| 1 | L & L Resources, Inc. | Hays, KS 67601 | Oil Operator | Mar 1986 |
| 2 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 3 | Lacy Operations, LTD. | Longview, TX 75606 | Oil & Gas Operator | Oct 2012 |
| 4 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 5 | Lakehills Production, Inc. | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 6 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Feb 2026 |
| 7 | Lamb, James L., Jr. | Austin, TX 78750 | Oil & Gas Operator | Mar 2016 |
| 8 | Laneer Resources Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 9 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 10 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Feb 2026 |
| 11 | Las Animas Production Company | Midland, TX 79705 | Oil & Gas Operator | Mar 1995 |
| 12 | Last Mile Production, LLC | Southlake, TX 76092 | Oil & Gas Operator | Feb 2026 |
| 13 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 14 | Lawrence, C. F. & Assoc. Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Feb 2026 |
| 15 | LCX Energy, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2010 |
| 16 | Lee Production Co. | Monahans, TX 79756 | Oil & Gas Operator | Feb 2026 |
| 17 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 18 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 19 | Letwin & Kallison | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2004 |
| 20 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 21 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 22 | Limestone Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2011 |
| 23 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 24 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 25 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 26 | Lion Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 27 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 28 | Llano Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 29 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | Feb 2026 |
| 30 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 31 | Lone Star Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 32 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 33 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 34 | Lpes, Inc. | Provo, UT 84604 | Oil & Gas Operator | Nov 2018 |
| 35 | LRR Pecos Valley, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 36 | LT Oil Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 37 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Feb 2026 |
| 38 | LTS Oil & Gas A | Lubbock, TX 79424 | Oil & Gas Operator | Feb 2026 |
| 39 | Luxe Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2021 |
| 40 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 41 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 42 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |