| 201 | Steven A. Sayce | | Oil Operator | Jan 2021 |
| 202 | Stinnett Oil Company | | Oil Operator | Dec 1997 |
| 203 | Storm Industries | | Oil & Gas Operator | Dec 1988 |
| 204 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 205 | Synergy Oil & Gas LLC | | Oil & Gas Operator | Dec 2024 |
| 206 | Tej Ventures | | Oil & Gas Operator | Dec 2002 |
| 207 | Temple Resources LLC | | Oil Operator | Dec 2024 |
| 208 | Terra Exploration & Production Co. Inc. | | Oil & Gas Operator | Dec 2009 |
| 209 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 210 | The Lansdale Co. | | Oil & Gas Operator | Dec 2024 |
| 211 | The Port Of Long Beach | | Oil & Gas Operator | Dec 1997 |
| 212 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Jan 2025 |
| 213 | Thomas R. Banks | | Oil Operator | Dec 2024 |
| 214 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 2024 |
| 215 | Thums Long Beach Co. | | Oil & Gas Operator | Dec 2024 |
| 216 | Tidelands Oil Production Co. | | Oil & Gas Operator | Dec 2024 |
| 217 | Timco Oil Co. | | Oil & Gas Operator | Dec 1987 |
| 218 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Mar 2025 |
| 219 | TJ Scott Family Investments LLC | | Oil & Gas Operator | Dec 2024 |
| 220 | Topko N. Wilmington Prtnrship. | | Oil & Gas Operator | Dec 1995 |
| 221 | Torrance Petroleum Inc. | | Oil & Gas Operator | Dec 2003 |
| 222 | Tosco Enhanced Oil Recovery Corporation | | Oil Operator | Dec 1981 |
| 223 | Transpac Petroleum Inc. | | Oil & Gas Operator | Dec 1995 |
| 224 | Trio Petroleum LLC | | Oil & Gas Operator | Dec 2024 |
| 225 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 226 | Union Development Company Inc | | Oil & Gas Operator | Dec 1992 |
| 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 | Venoco LLC | | Oil & Gas Operator | Dec 2024 |
| 230 | Vintage Production California LLC | | Oil & Gas Operator | Jun 2016 |
| 231 | Vortex Energy & Minerals LTD. | | Oil & Gas Operator | Dec 1997 |
| 232 | W. J. Hamilton Operator | | Oil Operator | Aug 1978 |
| 233 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 234 | Wat Khmer Temple* | | Oil Operator | Dec 2003 |
| 235 | Watt Mineral Holdings LLC | | Oil Operator | Dec 2024 |
| 236 | Wayne Ballinger | | Oil & Gas Operator | Dec 2000 |
| 237 | West Energy Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 238 | Western Avenue Properties | | Oil & Gas Operator | Dec 1993 |
| 239 | Western Discovery USA Inc. | | Oil & Gas Operator | Jan 2018 |
| 240 | Yoelin Family Trust | | Oil & Gas Operator | Dec 2024 |
| 241 | Yunker Oil Co. | | Oil & Gas Operator | Dec 1986 |