| 201 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 202 | Titan Oil & Gas Corporation | Edmond, OK 73013-5417 | Oil & Gas Operator | Dec 2023 |
| 203 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Mar 2024 |
| 204 | TJ Oil Company | Borger, TX 79008 | Oil & Gas Operator | Apr 2024 |
| 205 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Jan 2024 |
| 206 | TKL Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Dec 2023 |
| 207 | TLC Oil And Gas | Duncan, OK 73533-9477 | Oil & Gas Operator | Oct 2015 |
| 208 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Jan 2024 |
| 209 | TLS Operating Company | Greenwood VIlge, CO 80111 | Oil & Gas Operator | Dec 2013 |
| 210 | TNT Energy Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 2013 |
| 211 | TNT Enterprizes | Coweta, OK 74429 | Oil & Gas Operator | Nov 2005 |
| 212 | TNT Operating Company Inc | Blanchard, OK 73010 | Oil & Gas Operator | Feb 2024 |
| 213 | Toco Oil & Gas Co | Grapevine, TX 76051 | Oil & Gas Operator | Feb 1993 |
| 214 | Todd John C | Oklahoma City, OK 73112-8049 | Oil & Gas Operator | May 2015 |
| 215 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 216 | Toklan Oil Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 217 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Apr 2024 |
| 218 | Toland & Johnston Inc | Edmond, OK 73083-0189 | Oil & Gas Operator | Feb 2024 |
| 219 | Tolson Gary | Seminole, OK 74868-3267 | Oil & Gas Operator | Jan 2024 |
| 220 | Toma Explorations LLC | | Oil & Gas Operator | Jan 2024 |
| 221 | Tomar Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2001 |
| 222 | Tomlinson Oil Co. Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Jun 2023 |
| 223 | Tomlinson W E | Comanche, OK 73529-9561 | Oil Operator | Aug 1996 |
| 224 | Tomorrows Energy Exploration Inc | Dallas, TX 75382-0847 | Oil & Gas Operator | Jan 2024 |
| 225 | Tonkawa Saltwater Disposal LLC | | Oil Operator | Dec 2015 |
| 226 | Tonner Petroleum LLC | Dallas, TX 75248-3326 | Oil Operator | Feb 2011 |
| 227 | Tony Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 228 | Tony'S Disposal Service Inc | Yale, OK 74085-0335 | Oil Operator | Aug 1997 |
| 229 | Tonys Crude Oil Reclaiming Plant Inc | | Oil Operator | Jan 2024 |
| 230 | Toomey Oil Company Inc | Tulsa, OK 74101-1090 | Oil & Gas Operator | Feb 2024 |
| 231 | Topco Inc | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2005 |
| 232 | Topsail Secondary Recovery LLC | | Oil & Gas Operator | Feb 2024 |
| 233 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 234 | Tornado Energy Corporation | Sugarland, TX 77479-7124 | Oil & Gas Operator | Nov 2014 |
| 235 | Totah Production | Duncan, OK 73533-9406 | Oil Operator | Mar 2015 |
| 236 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 237 | Total Petroleum Inc | Denver, CO 80201-0500 | Oil & Gas Operator | Nov 2006 |
| 238 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 239 | Tower Energy Corporation | Sapulpa, OK 74067-0837 | Oil & Gas Operator | Mar 2015 |
| 240 | Tower Oil & Gas Company, Inc. | Englewood, CO 80111 | Oil & Gas Operator | May 2001 |
| 241 | Tower Wanda L Nations | Oklahoma City, OK 73123 | Oil & Gas Operator | Aug 1996 |
| 242 | Townsend Operating Company | | Oil & Gas Operator | Jan 2008 |
| 243 | Townsend V E | Ada, OK 74820 | Oil & Gas Operator | May 2013 |
| 244 | Tpet, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 245 | Trace Oil & Gas LP | Cement, OK 73017-0563 | Oil & Gas Operator | Feb 2024 |
| 246 | Trace Operating Co & R Hudson | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2013 |
| 247 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 248 | Trachtenberg Daniel S | Houston, TX 77071-2608 | Oil Operator | Jan 2024 |
| 249 | Trackstar Energies LLC | Colorado Springs, CO 80919 | Oil Operator | Mar 2023 |
| 250 | Tracy & Associates Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 251 | Trafalgar House Oil & Gas Inc. | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 252 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Feb 2024 |
| 253 | Trailblazer Energy LLC | Plano, TX 75075 | Oil & Gas Operator | Feb 2024 |
| 254 | Trailhead Exploration LLC | | Oil & Gas Operator | Feb 2024 |
| 255 | Trans Atlantic Resource Corp | Tulsa, OK 74136-5709 | Oil & Gas Operator | Nov 1998 |
| 256 | Trans Oil Marketing LLC | Abilene, TX 79602 | Oil Operator | Aug 2023 |
| 257 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Feb 2024 |
| 258 | Trans-Western Expl. Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 259 | Transcoastal Operating LLC | Dallas, TX 75252-5646 | Oil & Gas Operator | Mar 2015 |
| 260 | Transcontinental Company | Fort Worth, TX 76161-1804 | Oil & Gas Operator | Feb 2024 |
| 261 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 262 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | Apr 2024 |
| 263 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 264 | Travco Well Servicing LLC | | Oil Operator | Jan 2024 |
| 265 | Travis Peak Resources LLC | Austin, TX 78759-7279 | Oil & Gas Operator | Jan 2024 |
| 266 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 267 | Treat Howard | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2014 |
| 268 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Apr 2024 |
| 269 | Trenchco Inc | Shawnee, OK 74802-3577 | Oil & Gas Operator | Apr 2015 |
| 270 | Trend Gas & Oil Inc | Jenks, OK 74037 | Oil & Gas Operator | Dec 2000 |
| 271 | Trenon Oil & Gas Inc | Oklahoma City, OK 73112-4279 | Oil & Gas Operator | Sep 1996 |
| 272 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jan 2024 |
| 273 | Trepel Petroleum Exploration & | | Oil & Gas Operator | Apr 2014 |
| 274 | Tresco Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 275 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Jan 2024 |
| 276 | Tri Production Inc | Healdton, OK 73438-0177 | Oil & Gas Operator | Jan 2024 |
| 277 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 278 | Tri-City Energy Inc | | Oil Operator | Mar 2014 |
| 279 | Tri-Ex Petroleum, L.P. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2013 |
| 280 | Tri-State Pipeline Service Inc | Ninnekah, OK 73067-0189 | Oil & Gas Operator | Mar 2011 |
| 281 | Tri-Unity Inc | Sand Springs, OK 74063-4401 | Oil & Gas Operator | Jun 2009 |
| 282 | Triad Energy Corp. Of Texas | Houston, TX 77057-2696 | Oil & Gas Operator | Sep 2014 |
| 283 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Feb 2024 |
| 284 | Triad Of Oklahoma Inc | | Oil & Gas Operator | Feb 1996 |
| 285 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 286 | Triangle Interprises Inc | Justin, TX 76247-0598 | Oil & Gas Operator | Jun 2015 |
| 287 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 288 | Tridon Oil Inc | Lafayette, LA 70505-2305 | Gas Operator | Dec 2013 |
| 289 | Triexco Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2012 |
| 290 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 291 | Trigger'S Disposal LLC | Sayre, OK 73662-2913 | Oil Operator | Sep 2022 |
| 292 | Trilliant Energy Texas LTD | | Oil & Gas Operator | Jun 2020 |
| 293 | Trineha Inc | Ardmore, OK 73402-2478 | Oil & Gas Operator | Jun 2009 |
| 294 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Apr 2024 |
| 295 | Trinity Oil & Gas Producers LLC | | Oil & Gas Operator | Jan 2024 |
| 296 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 297 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 298 | Trio Consulting & MGMT LLC | Wichita Falls, TX 76307-0209 | Oil Operator | Feb 2024 |
| 299 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 300 | Triple "S" Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Apr 2024 |