| 301 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 302 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 303 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |
| 304 | Hurst Oil & Gas, Inc. | Hillsboro, TX 76645 | Oil & Gas Operator | Dec 2024 |
| 305 | Ica Energy Operating, L.L.C. | Odessa, TX 79760 | Oil & Gas Operator | Mar 2025 |
| 306 | Ice Well Services, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Mar 2025 |
| 307 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 308 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 309 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 310 | Iron Orchard Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 311 | Iskandia Energy Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 312 | J & A Oil Company | Odessa, TX 79764 | Oil & Gas Operator | Mar 2025 |
| 313 | Jagged Peak Energy LLC | Oklahoma City, OK 73126 | Oil & Gas Operator | Mar 2025 |
| 314 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 315 | Jin Petroleum LLC | New Braunfels, TX 78130 | Oil Operator | Mar 2025 |
| 316 | Johnson And Price | Midland, TX 79702 | Oil & Gas Operator | Dec 1995 |
| 317 | Johnson, Tom E. | Midland, TX 79702 | Oil & Gas Operator | Jun 2008 |
| 318 | Joint Resources Company | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 319 | Jones, Charles E., Jr. | Odessa, TX 79760 | Oil & Gas Operator | Jul 2013 |
| 320 | JRC Petroleum | Pecos, TX 79772 | Oil & Gas Operator | Mar 2025 |
| 321 | Juno Operating Company III, LLC | Plano, TX 75093 | Oil & Gas Operator | Mar 2025 |
| 322 | Just Oil | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 323 | Just Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 324 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 325 | K3 Productions LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 326 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 327 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 328 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 329 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 330 | Killer Rabbit Fields LLC | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 331 | King Oil & Resources Co | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 332 | Klabzuba Brothers LLC | Prague, OK 74864-0567 | Oil & Gas Operator | Jul 2007 |
| 333 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 334 | KTC Oil Enterprises, LLC | Dallas, TX 75247 | Oil & Gas Operator | Mar 2025 |
| 335 | Landreth, Robert E. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 336 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Mar 2025 |
| 337 | LDF Energy, LLC | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 338 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 339 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 340 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 341 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 342 | Lonesome B, LLC | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 343 | Longhorn Service & Drilling Co. | Kermit, TX 79745 | Oil & Gas Operator | Jun 2019 |
| 344 | Lorlan Oil Company | Wink, TX 79789 | Oil & Gas Operator | Aug 2020 |
| 345 | Lyn-San Company | Midland, TX 79708 | Oil & Gas Operator | Dec 2018 |
| 346 | Lynx Petroleum Consultants Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2024 |
| 347 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 348 | M & J Energy, Inc. | Breckenridge, CO 80424 | Oil & Gas Operator | Mar 2025 |
| 349 | M & M Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2024 |
| 350 | M T M Oil | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 351 | M V Purchasing LLC | Wichita, KS 67202 | Oil & Gas Operator | Dec 2024 |
| 352 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 353 | M-W-D Oil Co. | Odessa, TX 79760 | Oil & Gas Operator | Jul 1999 |
| 354 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 355 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 356 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 357 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 358 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 359 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 360 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 361 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 362 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 363 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 364 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 365 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 366 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 367 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 368 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 369 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Dec 2024 |
| 370 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 371 | McDonald Energy, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Mar 2025 |
| 372 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 373 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 374 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 375 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 376 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 377 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 378 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 379 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 380 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 381 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 382 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 383 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 384 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 385 | Midland Southwest Cold Lake Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 1997 |
| 386 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 387 | Millwee Oil, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 388 | Millwee, John F. | Midland, TX 79705 | Oil & Gas Operator | Jul 2018 |
| 389 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 390 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2025 |
| 391 | Minihan Oil & Gas Corporation | Midland, TX 79704 | Oil & Gas Operator | Apr 2004 |
| 392 | Minihan Oil & Gas LTD. | Denver, CO 80202 | Oil & Gas Operator | Jul 2006 |
| 393 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 394 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 395 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 396 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 397 | Momentum Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 398 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 399 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 400 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |