| 201 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | May 2025 |
| 202 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | May 2025 |
| 203 | Oakridge Oil And Gas, LP | Jacksboro, TX 76458 | Oil & Gas Operator | May 2025 |
| 204 | Old Union Operating Company | Austin, TX 78716 | Oil & Gas Operator | May 2025 |
| 205 | Olsan Brothers, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 1994 |
| 206 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 207 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 208 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 209 | Palisades Asset Holding Co LLC | Dallas, TX 75201 | Oil & Gas Operator | Aug 2017 |
| 210 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 211 | Paschal, Phil A. | Kilgore, TX 75662 | Oil Operator | Aug 2021 |
| 212 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 213 | Payola Productions | Athens, TX 75751 | Oil & Gas Operator | Nov 1994 |
| 214 | Perryman Operating Company | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 215 | Petralis Energy Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 216 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 217 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | May 2025 |
| 218 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jul 2024 |
| 219 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | May 2025 |
| 220 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 221 | Platform Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 222 | Potato Creek, L.L.C. | Edna, KS 67342 | Oil & Gas Operator | Jan 2025 |
| 223 | Powell-McCarroll Partnership | Sachse, TX 75048 | Oil & Gas Operator | May 2025 |
| 224 | Publishers Petroleum | Dallas, TX 75219 | Oil & Gas Operator | Aug 2003 |
| 225 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 226 | Quanico Oil & Gas, Inc. | El Dorado, AR 71730 | Oil & Gas Operator | May 2025 |
| 227 | Rash, Terry | Corsicana, TX 75109 | Oil & Gas Operator | May 2025 |
| 228 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 229 | Reilly, K. L. | Huntsville, TX 77342 | Oil Operator | Dec 2004 |
| 230 | Reostar Operating Incorporated | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2012 |
| 231 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 232 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 233 | Richey Properties, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 234 | Ridley Oil Corporation | Tyler, TX 75702 | Oil & Gas Operator | Nov 1996 |
| 235 | Rife Energy Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 236 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 237 | Rising Star Petroleum, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2010 |
| 238 | River City Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 239 | Roberson, Joe | Vernon, TX 76385 | Oil & Gas Operator | Feb 2015 |
| 240 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 241 | Ross-Rippy | Tyler, TX 75702 | Oil & Gas Operator | Oct 2002 |
| 242 | Rowan, Al | Van, TX 75790 | Oil & Gas Operator | Apr 2021 |
| 243 | Rowan-Ungerecht, Inc. | Van, TX 75790 | Oil & Gas Operator | Sep 1993 |
| 244 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | May 2025 |
| 245 | RWJ Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 246 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 247 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 248 | Sabio Oil & Gas Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 1998 |
| 249 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 250 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 251 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 252 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 253 | Santerra Oil & Gas, Inc. | Seagoville, TX 75159 | Oil & Gas Operator | May 2025 |
| 254 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 255 | Scope Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2003 |
| 256 | Scott Oil Company | Corsicana, TX 75110 | Oil & Gas Operator | Apr 2011 |
| 257 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 258 | Seismic Leasing Service | Denver, CO 80216 | Oil & Gas Operator | Aug 2000 |
| 259 | Sheer Energy, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 260 | SHWJ Oil & Gas Co., Inc. | Oil City, LA 71061 | Oil Operator | May 2025 |
| 261 | Silver Tusk Operating Co. LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2018 |
| 262 | Siroco Operating Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2010 |
| 263 | Skewes Operating Company | Bluefield, VA 24605 | Oil & Gas Operator | May 2025 |
| 264 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Dec 2024 |
| 265 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 266 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 267 | Square One Energy, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Oct 2015 |
| 268 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | May 2025 |
| 269 | Stacy Reamy | Purdon, TX 76679 | Oil Operator | May 2025 |
| 270 | Stoner Oil | Corsicana, TX 75109 | Oil Operator | May 2025 |
| 271 | Stoner, C. M. | Cleburne, TX 76031 | Oil & Gas Operator | Oct 1996 |
| 272 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 273 | Stroube Family Partnership #2 | Corsicana, TX 75151 | Oil Operator | May 2025 |
| 274 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | May 2025 |
| 275 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2025 |
| 276 | Summitt Resources | Corsicana, TX 75110 | Oil & Gas Operator | Apr 2008 |
| 277 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 278 | Teague Operating Co. | Mabank, TX 75147 | Oil & Gas Operator | Jul 1995 |
| 279 | Teco Operating Company | Athens, TX 75751 | Oil & Gas Operator | Jun 2001 |
| 280 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | May 2025 |
| 281 | Texas M.O.R., Inc. | Corsicana, TX 75109 | Oil Operator | Sep 2013 |
| 282 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 283 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 284 | Texlan Oil Company, L.C. | Tyler, TX 75711 | Oil & Gas Operator | Aug 2003 |
| 285 | Texowa, LLC | Roanoke, TX 76262 | Oil Operator | May 2025 |
| 286 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Feb 2025 |
| 287 | Thurston Texas Operating Co LLC | Dallas, TX 75219 | Oil Operator | May 2025 |
| 288 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Feb 2025 |
| 289 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 290 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 291 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 292 | Triple J Investments Inc | Longview, TX 75606 | Oil & Gas Operator | Feb 2023 |
| 293 | Triton Energy LLC | Wortham, TX 76693 | Oil & Gas Operator | May 2025 |
| 294 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 295 | Tuleta Energy Partners, LLC | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 296 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 297 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 298 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 299 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 300 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | May 2025 |