| 401 | Parapetroleum | Kerrville, TX 78028 | Oil & Gas Operator | Feb 1997 |
| 402 | Parker & Parsley Acq. Group LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 403 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 404 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 405 | Parker & Parsley Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2000 |
| 406 | Parsley Energy Operations, LLC | Irving, TX 75038 | Oil & Gas Operator | Jan 2021 |
| 407 | Partee Drilling Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 408 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 409 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 410 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 411 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 412 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 413 | Pecos Operating Company, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2021 |
| 414 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 415 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 416 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | May 2025 |
| 417 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 418 | Petco Energy Corporation | Hinsdale, IL 60521 | Oil & Gas Operator | Jul 2025 |
| 419 | Petco Petroleum Corp | Hinsdale, IL 60521 | Oil & Gas Operator | Apr 2025 |
| 420 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 421 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 422 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 423 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 424 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 425 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 426 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 427 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 428 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 429 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Jul 2025 |
| 430 | Phillips, Bob | Weatherford, TX 76086 | Oil & Gas Operator | Nov 2019 |
| 431 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 432 | Pillar Energy, LLC | Charleston, WV 25312-5987 | Oil & Gas Operator | Dec 2024 |
| 433 | Pioneer Energy Corporation | Dallas, TX 75204 | Oil & Gas Operator | Jul 2025 |
| 434 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 435 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 436 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 437 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 438 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 439 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Jul 2025 |
| 440 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 441 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 442 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 443 | Powell, A. Brandt | Coleman, TX 76834 | Oil & Gas Operator | Mar 1999 |
| 444 | Powell, A. Brandt Co. | Hawley, TX 79525 | Oil & Gas Operator | Jul 2025 |
| 445 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 446 | Premier Natural Resources, L.P. | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2007 |
| 447 | Premier Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 448 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 449 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 450 | Prospctv Invstmnt & TRDG Co, LTD | Tulsa, OK 74170 | Oil & Gas Operator | May 2001 |
| 451 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 452 | Purvis, J. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 453 | Q Natural Resources, LLC | Jones, OK 73049 | Oil & Gas Operator | Jul 2025 |
| 454 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Apr 2025 |
| 455 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 456 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 457 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Jul 2025 |
| 458 | Rafter T Resources LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 459 | Ram Energy LLC | Tulsa, OK 74152 | Oil & Gas Operator | Apr 2025 |
| 460 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2025 |
| 461 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 462 | Rangeland Exploration Company | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 463 | Rangeland Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2002 |
| 464 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Jul 2025 |
| 465 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 466 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 467 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 468 | Redwood Oil & Gas | McKinney, TX 75070 | Oil & Gas Operator | Apr 2013 |
| 469 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2025 |
| 470 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 471 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 472 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 473 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Jul 2025 |
| 474 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 475 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 476 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Jul 2025 |
| 477 | Rio Oil And Gas (Permian) II,LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Nov 2024 |
| 478 | Rivercity Operating, Inc. | Austin, TX 78766 | Oil & Gas Operator | Jul 2025 |
| 479 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2025 |
| 480 | RMC Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1996 |
| 481 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 482 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 483 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jul 2025 |
| 484 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 485 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 486 | Rover Petroleum Operating, LLC | Plano, TX 75075 | Oil & Gas Operator | Jul 2025 |
| 487 | Royalty Land & Dev. Co., Inc. | Wolfforth, TX 79382 | Oil & Gas Operator | Jul 2025 |
| 488 | RP Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 489 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 490 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |
| 491 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Jul 2025 |
| 492 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 493 | Saga Pet. LTD Liability Co Of Co | Midland, TX 79701 | Oil & Gas Operator | Apr 2004 |
| 494 | Saguaro Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 495 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 496 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 497 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 498 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 499 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 500 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |