| 1001 | Petroleum Development Cor | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2004 |
| 1002 | Petroleum Development Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 1003 | Petroleum Development LLC | | Oil Operator | Jul 2018 |
| 1004 | Petroleum Energy | | Oil & Gas Operator | Mar 1991 |
| 1005 | Petroleum Energy Corp | | Oil & Gas Operator | Jul 2012 |
| 1006 | Petroleum Energy, Inc. | Wichita, KS 67202 | Oil Operator | May 1999 |
| 1007 | Petroleum Engineering & Management Corp. | Casper, WY 82609 | Oil & Gas Operator | Jul 2018 |
| 1008 | Petroleum Engineers, Inc. | | Oil & Gas Operator | Jun 1983 |
| 1009 | Petroleum Enterp | | Oil & Gas Operator | Sep 1995 |
| 1010 | Petroleum Enterprises, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | May 2001 |
| 1011 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 1012 | Petroleum Explo Prod Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2017 |
| 1013 | Petroleum Explor | | Oil Operator | Aug 1983 |
| 1014 | Petroleum Exploration Co | | Oil Operator | Dec 2024 |
| 1015 | Petroleum Exploration Company LTD Dba Petex | | Oil & Gas Operator | Jan 2026 |
| 1016 | Petroleum Exploration Company LTD LP | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 1017 | Petroleum Exploration Company LTD., Limited | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 1018 | Petroleum Futures-Chapman Oil | | Oil & Gas Operator | Jul 1981 |
| 1019 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 1020 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 1021 | Petroleum International, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2000 |
| 1022 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 1023 | Petroleum Investments, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Dec 1977 |
| 1024 | Petroleum Land Company | Abilene, TX 79606 | Oil & Gas Operator | May 2000 |
| 1025 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 1026 | Petroleum Management Int'L, Inc. | Sugar Land, TX 77487 | Oil & Gas Operator | Oct 1993 |
| 1027 | Petroleum Management LLC | Platteville, CO 80651 | Oil & Gas Operator | Mar 2011 |
| 1028 | Petroleum Management Prof Inc | Oklahoma City, OK 73120-1848 | Oil & Gas Operator | Apr 2009 |
| 1029 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Apr 2026 |
| 1030 | Petroleum Prod. MGMT | | Oil Operator | Nov 1995 |
| 1031 | Petroleum Produc | | Oil & Gas Operator | Dec 1996 |
| 1032 | Petroleum Production Corporation | Rantoul, KS 66079 | Oil Operator | Feb 2024 |
| 1033 | Petroleum Production Engineering | Fulton, TX 78358 | Oil Operator | Feb 2019 |
| 1034 | Petroleum Production Management Inc | Shawnee Mission, KS 66202 | Oil & Gas Operator | Nov 2021 |
| 1035 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Apr 2026 |
| 1036 | Petroleum Products Inc | | Oil Operator | Jun 1996 |
| 1037 | Petroleum Proper | | Oil & Gas Operator | Nov 1995 |
| 1038 | Petroleum Properties Co Inc | Tulsa, OK 74132-4010 | Oil & Gas Operator | Sep 2012 |
| 1039 | Petroleum Properties MGMT Co LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2005 |
| 1040 | Petroleum Properties MGMT Corp | | Oil & Gas Operator | Aug 1990 |
| 1041 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 1042 | Petroleum Property MGMT, Inc (A) | Fort Worth, TX 76101 | Oil & Gas Operator | May 1994 |
| 1043 | Petroleum Property Services, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 1044 | Petroleum Recovery & Expl Inc. | | Oil Operator | Oct 1984 |
| 1045 | Petroleum Recovery Systems, L.C. | Houston, TX 77024 | Oil Operator | Apr 2026 |
| 1046 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 1047 | Petroleum Resource Management Co | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 1048 | Petroleum Resource Management Corp | Denver, CO 80203 | Oil & Gas Operator | Jan 2026 |
| 1049 | Petroleum Resource MGMT Co TX | | Oil & Gas Operator | Sep 2020 |
| 1050 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 1051 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 1052 | Petroleum Resources, LLC | | Oil & Gas Operator | Dec 2021 |
| 1053 | Petroleum Service Partners, Inc. | Indiana, PA 15701-0000 | Oil & Gas Operator | Dec 2021 |
| 1054 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 1055 | Petroleum Techno | | Oil & Gas Operator | Dec 1996 |
| 1056 | Petroleum Technologies, Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Dec 2025 |
| 1057 | Petroleum Venture Capitol Corp | | Oil Operator | Jun 1980 |
| 1058 | Petroleum Well Service LLC | Silsbee, TX 77656 | Oil Operator | Apr 2026 |
| 1059 | Petrolia Energy Corporation | Pearland, TX 77581 | Oil Operator | Jan 2024 |
| 1060 | Petrolia Group, L.L.C. | Katy, TX 77449 | Oil & Gas Operator | Apr 2026 |
| 1061 | Petromac, Inc. | Onalaska, TX 77360 | Oil & Gas Operator | Apr 2026 |
| 1062 | Petromark Energy LLC | Oklahoma City, OK 73116-7634 | Oil & Gas Operator | Jun 2000 |
| 1063 | Petromark Resources Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1993 |
| 1064 | Petromax Oil And Gas Inc | | Oil & Gas Operator | Dec 1988 |
| 1065 | Petromerica Operating LLC | Oklahoma City, OK 73102-4613 | Oil Operator | Feb 2026 |
| 1066 | Petrominerals Corp. | | Oil & Gas Operator | Dec 2003 |
| 1067 | Petromining, Inc. | Plano, TX 75026 | Oil & Gas Operator | Apr 2026 |
| 1068 | Petron Development Company | | Oil & Gas Operator | Sep 2020 |
| 1069 | Petron Energy Inc | Dallas, TX 75252 | Oil & Gas Operator | Apr 2026 |
| 1070 | Petron Oil Company | Missouri City, TX 77489 | Oil & Gas Operator | Apr 2026 |
| 1071 | Petronomics Petroleum, Inc. | Austin, TX 78734 | Oil & Gas Operator | Jan 1995 |
| 1072 | Petronomics, Inc. | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 1073 | Petronova, LLC | | Gas Operator | Jul 2014 |
| 1074 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 1075 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 1076 | Petropoint Energy Operating, LLC | Houston, TX 77098 | Oil & Gas Operator | Apr 2026 |
| 1077 | Petroprize | | Oil & Gas Operator | Dec 2025 |
| 1078 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 1079 | Petropro Petroleum LLC | | Oil Operator | Dec 2025 |
| 1080 | Petroquest Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2001 |
| 1081 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Apr 2026 |
| 1082 | Petroquest Exploration, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2008 |
| 1083 | Petroquest Oil & Gas LLC | Wewoka, OK 74884 | Oil & Gas Operator | Jan 2026 |
| 1084 | Petroquest, LLC | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 1085 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | Apr 2026 |
| 1086 | Petrorep Inc | | Oil Operator | Oct 1998 |
| 1087 | Petrosantander (USA) Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2025 |
| 1088 | Petrosaurus, Inc. | Somerset, TX 78069 | Oil Operator | Apr 2026 |
| 1089 | Petrosearch Operating Co, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 1090 | Petroshale (Us) Inc. | | Oil & Gas Operator | Feb 2026 |
| 1091 | Petroshare Corporation | | Oil & Gas Operator | Jan 2024 |
| 1092 | Petrosil Resources Inc. | | Oil & Gas Operator | Oct 1981 |
| 1093 | Petrosource Energy Corporation | Fort Worth, TX 76112 | Oil & Gas Operator | Apr 2026 |
| 1094 | Petrosource Production Co. L.P. | Midland, TX 79701 | Oil & Gas Operator | Nov 2007 |
| 1095 | Petrosource Production Co., LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 1096 | Petrotech Resources Corp | Glasgow, KY 42141 | Oil & Gas Operator | Dec 2024 |
| 1097 | Petrotex Engineering Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2026 |
| 1098 | Petrotex Louisiana Company | | Oil & Gas Operator | Aug 1998 |
| 1099 | Petrotex, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 1100 | Petrotx Operating, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2026 |