| 401 | Petroleum Production Engineering | Fulton, TX 78358 | Oil Operator | Feb 2019 |
| 402 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Apr 2024 |
| 403 | Petroleum Properties MGMT Co LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2005 |
| 404 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 405 | Petroleum Property MGMT, Inc (A) | Fort Worth, TX 76101 | Oil & Gas Operator | May 1994 |
| 406 | Petroleum Recovery Systems, L.C. | Houston, TX 77024 | Oil Operator | Apr 2024 |
| 407 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 408 | Petroleum Resource Management Co | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 409 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 410 | Petrolia Energy Corporation | Houston, TX 77024 | Oil Operator | Jan 2024 |
| 411 | Petrolia Group, L.L.C. | Katy, TX 77449 | Oil & Gas Operator | Apr 2024 |
| 412 | Petromac, Inc. | Onalaska, TX 77360 | Oil & Gas Operator | Apr 2024 |
| 413 | Petromark Energy LLC | Oklahoma City, OK 73116-7634 | Oil & Gas Operator | Jun 2000 |
| 414 | Petromining, Inc. | Plano, TX 75026 | Oil & Gas Operator | Apr 2024 |
| 415 | Petron Energy Inc | Dallas, TX 75252 | Oil & Gas Operator | Apr 2024 |
| 416 | Petron Oil Company | Missouri City, TX 77489 | Oil & Gas Operator | Apr 2024 |
| 417 | Petronomics Petroleum, Inc. | Austin, TX 78734 | Oil & Gas Operator | Jan 1995 |
| 418 | Petronomics, Inc. | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 419 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 420 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 421 | Petropoint Energy Operating, LLC | Houston, TX 77098 | Oil & Gas Operator | Apr 2024 |
| 422 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 423 | Petroquest Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2001 |
| 424 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Apr 2024 |
| 425 | Petroquest Exploration, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2008 |
| 426 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | Apr 2024 |
| 427 | Petrosaurus, Inc. | Somerset, TX 78069 | Oil Operator | Apr 2024 |
| 428 | Petrosearch Operating Co, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 429 | Petrosource Energy Corporation | Fort Worth, TX 76112 | Oil & Gas Operator | Apr 2024 |
| 430 | Petrosource Production Co. L.P. | Midland, TX 79701 | Oil & Gas Operator | Nov 2007 |
| 431 | Petrosource Production Co., LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2024 |
| 432 | Petrotex Engineering Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2024 |
| 433 | Petrotex, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 434 | Petrotx Operating, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2024 |
| 435 | Petrox Resources Inc | Meeker, CO 81641 | Oil & Gas Operator | Mar 2024 |
| 436 | PF Operating Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Aug 2003 |
| 437 | Pfed Operating | Keller, TX 76248 | Oil Operator | Apr 2024 |
| 438 | Pfog Operations, LLC | Midland, TX 79710 | Oil Operator | Apr 2024 |
| 439 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 440 | PG&E Resources Offshore Company | Dallas, TX 75206 | Oil & Gas Operator | Oct 1994 |
| 441 | PG-M International Operating,LLC | Borger, TX 79008 | Oil & Gas Operator | Apr 2024 |
| 442 | Pgi Operating, LLC | Sweetwater, TX 79556 | Oil Operator | Apr 2024 |
| 443 | Pgo, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jun 1999 |
| 444 | PH Exploration, Inc. | Houston, TX 77008 | Oil & Gas Operator | Nov 2001 |
| 445 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 446 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2024 |
| 447 | Pheffer Oil, L.L.C. | Laredo, TX 78041 | Oil Operator | Jul 2021 |
| 448 | Phere Operating Inc | Spring Branch, TX 78070 | Oil & Gas Operator | Apr 2024 |
| 449 | Philcon Development Co. | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2014 |
| 450 | Phillips & Pierson | Olney, TX 76374 | Oil & Gas Operator | Nov 1995 |
| 451 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 452 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 453 | Phillips Operating Co. | Mineral Wells, TX 76067 | Oil & Gas Operator | Jan 2013 |
| 454 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 455 | Phillips, B. F. Jr., Estate Of | Dallas, TX 75201 | Oil & Gas Operator | Mar 2011 |
| 456 | Phillips, Bob | Weatherford, TX 76086 | Oil & Gas Operator | Nov 2019 |
| 457 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 458 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | Apr 2024 |
| 459 | Philmar | Lubbock, TX 79403 | Oil Operator | Apr 2024 |
| 460 | Philpott Oil & Gas Co Inc | Atwood, KS 67730 | Oil Operator | Aug 2010 |
| 461 | Phoenix Crude Oil Company | Westbrook, TX 79565 | Oil Operator | Oct 2004 |
| 462 | Phoenix Fund, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2000 |
| 463 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 464 | Phoenix Oil & Gas | Kyle, TX 78640 | Oil & Gas Operator | Apr 2024 |
| 465 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 466 | Phoenix Oil & Gas, Inc. (A) | Canada, 00100 | Oil & Gas Operator | Oct 2005 |
| 467 | Phoenix Operating Company Of TX. | Dallas, TX 75206 | Oil & Gas Operator | Jun 1995 |
| 468 | Phoenix Operating Company, Inc. | Shreveport, LA 71161 | Oil & Gas Operator | Mar 2015 |
| 469 | Phoenix Petrocorp, Inc. | McKinney, TX 75070 | Oil & Gas Operator | Feb 2024 |
| 470 | Phoenix Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2022 |
| 471 | Phylko Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 472 | Pi Energy, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 473 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Feb 2024 |
| 474 | Pickett Oil Co. | Gonzales, TX 78629 | Oil & Gas Operator | Oct 2019 |
| 475 | Pickett, D. W. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 2004 |
| 476 | Picosa, L.L.C. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Apr 2024 |
| 477 | Pie Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2024 |
| 478 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 479 | Pierce Junction Petroleum Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2010 |
| 480 | Pierce Operating Company, L.L.C. | Bryan, TX 77808 | Oil & Gas Operator | Dec 2018 |
| 481 | Pierce Production Company | Eunice, NM 88231 | Oil & Gas Operator | Oct 2012 |
| 482 | Pierce Production Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 483 | Pierce, Ray A. | Eunice, NM 88231 | Oil & Gas Operator | Nov 2004 |
| 484 | Pierco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Apr 2024 |
| 485 | Pikeco Inc | Whitesboro, TX 76273 | Oil & Gas Operator | Nov 2001 |
| 486 | Pilgrim Energy Partners L.L.C. | Fairfield, IL 62837 | Oil Operator | Apr 2024 |
| 487 | Pillar Efs, LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2024 |
| 488 | Pillar Energy, LLC | Charleston, WV 25312-5987-5987 | Oil & Gas Operator | Dec 2023 |
| 489 | Pillows, Burl A. | Houston, TX 77062 | Oil & Gas Operator | Apr 2024 |
| 490 | Pima Energy, LLC | Knott, TX 79748 | Oil & Gas Operator | Apr 2024 |
| 491 | Pine Creek Operating LLC | Colorado SPGS, CO 80903 | Oil & Gas Operator | Jul 2021 |
| 492 | Pine Island Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 493 | Pine Island Production Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2012 |
| 494 | Pine Oil Company | Cibolo, TX 78108 | Oil & Gas Operator | Dec 2022 |
| 495 | Pine Ridge Operating, L.P. | Waelder, TX 78959 | Oil & Gas Operator | Apr 2024 |
| 496 | Pine Wave Energy Partners Op,LLC | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 497 | Pinewood Exploration Inc. | Arlington, TX 76096 | Oil & Gas Operator | Oct 2011 |
| 498 | Pinnacle Mining Corporation | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 499 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Apr 2024 |
| 500 | Pinon Corporation | San Antonio, TX 78266 | Oil & Gas Operator | Jul 2001 |