| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2021 |
| 2 | Advantage Resources Inc | Broomfield, CO 80020 | Oil & Gas Operator | Dec 2020 |
| 3 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 4 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2015 |
| 5 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Jun 2021 |
| 6 | B-Mac Oil Co. | | Oil Operator | Sep 2002 |
| 7 | Berry Energy, Inc. | Clarksburg, WV 26301-2252 | Oil & Gas Operator | Dec 2017 |
| 8 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Apr 2021 |
| 9 | Burlington Resources Oil&Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Dec 2019 |
| 10 | Cenergy Exploration Co. | | Oil & Gas Operator | Dec 1987 |
| 11 | Cenex Inc. | | Oil & Gas Operator | Dec 1994 |
| 12 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 13 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2021 |
| 14 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jun 2021 |
| 15 | Clark Blake | | Gas Operator | Mar 2021 |
| 16 | Conquest Exploration Co. | | Oil & Gas Operator | Mar 1992 |
| 17 | Continental Resources Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2021 |
| 18 | Creek Oil Company | | Oil & Gas Operator | Aug 2001 |
| 19 | Dekalb Energy Co. | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 20 | Depco Inc. | | Oil & Gas Operator | Dec 1987 |
| 21 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 22 | General Atlantic Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 23 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2021 |
| 24 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Sep 2018 |
| 25 | Harper Oil Co. | | Oil & Gas Operator | Dec 2019 |
| 26 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | Aug 2001 |
| 27 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 28 | Inland Oil And Gas Corp. | | Gas Operator | Jun 2014 |
| 29 | Journey Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 30 | Kirkwood Oil And Gas Co. | | Oil Operator | Jan 1988 |
| 31 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 32 | L & J Operating Inc | | Oil & Gas Operator | Aug 2016 |
| 33 | L.L. Tuck | | Oil Operator | Jan 2001 |
| 34 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Apr 2021 |
| 35 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Apr 2008 |
| 36 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jun 2021 |
| 37 | Mosbacher Production Co. | | Oil & Gas Operator | Aug 1984 |
| 38 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Apr 2021 |
| 39 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Jun 2021 |
| 40 | North Finn LLC | | Oil & Gas Operator | Apr 2021 |
| 41 | Ocean Energy Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 42 | P&M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 43 | Patrick Petroleum Co. | | Oil & Gas Operator | Mar 1992 |
| 44 | Pawnee Oil Corp. | | Oil Operator | May 2003 |
| 45 | Petro-Lewis Corp. | | Oil & Gas Operator | Apr 1992 |
| 46 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 47 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Sep 2018 |
| 48 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Nov 2010 |
| 49 | Prima Exploration Inc | Denver, CO 80206 | Oil & Gas Operator | Apr 2021 |
| 50 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 51 | Remuda Energy Development LLC | Billings, MT 59101 | Oil & Gas Operator | Apr 2021 |
| 52 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Jun 2021 |
| 53 | Roosevelt Operating Co. | | Oil Operator | Mar 2021 |
| 54 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Jun 2021 |
| 55 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Mar 2021 |
| 56 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Aug 2018 |
| 57 | Silvco Energy, LLC | | Oil Operator | Apr 2014 |
| 58 | Snyder Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 1993 |
| 59 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Feb 1986 |
| 60 | Solar Petroleum Inc | | Oil Operator | May 1983 |
| 61 | Spyglass Cedar Creek, LP | | Gas Operator | Jul 2012 |
| 62 | The Ozark Corp. | | Oil Operator | Apr 1970 |
| 63 | Thomas L. Sunde | | Oil & Gas Operator | Mar 2021 |
| 64 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | May 2001 |
| 65 | Total Petroleum Inc | Houston, TX 77210 | Oil & Gas Operator | Feb 1998 |
| 66 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 67 | Viable Resources | | Oil Operator | Dec 1984 |
| 68 | Webb Resources Inc | | Oil & Gas Operator | Dec 1985 |
| 69 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Apr 2021 |
| 70 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2021 |
| 71 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Nov 2006 |
| 72 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 73 | Wulf Oil Corp. | | Oil & Gas Operator | Dec 1985 |
| 74 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 75 | Zenergy Operating Co. | | Oil & Gas Operator | Mar 2021 |