| 101 | Quintana Minerals Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2003 |
| 102 | Quintana Pet Okla Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 1998 |
| 103 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 104 | Quintana Petrole | | Oil & Gas Operator | Dec 1995 |
| 105 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 106 | Quintana Petroleum Services | Houston, TX 77253 | Oil & Gas Operator | Jul 1997 |
| 107 | Quintana Petroleum Services Inc | Houston, TX 77253 | Gas Operator | Apr 1996 |
| 108 | Quintana Production Co. | | Oil & Gas Operator | Feb 1987 |
| 109 | Quintana-H H Cullen-Carl O&G | | Oil & Gas Operator | Jul 1984 |
| 110 | Quintanilla, Tony C. | Atascosa, TX 78002 | Oil & Gas Operator | Sep 2025 |
| 111 | Quinton Rental & Repair Serv Inc | Quinton, OK 74561-0432 | Oil & Gas Operator | Mar 2015 |
| 112 | Quintx Exploration, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Nov 2007 |
| 113 | Quisenberry, Gene | | Oil & Gas Operator | Dec 2016 |
| 114 | Quisto Energy Corp. | Kerrville, TX 78029 | Oil & Gas Operator | Jan 1998 |
| 115 | Quisto Expl. & Production, L.C. | Sugar Land, TX 77478 | Oil & Gas Operator | Aug 1998 |
| 116 | Quitman Construction Co., Inc. | Quitman, TX 75783 | Oil & Gas Operator | May 2011 |
| 117 | Quito, Inc. | Bartlesville, OK 74003 | Oil & Gas Operator | Oct 2023 |
| 118 | Quivira Gas Comp | | Gas Operator | Mar 1990 |
| 119 | Quivira Oil & Ex | | Oil Operator | Sep 1985 |
| 120 | Quorum Energy Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 121 | Quorum Lease Bank | Dallas, TX 75240 | Oil Operator | Jun 1996 |