| 12101 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 12102 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 12103 | Williams, A. Oil | Wichita Falls, TX 76308 | Oil Operator | Jun 2026 |
| 12104 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Jun 2026 |
| 12105 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 12106 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 12107 | Williams, H. E. | Houston, TX 77002 | Oil & Gas Operator | Dec 1994 |
| 12108 | Williams, W. R. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2013 |
| 12109 | Williams, W. R., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2024 |
| 12110 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 12111 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 12112 | Williamson Operating Co. | Uvalde, TX 78801 | Oil & Gas Operator | Jun 2026 |
| 12113 | Williamson Operating Co., LLC | Stamps, AR 71860 | Oil & Gas Operator | Jun 2026 |
| 12114 | Williamson, J. C. | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 12115 | Williamson, Ralph E. | Midland, TX 79702 | Oil & Gas Operator | Jan 2012 |
| 12116 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 12117 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Jun 2026 |
| 12118 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 12119 | Willo Oil & Gas Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2020 |
| 12120 | Willow Bend Oil LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 12121 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 12122 | Willow Springs Prod. Serv.,LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 1997 |
| 12123 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 12124 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 12125 | Willowick Production LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 12126 | Wills Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 12127 | Wills Oil Holdings, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 12128 | Willstar Energy GP, LLC | Houston, TX 77279 | Oil & Gas Operator | Sep 2013 |
| 12129 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | Dec 2025 |
| 12130 | Wilshire Oil Co. Of Texas | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2004 |
| 12131 | Wilson - Owens Production Co. | Longview, TX 75601 | Oil & Gas Operator | Nov 1998 |
| 12132 | Wilson Brothers Leasing Co., Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2015 |
| 12133 | Wilson Energy LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 12134 | Wilson Energy Resources LLC | Graham, TX 76450 | Oil Operator | Jun 2026 |
| 12135 | Wilson Exploration Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 1996 |
| 12136 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Jun 2026 |
| 12137 | Wilson Oil Co. | Houston, TX 77263 | Oil & Gas Operator | Jun 2026 |
| 12138 | Wilson Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Jun 2026 |
| 12139 | Wilson Operating Company LLC | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2026 |
| 12140 | Wilson Operating Service Inc | Brownfield, TX 79316 | Oil & Gas Operator | Aug 2003 |
| 12141 | Wilson Petroleum Co. | Springfield, MO 65803 | Oil & Gas Operator | Jun 2026 |
| 12142 | Wilson Resources, Inc. | Longview, TX 75601 | Oil & Gas Operator | Jun 2026 |
| 12143 | Wilson Well Service Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Jun 2026 |
| 12144 | Wilson, Billy R. | New Braunfels, TX 78130 | Oil & Gas Operator | Jun 2026 |
| 12145 | Wilson, Charles B., Jr., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2000 |
| 12146 | Wilson, David A. | Longview, TX 75606 | Oil & Gas Operator | Mar 1997 |
| 12147 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |
| 12148 | Wilson, Jerry L. | Ranger, TX 76470 | Oil & Gas Operator | Jun 2026 |
| 12149 | Wilson, Olan Max | Cisco, TX 76437 | Oil & Gas Operator | Jun 2026 |
| 12150 | Wilson, W. Corp. | Midland, TX 79705 | Oil & Gas Operator | Mar 1999 |
| 12151 | Wilson, W.W. Jr. Properties | Abilene, TX 79605 | Oil & Gas Operator | Jul 1995 |
| 12152 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 12153 | Wilson-Shab Corp. | Electra, TX 76360 | Oil & Gas Operator | Jun 2026 |
| 12154 | Wilton Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 1999 |
| 12155 | Wilton, Frank | Graham, TX 76450 | Oil & Gas Operator | Oct 2016 |
| 12156 | Wimberley Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2013 |
| 12157 | Wimco | Dallas, TX 75229 | Oil & Gas Operator | Jul 2008 |
| 12158 | Wimsco, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1994 |
| 12159 | Winchester Energy Operating Co. | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 12160 | Winchester Energy, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 12161 | Winchester Exploration, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Aug 2003 |
| 12162 | Winchester Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Jun 2026 |
| 12163 | Winchester Operating, Inc. | Bryan, TX 77808 | Oil & Gas Operator | Aug 2001 |
| 12164 | Winchester Production Co., LTD. | Shreveport, LA 71129 | Oil & Gas Operator | Sep 2008 |
| 12165 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 12166 | Winco Oil Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jun 2026 |
| 12167 | Winco Petroleum Company | Richardson, TX 75080 | Oil & Gas Operator | Jan 2003 |
| 12168 | Wind River Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 12169 | Wind River Resources Inc | Tulsa, OK 74136-6381 | Oil & Gas Operator | Jun 2010 |
| 12170 | Windham Resources | Abilene, TX 79608 | Oil & Gas Operator | Jun 2026 |
| 12171 | Windham Resources, Inc. | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2004 |
| 12172 | Windham, L. E. | Rankin, TX 79778 | Oil & Gas Operator | Dec 1996 |
| 12173 | Windham, L.E. Estate Of | Midland, TX 79702 | Oil & Gas Operator | Mar 2012 |
| 12174 | Windmill Oil Company | Austin, TX 78747 | Oil & Gas Operator | Mar 2008 |
| 12175 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Jun 2026 |
| 12176 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | Jun 2026 |
| 12177 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 12178 | Windsor Exploration Company | Dallas, TX 75204 | Oil & Gas Operator | Jan 1994 |
| 12179 | Windsor Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2012 |
| 12180 | Windy Cove Energy II, LLC | Houston, TX 77079 | Oil & Gas Operator | Sep 2020 |
| 12181 | Wineglass Production, LLC | Ranger, TX 76470 | Oil Operator | Jun 2026 |
| 12182 | Wineland Oil - LLC | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 12183 | Wineridge Inc. | Austin, TX 78747 | Oil Operator | Jun 2026 |
| 12184 | Winfield Operating Company | Dallas, TX 75214 | Oil & Gas Operator | Jun 2026 |
| 12185 | Winfrey Oil Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2016 |
| 12186 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 12187 | Wingrove Operating, LLC | Odessa, TX 79760 | Oil Operator | Jun 2026 |
| 12188 | Wingrove Well Service, Inc. | Lueders, TX 79533 | Oil & Gas Operator | Nov 2023 |
| 12189 | Winn Exploration Co., Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Jun 2026 |
| 12190 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 12191 | Winright Resources Operating,LLC | Houston, TX 77007 | Oil & Gas Operator | Jun 2026 |
| 12192 | Winslow Operating Company, LLC | Austin, TX 78737 | Oil & Gas Operator | Jun 2026 |
| 12193 | Winslow, Harry C. | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2026 |
| 12194 | Winston Land & Cattle Co., Inc. | Lufkin, TX 75901 | Oil & Gas Operator | Feb 2001 |
| 12195 | Winston Land & Cattle I, LTD. | Lufkin, TX 75902 | Oil & Gas Operator | Nov 2014 |
| 12196 | Winwell, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2007 |
| 12197 | Wischkaemper, James K. | Shamrock, TX 79079 | Oil & Gas Operator | Aug 2023 |
| 12198 | Wischkaemper, Kenneth | Shamrock, TX 79079 | Oil & Gas Operator | Jun 2026 |
| 12199 | Wise Exploration | Perrin, TX 76486 | Oil & Gas Operator | Jun 2026 |
| 12200 | Wise Production Company | Bowie, TX 76230 | Oil & Gas Operator | Jun 2026 |