| 12001 | GRM LLC | | Oil & Gas Operator | Jun 2021 |
| 12002 | GRMR Oil And Gas LLC | Broomfield, CO 80021 | Oil & Gas Operator | Jun 2025 |
| 12003 | Gro-Tex Exploration | Abilene, TX 79603 | Oil Operator | Jul 2025 |
| 12004 | Grogan Field Production, L.L.C. | | Oil Operator | Jan 2025 |
| 12005 | Grooms T D | Stillwater, OK 74075-3600 | Oil & Gas Operator | Oct 2001 |
| 12006 | Grose, Raymond | Buckhannon, WV 26201-0736 | Oil & Gas Operator | Dec 2003 |
| 12007 | Gross Jack L Production | Borger, TX 79008-0065 | Gas Operator | Mar 2015 |
| 12008 | Gross Todd | Pine Bluffs, WY 82082 | Oil & Gas Operator | Mar 2007 |
| 12009 | Gross William R | | Oil Operator | Feb 1986 |
| 12010 | Gross, Charles E. | Dallas, TX 75220 | Oil & Gas Operator | Feb 2012 |
| 12011 | Gross, L. Jack Production | Borger, TX 79008 | Oil & Gas Operator | Dec 1994 |
| 12012 | Grothe Bros. | Albany, TX 76430 | Oil & Gas Operator | May 2011 |
| 12013 | Grothe Bros., Inc. | Slaton, TX 79364 | Oil & Gas Operator | Jul 2025 |
| 12014 | Grothe, M. L. Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Jun 2010 |
| 12015 | Grothe, M.L. Est. | Slaton, TX 79364 | Oil & Gas Operator | Jul 2025 |
| 12016 | Grothues, G B Oil | Natalia, TX 78059 | Oil Operator | Jul 2025 |
| 12017 | Ground Development Company Inc | Dallas, TX 75229-0377 | Oil & Gas Operator | Jan 2013 |
| 12018 | Ground Resources, LLC | | Oil & Gas Operator | Dec 2021 |
| 12019 | Group Maintenance Corp | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2012 |
| 12020 | Grover Collins | | Oil & Gas Operator | Dec 2002 |
| 12021 | Grover-McKinney Oil Company | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 12022 | Groves, Frank | Arkansas City, KS 67005 | Oil & Gas Operator | Mar 1995 |
| 12023 | GRR Mammoser Partnership | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 12024 | GRS Oil & Gas Company | Irving, TX 75017 | Oil & Gas Operator | Aug 1994 |
| 12025 | Grubb F W "Forest" | Garber, OK 73738-0186 | Oil & Gas Operator | Jun 2005 |
| 12026 | Grubb Ronald J | Clinton, OK 73601-0906 | Oil & Gas Operator | Aug 2013 |
| 12027 | Gruenerwald WM & | | Oil & Gas Operator | Apr 1994 |
| 12028 | Gruenerwald WM & Assoc Inc | Colorado Spring, CO 80960-0669 | Oil & Gas Operator | Jan 2002 |
| 12029 | Grunder Oil, LLC | St John, KS 67576 | Oil Operator | Mar 2025 |
| 12030 | Gruss Petroleum | | Oil Operator | Jan 1986 |
| 12031 | Gruy Management Service Co. | | Oil & Gas Operator | Apr 1982 |
| 12032 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 12033 | Grynberg Petroleum Company | Greenwood Vge, CO 80111-3326 | Oil & Gas Operator | Oct 2019 |
| 12034 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil & Gas Operator | Jan 2023 |
| 12035 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 12036 | Gryphon Exploration Company | Mandeville, LA 70471 | Oil & Gas Operator | Aug 2009 |
| 12037 | GS Energy Of Texas, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2006 |
| 12038 | GSF Energy, L.L.C. | Pittsburgh, PA 15220 | Gas Operator | Mar 2018 |
| 12039 | Gsi Oil & Gas, Inc. | Bryan, TX 77806 | Oil & Gas Operator | Jul 2025 |
| 12040 | GT Energy | | Oil & Gas Operator | Mar 1993 |
| 12041 | GT Productions | Euless, TX 76040 | Oil & Gas Operator | Jan 1997 |
| 12042 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Jul 2025 |
| 12043 | Guadalupe Operating LLP | Midland, TX 79701 | Oil & Gas Operator | Oct 2013 |
| 12044 | Guadalupe Properties, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2013 |
| 12045 | Guaranty Energy Corporation | | Oil & Gas Operator | Aug 1990 |
| 12046 | Guardian Energy Consultants, Inc. | Tulsa, OK 74120 | Gas Operator | Sep 2009 |
| 12047 | Guardian Exploration LLC | Hunt, TX 78024-0225 | Oil & Gas Operator | Dec 2011 |
| 12048 | Guardian Management Inc | Marion, OH 43302 | Oil & Gas Operator | Dec 1997 |
| 12049 | Guardian Oil Company | | Oil & Gas Operator | Aug 1985 |
| 12050 | Guardian Operating Corp. | Midland, TX 79707 | Oil & Gas Operator | Nov 2016 |
| 12051 | Guenthart William & Lavonne | Newcastle, WY 82701 | Oil Operator | Apr 2025 |
| 12052 | Guernsey Petroleum Corp Of MS | | Oil Operator | Jul 1988 |
| 12053 | Guernsey Petroleum Corporation | Atlanta, GA 30318 | Oil & Gas Operator | Nov 1997 |
| 12054 | Guernsey/Rosbottom | | Oil Operator | Apr 1989 |
| 12055 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 12056 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 12057 | Guffey & Galey | | Oil & Gas Operator | Aug 1981 |
| 12058 | Guffey, Roy, Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2011 |
| 12059 | Guffey, WM. R. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2015 |
| 12060 | Gugli Corporation | Byng, OK 74820 | Oil & Gas Operator | Sep 2014 |
| 12061 | Guidance Oil Developers | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 12062 | Guidance Oil Developers, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Mar 2008 |
| 12063 | Guidance Oil Developers,Inc.(1) | Boerne, TX 78006 | Oil Operator | Jul 2025 |
| 12064 | Guido & Arnold | | Oil & Gas Operator | Feb 1982 |
| 12065 | Guido Energy Co & Guernsey Pet | | Oil Operator | Aug 1991 |
| 12066 | Guido Production Co Inc | | Oil Operator | May 1995 |
| 12067 | Guidon Energy MGMT Services LLC | Irving, TX 75062 | Oil & Gas Operator | Dec 2020 |
| 12068 | Guin, Don L. | Flint, TX 75762 | Oil & Gas Operator | Apr 2018 |
| 12069 | Guinn David E | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2025 |
| 12070 | Guinn Investments, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2018 |
| 12071 | Guinn Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Sep 2024 |
| 12072 | Guinn Operating Company | Spring Branch, TX 78070 | Oil & Gas Operator | Feb 2014 |
| 12073 | Guinn Operating Company, LLC | San Antonio, TX 78260 | Oil Operator | Jul 2025 |
| 12074 | Guinotte Company LLC | Ottawa, KS 66067 | Oil Operator | Dec 2009 |
| 12075 | Gulf Bend Resources, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2016 |
| 12076 | Gulf Central Petroleum Corp. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 12077 | Gulf Coast Crude O&G Co., Inc. | | Oil & Gas Operator | May 1982 |
| 12078 | Gulf Coast Energy, Co. | Alvin, TX 77511 | Oil & Gas Operator | Apr 2021 |
| 12079 | Gulf Coast Mineral, LLC | Foley, AL 36535 | Oil & Gas Operator | Jul 2021 |
| 12080 | Gulf Coast Operations, LLC | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Jul 2025 |
| 12081 | Gulf Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Jun 1987 |
| 12082 | Gulf Energy Exploration Corp. | Austin, TX 78716 | Gas Operator | Jul 2025 |
| 12083 | Gulf Exploration Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 12084 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 12085 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 12086 | Gulf Outlet Resources, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 12087 | Gulf Pine Energy, LP | | Oil & Gas Operator | Mar 2025 |
| 12088 | Gulf Production Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 12089 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 12090 | Gulf Refining Co. | | Oil Operator | Dec 2006 |
| 12091 | Gulf Shore Petro. Oper. Co., Inc | Woodland HLS, CA 91367 | Oil & Gas Operator | Apr 1998 |
| 12092 | Gulf South Minerals, Inc. | | Oil Operator | Nov 1993 |
| 12093 | Gulf South Oil & Gas, Inc. | | Oil & Gas Operator | Feb 1990 |
| 12094 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 12095 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 12096 | Gulf South Pipeline Company, LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2020 |
| 12097 | Gulf States Exploration Co. | | Oil & Gas Operator | Dec 1983 |
| 12098 | Gulf States Petro. Corp. | Dallas, TX 75202 | Oil & Gas Operator | Apr 2006 |
| 12099 | Gulf States Pipeline Corp. | | Oil & Gas Operator | May 2003 |
| 12100 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |