| 201 | Phoenix Fund, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2000 |
| 202 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 203 | Phylko Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 204 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jul 2024 |
| 205 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 206 | Powell, Gene Investments, Inc. | Longview, TX 75608 | Oil & Gas Operator | Apr 2024 |
| 207 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | May 2025 |
| 208 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 209 | Progressive Gas Services Inc. | Houston, TX 77279 | Oil & Gas Operator | Feb 2002 |
| 210 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2025 |
| 211 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 212 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 213 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | May 2025 |
| 214 | Randall Exploration, LLC | Tulsa, OK 74136 | Oil Operator | May 2025 |
| 215 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 216 | Recon Oil Co. | Emory, TX 75440 | Oil & Gas Operator | May 2025 |
| 217 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 218 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 219 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 220 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 221 | Ridley Oil Corporation | Tyler, TX 75702 | Oil & Gas Operator | Nov 1996 |
| 222 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 223 | Rincon Production Co., Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 1997 |
| 224 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 225 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 226 | Rising Star Petroleum, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2010 |
| 227 | Ro-Jo, Inc. | Highland VLG, TX 75077 | Oil & Gas Operator | Aug 2003 |
| 228 | Roosth & Genecov Production Co. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2003 |
| 229 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 230 | Rose City Resources, LLC | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 231 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 232 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 233 | Rush Creek Operating LLC | McKinney, TX 75070 | Oil & Gas Operator | May 2025 |
| 234 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 235 | Salt Creek Resources, LLC | Caney, KS 67333 | Oil Operator | Oct 2019 |
| 236 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 237 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 238 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 239 | Sand Springs Oil & Gas Co. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 240 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | May 2025 |
| 241 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | May 2025 |
| 242 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 243 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 244 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 245 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 246 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 247 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 248 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 249 | Silver Tusk Operating Co. LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2018 |
| 250 | Smackover Shell LTD. Partnership | Houston, TX 77001 | Gas Operator | Apr 2000 |
| 251 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 252 | Sone Energy Corporation | Plano, TX 75023 | Oil & Gas Operator | Sep 1995 |
| 253 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 254 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 255 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | May 2025 |
| 256 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 257 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2025 |
| 258 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | May 2025 |
| 259 | Tactical Operating Company, LLC | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 260 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 261 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | May 2025 |
| 262 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | May 2025 |
| 263 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 264 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Mar 2025 |
| 265 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 266 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 267 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | May 2025 |
| 268 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 269 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 270 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 271 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 272 | Ultra Petroleum (U.S.A.), Inc. | Granbury, TX 76048 | Oil & Gas Operator | Sep 2003 |
| 273 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 274 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 275 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 276 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 277 | Us Energy Holdings, LLC | Richardson, TX 75080 | Oil & Gas Operator | May 2025 |
| 278 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | May 2025 |
| 279 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 280 | Ventum Oil And Gas, LP | Northbrook, IL 60062 | Oil & Gas Operator | Mar 2010 |
| 281 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Feb 2025 |
| 282 | Vintage Petroleum, LLC | Houston, TX 77210 | Oil & Gas Operator | Dec 2019 |
| 283 | Ward Oil Co. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 284 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 285 | Weathers Exploration, Inc. | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 286 | Wenexco, Inc. | Streetman, TX 75859 | Oil & Gas Operator | May 2025 |
| 287 | West Mountain Operating Co, Inc. | Longview, TX 75604 | Oil & Gas Operator | Feb 2019 |
| 288 | West Texas Diversified Interests | Eastland, TX 76448 | Oil & Gas Operator | Jun 2006 |
| 289 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 290 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 291 | Wilson - Owens Production Co. | Longview, TX 75601 | Oil & Gas Operator | Nov 1998 |
| 292 | Wimco | Dallas, TX 75229 | Oil & Gas Operator | Jul 2008 |
| 293 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |