| 201 | Hawn Brothers | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2003 |
| 202 | Heritage Expl. & Prod. Co., Inc. | Stafford, TX 77497 | Oil & Gas Operator | Dec 2000 |
| 203 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Mar 2025 |
| 204 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 205 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 206 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 207 | Hopco Operating, Inc. | Stafford, TX 77497 | Oil & Gas Operator | Dec 2016 |
| 208 | Horizon Exploration Services | El Paso, TX 79922 | Oil Operator | Mar 2025 |
| 209 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 210 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 211 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 212 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 213 | Inpex Eagle Ford, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2022 |
| 214 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 215 | Ironwood Oil & Gas LLC | Houston, TX 77067 | Oil & Gas Operator | Jun 2014 |
| 216 | Iv L.C. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 217 | J & S Operating | Shiner, TX 77984 | Oil & Gas Operator | Dec 2002 |
| 218 | J.R. Oil And Gas Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2025 |
| 219 | J.W. Service Company | Smithville, TX 78957 | Oil & Gas Operator | Mar 2025 |
| 220 | J6 Operating, LLC | Shiner, TX 77984 | Oil Operator | Mar 2009 |
| 221 | Jackson Petroleum Consulting,Inc | Plano, TX 75075 | Oil & Gas Operator | Sep 2019 |
| 222 | Jad Oil, Inc. | Hallettsville, TX 77964 | Oil & Gas Operator | Mar 2025 |
| 223 | Jalapeno Corporation | Albuquerque, NM 87103 | Oil & Gas Operator | Dec 2023 |
| 224 | Jena Operating Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2007 |
| 225 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 226 | Jet Black Oil, Inc. | Katy, TX 77494 | Oil Operator | Mar 2025 |
| 227 | Jet Oil Producers, Inc. | Coldspring, TX 77331 | Oil & Gas Operator | Mar 2025 |
| 228 | JL Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 229 | JMD Resources Inc | Belot, OH 44609 | Oil & Gas Operator | Dec 2015 |
| 230 | K & L Oil, LLC | Gonzales, TX 78629 | Oil Operator | Mar 2025 |
| 231 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 232 | Kasan Corp. | Pharr, TX 78577 | Oil & Gas Operator | Sep 1995 |
| 233 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 234 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 235 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 236 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 237 | Kidd Production Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 238 | Kinder Morgan Production Co LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2007 |
| 239 | Kouatli, Aiman M. | Caldwell, TX 77836 | Oil & Gas Operator | Mar 2025 |
| 240 | Lacy 03, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 241 | Lacy, J. W., Jr. | Midland, TX 79702 | Oil & Gas Operator | Dec 2007 |
| 242 | Lakehills Production, Inc. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |
| 243 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 244 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 245 | Libom Oil Company | Elmsford, NY 10523 | Oil & Gas Operator | Aug 2003 |
| 246 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 247 | Little, Quintin Company,Inc.,The | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2025 |
| 248 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 249 | LLT Energy, Inc. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 250 | Locin Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 251 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 252 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Mar 2025 |
| 253 | LP Operating, LLC | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 254 | Lucas Energy, Inc. | Houston, TX 77067 | Oil & Gas Operator | Feb 2017 |
| 255 | Lynco Oilfield Equipment, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 256 | M & B Operating, LLC | Gonzales, TX 78629 | Oil Operator | Mar 2025 |
| 257 | M V Purchasing LLC | Wichita, KS 67202 | Oil & Gas Operator | Dec 2024 |
| 258 | M W Production Co. | New Braunfels, TX 78130 | Oil & Gas Operator | Aug 2003 |
| 259 | Magic Circle Energy | Oklahoma City, OK 73185 | Oil & Gas Operator | Dec 1983 |
| 260 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 261 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 262 | Maranatha Oil Company | Gonzales, TX 78629 | Oil & Gas Operator | Mar 2025 |
| 263 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 264 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 265 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 266 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 267 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 268 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 269 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 270 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 271 | McCarter, A. Nelson | Houston, TX 77063 | Oil & Gas Operator | Aug 2003 |
| 272 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 273 | McGehee, George T. Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 1997 |
| 274 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 275 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Jan 2025 |
| 276 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 277 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 278 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 279 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 280 | Millennium Exploration Co. LLC | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2025 |
| 281 | Mina Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2012 |
| 282 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 283 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Mar 2025 |
| 284 | Mortimer Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 285 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 286 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 287 | NGL Crude Logistics LLC | Denver, CO 80209 | Oil Operator | Dec 2024 |
| 288 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 289 | Nitschke, Dan E. | Henrietta, TX 76365 | Oil & Gas Operator | Mar 2025 |
| 290 | NMR Energy LLC | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 291 | Nobel Petroleum USA Inc. | League City, TX 77573 | Oil Operator | Mar 2025 |
| 292 | North South Oil, LLC | Luling, TX 78648 | Oil Operator | Mar 2025 |
| 293 | Novo Energy Resources | Houston, TX 77006 | Oil & Gas Operator | Mar 2025 |
| 294 | Oak Valley Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 295 | Oasis Operating, Inc. | Lubbock, TX 79404 | Oil & Gas Operator | Nov 2020 |
| 296 | Oil, Gas, Etc. LLC | Katy, TX 77449 | Oil & Gas Operator | Mar 2025 |
| 297 | Oky Investments, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Sep 2021 |
| 298 | Olmos Partners, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 299 | Olsen Energy Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 300 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |