| 301 | Revard Petroleum, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 302 | Reveille Resources | Houston, TX 77084 | Oil & Gas Operator | Apr 2011 |
| 303 | Reveille Resources (Texas), Inc. | Houston, TX 77084 | Oil & Gas Operator | Jan 2013 |
| 304 | Revelation Oil & Gas LLC | Dumas, TX 79029 | Oil & Gas Operator | Apr 2024 |
| 305 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Apr 2024 |
| 306 | Revier Resources Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2005 |
| 307 | Revier, J. B. Prod. Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Apr 1996 |
| 308 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 309 | Revolution Operating Company,LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2024 |
| 310 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 311 | Rex Oil, A Texas Partnership | Hondo, TX 78861 | Oil & Gas Operator | May 2003 |
| 312 | Rexcom, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2024 |
| 313 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2024 |
| 314 | Reynolds E & P, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2024 |
| 315 | Reynolds, E. P., Jr. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 316 | Reynolds, J. C. & W. F. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 317 | Reynolds, Richard | Seymour, TX 76380 | Oil & Gas Operator | Mar 2008 |
| 318 | Rfe Operating, LLC | Tyler, TX 75703 | Oil & Gas Operator | Apr 2024 |
| 319 | RGX Energy LLC | Plano, TX 75025 | Oil & Gas Operator | Oct 2019 |
| 320 | RHB Exploration & Production,LLC | Grapevine, TX 76099 | Oil & Gas Operator | Apr 2024 |
| 321 | RHC Energy (USA) LLC | Houston, TX 77027 | Oil Operator | Apr 2024 |
| 322 | Rheaco Oil Company, LTD. | Sourlake, TX 77659 | Oil Operator | Apr 2024 |
| 323 | Rheata Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 324 | Rhodes Disposal, Inc. | Bryson, TX 76427 | Oil Operator | Apr 2024 |
| 325 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 326 | Rhombus Operating Co., LTD | Littleton, CO 80160 | Oil & Gas Operator | Apr 2024 |
| 327 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 328 | RHR Oil & Gas, LLC | Fort Worth, TX 76107 | Oil Operator | Apr 2024 |
| 329 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 330 | Ria Mia Corporation | San Antonio, TX 78230 | Oil & Gas Operator | Apr 2011 |
| 331 | Rialto Oil & Gas Corporation | Houston, TX 77098 | Oil & Gas Operator | Oct 2012 |
| 332 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 333 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 334 | Rice Drilling Company | Santa Anna, TX 76878 | Oil & Gas Operator | Apr 2024 |
| 335 | Rice, James D. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2007 |
| 336 | Richard C. Bellows Family Trust | George West, TX 78022 | Oil Operator | Apr 2024 |
| 337 | Richard'S Texas Tea | Rockdale, TX 76567 | Oil Operator | Apr 2024 |
| 338 | Richards' Operating Company | Amarillo, TX 79120 | Oil & Gas Operator | Aug 2003 |
| 339 | Richards, Michael Dewain | Graham, TX 76450 | Oil & Gas Operator | Apr 2011 |
| 340 | Richards, Tot Dozer, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | May 2013 |
| 341 | Richards, Tot Oil Co. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 342 | Richardson Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 343 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jan 2024 |
| 344 | Richardson Resources Inc | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2024 |
| 345 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 346 | Richardson, Marshall T. | Midfield, TX 77458 | Oil & Gas Operator | Apr 2024 |
| 347 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 348 | Richey Properties, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 349 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 350 | Richland Energy, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 351 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2024 |
| 352 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 353 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 354 | Richmond Operating Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2007 |
| 355 | Richmond Petroleum Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Aug 2003 |
| 356 | Richter Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2007 |
| 357 | Rickaway Energy, Corp. | Pleasanton, TX 78064 | Oil & Gas Operator | Apr 2024 |
| 358 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 359 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 360 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 361 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 362 | Rico Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 363 | Ricochet Energy, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2024 |
| 364 | Ricon Petroleum Company | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 365 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 366 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 367 | Ridge Petroleum Inc. | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 368 | Ridgeline Energy Inc. | Miami, FL 33130 | Oil & Gas Operator | Apr 2024 |
| 369 | Ridgeline Resources, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 370 | Ridgemar Energy Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 371 | Ridgeway Exco, Inc. | San Antonio, TX 78279 | Oil & Gas Operator | Mar 1996 |
| 372 | Ridglea Energy I, LLC | Spring, TX 77379 | Oil & Gas Operator | Apr 2024 |
| 373 | Ridley Oil Corporation | Tyler, TX 75702 | Oil & Gas Operator | Nov 1996 |
| 374 | Rife Energy Operating, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2024 |
| 375 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 376 | Rife Operating, LTD. | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2005 |
| 377 | Rife, M. O., Jr. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 1998 |
| 378 | Rig Petroleum, LLC | Spearman, TX 79081 | Oil & Gas Operator | Apr 2024 |
| 379 | Rig Runner Express Inc Of Texas | Kilgore, TX 75663 | Oil & Gas Operator | May 2014 |
| 380 | Rig Runner Express, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Mar 2008 |
| 381 | Riggins Energy Inc. | Vernon, TX 76385 | Oil & Gas Operator | Jul 2004 |
| 382 | Riggs Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 383 | Riggs, Don R. | San Antonio, TX 78270 | Oil & Gas Operator | Aug 2003 |
| 384 | Riley Exploration Opg Co, LLC | La Grange, TX 78945 | Oil & Gas Operator | Apr 2024 |
| 385 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Apr 2024 |
| 386 | Riley Permian Operating Co, LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2024 |
| 387 | Riley Production | Throckmorton, TX 76483 | Oil & Gas Operator | Apr 2024 |
| 388 | Riley Production, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2012 |
| 389 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2024 |
| 390 | Rimfire Resources, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 391 | Rimrock Energy, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2012 |
| 392 | Rimrock Gas Company | Weatherford, OK 73096 | Oil & Gas Operator | May 2008 |
| 393 | Rimrock Production Inc. | Giddings, TX 78942 | Oil & Gas Operator | Apr 2024 |
| 394 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 395 | Rincon Production Co., Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 1997 |
| 396 | Ring Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 397 | Ringo Rig LLC | Coleman, TX 76834 | Oil & Gas Operator | Apr 2024 |
| 398 | Rio Blanco Energy, Inc. | Littleton, CO 80121 | Oil & Gas Operator | Oct 2002 |
| 399 | Rio Bravo Expl. & Prod. Co. | Houston, TX 77055 | Oil & Gas Operator | Apr 2020 |
| 400 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |