| 901 | Erie City Erie Cnty | | Gas Operator | Dec 1999 |
| 902 | Erie Hard Chrome Inc | Erie, PA 16511-1750 | Gas Operator | Dec 2014 |
| 903 | Erie Oil & Gas Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 904 | Erin Exploration Associates | | Oil & Gas Operator | Mar 1987 |
| 905 | Erin Oil Co. | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 906 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 907 | Ermis Vacuum Service | El Campo, TX 77437 | Oil & Gas Operator | Mar 2010 |
| 908 | Ermis Vacuum Service, LLC | El Campo, TX 77437 | Oil & Gas Operator | Sep 2026 |
| 909 | Ernest Operating Company | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2026 |
| 910 | Ernest Starkey, Jr. | | Oil & Gas Operator | Feb 1985 |
| 911 | Ernie L Hegwer Ind | Hobbs, NM 88240 | Oil & Gas Operator | Sep 2002 |
| 912 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Sep 2026 |
| 913 | Ernst & Steinle | | Oil Operator | Oct 1991 |
| 914 | Ernst Petroleum Company Inc | Arlington, VA 22201 | Oil & Gas Operator | Aug 2013 |
| 915 | Eroc Gathering Company, LP | | Oil Operator | Jul 2014 |
| 916 | Eros Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2026 |
| 917 | Erp Environmental Fund, Inc. | | Gas Operator | Dec 2018 |
| 918 | Ers Operating Company LLC | Bothell, WA 98012 | Oil & Gas Operator | Jun 2016 |
| 919 | Ers Resources, LLC | Irving, TX 75038 | Oil Operator | Sep 2010 |
| 920 | Erskine Energy, LLC | Hot Springs V, AR 71909 | Oil & Gas Operator | Sep 2026 |
| 921 | Erskine Operating LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2007 |
| 922 | Erso, Inc. | Houston, TX 77002 | Gas Operator | Mar 1995 |
| 923 | Erson Royalty Company, Inc. | Merkel, TX 79536 | Oil & Gas Operator | Feb 2006 |
| 924 | Erwin Oil & Gas LTD Co | Hobbs, NM 882411506 | Oil & Gas Operator | Apr 2003 |
| 925 | Erwin Oil Company | Jacksboro, TX 76458 | Oil Operator | Sep 2026 |
| 926 | Erwin Operating | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 927 | Erwin W. Saye | | Oil & Gas Operator | Apr 1979 |
| 928 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 929 | Erwin, Sanford P | | Oil & Gas Operator | Apr 2019 |
| 930 | Escalera Resources Co | Casper, WY 82602 | Oil & Gas Operator | May 2018 |
| 931 | Escambia Operating Co., LLC | Gulfport, MS 39501 | Oil & Gas Operator | Feb 2026 |
| 932 | Escher Corporation | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2026 |
| 933 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 934 | Esco Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2009 |
| 935 | Esco Oil Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2026 |
| 936 | Escoba Royalty Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2005 |
| 937 | Escondido Bay Corporation | Dallas, TX 75202 | Oil & Gas Operator | Sep 2026 |
| 938 | Escondido Operating, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Jun 2013 |
| 939 | Escondido Petroleum Company, Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 2026 |
| 940 | Escondido Resources GP, LLC | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 941 | Escondido Resources II, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 942 | Escondido Resources Oper Co, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 943 | Escott Oil Inc | Nowata, OK 74048 | Oil & Gas Operator | Feb 2000 |
| 944 | Escudo Oil & Gas, LLC | Houston, TX 77006 | Oil & Gas Operator | Sep 2026 |
| 945 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | May 2026 |
| 946 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 947 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Sep 2026 |
| 948 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 949 | Eskridge Oil & Supply | Tulsa, OK 74105 | Oil Operator | Aug 2014 |
| 950 | Eskridge Production Company | Tulsa, OK 74112-1428 | Oil Operator | Sep 2019 |
| 951 | Eslick Nancy Sue | Bristow, OK 74010-3873 | Oil Operator | Aug 2013 |
| 952 | Esna Operating Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1994 |
| 953 | Esoterra, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Sep 2026 |
| 954 | Esp Development, Inc. | Salina, KS 67401 | Oil Operator | Apr 2026 |
| 955 | Esp Energy, LLC | Nocona, TX 76255 | Oil Operator | Sep 2026 |
| 956 | Espada Operating LLC | San Antonio, TX 78209 | Oil Operator | Sep 2026 |
| 957 | Esper Production Co | Arlington, TX 76011-2427 | Oil & Gas Operator | Apr 2015 |
| 958 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 959 | Esquire Oil And Gas LLC | | Oil & Gas Operator | Jan 2011 |
| 960 | Essex Corporation | | Oil Operator | Jan 1983 |
| 961 | Essex Corporation Of Louisiana | | Oil Operator | Dec 1997 |
| 962 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 963 | Essex Resources, LLC | Coffeyville, KS 67337 | Oil Operator | Apr 2026 |
| 964 | Essman Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2019 |
| 965 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 966 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 967 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 968 | Estacado Energy, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2026 |
| 969 | Estancia Oil & Gas, LLC | Austin, TX 78716 | Oil & Gas Operator | Sep 2026 |
| 970 | Estate Of C.B. Christie Jr | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 971 | Estate Of Crawford Oil & Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 2006 |
| 972 | Estate Of George Cantor | | Oil Operator | Dec 1988 |
| 973 | Estate Of James L. Nelson | Pettus, TX 78146 | Oil & Gas Operator | Sep 2026 |
| 974 | Estate Of James Robert Wells | West Henrietta, NY 14586 | Oil Operator | Dec 2025 |
| 975 | Estate Of L. C. Dougan | | Gas Operator | Dec 1987 |
| 976 | Estate Of Robert J. Burick | Fredonia, NY 14063 | Gas Operator | Dec 2025 |
| 977 | Estate Of William G. Helis | | Oil & Gas Operator | May 1994 |
| 978 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 979 | Estes And Company LLC. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2026 |
| 980 | Estes Operating, Inc. | San Antonio, TX 78210 | Oil & Gas Operator | Mar 2002 |
| 981 | Estes Operating, LLC | La Porte, TX 77571 | Oil & Gas Operator | Sep 2026 |
| 982 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 983 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 984 | Etc Field Services LLC | Dallas, TX 75225 | Oil Operator | Jun 2018 |
| 985 | Etc Oil Co. | Pecos, TX 79772 | Oil & Gas Operator | Mar 2004 |
| 986 | Etc Oil Corp | | Oil & Gas Operator | Mar 1994 |
| 987 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 988 | Etchegoin Oil LLC | | Oil & Gas Operator | Jun 2026 |
| 989 | Etd Oil Co. | | Oil Operator | Oct 1990 |
| 990 | Eternity Exploration, LLC | Coppell, TX 75019 | Oil Operator | Jun 2021 |
| 991 | Ethredge & Rhoads Oil Company | | Oil Operator | Dec 2012 |
| 992 | Ethredge Oil Company | | Oil & Gas Operator | Aug 1998 |
| 993 | Ethyl Gas Company, LLC | | Oil Operator | Jan 2025 |
| 994 | Ethyl Properties Inc | | Oil & Gas Operator | Aug 1989 |
| 995 | Ethyl-Buchanan | | Oil & Gas Operator | Feb 1987 |
| 996 | Etl Hydrocarbons, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Sep 2026 |
| 997 | Etm Operating Company, Inc. | Houston, TX 77079 | Oil Operator | Feb 2009 |
| 998 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 999 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 1000 | Etopsi Oil And Gas, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |