| 201 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 202 | Overton Park Oil & Gas LP | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 203 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 204 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 205 | Pan American Sales Corporation | Dallas, TX 75202 | Oil & Gas Operator | Mar 2001 |
| 206 | Panhandle Producing Company | San Antonio, TX 78205 | Oil & Gas Operator | Oct 1993 |
| 207 | Pearl, Bill H. Productions, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 2025 |
| 208 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 209 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 210 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Dec 2025 |
| 211 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 212 | Pheffer Oil, L.L.C. | Laredo, TX 78041 | Oil Operator | Jul 2021 |
| 213 | Philpott Oil & Gas Co Inc | Atwood, KS 67730 | Oil Operator | Aug 2010 |
| 214 | Pi Energy, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 215 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 216 | Pintex Operating Inc. | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2005 |
| 217 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 218 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 219 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 220 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 221 | Price Drilling & Exploration Co. | Benavides, TX 78341 | Oil & Gas Operator | Jul 2013 |
| 222 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 223 | Pringle Resources, Inc. | Houston, TX 77019 | Oil & Gas Operator | Dec 2025 |
| 224 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2025 |
| 225 | Quinn, Karen | Round Rock, TX 78681 | Oil Operator | Sep 2018 |
| 226 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 227 | Rancho Blanco Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1995 |
| 228 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 229 | Ray Jr. Co., Inc. | Pleasanton, TX 78064 | Oil & Gas Operator | Dec 2025 |
| 230 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 231 | Remco Oil & Gas Production,Inc. | Rio Grande Ci, TX 78582 | Oil & Gas Operator | Nov 2021 |
| 232 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 233 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2025 |
| 234 | Rickaway Energy, Corp. | Pleasanton, TX 78064 | Oil & Gas Operator | Dec 2025 |
| 235 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 236 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 237 | Rise Petroleum Investments LLC | Tomball, TX 77377 | Oil & Gas Operator | Dec 2025 |
| 238 | Rlu Operating, LLC | Devine, TX 78016 | Oil & Gas Operator | Dec 2025 |
| 239 | Rodel Oil & Gas Company | Houston, TX 77218 | Oil & Gas Operator | Dec 2025 |
| 240 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 241 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Dec 2025 |
| 242 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Oct 2025 |
| 243 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 244 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 245 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 246 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 247 | Satex Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 248 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 249 | Saxet Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 250 | Sbog, LLC | Granbury, TX 76048 | Oil & Gas Operator | Feb 2021 |
| 251 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 252 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Dec 2025 |
| 253 | Silver Fox Oil & Gas LLC | McAllen, TX 78504 | Oil & Gas Operator | Dec 2025 |
| 254 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Dec 2025 |
| 255 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 256 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 257 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 258 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 259 | Sparta Exploration LLC | Houston, TX 77279 | Oil & Gas Operator | Dec 2025 |
| 260 | Starco Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Dec 2025 |
| 261 | Starr Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 262 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 263 | Stivers Inc | Graham, TX 76450 | Oil & Gas Operator | May 2003 |
| 264 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 265 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 266 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 267 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 268 | Taos Resources Operating Co LLC | Houston, TX 77037 | Oil & Gas Operator | Dec 2019 |
| 269 | TD Natural Resources LLC | Cuero, TX 77954 | Oil & Gas Operator | Dec 2025 |
| 270 | Teal Energy USA, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 271 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 272 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Dec 2025 |
| 273 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 274 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Dec 2025 |
| 275 | Texas Southern Petroleum Corp. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Dec 2025 |
| 276 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 277 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 278 | Three C Exploration, LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Dec 2025 |
| 279 | Three-C Oil And Gas | Hebbronville, TX 78361 | Oil & Gas Operator | Dec 2025 |
| 280 | TNR Petroleum, Inc. | Austin, TX 78747 | Oil & Gas Operator | Sep 1999 |
| 281 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 282 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 283 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 284 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 285 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 286 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 287 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 288 | U.S. Enercorp, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2004 |
| 289 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 290 | United Texas Petroleum Inc. | McKinney, TX 75070 | Oil & Gas Operator | Dec 2025 |
| 291 | United World Energy, Inc. | Aurora, CO 80040 | Oil & Gas Operator | Dec 2025 |
| 292 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 293 | Vantage Operating, LLC | San Antonio, TX 78230 | Oil & Gas Operator | Dec 2025 |
| 294 | Varas Energy Operating Company, LLC | Houston, TX 77005 | Oil & Gas Operator | Dec 2025 |
| 295 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Jun 2025 |
| 296 | Venado Oil & Gas, LLC | Austin, TX 78738 | Oil & Gas Operator | Oct 2016 |
| 297 | Venus Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2002 |
| 298 | Vision Oil And Gas LLC | Laredo, TX 78041 | Oil & Gas Operator | Dec 2025 |
| 299 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 300 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |