| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2025 |
| 2 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 3 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 4 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 5 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 6 | Ansbro Petroleum Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2008 |
| 7 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 8 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 9 | Armstrong Operating, Inc. | Dickinson, ND 58602 | Oil & Gas Operator | Oct 2025 |
| 10 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 11 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Oct 2025 |
| 12 | Basic Earth Science Systems, Inc. | Austin, TX 78714 | Oil & Gas Operator | Apr 2010 |
| 13 | Big Sky Well Service, Inc. | | Oil & Gas Operator | Aug 2018 |
| 14 | Broschat Engineering & Management Services, Inc. | | Oil & Gas Operator | May 2017 |
| 15 | Bruin E&P Operating, LLC | | Oil & Gas Operator | Oct 2021 |
| 16 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 17 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 18 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 19 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 20 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 21 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 22 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 23 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 24 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 25 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 26 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 27 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 28 | Crystal Exploration & Production Company | Shreveport, LA 71120 | Oil & Gas Operator | Feb 1995 |
| 29 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 30 | Devon Energy Williston, L.L.C | Oklahoma City, OK 73102-8260 | Oil & Gas Operator | Sep 2025 |
| 31 | Dry Creek Disposal Company, Inc. | | Oil & Gas Operator | Nov 2021 |
| 32 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 33 | Edward Mike Davis | Las Vegas, NV 89107 | Oil & Gas Operator | Feb 2003 |
| 34 | Edward Mike Davis, L.L.C. | | Oil & Gas Operator | Dec 2006 |
| 35 | Emerald Oil, Inc | | Oil & Gas Operator | Dec 2016 |
| 36 | Empire North Dakota LLC | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 37 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 38 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 39 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 40 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 41 | Farmers Union Central Exchange, Inc. | | Oil & Gas Operator | May 1983 |
| 42 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 43 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 44 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |
| 45 | Griffon & Associates, L.L.C. | Pearland, TX 77581 | Oil & Gas Operator | Jul 2008 |
| 46 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 47 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 48 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 49 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Oct 2025 |
| 50 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 51 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 52 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 53 | J.P. Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 54 | Jettison, Inc. | | Oil & Gas Operator | Oct 2025 |
| 55 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 56 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 57 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 58 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Oct 2025 |
| 59 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 60 | Medora Minerals, LLC | | Oil & Gas Operator | Oct 2025 |
| 61 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 62 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |
| 63 | Morgan E&P, LLC | | Oil & Gas Operator | Oct 2025 |
| 64 | Morningstar Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 65 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Oct 2025 |
| 66 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 67 | Nerdlihc Company, Inc. | Long Beach, CA 90815 | Oil & Gas Operator | Nov 2006 |
| 68 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Dec 2025 |
| 69 | North Range Resources, LLC | | Oil & Gas Operator | Nov 2023 |
| 70 | Northwestern Production LLC | | Oil & Gas Operator | Apr 2024 |
| 71 | Norton Frickey | Lakewood, CO 80215 | Oil & Gas Operator | Dec 2023 |
| 72 | NP Resources, LLC | | Oil & Gas Operator | Aug 2022 |
| 73 | Omimex International Corp | Fort Worth, TX 76103-2300 | Oil & Gas Operator | Aug 2025 |
| 74 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 75 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 76 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 77 | Patrick Petroleum Co. | Jackson, MI 49201 | Oil & Gas Operator | Nov 1993 |
| 78 | Peregrine Petroleum Partners, LTD | | Oil & Gas Operator | Oct 2021 |
| 79 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 80 | Petro-Hunt Dakota, LLC | | Oil & Gas Operator | Oct 2025 |
| 81 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 82 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 83 | Phoenix Petroleum, LLC | | Oil & Gas Operator | Oct 2025 |
| 84 | Pride Energy, An Oklahoma General Partnership | | Oil & Gas Operator | Dec 2020 |
| 85 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 86 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 87 | Ragnar Exploration, LLC | | Oil & Gas Operator | Oct 2025 |
| 88 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Oct 2025 |
| 89 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 90 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 91 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 92 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 93 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 94 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 95 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 96 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 97 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 98 | Specialized Technological Threading, Inc., | | Oil & Gas Operator | Oct 2019 |
| 99 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 100 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |