| 201 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 202 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 203 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Dec 2025 |
| 204 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 205 | Kimbrel Oil Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 206 | Kouatli, Aiman M. | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 207 | La Campana, Inc. | Port Aransas, TX 78373 | Oil & Gas Operator | Dec 2025 |
| 208 | Landmark Exploration Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 209 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 210 | Laredo Energy | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 211 | Laredo Energy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2022 |
| 212 | Lawson Petroleum Co. | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2009 |
| 213 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 214 | Leexus Oil LLC | Giddings, TX 78942 | Oil & Gas Operator | Dec 2025 |
| 215 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 216 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 217 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 218 | Lowrance & Ray Exploration, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Sep 2003 |
| 219 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 220 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 221 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 222 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 223 | Marlin Energy Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2018 |
| 224 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 225 | MC1 Consulting, Inc. | San Antonio, TX 78209 | Oil Operator | Sep 2025 |
| 226 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 227 | MD America Energy, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 228 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 229 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 230 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 231 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 232 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 233 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2025 |
| 234 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 235 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 236 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Aug 2025 |
| 237 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 238 | Mosaic Oil LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 239 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 240 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Dec 2025 |
| 241 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 242 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Dec 2025 |
| 243 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | Dec 2025 |
| 244 | New Gulf Resources, LLC | Tulsa, OK 74133 | Oil & Gas Operator | May 2018 |
| 245 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 246 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | Dec 2025 |
| 247 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 248 | Noel Operating, Inc. | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2000 |
| 249 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 250 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 251 | Northfield Enterprises | Bryan, TX 77805 | Oil & Gas Operator | Dec 1993 |
| 252 | Northfield Enterprises, Inc. | Bryan, TX 77805 | Oil & Gas Operator | Dec 2025 |
| 253 | O&G Investments Inc. | Runge, TX 78151 | Oil & Gas Operator | Feb 2003 |
| 254 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 255 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 256 | Ogden Resources Corporation | Bryan, TX 77802 | Oil & Gas Operator | Dec 2025 |
| 257 | Ogden Resources, LTD. | Bryan, TX 77802 | Oil & Gas Operator | Feb 2009 |
| 258 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 259 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Dec 2025 |
| 260 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 261 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Dec 2025 |
| 262 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 263 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 264 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Dec 2025 |
| 265 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 266 | Palmer Petroleum, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 267 | Panda Pipe & Equipment, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 1996 |
| 268 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 269 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 270 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 271 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 272 | Partners Production, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 273 | Pasture Production Company | Bryan, TX 77808 | Oil & Gas Operator | Apr 2005 |
| 274 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 275 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 276 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 277 | Pentex Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 278 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 279 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 280 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 281 | Petrotex Engineering Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2025 |
| 282 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 283 | Pierce Operating Company, L.L.C. | Bryan, TX 77808 | Oil & Gas Operator | Dec 2018 |
| 284 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 285 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 286 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 287 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Dec 2025 |
| 288 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 289 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 290 | Producers Engineering Company | Destin, FL 32541 | Oil & Gas Operator | Sep 1999 |
| 291 | Proven Natural Resources LLC | Canton, TX 75103 | Oil & Gas Operator | Dec 2025 |
| 292 | Quanico Oil & Gas, Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Dec 2025 |
| 293 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 294 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | Dec 2025 |
| 295 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 296 | Ramrod Oil And Gas (U.S.A.) Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2025 |
| 297 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 298 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 299 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 300 | Rci, L.L.C. | Abilene, TX 79606 | Oil & Gas Operator | Dec 2025 |