| 1 | 31 Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2024 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Nov 2024 |
| 3 | Albritton Resources Inc | Dallas, TX 75206 | Oil & Gas Operator | Feb 2001 |
| 4 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 5 | Ansbro Petroleum Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2008 |
| 6 | Anschutz Drilling Co. | | Oil Operator | Jul 1961 |
| 7 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 8 | Anschutz Oil Co. | | Oil & Gas Operator | Jul 1984 |
| 9 | Arsenal Energy USA Inc. | | Oil & Gas Operator | Aug 2016 |
| 10 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 11 | B & B Oilfield Services Inc | Windham, OH 44288 | Oil & Gas Operator | Dec 2023 |
| 12 | B. D. Evans Oil Co. | | Oil & Gas Operator | Jun 2017 |
| 13 | Ballantyne Oil | | Oil & Gas Operator | Jul 2010 |
| 14 | Ballantyne Oil, LLC | | Oil & Gas Operator | Mar 2023 |
| 15 | Berco Resources LLC | Denver, CO 80206 | Oil & Gas Operator | Sep 2009 |
| 16 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 17 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 18 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Nov 2024 |
| 19 | Camwest II LP | McKinney, TX 75070 | Oil & Gas Operator | Jul 2007 |
| 20 | Cardinal Petroleum Co. | | Oil & Gas Operator | May 2004 |
| 21 | Carlson Oil Inc. | | Oil & Gas Operator | Oct 2008 |
| 22 | Challenger Point Energy, LLC | | Oil & Gas Operator | Sep 2024 |
| 23 | Chandler & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | May 1997 |
| 24 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 25 | Clearly Petroleum, LLC | Houston, TX 77086 | Oil & Gas Operator | Jun 2020 |
| 26 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2024 |
| 27 | Columbus Production Inc | | Oil & Gas Operator | Mar 2005 |
| 28 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 29 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 30 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Nov 2024 |
| 31 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Sep 2024 |
| 32 | Crescent Point Energy Us Corp | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 33 | D90 Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | Nov 2024 |
| 34 | Dakota Crude, Inc. | | Oil & Gas Operator | Sep 2024 |
| 35 | Dakota Oil Company | Hebbronville, TX 78361 | Oil & Gas Operator | Nov 2024 |
| 36 | Dakota West Pumping, Inc. | | Oil & Gas Operator | Feb 2004 |
| 37 | Denali Oil & Gas Management, LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |
| 38 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Nov 2024 |
| 39 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 40 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Sep 2024 |
| 41 | Elk Oil Company | Overland Park, KS 66212 | Oil & Gas Operator | Sep 2007 |
| 42 | Empire North Dakota LLC | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2024 |
| 43 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 44 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Sep 2024 |
| 45 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 46 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 47 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Oct 2024 |
| 48 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Nov 2024 |
| 49 | Four Starr Production, LLC | Dallas, TX 75243 | Oil & Gas Operator | Nov 2024 |
| 50 | Georesources, Inc. | Williston, ND 58802-1505 | Oil & Gas Operator | Dec 2014 |
| 51 | Great American Royalties, Inc. | | Oil Operator | Oct 2024 |
| 52 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 53 | H. L. Hunt | | Oil & Gas Operator | Jun 1980 |
| 54 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Sep 2024 |
| 55 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 56 | I. J. Wilhite | | Oil Operator | Apr 2000 |
| 57 | Imperial Oil Of North Dakota, Inc. | | Oil & Gas Operator | Jul 2023 |
| 58 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 59 | Jenex Operating Company | The Woodlands, TX 77380-164280209 | Oil & Gas Operator | May 2019 |
| 60 | Jettison, Inc. | | Oil & Gas Operator | Sep 2024 |
| 61 | Jordan Exploration Company, L.L.C. | | Oil & Gas Operator | Mar 2024 |
| 62 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Nov 2024 |
| 63 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 64 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 65 | Liberty Resources Management Co LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 66 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2024 |
| 67 | Mancal Resources Corporation | | Oil & Gas Operator | Aug 2019 |
| 68 | Mar-Win Development Co. | | Oil & Gas Operator | Nov 1988 |
| 69 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Nov 2024 |
| 70 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 71 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 72 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 73 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Sep 2024 |
| 74 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 75 | New Horizon Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2006 |
| 76 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 77 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 78 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 79 | Oasis Petroleum North America LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2024 |
| 80 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 81 | Pan American Petroleum Corp | | Oil & Gas Operator | Jan 2008 |
| 82 | PDC Corporation | | Oil & Gas Operator | Jan 2011 |
| 83 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 84 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 85 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 86 | Phoenix Petroleum, LLC | | Oil & Gas Operator | Sep 2024 |
| 87 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 88 | Prenalta Corporation | Terrytown, NY 10591 | Oil & Gas Operator | Jan 1997 |
| 89 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Sep 2024 |
| 90 | Primewest Petroleum Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jan 2009 |
| 91 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Sep 2024 |
| 92 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Nov 2024 |
| 93 | Ritter, Laber & Associates, Inc. | Williston, ND 58802 | Oil & Gas Operator | Jul 2024 |
| 94 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 95 | Sagebrush Resources, LLC | | Oil & Gas Operator | Jan 2011 |
| 96 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2024 |
| 97 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Nov 2024 |
| 98 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 99 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 100 | Silver Thread Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2015 |