| 201 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 202 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Jan 2025 |
| 203 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 204 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 205 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 206 | Phylko Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 207 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 208 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 209 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 210 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Apr 2025 |
| 211 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Apr 2025 |
| 212 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Apr 2025 |
| 213 | Promise Energy Operations, LLC | Texas City, TX 77592 | Oil Operator | Apr 2025 |
| 214 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 215 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 216 | Ratex Energy Inc. | Manchaca, TX 78652 | Oil & Gas Operator | Sep 2002 |
| 217 | Reb Petroleum Company | Sugar Land, TX 77478 | Oil & Gas Operator | Apr 2025 |
| 218 | Redbud E & P, Inc. | Spring, TX 77379 | Oil & Gas Operator | Apr 2025 |
| 219 | Redwood Energy Production, L.P. | San Francisco, CA 94104 | Gas Operator | Apr 2025 |
| 220 | Reed Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 221 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 222 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 223 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 224 | Roy Jackson Energy Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 225 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |
| 226 | Russell - FT. Trinidad Op., LLC | Tyler, TX 75710 | Oil & Gas Operator | Apr 2025 |
| 227 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 228 | Sabalo Exploration Operating,LLC | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Jan 2021 |
| 229 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Apr 2025 |
| 230 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 231 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 232 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 233 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 234 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Apr 2025 |
| 235 | Saxet Exploration Ent. Co., Inc. | Fulshear, TX 77441 | Oil Operator | Apr 2025 |
| 236 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | Apr 2025 |
| 237 | Sbog, LLC | Granbury, TX 76048 | Oil & Gas Operator | Feb 2021 |
| 238 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 239 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 240 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Jan 2025 |
| 241 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Apr 2025 |
| 242 | Showhorn Holding Co., L.L.C. | Normangee, TX 77871 | Oil Operator | Apr 2025 |
| 243 | Sikes Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jun 2003 |
| 244 | Silver Oak Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2016 |
| 245 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2025 |
| 246 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 247 | Smith, L C Production | Jacksonville, TX 75766 | Oil Operator | Apr 2025 |
| 248 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | Apr 2025 |
| 249 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 250 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 251 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Apr 2025 |
| 252 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Apr 2025 |
| 253 | Stallion Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 254 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2025 |
| 255 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 256 | Stone Mountain Petroleum, LLC | Houston, TX 77008 | Oil & Gas Operator | Aug 2002 |
| 257 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 258 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Apr 2025 |
| 259 | Stratlynn, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 260 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Apr 2025 |
| 261 | Summit Resources MGMT., LLC. | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 262 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 263 | Tag Enterprises Inc | Shelocta, PA 15774-0310 | Gas Operator | Dec 2016 |
| 264 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 265 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 266 | TC3 Energy Services Company | Bryan, TX 77805 | Oil & Gas Operator | Jan 2005 |
| 267 | Tejas Operating Company, Inc. | Houston, TX 77257 | Oil & Gas Operator | May 1995 |
| 268 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 269 | Texas Presco, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 270 | Texcal Energy (GP) LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2016 |
| 271 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 272 | Treadstone Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2016 |
| 273 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Apr 2025 |
| 274 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 275 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Apr 2025 |
| 276 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 277 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 278 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 279 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 280 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 281 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 282 | United Resources LP | Austin, TX 78746 | Oil & Gas Operator | Oct 2011 |
| 283 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2025 |
| 284 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 285 | Viceroy Petroleum GP, LLC | Rockdale, TX 76567 | Oil & Gas Operator | Feb 2010 |
| 286 | Viceroy Petroleum, LP | College Sta, TX 77845 | Oil & Gas Operator | Apr 2025 |
| 287 | Viking Resources, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Apr 2025 |
| 288 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Jan 2025 |
| 289 | Viola Prod., Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 290 | Vital Petroleum LLC | Tomball, TX 77375 | Oil Operator | Apr 2025 |
| 291 | Walsh Resources, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Apr 2025 |
| 292 | WCS Oil & Gas Corporation | Dallas, TX 75209 | Oil & Gas Operator | Aug 2021 |
| 293 | Weber Energy Corporation | Dallas, TX 75219 | Oil & Gas Operator | Feb 2017 |
| 294 | Westco Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Apr 2025 |
| 295 | Wheeler Operating Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Apr 2025 |
| 296 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 297 | Wildfire Energy Operating LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2025 |
| 298 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2025 |
| 299 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 300 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |