| 1 | L & J Oil Co. | Borger, TX 79007 | Oil & Gas Operator | Apr 1999 |
| 2 | L & K Oil | | Oil Operator | Oct 1997 |
| 3 | L & L Supply | | Oil Operator | Dec 1994 |
| 4 | L & N Co. | | Oil Operator | Jul 1991 |
| 5 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 6 | L & S Service Corp. | | Oil Operator | Jul 1989 |
| 7 | L & T Exploration | | Oil & Gas Operator | Dec 1987 |
| 8 | L & W Oil & Gas, Inc. | | Oil & Gas Operator | May 1994 |
| 9 | L And C Oil Company | | Oil Operator | Aug 1996 |
| 10 | L And L Production Company | Skellytown, TX 79080 | Oil & Gas Operator | Sep 1996 |
| 11 | L B Simmons Energy Inc | Midland, TX BAD ADDR | Oil & Gas Operator | Oct 1996 |
| 12 | L E Carpenter Oil & Gas, Inc. | | Oil & Gas Operator | Sep 1985 |
| 13 | L L & H E Kidd | | Gas Operator | Sep 1990 |
| 14 | L P C Energy, Inc. | | Oil & Gas Operator | Mar 1985 |
| 15 | L&N DRLG Co&K.D. Lankford, Jr | | Gas Operator | Aug 2006 |
| 16 | L'Oil Operating & Management Co., Inc. | | Oil & Gas Operator | Nov 2024 |
| 17 | L'Oil Operating And MGMT. Co. | | Oil & Gas Operator | Dec 2008 |
| 18 | L. A. West | | Gas Operator | Feb 2000 |
| 19 | L. C. Geer & Associates | | Oil & Gas Operator | Jan 1987 |
| 20 | L. D. McMullan | | Oil Operator | Jun 2023 |
| 21 | L. E. Gillespie | | Oil Operator | Sep 1984 |
| 22 | L. E. Hester | | Gas Operator | Oct 2004 |
| 23 | L. R. Fitzgerald | | Oil & Gas Operator | Feb 2015 |
| 24 | L. R. Resources II | | Oil & Gas Operator | Feb 1991 |
| 25 | L. W. Snuffy McCartney | | Oil Operator | Jul 2015 |
| 26 | L.C. Coon Production Co. | | Oil Operator | Apr 1995 |
| 27 | L.J. Exploration, Inc. | | Oil & Gas Operator | Dec 2020 |
| 28 | L.L. Oil Company | Freer, TX 78357 | Oil & Gas Operator | Feb 2026 |
| 29 | L.S.E. Energy-V.P. Smith | | Oil Operator | Mar 1988 |
| 30 | La Chalk Gathering System | | Oil Operator | Jan 2006 |
| 31 | La Coastal Pet.Services Co Inc | | Oil & Gas Operator | Dec 1982 |
| 32 | La Delta Farms Oil Company LLC | | Oil & Gas Operator | Dec 2024 |
| 33 | La Gas Dev Corp/Araxas | | Oil & Gas Operator | Dec 2001 |
| 34 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 35 | La Mesa Production, Inc. | | Oil & Gas Operator | Apr 2004 |
| 36 | La. Fete Oil & Gas, Inc. | | Oil & Gas Operator | May 1995 |
| 37 | La. Gas Production, L.C. | | Gas Operator | Sep 2018 |
| 38 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 39 | La. Mining & Minerals, Inc. | | Oil & Gas Operator | Jul 2000 |
| 40 | La. Nap. Inc. Lanlock Res Inc | | Oil Operator | Feb 1995 |
| 41 | La. Onshore Properties Inc. | | Oil & Gas Operator | Dec 2000 |
| 42 | La.-TX. Operating, Inc. | | Oil & Gas Operator | May 1998 |
| 43 | La.Gas Service Expl. Program | | Gas Operator | Dec 1989 |
| 44 | Labelle Petroleum, Inc. | | Oil & Gas Operator | Oct 1990 |
| 45 | Lace Operating | Fort Worth, TX 76114 | Oil & Gas Operator | Jun 1997 |
| 46 | Lacour & Nix | | Oil & Gas Operator | May 1986 |
| 47 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 48 | Lafayette Oilfield Contractors, Inc. | | Oil Operator | Dec 2024 |
| 49 | Lagniappe Interests, Inc. | | Oil & Gas Operator | Dec 2003 |
| 50 | Lagniappe Operating, LLC | | Oil Operator | Dec 2024 |
| 51 | Lago Petroleum Co. | | Oil & Gas Operator | Jan 1992 |
| 52 | Lago VIsta Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 53 | Lahoma Gas Company | | Gas Operator | Dec 1980 |
| 54 | Lahoma Operating, Inc. | | Oil & Gas Operator | Nov 2025 |
| 55 | Lake A, LTD. | | Oil Operator | May 1998 |
| 56 | Lake Racourci Gath Sys, LLC | | Oil Operator | May 2004 |
| 57 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Jul 2017 |
| 58 | Lakeshore Petroleum Corp. | | Oil & Gas Operator | Dec 1992 |
| 59 | Lakeside Exploration Corp. | | Gas Operator | Aug 1986 |
| 60 | Lakeside Resources | | Oil & Gas Operator | Mar 1989 |
| 61 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Nov 2025 |
| 62 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 63 | Lamar Hunt Trust Est Etal | | Oil & Gas Operator | Aug 1996 |
| 64 | Lamar Hunt Trust Est. | | Oil & Gas Operator | Mar 1978 |
| 65 | Lamar Matlock | | Oil Operator | Jan 2025 |
| 66 | Lamar Oil & Gas, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2026 |
| 67 | Lamar Smith | | Oil Operator | Aug 1991 |
| 68 | Lamson Petroleum Corporation | | Oil & Gas Operator | Mar 1993 |
| 69 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 70 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 71 | Lance Gas & Oil Productions | | Oil & Gas Operator | Jan 2025 |
| 72 | Lancer Resources Company | | Oil & Gas Operator | Jan 1998 |
| 73 | Land & Natural Res. Dev., Inc. | | Oil & Gas Operator | Apr 2007 |
| 74 | Landmark Venture Group No. 1, Inc. | | Oil & Gas Operator | Jan 2025 |
| 75 | Landmark Venture Group, Inc. | | Oil Operator | Dec 2008 |
| 76 | Lanford Drilling Co., Inc. | | Oil Operator | Jun 1996 |
| 77 | Lankford & Nance | | Gas Operator | Dec 2010 |
| 78 | Lanmarc Resources | | Oil Operator | Dec 2003 |
| 79 | Lanoco, Inc. | | Oil & Gas Operator | Sep 2002 |
| 80 | Lapis Operating, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jul 2015 |
| 81 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 82 | Lark Production, Inc. | | Oil & Gas Operator | Mar 2023 |
| 83 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 84 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 85 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 86 | Laster Welding And Well Serv, Inc. | | Gas Operator | Jul 2020 |
| 87 | Lastrada Oil And Gas LTD | | Oil & Gas Operator | May 1992 |
| 88 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 89 | Latexo Oil & Gas Co. | | Oil Operator | Sep 1986 |
| 90 | Latham & Bonner | | Oil Operator | Aug 1987 |
| 91 | Latham Exploration Company Inc | | Oil & Gas Operator | Aug 1992 |
| 92 | Latham Production & Service Co | | Oil Operator | Jul 1989 |
| 93 | Latham, Bonner & Hall | | Oil Operator | Mar 1988 |
| 94 | Laurel Operating Company | Stillwater, OK 74074-3025 | Oil & Gas Operator | Nov 2025 |
| 95 | Lavaca River Operating Co., LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 96 | Lavino Oil And Gas Company | | Oil & Gas Operator | Aug 1989 |
| 97 | Lawson Engineering, Inc. | | Oil & Gas Operator | Dec 1984 |
| 98 | Lax, Inc. | | Oil & Gas Operator | Nov 1987 |
| 99 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 100 | Layton Energy Inc. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |