| 1 | P & A Oilfield Services, Inc. | | Oil & Gas Operator | Jan 1998 |
| 2 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 3 | P & M Petroleum | | Oil Operator | Mar 1998 |
| 4 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 5 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 6 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 7 | P. K. Smith | | Oil Operator | Mar 1997 |
| 8 | P. S. & G., Incorporated | | Gas Operator | Aug 1983 |
| 9 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 10 | P.T.L. Operating Co. | | Oil Operator | Jun 2003 |
| 11 | Pace Royalty Trust Fund, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Nov 2001 |
| 12 | Pacific Atlantic Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 13 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 14 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 15 | Page Development, L.L.C. | | Oil Operator | Dec 2024 |
| 16 | Painter Oil And Gas LTD. | | Oil & Gas Operator | Jun 1986 |
| 17 | Palace Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2007 |
| 18 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 19 | Paladin Petroleum III, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Jul 2026 |
| 20 | Palm Energy Offshore, L.L.C. | | Oil & Gas Operator | Apr 2019 |
| 21 | Palmer Petroleum, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 22 | Palmetto Oil Co., Inc. | | Oil & Gas Operator | Jan 2025 |
| 23 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 24 | Pan Petroleum MLP | Kansas City, MO 64114 | Oil & Gas Operator | Aug 1997 |
| 25 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 26 | Panaco Production Co | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 27 | Panaco, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 28 | Panenergy La Intrastate Co | | Oil Operator | Mar 2000 |
| 29 | Panotech Exploration Corp. | | Oil & Gas Operator | Jan 1983 |
| 30 | Panther Bayou Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2021 |
| 31 | Paoco-Walker | | Gas Operator | Sep 2011 |
| 32 | Par Expl Co & Taurus Petroleum | | Gas Operator | Mar 1984 |
| 33 | Par Exploration Co | | Oil & Gas Operator | Oct 1986 |
| 34 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2026 |
| 35 | Par Oil Corporation | | Oil & Gas Operator | Sep 1990 |
| 36 | Par Oil Corporation, Et Al | | Oil & Gas Operator | Dec 1984 |
| 37 | Par-Naylor | | Oil Operator | Mar 1985 |
| 38 | Paradigm Energy LLC | Lenexa, KS 66227 | Oil & Gas Operator | Dec 2024 |
| 39 | Paragon Resources, Inc | | Oil & Gas Operator | Nov 1991 |
| 40 | Park Exploration Inc | | Oil & Gas Operator | Nov 2012 |
| 41 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 42 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 43 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 44 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 45 | Parker Enterprises, Inc. | | Oil & Gas Operator | Jun 1999 |
| 46 | Parker Oil Company | Abilene, TX 79601 | Oil & Gas Operator | Feb 2024 |
| 47 | Parnes Oil Company | | Oil Operator | Jul 1994 |
| 48 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 49 | Patkim Production Inc. | | Oil Operator | Jan 2025 |
| 50 | Patrick Petroleum Corporation | | Oil & Gas Operator | Oct 1984 |
| 51 | Patterson Resources, Inc. | | Oil & Gas Operator | Apr 1984 |
| 52 | Patton Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 53 | Paul E. Cameron, Jr., Inc. | | Oil & Gas Operator | May 2003 |
| 54 | Paul Gowan-Miss. Ventures | | Gas Operator | Jan 1990 |
| 55 | Paul Guido | | Oil Operator | Oct 1998 |
| 56 | Paul J. Ross | | Oil Operator | Dec 1986 |
| 57 | Paul M. Toce | | Oil & Gas Operator | Jul 1984 |
| 58 | Pawnee Oil And Gas, Inc. | Richardson, TX 75083 | Oil & Gas Operator | May 2023 |
| 59 | Paxton Oil Company | | Oil & Gas Operator | Dec 2024 |
| 60 | Paxton Petroleum, LTD. | | Oil & Gas Operator | May 1989 |
| 61 | Pay Oil, L. L. C. | | Oil & Gas Operator | Jan 2025 |
| 62 | Pay Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 63 | Pay Ventures, L.L.C. | | Oil Operator | Dec 2024 |
| 64 | Peachtree Production Co. | | Oil & Gas Operator | Mar 1981 |
| 65 | Peak Operating Co. | | Oil & Gas Operator | Jul 2024 |
| 66 | Pearl Resources Inc. | | Oil & Gas Operator | Jul 1990 |
| 67 | Pecos Petroleum Company | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 68 | Pecos Western Corporation | | Gas Operator | Feb 1992 |
| 69 | Pedernales Petroleum Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 70 | Pedernales Production, LP | Houston, TX 77057 | Oil & Gas Operator | Mar 2022 |
| 71 | Pel-Tex - McMoran | | Oil & Gas Operator | Dec 1985 |
| 72 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 73 | Pel-Tex Oil Company, LLC | | Oil & Gas Operator | Nov 2010 |
| 74 | Pel-Tex, Inc. | | Oil & Gas Operator | Jul 1985 |
| 75 | Pelican Dome Exploration Inc | Harahan, LA 70123 | Oil & Gas Operator | Aug 2000 |
| 76 | Pelican Gas Prod. Assoc. | | Oil & Gas Operator | Oct 1987 |
| 77 | Pelican Producing Co. | | Gas Operator | Nov 1992 |
| 78 | Pelico Pipeline, LLC | | Oil Operator | Dec 2024 |
| 79 | Pelto Oil Company | Houston, TX 77002 | Oil & Gas Operator | Nov 1998 |
| 80 | Pend Oreille Oil & Gas Company | | Oil & Gas Operator | Sep 1989 |
| 81 | Pengo Petroleum Inc | | Oil & Gas Operator | Dec 2013 |
| 82 | Pengo Petroleum, Inc. & J.W.S. | | Oil & Gas Operator | Jul 1977 |
| 83 | Pengo Producing Company | | Oil & Gas Operator | Mar 1987 |
| 84 | Penn Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Sep 1987 |
| 85 | Penn VIrginia Oil & Gas Corp | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 86 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 87 | Pennington Oil & Gas Int, LLC | | Oil & Gas Operator | Dec 2024 |
| 88 | Pennington Operating Company, LLC | | Oil & Gas Operator | Jul 2020 |
| 89 | Pennzenergy Explor & Prod LLC | | Oil & Gas Operator | Dec 1999 |
| 90 | Pennzoil Company | Midland, TX 79710-0090 | Oil & Gas Operator | Mar 2000 |
| 91 | Pennzoil E & P & M H Marr | | Oil & Gas Operator | Sep 1993 |
| 92 | Pennzoil E & P Co - Arco | | Oil & Gas Operator | Dec 1993 |
| 93 | Pennzoil E & P Co - Clark Oil | | Oil & Gas Operator | Apr 1980 |
| 94 | Pennzoil E & P Co Et Al | | Oil & Gas Operator | Feb 1999 |
| 95 | Pennzoil E & P Co-Sohio Et Al | | Oil & Gas Operator | Jun 1991 |
| 96 | Pennzoil E & P Co-Sohio Petr | | Oil & Gas Operator | Feb 1999 |
| 97 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 98 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 99 | Pentagon Petroleum, Inc. | | Oil & Gas Operator | Sep 1991 |
| 100 | Penton And Penton | | Oil & Gas Operator | Jan 1983 |