| 7901 | Del Petroleum Corporation | Dallas, TX 75219 | Oil & Gas Operator | Jan 2012 |
| 7902 | Del Rio Production Co. | Gainesville, TX 76240 | Oil Operator | Mar 2019 |
| 7903 | Del-Rio Resources Inc | Vernal, UT 84079 | Oil & Gas Operator | Jan 2018 |
| 7904 | Delaney Oil And Gas Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 7905 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 7906 | Delaware Dyche Corp. | Hutchinson, KS 67501 | Oil Operator | Jan 2010 |
| 7907 | Delaware Ecco Petroleum Inc. | Rockwall, TX 75087 | Oil & Gas Operator | Jul 2001 |
| 7908 | Delbert A. Dodson | | Oil Operator | Aug 2002 |
| 7909 | Delcar, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1995 |
| 7910 | Delco Operating Company LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 7911 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 7912 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Apr 2025 |
| 7913 | Delgado, Emil A | San Antonio, TX 78223 | Oil & Gas Operator | Sep 2016 |
| 7914 | Delhi Gas Pipeli | | Gas Operator | Aug 1998 |
| 7915 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 7916 | Delhi Pipeline | | Oil & Gas Operator | Sep 1999 |
| 7917 | Delhi-Taylor Oil Corp | | Oil & Gas Operator | Dec 1974 |
| 7918 | Delhi-Trading LLC | Durango, CO 81301 | Oil & Gas Operator | Feb 2025 |
| 7919 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 7920 | Dell-Ray Investments, Inc. | Nickerson, KS 67561 | Oil Operator | Dec 2019 |
| 7921 | Delmar Operating, Inc. | Houston, TX 77010 | Oil & Gas Operator | Oct 1996 |
| 7922 | Delone, M S | El Dorado, AR 71730 | Oil & Gas Operator | Jun 2024 |
| 7923 | Delong Oil & Gas Serv Inc | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 7924 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 7925 | Delong, Ralph S | | Oil & Gas Operator | Jul 2024 |
| 7926 | Delozier, Orval & Stevens, Floyd, A General Partnership | Dewey, OK 74029 | Oil Operator | Nov 2009 |
| 7927 | Delphi International, Inc. | Tulsa, OK 74104 | Oil Operator | Mar 2025 |
| 7928 | Delphi Oil And Gas LLC | Macomb, OK 74852 | Oil Operator | Jan 2025 |
| 7929 | Delphi Oil, Inc. | Delphi, IN 46923 | Oil & Gas Operator | Jan 2025 |
| 7930 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 7931 | Delta C02, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2021 |
| 7932 | Delta D Operations | Wilson, OK 73463 | Oil & Gas Operator | Jul 2014 |
| 7933 | Delta D Operations Inc | Ardmore, OK 73401-8678 | Oil & Gas Operator | Apr 2014 |
| 7934 | Delta Development Co. Inc. | | Oil & Gas Operator | Dec 1988 |
| 7935 | Delta Energy Resources, Inc. | | Oil & Gas Operator | Jun 1990 |
| 7936 | Delta Expl.& Development Corp. | | Oil & Gas Operator | Jan 2025 |
| 7937 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 7938 | Delta Exploration, LLC | Fredericksbrg, TX 78624 | Oil Operator | Apr 2025 |
| 7939 | Delta Hydrocarbons, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Sep 1997 |
| 7940 | Delta Natural Gas Co, Inc | Winchester, KY 40391 | Oil Operator | Dec 2023 |
| 7941 | Delta Oil | Holliday, TX 76366 | Oil & Gas Operator | Sep 2005 |
| 7942 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 7943 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 7944 | Delta Oil Co Inc | | Oil & Gas Operator | Oct 2023 |
| 7945 | Delta Oil Co Inc And Great Lakes Niagaran | | Oil & Gas Operator | Dec 1987 |
| 7946 | Delta Oil Corp | | Oil & Gas Operator | Dec 2005 |
| 7947 | Delta Operating Company | | Oil Operator | Mar 1987 |
| 7948 | Delta Operating Corporation | | Oil & Gas Operator | Feb 2024 |
| 7949 | Delta Petro Corp Of Colorado | Houston, TX 77010-3089 | Gas Operator | Dec 2003 |
| 7950 | Delta Petroleum Company | Houston, TX 77267 | Oil Operator | Aug 1996 |
| 7951 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 7952 | Delta Petroleum Corp Of Co | | Oil & Gas Operator | Oct 2010 |
| 7953 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 7954 | Delta Producers, Inc | Greenville, MS 38703 | Oil & Gas Operator | Dec 2023 |
| 7955 | Delta Producing Corporation | | Oil & Gas Operator | Dec 1996 |
| 7956 | Delta Production Services, LLC | | Oil & Gas Operator | Aug 2002 |
| 7957 | Delta Royalties LLC | | Oil & Gas Operator | Dec 2024 |
| 7958 | Delta Sierra Oil & Gas LLC | | Gas Operator | Jan 2018 |
| 7959 | Deltaus Corporation | | Oil & Gas Operator | Oct 1985 |
| 7960 | Deltex Minerals Inc. | Peachtree Cty, GA 30269 | Oil & Gas Operator | Apr 2025 |
| 7961 | Deltex Petroleum | | Oil Operator | Nov 1994 |
| 7962 | Delwintex Oil & Gas Prop., Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2003 |
| 7963 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Feb 2025 |
| 7964 | Demambro, Gene Brian | Mayville, NY 14757 | Gas Operator | Dec 2023 |
| 7965 | Demand Energy, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 1999 |
| 7966 | Demco Oil & Gas Company | Blackwell, OK 74631-4203 | Oil & Gas Operator | Jan 2025 |
| 7967 | Demers - Fleming | Wichita Falls, TX 76305 | Oil & Gas Operator | Mar 2008 |
| 7968 | Demers Oil Production | Byers, TX 76357 | Oil & Gas Operator | Apr 2002 |
| 7969 | Demier Oil Company | Tulsa, OK 74105-2128 | Oil & Gas Operator | Nov 2008 |
| 7970 | Deminex U.S. Oil Company | | Oil & Gas Operator | Jan 1998 |
| 7971 | Demiran Production, Inc. | | Oil Operator | Mar 2008 |
| 7972 | Demo Oil Co | | Oil Operator | Jan 2020 |
| 7973 | Demoss, L. V. | Graham, TX 76450 | Oil & Gas Operator | May 2004 |
| 7974 | Dempsey & Rowe | | Oil Operator | Aug 1986 |
| 7975 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 7976 | Den Cal, Inc. | Borger, TX 79007 | Oil & Gas Operator | Apr 2025 |
| 7977 | Den-Kay Corp. | Plano, TX 75074 | Oil Operator | Aug 2009 |
| 7978 | Denali Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Nov 2018 |
| 7979 | Denali Oil & Gas Management, LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |
| 7980 | Denali Petroleum, LLC | Arlington, TX 76006 | Oil Operator | Mar 2021 |
| 7981 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 7982 | Denbury Offshore, Inc. | | Oil & Gas Operator | Nov 2004 |
| 7983 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 7984 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 7985 | Denchfield, Fred | Neal, KS 66863 | Oil Operator | Dec 1997 |
| 7986 | Denell Oil Corporation | Yukon, OK 73085 | Oil & Gas Operator | Jul 1994 |
| 7987 | Denex Petroleum Corp. | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 7988 | Denex, Inc. | | Oil & Gas Operator | Jul 1983 |
| 7989 | Denham Danny D | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2025 |
| 7990 | Denham Operating Company | Tulsa, OK 74101-3627 | Oil & Gas Operator | Aug 2022 |
| 7991 | Denhart & Denhart | Brownwood, TX 76804 | Oil & Gas Operator | Dec 2001 |
| 7992 | Deni Frank R | | Oil Operator | Dec 2022 |
| 7993 | Denis Roberts Oil | | Oil Operator | Oct 2024 |
| 7994 | Denman J M Oil C | | Oil Operator | Mar 1994 |
| 7995 | Denman-Friesen Co. | Lufkin, TX 75901 | Oil & Gas Operator | Nov 2006 |
| 7996 | Denmark Oil | Wichita, KS 67212 | Oil & Gas Operator | May 2000 |
| 7997 | Dennett'S Inc | Enid, OK 73701-1851 | Oil & Gas Operator | Apr 2014 |
| 7998 | Denney Don | Citrus Heights, CA 95611-2473 | Oil Operator | Aug 2023 |
| 7999 | Dennis & Broun | Bullard, TX 75757 | Oil & Gas Operator | Sep 2003 |
| 8000 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Apr 2025 |