| 7701 | Decker Lease Ope | | Oil Operator | Dec 1988 |
| 7702 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Jul 2025 |
| 7703 | Decker Petroleum | | Oil & Gas Operator | Oct 2002 |
| 7704 | Decker Well Service LLC | Fleming, OH 45729 | Oil & Gas Operator | Dec 2017 |
| 7705 | Decker, James K. & Tiffany J. | Jamestown, NY 14701 | Oil & Gas Operator | Dec 2024 |
| 7706 | Declar Oil & Gas Inc | | Oil & Gas Operator | Dec 2012 |
| 7707 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 7708 | Deco | Kilgore, TX 75662 | Oil & Gas Operator | Jan 1999 |
| 7709 | Deco Oil Co. | | Oil Operator | Oct 2013 |
| 7710 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 7711 | Dee'S Oil | Wellington, TX 79095 | Oil & Gas Operator | Mar 2008 |
| 7712 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 7713 | Deem, J. F. Oil & Gas, LLC | Parkersburg, WV 26104 | Oil & Gas Operator | Dec 2021 |
| 7714 | Deem, W. A. | Harrisville, WV 26362-7878 | Oil & Gas Operator | Dec 2001 |
| 7715 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Jul 2025 |
| 7716 | Deep Creek Adventures, Co. | | Oil Operator | Dec 2018 |
| 7717 | Deep Ford Gas Company | Charleston, WV 25321-0169 | Gas Operator | Dec 2021 |
| 7718 | Deep Gully Oil LLC | Houston, TX 77292 | Oil Operator | Jul 2025 |
| 7719 | Deep Hole Oil LLC | Ashland, KY 41105 | Oil & Gas Operator | Dec 2020 |
| 7720 | Deep Reef Industries | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2004 |
| 7721 | Deep Resources LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2023 |
| 7722 | Deep River Energy LLC | | Oil Operator | May 2025 |
| 7723 | Deep Rock LLC | Tulsa, OK 74137-1612 | Gas Operator | Jun 2022 |
| 7724 | Deep Rock Resources, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 7725 | Deep South Production | | Oil Operator | Dec 2023 |
| 7726 | Deeprock Disposal Services, LLC | | Oil & Gas Operator | Sep 1991 |
| 7727 | Deepwell Co | | Oil Operator | Jul 1989 |
| 7728 | Deer Creek Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2019 |
| 7729 | Deer Creek Oil & Gas | Atlanta, GA 30326-1000 | Gas Operator | Dec 1987 |
| 7730 | Deer Oil & Gas | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 7731 | Deer Run Oil & Gas LLC | Albion, PA 16401-8306 | Gas Operator | Dec 2024 |
| 7732 | Deer Run Oil Lease, LLC | Caney, KS 67333 | Oil Operator | Mar 2025 |
| 7733 | Dees Production LLC | | Oil Operator | Dec 2024 |
| 7734 | Defranco Oil Account | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2004 |
| 7735 | Deg Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2007 |
| 7736 | Degaugh Well Service Inc | | Oil Operator | Jul 1989 |
| 7737 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 7738 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | Jan 2025 |
| 7739 | Degroot, Garry | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 7740 | Deguello Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 7741 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | May 2025 |
| 7742 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Feb 2025 |
| 7743 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |
| 7744 | Deitz Gas & Oil Inc | Clarion, PA 16214-3215 | Oil & Gas Operator | Dec 2024 |
| 7745 | Dejong John B | | Oil Operator | Dec 2024 |
| 7746 | Dejour Energy (USA) Corporation | | Oil & Gas Operator | Jun 2014 |
| 7747 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 7748 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 7749 | Dekasco, Inc. | | Oil & Gas Operator | May 1990 |
| 7750 | Del Amo Energy Co. | | Oil & Gas Operator | Dec 1987 |
| 7751 | Del Energy, Inc | | Oil Operator | Dec 2014 |
| 7752 | Del Mar | Holliday, TX 76366 | Oil & Gas Operator | Jul 2025 |
| 7753 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Jul 2025 |
| 7754 | Del Mar Exploration Company | Houston, TX 77006 | Oil & Gas Operator | Jan 2014 |
| 7755 | Del Oil & Gas Corp | | Oil Operator | Jul 1981 |
| 7756 | Del Petroleum Corporation | Dallas, TX 75219 | Oil & Gas Operator | Jan 2012 |
| 7757 | Del Rio Production Co. | Gainesville, TX 76240 | Oil Operator | Mar 2019 |
| 7758 | Del-Rio Resources Inc | Vernal, UT 84079 | Oil & Gas Operator | Jan 2018 |
| 7759 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 7760 | Delaware Dyche Corp. | Hutchinson, KS 67501 | Oil Operator | Jan 2010 |
| 7761 | Delaware Ecco Petroleum Inc. | Rockwall, TX 75087 | Oil & Gas Operator | Jul 2001 |
| 7762 | Delbert A. Dodson | | Oil Operator | Aug 2002 |
| 7763 | Delcar, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1995 |
| 7764 | Delco Operating Company LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 7765 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 7766 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Jul 2025 |
| 7767 | Delgado, Emil A | San Antonio, TX 78223 | Oil & Gas Operator | Sep 2016 |
| 7768 | Delhi Gas Pipeli | | Gas Operator | Aug 1998 |
| 7769 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 7770 | Delhi Pipeline | | Oil & Gas Operator | Sep 1999 |
| 7771 | Delhi-Taylor Oil Corp | | Oil & Gas Operator | Dec 1974 |
| 7772 | Delhi-Trading LLC | Durango, CO 81301 | Oil & Gas Operator | Jun 2025 |
| 7773 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 7774 | Dell-Ray Investments, Inc. | Nickerson, KS 67561 | Oil Operator | Dec 2019 |
| 7775 | Delmar Operating, Inc. | Houston, TX 77010 | Oil & Gas Operator | Oct 1996 |
| 7776 | Delone, M S | El Dorado, AR 71730 | Oil & Gas Operator | Dec 2024 |
| 7777 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 7778 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 7779 | Delong, Horace | Pleasanton, TX 78064 | Oil & Gas Operator | Jul 2025 |
| 7780 | Delong, Ralph S | | Oil & Gas Operator | Jul 2024 |
| 7781 | Delozier, Orval & Stevens, Floyd, A General Partnership | Dewey, OK 74029 | Oil Operator | Nov 2009 |
| 7782 | Delphi International, Inc. | Tulsa, OK 74104 | Oil Operator | Apr 2025 |
| 7783 | Delphi Oil And Gas LLC | Macomb, OK 74852 | Oil Operator | Apr 2025 |
| 7784 | Delphi Oil, Inc. | Delphi, IN 46923 | Oil & Gas Operator | Mar 2025 |
| 7785 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2025 |
| 7786 | Delta C02, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2021 |
| 7787 | Delta D Operations | Wilson, OK 73463 | Oil & Gas Operator | Jul 2014 |
| 7788 | Delta D Operations Inc | Ardmore, OK 73401-8678 | Oil & Gas Operator | Apr 2014 |
| 7789 | Delta Development Co. Inc. | | Oil & Gas Operator | Dec 1988 |
| 7790 | Delta Energy Resources, Inc. | | Oil & Gas Operator | Jun 1990 |
| 7791 | Delta Expl.& Development Corp. | | Oil & Gas Operator | Jan 2025 |
| 7792 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 7793 | Delta Exploration, LLC | Fredericksbrg, TX 78624 | Oil Operator | Jul 2025 |
| 7794 | Delta Natural Gas Co, Inc | Winchester, KY 40391 | Oil Operator | Dec 2023 |
| 7795 | Delta Oil | Holliday, TX 76366 | Oil & Gas Operator | Sep 2005 |
| 7796 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 7797 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 7798 | Delta Oil Co Inc | | Oil & Gas Operator | Oct 2023 |
| 7799 | Delta Oil Co Inc And Great Lakes Niagaran | | Oil & Gas Operator | Dec 1987 |
| 7800 | Delta Oil Corp | | Oil & Gas Operator | Dec 2005 |