| 1 | L & D, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 2 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 3 | Lackey, William H. Oil And Gas | Shawnee, OK 74804 | Oil & Gas Operator | Feb 2024 |
| 4 | Ladd Operating Company | Midland, TX 79711 | Oil & Gas Operator | Mar 2008 |
| 5 | Lake Crystal Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Oct 2025 |
| 6 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 7 | Landmark Ip, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 8 | Landrick O & G Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 9 | Langford & Brigham Operating LLC | Austin, TX 78730 | Oil & Gas Operator | Oct 2025 |
| 10 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 11 | Laredo Petroleum, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 12 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Oct 2025 |
| 13 | Leeper Oil Exp. & Prod. Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2005 |
| 14 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 15 | Lemon, Richard F. Jr. | Carrollton, TX 75006 | Oil & Gas Operator | Oct 2025 |
| 16 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 17 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 18 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 19 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 20 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 21 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 22 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 23 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |