| 7701 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 7702 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 7703 | DCP, Inc. | | Oil & Gas Operator | Jun 1990 |
| 7704 | DCS Energy | Throckmorton, TX 76483 | Oil Operator | May 2025 |
| 7705 | DDC & T Operating Company, Inc | | Oil & Gas Operator | Jul 2005 |
| 7706 | DDC Energy Corporation | Marietta, GA 30068 | Oil & Gas Operator | Mar 1997 |
| 7707 | DDC Oil LLC | Rockwall, TX 75087-5383 | Oil Operator | Mar 2020 |
| 7708 | DDC Production Company | Archer City, TX 76351 | Oil Operator | May 2025 |
| 7709 | DDC Track, LLC | Bushland, TX 79012 | Oil Operator | May 2025 |
| 7710 | DDD Exploration Inc | Amarillo, TX 79109 | Oil Operator | May 2025 |
| 7711 | De & TZ LLC | Wellsville, KS 66092 | Oil Operator | Jan 2025 |
| 7712 | De Compiegne Prop. Co. 20, The | Midland, TX 79702 | Oil Operator | Oct 2019 |
| 7713 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 7714 | De Kalb Agric Assn Inc | Vernal, UT | Oil & Gas Operator | Jun 1965 |
| 7715 | De La Torre Oil & Gas, Inc | McAllen, TX 78501 | Oil & Gas Operator | May 2025 |
| 7716 | De Larios, R. V., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 7717 | De LTD Family Partnership | Punxsutawney, PA 15767-2646 | Oil & Gas Operator | Dec 2022 |
| 7718 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 7719 | De Soto Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2006 |
| 7720 | De Soto Oil Properties, LLC | | Oil & Gas Operator | Feb 2025 |
| 7721 | De V Operating, LLC | Fort Worth, TX 76107 | Oil Operator | Feb 2025 |
| 7722 | De-Vac Inc. | Daisetta, TX 77533 | Oil Operator | May 2025 |
| 7723 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 7724 | Deacon, Thomas J. | Randolph, NY 14772 | Gas Operator | Dec 2023 |
| 7725 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Mar 2025 |
| 7726 | Dead Horse Oil & Gas LLC | Skiatook, OK 74070-9343 | Oil & Gas Operator | Jun 2015 |
| 7727 | Deagen, Bill & Sons, LTD. | Stockdale, TX 78160 | Oil Operator | May 2018 |
| 7728 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 7729 | Dean Enterprises, Inc. | | Oil & Gas Operator | Jun 2019 |
| 7730 | Dean Petroleum | | Oil & Gas Operator | Jun 2000 |
| 7731 | Dean'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Feb 2025 |
| 7732 | Deanlake Operator, L.L.C. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 7733 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 7734 | Dearinger Compan | | Oil Operator | Dec 1994 |
| 7735 | Deaton, Gary L. Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Mar 2015 |
| 7736 | Deb Oil & Gas | | Gas Operator | Dec 2021 |
| 7737 | Deb Oil & Gas Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 2013 |
| 7738 | Debbie Carroll | | Oil & Gas Operator | Apr 1999 |
| 7739 | Debeaux - Flores | | Oil & Gas Operator | Jan 2025 |
| 7740 | Deblin Oil & Gas, Inc | | Oil & Gas Operator | Aug 1995 |
| 7741 | Deblin Operating LTD | | Oil & Gas Operator | Jan 1997 |
| 7742 | Debord Oil Producers | Lincoln, NE 68503 | Oil Operator | Dec 1998 |
| 7743 | Debord Oil Producers Inc | | Oil Operator | Dec 2006 |
| 7744 | Deca Energy Corporation | | Oil & Gas Operator | Aug 1986 |
| 7745 | Decab Company | Victoria, KS 67671 | Oil Operator | Aug 1996 |
| 7746 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 7747 | Dechant Oil Operations, LLC | Hutchinson, KS 67501 | Oil Operator | Jan 2025 |
| 7748 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 7749 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 7750 | Decker & Associates | | Oil & Gas Operator | Mar 1991 |
| 7751 | Decker Lease Ope | | Oil Operator | Dec 1988 |
| 7752 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | May 2025 |
| 7753 | Decker Petroleum | | Oil & Gas Operator | Oct 2002 |
| 7754 | Decker Well Service LLC | Fleming, OH 45729 | Oil & Gas Operator | Dec 2017 |
| 7755 | Decker, James K. & Tiffany J. | Jamestown, NY 14701 | Oil & Gas Operator | Dec 2023 |
| 7756 | Declar Oil & Gas Inc | | Oil & Gas Operator | Dec 2012 |
| 7757 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 7758 | Deco | Kilgore, TX 75662 | Oil & Gas Operator | Jan 1999 |
| 7759 | Deco Oil Co. | | Oil Operator | Oct 2013 |
| 7760 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 7761 | Dee'S Oil | Wellington, TX 79095 | Oil & Gas Operator | Mar 2008 |
| 7762 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2025 |
| 7763 | Deem, J. F. Oil & Gas, LLC | Parkersburg, WV 26104 | Oil & Gas Operator | Dec 2021 |
| 7764 | Deem, W. A. | Harrisville, WV 26362-7878 | Oil & Gas Operator | Dec 2001 |
| 7765 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | May 2025 |
| 7766 | Deep Creek Adventures, Co. | | Oil Operator | Dec 2018 |
| 7767 | Deep Ford Gas Company | Charleston, WV 25321-0169 | Gas Operator | Dec 2021 |
| 7768 | Deep Gully Oil LLC | Houston, TX 77292 | Oil Operator | May 2025 |
| 7769 | Deep Hole Oil LLC | Ashland, KY 41105 | Oil & Gas Operator | Dec 2020 |
| 7770 | Deep Reef Industries | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2004 |
| 7771 | Deep Resources LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2023 |
| 7772 | Deep River Energy LLC | | Oil Operator | Dec 2024 |
| 7773 | Deep Rock LLC | Tulsa, OK 74137-1612 | Gas Operator | Jun 2022 |
| 7774 | Deep Rock Resources, Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 7775 | Deep South Production | | Oil Operator | Dec 2023 |
| 7776 | Deeprock Disposal Services, LLC | | Oil & Gas Operator | Sep 1991 |
| 7777 | Deepwell Co | | Oil Operator | Jul 1989 |
| 7778 | Deer Creek Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2019 |
| 7779 | Deer Creek Oil & Gas | Atlanta, GA 30326-1000 | Gas Operator | Dec 1987 |
| 7780 | Deer Oil & Gas | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 7781 | Deer Run Oil & Gas LLC | Albion, PA 16401-8306 | Gas Operator | Dec 2024 |
| 7782 | Deer Run Oil Lease, LLC | Caney, KS 67333 | Oil Operator | Jan 2025 |
| 7783 | Dees Production LLC | | Oil Operator | Dec 2024 |
| 7784 | Defranco Oil Account | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2004 |
| 7785 | Deg Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2007 |
| 7786 | Degaugh Well Service Inc | | Oil Operator | Jul 1989 |
| 7787 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 7788 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | Jan 2025 |
| 7789 | Degroot, Garry | South Dayton, NY 14138 | Gas Operator | Dec 2023 |
| 7790 | Deguello Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 7791 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2025 |
| 7792 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Feb 2025 |
| 7793 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |
| 7794 | Deitz Gas & Oil Inc | Clarion, PA 16214-3215 | Oil & Gas Operator | Dec 2024 |
| 7795 | Dejong John B | | Oil Operator | Dec 2024 |
| 7796 | Dejour Energy (USA) Corporation | | Oil & Gas Operator | Jun 2014 |
| 7797 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 7798 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 7799 | Dekasco, Inc. | | Oil & Gas Operator | May 1990 |
| 7800 | Del Amo Energy Co. | | Oil & Gas Operator | Dec 1987 |