| 1 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 2 | P.T.L. Operating Co. | | Oil Operator | Jun 2003 |
| 3 | Pace Royalty Trust Fund, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Nov 2001 |
| 4 | Pacific-Atlantic Oil Company, Inc. | | Oil & Gas Operator | Aug 2016 |
| 5 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2024 |
| 6 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2024 |
| 7 | Pan-Ok Production Company | | Oil & Gas Operator | Jul 2024 |
| 8 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 9 | Parker Enterprises, Inc. | | Oil & Gas Operator | Jun 1999 |
| 10 | Parker Oil Company | Abilene, TX 79601 | Oil & Gas Operator | Feb 2024 |
| 11 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 12 | Patkim Production Inc. | | Oil Operator | Jul 2024 |
| 13 | Pearl Resources Inc. | | Oil & Gas Operator | Jul 1990 |
| 14 | Pelican Gas Prod. Assoc. | | Oil & Gas Operator | Oct 1987 |
| 15 | Pennzenergy Explor & Prod LLC | | Oil & Gas Operator | Dec 1999 |
| 16 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 17 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 18 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Jun 2024 |
| 19 | Perkins Oil Properties | | Oil & Gas Operator | May 2024 |
| 20 | Pesco | | Oil & Gas Operator | Oct 1984 |
| 21 | Petro Energy Inc | Farmington, NM 87499 | Oil & Gas Operator | Aug 2024 |
| 22 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 23 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 24 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 25 | Petrol Industries, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Jun 2012 |
| 26 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 27 | Petroleum Investments, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Dec 1977 |
| 28 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Dec 2024 |
| 29 | Petroleum Venture Capitol Corp | | Oil Operator | Jun 1980 |
| 30 | Petrosearch, Inc. | | Oil Operator | Jul 1992 |
| 31 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 32 | Pharaoh Oil, LLC | | Oil Operator | Jul 2024 |
| 33 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 34 | Phoenic Opr Co Inc-SPD | | Oil Operator | Feb 1993 |
| 35 | Phoenix - Comco, Inc. | | Oil Operator | Aug 2004 |
| 36 | Phoenix Oper Co Inc-New Amer | | Oil Operator | Jul 1994 |
| 37 | Phoenix Operating Company, Inc. | Shreveport, LA 71161 | Oil & Gas Operator | Mar 2015 |
| 38 | Phoenix Opr Co Inc - West End | | Oil Operator | Dec 1992 |
| 39 | Phoenix Opr Co Inc-Acc | | Oil Operator | Dec 1992 |
| 40 | Phoenix Opr Co Inc-Amsterdam | | Oil Operator | Nov 1994 |
| 41 | Phoenix Opr Co Inc-Broadway | | Oil Operator | Dec 1992 |
| 42 | Phoenix Opr Co Inc-Caddo | | Oil Operator | Dec 1992 |
| 43 | Phoenix Opr Co Inc-HGC 1985 | | Oil Operator | Dec 1992 |
| 44 | Phoenix Opr Co Inc-New Amer 85 | | Oil Operator | Dec 1992 |
| 45 | Phoenix Opr Co Inc-Northern La | | Oil Operator | Dec 1992 |
| 46 | Phoenix Opr Co Inc-Oc Yacht 85 | | Oil Operator | Dec 1992 |
| 47 | Phoenix Opr Co Inc-Oc Yacht II | | Oil Operator | Dec 1992 |
| 48 | Phoenix Opr Co Inc-Ocean Yacht | | Oil Operator | Dec 1992 |
| 49 | Phoenix Opr Co Inc-Petrovest | | Oil Operator | Dec 1992 |
| 50 | Phoenix Opr Co Inc-PML | | Oil Operator | Dec 1992 |
| 51 | Phoenix Opr Co Inc-Rvside '85 | | Oil Operator | Dec 1992 |
| 52 | Phoenix Opr Co Inc-Salem 1985 | | Oil Operator | Dec 1992 |
| 53 | Phoenix Opr Co Inc-TG I | | Oil Operator | Dec 1992 |
| 54 | Phoenix Opr Co Inc-TG II | | Oil Operator | Dec 1992 |
| 55 | Phoenix Opr Co Inc-Vista | | Oil Operator | Dec 1992 |
| 56 | Pine Island Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 57 | Pine Island Production LLC | | Oil Operator | Jul 2024 |
| 58 | Pine Wave Energy Partners Operating, LLC | | Gas Operator | Apr 2022 |
| 59 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Dec 2024 |
| 60 | Platt Oil Production | | Oil & Gas Operator | Jan 2007 |
| 61 | Pride Exploration, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2015 |
| 62 | Pritchard Engineering | | Oil & Gas Operator | Mar 1989 |
| 63 | Prostar Energy, LLC | | Oil Operator | Sep 2011 |
| 64 | Proven Oil Production | | Oil Operator | Mar 2002 |
| 65 | Pullco Services LLC | | Oil Operator | Jun 2024 |
| 66 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 67 | PXP Louisiana L.L.C. | | Oil & Gas Operator | Nov 2010 |