| 901 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 902 | Weststar Exploration Co | Houston, TX 77027 | Oil & Gas Operator | Jan 2026 |
| 903 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2026 |
| 904 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 905 | Wildcat Energy, LLC | Odessa, TX 79768 | Oil & Gas Operator | Jul 2021 |
| 906 | Will McCasland Ind | Hobbs, NM 88240 | Gas Operator | Feb 2008 |
| 907 | William C Bahlburg | Dallas, TX 75240 | Oil & Gas Operator | Dec 1994 |
| 908 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 909 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 910 | Wishbone Texas Operating Co LLC | Houston, TX 77064 | Oil & Gas Operator | Jul 2019 |
| 911 | WJC, Inc. | Post, TX 79356 | Oil & Gas Operator | Sep 2026 |
| 912 | Wood, McShane & Thams | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 913 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 914 | WPX Energy Permian, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 915 | Wti 1993 LTD | FT. Collins, CO 80526 | Oil & Gas Operator | Apr 1995 |
| 916 | Wyatt Permian, LLC | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Sep 2026 |
| 917 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 918 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 919 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 920 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |
| 921 | XTO Permian Operating LLC. | Midland, TX 79705 | Oil & Gas Operator | Jun 2026 |
| 922 | Yarborough Oil & Gas L.P. | Midland, TX 79701 | Oil & Gas Operator | Oct 2000 |
| 923 | Yarbrough Oil LP | Eunice, NM 88231 | Oil & Gas Operator | Sep 2025 |
| 924 | Yates Drilling Co & Myco Industrial Inc | Artesia, NM 88210 | Oil & Gas Operator | Dec 1993 |
| 925 | Yates Drilling Company | Artesia, NM 88210 | Oil & Gas Operator | Dec 2021 |
| 926 | Yates Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Sep 2026 |
| 927 | Yeso Energy, Inc. | Roswell, NM 88202 | Oil & Gas Operator | May 2007 |
| 928 | Yucca Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 929 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 930 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 931 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 932 | Zimmerman Oil & Gas Exploration, Inc. | Houston, TX 77208 | Oil & Gas Operator | Jun 2026 |