| 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 | American Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2010 |
| 5 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 6 | Apex Energy, L.L.C. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2025 |
| 7 | Arsenal Energy USA Inc. | | Oil & Gas Operator | Aug 2016 |
| 8 | Baytex Energy USA LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2014 |
| 9 | Baytex Energy USA LTD | | Oil & Gas Operator | Sep 2014 |
| 10 | Berco Resources LLC | Denver, CO 80206 | Oil & Gas Operator | Sep 2009 |
| 11 | Berco Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 12 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 13 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 14 | Bowline Energy LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2022 |
| 15 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 16 | Broschat Engineering & Management Services, Inc. | | Oil & Gas Operator | May 2017 |
| 17 | Bruin E&P Operating, LLC | | Oil & Gas Operator | Oct 2021 |
| 18 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 19 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 20 | Burnett Energy Inc. | | Oil & Gas Operator | Oct 2025 |
| 21 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 22 | Camwest II LP | McKinney, TX 75070 | Oil & Gas Operator | Jul 2007 |
| 23 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 24 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 25 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 26 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 27 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 28 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 29 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 30 | Crescent Point Energy Us Corp | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 31 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 32 | Dakota Crude, Inc. | | Oil & Gas Operator | Oct 2025 |
| 33 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 34 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 35 | Devon Energy Williston, L.L.C | Oklahoma City, OK 73102-8260 | Oil & Gas Operator | Sep 2025 |
| 36 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 37 | Donald C. Slawson | | Oil Operator | Jun 1985 |
| 38 | Eagle Operating, Inc. | Minot, ND 58701 | Oil & Gas Operator | Oct 2025 |
| 39 | Earl Schwartz Co. | | Oil & Gas Operator | Oct 1989 |
| 40 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Sep 2025 |
| 41 | Emerald Oil, Inc | | Oil & Gas Operator | Dec 2016 |
| 42 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 43 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 44 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 45 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 46 | Ensign Operating Co. | Denver, CO 80202 | Oil & Gas Operator | Jan 2004 |
| 47 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 48 | Equinor Energy LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2021 |
| 49 | Evertson Operating Company Inc | Kimball, NE 69145 | Oil & Gas Operator | Nov 2022 |
| 50 | Farmers Union Central Exchange, Inc. | | Oil & Gas Operator | May 1983 |
| 51 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 52 | G3 Operating, LLC | | Oil & Gas Operator | May 2013 |
| 53 | Gadeco, LLC | | Oil & Gas Operator | Oct 2025 |
| 54 | Galaxy Oil | | Oil & Gas Operator | Oct 2025 |
| 55 | Galaxy Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 56 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 57 | Grayson Mill Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 58 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 59 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 60 | Hardy Salt Co. | | Oil & Gas Operator | Apr 1986 |
| 61 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 62 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Oct 2025 |
| 63 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 64 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 65 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 66 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 67 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 68 | Investors Oil, Inc. | | Oil Operator | Mar 1985 |
| 69 | Jenex Operating Company | The Woodlands, TX 77380-164280209 | Oil & Gas Operator | May 2019 |
| 70 | Journey Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 71 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 72 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 73 | Kissinger Petroleum Corp | | Oil & Gas Operator | Nov 1983 |
| 74 | Koda Resources Operating, LLC | | Oil & Gas Operator | Sep 2025 |
| 75 | Kodiak Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2020 |
| 76 | Kraken Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 77 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 78 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 79 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 80 | Liberty Resources LLC | | Oil & Gas Operator | May 2014 |
| 81 | Liberty Resources Management Co LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 82 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 83 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 84 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 85 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Oct 2025 |
| 86 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 87 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 88 | Mercury Resources LLC | | Oil & Gas Operator | Sep 2025 |
| 89 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 90 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |
| 91 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Oct 2025 |
| 92 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 93 | Neptune Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 94 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 95 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 96 | Nine Point Energy, LLC | | Oil & Gas Operator | Oct 2021 |
| 97 | North Plains Energy, LLC | | Oil & Gas Operator | Jan 2016 |
| 98 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 99 | Northwest Exploration Co | Salt Lake City, UT 84108-0900 | Oil & Gas Operator | Sep 1991 |
| 100 | Nucorp Energy, Inc. | | Oil & Gas Operator | Jan 1985 |