| 301 | Linco Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Mar 2025 |
| 302 | Lincoln Energy Partners, LLC | South Dennis, MA 02660 | Oil Operator | Mar 2025 |
| 303 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 304 | Lindemann, James D. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 305 | Lindemann, Robert Operating | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 306 | Lindemann, W. L., DRLG. Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1994 |
| 307 | Lindemann, W.L., Oper. Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2006 |
| 308 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 309 | Lindenmuth & Associates, Etex | Austin, TX 78703 | Oil & Gas Operator | Jun 2002 |
| 310 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Mar 2025 |
| 311 | Linder, John G. Jr. | Gladewater, TX 75647 | Oil & Gas Operator | Apr 2005 |
| 312 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | Mar 2025 |
| 313 | Lindholm Oil, Inc. | Mathis, TX 78368 | Gas Operator | Sep 2002 |
| 314 | Lindley, J. R. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2002 |
| 315 | Lindow Oil & Gas, LLC | Caldwell, TX 77836 | Oil & Gas Operator | Mar 2025 |
| 316 | Lindsay Oil Operations | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2010 |
| 317 | Lindsay, Dick | Graham, TX 76450 | Oil & Gas Operator | May 2015 |
| 318 | Lindsay, Robert L. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1995 |
| 319 | Line Energy LLC | Columbus, NE 68601 | Oil Operator | Mar 2025 |
| 320 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 321 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 322 | Linop Corporation | Austin, TX 78728 | Oil & Gas Operator | Mar 2025 |
| 323 | Lion Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 324 | Lionheart Energy Corporation | Durango, CO 81301 | Oil & Gas Operator | Mar 2025 |
| 325 | Lipan Flats Production, L.L.C. | San Angelo, TX 76905 | Oil Operator | Mar 2025 |
| 326 | Liquid Petroleum Resources, Inc. | Amarillo, TX 79120 | Gas Operator | Mar 2025 |
| 327 | Lissner, Lindy | Jourdanton, TX 78026 | Oil & Gas Operator | Mar 2025 |
| 328 | Litchfield Production Co. | Nederland, TX 77627 | Oil & Gas Operator | Mar 2025 |
| 329 | Little & Whyte Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2008 |
| 330 | Little Cypress Oil & Gas, L.L.C. | Fullerton, CA 92834 | Oil Operator | Mar 2025 |
| 331 | Little Drop Oil Company | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 332 | Little Oil & Gas | Pampa, TX 79065 | Oil & Gas Operator | Mar 2025 |
| 333 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Dec 2024 |
| 334 | Little, Lou Operating Co., Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2014 |
| 335 | Little, Quintin Company,Inc.,The | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2025 |
| 336 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 337 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 338 | Live Oak Op & Production, L.L.C. | Austin, TX 78759 | Oil & Gas Operator | Nov 2011 |
| 339 | Live Oak Petroleum, Inc. | Dallas, TX 75251 | Gas Operator | Mar 2001 |
| 340 | Live Oak Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Mar 2025 |
| 341 | Live Oak/Operations, Inc. | Houston, TX 77019 | Gas Operator | Jul 2011 |
| 342 | Lively Energy & Development Corp | Boerne, TX 78015 | Oil & Gas Operator | May 2015 |
| 343 | Lively Exploration Company | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 344 | Lively Resources, Inc. | Houston, TX 77056 | Gas Operator | Dec 1998 |
| 345 | Livingston, David Oil Company | Haskell, TX 79521 | Oil & Gas Operator | Aug 2003 |
| 346 | Livingston, F. L. | Megargel, TX 76370 | Oil & Gas Operator | May 2018 |
| 347 | Lizard Lick Transport, LLC | Grandfalls, TX 79742 | Oil & Gas Operator | Mar 2025 |
| 348 | LKD Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2018 |
| 349 | LKKTX 2018, LLC | Burkburnett, TX 76354 | Oil Operator | Mar 2025 |
| 350 | LKM Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2024 |
| 351 | LKM Oil And Gas LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 352 | Llano Management Company, Inc. | El Campo, TX 77437 | Gas Operator | Oct 2001 |
| 353 | Llano Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 354 | Llewellin Operating Company, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2017 |
| 355 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 356 | Llog Exploration Offshore, Inc. | Covington, LA 70433 | Oil & Gas Operator | Aug 2004 |
| 357 | Llog Exploration Texas, L.P. | Covington, LA 70433 | Oil & Gas Operator | Mar 2025 |
| 358 | Llog Production Company | Metairie, LA 70005 | Oil & Gas Operator | Apr 1995 |
| 359 | Llox, L.L.C. | Covington, LA 70433 | Oil & Gas Operator | Mar 2025 |
| 360 | LLR Operating | Pampa, TX 79065 | Oil Operator | Mar 2025 |
| 361 | LLT Energy, Inc. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 362 | LMG Operating Company, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2007 |
| 363 | LMH Energy | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 364 | LMN Oil And Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Mar 2008 |
| 365 | LMP Exploration Operating, LLC | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Feb 2008 |
| 366 | LMP Petroleum, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Jan 2010 |
| 367 | LNH Oil Company | Midland, TX 79708 | Oil & Gas Operator | Jan 2006 |
| 368 | LNR Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 369 | Lobo Energy, Inc. | Laredo, TX 78044 | Oil & Gas Operator | Nov 1996 |
| 370 | Lobo Oil Company | Woodson, TX 76491 | Oil & Gas Operator | Sep 1999 |
| 371 | Lobo Operating, Inc. | Houston, TX 77077 | Oil & Gas Operator | Dec 2024 |
| 372 | Lobo Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 373 | Lobo Resources, LTD. | Houston, TX 77077 | Oil & Gas Operator | Apr 1994 |
| 374 | Locin Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 375 | Lockout Corporation | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 376 | Lode Holdings, LLC | Wichita Falls, TX 76301 | Oil Operator | Mar 2025 |
| 377 | Lodel Energy Resources Corporation | Austin, TX 78703 | Oil Operator | Mar 2025 |
| 378 | Lodestone Operating | Portland, TX 78374 | Oil & Gas Operator | Dec 2024 |
| 379 | Lodestone Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 380 | Lodi Drilling & Service Co. | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Mar 2025 |
| 381 | Lodi Operating Company LLC | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Mar 2025 |
| 382 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 383 | Lofton, W. A. | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 1998 |
| 384 | Log Operating, LLC | Eagle Pass, TX 78853 | Oil & Gas Operator | Mar 2025 |
| 385 | Logan Energy Co. | Cross Plains, TX 76443 | Oil & Gas Operator | Nov 1997 |
| 386 | Logas Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Mar 2025 |
| 387 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | Mar 2025 |
| 388 | Lolocav, LLC | Sonora, TX 76950 | Oil & Gas Operator | Mar 2025 |
| 389 | Loma Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2014 |
| 390 | Loma VIsta Farms | Floresville, TX 78114 | Oil & Gas Operator | Jun 2019 |
| 391 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 392 | Lomax Operating Company, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2011 |
| 393 | London Petroleum Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 394 | Lone Oak Energy Inc | Kyle, TX 78640 | Oil & Gas Operator | Mar 2025 |
| 395 | Lone Pine Production Assoc.,Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 1993 |
| 396 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 397 | Lone Star Land And Energy II LLC | Dallas, TX 75214 | Oil & Gas Operator | Jan 2020 |
| 398 | Lone Star Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 399 | Lone Star Oil Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2024 |
| 400 | Lone Star Operating Company | Pearsall, TX 78061 | Oil & Gas Operator | Mar 2025 |