| 1 | Q. F. Sagdahl | | Oil Operator | Feb 2019 |
| 2 | Q.E.D., Inc. | | Oil & Gas Operator | Dec 1987 |
| 3 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 4 | Quad L Oil Company | | Oil & Gas Operator | Dec 2024 |
| 5 | Quadrant Exploration Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 2000 |
| 6 | Quality Petroleum Corp. | | Oil & Gas Operator | Apr 1990 |
| 7 | Quality Petroleum, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jan 2022 |
| 8 | Quality Production SVC. LLC | | Oil & Gas Operator | Jul 2005 |
| 9 | Quanah Petroleum, Inc. | | Oil & Gas Operator | Sep 1983 |
| 10 | Quantent Energy Partners Operating LLC | | Gas Operator | Dec 2024 |
| 11 | Quantum Resources MGMT, LLC | | Oil & Gas Operator | Nov 2014 |
| 12 | Quarles Drilling Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2008 |
| 13 | Quasha Oil Co. | | Oil & Gas Operator | Feb 1998 |
| 14 | Queen Sand Operating Co. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 15 | Quest Energies | | Oil & Gas Operator | Mar 1997 |
| 16 | Quest Energies Group,LTD. | Shreveport, LA 71106 | Oil & Gas Operator | Mar 1997 |
| 17 | Quest Energies, L.L.C. | | Oil & Gas Operator | Jan 2025 |
| 18 | Quest Exploration L.L.C. | | Oil & Gas Operator | Jul 2014 |
| 19 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 20 | Quiet Sun Investments, Inc. | | Oil & Gas Operator | Sep 2012 |
| 21 | Quinoco Petroleum Inc | | Oil & Gas Operator | Dec 1990 |
| 22 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 23 | Quintana Production Co. | | Oil & Gas Operator | Feb 1987 |
| 24 | Quintana-H H Cullen-Carl O&G | | Oil & Gas Operator | Jul 1984 |