| 21101 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 21102 | Oxley Petroleum Company | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 21103 | Oxson Co. | Uvalde, TX 78802 | Gas Operator | Sep 2024 |
| 21104 | Oxtex Inc | | Oil & Gas Operator | Oct 1989 |
| 21105 | Oxxn | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2023 |
| 21106 | Oxy Little Knife, LLC | | Oil & Gas Operator | Jan 2016 |
| 21107 | Oxy Long Beach, Inc. | | Oil & Gas Operator | Dec 2014 |
| 21108 | Oxy Petroleum Inc | | Oil & Gas Operator | Jan 1986 |
| 21109 | Oxy USA | | Oil Operator | Apr 1992 |
| 21110 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Sep 2024 |
| 21111 | Oxy USA WTP Limited Partnership | Houston, TX 772104294 | Oil & Gas Operator | Jun 2024 |
| 21112 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Sep 2024 |
| 21113 | Oz Gas Corporation | Austin, TX 78746 | Gas Operator | Sep 2024 |
| 21114 | Oz Gas LTD | Tidioute, PA 16351-2648 | Oil & Gas Operator | Dec 2016 |
| 21115 | Ozark Enterprise | | Oil Operator | Nov 1990 |
| 21116 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Sep 2024 |
| 21117 | Ozark Gas Gathering LLC | Fort Smith, AR 72916 | Oil & Gas Operator | Jun 2024 |
| 21118 | Ozark Oil & Gas, Inc | | Gas Operator | May 2018 |
| 21119 | Ozark Production Company, Inc. | | Oil & Gas Operator | Jan 2024 |
| 21120 | Oztx Oil & Gas, L.L.C. | Ozona, TX 76943 | Oil & Gas Operator | Sep 2024 |
| 21121 | Ozzo Corporation, The | Bedford, TX 76021 | Oil Operator | Sep 2024 |
| 21122 | P & A Oilfield Services, Inc. | | Oil & Gas Operator | Jan 1998 |
| 21123 | P & A Operating, Inc. | Houston, TX 77095 | Oil & Gas Operator | Sep 2024 |
| 21124 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 21125 | P & C Energy Co | Allegany, NY 14706-9615 | Oil Operator | Dec 2015 |
| 21126 | P & C Oil & Gas, Inc. | Linn, WV 26384 | Oil & Gas Operator | Dec 2021 |
| 21127 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Jul 2024 |
| 21128 | P & C Petroleum, LLC | Shawnee, KS 66226 | Oil Operator | Apr 2024 |
| 21129 | P & D Valentine Oil Co | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2018 |
| 21130 | P & E Oil | | Oil & Gas Operator | Dec 2023 |
| 21131 | P & H Construction Inc | Wewoka, OK 74884 | Oil & Gas Operator | Jun 2024 |
| 21132 | P & H Oil & Gas Inc | Stroud, OK 74079 | Oil & Gas Operator | Jul 2024 |
| 21133 | P & H Vacuum Service | | Oil & Gas Operator | Apr 2024 |
| 21134 | P & J Resources, Inc | | Oil & Gas Operator | Dec 2013 |
| 21135 | P & M Construction | Graham, TX 76450 | Oil & Gas Operator | Sep 2024 |
| 21136 | P & M Drilling Company Inc | Depew, OK 74028 | Oil & Gas Operator | Dec 2004 |
| 21137 | P & M Oil Company | Hays, KS 67601 | Oil & Gas Operator | Jun 2024 |
| 21138 | P & M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 21139 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 21140 | P & P Petroleum | Midland, TX 79706 | Oil & Gas Operator | Oct 2002 |
| 21141 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 21142 | P & R Oil Company | Post, TX 79356 | Oil & Gas Operator | Sep 2024 |
| 21143 | P & S Energy Inc | Mineral Ridge, OH 44440 | Oil & Gas Operator | Dec 2019 |
| 21144 | P & S Oil And Gas Corporation | | Gas Operator | Dec 1996 |
| 21145 | P & S Production LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2013 |
| 21146 | P & W Oil | Lakewood, CO 80215 | Oil Operator | Sep 1985 |
| 21147 | P & W Well Service Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2024 |
| 21148 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 21149 | P A Energy Inc | Calvin, OK 74531-0248 | Oil & Gas Operator | Apr 2020 |
| 21150 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 21151 | P F Beeler LLC | Norman, OK 73072-7522 | Oil & Gas Operator | Jul 2024 |
| 21152 | P I C Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2013 |
| 21153 | P J Oil Co. | | Oil Operator | May 2024 |
| 21154 | P K & L Oil Properties | Shawnee, OK 74802-0931 | Oil & Gas Operator | Mar 2001 |
| 21155 | P O & G Panhandle LP | Houston, TX 77057 | Oil & Gas Operator | Jun 2024 |
| 21156 | P P & G Oil | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2023 |
| 21157 | P T C, Inc | Raccoon, KY 41557 | Gas Operator | Dec 2022 |
| 21158 | P T Oil Co Inc | Walters, OK 73572-9505 | Oil Operator | Nov 2014 |
| 21159 | P&B Petroleum LLC | Miami, FL 33166 | Oil & Gas Operator | Sep 2024 |
| 21160 | P&F Operations, LLC | Thrall, TX 76578 | Oil Operator | Sep 2024 |
| 21161 | P&H Gas, LLC | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 21162 | P&P Industries, Inc. | Austin, TX 78737 | Oil & Gas Operator | Dec 2002 |
| 21163 | P,B&B Operating Inc. | Coleman, TX 76834 | Oil & Gas Operator | Sep 2024 |
| 21164 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |
| 21165 | P-2 Exploraton Co Inc | Pampa, TX 79065-2920 | Oil & Gas Operator | Jun 1996 |
| 21166 | P-2 Oil | Vernal, UT 84078 | Oil & Gas Operator | Jul 2000 |
| 21167 | P-K Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 21168 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2024 |
| 21169 | P-Tex Petroleum, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Nov 1999 |
| 21170 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 21171 | P. D. L. Services, Inc. | Paris, OH 44669 | Oil & Gas Operator | Dec 2020 |
| 21172 | P. G. Oil & Gas, LLC | Clarksburg, WV 26302-2512 | Oil & Gas Operator | Dec 2021 |
| 21173 | P. K. Smith | | Oil Operator | Mar 1997 |
| 21174 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 21175 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 21176 | P. S. & G., Incorporated | | Gas Operator | Aug 1983 |
| 21177 | P.B. Blue Dot Properties | Wexford, PA 15090 | Oil & Gas Operator | Sep 2024 |
| 21178 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 21179 | P.D.T. Drilling Limited Partnership | St Albans, WV 25177-0000 | Gas Operator | Dec 2021 |
| 21180 | P.I.D. Drilling Inc | Clyde, TX 79510 | Oil & Gas Operator | Sep 2024 |
| 21181 | P.M. Petroleum | | Oil Operator | Mar 1998 |
| 21182 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2024 |
| 21183 | P.O.S. Energy, Inc. | Buna, TX 77612 | Oil & Gas Operator | Sep 2024 |
| 21184 | P.R.F. Enterprises, LLC | Kurten, TX 77862 | Oil Operator | Sep 2024 |
| 21185 | P.R.P., Inc. | | Oil & Gas Operator | Jul 2024 |
| 21186 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | Sep 2024 |
| 21187 | P.T.L. Operating Co. | | Oil Operator | Jun 2003 |
| 21188 | P1 Energy, LLC | Katy, TX 77494 | Oil & Gas Operator | Sep 2024 |
| 21189 | P3 Production | | Oil Operator | Apr 2024 |
| 21190 | P4 Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2024 |
| 21191 | Pa DCNR State Parks Bur | Harrisburg, PA 17105-8551 | Gas Operator | Dec 2023 |
| 21192 | Pa Dep Ofc Oil & Gas MGMT | Harrisburg, PA 17105-8765 | Gas Operator | Dec 1990 |
| 21193 | Pa Gen Energy Co LLC | Warren, PA 16365-2510 | Oil & Gas Operator | Jul 2024 |
| 21194 | Pa Gen Energy Corp | Warren, PA 16365-2510 | Oil & Gas Operator | Dec 2002 |
| 21195 | Pa Land Holdings Corp | Waynesburg, PA 15370-3020 | Oil & Gas Operator | Dec 2011 |
| 21196 | Pa Mineral SVCS LLC | Indiana, PA 15701 | Oil & Gas Operator | Dec 2023 |
| 21197 | Pa Prod SVC Inc | Indiana, PA 15701-0421 | Oil & Gas Operator | Dec 2023 |
| 21198 | Pa Prospect LLC | Columbus, MT 59019 | Oil & Gas Operator | Jul 2020 |
| 21199 | Pa State Sys Of Higher Ed Indiana Univ | Indiana, PA 15705-0001 | Gas Operator | Dec 2012 |
| 21200 | Pablo Energy II, LLC | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2024 |