| 201 | Syj Oil & Gas | San Antonio, TX 78209 | Oil Operator | Sep 2000 |
| 202 | Syj Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 203 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 204 | Texas Oil And Gas Operating, LLC | Friendswood, TX 77546 | Oil & Gas Operator | May 2025 |
| 205 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | May 2025 |
| 206 | Textroleum Production, Inc. | Lubbock, TX 79452 | Oil & Gas Operator | Mar 2008 |
| 207 | Thomas Exploration & Devel., Inc | Jourdanton, TX 78026 | Oil & Gas Operator | May 2025 |
| 208 | Three J Energy, Inc. | Seguin, TX 78155 | Oil & Gas Operator | May 2025 |
| 209 | Transamerica Energy Corp. | Atlanta, GA 30356 | Oil & Gas Operator | May 2025 |
| 210 | U. D. Man, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 211 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 212 | Vannatter, Louis E. | Medina, TX 78055 | Oil & Gas Operator | Dec 1996 |
| 213 | Vargas Oil & Gas | San Antonio, TX 78240 | Oil Operator | May 2025 |
| 214 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 215 | Wen-Be | Jourdanton, TX 78026 | Oil & Gas Operator | May 2025 |
| 216 | West Tuleta Operating Corp. | Tuleta, TX 78162 | Oil & Gas Operator | May 2019 |
| 217 | White Stride LLC | Piedmont, OK 73078 | Oil & Gas Operator | May 2025 |
| 218 | Wiley Lease Co., LTD. | Jourdanton, TX 78026 | Oil Operator | May 2025 |
| 219 | WJC, Inc. | Post, TX 79356 | Oil & Gas Operator | May 2025 |
| 220 | WSM | New Braunfels, TX 78132 | Oil Operator | May 2025 |
| 221 | York & Price Petroleum Corp. | San Antonio, TX 78218 | Oil & Gas Operator | Jul 2004 |
| 222 | Yturri, Robert & John | San Antonio, TX 78205 | Oil & Gas Operator | Aug 2003 |
| 223 | Zaf Oil | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2002 |