| 301 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 302 | Robinson Brothers Drilling Co | | Oil & Gas Operator | Jul 2002 |
| 303 | Robinson Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Jul 2026 |
| 304 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 305 | Robinson Tracy D | Duncan, OK 73534 | Oil Operator | Oct 2018 |
| 306 | Robinson, Gary D | | Oil Operator | Apr 2026 |
| 307 | Roblyn Oil Inc | Allen, OK 74825-6933 | Oil & Gas Operator | Dec 2025 |
| 308 | Robson & Shults Prod Corp | Mannford, OK 74044 | Oil & Gas Operator | Jun 1995 |
| 309 | Robson Petroleum Company | Tulsa, OK 74104 | Oil & Gas Operator | Jan 1995 |
| 310 | Robson Resources Inc | Tulsa, OK 74104 | Oil & Gas Operator | May 1998 |
| 311 | Rock Creek Energy Co | Ada, OK 74820-5725 | Oil Operator | Jul 2022 |
| 312 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 313 | Rock Oil Company | Broken Arrow, OK 74014-6106 | Oil & Gas Operator | Apr 2026 |
| 314 | Rocket Energy Corporation | Muskogee, OK 74402-1665 | Oil & Gas Operator | Dec 2003 |
| 315 | Rocket Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Apr 2015 |
| 316 | Rockford CBM LLC | Tulsa, OK 74103-4335 | Oil & Gas Operator | Jan 2013 |
| 317 | Rockford Energy Partners III,LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2012 |
| 318 | Rockies Resources Holdings LLC | Lakewood, CO 80228 | Oil & Gas Operator | May 2026 |
| 319 | Rockin D Resources LLC | Bristow, OK 74010-4162 | Oil Operator | Apr 2026 |
| 320 | Rockin S Field Service LLC | Stigler, OK 74462 | Gas Operator | Apr 2026 |
| 321 | Rocking Chair Energy Partners LLC | Morris, OK 74445 | Oil & Gas Operator | Apr 2026 |
| 322 | Rocking M Investments, Inc | Francis, OK 74820 | Gas Operator | May 2026 |
| 323 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Apr 2026 |
| 324 | Rockwall Marketing Corporation | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2007 |
| 325 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 326 | Rockwell Energy Corporation | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2014 |
| 327 | Rocky Roads Operating LLC | Tulsa, OK 74103-4048 | Oil & Gas Operator | May 2026 |
| 328 | Rocky Top Energy LLC | Bartlesville, OK 74003 | Oil & Gas Operator | Sep 2025 |
| 329 | Rodgers Donald E Jr | Ripley, OK 74062 | Oil & Gas Operator | Mar 2011 |
| 330 | Rodman George Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 1992 |
| 331 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 332 | Roe Oil Company | Cushing, OK 74023-0086 | Oil & Gas Operator | Nov 2025 |
| 333 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 334 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 335 | Rogers County Coal Seam LLC | Ridgeland, MS 39157-8635 | Oil & Gas Operator | Mar 2015 |
| 336 | Rogers Dan R | Okemah, OK 74847 | Oil & Gas Operator | Apr 2020 |
| 337 | Rogers Jerry L | Cushing, OK 74023-0911 | Oil & Gas Operator | Mar 2017 |
| 338 | Rogers Well Service Inc | Ponca City, OK 74601 | Oil & Gas Operator | Apr 2014 |
| 339 | Rogers, Cora L | | Oil Operator | Apr 2026 |
| 340 | Roka Management Inc | Oklahoma City, OK 73139 | Oil & Gas Operator | Apr 2026 |
| 341 | Roka Resources Inc | Oklahoma City, OK 73139 | Oil & Gas Operator | Apr 2026 |
| 342 | Romax Corporation | Ardmore, OK 73401-8882 | Oil & Gas Operator | Feb 2022 |
| 343 | Romine Oil & Gas LTD | Shawnee, OK 74802-3425 | Oil & Gas Operator | Jan 2013 |
| 344 | Ron & Dan'S Oil LTD | Barnsdall, OK 74002-0628 | Oil & Gas Operator | May 2011 |
| 345 | Ronan Company | Springfield, MO 65704 | Oil & Gas Operator | Aug 2013 |
| 346 | Ronco Energy Resources Inc | Norman, OK 73072 | Oil & Gas Operator | Apr 2015 |
| 347 | Rongey Ira E | Sapulpa, OK 74066-9317 | Oil & Gas Operator | May 2013 |
| 348 | Rongey Oil | Jenks, OK 74037-3621 | Oil & Gas Operator | Jan 2013 |
| 349 | Ronmar Engineering & Expl Inc | Ada, OK 74820-1402 | Oil Operator | Aug 2013 |
| 350 | Roring Jr Roy W | Duncan, OK 73533-3048 | Oil & Gas Operator | Aug 2022 |
| 351 | Roring Roy W | Ardmore, OK 73401 | Oil & Gas Operator | Dec 1998 |
| 352 | Roring Steven A | Ratliff City, OK 73481-0206 | Oil Operator | Feb 2018 |
| 353 | Rose Dan And Bill | Henryetta, OK 74437 | Oil & Gas Operator | Apr 2026 |
| 354 | Rose Operating Company | Tulsa, OK 74101-2391 | Oil & Gas Operator | Dec 2014 |
| 355 | Rose Petroleum Corp | Oklahoma City, OK 73146 | Oil & Gas Operator | Feb 2015 |
| 356 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Apr 2026 |
| 357 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 358 | Rosenthal Henry & Co | | Oil Operator | Feb 1994 |
| 359 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2026 |
| 360 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Jul 2026 |
| 361 | Ross Bobby L | Okmulgee, OK 74447-8802 | Oil & Gas Operator | Apr 2020 |
| 362 | Ross Curtis | Ada, OK 74820-1354 | Oil & Gas Operator | Feb 2012 |
| 363 | Roth Gary E | Tonkawa, OK 74653-2033 | Oil & Gas Operator | Jan 2020 |
| 364 | Rougeot Oil & Gas Corp | Sperry, OK 74073 | Oil & Gas Operator | Apr 2026 |
| 365 | Rough Rider Oil LLC | Booker, TX 79005-0427 | Oil & Gas Operator | Apr 2026 |
| 366 | Roulston Pat | Konawa, OK 74849-4020 | Oil Operator | May 2026 |
| 367 | Roundup Oil LLC | Springer, OK 73458 | Oil & Gas Operator | May 2026 |
| 368 | Rountree Productions LLC | | Oil Operator | Apr 2026 |
| 369 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | Mar 2026 |
| 370 | Rowe Energy | Beggs, OK 74421-0240 | Oil & Gas Operator | Mar 2015 |
| 371 | Rowe Stephen Oil Properties LLC | Hunt, TX 78024 | Oil & Gas Operator | Apr 2020 |
| 372 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | May 2026 |
| 373 | Roxanna Oil Company | Oklahoma City, OK 73120-2717 | Oil Operator | Aug 2016 |
| 374 | Roy G Oil Company | Drumright, OK 74030-1236 | Oil & Gas Operator | Oct 1995 |
| 375 | Roy L Ashton Oil & Gas Production Inc | Sapulpa, OK 74066 | Oil Operator | Apr 2026 |
| 376 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Mar 2026 |
| 377 | Royal Energy Resources LTD | Denver, CO 80221 | Oil & Gas Operator | May 2013 |
| 378 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 379 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 380 | Royal Petroleum | Baytown, TX 77521 | Oil & Gas Operator | Aug 2003 |
| 381 | Royal Petroleum Corp. | Dallas, TX 75229 | Oil & Gas Operator | Jan 2025 |
| 382 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | May 2026 |
| 383 | Royalty Energy Development LLC | Edmond, OK 73003 | Oil & Gas Operator | May 2026 |
| 384 | Royalty Petroleum Company | Oklahoma City, OK 73120 | Gas Operator | Feb 2002 |
| 385 | Roye Realty & Developing Inc | Stigler, OK 74462-0148 | Gas Operator | Dec 2004 |
| 386 | Rozen H H | | Oil Operator | Aug 2022 |
| 387 | Rpa Energy LLC | Ada, OK 74820 | Oil Operator | Apr 2026 |
| 388 | RR Oil Well Operations LLC | Ringwood, OK 73768 | Oil & Gas Operator | May 2026 |
| 389 | RTB Oil Inc | Crescent, OK 73028-0686 | Oil Operator | May 2016 |
| 390 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Jul 2026 |
| 391 | RTD Inc | Bartlesville, OK 74006 | Oil Operator | Jan 1995 |
| 392 | Rue Johnny B | Duncan, OK 73533-2019 | Oil & Gas Operator | Oct 2025 |
| 393 | Ruh Oil Company | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2026 |
| 394 | Rumble Energy LLC | Skiatook, OK 74070 | Oil & Gas Operator | Jul 2026 |
| 395 | Rumley Robert A & Associates | Tulsa, OK 74135-1907 | Oil Operator | Apr 2026 |
| 396 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Mar 2026 |
| 397 | Rush Creek Operating LLC | McKinney, TX 75070 | Oil & Gas Operator | Jul 2026 |
| 398 | Rush-Andrus Engineering | Royse City, TX 75189-1210 | Oil & Gas Operator | Feb 2022 |
| 399 | Russell Carl G | Coweta, OK 74429 | Oil & Gas Operator | Mar 2015 |
| 400 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Apr 2026 |