| 201 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 202 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 203 | Nielson & Associates Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 204 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 205 | North American Reserve Corp. | Houston, TX 77060 | Oil & Gas Operator | Oct 2010 |
| 206 | Odegard Energy, Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2020 |
| 207 | Oil Well Buyers Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 208 | Opex Energy, LLC | Houston, TX 77042 | Oil & Gas Operator | Mar 2008 |
| 209 | Orisol Oil Co. | Houston, TX 77206 | Oil Operator | Jun 2000 |
| 210 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 211 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 212 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jul 2025 |
| 213 | Pardus Oil & Gas Operating, LP | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2022 |
| 214 | Parten Oil Co. | Houston, TX 77060 | Oil & Gas Operator | Jan 1994 |
| 215 | Parten Operating Inc. | Houston, TX 77069 | Oil & Gas Operator | Jul 2025 |
| 216 | Patriot E & P Company | Tyler, TX 75710 | Oil & Gas Operator | Aug 2004 |
| 217 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 218 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 219 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2025 |
| 220 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Jul 2025 |
| 221 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | Jul 2025 |
| 222 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 223 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 224 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 225 | Pride Exploration, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2015 |
| 226 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 227 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Jul 2025 |
| 228 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Jul 2025 |
| 229 | Proven Natural Resources LLC | Canton, TX 75103 | Oil & Gas Operator | Jul 2025 |
| 230 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 231 | PXP Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2007 |
| 232 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 233 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 234 | Randall Exploration, LLC | Tulsa, OK 74136 | Oil Operator | Jul 2025 |
| 235 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 236 | Red Willow Production, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2015 |
| 237 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 238 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jul 2025 |
| 239 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 240 | Ridge Petroleum Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jul 2025 |
| 241 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | Jul 2025 |
| 242 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 243 | Rose City Resources, LLC | Tyler, TX 75703 | Oil & Gas Operator | Jul 2025 |
| 244 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2025 |
| 245 | Rowan, Al | Van, TX 75790 | Oil & Gas Operator | Apr 2021 |
| 246 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 247 | Rusk Energy Operating LLC | Houston, TX 77040 | Oil & Gas Operator | Jul 2025 |
| 248 | Russell - FT. Trinidad Op., LLC | Tyler, TX 75710 | Oil & Gas Operator | Jul 2025 |
| 249 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 250 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 251 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 252 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 253 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 254 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 255 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Jul 2025 |
| 256 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 257 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | Jul 2025 |
| 258 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Jul 2025 |
| 259 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 260 | Seidler Oil & Gas Operating, LLC | Alvarado, TX 76009 | Oil & Gas Operator | Jul 2025 |
| 261 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 262 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 263 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 264 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 265 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 266 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 267 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | Jul 2025 |
| 268 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Jul 2025 |
| 269 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 270 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 271 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 272 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 273 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 274 | Sun River Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 275 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 276 | Te-Ray Resources, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Mar 2015 |
| 277 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 278 | Tejas Operating Company, Inc. | Houston, TX 77257 | Oil & Gas Operator | May 1995 |
| 279 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 280 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 281 | Texas Moran Exploration Company | Houston, TX 77098 | Oil & Gas Operator | Jun 2023 |
| 282 | Texinia Corp | Dallas, TX 75201 | Oil & Gas Operator | Jun 2015 |
| 283 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Jul 2025 |
| 284 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 285 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 286 | Tracy Production | Lindale, TX 75771 | Oil & Gas Operator | Jul 2025 |
| 287 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 288 | Treadstone Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2016 |
| 289 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 290 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 291 | Trinity Gas Corporation | Edmond, OK 73003 | Oil & Gas Operator | Jul 2025 |
| 292 | Triple "S" Resources Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Jun 1995 |
| 293 | Trivium Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 294 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Jul 2025 |
| 295 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 296 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 297 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 298 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 299 | Uosi Operating, Inc. | Lovelady, TX 75851 | Oil & Gas Operator | Jul 2025 |
| 300 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2025 |