| 101 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 102 | Pentagon Petroleum, Inc. | | Oil & Gas Operator | Sep 1991 |
| 103 | Penton And Penton | | Oil & Gas Operator | Jan 1983 |
| 104 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 105 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 106 | Perdura Energy L.L.C. | | Oil & Gas Operator | Apr 2018 |
| 107 | Perdure Petroleum LLC | Allen, TX 75013 | Oil & Gas Operator | Oct 2021 |
| 108 | Perenco LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 109 | Perkins Oil Properties | | Oil & Gas Operator | Nov 2024 |
| 110 | Permeator Corp. | | Oil Operator | Sep 1990 |
| 111 | Perna Oil & Gas LLC | | Oil & Gas Operator | Nov 2024 |
| 112 | Perry Point, Inc. | | Oil Operator | Mar 2022 |
| 113 | Pesco | | Oil & Gas Operator | Oct 1984 |
| 114 | Pete Caldwell Drilling Co.,Inc | | Oil & Gas Operator | Aug 1991 |
| 115 | Peter W. Herbst | | Gas Operator | Mar 1998 |
| 116 | Peterman-Sturlese Et Al | | Oil & Gas Operator | Sep 1987 |
| 117 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 118 | Petro "E", LLC | | Oil & Gas Operator | Feb 2010 |
| 119 | Petro Energy Inc | Farmington, NM 87499 | Oil & Gas Operator | Jul 2025 |
| 120 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 121 | Petro Ventures Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 122 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 123 | Petro-Assets Corporation | | Oil & Gas Operator | Feb 2000 |
| 124 | Petro-Can, Inc. | | Oil & Gas Operator | Apr 1998 |
| 125 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 126 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 127 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 128 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 129 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 130 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 131 | Petro-Management Inc | | Oil Operator | Dec 1998 |
| 132 | Petro-Search, Inc. | | Oil Operator | Jul 1992 |
| 133 | Petro-Ventures, Inc. - Miss. | | Oil & Gas Operator | Apr 2009 |
| 134 | Petrocana,Inc. | | Oil & Gas Operator | Aug 1993 |
| 135 | Petrocorp | | Oil & Gas Operator | Nov 1992 |
| 136 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 137 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 138 | Petrofunds, Inc & Sunny South | | Oil & Gas Operator | Feb 1984 |
| 139 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 140 | Petrofunds, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 141 | Petroglen Company, Inc. | | Oil & Gas Operator | Jul 1990 |
| 142 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 143 | Petrohawk Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |
| 144 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 145 | Petrol Industries, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Jun 2012 |
| 146 | Petroleum Capital, L.C. | Dallas, TX 75367 | Oil & Gas Operator | Dec 2025 |
| 147 | Petroleum Corp Of Delaware The | | Oil & Gas Operator | May 1991 |
| 148 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 149 | Petroleum Engineers, Inc. | | Oil & Gas Operator | Jun 1983 |
| 150 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 151 | Petroleum Futures-Chapman Oil | | Oil & Gas Operator | Jul 1981 |
| 152 | Petroleum Investments, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Dec 1977 |
| 153 | Petroleum Management Int'L, Inc. | Sugar Land, TX 77487 | Oil & Gas Operator | Oct 1993 |
| 154 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Dec 2025 |
| 155 | Petroleum Properties MGMT Corp | | Oil & Gas Operator | Aug 1990 |
| 156 | Petroleum Recovery & Expl Inc. | | Oil Operator | Oct 1984 |
| 157 | Petroleum Resource MGMT Co TX | | Oil & Gas Operator | Sep 2020 |
| 158 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 159 | Petroleum Venture Capitol Corp | | Oil Operator | Jun 1980 |
| 160 | Petromark Resources Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1993 |
| 161 | Petrominerals Corp. | | Oil & Gas Operator | Dec 2003 |
| 162 | Petroquest Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2001 |
| 163 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Dec 2025 |
| 164 | Petroquest Exploration, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2008 |
| 165 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | Dec 2025 |
| 166 | Petrosearch Operating Co, LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 167 | Petrosil Resources Inc. | | Oil & Gas Operator | Oct 1981 |
| 168 | Petrotex Engineering Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2025 |
| 169 | Petrotex Louisiana Company | | Oil & Gas Operator | Aug 1998 |
| 170 | Petrus Oil Company, L.P. | | Oil & Gas Operator | Dec 1989 |
| 171 | Petrus Operating Co., Inc. | | Oil & Gas Operator | Dec 1986 |
| 172 | Petsec Energy Inc. | | Oil & Gas Operator | Sep 2012 |
| 173 | PF Operating Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Aug 2003 |
| 174 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 175 | PG&E Resources Offshore Company | Dallas, TX 75206 | Oil & Gas Operator | Oct 1994 |
| 176 | Phalanx Petroleum LLC | | Oil & Gas Operator | Jan 2025 |
| 177 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 178 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Dec 2025 |
| 179 | Pharaoh Oil, LLC | | Oil Operator | Jan 2025 |
| 180 | Philip B. Berry Oper Co., Inc. | | Oil & Gas Operator | Jun 1990 |
| 181 | Philip Services/Louisiana Inc. | | Oil Operator | Dec 2000 |
| 182 | Phillberg Oil Company | | Oil Operator | Mar 2014 |
| 183 | Phillip A Guzzino | | Oil Operator | Jan 2000 |
| 184 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 185 | Phillips Lake Corp. | | Oil Operator | Dec 1985 |
| 186 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 187 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 188 | Phoenic Opr Co Inc-SPD | | Oil Operator | Feb 1993 |
| 189 | Phoenix - Comco, Inc. | | Oil Operator | Aug 2004 |
| 190 | Phoenix Drilling & Exploration | | Oil & Gas Operator | Jun 1982 |
| 191 | Phoenix Energy, Inc. | Oilmont, MT 59466 | Oil & Gas Operator | May 2025 |
| 192 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 193 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 194 | Phoenix Oper Co Inc-New Amer | | Oil Operator | Jul 1994 |
| 195 | Phoenix Operating Co. Of Texas | | Oil Operator | Jul 1995 |
| 196 | Phoenix Operating Company, Inc. | Shreveport, LA 71161 | Oil & Gas Operator | Mar 2015 |
| 197 | Phoenix Opr Co Inc - West End | | Oil Operator | Dec 1992 |
| 198 | Phoenix Opr Co Inc-Acc | | Oil Operator | Dec 1992 |
| 199 | Phoenix Opr Co Inc-Amsterdam | | Oil Operator | Nov 1994 |
| 200 | Phoenix Opr Co Inc-Broadway | | Oil Operator | Dec 1992 |