| 301 | Ladd LLC | El Reno, OK 73036 | Oil & Gas Operator | Nov 2018 |
| 302 | Ladd Oil & Gas Corporation | Midland, TX 79711 | Oil & Gas Operator | Dec 2021 |
| 303 | Lake Crystal Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | May 2025 |
| 304 | Landmark Ip, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 305 | Laredo Petroleum - Dallas, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 2014 |
| 306 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 307 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | May 2025 |
| 308 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 309 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 310 | Lbo Energy, Inc. | Kentfield, CA 94914 | Gas Operator | Nov 2002 |
| 311 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 312 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | May 2025 |
| 313 | Lewis, James B. Land & Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Nov 1998 |
| 314 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 315 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 316 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 317 | Lion Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 318 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 319 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 320 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | May 2025 |
| 321 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 322 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 323 | Mak-J Energy Partners(TX),LTD. | Denver, CO 80206 | Oil & Gas Operator | Sep 2013 |
| 324 | Mallon Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 325 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 326 | Maple Energy Holdings, LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2023 |
| 327 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 328 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |
| 329 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 330 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 331 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 332 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | May 2025 |
| 333 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 334 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 335 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 336 | Mayjac I, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 337 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 338 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 339 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 340 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 341 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 342 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 343 | MDC Texas Operator LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 344 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 345 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 346 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 347 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 348 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 349 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | May 2025 |
| 350 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 351 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 352 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 353 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 354 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 355 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 356 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 357 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 358 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 359 | Momentum Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 360 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 361 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Mar 2024 |
| 362 | Murchison Oil And Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 363 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 364 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | May 2025 |
| 365 | Myco Industries, Inc. | Artesia, NM 88211 | Oil & Gas Operator | Feb 2015 |
| 366 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 367 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 368 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 369 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 370 | Newman Cubed, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | May 2025 |
| 371 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 372 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 373 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 374 | O'Brien, George H. Jr. | Midland, TX 79701 | Oil & Gas Operator | Jun 1994 |
| 375 | O'Neill Properties, LTD. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 376 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 377 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 378 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 379 | Odyssey Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Apr 1995 |
| 380 | Oga Operating L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2000 |
| 381 | Ogx Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 382 | Oil Management Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2022 |
| 383 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 384 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 385 | Omega Operating, Inc. | Odessa, TX 79769 | Oil & Gas Operator | Mar 2001 |
| 386 | Omimex Energy, Inc. | Fort Worth, TX 76120 | Oil & Gas Operator | Jan 2025 |
| 387 | Orbit Crude, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 388 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 389 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 390 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 391 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 392 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 393 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 394 | P1 Energy, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 395 | P4 Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 396 | Pactola Development Co | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2004 |
| 397 | Page Exploration | Midland, TX 79701 | Oil & Gas Operator | Apr 2007 |
| 398 | Page Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 399 | Page Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2010 |
| 400 | Palo Petroleum Inc | Dallas, TX 75360 | Oil & Gas Operator | May 2025 |