| 301 | O'Donnell Bill C | Tulsa, OK 74135-4241 | Oil & Gas Operator | Oct 2014 |
| 302 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 303 | Ochiltree Oil Company | Edmond, OK 73034 | Oil & Gas Operator | Apr 2020 |
| 304 | Oil Exploration Of America Inc | Sisseton, SD 57262-9503 | Oil & Gas Operator | Jun 2001 |
| 305 | Oil Patch Energy LLC | Broken Arrow, OK 74014 | Oil & Gas Operator | Jan 2024 |
| 306 | Oklahoma Liquid Resources Inc | Owasso, OK 74055-0841 | Oil & Gas Operator | Jan 2024 |
| 307 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 308 | Oklahoma Rig & Salvage, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 309 | On-Line Oil Inc | Oklahoma City, OK 73105-5208 | Oil & Gas Operator | Mar 2015 |
| 310 | Otc/Occ Not Assigned | | Oil & Gas Operator | Nov 2023 |
| 311 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jan 2024 |
| 312 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Dec 2023 |
| 313 | Paragon Industries Inc | Sapulpa, OK 74066-6987 | Oil Operator | Jan 2024 |
| 314 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 315 | Parish Petroleum Company | Tulsa, OK 74135-4305 | Oil & Gas Operator | Oct 2023 |
| 316 | Park Kenneth Y | Skiatook, OK 74070-6060 | Oil & Gas Operator | Dec 2023 |
| 317 | Park William M | Skiatook, OK 74070-0718 | Oil & Gas Operator | Jan 2024 |
| 318 | Parker James A | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2024 |
| 319 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 320 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 321 | Paystone Oil Corporation | Tulsa, OK 74105 | Oil Operator | Mar 2009 |
| 322 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 323 | Pedocs Inc | Tulsa, OK 74147-0926 | Oil & Gas Operator | Jan 2024 |
| 324 | Pemco LLC | Skiatook, OK 74070-4018 | Oil Operator | Feb 2023 |
| 325 | Petro-Mac Corporation | Tulsa, OK 74101-3405 | Oil & Gas Operator | Jan 2024 |
| 326 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 327 | Petron Energy Inc | Dallas, TX 75252 | Oil & Gas Operator | Apr 2024 |
| 328 | Pillers Chris | | Oil Operator | Jan 2024 |
| 329 | Pinnacle Exploration & Production Co | Kiefer, OK 74041-0460 | Oil & Gas Operator | Jan 2024 |
| 330 | Pinnacle Operating Company LLC | Tulsa, OK 74137-4248 | Oil & Gas Operator | Jan 2024 |
| 331 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 332 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 333 | Pole Cat Oil Company | Sapulpa, OK 74067-0097 | Oil Operator | Jan 2024 |
| 334 | Prosperous Oil & Gas Inc | Kiefer, OK 74041-0843 | Oil & Gas Operator | Jan 2024 |
| 335 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 336 | Pump It Up LLC | | Oil Operator | Jan 2024 |
| 337 | Quad Operating Company | Bulverde, TX 78163-0359 | Oil & Gas Operator | Jan 2024 |
| 338 | R & B Trucking | Crescent, OK 73028-0775 | Oil & Gas Operator | Nov 2021 |
| 339 | R & R Oil Company | Pampa, TX 79065 | Oil & Gas Operator | Jul 2002 |
| 340 | R B Energy, Inc | Manchester, KY 40962 | Oil & Gas Operator | Jan 2015 |
| 341 | R C Oil Company Inc | Nowata, OK 74048-3402 | Oil Operator | Nov 2021 |
| 342 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 343 | Rainwater A L | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2013 |
| 344 | Ramey L E SR | Mounds, OK 74047 | Oil Operator | Jan 2000 |
| 345 | Ramey Oil Corporation | Kiefer, OK 74041-0699 | Oil & Gas Operator | Mar 2021 |
| 346 | Ramey Sharp N Glenn SD Unit | Tulsa, OK 74120 | Oil Operator | Nov 1998 |
| 347 | Ramey Wayne | Mounds, OK 74047-0520 | Oil & Gas Operator | Dec 2023 |
| 348 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 349 | Ranch Creek Exploration LLC | | Oil & Gas Operator | Jan 2024 |
| 350 | Ranger Systems Inc | | Oil Operator | Feb 2020 |
| 351 | Raper Brice Oil Company LLC | Yale, OK 74085-6865 | Oil & Gas Operator | Apr 2015 |
| 352 | Ray'S Oil Company | Boynton, OK 74422 | Oil & Gas Operator | Jan 2024 |
| 353 | RDH Enterprises, Inc. | El Reno, OK 73036 | Oil & Gas Operator | May 2015 |
| 354 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 355 | Reddy Oil & Gas Corporation | Tulsa, OK 74108-5105 | Oil & Gas Operator | Jan 2024 |
| 356 | Reed Power Tongs Inc | Seminole, OK 74818-1462 | Oil & Gas Operator | Jan 2024 |
| 357 | Reliable Oil Industries Inc | Sand Springs, OK 74063-2086 | Oil & Gas Operator | Dec 2023 |
| 358 | Resource Operations, Inc. | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 359 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Jan 2024 |
| 360 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 361 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 362 | Robbins Thomas D & Charlene A Revocable Trust | Plano, TX 75093-7471 | Oil Operator | Jul 2018 |
| 363 | Roberson, Joe | Vernon, TX 76385 | Oil & Gas Operator | Feb 2015 |
| 364 | Roberts Zetau J Fisk | Moore, OK 73160 | Oil & Gas Operator | Sep 1993 |
| 365 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 366 | Rock Creek Energy Co | Ada, OK 74820-5725 | Oil Operator | Jul 2022 |
| 367 | Rock Oil Company | Broken Arrow, OK 74014-6106 | Oil & Gas Operator | Dec 2023 |
| 368 | Rockford CBM LLC | Tulsa, OK 74103-4335 | Oil & Gas Operator | Jan 2013 |
| 369 | Rogers County Coal Seam LLC | Ridgeland, MS 39157-8635 | Oil & Gas Operator | Mar 2015 |
| 370 | Ron & Dan'S Oil LTD | Barnsdall, OK 74002-0628 | Oil & Gas Operator | May 2011 |
| 371 | Rongey Oil | Jenks, OK 74037-3621 | Oil & Gas Operator | Jan 2013 |
| 372 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Jan 2024 |
| 373 | Rowe Energy | Beggs, OK 74421-0240 | Oil & Gas Operator | Mar 2015 |
| 374 | Royal Energy Resources LTD | Denver, CO 80221 | Oil & Gas Operator | May 2013 |
| 375 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 376 | Russell Carl G | Coweta, OK 74429 | Oil & Gas Operator | Mar 2015 |
| 377 | S H Production LLC | Tulsa, OK 74130-1418 | Oil & Gas Operator | Jan 2024 |
| 378 | Sabos George U | Tulsa, OK 74170 | Oil & Gas Operator | Jan 2013 |
| 379 | Sage NR Ok LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 380 | Saiber Michael L & Lora L | Saxonburg, PA 16056 | Oil Operator | Mar 1997 |
| 381 | Sallee Oil Corporation | Collinsville, OK 74021-0550 | Oil & Gas Operator | Jan 2024 |
| 382 | Salty Dog Disposal LLC | | Oil Operator | Mar 2024 |
| 383 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 384 | Sand Springs Oil & Gas Co. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2024 |
| 385 | Schad Jeffrey M | Mannford, OK 74044-0995 | Oil Operator | Sep 2021 |
| 386 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2024 |
| 387 | Searcy Brothers Inc | Tulsa, OK 74135-0433 | Oil Operator | Jun 2004 |
| 388 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 389 | Sellmeyer Eugene | Collinsville, OK 74021 | Oil & Gas Operator | Mar 2015 |
| 390 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 391 | Shadow-Del Oil Company | Kiefer, OK 74041-0453 | Oil & Gas Operator | Jul 2015 |
| 392 | Shallow Energy Inc | South Dennis, MA 02660-2028 | Oil & Gas Operator | Jan 2024 |
| 393 | Shanks Drilling & Production Company LLC | Leonard, OK 74043-0038 | Oil & Gas Operator | Aug 2023 |
| 394 | Shelton Alec & Glenda | Kiefer, OK 74041-0399 | Oil & Gas Operator | Sep 2023 |
| 395 | Shideler Enterprises Inc | Drumright, OK 74030-1233 | Oil & Gas Operator | Feb 2019 |
| 396 | Shipman James E Dba Lazy J Oil Co | Hallett, OK 74034-0033 | Oil Operator | Dec 2023 |
| 397 | Sikes Oil Company Inc | Velma, OK 73091-0759 | Oil & Gas Operator | Jan 2014 |
| 398 | Silvertin Farm Production LLC | | Oil & Gas Operator | Apr 2020 |
| 399 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 400 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |