| 701 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 702 | Western Products Corporation | Fairview, OK 73737 | Oil & Gas Operator | Nov 2004 |
| 703 | Western Properti | | Oil Operator | Oct 1987 |
| 704 | Western Reserve Exp | Perry, OH 44081 | Oil & Gas Operator | Dec 2003 |
| 705 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 706 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 707 | Western Reserves Oil Co Inc And Sullivan And Co | | Oil & Gas Operator | Jul 2001 |
| 708 | Western Resources And Clean Energy, LLC | Manti, UT 84642 | Oil & Gas Operator | Jan 2026 |
| 709 | Western Resources, Inc. | | Oil Operator | Jun 1994 |
| 710 | Western Resources{Wva}Inc | Chantilly, VA 22022 | Oil & Gas Operator | Dec 1994 |
| 711 | Western Sky Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 712 | Western Soil Conservation District | | Gas Operator | Nov 1992 |
| 713 | Western States International Inc. | | Oil & Gas Operator | Nov 2025 |
| 714 | Western Tank Trucks Inc | Hennessey, OK 73742 | Oil Operator | Jul 2011 |
| 715 | Westfall-Gooden Reserves LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Dec 2025 |
| 716 | Westfield Energy Corp. | | Oil & Gas Operator | Mar 1991 |
| 717 | Westgate Oil Com | | Oil Operator | Mar 1993 |
| 718 | Westgate Oil Company, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Dec 2025 |
| 719 | Westgate Petroleum, Inc. | Fritch, TX 79036 | Oil & Gas Operator | Nov 2001 |
| 720 | Westhall Associates, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Aug 1997 |
| 721 | Westico Energy Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2004 |
| 722 | Westinghouse Elec Co LLC | Monroeville, PA 15146-2808 | Gas Operator | Dec 2025 |
| 723 | Westlake Energy Consultants Corp | Thousand Oaks, CA 91362 | Oil & Gas Operator | Aug 2003 |
| 724 | Westlake Energy Consultants, Inc. | Westlake VIllage, CA 91362 | Gas Operator | Dec 2019 |
| 725 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 726 | Westlands Resources Corporation | Monrovia, CA 91016 | Oil & Gas Operator | Feb 2026 |
| 727 | Westmore Drillin | | Oil & Gas Operator | Oct 1995 |
| 728 | Westmore Drilling Company, Inc. | Lawrence, KS 66047 | Oil & Gas Operator | Dec 2019 |
| 729 | Westmoreland Gas, LLC | | Oil & Gas Operator | Dec 2021 |
| 730 | Westoil LLC | Austin, TX 78747 | Oil & Gas Operator | Feb 2026 |
| 731 | Weston Management & Operations Group | Centreville, MD 21617 | Oil Operator | May 1997 |
| 732 | Westover Production Co., LLC | Kermit, TX 79745 | Oil & Gas Operator | Feb 2026 |
| 733 | Westpark Petroleum, Inc. | Austin, TX 78755 | Oil & Gas Operator | Feb 2026 |
| 734 | Westphal Oil & Gas Inc | Fort Smith, AR 72901-2199 | Oil & Gas Operator | Feb 2015 |
| 735 | Westport Corporation | Houston, TX 77079 | Oil & Gas Operator | Aug 2003 |
| 736 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 737 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 738 | Westport Oil Com | | Oil Operator | Feb 1994 |
| 739 | Westport Petrole | | Oil Operator | Feb 1985 |
| 740 | Westport Petroleum Corporation | | Gas Operator | Sep 1985 |
| 741 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Feb 2026 |
| 742 | Westshore Operating Inc | Naples, FL 34109-0549 | Oil & Gas Operator | Dec 2011 |
| 743 | Westside Energy Op. Co., LP | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2008 |
| 744 | Westside Farming Co. Inc. | | Gas Operator | Dec 1995 |
| 745 | Westside Wells Inc | Altus, OK 73521 | Oil & Gas Operator | Nov 2020 |
| 746 | Weststar Exploration Co | Houston, TX 77027 | Oil & Gas Operator | Jan 2026 |
| 747 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 748 | Weststar Operating Company | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2015 |
| 749 | Weststar Resourc | | Oil Operator | Sep 1992 |
| 750 | Westwin Energy I, LP | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 751 | Westwind Exploration Company | Oklahoma City, OK 73123 | Oil & Gas Operator | Oct 1998 |
| 752 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 753 | Wetwick DRLG. & Prod. | Carlsbad, TX 76934 | Oil Operator | Feb 2026 |
| 754 | Wetzel Oil Company | Austin, TX 78738 | Oil & Gas Operator | May 2007 |
| 755 | Wetzel Producing Company | Duncan, OK 73533-4602 | Oil & Gas Operator | Nov 2025 |
| 756 | Weva Oil Corp. | | Oil & Gas Operator | Nov 2019 |
| 757 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Dec 2025 |
| 758 | Wexpro Development Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Nov 2025 |
| 759 | Wexpro II Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Nov 2025 |
| 760 | Weyerhaeuser Company | Crossett, AR 71635 | Oil & Gas Operator | Sep 1994 |
| 761 | Weyerman* Ralph & Beverly | | Gas Operator | Dec 2017 |
| 762 | WF Company, LTD. | Midland, TX 79705 | Oil & Gas Operator | Oct 1995 |
| 763 | WF Operating LLC | Bartlesville, OK 74003 | Oil Operator | May 2023 |
| 764 | WFMMS, Inc. | Batson, TX 77519 | Oil & Gas Operator | Feb 2026 |
| 765 | WFW Production Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 766 | WG Oil & Gas LLC | Okmulgee, OK 74447-7862 | Oil & Gas Operator | Dec 2022 |
| 767 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 768 | WG Operating, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | May 2012 |
| 769 | WGM Gas Co Inc | Creekside, PA 15732-8500 | Oil & Gas Operator | Dec 2025 |
| 770 | Wgo Resources, LLC | | Oil & Gas Operator | Dec 2025 |
| 771 | WGP-KHC, LLC | Houston, TX 77002 | Oil Operator | May 2017 |
| 772 | WGR, Inc. | Houston, TX 77046 | Gas Operator | Jul 2007 |
| 773 | Wgsi Enterprise LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Nov 2025 |
| 774 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 775 | Whatley, O. B. | Kilgore, TX 75662 | Oil & Gas Operator | Jun 1993 |
| 776 | Whatley, O.B. Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Feb 2026 |
| 777 | WHC Oper LLC | Commodore, PA 15729-9109 | Gas Operator | Dec 2025 |
| 778 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 779 | Wheatbelt Invest | | Oil Operator | Mar 1991 |
| 780 | Wheatland Oil & | | Oil & Gas Operator | Aug 1984 |
| 781 | Wheatland Oil & Gas, Inc. | Wichita, KS 67202 | Gas Operator | Jul 1997 |
| 782 | Wheatland Oil Inc | Enid, OK 73702-1032 | Oil & Gas Operator | Mar 2015 |
| 783 | Wheatley Equipment | Morrison, OK 73061-9345 | Oil & Gas Operator | Jul 2012 |
| 784 | Wheeler & Hanlin MFG Co Inc | Tulsa, OK 74148 | Oil Operator | Jun 1998 |
| 785 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Nov 2025 |
| 786 | Wheeler Energy, LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2026 |
| 787 | Wheeler Michael D | Newark, OH 43055 | Oil & Gas Operator | Dec 2024 |
| 788 | Wheeler Oil & Gas Inc | Tulsa, OK 74103-4293 | Oil & Gas Operator | Jan 2007 |
| 789 | Wheeler Oil Co. (A) | Amarillo, TX 79114 | Gas Operator | Apr 2001 |
| 790 | Wheeler Oil Company | Sperry, OK 74073-9417 | Oil & Gas Operator | Sep 2025 |
| 791 | Wheeler Oil, LTD | Isonville, KY 41149 | Oil & Gas Operator | Dec 2023 |
| 792 | Wheeler Operating Corporation | Fort Worth, TX 76109 | Oil & Gas Operator | Feb 2026 |
| 793 | Wheeler Richard Jr | Oklahoma City, OK 73112-8857 | Oil & Gas Operator | Mar 2005 |
| 794 | Whelan Brothers, Inc. | Oil City, LA 71061 | Oil & Gas Operator | May 2015 |
| 795 | Wheless Drilling Company | | Oil & Gas Operator | Dec 1989 |
| 796 | Wheless Drilling Company Et Al | | Oil & Gas Operator | Dec 1989 |
| 797 | Wheless DRLG Co &R.M.Bergstein | | Oil Operator | May 1986 |
| 798 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 799 | Wheless Industries-Pelto Oil | | Oil & Gas Operator | Dec 1989 |
| 800 | Whidbey Resources Inc | Hudson, OH 44236 | Oil & Gas Operator | Dec 2016 |