| 101 | Landor Oil Co. | San Marcos, TX 78666 | Oil Operator | Oct 2025 |
| 102 | Landreth, Robert E. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 103 | Landrick O & G Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 104 | Landrum Petroleum Co., Inc. | Burkburnett, TX 76354 | Oil Operator | Mar 2008 |
| 105 | Landrum West, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 1997 |
| 106 | Landrum, W. A. | Byers, TX 76357 | Oil & Gas Operator | Apr 2002 |
| 107 | Lane Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 108 | Lane, Lloyd L. | Buffalo, TX 75831 | Oil Operator | Oct 2025 |
| 109 | Laneer Resources Company | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 110 | Lanexco, Inc. | Sealy, TX 77474 | Oil & Gas Operator | Oct 2025 |
| 111 | Langford & Brigham Operating LLC | Austin, TX 78730 | Oil & Gas Operator | Oct 2025 |
| 112 | Langford Production Company, LLC | Haskell, TX 79521 | Oil & Gas Operator | Oct 2025 |
| 113 | Langford, G. E. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2002 |
| 114 | Langford, R. C. Operating Co. | Rule, TX 79547 | Oil & Gas Operator | Mar 1994 |
| 115 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 116 | Lankford Oil Co. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1999 |
| 117 | Lankford, Dan L. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 118 | Lapco Oil & Gas Company | Houston, TX 77069 | Oil & Gas Operator | Oct 2015 |
| 119 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 120 | Lapis Operating, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jul 2015 |
| 121 | Laquey, E. C. | Refugio, TX 78377 | Oil & Gas Operator | Aug 2003 |
| 122 | Larae Operations | Luling, TX 78648 | Oil Operator | Oct 2025 |
| 123 | Larance Engineering Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Jan 1996 |
| 124 | Laredo Energy | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 125 | Laredo Energy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2022 |
| 126 | Laredo Energy, LP | Houston, TX 77040 | Oil & Gas Operator | Oct 2003 |
| 127 | Laredo Petroleum - Dallas, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 2014 |
| 128 | Laredo Petroleum, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 129 | Large Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Oct 2025 |
| 130 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 131 | Lariat Land & Exploration, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 132 | Lariat Resources, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | May 2022 |
| 133 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Oct 2025 |
| 134 | Larison Oil Company | Katy, TX 77494 | Oil & Gas Operator | Oct 2025 |
| 135 | Laroca Resources, LTD | Austin, TX 78709 | Oil & Gas Operator | Oct 2025 |
| 136 | Laroco LLP | Woodsboro, TX 78393 | Oil & Gas Operator | Mar 2008 |
| 137 | Laron Oil Corporation | Seguin, TX 78155 | Oil & Gas Operator | Jul 1997 |
| 138 | Larron Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2015 |
| 139 | Larry Oil, Inc. | Albany, TX 76430 | Oil & Gas Operator | Nov 2001 |
| 140 | Larson, Perry L Operating Co Inc | Dallas, TX 75382 | Oil & Gas Operator | Feb 2021 |
| 141 | Las Animas Production Company | Midland, TX 79705 | Oil & Gas Operator | Mar 1995 |
| 142 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 143 | Lasalle Marine Corporation | Houston, TX 77056 | Oil Operator | Aug 2003 |
| 144 | Lasater & Co, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Oct 2025 |
| 145 | Last Chance Operating LLC | Wortham, TX 76693 | Oil Operator | Oct 2025 |
| 146 | Last Dollar LLC | Big Lake, TX 76932 | Oil & Gas Operator | Oct 2025 |
| 147 | Last Mile Production, LLC | Southlake, TX 76092 | Oil & Gas Operator | Oct 2025 |
| 148 | Last Run, LLC | Rillito, AZ 85246 | Oil & Gas Operator | May 2020 |
| 149 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 150 | Latexo Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Feb 1997 |
| 151 | Latigo (Texas), LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 152 | Latigo Oil & Gas, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Jul 2025 |
| 153 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 154 | Latigo Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 155 | Latigo Petroleum, LLC | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 156 | Latimer, D. Gail Enterprises,Inc | Snyder, TX 79550 | Oil & Gas Operator | Jul 2004 |
| 157 | Laughlin, W. M. Estate | Premont, TX 78375 | Oil & Gas Operator | Jun 2003 |
| 158 | Laurel Fuel Company | Jackson, MS 39206 | Oil & Gas Operator | Dec 1996 |
| 159 | Lavaca Canyon Petroleum LLC | Houston, TX 77094 | Oil & Gas Operator | Oct 2025 |
| 160 | Lavaca River Operating Co., LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 161 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 162 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 163 | Lawbar Petroleum, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Aug 2003 |
| 164 | Lawco Osage Operating, LLC | Bentonville, AR 72712 | Oil & Gas Operator | Oct 2025 |
| 165 | Lawlis Oil Company | Hamlin, TX 79520 | Oil & Gas Operator | Oct 2025 |
| 166 | Lawrence Energy Company | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 167 | Lawrence, C. F. & Assoc. Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Oct 2025 |
| 168 | Laws Exploration LLC | Mineral Wells, TX 76067 | Oil & Gas Operator | Oct 2025 |
| 169 | Lawson Petroleum Co. | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2009 |
| 170 | Lawton, Jack Inc. | Sulphur, LA 70663 | Oil & Gas Operator | Dec 1995 |
| 171 | Lay, J. D. | Lockhart, TX 78644 | Oil & Gas Operator | May 1997 |
| 172 | Lay, Warren Leon | Lockhart, TX 78644 | Oil & Gas Operator | Aug 2023 |
| 173 | Layline Energy I LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2019 |
| 174 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 175 | Layton Energy Inc. | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 176 | Layton Enterprises, Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Apr 2007 |
| 177 | Lazarus Operating, LLC | Kilgore, TX 75663 | Oil Operator | Oct 2025 |
| 178 | LBN Oil Co., Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | May 1998 |
| 179 | Lbo Energy, Inc. | Kentfield, CA 94914 | Gas Operator | Nov 2002 |
| 180 | LC Operating, LLC | Burkburnett, TX 76354 | Oil & Gas Operator | Oct 2025 |
| 181 | LCT Energy, LP | Lewisville, AR 71845 | Oil & Gas Operator | Oct 2025 |
| 182 | LCX Energy, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2010 |
| 183 | LDF Energy, LLC | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 184 | LDX Operating Company, LLC. | Amarillo, TX 79102 | Oil & Gas Operator | Oct 2025 |
| 185 | Le Bas Operating Company, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2000 |
| 186 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 187 | Le Norman Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2019 |
| 188 | Leach, D.L.,Jr. | Edna, TX 77957 | Gas Operator | Oct 2007 |
| 189 | Leading Edge Energy LLC | San Antonio, TX 78205 | Oil Operator | Oct 2025 |
| 190 | Leahy Oil, LLC | Arlington, TX 76006 | Oil Operator | Oct 2025 |
| 191 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Oct 2025 |
| 192 | Lebow, Marvin E. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1997 |
| 193 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 194 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 195 | Ledbetter, Jerald D. Estate Of | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 196 | Ledbetter, Jerald D. Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2007 |
| 197 | Ledbetter, Morris | Abilene, TX 79605 | Oil & Gas Operator | Jun 2005 |
| 198 | Ledbetter, O. H. | Albany, TX 76430 | Oil & Gas Operator | Mar 1997 |
| 199 | Ledger Operating Corporation | Abilene, TX 79601 | Oil Operator | Oct 2025 |
| 200 | Lee Brothers Oil Co. | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |