| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78258 | Oil & Gas Operator | May 2018 |
| 2 | Advantage Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Jan 2018 |
| 3 | Alpar Resources, Inc. | Perryton, TX 79070-906 | Oil & Gas Operator | Jan 2018 |
| 4 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Jan 2018 |
| 5 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | May 2018 |
| 6 | B-Mac Oil Co. | | Oil Operator | Sep 2002 |
| 7 | Berry Energy, Inc. | Clarksburg, WV 26301-2252 | Oil & Gas Operator | Dec 2016 |
| 8 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Mar 2018 |
| 9 | Burlington Resources Oil And Gas Co. | Houston, TX 77056 | Oil & Gas Operator | Jan 2018 |
| 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 | May 2018 |
| 14 | Citation Oil & Gas Corp | Houston, TX 77269-688 | Oil & Gas Operator | Dec 2018 |
| 15 | Clark Blake | | Oil & Gas Operator | Feb 2018 |
| 16 | Conquest Exploration Co. | Houston, TX 77068 | Oil & Gas Operator | Mar 1992 |
| 17 | Continental Resources Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Mar 2018 |
| 18 | Dekalb Energy Co. | Oklahoma City, OK 73134-2600 | Oil & Gas Operator | Jan 1993 |
| 19 | Depco, Inc. | | Oil & Gas Operator | Dec 1987 |
| 20 | Eclipse Petroleum Corporation | | Oil & Gas Operator | Aug 2003 |
| 21 | General Atlantic Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 22 | Gulf Oil Corp. | Columbia, MS 39429 | Oil & Gas Operator | Feb 2018 |
| 23 | Harper Oil Co. | | Oil & Gas Operator | Jan 2018 |
| 24 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | Aug 2001 |
| 25 | Houston Oil & Minerals Corp. | | Oil & Gas Operator | Aug 1996 |
| 26 | Inland Oil And Gas Corp. | | Gas Operator | Jun 2014 |
| 27 | Journey Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2006 |
| 28 | Kirkwood Oil And Gas Co. | | Oil Operator | Jan 1988 |
| 29 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 30 | L & J Operating Inc | | Oil & Gas Operator | Feb 2018 |
| 31 | L.L. Tuck | | Oil Operator | Jan 2001 |
| 32 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2018 |
| 33 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Apr 2008 |
| 34 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2018 |
| 35 | Mosbacher Production Co. | | Oil & Gas Operator | Dec 1984 |
| 36 | Murex Petroleum Corp. | Humble, TX 77347 | Oil & Gas Operator | Mar 2018 |
| 37 | Nearburg Producing Company | Dallas, TX 75380-3085 | Oil & Gas Operator | May 2018 |
| 38 | North Finn LLC | | Oil & Gas Operator | Dec 2018 |
| 39 | Ocean Energy Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2018 |
| 40 | P&M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 41 | Patrick Petroleum Co. | Houston, TX 77002 | Oil & Gas Operator | Mar 1992 |
| 42 | Pawnee Oil Corp. | | Oil Operator | May 2003 |
| 43 | Peter K. Roosevelt | | Oil & Gas Operator | Feb 2018 |
| 44 | Petro-Lewis Corp. | Houston, TX | Oil & Gas Operator | Apr 1992 |
| 45 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Jan 2018 |
| 46 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2018 |
| 47 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Nov 2010 |
| 48 | Prima Exploration Inc | Denver, CO 80206 | Oil & Gas Operator | Dec 2018 |
| 49 | Ranger Oil Company | | Oil & Gas Operator | Sep 2001 |
| 50 | Remuda Energy Development, LLC | Billings, MT 59101 | Oil & Gas Operator | Dec 2018 |
| 51 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2018 |
| 52 | Sage Energy Company | San Antonio, TX 78216 | Oil & Gas Operator | May 2018 |
| 53 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Mar 2018 |
| 54 | Shell Oil Company | Donaldsonville, LA | Oil & Gas Operator | Feb 2018 |
| 55 | Silvco Energy, LLC | | Oil Operator | Mar 2015 |
| 56 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1993 |
| 57 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Feb 1986 |
| 58 | Solar Petroleum Inc | | Oil & Gas Operator | May 1983 |
| 59 | Spyglass Cedar Creek, LP | | Gas Operator | Feb 2018 |
| 60 | The Ozark Corp. | | Oil Operator | Dec 1970 |
| 61 | Thomas L. Sunde | | Oil & Gas Operator | Feb 2018 |
| 62 | Total Minatome Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | May 2001 |
| 63 | Total Petroleum Inc | Traverse City, MI 49684 | Oil & Gas Operator | Jan 1998 |
| 64 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 65 | Viable Resources | | Oil Operator | Dec 1984 |
| 66 | Webb Resources Inc. | | Oil Operator | Dec 1985 |
| 67 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Dec 2018 |
| 68 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2018 |
| 69 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Nov 2006 |
| 70 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 71 | Wulf Oil Corp. | | Oil & Gas Operator | Dec 1985 |
| 72 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Dec 2018 |
| 73 | Zenergy Operating Co. | | Oil & Gas Operator | Feb 2018 |