| 7901 | Diamond Onshore Production, L. L. C. | | Oil & Gas Operator | Sep 2005 |
| 7902 | Diamond Operating Inc | | Oil & Gas Operator | Aug 2021 |
| 7903 | Diamond Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2010 |
| 7904 | Diamond Petroleum LLC | | Oil & Gas Operator | Dec 2005 |
| 7905 | Diamond Production Company LLC | Irving, TX 75016-7853 | Oil & Gas Operator | Feb 2026 |
| 7906 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2026 |
| 7907 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | Aug 2026 |
| 7908 | Diamond S Operating Co. | | Oil & Gas Operator | Oct 1992 |
| 7909 | Diamond Shamrock Chem Co | Irving, TX 75061 | Oil & Gas Operator | Dec 1990 |
| 7910 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 7911 | Diamond Shamrock Expl | Dallas, TX 75201 | Oil & Gas Operator | May 1987 |
| 7912 | Diamond Shamrock Expl. Co. | | Oil & Gas Operator | Jun 1987 |
| 7913 | Diamond Star Oil, Inc. | Lacygne, KS 66040 | Oil Operator | Dec 2019 |
| 7914 | Diamond T F Enterprises, Inc. | Sonora, TX 76950 | Gas Operator | Aug 2026 |
| 7915 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2026 |
| 7916 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Sep 2016 |
| 7917 | Diamondback Operating, LP | Tulsa, OK 74132 | Gas Operator | Aug 2026 |
| 7918 | Diamondback Resources LLC | Midland, TX 79705 | Oil & Gas Operator | May 2018 |
| 7919 | Diamondback-Disposal LLC | Oklahoma City, OK 73134-1016 | Oil Operator | Dec 2008 |
| 7920 | Diamondhead Oil Co., LLC | | Oil & Gas Operator | Jun 2026 |
| 7921 | Diana Pease & Steve Pease Revocable Trust | Wellsville, NY 14895 | Gas Operator | Dec 2025 |
| 7922 | Diane Oil Company | Oklahoma City, OK 73146 | Oil & Gas Operator | Apr 2026 |
| 7923 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 7924 | Dibiaggio, Deirdre And Katherine Carmichael | Atlantis, FL 33463 | Gas Operator | Dec 2025 |
| 7925 | Dick Lindsay Oil Company, Inc. | Graham, TX 76450 | Oil Operator | Aug 2026 |
| 7926 | Dickerson Dennis | Velma, OK 73491 | Oil Operator | Apr 2026 |
| 7927 | Dickerson Oil | Ada, OK 74820 | Oil Operator | Mar 2026 |
| 7928 | Dickey Energy Company | Grafton, WV 26354 | Gas Operator | Dec 2015 |
| 7929 | Dickson Petroleum | Midland, TX 79710 | Oil & Gas Operator | Nov 1998 |
| 7930 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 7931 | Didomenico, Thomas J | Jamestown, NY 14701 | Gas Operator | Dec 2025 |
| 7932 | Diehl Glenn D Oi | | Oil Operator | Jul 1993 |
| 7933 | Diehl Mark | | Oil Operator | Nov 1998 |
| 7934 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Apr 2026 |
| 7935 | Dieter Prod Comp | | Oil & Gas Operator | Feb 1991 |
| 7936 | Dieter Production Company | Durham, KS 67438 | Gas Operator | Mar 2013 |
| 7937 | Dietrich Foundation | Pittsburgh, PA 15219 | Gas Operator | Dec 2025 |
| 7938 | Dietrich Oil Co., A General Partnership | Humboldt, KS 66748 | Oil Operator | Jul 2000 |
| 7939 | Dietrich Philip H | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2025 |
| 7940 | Dietrich Resources Corporation | | Oil & Gas Operator | Jun 2007 |
| 7941 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Apr 2026 |
| 7942 | Digital Operating Company LLC | Boerne, TX 78006 | Oil & Gas Operator | Aug 2026 |
| 7943 | Dildine Oil Well Service | | Oil Operator | Apr 2011 |
| 7944 | Diler Development Inc. | Garland, TX 75043 | Oil & Gas Operator | Aug 2026 |
| 7945 | Dillard & Dillard Inc. | Holliday, TX 76366 | Oil & Gas Operator | Aug 2026 |
| 7946 | Dillard, A. W., Jr. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 7947 | Diller Oil Company | Baird, TX 79504 | Oil Operator | Aug 2026 |
| 7948 | Dilley Corp | Yale, OK 74085 | Oil & Gas Operator | May 2013 |
| 7949 | Dilley, W.R. & A'Meta I. | Sedan, KS 67361 | Oil Operator | Nov 2015 |
| 7950 | Dilligas, Inc. | | Oil Operator | May 1990 |
| 7951 | Dillingham Ranch LC | Tulsa, OK 74152 | Oil & Gas Operator | May 2013 |
| 7952 | Dillon, H. L., Jr. | Houston, TX 77027 | Oil & Gas Operator | Mar 1996 |
| 7953 | Dils Oil & Gas | Parkersburg, WV 26101 | Oil & Gas Operator | Dec 2025 |
| 7954 | Dils, Sherman III Dba Dils Oil & Gas | | Oil & Gas Operator | Dec 2020 |
| 7955 | Dime Box Oil Company | Austin, TX 78759 | Oil & Gas Operator | Mar 2008 |
| 7956 | Dimension Energy Co., L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 7957 | Dimes Energy GP Inc. | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 7958 | Dimick Production, LLC | Hamilton, KS 66853 | Oil Operator | Apr 2026 |
| 7959 | Dimmit County SWD, LLC | Carrizo SPGS, TX 78834 | Oil Operator | Aug 2026 |
| 7960 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Aug 2026 |
| 7961 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 7962 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 7963 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Aug 2026 |
| 7964 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | Aug 2026 |
| 7965 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 7966 | Directional Drilling Systems, LLC | Greenwood VIllage, CO 80111 | Oil Operator | Dec 2019 |
| 7967 | Dirks Petroleum Company | Beeville, TX 78104 | Oil & Gas Operator | Aug 2026 |
| 7968 | Dirks, R. W. | Tuleta, TX 78162 | Oil & Gas Operator | May 1999 |
| 7969 | Dirks, R.W. Pet. Eng. Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 1999 |
| 7970 | Dirnett, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Aug 2026 |
| 7971 | Dirty Devil LP | Eenglewood, CO 80111 | Oil & Gas Operator | Apr 1989 |
| 7972 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 7973 | Discover Resources | Norman, OK 73070 | Oil & Gas Operator | Jan 2011 |
| 7974 | Discover Resources LLC | Norman, OK 73072-2310 | Oil & Gas Operator | Apr 2026 |
| 7975 | Discovery Energy Corp. CC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Aug 2026 |
| 7976 | Discovery Energy Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 2026 |
| 7977 | Discovery Energy, LLC | | Oil Operator | Jan 2007 |
| 7978 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2026 |
| 7979 | Discovery Oil And Gas | Canonburg, PA 15317 | Oil & Gas Operator | Dec 2025 |
| 7980 | Discovery Oil LTD | Los Angeles, CA 90067 | Oil & Gas Operator | Jan 1993 |
| 7981 | Discovery Operat | | Gas Operator | Jul 1988 |
| 7982 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 2026 |
| 7983 | Discovery Operating, LLC | | Oil & Gas Operator | Oct 2023 |
| 7984 | Discovery Petroleum, L.L.C. | Alice, TX 78333 | Oil & Gas Operator | Aug 2026 |
| 7985 | Discus Oil Corporation | | Oil & Gas Operator | Dec 2002 |
| 7986 | Ditta Exploration Co., Inc. | | Oil & Gas Operator | Feb 1990 |
| 7987 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 7988 | Diversified Energy Investments | | Oil & Gas Operator | May 2009 |
| 7989 | Diversified Energy LLC | Parker, CO 80138 | Oil & Gas Operator | Apr 2026 |
| 7990 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 7991 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | May 2026 |
| 7992 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 7993 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Aug 2026 |
| 7994 | Diversified Resources LLC | | Gas Operator | Dec 2025 |
| 7995 | Diversified Resources, Inc. | Jackson Center, PA 16133 | Oil & Gas Operator | Dec 2020 |
| 7996 | Diversified Southern Production LLC | | Oil & Gas Operator | Dec 2018 |
| 7997 | Diversity Petroleum, LP | Rockwall, TX 75087 | Oil & Gas Operator | Aug 2010 |
| 7998 | Divide Petroleum Co | | Oil & Gas Operator | May 2000 |
| 7999 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 8000 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |