| 201 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 202 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 203 | Reynolds, Richard | Seymour, TX 76380 | Oil & Gas Operator | Mar 2008 |
| 204 | RHB Exploration & Production,LLC | Grapevine, TX 76099 | Oil & Gas Operator | Dec 2025 |
| 205 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 206 | Rio Bravo Production, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 207 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 208 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 209 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 210 | RJM Oil Company, LLC | Irving, TX 75060 | Oil Operator | Dec 2025 |
| 211 | Ryan, Joseph G. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 212 | Ryder Scott Management, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2018 |
| 213 | S & H Oil Company | Vernon, TX 76384 | Oil & Gas Operator | Sep 1999 |
| 214 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 215 | S & S Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Aug 1998 |
| 216 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 217 | S.U.E. Company | Abilene, TX 79604 | Oil Operator | Jan 1998 |
| 218 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 219 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 220 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 221 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 222 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 223 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 224 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 225 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 226 | Schalk, Thomas S. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 1995 |
| 227 | Schiff, H. G. & Co. | Dallas, TX 75206 | Oil & Gas Operator | Jul 1993 |
| 228 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 229 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 230 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 231 | Sheneeda Energy, LLC | O Brien, TX 79539 | Oil Operator | Jun 2025 |
| 232 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Dec 2025 |
| 233 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 234 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 235 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 236 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Dec 2025 |
| 237 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 238 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 239 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 240 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 241 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 242 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 243 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 244 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Dec 2025 |
| 245 | Steinberger, Gerald | Windthorst, TX 76389 | Oil & Gas Operator | Sep 2007 |
| 246 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 247 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 248 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 249 | Stowe Energy, Inc. | Vernon, TX 76384 | Oil & Gas Operator | Mar 2003 |
| 250 | Strange, D. D. | Archer City, TX 76351 | Oil & Gas Operator | Sep 2014 |
| 251 | Success Oil Company, Inc. | Beverly Hills, CA 90211 | Oil & Gas Operator | Dec 2025 |
| 252 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 253 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 254 | T Dozer D Oil Co. | Goree, TX 76363 | Oil & Gas Operator | Dec 2025 |
| 255 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 256 | Talon Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 257 | Taylor Oil & Gas Serv | Snyder, TX 79549 | Oil Operator | Dec 2025 |
| 258 | TB Petroleum, LLC | Petrolia, TX 76377 | Oil & Gas Operator | Dec 2025 |
| 259 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 260 | Teal Exploration, LLC | Abilene, TX 79602 | Oil Operator | Dec 2025 |
| 261 | Texas Land & Petro Co., LLC | Carrollton, TX 75010 | Oil & Gas Operator | Dec 2025 |
| 262 | Texas State Oil Co. | Irving, TX 75062 | Oil & Gas Operator | Mar 2017 |
| 263 | Texcel Exploration, Inc. | Colorado SPGS, CO 80960 | Oil & Gas Operator | Dec 2025 |
| 264 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 265 | THP Operating LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Dec 2025 |
| 266 | Throckmorton Oil, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 267 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Dec 2025 |
| 268 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 269 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 270 | Treco Oil Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 271 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 272 | Tri Energy Resources, Inc. | Norman, OK 73070 | Oil Operator | Dec 2025 |
| 273 | United Energy Partners, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 274 | United Operating Company | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 275 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 276 | Vista Energy Corp. | Good Lettsvle, TN 37072 | Oil & Gas Operator | Dec 2025 |
| 277 | Vista Exploration, LLC | Abilene, TX 79601 | Oil & Gas Operator | May 2017 |
| 278 | VX Operating, LLC | Abilene, TX 79605 | Oil & Gas Operator | Dec 2025 |
| 279 | W.T. Waggoner Estate, Inc. | Vernon, TX 76385 | Oil Operator | Dec 2025 |
| 280 | Waco Petro, LP | Sulphur SPGS, TX 75483 | Oil Operator | Sep 2015 |
| 281 | Waggoner Operating, L.L.C. | Vernon, TX 76385 | Oil Operator | Dec 2025 |
| 282 | Waggoner, Ralph E. | Windthorst, TX 76389 | Oil & Gas Operator | Dec 2010 |
| 283 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 284 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 285 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 286 | Westico Energy Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2004 |
| 287 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 288 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 289 | Whitfield Energy | Midland, TX 79702 | Oil & Gas Operator | Jan 1999 |
| 290 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 291 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 292 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 293 | Winco Oil Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 294 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 295 | Wolf, Gene | Windthorst, TX 76389 | Oil & Gas Operator | Apr 2003 |
| 296 | Wolfson, I. J. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2002 |
| 297 | Wortham Operating, LLC | Holliday, TX 76366 | Oil & Gas Operator | Apr 2023 |
| 298 | Wortham, E. H. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 299 | Xplore Operating, LLC | Arlington, TX 76001 | Oil & Gas Operator | Dec 2025 |
| 300 | Yarberry, E. E. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2015 |