| 201 | Rogers Oil Co. | Bronson, KS 66716 | Oil & Gas Operator | Sep 1995 |
| 202 | Roxanna Acadia, LLC | | Oil & Gas Operator | May 2023 |
| 203 | S. S. Tatum | | Oil Operator | Aug 1999 |
| 204 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 205 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 206 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 207 | San Miguel Oil & Gas, Inc. | | Oil & Gas Operator | Jan 1993 |
| 208 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 209 | Shufflin Energy | | Oil & Gas Operator | Sep 2011 |
| 210 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 211 | Smith Oil And Gas Co | Wichita Falls, TX 76310 | Oil Operator | Dec 2010 |
| 212 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 213 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 214 | Steaua Romana (Us) Inc. | | Oil & Gas Operator | Apr 1987 |
| 215 | Strike Energy Corp | Blackwell, OK 74631 | Oil & Gas Operator | Jul 2023 |
| 216 | Sun Exploration & Production Co | | Oil & Gas Operator | Jan 1990 |
| 217 | Suncoast Investments Co., Inc. | Plano, TX 75074 | Oil & Gas Operator | Oct 2001 |
| 218 | Suncoast Technical SVCS., Inc. | | Oil & Gas Operator | Dec 2011 |
| 219 | Super Energy Inc. | | Oil & Gas Operator | Oct 1993 |
| 220 | Superior Resources Corporation | | Oil Operator | Apr 2006 |
| 221 | SV Energy Company, LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Mar 2017 |
| 222 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 223 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 224 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 225 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 226 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 227 | T.O. Greer Productions | | Oil & Gas Operator | Aug 2013 |
| 228 | Tallgrass Production Company LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2014 |
| 229 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 230 | Texas T Oil Co. | | Oil & Gas Operator | Apr 1990 |
| 231 | Texegy Operating Company LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 232 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 233 | The B&B Oil Co Of Sabine Inc | | Oil Operator | Jun 1982 |
| 234 | The Goro Corporation | | Oil & Gas Operator | Jul 1978 |
| 235 | Thornton & Brooks, Inc. | | Oil & Gas Operator | Oct 1990 |
| 236 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 237 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Sep 2025 |
| 238 | Toledo Bend Well Service | | Oil Operator | Aug 2000 |
| 239 | Trans-Pacific Oil & Gas Inc. | | Oil & Gas Operator | Mar 1982 |
| 240 | Trebole Operating Company | | Oil Operator | Jul 1979 |
| 241 | Trico Energy Corporation | | Oil Operator | May 1984 |
| 242 | Tristar Energy 1 | | Oil Operator | Sep 1987 |
| 243 | Triumph Energy Inc | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 |
| 244 | Troy E. Boyd | | Oil Operator | Oct 1998 |
| 245 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 246 | U.S. Capital Corp Of Am, Inc. | | Oil & Gas Operator | Aug 1998 |
| 247 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 248 | Universal Land | | Oil Operator | Dec 2024 |
| 249 | V. H. Brumley | | Oil Operator | Jul 1994 |
| 250 | Vine Energy Operating LP | | Gas Operator | Oct 2021 |
| 251 | Vine Oil & Gas LP | | Gas Operator | Apr 2021 |
| 252 | W D L Enterprises, Inc | | Oil & Gas Operator | Apr 1983 |
| 253 | Warwick Oil & Gas, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 1993 |
| 254 | Wedco Resources Corporation | | Oil & Gas Operator | Jul 1989 |
| 255 | Westek Resources, Inc. | | Oil & Gas Operator | Jan 2004 |
| 256 | Western Exploration, Inc. | | Oil Operator | May 1984 |
| 257 | Western Resources, Inc. | | Oil Operator | Jun 1994 |
| 258 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 259 | Wicker Oil Co | | Oil & Gas Operator | Feb 1992 |
| 260 | William M. Williams | | Oil Operator | May 2018 |
| 261 | Wilson Production Co Of La,Inc | | Oil & Gas Operator | Apr 1991 |
| 262 | Wilson Well Service | Loco, OK 73442-0114 | Oil & Gas Operator | Mar 2018 |
| 263 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 264 | Wolfe Oil | Bremen, OH 43107 | Oil Operator | Dec 2025 |
| 265 | Womack Prod Co. | | Oil Operator | Feb 1996 |
| 266 | Woolf & Magee, Inc. | | Oil & Gas Operator | Oct 1991 |
| 267 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |