| 201 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | May 2025 |
| 202 | Homeplace Oil And Gas | Caldwell, TX 77836 | Oil & Gas Operator | Feb 2021 |
| 203 | Hopkins Engineering, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 1996 |
| 204 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 205 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 206 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 207 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 208 | Hronek, Kenneth | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 209 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 210 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 211 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 212 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 213 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 214 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 215 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 216 | Indexgeo & Associates, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2009 |
| 217 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 218 | Ineos USA Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 219 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 220 | Integras Operating, LLC | Irving, TX 75062 | Oil & Gas Operator | May 2025 |
| 221 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 222 | Intercoastal Energy, Inc. | Houston, TX 77055 | Oil & Gas Operator | Aug 2003 |
| 223 | Jandar Exploration, L. C. | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 224 | Jena Operating Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2007 |
| 225 | Jilpetco, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | May 2025 |
| 226 | Julil Energy, LLC | Richmond, TX 77406 | Oil & Gas Operator | Dec 2024 |
| 227 | Kachina Oil & Gas Inc. | Austin, TX 78766 | Oil & Gas Operator | Jul 2002 |
| 228 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | May 2025 |
| 229 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 230 | Key Operating & Equipment, Inc. | Midlothian, TX 76065 | Oil & Gas Operator | Nov 2024 |
| 231 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 232 | Killam Oil Co., LTD. | Laredo, TX 78042 | Oil & Gas Operator | May 2025 |
| 233 | Killam Oil Company | Laredo, TX 78042 | Oil & Gas Operator | Mar 1994 |
| 234 | Kouatli, Aiman M. | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 235 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 236 | Landmark Exploration Inc. | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 237 | Laredo Energy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2022 |
| 238 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 239 | Leexus Oil LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2025 |
| 240 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 241 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 242 | Lindow Oil & Gas, LLC | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 243 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 244 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 245 | Llewellin Operating Company, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2017 |
| 246 | LRR Pecos Valley, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 247 | Lynco Oilfield Equipment, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 248 | M. K. Production | Caldwell, TX 77836 | Oil & Gas Operator | Mar 2008 |
| 249 | Magnatex Corp | Midland, TX 79702-1311 | Oil & Gas Operator | Feb 1995 |
| 250 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 251 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 252 | Marlin Energy Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2018 |
| 253 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 254 | Mayjac I, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 255 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 256 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Mar 2025 |
| 257 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 258 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 259 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 260 | Merica Oil Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Sep 2024 |
| 261 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 262 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 263 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 264 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 265 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 266 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 267 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | May 2025 |
| 268 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 269 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 270 | Mobile Production Systems, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 1995 |
| 271 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Feb 2025 |
| 272 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 273 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 274 | Morrow Resources, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2004 |
| 275 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | May 2025 |
| 276 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 277 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 278 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | May 2025 |
| 279 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 280 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2025 |
| 281 | New Century Operating, LLC | Spring, TX 77379 | Oil Operator | Apr 2021 |
| 282 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 283 | Newturn Oil Company | Houston, TX 77208 | Oil & Gas Operator | Jan 2004 |
| 284 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 285 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | May 2025 |
| 286 | Noel Operating, Inc. | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2000 |
| 287 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 288 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 289 | Ogden Resources Corporation | Bryan, TX 77802 | Oil & Gas Operator | May 2025 |
| 290 | Ogden Resources, LTD. | Bryan, TX 77802 | Oil & Gas Operator | Feb 2009 |
| 291 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 292 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 293 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 294 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 295 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 296 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 297 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 298 | Outlaw Oil LLC | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 299 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2025 |
| 300 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |