| 801 | DGM Ag, LLC | Union Springs, NY 13160 | Gas Operator | Dec 2022 |
| 802 | DGP Energy, LLC | Wilmington, DE 19801 | Oil & Gas Operator | Mar 2024 |
| 803 | DH Operating, Inc. | Gordon, TX 76453 | Oil & Gas Operator | May 2024 |
| 804 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 805 | DHC, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1997 |
| 806 | DHP Investments, LTD. | Tyler, TX 75703 | Oil Operator | Jan 2024 |
| 807 | DHW Energy LLC | | Oil Operator | Dec 2023 |
| 808 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 809 | Diablo Oil Corp. | | Oil & Gas Operator | Apr 1989 |
| 810 | Diamar Oil Company, Inc. | | Oil Operator | Nov 1983 |
| 811 | Diamex Company | | Oil & Gas Operator | Oct 1982 |
| 812 | Diamond A Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2001 |
| 813 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 814 | Diamond B Indust | | Oil Operator | Nov 1996 |
| 815 | Diamond B Industries Inc | Belle Fourche, SD 57717 | Oil & Gas Operator | Apr 2010 |
| 816 | Diamond B Miami Flood, LTD. | Paola, KS 66071 | Oil Operator | Jan 2024 |
| 817 | Diamond Chemical | | Oil & Gas Operator | Jan 1995 |
| 818 | Diamond Cross Oil Co LLC | Ponca City, OK 74601-1104 | Oil & Gas Operator | Jan 2024 |
| 819 | Diamond D Operating | | Oil & Gas Operator | Apr 1995 |
| 820 | Diamond Dixie Ex | | Oil Operator | Jul 1985 |
| 821 | Diamond Drilling Co. | | Oil Operator | Apr 1983 |
| 822 | Diamond E Oil Company LLC | Hominy, OK 74035-0676 | Oil Operator | Jan 2024 |
| 823 | Diamond Endeavors Inc | | Oil Operator | Dec 2020 |
| 824 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 825 | Diamond Energy Partners LLC | Vienna, OH 44473 | Oil & Gas Operator | Jan 2024 |
| 826 | Diamond Energy Services LLC | | Oil & Gas Operator | Jan 2016 |
| 827 | Diamond Energy Services, LP | Tulsa, OK 74103 | Oil Operator | May 2024 |
| 828 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | May 2024 |
| 829 | Diamond G Production | FT Stockton, TX 79735 | Oil & Gas Operator | May 2024 |
| 830 | Diamond Halo Group LLC | Grandview, TX 76050 | Oil Operator | Dec 2023 |
| 831 | Diamond Harry H Inc | Shawnee, OK 74802-0336 | Oil & Gas Operator | Feb 2024 |
| 832 | Diamond M DRLG & Expl Co. | San Antonio, TX 78217 | Oil & Gas Operator | May 2024 |
| 833 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2024 |
| 834 | Diamond Mineral Investments Inc. | Bangs, TX 76823 | Gas Operator | Feb 2008 |
| 835 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Mar 2024 |
| 836 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | May 2024 |
| 837 | Diamond Oil Co | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1992 |
| 838 | Diamond Onshore Production, L. L. C. | | Oil & Gas Operator | Sep 2005 |
| 839 | Diamond Operating, Inc. | | Oil & Gas Operator | Feb 2022 |
| 840 | Diamond Petroleum LLC | | Oil & Gas Operator | Dec 2005 |
| 841 | Diamond Production Company LLC | Irving, TX 75016-7853 | Oil & Gas Operator | Jan 2024 |
| 842 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2024 |
| 843 | Diamond S Gathering Co | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1997 |
| 844 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | May 2024 |
| 845 | Diamond S Operating Co. | | Oil & Gas Operator | Oct 1992 |
| 846 | Diamond Shamrock Chem Co | Irving, TX 75061 | Oil & Gas Operator | Dec 1990 |
| 847 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 848 | Diamond Shamrock Expl | Dallas, TX 75201 | Oil & Gas Operator | May 1987 |
| 849 | Diamond Shamrock Expl. Co. | | Oil & Gas Operator | Jun 1987 |
| 850 | Diamond Star Oil, Inc. | Lacygne, KS 66040 | Oil Operator | Dec 2019 |
| 851 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 852 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 853 | Diamondback Operating, LP | Tulsa, OK 74132 | Gas Operator | May 2024 |
| 854 | Diamondback Resources LLC | Midland, TX 79705 | Oil & Gas Operator | May 2018 |
| 855 | Diamondback-Disposal LLC | Oklahoma City, OK 73134-1016 | Oil Operator | Dec 2008 |
| 856 | Diamondhead Oil Co., LLC | | Oil & Gas Operator | Mar 2024 |
| 857 | Diana Pease & Steve Pease Revocable Trust | Wellsville, NY 14895 | Gas Operator | Dec 2022 |
| 858 | Diane Oil Company | Oklahoma City, OK 73146-0157 | Oil & Gas Operator | Jan 2024 |
| 859 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 860 | Dibiaggio Deirdre And Carmichael, Katherine | | Gas Operator | Dec 2022 |
| 861 | Dick Lindsay Oil Company, Inc. | Graham, TX 76450 | Oil Operator | May 2024 |
| 862 | Dickerson Oil | Ratliff City, OK 73481 | Oil Operator | Feb 2024 |
| 863 | Dickman Farms, LLC | Auburn, NY 13021 | Gas Operator | Dec 2022 |
| 864 | Dickson Petroleum | Midland, TX 79710 | Oil & Gas Operator | Nov 1998 |
| 865 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 866 | Didomenico, Thomas J | Jamestown, NY 14701 | Gas Operator | Dec 2022 |
| 867 | Diehl Glenn D Oi | | Oil Operator | Jul 1993 |
| 868 | Diehl Mark | | Oil Operator | Nov 1998 |
| 869 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Jan 2024 |
| 870 | Dieter Prod Comp | | Oil & Gas Operator | Feb 1991 |
| 871 | Dieter Production Company | Durham, KS 67438 | Gas Operator | Mar 2013 |
| 872 | Dietrich Foundation | Pittsburgh, PA 15219 | Gas Operator | Dec 2022 |
| 873 | Dietrich Oil Co., A General Partnership | Humboldt, KS 66748 | Oil Operator | Jul 2000 |
| 874 | Dietrich Philip H | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2022 |
| 875 | Dietrich Resources Corporation | | Oil & Gas Operator | Jun 2007 |
| 876 | Digger Oil & Gas Inc | Prague, OK 74864-0666 | Oil & Gas Operator | Jan 2024 |
| 877 | Digital Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 878 | Dildine Oil Well Service | | Oil Operator | Apr 2011 |
| 879 | Diler Development Inc. | Garland, TX 75043 | Oil & Gas Operator | May 2024 |
| 880 | Dillard & Dillard Inc. | Holliday, TX 76366 | Oil & Gas Operator | May 2024 |
| 881 | Dillard, A. W., Jr. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 882 | Diller Oil Company | Baird, TX 79504 | Oil Operator | May 2024 |
| 883 | Dilley Corp | Yale, OK 74085 | Oil & Gas Operator | May 2013 |
| 884 | Dilley, W.R. & A'Meta I. | Sedan, KS 67361 | Oil Operator | Nov 2015 |
| 885 | Dilligas, Inc. | | Oil Operator | May 1990 |
| 886 | Dillingham Ranch LC | Tulsa, OK 74152 | Oil & Gas Operator | May 2013 |
| 887 | Dillon, H. L., Jr. | Houston, TX 77027 | Oil & Gas Operator | Mar 1996 |
| 888 | Dils Oil & Gas | Parkersburg, WV 26102 | Oil & Gas Operator | Dec 2023 |
| 889 | Dils, Sherman III Dba Dils Oil & Gas | | Oil & Gas Operator | Dec 2020 |
| 890 | Dime Box Oil Company | Austin, TX 78759 | Oil & Gas Operator | Mar 2008 |
| 891 | Dimension Energy Co., L.L.C. | | Oil & Gas Operator | Jan 2024 |
| 892 | Dimes Energy GP Inc. | Olean, NY 14760 | Oil & Gas Operator | Dec 2022 |
| 893 | Dimick Production, LLC | Hamilton, KS 66853 | Oil Operator | Jan 2024 |
| 894 | Dimmit County SWD, LLC | Carrizo SPGS, TX 78834 | Oil Operator | May 2024 |
| 895 | Dimock Operating Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2024 |
| 896 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 897 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 898 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 899 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | May 2024 |
| 900 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |