| 21501 | P & S Energy Inc | Mineral Ridge, OH 44440 | Oil & Gas Operator | Dec 2019 |
| 21502 | P & S Oil And Gas Corporation | | Gas Operator | Dec 1996 |
| 21503 | P & S Production LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2013 |
| 21504 | P & W Oil | Lakewood, CO 80215 | Oil Operator | Sep 1985 |
| 21505 | P & W Well Service Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 21506 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 21507 | P A Energy Inc | Calvin, OK 74531-0248 | Oil & Gas Operator | Apr 2020 |
| 21508 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 21509 | P F Beeler LLC | Norman, OK 73072-7522 | Oil & Gas Operator | Jul 2025 |
| 21510 | P I C Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2013 |
| 21511 | P J Oil Co. | | Oil Operator | Jun 2025 |
| 21512 | P K & L Oil Properties | Shawnee, OK 74802-0931 | Oil & Gas Operator | Mar 2001 |
| 21513 | P O & G Panhandle LP | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 21514 | P P & G Oil | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2024 |
| 21515 | P T C, Inc | Raccoon, KY 41557 | Gas Operator | Dec 2023 |
| 21516 | P T Oil Co Inc | Walters, OK 73572-9505 | Oil Operator | Nov 2014 |
| 21517 | P&F Operations, LLC | Thrall, TX 76578 | Oil Operator | Oct 2025 |
| 21518 | P&H Gas, LLC | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 21519 | P&P Industries, Inc. | Austin, TX 78737 | Oil & Gas Operator | Dec 2002 |
| 21520 | P,B&B Operating Inc. | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |
| 21521 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |
| 21522 | P-2 Exploraton Co Inc | Pampa, TX 79065-2920 | Oil & Gas Operator | Jun 1996 |
| 21523 | P-2 Oil | Vernal, UT 84078 | Oil & Gas Operator | Jul 2000 |
| 21524 | P-K Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 21525 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 21526 | P-Tex Petroleum, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Nov 1999 |
| 21527 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 21528 | P. D. L. Services, Inc. | Minerva, OH 44657 | Oil & Gas Operator | Dec 2024 |
| 21529 | P. G. Oil & Gas, LLC | Clarksburg, WV 26302-2512 | Oil & Gas Operator | Dec 2021 |
| 21530 | P. K. Smith | | Oil Operator | Mar 1997 |
| 21531 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 21532 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 21533 | P. S. & G., Incorporated | | Gas Operator | Aug 1983 |
| 21534 | P.B. Blue Dot Properties | Wexford, PA 15090 | Oil & Gas Operator | Oct 2025 |
| 21535 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 21536 | P.D.T. Drilling Limited Partnership | St. Albans, WV 25177 | Gas Operator | Dec 2021 |
| 21537 | P.I.D. Drilling Inc | Clyde, TX 79510 | Oil & Gas Operator | Oct 2025 |
| 21538 | P.M. Petroleum | | Oil Operator | Mar 1998 |
| 21539 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 21540 | P.O.S. Energy, Inc. | Buna, TX 77612 | Oil & Gas Operator | Oct 2025 |
| 21541 | P.R.P., Inc. | | Oil & Gas Operator | Jun 2025 |
| 21542 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | Oct 2025 |
| 21543 | P.T.L. Operating Co. | | Oil Operator | Jun 2003 |
| 21544 | P1 Energy, LLC | Judson, TX 75660 | Oil & Gas Operator | Oct 2025 |
| 21545 | P3 Production | | Oil Operator | Jun 2025 |
| 21546 | P4 Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 21547 | Pa DCNR State Parks Bur | Harrisburg, PA 17105-8551 | Gas Operator | Dec 2024 |
| 21548 | Pa Dep Ofc Oil & Gas MGMT | Harrisburg, PA 17105-8765 | Gas Operator | Dec 1990 |
| 21549 | Pa Gen Energy Co LLC | Warren, PA 16365-2510 | Oil & Gas Operator | Jul 2025 |
| 21550 | Pa Gen Energy Corp | Warren, PA 16365-2510 | Oil & Gas Operator | Dec 2002 |
| 21551 | Pa Land Holdings Corp | Waynesburg, PA 15370-3020 | Oil & Gas Operator | Dec 2011 |
| 21552 | Pa Land Holdings LLC | Waynesburg, PA 15370-3020 | Gas Operator | Dec 2017 |
| 21553 | Pa Mineral SVCS LLC | Indiana, PA 15701 | Oil & Gas Operator | Dec 2024 |
| 21554 | Pa Prod SVC Inc | Indiana, PA 15701-0421 | Oil & Gas Operator | Dec 2024 |
| 21555 | Pa Prospect LLC | Columbus, MT 59019 | Oil & Gas Operator | Jul 2020 |
| 21556 | Pa State Sys Of Higher Ed Indiana Univ | Indiana, PA 15705-0001 | Gas Operator | Dec 2012 |
| 21557 | Pablo Energy II, LLC | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2025 |
| 21558 | Pablo Energy, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2005 |
| 21559 | Pac Drilling LLC | Bolivar, OH 44612 | Oil & Gas Operator | Dec 2024 |
| 21560 | Pace And Ray Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Oct 2025 |
| 21561 | Pace Co/Chas E Hall | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 21562 | Pace Diversified Corporation | | Oil & Gas Operator | Jul 2025 |
| 21563 | Pace Exploration LLC | Tulsa, OK 74133 | Oil & Gas Operator | May 2025 |
| 21564 | Pace Oil And Gas Company | Austin, TX 78715 | Oil & Gas Operator | Oct 2025 |
| 21565 | Pace Operating | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 21566 | Pace Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 21567 | Pace Production Co. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 21568 | Pace Royalty Trust Fund, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Nov 2001 |
| 21569 | Pace West Production LC | San Angelo, TX 76904 | Oil & Gas Operator | Sep 1995 |
| 21570 | Pacer Resources, Inc. | Calgary, AB T3H 3J9 | Gas Operator | Dec 2001 |
| 21571 | Pacesetter Energy, Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | May 2008 |
| 21572 | Pacesetter Energy, LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2020 |
| 21573 | Pacific Alliance Medical Center | | Oil Operator | Dec 2007 |
| 21574 | Pacific Atlantic Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 21575 | Pacific Atlantic Resources, Inc. | | Oil & Gas Operator | Dec 2021 |
| 21576 | Pacific Coast Energy Company LP | | Oil & Gas Operator | Aug 2025 |
| 21577 | Pacific Energy & Mining Company | Reno, NV 89511 | Oil & Gas Operator | Sep 2022 |
| 21578 | Pacific Energy Resources Inc. | | Oil Operator | Jul 2025 |
| 21579 | Pacific Energy Resources LTD | | Oil & Gas Operator | Sep 2009 |
| 21580 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 21581 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 21582 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 21583 | Pacific Exploration Oper Co, LLC | Houston, TX 77057 | Oil Operator | Oct 2025 |
| 21584 | Pacific Gas And Electric Company | | Gas Operator | Jul 2025 |
| 21585 | Pacific Inland Operating Corporation | | Gas Operator | Dec 1993 |
| 21586 | Pacific Natural Gas Explor | | Oil & Gas Operator | Dec 1974 |
| 21587 | Pacific Operators, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 1999 |
| 21588 | Pacific Palms Petroleum LLC | | Oil & Gas Operator | Jul 2025 |
| 21589 | Pacific Petroleum Technology LLC | | Oil & Gas Operator | Dec 2018 |
| 21590 | Pacific Trans Supply | Vernal, UT 84078 | Oil & Gas Operator | Jul 1987 |
| 21591 | Pack-Man Energy Company | Ranger, TX 76470 | Oil & Gas Operator | Nov 2005 |
| 21592 | Packard Energy LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Jun 2025 |
| 21593 | Packard Gas Company | Irving, TX 75063 | Oil & Gas Operator | Nov 2006 |
| 21594 | Packard, Lynn | Medicine Lodge, KS | Oil & Gas Operator | Jun 2025 |
| 21595 | Pactola Development Co | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2004 |
| 21596 | Pada Petroleum, Inc. | Maple City, KS 67102 | Oil & Gas Operator | Jun 2025 |
| 21597 | Padco LLC | | Oil & Gas Operator | Mar 2025 |
| 21598 | Padgett Oil Inc. | Sedan, KS 67361 | Oil Operator | May 2006 |
| 21599 | Padon, Frank B. Oil Oper., Inc. | Houston, TX 77227 | Oil & Gas Operator | Nov 1998 |
| 21600 | Padre Oil Co. | | Oil & Gas Operator | Aug 2025 |