| 201 | Staley Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Jan 2022 |
| 202 | Stanolind Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Apr 2008 |
| 203 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 204 | Strawn Petroleum Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 205 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 2025 |
| 206 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2025 |
| 207 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 208 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |
| 209 | Talbott, Stan C. | Midland, TX 79701 | Oil & Gas Operator | Feb 2005 |
| 210 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 211 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Jul 2025 |
| 212 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Jul 2025 |
| 213 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 214 | Texland Petroleum Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2003 |
| 215 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 216 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 217 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 218 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 219 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 220 | Tidwell Production Company | Sonora, TX 76950 | Oil & Gas Operator | Jul 2025 |
| 221 | Toc Energy Resources, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Jul 2025 |
| 222 | Triple G Oil & Gas | Sonora, TX 76950 | Oil & Gas Operator | Oct 2022 |
| 223 | Tucker Drilling Company, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Jul 1996 |
| 224 | Tug Hill Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2021 |
| 225 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2025 |
| 226 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 227 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 228 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 229 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 230 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 231 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 232 | Venado Petroleum Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 2012 |
| 233 | Way, Ralph L., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 234 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 235 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 236 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 237 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 238 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 239 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 240 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 241 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 242 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 243 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Jul 2025 |
| 244 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |