, TX 76890 | Oil & Gas Operator | Mar 2025 |
| 343 | Sandstone Services, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 344 | Santa Anna Operating 3, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2025 |
| 345 | Santa Anna Operating Co I, LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2018 |
| 346 | Saphire Energy | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 347 | Saved By Grace Plugging, LLC | Tuscola, TX 79562 | Oil & Gas Operator | Dec 2018 |
| 348 | Scranton Exploration | Eastland, TX 76448 | Oil & Gas Operator | Mar 2025 |
| 349 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 350 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2025 |
| 351 | Shady Oil Co. | Brownwood, TX 76801 | Oil & Gas Operator | Mar 2025 |
| 352 | Sharpe Energy Company | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 353 | Sherman, L. B. | Early, TX 76803 | Oil & Gas Operator | Jun 1998 |
| 354 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Mar 2025 |
| 355 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 356 | Shumate, Jess | Brookesmith, TX 76827 | Oil Operator | Jun 2006 |
| 357 | Sikes, Arlas M. | Brownwood, TX 76801 | Oil & Gas Operator | May 2000 |
| 358 | Simpson Operating Services, LP | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2025 |
| 359 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Nov 2024 |
| 360 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 361 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Mar 2025 |
| 362 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 363 | Southstone Energy, LLC | Austin, TX 78735 | Oil Operator | Mar 2025 |
| 364 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | Mar 2025 |
| 365 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 366 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 367 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Mar 2025 |
| 368 | Staub, Larry | Richardson, TX 75080 | Oil & Gas Operator | Aug 2003 |
| 369 | Stealth, Inc. | Cross Plains, TX 76443 | Gas Operator | Mar 1997 |
| 370 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 371 | Stewart Productions, LLC | May, TX 76857 | Oil & Gas Operator | Mar 2025 |
| 372 | Stryker Energy Corp. | Mesquite, TX 75180 | Oil & Gas Operator | Mar 2025 |
| 373 | Stuart & Barrett | San Angelo, TX 76904 | Gas Operator | Jan 2008 |
| 374 | Stubblefield Energy Company | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 375 | Sub Surface Operations | Brownwood, TX 76804 | Oil & Gas Operator | Mar 2025 |
| 376 | Subsurface Energy Corp. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 377 | Subsurface Exploration | Coleman, TX 76834 | Oil & Gas Operator | Apr 2006 |
| 378 | Subsurface Production, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 379 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 380 | Sundial Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 381 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 382 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 383 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 384 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Mar 2025 |
| 385 | Talisman Resources, Inc. | Argyle, TX 76226 | Oil & Gas Operator | Mar 1995 |
| 386 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 387 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 388 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 389 | Tayco Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Nov 1996 |
| 390 | Teague Operating Co. | Mabank, TX 75147 | Oil & Gas Operator | Jul 1995 |
| 391 | Tejas Jack Sales, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 392 | Tejas Petroleum Resources, LLC | Aubrey, TX 76227 | Oil & Gas Operator | Mar 2025 |
| 393 | Terrick Resources | Midland, TX 79708 | Oil & Gas Operator | Jul 2005 |
| 394 | Texas Sands Resources, LLC | Abilene, TX 79603 | Oil Operator | Mar 2025 |
| 395 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | Mar 2025 |
| 396 | Texxon Resources, Inc. | Winter Park, FL 32792 | Oil & Gas Operator | Mar 2025 |
| 397 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 398 | THP Operating LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2025 |
| 399 | Thrifty Well Service | Rice, TX 75155 | Oil & Gas Operator | Jun 2009 |
| 400 | Thunderbird Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |