| 201 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2024 |
| 202 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 203 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |
| 204 | Talbott, Stan C. | Midland, TX 79701 | Oil & Gas Operator | Feb 2005 |
| 205 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 206 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Dec 2024 |
| 207 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Dec 2024 |
| 208 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 209 | Texland Petroleum Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2007 |
| 210 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 211 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 212 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 213 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 214 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Dec 2024 |
| 215 | Tidwell Production Company | Sonora, TX 76950 | Oil & Gas Operator | Dec 2024 |
| 216 | Toc Energy Resources, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2024 |
| 217 | Triple G Oil & Gas | Sonora, TX 76950 | Oil & Gas Operator | Oct 2022 |
| 218 | Tucker Drilling Company, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Jul 1996 |
| 219 | Tug Hill Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2021 |
| 220 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2024 |
| 221 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 222 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 223 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 224 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 225 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 226 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 227 | Venado Petroleum Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 2012 |
| 228 | Way, Ralph L., Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 229 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 230 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 231 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 232 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jul 2024 |
| 233 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 234 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 235 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 236 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 237 | Young, Marshall R., Oil Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 238 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Dec 2024 |
| 239 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2024 |