| 7901 | Den-Kay Corp. | Plano, TX 75074 | Oil Operator | Aug 2009 |
| 7902 | Denali Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Nov 2018 |
| 7903 | Denali Oil & Gas Management LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |
| 7904 | Denali Petroleum, LLC | Arlington, TX 76006 | Oil Operator | Mar 2021 |
| 7905 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 7906 | Denbury Offshore, Inc. | | Oil & Gas Operator | Nov 2004 |
| 7907 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 7908 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 7909 | Denchfield, Fred | Neal, KS 66863 | Oil Operator | Dec 1997 |
| 7910 | Denex Petroleum Corp. | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 7911 | Denex, Inc. | | Oil & Gas Operator | Jul 1983 |
| 7912 | Denham Danny D | Kellyville, OK 74039 | Oil & Gas Operator | Oct 2025 |
| 7913 | Denham Operating Company | Tulsa, OK 74101-3627 | Oil & Gas Operator | Aug 2022 |
| 7914 | Denhart & Denhart | Brownwood, TX 76804 | Oil & Gas Operator | Dec 2001 |
| 7915 | Deni Frank R | | Oil Operator | Dec 2022 |
| 7916 | Denis Roberts Oil | | Oil Operator | May 2025 |
| 7917 | Denman J M Oil C | | Oil Operator | Mar 1994 |
| 7918 | Denman-Friesen Co. | Lufkin, TX 75901 | Oil & Gas Operator | Nov 2006 |
| 7919 | Denmark Oil | Wichita, KS 67212 | Oil & Gas Operator | May 2000 |
| 7920 | Dennett'S Inc | Enid, OK 73701-1851 | Oil & Gas Operator | Apr 2014 |
| 7921 | Denney Don | Citrus Heights, CA 95611-2473 | Oil Operator | Aug 2023 |
| 7922 | Dennis & Broun | Bullard, TX 75757 | Oil & Gas Operator | Sep 2003 |
| 7923 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 7924 | Dennis Don Oil Company | Grady, OK 73569-9998 | Oil Operator | Jan 2002 |
| 7925 | Dennis Fitzpatrick Rev. Trust | Sterling, KS 67579 | Gas Operator | Jun 2025 |
| 7926 | Dennis Langlitz | Carlsbad, NM 88220 | Oil Operator | Jul 2009 |
| 7927 | Dennis Lloyd D | Fleming, OH 45729 | Oil & Gas Operator | Dec 2024 |
| 7928 | Dennis Oil & Gas LLC | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 7929 | Dennis, Don | Grady, OK 73545 | Oil & Gas Operator | Mar 1998 |
| 7930 | Dennison George | Tulsa, OK 74112-6732 | Oil & Gas Operator | Apr 2020 |
| 7931 | Denny'S Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2000 |
| 7932 | Denny, Arthur Gene | Independence, KS 67301 | Oil Operator | Oct 1996 |
| 7933 | Denoco Inc. | Plano, TX 75086 | Oil & Gas Operator | Mar 2008 |
| 7934 | Denova | | Oil Operator | Jan 1989 |
| 7935 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 7936 | Denpac Corporation | Colorado SPGS, CO 80922 | Oil & Gas Operator | Dec 2025 |
| 7937 | Densmore, Winfield F. Densmore, Debra L. | Lakewood, NY 14750 | Gas Operator | Dec 2024 |
| 7938 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 7939 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 7940 | Denton Oil & Gas | Argyle, TX 76226 | Oil Operator | Dec 2014 |
| 7941 | Denver Energy Exploration,LLC | Canyon Lake, TX 78133 | Oil Operator | Dec 2025 |
| 7942 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 7943 | Denveramerican Petroleum, A LTD Liability Co | Denver, CO 80203 | Oil & Gas Operator | Sep 1997 |
| 7944 | Department Of Conservation | | Oil Operator | Dec 2005 |
| 7945 | Department Of Energy | Casper, WY 82601 | Oil & Gas Operator | Jan 2015 |
| 7946 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 7947 | Depco, Inc. & Texas Pacific Oil Co. | | Oil Operator | Jul 1995 |
| 7948 | Depriest, Howard Joseph & Susan M. | East Aurora, NY 14052 | Gas Operator | Dec 2024 |
| 7949 | Depuy Drilling Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 7950 | Derae Oil Company | Seminole, OK 74868-2617 | Oil & Gas Operator | Feb 1997 |
| 7951 | Deran Resources, Inc. | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 7952 | Derby Exploration LLC | Okc, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 7953 | Derby Oil & Gas Corp | Cumberland, OH 43732 | Oil & Gas Operator | Dec 1986 |
| 7954 | Derby Oil Of Texas | Ventura, CA 93003 | Oil & Gas Operator | May 1996 |
| 7955 | Derby Operating Corp | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 7956 | Dernick Resources Inc | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 7957 | Derrick Exploration, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jan 2003 |
| 7958 | Derrick Oil & Gas, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Aug 2003 |
| 7959 | Derrick Petroleu | | Oil Operator | Sep 1994 |
| 7960 | Derrick Petroleum Inc | Bladensburg, OH 43005 | Oil & Gas Operator | Dec 2024 |
| 7961 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Sep 2025 |
| 7962 | Derrick-Amer Oil | | Oil Operator | Dec 1991 |
| 7963 | Derwen Operating Company | Houston, TX 77098 | Gas Operator | Dec 2009 |
| 7964 | Des Oil Inc/Osage Only | | Oil Operator | Nov 1998 |
| 7965 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 7966 | Desco Corp | Columbus, OH 43085 | Oil & Gas Operator | Dec 1989 |
| 7967 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 7968 | Desco-Medders | | Oil & Gas Operator | Jun 1984 |
| 7969 | Desert Eagle Operating LLC | | Gas Operator | Oct 2025 |
| 7970 | Desert Mountain Energy Corp. | Carson, NV 89701 | Gas Operator | Sep 2025 |
| 7971 | Desert Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 7972 | Desert States Energy, Inc. | Hobbs, NM 88240 | Oil & Gas Operator | Aug 1995 |
| 7973 | Deshal Energy LLC | Oklahoma City, OK 73170 | Oil Operator | Apr 2025 |
| 7974 | Deshazo Production Company | Dewey, OK 74029-2811 | Oil & Gas Operator | Nov 2005 |
| 7975 | Deshields Gary | Atwood, OK 74827 | Oil Operator | Aug 2025 |
| 7976 | Deshields Oil & Gas Inc | Okemah, OK 74859-9612 | Oil & Gas Operator | Sep 2014 |
| 7977 | Desoto Gas Corporation | | Oil & Gas Operator | Oct 1986 |
| 7978 | Desoto Gas Prod Co Inc-Zadeck | | Gas Operator | Jan 1990 |
| 7979 | Desoto Gas Producing Co. Inc | | Oil & Gas Operator | Jan 1990 |
| 7980 | Desoto Oil & Gas Corporation | | Oil & Gas Operator | Dec 1990 |
| 7981 | Desperation Oil & Gas Co. | | Gas Operator | Jan 1989 |
| 7982 | Despot Expl. Inc-Serio Expl Co | | Oil & Gas Operator | Apr 1990 |
| 7983 | Despot Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 7984 | Despot Production Company | | Oil & Gas Operator | May 1983 |
| 7985 | Despot, Inc. | | Oil & Gas Operator | Mar 1983 |
| 7986 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 7987 | Destin Operating Company, Inc. | | Oil & Gas Operator | Jan 2023 |
| 7988 | Destin Resources LLC | | Gas Operator | Jul 2018 |
| 7989 | Destiny Inc | Sprankle Mills, PA 15776-9705 | Gas Operator | Dec 2009 |
| 7990 | Destiny Petroleum LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2024 |
| 7991 | Destiny Services LLC | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 7992 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 7993 | Deuble, Adam And Misty Pennington | Jamestown, NY 14701 | Gas Operator | Dec 2024 |
| 7994 | Deuel Arch W | | Oil & Gas Operator | Aug 1995 |
| 7995 | Deuel Pet. Co. Inc. | | Oil & Gas Operator | Dec 2005 |
| 7996 | Deuel Petroleum Calif. Inc. | | Oil & Gas Operator | Dec 2001 |
| 7997 | Deuel Petroleum Company Inc. | | Oil & Gas Operator | Dec 1999 |
| 7998 | Deutsch Oil Comp | | Oil & Gas Operator | Oct 1994 |
| 7999 | Deutsch Oil Company | | Oil & Gas Operator | Jun 2025 |
| 8000 | Deutscher Oil Operations | | Oil Operator | Jun 2025 |