| 301 | Ramsey & Gassaway | Borger, TX 79008 | Gas Operator | Jun 1999 |
| 302 | Ramsey Associated Petroleum, Inc. | Glenville, WV 26351-0090 | Oil & Gas Operator | Dec 2021 |
| 303 | Ramsey Engineering Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 1993 |
| 304 | Ramsey George H Estate | Ardmore, OK 73401-3644 | Oil & Gas Operator | Nov 2013 |
| 305 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | May 2025 |
| 306 | Ramsey Production Company, LLC | Austin, TX 78766 | Oil & Gas Operator | Jan 2017 |
| 307 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Apr 2025 |
| 308 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 309 | Ramsey, Sid | Arlington, TX 76010 | Oil & Gas Operator | Aug 2012 |
| 310 | Ramshorn Resources, LLC | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 311 | Ramsower Minerals Corporation | Beeville, TX 78104 | Oil & Gas Operator | Sep 2013 |
| 312 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2025 |
| 313 | Ran Resources, Inc. | Beverly, WV 26253 | Gas Operator | Dec 2021 |
| 314 | Rana Energy Company | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 315 | Ranch Creek Exploration LLC | Tulsa, OK 74105 | Oil & Gas Operator | Mar 2025 |
| 316 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Jun 2025 |
| 317 | Ranch Production Co | | Oil & Gas Operator | Jul 2000 |
| 318 | Ranch Production LLC | | Oil & Gas Operator | Jan 2025 |
| 319 | Ranch VIew Resources LLC | Houston, TX 77007 | Gas Operator | Aug 2016 |
| 320 | Ranchers Exploration Partners LLC | | Oil & Gas Operator | Jan 2015 |
| 321 | Rancho Blanco Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1995 |
| 322 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2025 |
| 323 | Rand - Paulson Oil Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Feb 1999 |
| 324 | Rand Energy Company | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 325 | Rand Oil & Gas Corp. | Houston, TX 77040 | Oil & Gas Operator | Jul 2025 |
| 326 | Rand Oil & Gas Inc. | Midland, TX BAD ADDR | Oil & Gas Operator | Apr 1996 |
| 327 | Rand Paulson Energy Company | Houston, TX 77040 | Oil & Gas Operator | Oct 1999 |
| 328 | Randa Operating, Inc. | Big Lake, TX 76932 | Oil Operator | Jul 2025 |
| 329 | Randall E James Oil Company | Guthrie, OK 73044-9352 | Oil & Gas Operator | Apr 2025 |
| 330 | Randall Exploration, LLC | Tulsa, OK 74136 | Oil Operator | Jul 2025 |
| 331 | Randall Florence | Albion, PA 16401-9768 | Gas Operator | Dec 2010 |
| 332 | Randell Oil Co | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 333 | Randolph Company, The | Houston, TX 77219 | Oil & Gas Operator | Aug 2003 |
| 334 | Randon Production Co. | Marion, KS 66861 | Oil & Gas Operator | Sep 2024 |
| 335 | Randy And Jan Walker Oil Company LLC | Konawa, OK 74849-9333 | Oil & Gas Operator | May 2025 |
| 336 | Randy Inc | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 337 | Randy J Walker Oil Company | | Oil Operator | Dec 2024 |
| 338 | Randy J. & Deborah R. Allison | | Oil & Gas Operator | Dec 2003 |
| 339 | Randy Wilson | | Oil Operator | Dec 2020 |
| 340 | Raney Oil Company | Lawrence, KS 66047 | Oil & Gas Operator | May 1999 |
| 341 | Raney Oil Company, LLC | Lawrence, KS 66049 | Oil & Gas Operator | Mar 2025 |
| 342 | Range Louisiana Operating, LLC | | Oil & Gas Operator | Aug 2020 |
| 343 | Range Michigan LLC | | Oil Operator | Dec 2020 |
| 344 | Range Oil Co., Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jan 2020 |
| 345 | Range Oil Compan | | Oil & Gas Operator | Nov 1995 |
| 346 | Range Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2000 |
| 347 | Range Operating New Mexico Inc | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2004 |
| 348 | Range Operating New Mexico LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2013 |
| 349 | Range Opr Co | Yatesboro, PA 16263-0235 | Oil & Gas Operator | Dec 1999 |
| 350 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 351 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 352 | Range Resources - Pine Mountain, Inc. | | Oil & Gas Operator | Jan 2011 |
| 353 | Range Resources Appalachia LLC | Canonsburg, PA 15317 | Oil & Gas Operator | May 2025 |
| 354 | Rangeland Exploration Company | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 355 | Rangeland Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2002 |
| 356 | Ranger 40 Petroleum, LLC | Fairfield, CT 06824 | Oil & Gas Operator | Jul 2025 |
| 357 | Ranger Drilling LLC | Chicago, IL 60605-1041 | Oil & Gas Operator | Feb 2004 |
| 358 | Ranger Holdings Co | | Oil & Gas Operator | Jul 1993 |
| 359 | Ranger Investments, Inc. | Longview, TX 75605 | Oil & Gas Operator | Oct 2006 |
| 360 | Ranger O & G Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 361 | Ranger Oil & Gas, Inc. | Okay, OK 74446 | Oil Operator | Jan 2007 |
| 362 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 363 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 364 | Ranger Systems Inc | Tulsa, OK 74145 | Oil Operator | Feb 2020 |
| 365 | Ranger, Inc. | | Oil & Gas Operator | Dec 1986 |
| 366 | Rangeview Resources Operating Co | | Oil & Gas Operator | May 2025 |
| 367 | Ranjan, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 368 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Apr 2025 |
| 369 | Rankin, Lennes | Sharon, KS 67138 | Gas Operator | Mar 2025 |
| 370 | Rankin, Paul | Bridgeville, PA 15017 | Oil & Gas Operator | Jun 2016 |
| 371 | Rannic Inc. | Baytown, TX 77521 | Oil Operator | Jul 2025 |
| 372 | Rannuff Oil & Gas Co | Waynesburg, PA 15370-1437 | Oil & Gas Operator | Dec 2024 |
| 373 | Ranphil, LLC | Hiltn Head Is, SC 29928 | Oil & Gas Operator | Feb 2016 |
| 374 | Ransom Horne,Jr. | | Oil & Gas Operator | Dec 1991 |
| 375 | Raol Company, The | Natalia, TX 78059 | Oil & Gas Operator | Jul 2025 |
| 376 | Rap Operating, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Jul 2025 |
| 377 | Raper Brice Oil Company LLC | Yale, OK 74085-6865 | Oil & Gas Operator | Apr 2015 |
| 378 | Rapid Well Servi | | Oil Operator | Feb 1995 |
| 379 | Rapid Well Service, Inc. | Russell, KS 67665 | Oil Operator | Mar 2025 |
| 380 | Rapiere Resources Company | | Oil & Gas Operator | Aug 2024 |
| 381 | Rapp Oil & Gas | Oklahoma City, OK 73120 | Gas Operator | Jul 2020 |
| 382 | Rapp, Brian R. And Judith E. | Cassadaga, NY 14718 | Gas Operator | Dec 2024 |
| 383 | Rapp, Kenneth E. | Sugar Grove, PA 16350 | Gas Operator | Dec 2024 |
| 384 | Raptor Petroleum Develop, LLC | Edmond, OK 73034 | Oil & Gas Operator | Jul 2025 |
| 385 | Raptor Petroleum II, LLC | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 386 | Raptor Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Jul 2025 |
| 387 | Rar Properties LLC | Duncan, OK 73533 | Oil Operator | Apr 2025 |
| 388 | Rare Earth Minerals, Inc. | | Oil & Gas Operator | Dec 2014 |
| 389 | Rare Petro Exploration LLC | | Oil & Gas Operator | May 2025 |
| 390 | Rasbury | Clyde, TX 79510 | Oil Operator | Jul 2025 |
| 391 | Rash, Terry | Corsicana, TX 75109 | Oil & Gas Operator | Jul 2025 |
| 392 | Rasmussen'S Energy, Inc. | Waterloo, NY 13165 | Gas Operator | Dec 2024 |
| 393 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 394 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Jul 2025 |
| 395 | Rass Operating | Amarillo, TX 79124 | Oil & Gas Operator | Jul 2008 |
| 396 | Ratex Corporation | Cambridge, WI 53523 | Oil Operator | Jun 2011 |
| 397 | Ratex Energy Inc. | Manchaca, TX 78652 | Oil & Gas Operator | Sep 2002 |
| 398 | Ratex Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2000 |
| 399 | Rathbun Roger | | Oil & Gas Operator | Dec 1993 |
| 400 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |