| 201 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 202 | Titan Oil & Gas Corporation | Edmond, OK 73013-5417 | Oil & Gas Operator | Nov 2025 |
| 203 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Jan 2026 |
| 204 | TJ Oil Company | Borger, TX 79008 | Oil & Gas Operator | Mar 2026 |
| 205 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2025 |
| 206 | TKL Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Oct 2025 |
| 207 | TLC Oil And Gas | Duncan, OK 73533-9477 | Oil & Gas Operator | Oct 2015 |
| 208 | TLM Resources Inc | Enid, OK 73706-0641 | Gas Operator | Mar 2015 |
| 209 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Dec 2025 |
| 210 | TLS Operating Company | Greenwood VIlge, CO 80111 | Oil & Gas Operator | Dec 2013 |
| 211 | TNT Energy Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 2013 |
| 212 | TNT Enterprizes | Coweta, OK 74429 | Oil & Gas Operator | Nov 2005 |
| 213 | TNT Operating Company Inc | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2025 |
| 214 | Toco Oil & Gas Co | Grapevine, TX 76051 | Oil & Gas Operator | Feb 1993 |
| 215 | Todd John C | Oklahoma City, OK 73112-8049 | Oil & Gas Operator | May 2015 |
| 216 | Token Operating, LLC | Enid, OK 73703-1094 | Oil & Gas Operator | Jan 2026 |
| 217 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 218 | Toklan Oil Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 219 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Mar 2026 |
| 220 | Toland & Johnston Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2026 |
| 221 | Tolson Gary | Seminole, OK 74868-3267 | Oil & Gas Operator | Nov 2025 |
| 222 | Toma Explorations LLC | Shawnee, OK 74801-6925 | Oil & Gas Operator | Feb 2025 |
| 223 | Tomar Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2001 |
| 224 | Tomlinson Interest | | Oil & Gas Operator | Jun 2013 |
| 225 | Tomlinson Oil Co Inc | Great Bend, KS 67530 | Oil & Gas Operator | May 2025 |
| 226 | Tomlinson W E | Comanche, OK 73529-9561 | Oil Operator | Aug 1996 |
| 227 | Tomorrows Energy Exploration Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Dec 2025 |
| 228 | Tonkawa Saltwater Disposal LLC | Woodward, OK 73801 | Oil Operator | Dec 2015 |
| 229 | Tonner Petroleum LLC | Dallas, TX 75248-3326 | Oil Operator | Feb 2011 |
| 230 | Tony Oil Company | | Oil & Gas Operator | Dec 2025 |
| 231 | Tony'S Disposal Service Inc | Yale, OK 74085 | Oil Operator | Aug 1997 |
| 232 | Tonys Crude Oil Reclaiming Plant Inc | | Oil Operator | Dec 2025 |
| 233 | Toomey Oil Company Inc | Tulsa, OK 74120 | Oil & Gas Operator | Dec 2025 |
| 234 | Topco Inc | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2005 |
| 235 | Topsail Secondary Recovery LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 236 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 237 | Tornado Energy Corporation | Sugarland, TX 77479-7124 | Oil & Gas Operator | Nov 2014 |
| 238 | Totah Production | Duncan, OK 73533-9406 | Oil Operator | Mar 2015 |
| 239 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 240 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 241 | Tower Energy Corporation | Sapulpa, OK 74067-0837 | Oil & Gas Operator | Mar 2015 |
| 242 | Tower Oil & Gas Company Inc | Englewood, CO 80111 | Oil & Gas Operator | May 2001 |
| 243 | Tower Wanda L Nations | Oklahoma City, OK 73123 | Oil & Gas Operator | Aug 1996 |
| 244 | Townsend Operating Company | | Oil & Gas Operator | Jan 2008 |
| 245 | Townsend V E | Ada, OK 74820 | Oil & Gas Operator | May 2013 |
| 246 | Tpet, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 247 | Trace Oil & Gas LP | Cement, OK 73017 | Oil & Gas Operator | Dec 2025 |
| 248 | Trace Operating Co & R Hudson | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2013 |
| 249 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 250 | Trachtenberg Daniel S | Houston, TX 77071 | Oil Operator | Dec 2025 |
| 251 | Trackstar Energies LLC | Colorado Springs, CO 80919-3233 | Oil Operator | Mar 2023 |
| 252 | Tracy & Associates Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 253 | Trafalgar House Oil & Gas Inc | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 254 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jan 2026 |
| 255 | Trailblazer Energy LLC | Plano, TX 75075 | Oil & Gas Operator | Jan 2026 |
| 256 | Trailhead Exploration, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2026 |
| 257 | Trans Atlantic Resource Corp | Tulsa, OK 74136-5709 | Oil & Gas Operator | Nov 1998 |
| 258 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2026 |
| 259 | Trans Terra Corp Int'L | Amarillo, TX 79159-0370 | Oil & Gas Operator | Jul 1993 |
| 260 | Trans-Western Exploration Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 261 | Transamerican Energy LTD | Dallas, TX 75231-1075 | Oil & Gas Operator | Apr 2014 |
| 262 | Transcoastal Operating LLC | Dallas, TX 75252-5646 | Oil & Gas Operator | Mar 2015 |
| 263 | Transcontinental Company | Haltom City, TX 76148-4122 | Oil & Gas Operator | Dec 2025 |
| 264 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 265 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | Mar 2026 |
| 266 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 267 | Transpetco Transport Company | Shreveport, LA 71101-5370 | Oil Operator | Jun 2008 |
| 268 | Travco Well Servicing LLC | Okmulgee, OK 74447 | Oil Operator | Dec 2025 |
| 269 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 270 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 271 | Treat Howard | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2014 |
| 272 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Mar 2026 |
| 273 | Trenchco Inc | Shawnee, OK 74802-3577 | Oil & Gas Operator | Apr 2015 |
| 274 | Trend Gas & Oil Inc | Jenks, OK 74037 | Oil & Gas Operator | Dec 2000 |
| 275 | Trenon Oil & Gas Inc | Oklahoma City, OK 73112-4279 | Oil & Gas Operator | Sep 1996 |
| 276 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Dec 2025 |
| 277 | Trepel Petroleum Exploration & | | Oil & Gas Operator | Apr 2014 |
| 278 | Tresco Energy LLC | Enid, OK 73703-3002 | Oil & Gas Operator | Dec 2025 |
| 279 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 280 | Tri Production Inc | Healdton, OK 73438 | Oil & Gas Operator | Dec 2025 |
| 281 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2026 |
| 282 | Tri-City Energy Inc | Wilson, OK 73463-0196 | Oil Operator | Mar 2014 |
| 283 | Tri-Ex Petroleum, L.P. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2013 |
| 284 | Tri-State Pipeline Service Inc | Ninnekah, OK 73067-0189 | Oil & Gas Operator | Mar 2011 |
| 285 | Tri-Unity Inc | Sand Springs, OK 74063-4401 | Oil & Gas Operator | Jun 2009 |
| 286 | Triad Energy Corp Of Texas | Houston, TX 77057-2696 | Oil & Gas Operator | Sep 2014 |
| 287 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Jan 2026 |
| 288 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 289 | Triangle Interprises Inc | Justin, TX 76247-0598 | Oil & Gas Operator | Jun 2015 |
| 290 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2024 |
| 291 | Tridon Oil Inc | Lafayette, LA 70505-2305 | Gas Operator | Dec 2013 |
| 292 | Triexco Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2012 |
| 293 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 294 | Trigger'S Disposal LLC | Sayre, OK 73662-2913 | Oil Operator | Sep 2022 |
| 295 | Trilliant Energy Texas LTD | Tulsa, OK 74135-0767 | Oil & Gas Operator | Jun 2020 |
| 296 | Trilogy Natural Resources LLC | Edmond, OK 73025 | Oil & Gas Operator | Dec 2025 |
| 297 | Trineha Inc | Ardmore, OK 73402-2478 | Oil & Gas Operator | Jun 2009 |
| 298 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Mar 2026 |
| 299 | Trinity Oil & Gas Inc | Pauls Valley, OK 73075 | Oil Operator | Dec 2025 |
| 300 | Trinity Oil & Gas Producers LLC | Allen, OK 74825 | Oil & Gas Operator | Jan 2026 |