| 1 | American Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2010 |
| 2 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 3 | Ansbro Petroleum Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2008 |
| 4 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 5 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 6 | Armstrong Operating, Inc. | Dickinson, ND 58602 | Oil & Gas Operator | Aug 2025 |
| 7 | Bigiron Oil & Gas LLC | | Oil & Gas Operator | Aug 2025 |
| 8 | Broschat Engineering & Management Services, Inc. | | Oil & Gas Operator | May 2017 |
| 9 | Bruin E&P Operating, LLC | | Oil & Gas Operator | Oct 2021 |
| 10 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 11 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 12 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 13 | Chandler Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2009 |
| 14 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 15 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 16 | Christmann Energy Corp. | | Oil & Gas Operator | Feb 1991 |
| 17 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 18 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 19 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 20 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 21 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 22 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Aug 2025 |
| 23 | Dakota-3 E&P Company, LLC | | Oil & Gas Operator | Jan 2012 |
| 24 | Deep Creek Adventures, Co. | | Oil Operator | Dec 2018 |
| 25 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 26 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Aug 2025 |
| 27 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 28 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 29 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 30 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 31 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 32 | G3 Operating, LLC | | Oil & Gas Operator | May 2013 |
| 33 | Geolinear Co. | | Oil & Gas Operator | Jul 1996 |
| 34 | Grayson Mill Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 35 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 36 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 37 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 38 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Aug 2025 |
| 39 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 40 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 41 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 42 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 43 | Kodiak Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2020 |
| 44 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 45 | Leland Oil & Gas, LLC | | Oil & Gas Operator | Aug 2025 |
| 46 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 47 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 48 | Marsha Azar | | Oil & Gas Operator | Jan 2017 |
| 49 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 50 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 51 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |
| 52 | Missouri River Royalty Corporation | Bismarck, ND 58504 | Oil & Gas Operator | Aug 2025 |
| 53 | Morningstar Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 54 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Aug 2025 |
| 55 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Aug 2025 |
| 56 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 57 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 58 | North American Resources Company | Billings, MT 59101 | Oil & Gas Operator | Dec 2019 |
| 59 | Oasis Petroleum North America LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 60 | Orion Energy Partners LP | Denver, CO 80202 | Oil & Gas Operator | Nov 2010 |
| 61 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 62 | Oxy Little Knife, LLC | | Oil & Gas Operator | Jan 2016 |
| 63 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 64 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 65 | PDC Corporation | | Oil & Gas Operator | Jan 2011 |
| 66 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 67 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 68 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 69 | Petroshale (Us) Inc. | | Oil & Gas Operator | Aug 2025 |
| 70 | Phoenix Petroleum, LLC | | Oil & Gas Operator | Aug 2025 |
| 71 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Aug 2025 |
| 72 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 73 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Aug 2025 |
| 74 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jun 2025 |
| 75 | Ritter, Laber & Associates, Inc. | Williston, ND 58802 | Oil & Gas Operator | May 2025 |
| 76 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 77 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 78 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 79 | Simray GP, LLC | Richardson, TX 75080 | Oil & Gas Operator | Dec 2015 |
| 80 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Oct 2025 |
| 81 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 82 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Aug 2025 |
| 83 | Specialized Technological Threading, Inc., | | Oil & Gas Operator | Oct 2019 |
| 84 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 85 | Tracker Resource Development II, LLC | | Oil & Gas Operator | Feb 2011 |
| 86 | Upton Resources U.S.A. Inc. | | Oil & Gas Operator | Oct 2013 |
| 87 | Vanderbilt Resources Corp | Midland, TX 79701 | Oil & Gas Operator | Nov 1991 |
| 88 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 89 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 90 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 91 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 92 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 93 | WPX Energy Williston, LLC | | Oil & Gas Operator | Aug 2025 |
| 94 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 95 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |