| 1 | Quad Operating, LLC | Garnett, KS 66032 | Oil Operator | Dec 2019 |
| 2 | Quadel Energy Co | | Oil & Gas Operator | Feb 1994 |
| 3 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | Nov 2025 |
| 4 | Quality Well Service, Inc. | Pratt, KS 67124 | Oil Operator | Feb 2006 |
| 5 | Quantum Energy | Red Lodge, MT 59068 | Gas Operator | Jan 1998 |
| 6 | Quantum Operating Company | Denver, CO 80201 | Oil & Gas Operator | Dec 2012 |
| 7 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Nov 2025 |
| 8 | Quest Cherokee LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 9 | Quest Development Co. | | Oil Operator | Sep 2025 |
| 10 | Quest Energy LLC | Salina, KS 67401 | Oil Operator | Sep 2025 |
| 11 | Quest Energy Service Inc. | Chanute, KS 66720 | Oil & Gas Operator | Jan 2009 |
| 12 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2026 |
| 13 | Questar Exploration And Production Company Division Of Questar Urc Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2023 |
| 14 | Quinn Oil Produc | | Oil Operator | Dec 1987 |
| 15 | Quinque Operatin | | Oil & Gas Operator | Jul 1994 |
| 16 | Quinque Operating Company | Liberal, KS 67905 | Oil & Gas Operator | Sep 2025 |
| 17 | Quintana Minerals Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2003 |
| 18 | Quintana Petrole | | Oil & Gas Operator | Dec 1995 |
| 19 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 20 | Quito, Inc. | Bartlesville, OK 74003 | Oil & Gas Operator | Oct 2023 |
| 21 | Quivira Gas Comp | | Gas Operator | Mar 1990 |
| 22 | Quivira Oil & Ex | | Oil Operator | Sep 1985 |
| 23 | Quogue Oil & Gas, Inc. | New York, NY 10022 | Gas Operator | Jun 1998 |