| 901 | Directional Drilling Systems, LLC | Greenwood VIllage, CO 80111 | Oil Operator | Dec 2019 |
| 902 | Dirks Petroleum Company | Beeville, TX 78104 | Oil & Gas Operator | Apr 2024 |
| 903 | Dirks, R. W. | Tuleta, TX 78162 | Oil & Gas Operator | May 1999 |
| 904 | Dirks, R.W. Pet. Eng. Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 1999 |
| 905 | Dirnett, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Apr 2024 |
| 906 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 907 | Discover Resources | Norman, OK 73070 | Oil & Gas Operator | Jan 2011 |
| 908 | Discover Resources LLC | Norman, OK 73072-2310 | Oil & Gas Operator | Jan 2024 |
| 909 | Discovery Energy Corp. CC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2024 |
| 910 | Discovery Energy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2023 |
| 911 | Discovery Energy, LLC | | Oil Operator | Jan 2007 |
| 912 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 913 | Discovery Oil And Gas | Canonburg, PA 15317 | Oil & Gas Operator | Dec 2023 |
| 914 | Discovery Oil LTD | Los Angeles, CA 90067 | Oil & Gas Operator | Jan 1993 |
| 915 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Apr 2024 |
| 916 | Discovery Operating, LLC | | Oil & Gas Operator | Oct 2023 |
| 917 | Discovery Petroleum, L.L.C. | Alice, TX 78333 | Oil & Gas Operator | Apr 2024 |
| 918 | Discus Oil Corporation | | Oil & Gas Operator | Dec 2002 |
| 919 | Dishman, Mitchell & Gorin, Inc | | Oil Operator | Dec 2022 |
| 920 | Ditta Exploration Co., Inc. | | Oil & Gas Operator | Feb 1990 |
| 921 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 922 | Diversified Energy Investments | | Oil & Gas Operator | May 2009 |
| 923 | Diversified Energy LLC | Parker, CO 80138 | Oil & Gas Operator | Jan 2024 |
| 924 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 925 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | Dec 2022 |
| 926 | Diversified Operating Corporation | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 927 | Diversified Production LLC | Minden, LA 71055 | Oil & Gas Operator | Apr 2024 |
| 928 | Diversified Resources LLC | | Gas Operator | Nov 2023 |
| 929 | Diversified Resources, Inc. | Jackson Center, PA 16133 | Oil & Gas Operator | Dec 2020 |
| 930 | Diversified Southern Production LLC | | Oil & Gas Operator | Dec 2018 |
| 931 | Diversity Petroleum, LP | Rockwall, TX 75087 | Oil & Gas Operator | Aug 2010 |
| 932 | Divide Petroleum Co | | Oil & Gas Operator | May 2000 |
| 933 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 934 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |
| 935 | Dixie Natural Gas Co. | | Oil & Gas Operator | Dec 2002 |
| 936 | Dixie Oil Incorp | | Oil Operator | Jul 1992 |
| 937 | Dixie Oil, LLC | Hamilton, KS 66853 | Oil Operator | Nov 2023 |
| 938 | Dixie Operating Company | Spring, TX 77379 | Oil & Gas Operator | Dec 2002 |
| 939 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 940 | Dixie Well Service, Inc. | | Oil & Gas Operator | Jul 1995 |
| 941 | Dixon David | Okmulgee, OK 74447-2066 | Oil & Gas Operator | Dec 2023 |
| 942 | Dixon Energy, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Sep 2023 |
| 943 | Dixon Exploration Inc | Abilene, TX 79604 | Oil & Gas Operator | Oct 2019 |
| 944 | Dixon J C | Okmulgee, OK 74447-8522 | Oil & Gas Operator | Dec 2023 |
| 945 | Dixon Management Corp. | | Oil & Gas Operator | May 1984 |
| 946 | Dixon Oil Compan | | Oil Operator | Apr 1994 |
| 947 | Dixon Operating Company, LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2023 |
| 948 | Dixon, Bucky | | Oil & Gas Operator | Aug 2016 |
| 949 | Dixon, Margaret | Moline, KS 67353 | Oil Operator | Dec 2009 |
| 950 | Dixon, Mike | Moline, KS 67353 | Oil Operator | Oct 2023 |
| 951 | Dixon, N. D. | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 952 | Dixon, Robin Francine | Moline, KS 67353 | Oil Operator | Dec 2023 |
| 953 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 954 | DJ Exploration, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Apr 2024 |
| 955 | DJ Production Services Inc | | Oil & Gas Operator | Sep 2012 |
| 956 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 957 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 958 | DJH Investments, Inc. | Houston, TX 77024 | Oil Operator | Apr 2024 |
| 959 | DJH Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 960 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Apr 2024 |
| 961 | DJR Operating, LLC | Farmington, NM 87401 | Oil & Gas Operator | Feb 2024 |
| 962 | DJR Well Services Inc | McDonald, OH 44437 | Oil & Gas Operator | Dec 2023 |
| 963 | DJS Farms Inc. | Waterloo, NY 13165 | Gas Operator | Dec 2022 |
| 964 | DK Gas Inc | Hawthorn, PA 16230-0228 | Oil & Gas Operator | Dec 2006 |
| 965 | DK Oil Company | Winters, TX 79567 | Oil & Gas Operator | Jul 2022 |
| 966 | DK Operating Inc. | Jetmore, KS 67854 | Oil Operator | Dec 2023 |
| 967 | DKD Production, LLC | Tatum, NM 88267 | Oil Operator | Feb 2024 |
| 968 | DKD,LLC | Tatum, NM 88267 | Oil & Gas Operator | Oct 2022 |
| 969 | DKM Offshore Energy Inc. | | Oil & Gas Operator | Dec 1993 |
| 970 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 971 | DKMR Oil Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2017 |
| 972 | DKW Energy, Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Apr 2024 |
| 973 | DL Energy, LLC | Saco, MT 59261 | Gas Operator | Jan 2024 |
| 974 | DL Resources Inc | Ludlow, PA 16333-0039 | Oil & Gas Operator | Jan 2024 |
| 975 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 976 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2024 |
| 977 | DLJ Investments, LLC | Springboro, OH 45006 | Oil Operator | Dec 2022 |
| 978 | DLKB Operating LLC | | Gas Operator | Dec 2023 |
| 979 | DLM Energy | Houston, TX 77058 | Oil & Gas Operator | Sep 1994 |
| 980 | DLM Oil | | Oil Operator | Nov 2008 |
| 981 | DLM Ventures | | Oil & Gas Operator | Dec 2004 |
| 982 | DLM Ventures LLC | | Oil & Gas Operator | Dec 2004 |
| 983 | DM Backhoe Service | Iowa Park, TX 76367 | Oil Operator | Apr 2024 |
| 984 | DM Petroleum LLC | Duncan, OK 73533 | Oil Operator | Dec 2023 |
| 985 | DMH Petroleum, Inc. | Sterling, KS 67579 | Oil Operator | Dec 2023 |
| 986 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 987 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Jan 2024 |
| 988 | DMV Pipeline LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |
| 989 | Dna Petroleum Inc. | | Oil Operator | Dec 2004 |
| 990 | DNB Drilling, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2001 |
| 991 | DNL Oil Corp | New Lexington, OH 43764 | Oil & Gas Operator | Dec 2012 |
| 992 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Feb 2024 |
| 993 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 994 | Dobbs Oil & Gas | | Oil Operator | Dec 2013 |
| 995 | Dobbs Petroleum Co. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2024 |
| 996 | Dobrinski, Mark E., A General Partnership | Coldwater, KS 67029 | Oil Operator | Feb 2008 |
| 997 | Dobson Oil And Gas LLC | Deer Creek, OK 74636-9521 | Oil Operator | Aug 2022 |
| 998 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 999 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 1000 | Doc Oil Corp. | | Oil Operator | Dec 2006 |