| 1901 | Prize Exploration, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 1902 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 1903 | Prize Petroleum, LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2012 |
| 1904 | Pro NM Energy Inc | Santa Fe, NM 87508 | Oil & Gas Operator | Oct 2015 |
| 1905 | Pro Oil & Gas Inc | Frankfort, IL 60423 | Oil & Gas Operator | May 2014 |
| 1906 | Pro- Gas, Inc. | Midland, TX 79711 | Oil & Gas Operator | Apr 2025 |
| 1907 | Pro-Energy Inc | Tulsa, OK 74136-5925 | Oil Operator | Jan 2025 |
| 1908 | Pro-Test, Inc. | Kilgore, TX 75663 | Oil Operator | Apr 2025 |
| 1909 | Pro. Energy I Resource, LLC | Haslet, TX 76052 | Oil Operator | Apr 2025 |
| 1910 | Pro3 Sulfur Solutions, Inc. | Russell, KS 67665 | Oil Operator | Sep 2024 |
| 1911 | Probe Exploration Company | Abilene, TX 79605 | Oil & Gas Operator | Apr 2025 |
| 1912 | Probe Offshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 1913 | Probe Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jul 2016 |
| 1914 | Probity Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Jul 2014 |
| 1915 | Procell & Procell | | Oil & Gas Operator | Jan 2003 |
| 1916 | Proco | Wooster, OH 44691 | Oil Operator | Dec 1988 |
| 1917 | Proco Operating Co., Inc. | Graford, TX 76449 | Oil & Gas Operator | Apr 2025 |
| 1918 | Proctor Dale & Mildred | Wetumka, OK 74883-6272 | Gas Operator | Jan 2025 |
| 1919 | Producers Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 2000 |
| 1920 | Producers Engineering Company | Destin, FL 32541 | Oil & Gas Operator | Sep 1999 |
| 1921 | Producers Environmental Ser. Inc | Borger, TX 79008 | Oil & Gas Operator | Apr 2025 |
| 1922 | Producers Equipm | | Oil Operator | Dec 1996 |
| 1923 | Producers Gas Transmission Inc | | Oil Operator | Nov 2024 |
| 1924 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 1925 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 1926 | Producers Well Service, Inc. | Boling, TX 77420 | Oil & Gas Operator | Apr 2025 |
| 1927 | Producing Royalties Inc | Lubbock, TX BADADDR | Gas Operator | Aug 2004 |
| 1928 | Production Compa | | Oil Operator | Apr 1985 |
| 1929 | Production Consultants, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Feb 2017 |
| 1930 | Production Disbursement, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2011 |
| 1931 | Production Drill | | Oil Operator | Oct 1994 |
| 1932 | Production Drilling, Inc. | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 1933 | Production Enterprises | Houston, TX 77075 | Oil & Gas Operator | Aug 2007 |
| 1934 | Production Funds Inc | | Oil & Gas Operator | Nov 2001 |
| 1935 | Production Gathering Co | Dallas, TX 75243 | Oil & Gas Operator | Apr 2009 |
| 1936 | Production Gathering Company, LP | Dallas, TX 75206 | Oil & Gas Operator | Apr 2025 |
| 1937 | Production Gauging Service Inc | | Oil Operator | Feb 1999 |
| 1938 | Production Maintenance Service | | Oil & Gas Operator | Jun 2020 |
| 1939 | Production Manag | | Oil Operator | Dec 1986 |
| 1940 | Production Management Associates | Plano, TX 75075 | Oil & Gas Operator | Apr 2025 |
| 1941 | Production Management Corp. | | Oil & Gas Operator | Jul 1987 |
| 1942 | Production Management Inc | | Oil & Gas Operator | Jul 2021 |
| 1943 | Production Marketing Assoc Inc | Plano, TX 75075 | Oil & Gas Operator | Apr 2025 |
| 1944 | Production Operators Of TX, LLC | Abilene, TX 79605 | Oil & Gas Operator | Apr 2025 |
| 1945 | Production Resources, Inc. | Castroville, TX 78009 | Oil & Gas Operator | Apr 2025 |
| 1946 | Production Service Co. | Lubbock, TX 79490 | Oil & Gas Operator | Oct 2015 |
| 1947 | Production Specialties Company | | Oil & Gas Operator | Dec 2003 |
| 1948 | Production Systems Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 1949 | Production Team | | Oil & Gas Operator | Sep 1991 |
| 1950 | Proex Energy Corp | | Oil & Gas Operator | Dec 1997 |
| 1951 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Apr 2025 |
| 1952 | Professional Management GRP,Inc. | Boerne, TX 78006 | Oil & Gas Operator | Aug 1999 |
| 1953 | Professional Management Serv | | Oil Operator | Mar 1991 |
| 1954 | Professional Oilfield Services, Inc. | Byesville, OH 43723 | Oil & Gas Operator | Dec 2021 |
| 1955 | Professional Petr. Servs, Inc. | | Oil Operator | Oct 2016 |
| 1956 | Profit Energy Company | Jerusalem, OH 43747 | Oil & Gas Operator | Dec 2023 |
| 1957 | Progas Operating, Inc | Red Rock, TX 78662 | Oil & Gas Operator | Apr 2025 |
| 1958 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Apr 2025 |
| 1959 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 1960 | Progress Petroleum Co. | | Oil & Gas Operator | Apr 1993 |
| 1961 | Progressive Gas Services Inc. | Houston, TX 77279 | Oil & Gas Operator | Feb 2002 |
| 1962 | Progressive Oil & Gas | Moxahala, OH 43761 | Oil & Gas Operator | Dec 2023 |
| 1963 | Project Design Specialists Inc | | Oil & Gas Operator | May 1991 |
| 1964 | Projj Energy LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Apr 2025 |
| 1965 | Prolific Resources LLC | Wichita, KS 67208 | Oil & Gas Operator | Dec 2024 |
| 1966 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2025 |
| 1967 | Prolithic Energy Company, L.P. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2002 |
| 1968 | Promise Energy Operations, LLC | Texas City, TX 77592 | Oil Operator | Apr 2025 |
| 1969 | Prompt Operating LLC | Velma, OK 73491 | Oil Operator | Feb 2025 |
| 1970 | Pronghorn Management Corporation | Hobbs, NM 88241 | Oil & Gas Operator | Apr 2025 |
| 1971 | Pronghorn Operating LLC | | Oil Operator | Jan 2023 |
| 1972 | Pronto Services | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 1973 | Propel Energy Company | | Oil Operator | Oct 1991 |
| 1974 | Propel Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2013 |
| 1975 | Property Development Group, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2025 |
| 1976 | Property Producing Co. | Columbus, TX 78934 | Gas Operator | Apr 2025 |
| 1977 | Propp Production | Azle, TX 76020 | Oil & Gas Operator | Apr 2007 |
| 1978 | Prospctv Invstmnt & TRDG Co, LTD | Tulsa, OK 74170 | Oil & Gas Operator | May 2001 |
| 1979 | Prospect Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 1980 | Prospect Enterprises Inc | Wetumka, OK 74883-0068 | Oil & Gas Operator | Apr 2004 |
| 1981 | Prospect Oil & G | | Oil Operator | Feb 1996 |
| 1982 | Prospect Oil & Gas Corp | Russell, KS 67665 | Oil Operator | Dec 2024 |
| 1983 | Prospecta Energy Group, Inc. | Brownwood, TX 76801 | Oil Operator | Apr 2025 |
| 1984 | Prospective Inv. & Trading Co., LTD., The | Tulsa, OK 74170 | Oil Operator | Dec 2019 |
| 1985 | Prospective Invest & Trad Co LTD | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2005 |
| 1986 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 1987 | Prospective Investment & Trading Co., LTD., The | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 1988 | Prospective Investment & Trding Co LTD | | Oil & Gas Operator | Sep 2012 |
| 1989 | Prospective Investment And Trading Co (The) | Tulsa, OK 741702320 | Oil & Gas Operator | Jun 2005 |
| 1990 | Prospective Invs | | Oil & Gas Operator | Jun 1994 |
| 1991 | Prospectors LTD., The | Somerset, TX 78069 | Oil & Gas Operator | Jun 2002 |
| 1992 | Prosper Energy Corporation | | Oil & Gas Operator | Oct 1988 |
| 1993 | Prosper Oil & Gas,Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 1994 | Prospera Energy, Inc. | | Oil & Gas Operator | Dec 2005 |
| 1995 | Prosperous Oil & Gas Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2025 |
| 1996 | Prostar Energy, LLC | | Oil Operator | Sep 2011 |
| 1997 | Protege Energy II LLC | Tulsa, OK 74135-3252-3252 | Oil & Gas Operator | Dec 2013 |
| 1998 | Protege Energy III LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 1999 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 2000 | Proteus Petroleum, Inc. | | Oil & Gas Operator | Nov 1983 |