| 401 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 402 | Midwest Pipe & Supply Company | Oklahoma City, OK 73154-0245 | Oil & Gas Operator | Dec 2008 |
| 403 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 404 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 405 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 406 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | May 2026 |
| 407 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Jan 2026 |
| 408 | Moore Investments LC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2023 |
| 409 | Moran Oil Enterprises LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2019 |
| 410 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2026 |
| 411 | Moran-Kahn Oil | Seminole, OK 74868 | Oil & Gas Operator | Mar 1992 |
| 412 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 413 | Nadel And Gussman LLC | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2026 |
| 414 | Nail Stephen Dba Nail Oil & Gas | Maud, OK 74854 | Oil Operator | Aug 2025 |
| 415 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Jun 2026 |
| 416 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2026 |
| 417 | Newell Oil And Gas LLC | Shawnee, OK 74801-5783 | Oil & Gas Operator | May 2026 |
| 418 | Nitro Petroleum Inc | Phoenix, AZ 85016-4599 | Oil & Gas Operator | May 2020 |
| 419 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 420 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Sep 2026 |
| 421 | Oak Hills Drilling & Oper., LLC | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 422 | Oak Hills Energy Inc | Holdenville, OK 74848-0470 | Oil & Gas Operator | Sep 2014 |
| 423 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 424 | Oasis Energy Resources LLC | Norman, OK 73072-9668 | Oil & Gas Operator | Jun 2025 |
| 425 | Octagon Resources LLC | Norman, OK 73071-1295 | Oil & Gas Operator | May 2015 |
| 426 | Odessa Oil Investment Co., Inc. | Odessa, TX 79762 | Oil & Gas Operator | Nov 2016 |
| 427 | Oil Center Operating Inc | Fort Worth, TX 76102-5108 | Oil & Gas Operator | Apr 2014 |
| 428 | Oil Production Systems Inc | Cushing, OK 74023 | Oil & Gas Operator | Jan 2013 |
| 429 | Okla Sub-Surface Pump & Supply Co | Ada, OK 74820 | Oil & Gas Operator | Sep 2024 |
| 430 | Oklahoma Basic Economy Corp | Houston, TX 77002-6003 | Oil & Gas Operator | Apr 2020 |
| 431 | Oklahoma Equipment & Salvage | Oklahoma City, OK 73120-5903 | Oil & Gas Operator | Mar 2015 |
| 432 | Oklahoma Liquid Resources Inc | Collinsville, OK 74021 | Oil & Gas Operator | May 2026 |
| 433 | Oklahoma Oil & Gas MGMT Inc | Edmond, OK 73083-6786 | Oil & Gas Operator | Apr 2026 |
| 434 | Okland Oil Company | Oklahoma City, OK 73102-9022 | Oil & Gas Operator | Jun 2026 |
| 435 | Onshore Royalties LLC | Houston, TX 77269 | Oil & Gas Operator | Jun 2026 |
| 436 | Orca Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 437 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jun 2026 |
| 438 | Pace Exploration LLC | Tulsa, OK 74133 | Oil & Gas Operator | Apr 2026 |
| 439 | Pace Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 2026 |
| 440 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 441 | Paleo, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2026 |
| 442 | Palm Operating LLC | Oklahoma City, OK 73106-5646 | Oil & Gas Operator | Nov 2019 |
| 443 | Paluca Petroleum Inc. | Holdenville, OK 74848 | Oil & Gas Operator | May 2026 |
| 444 | Parkinsol Oil Company | Seminole, OK 74868-1648 | Oil & Gas Operator | Oct 2014 |
| 445 | Parsons Engineering Corporation | Tulsa, OK 74137-7505 | Oil & Gas Operator | Oct 2017 |
| 446 | Patco Investments Inc | Seminole, OK 74868 | Oil Operator | Nov 2007 |
| 447 | Patterson Russell B | Wewoka, OK 74884-1262 | Oil & Gas Operator | Feb 2020 |
| 448 | Paul Gillham Oil Company | Maud, OK 74854 | Oil & Gas Operator | May 2026 |
| 449 | PCL Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | May 2026 |
| 450 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 451 | Pennant Energy LLC | Oklahoma City, OK 73116 | Oil Operator | Dec 2024 |
| 452 | Pennant Oil & Gas LLC | Oklahma City, OK 73159-6905 | Oil & Gas Operator | Jan 2024 |
| 453 | Pennmark Resources Company | Edmond, OK 73013 | Oil & Gas Operator | May 2026 |
| 454 | Petro Davis Inc | Oklahoma City, OK 73142-1807 | Oil & Gas Operator | Jan 2013 |
| 455 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 456 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 457 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 458 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 459 | Pheldon Oil Production Inc | Asher, OK 74826-2629 | Oil & Gas Operator | Jun 2026 |
| 460 | Phoenix Oil & Gas Inc | Seminole, OK 74868 | Oil & Gas Operator | May 2025 |
| 461 | Pinnacle Corporation (The) | Broken Arrow, OK 74012 | Oil & Gas Operator | Nov 2014 |
| 462 | Pogue Randall | Ada, OK 74821-1547 | Oil & Gas Operator | Apr 2014 |
| 463 | Positive Energy LLC | Ada, OK 74820 | Oil & Gas Operator | Jun 2026 |
| 464 | Postrock Midcontinent Production LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2026 |
| 465 | PRDJ Cockrum Enterprises, Inc. | Okemah, OK 74859-5126 | Oil & Gas Operator | Mar 2022 |
| 466 | Presley Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2026 |
| 467 | Presley Petroleum Company | Newport Beach, CA 92658-2200 | Oil & Gas Operator | Oct 1999 |
| 468 | Prime Energy Corp | Charleston, WV 25301-1707 | Oil & Gas Operator | Sep 2015 |
| 469 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 470 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Sep 2026 |
| 471 | Pro-Energy Inc | Tulsa, OK 74136-5925 | Oil Operator | Jan 2026 |
| 472 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 473 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 474 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | May 2026 |
| 475 | Pryor VIctor W Jr | Holdenville, OK 74848 | Oil & Gas Operator | Apr 2017 |
| 476 | Psa Inc | Chandler, OK 74834-4222 | Oil & Gas Operator | May 2026 |
| 477 | Pump It Up LLC | Owasso, OK 74055-0723 | Oil Operator | Jun 2024 |
| 478 | Pure Oil Co | | Oil & Gas Operator | Dec 1996 |
| 479 | Pybas Robert | Wanette, OK 74878 | Oil Operator | Apr 2014 |
| 480 | Pyro Energy Corp | Kingwood, TX 77339-2102 | Oil & Gas Operator | Mar 1998 |
| 481 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | May 2026 |
| 482 | Quanah Company | Tulsa, OK 74159-0469 | Oil & Gas Operator | May 2020 |
| 483 | Quest Cherokee LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 484 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 485 | R & C Oil And Gas Inc | Ada, OK 74820-3150 | Oil Operator | Jul 2016 |
| 486 | R J Exploration LLC | Konawa, OK 74849 | Oil & Gas Operator | Jun 2026 |
| 487 | R K R Exploration | Seminole, OK 74868-9754 | Oil & Gas Operator | Mar 2015 |
| 488 | R W Production Company Inc | Ada, OK 74821-2693 | Oil & Gas Operator | Apr 2011 |
| 489 | Radford Dale | Konawa, OK 74849 | Oil & Gas Operator | Apr 2026 |
| 490 | Rainbow Energy Inc | | Oil & Gas Operator | Jul 2024 |
| 491 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 492 | Ramhead Petroleum Inc | Seminole, OK 74818-0848 | Oil & Gas Operator | Aug 2008 |
| 493 | Ramsey Property Management LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2026 |
| 494 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 495 | Randy And Jan Walker Oil Company LLC | Konawa, OK 74849-9333 | Oil & Gas Operator | Jun 2026 |
| 496 | Ranger Systems Inc | Tulsa, OK 74114 | Oil Operator | Feb 2020 |
| 497 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | May 2026 |
| 498 | Raw Crude Oil & Gas, L.L.C. | Norman, OK 73069 | Oil & Gas Operator | May 2026 |
| 499 | Reach Oil And Gas Company Inc | Oklahoma City, OK 73118-1100 | Oil & Gas Operator | May 2026 |
| 500 | Red Fork Oil Co | Lakewood, CO 80215 | Oil & Gas Operator | Aug 1993 |