| 8001 | Dennis Don Oil Company | Grady, OK 73569-9998 | Oil Operator | Jan 2002 |
| 8002 | Dennis Fitzpatrick Rev. Trust | Sterling, KS 67579 | Gas Operator | Dec 2024 |
| 8003 | Dennis Langlitz | Carlsbad, NM 88220 | Oil Operator | Jul 2009 |
| 8004 | Dennis Lloyd D | Fleming, OH 45729 | Oil & Gas Operator | Dec 2024 |
| 8005 | Dennis Oil & Gas LLC | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 8006 | Dennis, Don | Grady, OK 73545 | Oil & Gas Operator | Mar 1998 |
| 8007 | Dennison George | Tulsa, OK 74112-6732 | Oil & Gas Operator | Apr 2020 |
| 8008 | Denny'S Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2000 |
| 8009 | Denny, Arthur Gene | Independence, KS 67301 | Oil Operator | Oct 1996 |
| 8010 | Denoco Inc. | Plano, TX 75086 | Oil & Gas Operator | Mar 2008 |
| 8011 | Denova | | Oil Operator | Jan 1989 |
| 8012 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 8013 | Denpac Corporation | Colorado SPGS, CO 80922 | Oil & Gas Operator | Apr 2025 |
| 8014 | Densmore, Winfield F. Densmore, Debra L. | Lakewood, NY 14750 | Gas Operator | Dec 2023 |
| 8015 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 8016 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 8017 | Denton Oil & Gas | Argyle, TX 76226 | Oil Operator | Dec 2014 |
| 8018 | Denver Energy Exploration,LLC | Canyon Lake, TX 78133 | Oil Operator | Apr 2025 |
| 8019 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 8020 | Denveramerican Petroleum, A LTD Liability Co | Denver, CO 80203 | Oil & Gas Operator | Sep 1997 |
| 8021 | Department Of Conservation | | Oil Operator | Dec 2005 |
| 8022 | Department Of Energy | Casper, WY 82601 | Oil & Gas Operator | Jan 2015 |
| 8023 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 8024 | Depco, Inc. & Texas Pacific Oil Co. | | Oil Operator | Jul 1995 |
| 8025 | Depew Union Free School District | Depew, NY 14043 | Gas Operator | Dec 2023 |
| 8026 | Depriest, Howard Joseph & Susan M. | East Aurora, NY 14052 | Gas Operator | Dec 2023 |
| 8027 | Depuy Drilling Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 8028 | Derae Oil Company | Seminole, OK 74868-2617 | Oil & Gas Operator | Feb 1997 |
| 8029 | Deran Resources, Inc. | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 8030 | Derby Exploration LLC | Okc, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 8031 | Derby Oil & Gas Corp | Cumberland, OH 43732 | Oil & Gas Operator | Dec 1986 |
| 8032 | Derby Oil Of Texas | Ventura, CA 93003 | Oil & Gas Operator | May 1996 |
| 8033 | Derby Operating Corp | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 8034 | Dernick Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 8035 | Derrick Exploration, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jan 2003 |
| 8036 | Derrick Oil & Gas, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Aug 2003 |
| 8037 | Derrick Petroleu | | Oil Operator | Sep 1994 |
| 8038 | Derrick Petroleum Inc | Bladensburg, OH 43005 | Oil & Gas Operator | Dec 2024 |
| 8039 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2025 |
| 8040 | Derrick-Amer Oil | | Oil Operator | Dec 1991 |
| 8041 | Derwen Operating Company | Houston, TX 77098 | Gas Operator | Dec 2009 |
| 8042 | Des Oil Incorporated | Sedan, KS 67361 | Oil Operator | Nov 1998 |
| 8043 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 8044 | Desco Corp | Columbus, OH 43085 | Oil & Gas Operator | Dec 1989 |
| 8045 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 8046 | Desco-Medders | | Oil & Gas Operator | Jun 1984 |
| 8047 | Desert Eagle Operating LLC | | Gas Operator | Feb 2025 |
| 8048 | Desert Mountain Energy Corp. | Carson, NV 89701 | Gas Operator | Feb 2025 |
| 8049 | Desert Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 8050 | Desert States Energy, Inc. | Hobbs, NM 88240 | Oil & Gas Operator | Aug 1995 |
| 8051 | Deshal Energy LLC | Oklahoma City, OK 73170 | Oil Operator | Oct 2024 |
| 8052 | Deshazo Production Company | Dewey, OK 74029-2811 | Oil & Gas Operator | Nov 2005 |
| 8053 | Deshields Gary | Atwood, OK 74827 | Oil Operator | Sep 2024 |
| 8054 | Deshields Oil & Gas Inc | Okemah, OK 74859-9612 | Oil & Gas Operator | Sep 2014 |
| 8055 | Desoto Gas Corporation | | Oil & Gas Operator | Oct 1986 |
| 8056 | Desoto Gas Prod Co Inc-Zadeck | | Gas Operator | Jan 1990 |
| 8057 | Desoto Gas Producing Co. Inc | | Oil & Gas Operator | Jan 1990 |
| 8058 | Desoto Oil & Gas Corporation | | Oil & Gas Operator | Dec 1990 |
| 8059 | Desperation Oil & Gas Co. | | Gas Operator | Jan 1989 |
| 8060 | Despot Expl. Inc-Serio Expl Co | | Oil & Gas Operator | Apr 1990 |
| 8061 | Despot Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 8062 | Despot Production Company | | Oil & Gas Operator | May 1983 |
| 8063 | Despot, Inc. | | Oil & Gas Operator | Mar 1983 |
| 8064 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 8065 | Destin Operating Company, Inc. | | Oil & Gas Operator | Jan 2023 |
| 8066 | Destin Resources LLC | | Gas Operator | Jul 2018 |
| 8067 | Destiny Inc | Sprankle Mills, PA 15776-9705 | Gas Operator | Dec 2009 |
| 8068 | Destiny Petroleum LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2024 |
| 8069 | Destiny Services LLC | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 8070 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 8071 | Deuble, Adam And Misty Pennington | Jamestown, NY 14701 | Gas Operator | Dec 2023 |
| 8072 | Deuel Arch W | | Oil & Gas Operator | Aug 1995 |
| 8073 | Deuel Pet. Co. Inc. | | Oil & Gas Operator | Dec 2005 |
| 8074 | Deuel Petroleum Calif. Inc. | | Oil & Gas Operator | Dec 2001 |
| 8075 | Deuel Petroleum Company Inc. | | Oil & Gas Operator | Dec 1999 |
| 8076 | Deutsch Oil Comp | | Oil & Gas Operator | Oct 1994 |
| 8077 | Deutsch Oil Company | | Oil & Gas Operator | Dec 2024 |
| 8078 | Deutscher Oil Operations | | Oil Operator | Oct 2024 |
| 8079 | Developed Resources Inc | Cheswick, PA 15024 | Oil & Gas Operator | Dec 2024 |
| 8080 | Development Ener | | Oil Operator | Dec 1994 |
| 8081 | Dever Lavon B | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2012 |
| 8082 | Dever Linda K | Norwalk, OH 43767 | Oil & Gas Operator | Dec 2024 |
| 8083 | Devilbiss Contracting, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Oct 2005 |
| 8084 | Devine, C. R., Inc. | Houston, TX 77292 | Oil & Gas Operator | Feb 2018 |
| 8085 | Devon Corporation | | Oil Operator | Oct 1981 |
| 8086 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 8087 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 8088 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 8089 | Devon Energy Operating Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2013 |
| 8090 | Devon Energy Production Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2015 |
| 8091 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 8092 | Devon Energy Williston, L.L.C. | Oklahoma City, OK 73102-8260 | Oil & Gas Operator | Feb 2025 |
| 8093 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 8094 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 8095 | Devon Petroleum Corp. | Marietta, OH 45750 | Oil & Gas Operator | Dec 1996 |
| 8096 | Devon Resources Corporation | Jenks, OK 74037-3525 | Oil & Gas Operator | Dec 2024 |
| 8097 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 8098 | Devonian Energy Inc | | Gas Operator | Feb 2025 |
| 8099 | Devonian Energy Inc And Muzyl Oil Corp | | Oil & Gas Operator | Aug 1999 |
| 8100 | Devonian Gas Production, Inc. | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |