| 101 | L. W. Snuffy McCartney | | Oil Operator | Jul 2015 |
| 102 | L.C. Coon Production Co. | | Oil Operator | Apr 1995 |
| 103 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 104 | L.J. Exploration, Inc. | | Oil & Gas Operator | Dec 2020 |
| 105 | L.J. Resources, LLC | Graham, TX 76450 | Gas Operator | Jul 2025 |
| 106 | L.J.M. Corporation | Houston, TX 77025 | Oil & Gas Operator | Jun 2012 |
| 107 | L.K. Energies, Inc. | | Oil & Gas Operator | Dec 2002 |
| 108 | L.L. Oil Company | Freer, TX 78357 | Oil & Gas Operator | Jul 2025 |
| 109 | L.L. Tuck | | Oil Operator | Jan 2001 |
| 110 | L.O.G. Energy Exploration, LTD. | Laredo, TX 78041 | Oil & Gas Operator | Jul 2025 |
| 111 | L.S.E. Energy-V.P. Smith | | Oil Operator | Mar 1988 |
| 112 | L.T.D. Explorations Inc. | Alice, TX 78333 | Oil & Gas Operator | Jul 2025 |
| 113 | L2SG Production, LLC | Nocona, TX 76255 | Oil Operator | May 2020 |
| 114 | L7 Energy LLC | Wichita Falls, TX 76308 | Oil Operator | Jul 2025 |
| 115 | La Aceite Energy, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jul 2025 |
| 116 | La Campana, Inc. | Port Aransas, TX 78373 | Oil & Gas Operator | Jul 2025 |
| 117 | La Chalk Gathering System | | Oil Operator | Jan 2006 |
| 118 | La Coastal Pet.Services Co Inc | | Oil & Gas Operator | Dec 1982 |
| 119 | La Delta Farms Oil Company LLC | | Oil & Gas Operator | Dec 2024 |
| 120 | La Gas Dev Corp/Araxas | | Oil & Gas Operator | Dec 2001 |
| 121 | La Honda Fields Limited Partnership | | Oil & Gas Operator | Dec 2021 |
| 122 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 123 | La Jolla Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Jul 2025 |
| 124 | La Land Co. | | Oil Operator | Dec 1989 |
| 125 | La Mar, Paul W. | Nocona, TX 76255 | Oil & Gas Operator | May 1995 |
| 126 | La Mesa Production, Inc. | | Oil & Gas Operator | Apr 2004 |
| 127 | La Paloma Generating Company LLC | | Oil & Gas Operator | Dec 2000 |
| 128 | La Parrita Oil & Gas, Inc. | Rosenberg, TX 77471 | Oil & Gas Operator | May 2002 |
| 129 | La Plata Gathering System Inc | Dallas, TX 75206 | Gas Operator | Nov 2023 |
| 130 | La Prele Exploration | | Oil & Gas Operator | Oct 1979 |
| 131 | La Roca Energy, LP | Dallas, TX 75207 | Oil & Gas Operator | May 2024 |
| 132 | La Ronya Oil & Gas | George West, TX 78022 | Gas Operator | Jul 2025 |
| 133 | La Sara Operating Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 134 | La Vernia Oil | La Vernia, TX 78121 | Oil Operator | Jul 2025 |
| 135 | La Vernia Oil Co. | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2003 |
| 136 | La Veta Oil & Gas, LLC | Middleburg, VA 20118 | Oil Operator | Mar 2025 |
| 137 | La VIda Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1993 |
| 138 | La. Fete Oil & Gas, Inc. | | Oil & Gas Operator | May 1995 |
| 139 | La. Gas Production, L.C. | | Gas Operator | Sep 2018 |
| 140 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 141 | La. Mining & Minerals, Inc. | | Oil & Gas Operator | Jul 2000 |
| 142 | La. Nap. Inc. Lanlock Res Inc | | Oil Operator | Feb 1995 |
| 143 | La. Onshore Properties Inc. | | Oil & Gas Operator | Dec 2000 |
| 144 | La.-TX. Operating, Inc. | | Oil & Gas Operator | May 1998 |
| 145 | La.Gas Service Expl. Program | | Gas Operator | Dec 1989 |
| 146 | Labarge Minerals Inc | Labarge, WY 83123 | Oil & Gas Operator | Jan 2020 |
| 147 | Labelle Petroleum, Inc. | | Oil & Gas Operator | Oct 1990 |
| 148 | Laben, David Glenn & Janice W. | Darien Center, NY 14040 | Gas Operator | Dec 2024 |
| 149 | Labh Hospitality, Inc. | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 150 | Labo Oil Company Inc | Drumright, OK 74030-5619 | Oil & Gas Operator | Mar 2025 |
| 151 | Lace Operating | Fort Worth, TX 76114 | Oil & Gas Operator | Jun 1997 |
| 152 | Lacen Oil | | Oil Operator | Jan 2002 |
| 153 | Lachenmayr Oil C | | Oil Operator | Sep 1996 |
| 154 | Lachenmayr Oil LLC | Newton, KS 67114 | Oil & Gas Operator | Mar 2025 |
| 155 | Lackawanna City School District | Lackawanna, NY 14218 | Gas Operator | Dec 2024 |
| 156 | Lackey Danny | Kiefer, OK 74041-0702 | Oil & Gas Operator | Oct 2022 |
| 157 | Lackey Disposal | | Oil Operator | Jul 1994 |
| 158 | Lackey Milton | | Oil & Gas Operator | Feb 1995 |
| 159 | Lackey Raymond R | Lindsay, OK 73052 | Oil & Gas Operator | Jun 2015 |
| 160 | Lackey Raymond R & Assoc | Sulphur, OK 73086 | Oil & Gas Operator | Apr 2025 |
| 161 | Lackey WM Oil & Gas Oper Co | Shawnee, OK 74801 | Oil & Gas Operator | Jan 1994 |
| 162 | Lackey, Donna | Waxahachie, TX 75165 | Oil Operator | Oct 2019 |
| 163 | Lackey, William H. Oil And Gas | Shawnee, OK 74804 | Oil & Gas Operator | Feb 2024 |
| 164 | Laclede Operating Co. | Pampa, TX 79065 | Gas Operator | Aug 1999 |
| 165 | Lacy 03, LLC | Gonzales, TX 78629 | Oil & Gas Operator | Jul 2025 |
| 166 | Lacy Operations, LTD. | Longview, TX 75606 | Oil & Gas Operator | Oct 2012 |
| 167 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 168 | Lacy, J. W., Jr. | Midland, TX 79702 | Oil & Gas Operator | Dec 2007 |
| 169 | Lacy, R | Longview, TX 75606 | Oil Operator | Apr 1989 |
| 170 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 171 | Ladd & Lukowicz | | Oil & Gas Operator | May 1983 |
| 172 | Ladd LLC | El Reno, OK 73036 | Oil & Gas Operator | Nov 2018 |
| 173 | Ladd Oil & Gas Corporation | Midland, TX 79711 | Oil & Gas Operator | Dec 2021 |
| 174 | Ladd Operating Company | Midland, TX 79711 | Oil & Gas Operator | Mar 2008 |
| 175 | Ladd Petroleum C | | Oil & Gas Operator | Sep 1989 |
| 176 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 177 | Ladder Energy Company | Tulsa, OK 74120-4281 | Oil & Gas Operator | Jan 2018 |
| 178 | Laddex, LTD. | Amarillo, TX 79102 | Oil & Gas Operator | Jul 2025 |
| 179 | Lafayette Oilfield Contractors, Inc. | | Oil Operator | Dec 2024 |
| 180 | Lafonda Energy LLC | Vernon, TX 76384 | Oil Operator | Jul 2025 |
| 181 | Lagarto Company, The | Fredericksbrg, TX 78624 | Oil & Gas Operator | Apr 1995 |
| 182 | Lagerquist, Walter G., Jr. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2005 |
| 183 | Lagniappe Interest Inc | Evergreen, CO 80439 | Oil & Gas Operator | Jun 2006 |
| 184 | Lagniappe Interests, Inc. | | Oil & Gas Operator | Dec 2003 |
| 185 | Lagniappe Operating, LLC | | Oil Operator | Dec 2024 |
| 186 | Lagniappe Petrole, LLC | | Oil & Gas Operator | Mar 2025 |
| 187 | Lago Petroleum Co. | | Oil & Gas Operator | Jan 1992 |
| 188 | Lago VIsta Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 189 | Lagoon Water Logistics LLC | Oklahoma City, OK 73103 | Oil Operator | Jul 2024 |
| 190 | Laguna County Sanitation District | | Oil & Gas Operator | Dec 2003 |
| 191 | Laguna Oil & Gas Corp. | Weesatche, TX 77993 | Oil & Gas Operator | Jul 2025 |
| 192 | Laguna Petroleum Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1982 |
| 193 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 194 | Lahd Energy Inc | Canton, OH 44709 | Gas Operator | Dec 2009 |
| 195 | Lahoma Gas Company | | Gas Operator | Dec 1980 |
| 196 | Lahoma Operating, Inc. | | Oil & Gas Operator | May 2025 |
| 197 | Lahoma Production Inc | Jenks, OK 74037 | Oil & Gas Operator | Apr 2025 |
| 198 | Lainco Well Service | Hamlin, TX 79520 | Oil & Gas Operator | Dec 1996 |
| 199 | Lainco Well Service, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Aug 2011 |
| 200 | Lainco, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Jul 2025 |