| 1901 | Professional Management Serv | | Oil Operator | Mar 1991 |
| 1902 | Professional Oilfield Services, Inc. | Byesville, OH 43723 | Oil & Gas Operator | Dec 2021 |
| 1903 | Professional Petr. Servs, Inc. | | Oil Operator | Oct 2016 |
| 1904 | Profit Energy Company | Jerusalem, OH 43747 | Oil & Gas Operator | Dec 2023 |
| 1905 | Progas Operating, Inc | Red Rock, TX 78662 | Oil & Gas Operator | Dec 2024 |
| 1906 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2024 |
| 1907 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 1908 | Progress Petroleum Co. | | Oil & Gas Operator | Apr 1993 |
| 1909 | Progressive Gas Services Inc. | Houston, TX 77279 | Oil & Gas Operator | Feb 2002 |
| 1910 | Progressive Oil & Gas | Moxahala, OH 43761 | Oil & Gas Operator | Dec 2023 |
| 1911 | Projj Energy LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Dec 2024 |
| 1912 | Prolific Resources LLC | Wichita, KS 67208 | Oil & Gas Operator | Jul 2024 |
| 1913 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Dec 2024 |
| 1914 | Prolithic Energy Company, L.P. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2002 |
| 1915 | Promise Energy Operations, LLC | Texas City, TX 77592 | Oil Operator | Dec 2024 |
| 1916 | Prompt Operating LLC | Velma, OK 73491 | Oil Operator | Aug 2024 |
| 1917 | Pronghorn Management Corporation | Hobbs, NM 88241 | Oil & Gas Operator | Dec 2024 |
| 1918 | Pronghorn Operating LLC | | Oil Operator | Jan 2023 |
| 1919 | Pronto Services | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2024 |
| 1920 | Propel Energy Company | | Oil Operator | Oct 1991 |
| 1921 | Propel Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2013 |
| 1922 | Property Development Group, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2024 |
| 1923 | Property Producing Co. | Columbus, TX 78934 | Gas Operator | Dec 2024 |
| 1924 | Prospctv Invstmnt & TRDG Co, LTD | Tulsa, OK 74170 | Oil & Gas Operator | May 2001 |
| 1925 | Prospect Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 1926 | Prospect Enterprises Inc | Wetumka, OK 74883-0068 | Oil & Gas Operator | Apr 2004 |
| 1927 | Prospect Oil & G | | Oil Operator | Feb 1996 |
| 1928 | Prospect Oil & Gas Corp | Russell, KS 67665 | Oil Operator | Jul 2024 |
| 1929 | Prospecta Energy Group, Inc. | Brownwood, TX 76801 | Oil Operator | Dec 2024 |
| 1930 | Prospective Inv. & Trading Co., LTD., The | Tulsa, OK 74170 | Oil Operator | Dec 2019 |
| 1931 | Prospective Invest & Trad Co LTD | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2005 |
| 1932 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 1933 | Prospective Investment & Trading Co., LTD., The | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 1934 | Prospective Investment & Trding Co LTD | | Oil & Gas Operator | Aug 2012 |
| 1935 | Prospective Investment And Trading Co (The) | Tulsa, OK 741702320 | Oil & Gas Operator | Jun 2005 |
| 1936 | Prospective Invs | | Oil & Gas Operator | Jun 1994 |
| 1937 | Prospectors LTD., The | Somerset, TX 78069 | Oil & Gas Operator | Jun 2002 |
| 1938 | Prosper Energy Corporation | | Oil & Gas Operator | Oct 1988 |
| 1939 | Prosper Oil & Gas,Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 1940 | Prospera Energy, Inc. | | Oil & Gas Operator | Dec 2005 |
| 1941 | Prosperous Oil & Gas Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Aug 2024 |
| 1942 | Prostar Energy, LLC | | Oil Operator | Sep 2011 |
| 1943 | Protege Energy III LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 1944 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 1945 | Proteus Petroleum, Inc. | | Oil & Gas Operator | Nov 1983 |
| 1946 | Protho Energy Service LLC | | Oil & Gas Operator | Sep 2024 |
| 1947 | Proton Energy, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |
| 1948 | Prough A J | Gotebo, OK 73041 | Oil Operator | Apr 2014 |
| 1949 | Provecho Partners | Hays, KS 67601 | Oil Operator | Apr 2005 |
| 1950 | Proven Fuel Exploration, Inc. | | Oil & Gas Operator | Mar 2022 |
| 1951 | Proven Natural Resources LLC | Rockwall, TX 75032 | Oil & Gas Operator | Dec 2024 |
| 1952 | Proven Oil Production | | Oil Operator | Mar 2002 |
| 1953 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Sep 2024 |
| 1954 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Sep 2024 |
| 1955 | Providence Energ | | Oil & Gas Operator | Jul 1988 |
| 1956 | Providence Energy Corporation | Broken Arrow, OK 74013-3783 | Oil & Gas Operator | Feb 1994 |
| 1957 | Providence Energy Servs Inc.-Kelton Op Corp | Andrews, TX 79714 | Oil & Gas Operator | Sep 2024 |
| 1958 | Providence Exploration & Production | | Gas Operator | Jan 2006 |
| 1959 | Providence Exploration & Production Inc | Fort Smith, AR 72913-5171 | Gas Operator | Dec 2012 |
| 1960 | Providence Oil & Gas Corp | Tulsa, OK 74135-5463 | Oil & Gas Operator | May 2005 |
| 1961 | Providence Oil Prod. | Freer, TX 78357 | Oil & Gas Operator | Dec 2024 |
| 1962 | Providence Operating LLC Dba Poco Operating | | Oil & Gas Operator | Sep 2024 |
| 1963 | Provident Energy Of Montana, LLC | Cut Bank, MT 59427 | Oil Operator | Aug 2024 |
| 1964 | Provident Oil & Gas Co | Akron, OH 44313 | Oil & Gas Operator | Dec 1989 |
| 1965 | Provident Oil & Gas Corp | Akron, OH 44333 | Oil & Gas Operator | Dec 1991 |
| 1966 | Provident Resources LTD | | Oil & Gas Operator | Dec 1986 |
| 1967 | Provine, B.R. | Wichita, KS 67226 | Oil Operator | Apr 2010 |
| 1968 | Prudent Resources LLC | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 1969 | Prudential Oil & Gas, Inc. | | Oil & Gas Operator | Jul 1987 |
| 1970 | Prudential Petroleum Co., LTD. | | Oil & Gas Operator | Dec 1990 |
| 1971 | Pruet & Hughes | | Oil & Gas Operator | Jul 1977 |
| 1972 | Pruet & Hughes Co. | | Oil & Gas Operator | Jan 1978 |
| 1973 | Pruet & Hughes Operating Co. | | Oil & Gas Operator | May 1981 |
| 1974 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Sep 2024 |
| 1975 | Pruet Production Co. & Moon & Hines | | Oil & Gas Operator | Jun 2013 |
| 1976 | Pruet Production Co.-Midroc Oper. Co. & Watkins, H. Vaughan,Jr. | | Oil & Gas Operator | Sep 1994 |
| 1977 | Pruett, Cecil | Borger, TX 79008 | Oil & Gas Operator | Aug 2003 |
| 1978 | Pruitt Engineering & Petro. Co. | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2007 |
| 1979 | Pruitt Oil & Gas | Decatur, TX 76234 | Oil & Gas Operator | Feb 2018 |
| 1980 | Pruitt Operating Company LLC | Ratliff City, OK 73481-5802 | Oil & Gas Operator | Sep 2024 |
| 1981 | Pruitt Tool Gas Department | | Gas Operator | Jan 2008 |
| 1982 | Pruitt, Cecil, Jr. | Chantilly, VA 22021-2105 | Oil & Gas Operator | Dec 2014 |
| 1983 | Prusack, James | Grantsville, WV 26147-0180 | Oil & Gas Operator | Dec 2021 |
| 1984 | Pryme Energy, LLC | | Oil & Gas Operator | Feb 2015 |
| 1985 | Pryor Oil Compan | | Oil & Gas Operator | Nov 1994 |
| 1986 | Pryor Petroleum Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 1987 | Pryor, Curtis | Lubbock, TX 79424 | Oil & Gas Operator | Dec 1998 |
| 1988 | Pryor, VIctor W., Jr. | Holdenville, OK 74848 | Oil & Gas Operator | Apr 2017 |
| 1989 | PS126 Investments LLC | | Oil & Gas Operator | Sep 2024 |
| 1990 | Psa Inc | Chandler, OK 74834-4222 | Oil & Gas Operator | Aug 2024 |
| 1991 | Psa Producers | Hobbs, NM 88241 | Oil & Gas Operator | Jun 1995 |
| 1992 | PSC Industrial Outsourcing, LP | | Oil Operator | Jul 2024 |
| 1993 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 1994 | Psi Production, Inc. | Tyler, TX 75702 | Gas Operator | Jan 1994 |
| 1995 | PSP Operating, Inc. | Lubbock, TX 79413 | Oil & Gas Operator | Jun 1999 |
| 1996 | PT II LTD | | Oil & Gas Operator | Oct 2004 |
| 1997 | PT Oil LLC | Osage City, KS 66523 | Oil & Gas Operator | Jul 2024 |
| 1998 | PT Petroleum, LLC | Argyle, TX 76226 | Oil & Gas Operator | Oct 2019 |
| 1999 | Ptarmigan Inc | Leavenworth, KS 66048 | Oil Operator | Nov 2009 |
| 2000 | Pubco Petroleum Corp | Albuquerque, NM 87104 | Oil & Gas Operator | Dec 1981 |