| 901 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 902 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 903 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 904 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Feb 2026 |
| 905 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 906 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 907 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 908 | Whitehawk Production Company | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 909 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Dec 2025 |
| 910 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 911 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 912 | Wilbanks Reserve Corporation | Denver, CO 80203 | Oil & Gas Operator | Feb 2026 |
| 913 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 914 | Wild Cat Operating Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 915 | Wildcat Energy, LLC | Odessa, TX 79768 | Oil & Gas Operator | Jul 2021 |
| 916 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Feb 2026 |
| 917 | Williamson, Ralph E. | Midland, TX 79702 | Oil & Gas Operator | Jan 2012 |
| 918 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Feb 2026 |
| 919 | Wind River Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 920 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 921 | Windsor Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2012 |
| 922 | Winfield Operating Company | Dallas, TX 75214 | Oil & Gas Operator | Feb 2026 |
| 923 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 924 | Wiseman, B. W., Jr. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 925 | WJC, Inc. | Post, TX 79356 | Oil & Gas Operator | Feb 2026 |
| 926 | Wood Oil Company | Tulsa, OK 74103 | Gas Operator | Oct 1997 |
| 927 | Wood, McShane & Thams | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 928 | WTG Exploration | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 929 | WTG Exploration Inc | Midland, TX 79705 | Oil & Gas Operator | Dec 2023 |
| 930 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 931 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 932 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 933 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 934 | Yates Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 935 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 936 | Yucca Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 937 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 938 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 939 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 940 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 941 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 942 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |