| 401 | Patrick RJ Operating Co | Liberal, KS 67905-1157 | Oil & Gas Operator | Nov 2014 |
| 402 | Payne Exploration Company | Crescent, OK 73028-0502 | Oil & Gas Operator | Jan 2024 |
| 403 | Payne W C Family Trust | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Mar 2015 |
| 404 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 405 | Pennmark Resources Company | Edmond, OK 73013 | Oil & Gas Operator | Jan 2024 |
| 406 | Pepin Oil Co | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2013 |
| 407 | Pet-Ex, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2023 |
| 408 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 409 | Petroleum Exploration Company LTD LP | | Oil & Gas Operator | Feb 2024 |
| 410 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 411 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Apr 2024 |
| 412 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 413 | Phoenix Petrocorp, Inc. | McKinney, TX 75070 | Oil & Gas Operator | Feb 2024 |
| 414 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2024 |
| 415 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2024 |
| 416 | Plains Marketing & Trans Inc | Houston, TX 76002 | Oil & Gas Operator | Oct 1998 |
| 417 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 418 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 419 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 420 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 421 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Apr 2024 |
| 422 | Prentice Napier & Green Inc | Oklahoma City, OK 73172-1424 | Oil & Gas Operator | Feb 2024 |
| 423 | Presidio Petroleum LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 424 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 425 | Primary Fuels Inc | Midland, TX 79701-4410 | Oil & Gas Operator | Mar 1991 |
| 426 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 427 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 428 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2024 |
| 429 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 430 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 431 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 432 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jan 2024 |
| 433 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Apr 2024 |
| 434 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 435 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 436 | R D T Properties | Tulsa, OK 74105-7122 | Oil & Gas Operator | Sep 2017 |
| 437 | Rama Operating Co., Inc. | Stafford, KS 67578 | Oil & Gas Operator | Feb 2024 |
| 438 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 439 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Mar 2024 |
| 440 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 441 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2024 |
| 442 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 443 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2024 |
| 444 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 445 | Redline Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 446 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 447 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 448 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2024 |
| 449 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Jan 2024 |
| 450 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 451 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Apr 2024 |
| 452 | Rives Owen H | Holdenville, OK 74848-0913 | Oil & Gas Operator | Nov 2000 |
| 453 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 454 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Feb 2024 |
| 455 | Robertson Wayne H | Elkhart, KS 67590 | Oil Operator | Dec 2012 |
| 456 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 457 | Root W C | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2021 |
| 458 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 459 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 460 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Apr 2024 |
| 461 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2023 |
| 462 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 463 | Sage Drilling Co | Wichita, KS 67202 | Oil & Gas Operator | Nov 1998 |
| 464 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Apr 2024 |
| 465 | Salty Dog Disposal LLC | | Oil Operator | Mar 2024 |
| 466 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 467 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 468 | Sandia Operating Corp. | San Antonio, TX 78270 | Oil & Gas Operator | May 2010 |
| 469 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 470 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 471 | Scarth Oil & Gas Co | Amarillo, TX 79101 | Oil & Gas Operator | Feb 1999 |
| 472 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Apr 2024 |
| 473 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 474 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 475 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 476 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 477 | Select Exploration Group LLC | | Oil & Gas Operator | Dec 2023 |
| 478 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 479 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 480 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 481 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 482 | Seven J Oil Inc | Jenning, OK 74038-9729 | Oil & Gas Operator | Jan 2024 |
| 483 | Seventy-One Inc | | Oil & Gas Operator | May 1999 |
| 484 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 485 | Shields Cooper | Bonita Springs, FL 34135-3421 | Oil & Gas Operator | Jan 2011 |
| 486 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Nov 2023 |
| 487 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 488 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 489 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Feb 2024 |
| 490 | Sorrels J R Dba Cheyenne Oil Properties | Ponca City, OK 74602-0067 | Oil & Gas Operator | Jul 2022 |
| 491 | Southern Star Central Gas Pipeline, Inc. | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2023 |
| 492 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 493 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 494 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 495 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Jan 2024 |
| 496 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Feb 2024 |
| 497 | Spring Operating Company | Edmond, OK 73083-2048 | Oil & Gas Operator | Feb 2024 |
| 498 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 499 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 500 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2024 |