| 701 | Leroy W. James | | Oil & Gas Operator | Oct 1991 |
| 702 | Les Miller | | Oil & Gas Operator | Dec 1991 |
| 703 | Lesco Corp. | | Oil Operator | Dec 2000 |
| 704 | Leshen Energy USA LLC | | Oil Operator | Jan 2025 |
| 705 | Lesikar, L. W. | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2006 |
| 706 | Leslie Oil & Gas Co Inc | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1991 |
| 707 | Lester Joan | Sand Springs, OK 74063 | Oil & Gas Operator | Apr 2026 |
| 708 | Let Production Company | | Oil Operator | Apr 2026 |
| 709 | Letog LLC | Orwell, OH 44076 | Oil & Gas Operator | Dec 2025 |
| 710 | Letwin & Kallison | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2004 |
| 711 | Lety Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2002 |
| 712 | Levant Energy LLC | Milton, MA 02186 | Oil Operator | Jul 2026 |
| 713 | Levee Oil LLC | Tuscola, TX 79562 | Oil Operator | Jul 2026 |
| 714 | Levengood Oil & Gas(Us)In | Dover, OH 44621-2900 | Oil & Gas Operator | Dec 1997 |
| 715 | Levens, C. H. | Water Valley, TX 76958 | Oil & Gas Operator | May 2010 |
| 716 | Leverage Operating, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Dec 2021 |
| 717 | Levi Oil Company | Wichita, KS 67218 | Oil & Gas Operator | Nov 1993 |
| 718 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 719 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 720 | Levisay Operating Co. | Brownwood, TX 76801 | Oil & Gas Operator | Jul 2026 |
| 721 | Lewbet Inc | Perry, OK 73077 | Oil & Gas Operator | Aug 2024 |
| 722 | Lewis & Clark Exploration | | Oil Operator | Feb 1989 |
| 723 | Lewis & Hays | Albany, TX 76430 | Oil & Gas Operator | Feb 2002 |
| 724 | Lewis & Manziel | | Oil Operator | Apr 1989 |
| 725 | Lewis A. Hembree Production Company | Shawnee, OK 74801 | Oil & Gas Operator | Apr 2026 |
| 726 | Lewis Energy LLC | Tulsa, OK 74159 | Oil Operator | Apr 2026 |
| 727 | Lewis Heirs 480, LLC | Bryson, TX 76427 | Oil & Gas Operator | Jul 2026 |
| 728 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 729 | Lewis James D Oil Company | Healdton, OK 73438 | Oil Operator | Apr 2026 |
| 730 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |
| 731 | Lewis Oil & Gas Of Galva, Inc. | Galva, KS 67443 | Oil Operator | Mar 2026 |
| 732 | Lewis Oil And Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 733 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2026 |
| 734 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Apr 2026 |
| 735 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Jul 2026 |
| 736 | Lewis Petro Properties, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2026 |
| 737 | Lewis Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 1995 |
| 738 | Lewis Williams | | Oil & Gas Operator | Feb 1991 |
| 739 | Lewis Yale H | | Oil & Gas Operator | Aug 1986 |
| 740 | Lewis, Beverly J | | Oil Operator | Feb 2026 |
| 741 | Lewis, Bryan | Andover, NY 14806 | Oil & Gas Operator | Dec 2025 |
| 742 | Lewis, Freddie | | Oil Operator | Dec 2023 |
| 743 | Lewis, James B. Land & Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Nov 1998 |
| 744 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 745 | Lewis, T. K. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jul 2026 |
| 746 | Lewis, William T. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 747 | Lex And Lace Petroleum, LLC | Houston, TX 77269 | Oil Operator | Jul 2026 |
| 748 | Lexgas, Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Jul 2026 |
| 749 | Lexico Exploration | | Oil Operator | Mar 1986 |
| 750 | Lexicon Resources Corporation | | Oil & Gas Operator | Apr 1986 |
| 751 | Lexus Gas Corporation | Roanoke, TX 76262 | Oil & Gas Operator | Jul 2005 |
| 752 | LG&S Oil Company, LLC | Lovington, NM 88260 | Oil Operator | Feb 2026 |
| 753 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2026 |
| 754 | LGS Exploration Program | | Gas Operator | Jul 1990 |
| 755 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 756 | LH Oil, LLC | Ottawa, KS 66067 | Oil Operator | Mar 2026 |
| 757 | LH Operating, LLC | Fulshear, TX 77441 | Oil & Gas Operator | Mar 2026 |
| 758 | LHC Petroleum Corporation | | Oil & Gas Operator | Jul 2001 |
| 759 | Li'L Sugar Oil Company | | Oil Operator | Nov 2019 |
| 760 | Libertad Operating LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2026 |
| 761 | Liberty Enterpri | | Oil Operator | Jan 1987 |
| 762 | Liberty Exploration Co. | | Oil Operator | Apr 1987 |
| 763 | Liberty Head Petroleum, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Sep 2017 |
| 764 | Liberty National Corp | Dallas, TX 75206 | Oil Operator | Dec 2006 |
| 765 | Liberty Oil & Gas Co., Inc. | | Oil Operator | Feb 1991 |
| 766 | Liberty Oil & Gas Corp | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 767 | Liberty Oper & Compl, Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2022 |
| 768 | Liberty Operating Company, Inc. | Lake Dallas, TX 75065 | Oil & Gas Operator | Mar 2008 |
| 769 | Liberty Operating Company, LLC | | Oil & Gas Operator | May 2026 |
| 770 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 771 | Liberty Pioneer Energy Source, Inc | Provo, UT 84604 | Oil & Gas Operator | Oct 2021 |
| 772 | Liberty Production Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 773 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 774 | Liberty Resources LLC | | Oil & Gas Operator | May 2014 |
| 775 | Liberty Resources Management Co LLC | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 776 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 777 | Liberty Southern Energy LLC | | Oil & Gas Operator | Jan 2014 |
| 778 | Liboc, Inc. | New York, NY 10110 | Oil & Gas Operator | Dec 2009 |
| 779 | Libom Oil Company | Elmsford, NY 10523 | Oil & Gas Operator | Aug 2003 |
| 780 | Libra Oil Co., Inc. | | Oil & Gas Operator | Nov 1986 |
| 781 | Licking Valley Construction Co., Inc. | | Oil & Gas Operator | Dec 2016 |
| 782 | Liedtke Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2022 |
| 783 | Lif-Tex Oil Recovery, Inc. | Luling, TX 78648 | Oil Operator | Jul 2026 |
| 784 | Light Resources | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2013 |
| 785 | Lighthizer Charles O | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1997 |
| 786 | Lighthouse Exploration, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 2007 |
| 787 | Lighthouse Operating, Inc. | Corpus Christ, TX 78410 | Oil & Gas Operator | Jun 2021 |
| 788 | Lightner Harry A | | Oil & Gas Operator | May 2013 |
| 789 | Lightning Oil Co LTD | Mentor, OH 44060-4963 | Gas Operator | Dec 1998 |
| 790 | Lightning Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2026 |
| 791 | Lightning Productions, Inc. | | Oil & Gas Operator | Mar 1990 |
| 792 | Lignum Oil Co | | Oil & Gas Operator | Dec 1989 |
| 793 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 794 | Likover Oil Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2005 |
| 795 | Lil Dab Petroleum Inc | Ringling, OK 73456 | Oil Operator | Apr 2026 |
| 796 | Lil-Mor Oil Company | Tulsa, OK 74105 | Oil Operator | Dec 2000 |
| 797 | Lilis Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Aug 2017 |
| 798 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 799 | Lilley, C.C., Inc. | Dallardsville, TX 77332 | Oil & Gas Operator | Jul 2026 |
| 800 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |