| 8001 | Diamond Energy Services LLC | Tulsa, OK 74103-3862 | Oil & Gas Operator | Jan 2016 |
| 8002 | Diamond Energy Services, LP | Tulsa, OK 74103 | Oil Operator | Jul 2025 |
| 8003 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Jul 2025 |
| 8004 | Diamond G Production | FT Stockton, TX 79735 | Oil & Gas Operator | Jul 2025 |
| 8005 | Diamond Halo Group LLC | Grandview, TX 76050 | Oil Operator | Mar 2025 |
| 8006 | Diamond Harry H Inc | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2025 |
| 8007 | Diamond M DRLG & Expl Co. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 8008 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 8009 | Diamond Mineral Investments Inc. | Bangs, TX 76823 | Gas Operator | Feb 2008 |
| 8010 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | May 2025 |
| 8011 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | Jul 2025 |
| 8012 | Diamond Oil Co | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1992 |
| 8013 | Diamond Onshore Production, L. L. C. | | Oil & Gas Operator | Sep 2005 |
| 8014 | Diamond Operating, Inc. | | Oil & Gas Operator | Feb 2022 |
| 8015 | Diamond Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2010 |
| 8016 | Diamond Petroleum LLC | | Oil & Gas Operator | Dec 2005 |
| 8017 | Diamond Production Company LLC | Irving, TX 75016-7853 | Oil & Gas Operator | Mar 2025 |
| 8018 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Jul 2025 |
| 8019 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | Jul 2025 |
| 8020 | Diamond S Operating Co. | | Oil & Gas Operator | Oct 1992 |
| 8021 | Diamond Shamrock Chem Co | Irving, TX 75061 | Oil & Gas Operator | Dec 1990 |
| 8022 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 8023 | Diamond Shamrock Expl | Dallas, TX 75201 | Oil & Gas Operator | May 1987 |
| 8024 | Diamond Shamrock Expl. Co. | | Oil & Gas Operator | Jun 1987 |
| 8025 | Diamond Star Oil, Inc. | Lacygne, KS 66040 | Oil Operator | Dec 2019 |
| 8026 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 8027 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 8028 | Diamondback Operating, LP | Tulsa, OK 74132 | Gas Operator | Jul 2025 |
| 8029 | Diamondback Resources LLC | Midland, TX 79705 | Oil & Gas Operator | May 2018 |
| 8030 | Diamondback-Disposal LLC | Oklahoma City, OK 73134-1016 | Oil Operator | Dec 2008 |
| 8031 | Diamondhead Oil Co., LLC | | Oil & Gas Operator | Jun 2025 |
| 8032 | Diana Pease & Steve Pease Revocable Trust | Wellsville, NY 14895 | Gas Operator | Dec 2024 |
| 8033 | Diane Oil Company | Oklahoma City, OK 73146 | Oil & Gas Operator | Feb 2025 |
| 8034 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 8035 | Dibiaggio, Deirdre And Katherine Carmichael | Atlantis, FL 33463 | Gas Operator | Dec 2024 |
| 8036 | Dick Lindsay Oil Company, Inc. | Graham, TX 76450 | Oil Operator | Jul 2025 |
| 8037 | Dickerson Dennis | Velma, OK 73491 | Oil Operator | Apr 2025 |
| 8038 | Dickerson Oil | Ada, OK 74820 | Oil Operator | Jan 2025 |
| 8039 | Dickey Energy Company | Grafton, WV 26354 | Gas Operator | Dec 2015 |
| 8040 | Dickman Farms, LLC | Auburn, NY 13021 | Gas Operator | Dec 2024 |
| 8041 | Dickson Petroleum | Midland, TX 79710 | Oil & Gas Operator | Nov 1998 |
| 8042 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 8043 | Didomenico, Thomas J | Jamestown, NY 14701 | Gas Operator | Dec 2024 |
| 8044 | Diehl Glenn D Oi | | Oil Operator | Jul 1993 |
| 8045 | Diehl Mark | | Oil Operator | Nov 1998 |
| 8046 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 8047 | Dieter Prod Comp | | Oil & Gas Operator | Feb 1991 |
| 8048 | Dieter Production Company | Durham, KS 67438 | Gas Operator | Mar 2013 |
| 8049 | Dietrich Foundation | Pittsburgh, PA 15219 | Gas Operator | Dec 2024 |
| 8050 | Dietrich Oil Co., A General Partnership | Humboldt, KS 66748 | Oil Operator | Jul 2000 |
| 8051 | Dietrich Philip H | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2023 |
| 8052 | Dietrich Resources Corporation | | Oil & Gas Operator | Jun 2007 |
| 8053 | Dietz Oil Field Supply | Dover, OH 44622 | Oil & Gas Operator | Dec 1997 |
| 8054 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Mar 2025 |
| 8055 | Digital Operating Company LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 8056 | Dildine Oil Well Service | | Oil Operator | Apr 2011 |
| 8057 | Diler Development Inc. | Garland, TX 75043 | Oil & Gas Operator | Jul 2025 |
| 8058 | Dillard & Dillard Inc. | Holliday, TX 76366 | Oil & Gas Operator | Jul 2025 |
| 8059 | Dillard, A. W., Jr. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 8060 | Diller Oil Company | Baird, TX 79504 | Oil Operator | Jul 2025 |
| 8061 | Dilley Corp | Yale, OK 74085 | Oil & Gas Operator | May 2013 |
| 8062 | Dilley, W.R. & A'Meta I. | Sedan, KS 67361 | Oil Operator | Nov 2015 |
| 8063 | Dilligas, Inc. | | Oil Operator | May 1990 |
| 8064 | Dillingham Ranch LC | Tulsa, OK 74152 | Oil & Gas Operator | May 2013 |
| 8065 | Dillon, H. L., Jr. | Houston, TX 77027 | Oil & Gas Operator | Mar 1996 |
| 8066 | Dils Oil & Gas | Parkersburg, WV 26101 | Oil & Gas Operator | Dec 2024 |
| 8067 | Dils, Sherman III Dba Dils Oil & Gas | | Oil & Gas Operator | Dec 2020 |
| 8068 | Dime Box Oil Company | Austin, TX 78759 | Oil & Gas Operator | Mar 2008 |
| 8069 | Dimension Energy Co., L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 8070 | Dimes Energy GP Inc. | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 8071 | Dimick Production, LLC | Hamilton, KS 66853 | Oil Operator | Feb 2025 |
| 8072 | Dimmit County SWD, LLC | Carrizo SPGS, TX 78834 | Oil Operator | Jul 2025 |
| 8073 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Jul 2025 |
| 8074 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 8075 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 8076 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 8077 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | Jul 2025 |
| 8078 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 8079 | Direct Petroleum Exploration Inc | | Oil & Gas Operator | Aug 2010 |
| 8080 | Directional Drilling Systems, LLC | Greenwood VIllage, CO 80111 | Oil Operator | Dec 2019 |
| 8081 | Dirks Petroleum Company | Beeville, TX 78104 | Oil & Gas Operator | Jul 2025 |
| 8082 | Dirks, R. W. | Tuleta, TX 78162 | Oil & Gas Operator | May 1999 |
| 8083 | Dirks, R.W. Pet. Eng. Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 1999 |
| 8084 | Dirnett, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 2025 |
| 8085 | Dirty Devil LP | Eenglewood, CO 80111 | Oil & Gas Operator | Apr 1989 |
| 8086 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 8087 | Discover Resources | Norman, OK 73070 | Oil & Gas Operator | Jan 2011 |
| 8088 | Discover Resources LLC | Norman, OK 73072-2310 | Oil & Gas Operator | May 2025 |
| 8089 | Discovery Energy Corp. CC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jul 2025 |
| 8090 | Discovery Energy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 8091 | Discovery Energy, LLC | | Oil Operator | Jan 2007 |
| 8092 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 8093 | Discovery Oil And Gas | Canonburg, PA 15317 | Oil & Gas Operator | Dec 2024 |
| 8094 | Discovery Oil LTD | Los Angeles, CA 90067 | Oil & Gas Operator | Jan 1993 |
| 8095 | Discovery Operat | | Gas Operator | Jul 1988 |
| 8096 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 8097 | Discovery Operating, LLC | | Oil & Gas Operator | Oct 2023 |
| 8098 | Discovery Petroleum, L.L.C. | Alice, TX 78333 | Oil & Gas Operator | Jul 2025 |
| 8099 | Discus Oil Corporation | | Oil & Gas Operator | Dec 2002 |
| 8100 | Ditta Exploration Co., Inc. | | Oil & Gas Operator | Feb 1990 |