| 201 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 202 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 203 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 204 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 205 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 206 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 207 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 208 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 209 | Indexgeo & Associates, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2009 |
| 210 | Ineos USA Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 211 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 212 | Ironroc Energy | The Woodlands, TX 77381 | Oil & Gas Operator | May 2025 |
| 213 | Itech Oil Company | Cypress, TX 77429 | Oil & Gas Operator | Aug 2007 |
| 214 | Jackson Energy Development, Inc. | Cedar Park, TX 78613 | Oil & Gas Operator | May 2025 |
| 215 | Jad Oil, Inc. | Hallettsville, TX 77964 | Oil & Gas Operator | May 2025 |
| 216 | Jena Operating Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2007 |
| 217 | Jenex Operating Company Of Texas | Denver, CO 80209 | Oil & Gas Operator | Aug 2003 |
| 218 | Jenkins Oil Corporation | Hankamer, TX 77560 | Oil & Gas Operator | Mar 2008 |
| 219 | Journey Operating, L.L.C. | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 220 | Kachina Oil & Gas Inc. | Austin, TX 78766 | Oil & Gas Operator | Jul 2002 |
| 221 | Keeley Oil, L.L.C. | Dallas, TX 75225 | Oil Operator | May 2025 |
| 222 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 223 | Kouatli, Aiman M. | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 224 | L & F Drilling Co., Inc. (1) | Corpus Chrsti, TX 78479 | Oil & Gas Operator | May 2025 |
| 225 | L & R Drilling Company | Belle Fourche, SD 57717 | Oil & Gas Operator | Dec 1999 |
| 226 | Lacy, J. W., Jr. | Midland, TX 79702 | Oil & Gas Operator | Dec 2007 |
| 227 | Lama Energy, L.L.C. | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 228 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 229 | Leexus Oil LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2025 |
| 230 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 231 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | May 2025 |
| 232 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 233 | Lower Colorado River Authority | Bastrop, TX 78602 | Oil & Gas Operator | May 2025 |
| 234 | Lynco Oilfield Equipment, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 235 | M W Production Co. | New Braunfels, TX 78130 | Oil & Gas Operator | Aug 2003 |
| 236 | M. S. Productions, Inc. | Pittsburg, KS 66762 | Oil & Gas Operator | Nov 2019 |
| 237 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 238 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 239 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 240 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | May 2025 |
| 241 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 242 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | May 2025 |
| 243 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 244 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | May 2025 |
| 245 | McCarter, A. Nelson | Houston, TX 77063 | Oil & Gas Operator | Aug 2003 |
| 246 | McCombs Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2006 |
| 247 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 248 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 249 | Merica Oil Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Sep 2024 |
| 250 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 251 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 252 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 253 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 254 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 255 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 256 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 257 | ML Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 258 | Mockingbird Oil, Inc. (I) | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 259 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 260 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | May 2025 |
| 261 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 262 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 263 | N. A. Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2007 |
| 264 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 265 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 266 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | May 2025 |
| 267 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 268 | Noel Operating, Inc. | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2000 |
| 269 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 270 | Oak Valley Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 271 | Oasis Operating, Inc. | Lubbock, TX 79404 | Oil & Gas Operator | Nov 2020 |
| 272 | Oblaen Resources LLC | Wallis, TX 77485 | Oil & Gas Operator | May 2025 |
| 273 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 274 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 275 | Orbis Energy, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2001 |
| 276 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 277 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 278 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2025 |
| 279 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 280 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | May 2025 |
| 281 | Par Producing Company | Snyder, TX 79550 | Oil & Gas Operator | Jun 2017 |
| 282 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 283 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 284 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 285 | Parkway Petroleum, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 286 | Partners Production, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 287 | Patterson Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 288 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 289 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 290 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 291 | Pegasus Petroleum Corporation | Corpus Chrsti, TX 78476 | Oil & Gas Operator | May 2025 |
| 292 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 293 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | May 2025 |
| 294 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 295 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 296 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 297 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 298 | Pintail Production Co., Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | May 2025 |
| 299 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 300 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |