| 1901 | Prime Western Development, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Dec 1998 |
| 1902 | Primera Energy, LLC | Longview, TX 75606 | Oil & Gas Operator | Mar 2016 |
| 1903 | Primero Operating, Inc. | Roswell, NM 88202 | Oil & Gas Operator | Jun 2022 |
| 1904 | Primewest Petroleum Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jan 2009 |
| 1905 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 1906 | Primo Petroleum, LLC | Austin, TX 78729 | Oil Operator | Dec 2019 |
| 1907 | Primos & Luffey Gas Co. | | Gas Operator | May 2021 |
| 1908 | Primos Oil & Gas Corp. | | Gas Operator | Dec 2001 |
| 1909 | Primos Production | | Oil & Gas Operator | Dec 2024 |
| 1910 | Primos-Pennzoil JV | | Gas Operator | Feb 2005 |
| 1911 | Primos-Tomlinson | | Gas Operator | Sep 1996 |
| 1912 | Primrose Jimmie | | Oil Operator | Feb 1998 |
| 1913 | Primrose Oil LLC | Oil Springs, KY 41238 | Oil & Gas Operator | Dec 2023 |
| 1914 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 1915 | Primrose Resources, LLC | Cedar Park, TX 78630 | Oil & Gas Operator | Feb 2026 |
| 1916 | Princ, Frank | Wilson, KS 67490 | Oil Operator | Apr 2025 |
| 1917 | Prince Brothers Drilling Co | Electra, TX 76360 | Oil & Gas Operator | Apr 2015 |
| 1918 | Prince Petroleum Company, Inc. | Salem, WV 26426 | Oil & Gas Operator | Dec 2014 |
| 1919 | Prince Properties, Inc. | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |
| 1920 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 1921 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Feb 2026 |
| 1922 | Princeton Natural Gas LLC | | Gas Operator | Nov 2025 |
| 1923 | Principal Oil Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2002 |
| 1924 | Principle Petroleum LLC | Dallas, TX 75313 | Oil Operator | May 2025 |
| 1925 | Pringle Operating Co. | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2015 |
| 1926 | Pringle Resources, Inc. | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 1927 | Prior, Ferrell L | | Oil & Gas Operator | Dec 2021 |
| 1928 | Priority Energy LLC | Summerland, CA 93067 | Oil & Gas Operator | Apr 2016 |
| 1929 | Priority Holdings LLC | Marlow, OK 73055 | Oil Operator | Nov 2025 |
| 1930 | Priority Oil & Gas LLC | Lakewood, CO 80227 | Gas Operator | Dec 2019 |
| 1931 | Priority Oil Company LLC | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 1932 | Priority Production, LLC | | Gas Operator | Dec 2021 |
| 1933 | Prisum Ventures | | Oil & Gas Operator | Oct 1995 |
| 1934 | Pritchard Engineering | | Oil & Gas Operator | Mar 1989 |
| 1935 | Pritz Maurice G | | Oil Operator | Oct 1990 |
| 1936 | Privateer Energy LLC | Warren, NJ 07059 | Oil Operator | Feb 2026 |
| 1937 | Prize Exploration & Prod, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 1938 | Prize Exploration, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 1939 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 1940 | Pro NM Energy Inc | Santa Fe, NM 87508 | Oil & Gas Operator | Oct 2015 |
| 1941 | Pro Oil & Gas Inc | Frankfort, IL 60423 | Oil & Gas Operator | May 2014 |
| 1942 | Pro- Gas, Inc. | Midland, TX 79711 | Oil & Gas Operator | Feb 2026 |
| 1943 | Pro-Energy Inc | Tulsa, OK 74136-5925 | Oil Operator | Nov 2025 |
| 1944 | Pro-Test, Inc. | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 1945 | Pro. Energy I Resource, LLC | Haslet, TX 76052 | Oil Operator | Feb 2026 |
| 1946 | Pro3 Sulfur Solutions, Inc. | Russell, KS 67665 | Oil Operator | Aug 2025 |
| 1947 | Probe Exploration Company | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 1948 | Probe Offshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 1949 | Probe Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jul 2016 |
| 1950 | Probity Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Jul 2014 |
| 1951 | Procell & Procell | | Oil & Gas Operator | Jan 2003 |
| 1952 | Procell Oil & Gas | | Oil & Gas Operator | Nov 2000 |
| 1953 | Proco | Wooster, OH 44691 | Oil Operator | Dec 1988 |
| 1954 | Proco Operating Co., Inc. | Graford, TX 76449 | Oil & Gas Operator | Feb 2026 |
| 1955 | Proctor Dale & Mildred | Wetumka, OK 74883-6272 | Gas Operator | Nov 2025 |
| 1956 | Producers Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 2000 |
| 1957 | Producers Engineering Company | Destin, FL 32541 | Oil & Gas Operator | Sep 1999 |
| 1958 | Producers Environmental Ser. Inc | Borger, TX 79008 | Oil & Gas Operator | Feb 2026 |
| 1959 | Producers Equipm | | Oil Operator | Dec 1996 |
| 1960 | Producers Gas Transmission Inc | | Oil Operator | Nov 2024 |
| 1961 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 1962 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2026 |
| 1963 | Producers Well Service, Inc. | Boling, TX 77420 | Oil & Gas Operator | Feb 2026 |
| 1964 | Producing Royalties Inc | Lubbock, TX BADADDR | Gas Operator | Aug 2004 |
| 1965 | Production Compa | | Oil Operator | Apr 1985 |
| 1966 | Production Consultants, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Feb 2017 |
| 1967 | Production Disbursement, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2011 |
| 1968 | Production Drill | | Oil Operator | Oct 1994 |
| 1969 | Production Drilling, Inc. | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 1970 | Production Funds Inc | | Oil & Gas Operator | Nov 2001 |
| 1971 | Production Gathering Company, LP | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 1972 | Production Gauging Service Inc | | Oil Operator | Feb 1999 |
| 1973 | Production Incor | | Gas Operator | Feb 1987 |
| 1974 | Production Maintenance Service | | Oil & Gas Operator | Jun 2020 |
| 1975 | Production Manag | | Oil Operator | Dec 1986 |
| 1976 | Production Management Associates | Plano, TX 75075 | Oil & Gas Operator | Feb 2026 |
| 1977 | Production Management Corp. | | Oil & Gas Operator | Jul 1987 |
| 1978 | Production Management Inc | | Oil & Gas Operator | Oct 2006 |
| 1979 | Production Marketing Assoc Inc | Plano, TX 75075 | Oil & Gas Operator | Feb 2026 |
| 1980 | Production Operators Of TX, LLC | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 1981 | Production Resources, Inc. | Castroville, TX 78009 | Oil & Gas Operator | Feb 2026 |
| 1982 | Production Service Co. | Lubbock, TX 79490 | Oil & Gas Operator | Oct 2015 |
| 1983 | Production Specialties Company | | Oil & Gas Operator | Dec 2003 |
| 1984 | Production Team | | Oil & Gas Operator | Sep 1991 |
| 1985 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Feb 2026 |
| 1986 | Professional Management GRP,Inc. | Boerne, TX 78006 | Oil & Gas Operator | Aug 1999 |
| 1987 | Professional Management Serv | | Oil Operator | Mar 1991 |
| 1988 | Professional Oilfield Services, Inc. | Byesville, OH 43723 | Oil & Gas Operator | Dec 2021 |
| 1989 | Professional Petr. Servs, Inc. | | Oil Operator | Oct 2016 |
| 1990 | Professional Petroleum Services, Inc. | | Gas Operator | Nov 1997 |
| 1991 | Profit Energy Company | Jerusalem, OH 43747 | Oil & Gas Operator | Dec 2024 |
| 1992 | Progas Operating, Inc | Red Rock, TX 78662 | Oil & Gas Operator | Feb 2026 |
| 1993 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2026 |
| 1994 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 1995 | Progress Petroleum Co. | | Oil & Gas Operator | Apr 1993 |
| 1996 | Progressive Gas Services Inc. | Houston, TX 77279 | Oil & Gas Operator | Feb 2002 |
| 1997 | Progressive Oil & Gas | Moxahala, OH 43761 | Oil & Gas Operator | Dec 2024 |
| 1998 | Project Design Specialists Inc | | Oil & Gas Operator | May 1991 |
| 1999 | Projj Energy LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Feb 2026 |
| 2000 | Prolific Resources LLC | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |