| 201 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 202 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 203 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 204 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 205 | Hodge T F | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2007 |
| 206 | Hondo Drilling Company | Midland, TX 79702 | Oil & Gas Operator | Nov 1996 |
| 207 | Hope Energy, L.L.C. | Snyder, TX 79549 | Oil & Gas Operator | Jul 2025 |
| 208 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 209 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 210 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Jul 2025 |
| 211 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 212 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 213 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |
| 214 | I & L Development Co. | Dallas, TX 75219 | Oil & Gas Operator | Mar 1996 |
| 215 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 216 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Jul 2025 |
| 217 | Ira Testers | Ira, TX 79527 | Oil & Gas Operator | Mar 2024 |
| 218 | Ira Testers, LLC | Ira, TX 79527 | Oil Operator | Jul 2025 |
| 219 | Iron Bell Operating, LLC | Lubbock, TX 79423 | Oil & Gas Operator | Jul 2025 |
| 220 | Ivory Energy, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 221 | J.H.R. Corporation | Bridgeville, PA 15017 | Oil & Gas Operator | Jul 2001 |
| 222 | Johnson Royalties, Inc. | Austin, TX 78729 | Oil & Gas Operator | Jul 2002 |
| 223 | Journey Operating, L.L.C. | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 224 | Jrow Energy LLC | Lubbock, TX 79423 | Oil Operator | Jul 2025 |
| 225 | Judah Oil | Artesia, NM 88211 | Oil & Gas Operator | Mar 2010 |
| 226 | Juna Operating Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 1996 |
| 227 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 228 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 229 | Karico GP, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 230 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Jul 2025 |
| 231 | Keeley Oil, L.L.C. | Dallas, TX 75225 | Oil Operator | Jul 2025 |
| 232 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Apr 2025 |
| 233 | Key, J. J. | Lubbock, TX 79416 | Oil & Gas Operator | Jul 2025 |
| 234 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 2025 |
| 235 | Kimbell Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 236 | Kimsey, Roy E., Jr. | Midland, TX 79701 | Oil & Gas Operator | May 2018 |
| 237 | Kinder Morgan Co2 Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 238 | Kinder Morgan Production Co LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 239 | Kinder Morgan Production Co LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2007 |
| 240 | Kinder Morgan Sacroc LP | Snyder, TX 79549 | Oil & Gas Operator | Dec 2003 |
| 241 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Jul 2025 |
| 242 | Knox Industries, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Jul 2025 |
| 243 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 244 | Kstone Energy, LLC | Oklahoma City, OK 73106 | Oil Operator | Jul 2025 |
| 245 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 246 | La Roca Energy, LP | Dallas, TX 75207 | Oil & Gas Operator | May 2024 |
| 247 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 248 | Lamb & Mize | Azle, TX 76020 | Oil & Gas Operator | Jul 2025 |
| 249 | Landreth, Robert E. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 250 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 251 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 252 | Latimer, D. Gail Enterprises,Inc | Snyder, TX 79550 | Oil & Gas Operator | Jul 2004 |
| 253 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jul 2025 |
| 254 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 255 | Legend Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2010 |
| 256 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 257 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 258 | Lemay Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Jun 2002 |
| 259 | Lobo Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 260 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 261 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 262 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Jul 2025 |
| 263 | Lunar Oil Company | Midland, TX 79708 | Oil & Gas Operator | Feb 1999 |
| 264 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 265 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 266 | M & K Operating LLC | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 267 | M & M General Contractors, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Jul 2025 |
| 268 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 269 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 270 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 271 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | Jul 2025 |
| 272 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 273 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 274 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 275 | McCamey Oil And Gas LLC | MC Camey, TX 79752 | Oil Operator | Jul 2025 |
| 276 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 277 | McDonald & Pomeroy Operating Co. | Pasadena, TX 77506 | Oil & Gas Operator | Aug 2003 |
| 278 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 279 | McFadden Energy TX, LLC | Lakewood, NY 14750 | Oil Operator | Jul 2025 |
| 280 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 281 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 282 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 283 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 284 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 285 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 286 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Jul 2025 |
| 287 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Jul 2025 |
| 288 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 289 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | May 2025 |
| 290 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 291 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 292 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 293 | Monexco LLC | Dallas, TX 75204-2634 | Oil & Gas Operator | Apr 2025 |
| 294 | Montare Operating, LTD. | Flower Mound, TX 75022 | Oil & Gas Operator | Jul 2025 |
| 295 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 296 | Morgan Creek Production Co., Inc | Westbrook, TX 79565 | Oil & Gas Operator | Jul 2025 |
| 297 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 298 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Jul 2025 |
| 299 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Apr 2025 |
| 300 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Mar 2024 |