| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2024 |
| 2 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 3 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 4 | Alturas Energy, LLC | Sidney, MT 59270 | Oil Operator | Mar 2022 |
| 5 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 6 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 7 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 8 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 9 | Basic Earth Science Systems, Inc. | Austin, TX 78714 | Oil & Gas Operator | Apr 2010 |
| 10 | Behm Energy, Inc. | Minot, ND 58702 | Oil & Gas Operator | Oct 2024 |
| 11 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 12 | Black Hawk Resources, LLC | Bowman, ND 58623 | Oil & Gas Operator | Jun 2011 |
| 13 | Bowline Energy LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2022 |
| 14 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 15 | Broschat Engineering & Management Services, Inc. | | Oil & Gas Operator | May 2017 |
| 16 | Bruin E&P Operating, LLC | | Oil & Gas Operator | Oct 2021 |
| 17 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 18 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 19 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Dec 2024 |
| 20 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 21 | Burnett Energy Inc. | | Oil & Gas Operator | Oct 2024 |
| 22 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 23 | Camwest II LP | McKinney, TX 75070 | Oil & Gas Operator | Jul 2007 |
| 24 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 25 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2024 |
| 26 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 27 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2024 |
| 28 | Christmann Energy Corp. | | Oil & Gas Operator | Feb 1991 |
| 29 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Dec 2024 |
| 30 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 31 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2024 |
| 32 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 33 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 34 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 35 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 36 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 37 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2024 |
| 38 | D90 Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 39 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 40 | Dakota-3 E&P Company, LLC | | Oil & Gas Operator | Jan 2012 |
| 41 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2024 |
| 42 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 43 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 44 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Dec 2024 |
| 45 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Oct 2024 |
| 46 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 47 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2024 |
| 48 | Emerald Oil, Inc | | Oil & Gas Operator | Dec 2016 |
| 49 | Empire North Dakota LLC | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2024 |
| 50 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 51 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Oct 2024 |
| 52 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 53 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 54 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Sep 2024 |
| 55 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 56 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 57 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 58 | Equinor Energy LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2021 |
| 59 | Exeter Exploration Co. | | Oil & Gas Operator | Aug 1985 |
| 60 | F & L Petroleum, LLC | | Oil & Gas Operator | Apr 2019 |
| 61 | Filco Incorporated | | Oil & Gas Operator | Oct 2024 |
| 62 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 63 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 64 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2024 |
| 65 | G3 Operating, LLC | | Oil & Gas Operator | May 2013 |
| 66 | Gas Producing Enterprises Inc. | | Oil & Gas Operator | Oct 1985 |
| 67 | Georesources, Inc. | Williston, ND 58802-1505 | Oil & Gas Operator | Dec 2014 |
| 68 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |
| 69 | Grayson Mill Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2024 |
| 70 | Griffon & Associates, L.L.C. | Pearland, TX 77581 | Oil & Gas Operator | Jul 2008 |
| 71 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 72 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 73 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 74 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 75 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Oct 2024 |
| 76 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 77 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 78 | HNG Oil Company | | Oil & Gas Operator | Jun 1987 |
| 79 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2024 |
| 80 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 81 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 82 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 83 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 84 | Iron Oil Operating, LLC | | Oil & Gas Operator | Oct 2024 |
| 85 | J.P. Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 86 | Jettison, Inc. | | Oil & Gas Operator | Nov 2024 |
| 87 | John L. Cox | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 88 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2024 |
| 89 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jun 2024 |
| 90 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 91 | Kissinger Petroleum Corp | | Oil & Gas Operator | Nov 1983 |
| 92 | Kodiak Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2020 |
| 93 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 94 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2024 |
| 95 | Leland Oil & Gas, LLC | | Oil & Gas Operator | Oct 2024 |
| 96 | Liberty Resources LLC | | Oil & Gas Operator | May 2014 |
| 97 | Liberty Resources Management Co LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 98 | Lime Rock Resources V-A, LP | | Oil & Gas Operator | Oct 2024 |
| 99 | Lloyd H. Smith | | Oil & Gas Operator | Mar 1972 |
| 100 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |