| 12001 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 12002 | Wiley Lease Co., LTD. | Jourdanton, TX 78026 | Oil Operator | Dec 2024 |
| 12003 | Wilham Investments, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2020 |
| 12004 | Wilhite Productions | MC Dade, TX 78650 | Oil & Gas Operator | Oct 2012 |
| 12005 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Aug 2024 |
| 12006 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2024 |
| 12007 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2024 |
| 12008 | William Fleming Productions, LLC | Wichita Falls, TX 76305 | Oil Operator | Dec 2024 |
| 12009 | Williams Deville Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2024 |
| 12010 | Williams Oil Company | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 12011 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2024 |
| 12012 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 12013 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 12014 | Williams, A. Oil | Wichita Falls, TX 76308 | Oil Operator | Dec 2024 |
| 12015 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Dec 2024 |
| 12016 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 12017 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 12018 | Williams, H. E. | Houston, TX 77002 | Oil & Gas Operator | Dec 1994 |
| 12019 | Williams, W. R. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2013 |
| 12020 | Williams, W. R., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2024 |
| 12021 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 12022 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2024 |
| 12023 | Williamson Operating Co. | Uvalde, TX 78801 | Oil & Gas Operator | Dec 2024 |
| 12024 | Williamson Operating Co., LLC | Stamps, AR 71860 | Oil & Gas Operator | Dec 2024 |
| 12025 | Williamson, J. C. | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 12026 | Williamson, Ralph E. | Midland, TX 79702 | Oil & Gas Operator | Jan 2012 |
| 12027 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2024 |
| 12028 | Williford Petroleum LLC | Green CV SPGS, FL 32043 | Oil & Gas Operator | Dec 2024 |
| 12029 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 12030 | Willo Oil & Gas Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2020 |
| 12031 | Willow Bend Oil LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2024 |
| 12032 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 12033 | Willow Springs Prod. Serv.,LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 1997 |
| 12034 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 12035 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2024 |
| 12036 | Wills Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 12037 | Wills Oil Holdings, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 12038 | Willstar Energy GP, LLC | Houston, TX 77279 | Oil & Gas Operator | Sep 2013 |
| 12039 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | Jul 2024 |
| 12040 | Wilshire Oil Co. Of Texas | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2004 |
| 12041 | Wilson - Owens Production Co. | Longview, TX 75601 | Oil & Gas Operator | Nov 1998 |
| 12042 | Wilson Brothers Leasing Co., Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2015 |
| 12043 | Wilson Energy LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 12044 | Wilson Energy Resources LLC | Graham, TX 76450 | Oil Operator | Dec 2024 |
| 12045 | Wilson Exploration Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 1996 |
| 12046 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Dec 2024 |
| 12047 | Wilson Oil Co. | Houston, TX 77263 | Oil & Gas Operator | Dec 2024 |
| 12048 | Wilson Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Dec 2024 |
| 12049 | Wilson Operating Company LLC | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2024 |
| 12050 | Wilson Operating Service Inc | Brownfield, TX 79316 | Oil & Gas Operator | Aug 2003 |
| 12051 | Wilson Petroleum Co. | Springfield, MO 65803 | Oil & Gas Operator | Dec 2024 |
| 12052 | Wilson Resources, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2024 |
| 12053 | Wilson Well Service Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Dec 2024 |
| 12054 | Wilson, Billy R. | New Braunfels, TX 78130 | Oil & Gas Operator | Dec 2024 |
| 12055 | Wilson, Charles B., Jr., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2000 |
| 12056 | Wilson, David A. | Longview, TX 75606 | Oil & Gas Operator | Mar 1997 |
| 12057 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |
| 12058 | Wilson, Jerry L. | Ranger, TX 76470 | Oil & Gas Operator | Dec 2024 |
| 12059 | Wilson, Olan Max | Cisco, TX 76437 | Oil & Gas Operator | Dec 2024 |
| 12060 | Wilson, W. Corp. | Midland, TX 79705 | Oil & Gas Operator | Mar 1999 |
| 12061 | Wilson, W.W. Jr. Properties | Abilene, TX 79605 | Oil & Gas Operator | Jul 1995 |
| 12062 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 12063 | Wilson-Shab Corp. | Electra, TX 76360 | Oil & Gas Operator | Dec 2024 |
| 12064 | Wilton Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 1999 |
| 12065 | Wilton, Frank | Graham, TX 76450 | Oil & Gas Operator | Oct 2016 |
| 12066 | Wimberley Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2013 |
| 12067 | Wimco | Dallas, TX 75229 | Oil & Gas Operator | Jul 2008 |
| 12068 | Wimsco, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1994 |
| 12069 | Winchester Energy Operating Co. | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 12070 | Winchester Energy, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 12071 | Winchester Exploration, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Aug 2003 |
| 12072 | Winchester Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Dec 2024 |
| 12073 | Winchester Operating, Inc. | Bryan, TX 77808 | Oil & Gas Operator | Aug 2001 |
| 12074 | Winchester Production Co., LTD. | Shreveport, LA 71129 | Oil & Gas Operator | Sep 2008 |
| 12075 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 12076 | Winco Oil Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 12077 | Winco Petroleum Company | Richardson, TX 75080 | Oil & Gas Operator | Jan 2003 |
| 12078 | Wind River Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 12079 | Wind River Resources Inc | Tulsa, OK 74136-6381 | Oil & Gas Operator | Jun 2010 |
| 12080 | Windham Resources | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 12081 | Windham Resources, Inc. | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2004 |
| 12082 | Windham, L. E. | Rankin, TX 79778 | Oil & Gas Operator | Dec 1996 |
| 12083 | Windham, L.E. Estate Of | Midland, TX 79702 | Oil & Gas Operator | Mar 2012 |
| 12084 | Windmill Oil Company | Austin, TX 78747 | Oil & Gas Operator | Mar 2008 |
| 12085 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Dec 2024 |
| 12086 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | Dec 2024 |
| 12087 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 12088 | Windsor Exploration Company | Dallas, TX 75204 | Oil & Gas Operator | Jan 1994 |
| 12089 | Windsor Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2012 |
| 12090 | Windy Cove Energy II, LLC | Houston, TX 77079 | Oil & Gas Operator | Sep 2020 |
| 12091 | Wineglass Production, LLC | Ranger, TX 76470 | Oil Operator | Dec 2024 |
| 12092 | Wineland Oil - LLC | Hays, KS 67601 | Oil Operator | Jul 2024 |
| 12093 | Wineridge Inc. | Austin, TX 78747 | Oil Operator | Dec 2024 |
| 12094 | Winfield Operating Company | Dallas, TX 75214 | Oil & Gas Operator | Dec 2024 |
| 12095 | Winfrey Oil Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2016 |
| 12096 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 12097 | Wingrove Operating, LLC | Odessa, TX 79760 | Oil Operator | Dec 2024 |
| 12098 | Wingrove Well Service, Inc. | Lueders, TX 79533 | Oil & Gas Operator | Nov 2023 |
| 12099 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 12100 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |