| 201 | Louisiana-Hunt Petroleum Corp. | | Oil & Gas Operator | Dec 1985 |
| 202 | Loutex Energy, Inc. | Shrevesport, LA 71101 | Oil & Gas Operator | Apr 1992 |
| 203 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 204 | Lower Lafourche Corporation | | Oil & Gas Operator | Dec 1996 |
| 205 | Lowmar Exploration Co. | | Oil & Gas Operator | Feb 1990 |
| 206 | Loyd E. Simar | | Oil & Gas Operator | Aug 2001 |
| 207 | LPB Oil Company | | Oil & Gas Operator | Apr 1991 |
| 208 | Lse Energy Co. | | Oil Operator | Mar 1989 |
| 209 | Lse Energy Operating Co. Inc. | | Oil Operator | Jun 1996 |
| 210 | LTX Productions, Inc. | Houston, TX 77095 | Oil & Gas Operator | Jul 2008 |
| 211 | Luca Operation, LLC | | Oil & Gas Operator | Feb 2016 |
| 212 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Feb 2025 |
| 213 | Lucky Strike Production LLC | | Oil Operator | Jul 2024 |
| 214 | Luffey Gas Corp. | | Gas Operator | Dec 2008 |
| 215 | Luffey Gas Corp.-Graff | | Gas Operator | Oct 1994 |
| 216 | Luffey-Stinson Gas Corporation | | Gas Operator | Sep 2018 |
| 217 | Luray Oil Co., L.L.C. | | Oil Operator | Jul 2024 |
| 218 | Lusk & Lusk, Inc. | | Oil & Gas Operator | Jul 1984 |
| 219 | Luther W. Davis | | Oil & Gas Operator | Jun 1996 |
| 220 | LVW, Inc. | | Oil & Gas Operator | Jun 2024 |
| 221 | Lwood Energy, Inc. | | Oil Operator | Dec 2002 |
| 222 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 223 | Lyle Cashion Company | | Oil & Gas Operator | Sep 1989 |
| 224 | Lymac Exploration And Production, LLC | | Oil & Gas Operator | Jul 2016 |
| 225 | Lyn-Que Oil & Gas, Inc. | | Oil Operator | Sep 1992 |
| 226 | Lynal, Inc. | | Oil & Gas Operator | Oct 1988 |
| 227 | Lynal, Inc.- Michel T Halbouty | | Oil & Gas Operator | Oct 1984 |
| 228 | Lyons Pet., McCain & Jackson | | Oil & Gas Operator | Dec 1981 |
| 229 | Lyons Petroleum Inc.-Dykes | | Oil & Gas Operator | Oct 1988 |
| 230 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 231 | Lyons, Hilliard & Watson, Inc. | | Oil & Gas Operator | Jan 1989 |