| 901 | Equitable Gas Company | Pittsburgh, PA 15212-5352 | Gas Operator | Dec 2013 |
| 902 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 903 | Equitable Prod Eastern States Exploration Inc | Snow Shoe, PA 16874-0178 | Gas Operator | Dec 2001 |
| 904 | Equitable Production Company | Charleston, WV 25302 | Oil & Gas Operator | Dec 2007 |
| 905 | Equitable Resources Energy | Houston, TX 77056-2742 | Oil & Gas Operator | Sep 1997 |
| 906 | Equitable Resources Energy Co, Western Region | Billings, MT 59102 | Oil & Gas Operator | May 1997 |
| 907 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 908 | Equitrans Inc | Cannonsburg, PA 15317 | Oil & Gas Operator | Dec 2018 |
| 909 | Equitrans, L. P. | Cannonsburg, PA 15317 | Oil & Gas Operator | Jul 2021 |
| 910 | Equity Drilling Company Inc | Dewey, OK 74029 | Oil & Gas Operator | Nov 1998 |
| 911 | Equity Export Oil & Gas Co Inc | Kansas City, MO 64116 | Oil & Gas Operator | Feb 2002 |
| 912 | Equity Oil & Gas Funds Inc | Orlando, FL 32837-6103-6103 | Oil & Gas Operator | Dec 2024 |
| 913 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 914 | Eqv Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Jun 2025 |
| 915 | Eram, Inc. | | Oil & Gas Operator | Dec 2024 |
| 916 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 917 | Erbe, Dwayne E. (Estate) | Neodesha, KS 66757 | Oil Operator | Dec 2024 |
| 918 | Erbert Don Oil C | | Oil Operator | May 1993 |
| 919 | Erbert, Harold | Iola, KS 66749 | Oil Operator | Dec 1992 |
| 920 | Erebor Resources, LLC | Tyler, TX 75702 | Oil & Gas Operator | Oct 2019 |
| 921 | Ereunao Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2003 |
| 922 | Erg Operating Company Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 923 | Erg Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2015 |
| 924 | Ergon Energy Partners, L.P. | Monroe, LA 71207 | Oil & Gas Operator | Apr 2024 |
| 925 | Ergon Exploration, Inc. | | Oil & Gas Operator | Jun 2023 |
| 926 | Ergon, Inc. | | Oil & Gas Operator | Dec 2005 |
| 927 | Eric Petroleum Corp | Austintown, OH 44515-1053 | Oil & Gas Operator | Dec 2024 |
| 928 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 929 | Erie City Erie Cnty | Erie, PA 16501-1149 | Gas Operator | Dec 1999 |
| 930 | Erie City SCH Dist | Erie, PA 16502-2834 | Gas Operator | Dec 2018 |
| 931 | Erie County Water Authority | Cheektowaga, NY 14227 | Gas Operator | Dec 2023 |
| 932 | Erie Hard Chrome Inc | Erie, PA 16511-1750 | Gas Operator | Dec 2014 |
| 933 | Erie Oil & Gas Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 934 | Erie Yacht Club | Erie, PA 16512-0648 | Gas Operator | Dec 2019 |
| 935 | Erin Exploration Associates | | Oil & Gas Operator | Mar 1987 |
| 936 | Erin Oil Co. | Midland, TX 79707 | Oil & Gas Operator | Jun 2025 |
| 937 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 938 | Ermis Vacuum Service | El Campo, TX 77437 | Oil & Gas Operator | Mar 2010 |
| 939 | Ermis Vacuum Service, LLC | El Campo, TX 77437 | Oil & Gas Operator | Jun 2025 |
| 940 | Ernest Operating Company | Rockdale, TX 76567 | Oil & Gas Operator | Jun 2025 |
| 941 | Ernest Starkey, Jr. | | Oil & Gas Operator | Feb 1985 |
| 942 | Ernie L Hegwer Ind | Hobbs, NM 88240 | Oil & Gas Operator | Sep 2002 |
| 943 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 944 | Ernst & Steinle | | Oil Operator | Oct 1991 |
| 945 | Ernst Petroleum Company Inc | Arlington, VA 22201 | Oil & Gas Operator | Aug 2013 |
| 946 | Eroc Gathering Company, LP | | Oil Operator | Jul 2014 |
| 947 | Eros Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 948 | Erp Environmental Fund, Inc. | | Gas Operator | Dec 2018 |
| 949 | Ers Operating Company LLC | Bothell, WA 98012 | Oil & Gas Operator | Jun 2016 |
| 950 | Ers Resources, LLC | Irving, TX 75038 | Oil Operator | Sep 2010 |
| 951 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Jun 2025 |
| 952 | Erskine Operating LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2007 |
| 953 | Erso, Inc. | Houston, TX 77002 | Gas Operator | Mar 1995 |
| 954 | Erson Royalty Company, Inc. | Merkel, TX 79536 | Oil & Gas Operator | Feb 2006 |
| 955 | Erwin Oil & Gas LTD Co | Hobbs, NM 882411506 | Oil & Gas Operator | Apr 2003 |
| 956 | Erwin Oil Company | Jacksboro, TX 76458 | Oil Operator | Jun 2025 |
| 957 | Erwin Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 958 | Erwin W. Saye | | Oil & Gas Operator | Apr 1979 |
| 959 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 960 | Erwin, Sanford P | | Oil & Gas Operator | Apr 2019 |
| 961 | Escalera Resources Co | Casper, WY 82602 | Oil & Gas Operator | May 2018 |
| 962 | Escambia Operating Co. LLC | Gulfport, MS 39501 | Oil & Gas Operator | Mar 2025 |
| 963 | Escher Corporation | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2025 |
| 964 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 965 | Esco Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2009 |
| 966 | Esco Oil Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 967 | Escoba Royalty Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2005 |
| 968 | Escondido Bay Corporation | Dallas, TX 75202 | Oil Operator | Jun 2025 |
| 969 | Escondido Operating, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Jun 2013 |
| 970 | Escondido Petroleum Company, Inc | Houston, TX 77063 | Oil & Gas Operator | Jun 2025 |
| 971 | Escondido Resources GP, LLC | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 972 | Escondido Resources II, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 973 | Escondido Resources Oper Co, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 974 | Escott Oil Inc | Nowata, OK 74048 | Oil & Gas Operator | Feb 2000 |
| 975 | Escudo Oil & Gas, LLC | Houston, TX 77006 | Oil & Gas Operator | Jun 2025 |
| 976 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 977 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 978 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Jun 2025 |
| 979 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 980 | Eskridge Oil & Supply | Tulsa, OK 74105 | Oil Operator | Aug 2014 |
| 981 | Eskridge Production Company | Tulsa, OK 74112-1428 | Oil Operator | Sep 2019 |
| 982 | Eslick Nancy Sue | Bristow, OK 74010-3873 | Oil Operator | Aug 2013 |
| 983 | Esna Operating Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1994 |
| 984 | Esoterra, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Jun 2025 |
| 985 | Esp Development, Inc. | Salina, KS 67401 | Oil Operator | Feb 2025 |
| 986 | Esp Energy, LLC | Nocona, TX 76255 | Oil Operator | Jun 2025 |
| 987 | Espada Operating LLC | San Antonio, TX 78209 | Oil Operator | Jun 2025 |
| 988 | Esper Production Co | Arlington, TX 76011-2427 | Oil & Gas Operator | Apr 2015 |
| 989 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 990 | Esquire Oil And Gas LLC | | Oil & Gas Operator | Jan 2011 |
| 991 | Essex Corporation | | Oil Operator | Jan 1983 |
| 992 | Essex Corporation Of Louisiana | | Oil Operator | Dec 1997 |
| 993 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 994 | Essex Resources, LLC | Coffeyville, KS 67337 | Oil Operator | Feb 2025 |
| 995 | Essman Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2019 |
| 996 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 997 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 998 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 999 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2025 |
| 1000 | Estancia Oil & Gas, LLC | Austin, TX 78716 | Oil & Gas Operator | Jun 2025 |