| 201 | Red Rock Resources, L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | May 2025 |
| 202 | Red Sand Resources LLC | Ada, OK 74821 | Oil Operator | May 2025 |
| 203 | Red Shell Inc | Dale, TX 78616 | Oil & Gas Operator | Sep 2025 |
| 204 | Red Stag Energy, LLC | Ozona, TX 76943 | Oil & Gas Operator | Jan 2022 |
| 205 | Red Stag Operating, LLC | Ozona, TX 76943 | Oil & Gas Operator | Sep 2025 |
| 206 | Red Stone Resources LLC | Edmond, OK 73013 | Oil Operator | Jun 2023 |
| 207 | Red Tail Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 208 | Red Tank Resources, LLC | Dallas, TX 75379 | Oil & Gas Operator | Sep 2025 |
| 209 | Red Water Resources, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2025 |
| 210 | Red Willow Mid-Continent, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2009 |
| 211 | Red Willow Production, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2015 |
| 212 | Red Wolf Oil Company, Inc. | Brenham, TX 77833 | Oil & Gas Operator | Sep 2025 |
| 213 | Red-Tex Energy Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2000 |
| 214 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 215 | Redbird Oilfield Services Corp. | Splendora, TX 77372 | Oil & Gas Operator | Sep 2025 |
| 216 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Sep 2025 |
| 217 | Redco Oil & Gas, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Sep 2025 |
| 218 | Redding, Bobby L. | Three Rivers, TX 78071 | Oil & Gas Operator | Mar 2004 |
| 219 | Reddirt Operating, LLC. | Midland, TX 79704 | Oil & Gas Operator | Sep 2025 |
| 220 | Reddy Disposals, LLC | Beeville, TX 78104 | Oil Operator | Sep 2025 |
| 221 | Redemption Oil & Gas, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2024 |
| 222 | Redfish Bay Operating Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1998 |
| 223 | Redhorn Resources, LLC | Spring, TX 77393 | Oil Operator | Sep 2025 |
| 224 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 225 | Redman Operating Company LLC | Nocona, TX 76255 | Oil Operator | Sep 2025 |
| 226 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | Sep 2025 |
| 227 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 228 | Redstone Operating, Inc. | Austin, TX 78734 | Oil & Gas Operator | Jan 2015 |
| 229 | Redwine Oil Company | Throckmorton, TX 76483 | Oil & Gas Operator | Jul 2009 |
| 230 | Redwine Resources Inc | Dallas, TX 75225 | Oil & Gas Operator | Feb 2015 |
| 231 | Redwood Energy Production, L.P. | San Francisco, CA 94104 | Gas Operator | Sep 2025 |
| 232 | Redwood Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 233 | Redwood Oil & Gas | McKinney, TX 75070 | Oil & Gas Operator | Apr 2013 |
| 234 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Sep 2025 |
| 235 | Reed Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 236 | Reed Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jun 2005 |
| 237 | Reed Production, Inc. | Gainesville, TX 76241 | Oil Operator | Sep 2025 |
| 238 | Reed, Robert T. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2025 |
| 239 | Reed, Trace | Bridgeport, TX 76426 | Oil & Gas Operator | Sep 2025 |
| 240 | Reeder, Wendell A. | Kilgore, TX 75663 | Oil Operator | Jul 2013 |
| 241 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 242 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2025 |
| 243 | Reese Wellsite Supervision, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 244 | Reeves County Systems, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Aug 2019 |
| 245 | Refined Products, Inc. | Beaumont, TX 77705 | Oil Operator | Sep 2025 |
| 246 | Reflection Energy Search, Inc | Midland, TX 79702 | Oil Operator | Feb 2006 |
| 247 | Refuge Properties, LLC | Longview, TX 75608 | Oil Operator | Mar 2025 |
| 248 | Regal Development Inc. | Eldorado, TX 76936 | Gas Operator | Jul 1996 |
| 249 | Regal Energy Corporation | Rhome, TX 76078 | Oil & Gas Operator | Sep 2025 |
| 250 | Regal Energy Operating, L.L.C. | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 251 | Regal Operating | Cisco, TX 76437 | Oil & Gas Operator | Mar 2008 |
| 252 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 253 | Regency Energy, Inc. | Crystal City, TX 78839 | Oil & Gas Operator | Sep 2025 |
| 254 | Regency Petroleum Co. | Irving, TX 75016 | Oil & Gas Operator | Aug 2002 |
| 255 | Regency Petroleum Co. Of New Mex | Coppell, TX 75019 | Oil & Gas Operator | Apr 2008 |
| 256 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 257 | Regions Energy LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2016 |
| 258 | Regions Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 259 | Rego Development Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2002 |
| 260 | Reh Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Sep 2025 |
| 261 | Reh Oil And Gas, LLC. | Pratt, KS 67124 | Oil & Gas Operator | Apr 2019 |
| 262 | Rehoboth Oil & Gas LLC | Baytown, TX 77521 | Oil Operator | Oct 2011 |
| 263 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Sep 2025 |
| 264 | Reilly, K. L. | Huntsville, TX 77342 | Oil Operator | Dec 2004 |
| 265 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Sep 2025 |
| 266 | Reinecke Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2018 |
| 267 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 268 | Reliance Oil And Gas, Inc. | Austin, TX 78748 | Oil Operator | Jun 2012 |
| 269 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 270 | Reliance Trusts | Dallas, TX 75244 | Oil & Gas Operator | Nov 1995 |
| 271 | Reliant Exploration, LTD. | Houston, TX 77060 | Oil & Gas Operator | Sep 2002 |
| 272 | Remarkable Operating Co. | Pampa, TX 79065 | Gas Operator | Jul 2019 |
| 273 | Remco Oil & Gas Production,Inc. | Rio Grande Ci, TX 78582 | Oil & Gas Operator | Nov 2021 |
| 274 | Remington Oil | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 275 | Remnant Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2025 |
| 276 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 277 | Remo, Inc. | Odessa, TX 79760 | Oil & Gas Operator | May 2003 |
| 278 | Remora Management, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Sep 2025 |
| 279 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 280 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Sep 2025 |
| 281 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 282 | Renaud Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 283 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 284 | Reneau Oil Co. | Shamrock, TX 79079 | Oil & Gas Operator | Sep 2025 |
| 285 | Reneau, James R. | Shamrock, TX 79079 | Gas Operator | Oct 2001 |
| 286 | Reneau, James Seed Co. | Shamrock, TX 79079 | Oil & Gas Operator | Sep 2025 |
| 287 | Reneau, Nelda York | Snyder, TX 79549 | Oil & Gas Operator | Sep 2025 |
| 288 | Renegade Operating Company | Aurora, CO 80016 | Oil & Gas Operator | Aug 2023 |
| 289 | Renegade Operating Company, LLC | Abilene, TX 79608 | Oil Operator | Oct 2006 |
| 290 | Renuergy LLC | Houston, TX 77024 | Oil & Gas Operator | Jan 2024 |
| 291 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Sep 2025 |
| 292 | Reostar Operating Incorporated | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2012 |
| 293 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2025 |
| 294 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 295 | Republic Energy Operating, LLC | Decatur, TX 76234 | Oil & Gas Operator | Jan 2016 |
| 296 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Sep 2025 |
| 297 | Resaca Operating Company | Houston, TX 77010 | Oil & Gas Operator | Sep 2013 |
| 298 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Sep 2025 |
| 299 | Research Exploration, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2018 |
| 300 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |