| 8001 | Developed Resources Inc | Cheswick, PA 15024-1351 | Oil & Gas Operator | Dec 2024 |
| 8002 | Developing Equities Group LLC | | Oil & Gas Operator | Feb 2008 |
| 8003 | Development Ener | | Oil Operator | Dec 1994 |
| 8004 | Dever Lavon B | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2012 |
| 8005 | Dever Linda K | Norwalk, OH 43767 | Oil & Gas Operator | Dec 2024 |
| 8006 | Devilbiss Contracting, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Oct 2005 |
| 8007 | Devine, C. R., Inc. | Houston, TX 77292 | Oil & Gas Operator | Feb 2018 |
| 8008 | Devon Corporation | | Oil Operator | Oct 1981 |
| 8009 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 8010 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 8011 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 8012 | Devon Energy Operating Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2013 |
| 8013 | Devon Energy Production Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2015 |
| 8014 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 8015 | Devon Energy Williston, L.L.C | Oklahoma City, OK 73102-8260 | Oil & Gas Operator | Sep 2025 |
| 8016 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2015 |
| 8017 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 8018 | Devon Petroleum Corp. | Marietta, OH 45750 | Oil & Gas Operator | Dec 1996 |
| 8019 | Devon Resources Corporation | Jenks, OK 74037-3525 | Oil & Gas Operator | Sep 2025 |
| 8020 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 8021 | Devonian Energy Inc | | Gas Operator | Jun 2025 |
| 8022 | Devonian Energy Inc And Muzyl Oil Corp | | Oil & Gas Operator | Aug 1999 |
| 8023 | Devonian Gas Production, Inc. | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 8024 | Devonian Oil Com | | Oil Operator | Dec 1996 |
| 8025 | Devonian Oil Company | Lawrence, KS 66044 | Oil Operator | May 2001 |
| 8026 | Devonian Resources Inc | Pikeville, KY 41502 | Oil & Gas Operator | Dec 2024 |
| 8027 | Devore Anthony D | Gambier, OH 43022 | Oil & Gas Operator | Dec 2010 |
| 8028 | Devx Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Feb 2004 |
| 8029 | Dew Oil And Gas Co.,Inc. | | Oil & Gas Operator | Dec 1989 |
| 8030 | Dewayne'S Tank Service, Inc. | Saint John, KS 67576 | Oil Operator | Nov 2000 |
| 8031 | Dewbre Petroleum Corporation | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Dec 2025 |
| 8032 | Dewbre, Jerry C., Trustee | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Dec 2025 |
| 8033 | Dewco Exploration | Coleman, TX 76834 | Oil & Gas Operator | Nov 2007 |
| 8034 | Dewco Oil | | Oil Operator | Jun 1996 |
| 8035 | Dewey E. Williams | | Oil Operator | Nov 1978 |
| 8036 | Dewey Energy GP LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2022 |
| 8037 | Dewey Enterprises Inc | | Oil & Gas Operator | Aug 2025 |
| 8038 | Dewey White Etal | | Oil & Gas Operator | Dec 1987 |
| 8039 | Dewey Williams | | Oil Operator | Mar 1992 |
| 8040 | Dews Production LLC | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 8041 | Dexco, Inc. | | Oil & Gas Operator | May 1990 |
| 8042 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Aug 2025 |
| 8043 | DFG Energy Company LLC | Eastland, TX 76448 | Oil & Gas Operator | Dec 2025 |
| 8044 | DFP Oil Company | Tulsa, OK 74114-1345 | Oil & Gas Operator | Dec 2004 |
| 8045 | DG&E/Slocum, Limited Partnership | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 8046 | DGH Oil, LLC | Logan, KS 67646 | Oil Operator | Jun 2025 |
| 8047 | DGH Petroleum, Inc. | | Oil & Gas Operator | Aug 2011 |
| 8048 | DGP Energy, LLC | Wilmington, DE 19801 | Oil & Gas Operator | Oct 2025 |
| 8049 | DH Operating, Inc. | Gordon, TX 76453 | Oil & Gas Operator | Dec 2025 |
| 8050 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 8051 | DHC, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1997 |
| 8052 | DHP Investments, LTD. | Tyler, TX 75703 | Oil Operator | Jun 2025 |
| 8053 | DHW Energy LLC | | Oil Operator | Dec 2024 |
| 8054 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 8055 | Diablo Oil Corp. | | Oil & Gas Operator | Apr 1989 |
| 8056 | Diamar Oil Company, Inc. | | Oil Operator | Nov 1983 |
| 8057 | Diamex Company | | Oil & Gas Operator | Oct 1982 |
| 8058 | Diamond "S" Oil, Inc. | Houston, TX 77065 | Oil & Gas Operator | Apr 1994 |
| 8059 | Diamond A Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2001 |
| 8060 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 8061 | Diamond B Indust | | Oil Operator | Nov 1996 |
| 8062 | Diamond B Industries Inc | Belle Fourche, SD 57717 | Oil & Gas Operator | Apr 2010 |
| 8063 | Diamond B Miami Flood, LTD. | Paola, KS 66071 | Oil Operator | Jun 2025 |
| 8064 | Diamond Chemical | | Oil & Gas Operator | Jan 1995 |
| 8065 | Diamond Cross Oil Co LLC | Ponca City, OK 74601-1104 | Oil & Gas Operator | Aug 2025 |
| 8066 | Diamond D Operating | | Oil & Gas Operator | Apr 1995 |
| 8067 | Diamond Dixie Ex | | Oil Operator | Jul 1985 |
| 8068 | Diamond Drilling Co. | | Oil Operator | Apr 1983 |
| 8069 | Diamond E Oil Company LLC | | Oil Operator | Apr 2025 |
| 8070 | Diamond Endeavors Inc | | Oil Operator | Dec 2020 |
| 8071 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 8072 | Diamond Energy Partners LLC | Collinsville, OK 74021 | Oil & Gas Operator | Oct 2025 |
| 8073 | Diamond Energy Services LLC | Tulsa, OK 74103-3862 | Oil & Gas Operator | Jan 2016 |
| 8074 | Diamond Energy Services, LP | Tulsa, OK 74103 | Oil Operator | Dec 2025 |
| 8075 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Dec 2025 |
| 8076 | Diamond G Production | FT Stockton, TX 79735 | Oil & Gas Operator | Dec 2025 |
| 8077 | Diamond Halo Group LLC | Grandview, TX 76050 | Oil Operator | Mar 2025 |
| 8078 | Diamond Harry H Inc | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2025 |
| 8079 | Diamond M DRLG & Expl Co. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 8080 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 8081 | Diamond M Operating LLC | Kinta, OK 74552 | Gas Operator | Sep 2025 |
| 8082 | Diamond Mineral Investments Inc. | Bangs, TX 76823 | Gas Operator | Feb 2008 |
| 8083 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Oct 2025 |
| 8084 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | Dec 2025 |
| 8085 | Diamond Oil Co | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1992 |
| 8086 | Diamond Onshore Production, L. L. C. | | Oil & Gas Operator | Sep 2005 |
| 8087 | Diamond Operating Inc | | Oil & Gas Operator | Aug 2021 |
| 8088 | Diamond Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2010 |
| 8089 | Diamond Petroleum LLC | | Oil & Gas Operator | Dec 2005 |
| 8090 | Diamond Production Company LLC | Irving, TX 75016-7853 | Oil & Gas Operator | Aug 2025 |
| 8091 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Dec 2025 |
| 8092 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | Dec 2025 |
| 8093 | Diamond S Operating Co. | | Oil & Gas Operator | Oct 1992 |
| 8094 | Diamond Shamrock Chem Co | Irving, TX 75061 | Oil & Gas Operator | Dec 1990 |
| 8095 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 8096 | Diamond Shamrock Expl | Dallas, TX 75201 | Oil & Gas Operator | May 1987 |
| 8097 | Diamond Shamrock Expl. Co. | | Oil & Gas Operator | Jun 1987 |
| 8098 | Diamond Star Oil, Inc. | Lacygne, KS 66040 | Oil Operator | Dec 2019 |
| 8099 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 8100 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Sep 2016 |