| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | Abercrombie A L | | Oil & Gas Operator | Nov 1995 |
| 3 | Abercrombie Energy, LLC | Wichita, KS 67212 | Oil & Gas Operator | Dec 2025 |
| 4 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 5 | Agricultural Energy Services | Edmond, OK 73003 | Oil & Gas Operator | Dec 2025 |
| 6 | American Energy | Abilene, TX 79604 | Oil & Gas Operator | Jul 2004 |
| 7 | American Warrior | | Oil & Gas Operator | Dec 2025 |
| 8 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Jan 2026 |
| 9 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 10 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 11 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 12 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 13 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 14 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Feb 2026 |
| 15 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 16 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 17 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 18 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 19 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2026 |
| 20 | B & B Farm Industries, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2002 |
| 21 | Barbour Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 2026 |
| 22 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 23 | Bear Petroleum LLC | Haysville, KS 67060 | Oil & Gas Operator | Dec 2025 |
| 24 | Beck Resources Incorporated | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2026 |
| 25 | Becker Oil Corpo | | Oil & Gas Operator | Dec 1996 |
| 26 | Becker Oil Corporation | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2026 |
| 27 | Becker, Clyde M. | Ponca City, OK 74601 | Oil & Gas Operator | Oct 2009 |
| 28 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 29 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 30 | Benchmark Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 31 | Beren Corporatio | | Oil & Gas Operator | Dec 1995 |
| 32 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 33 | Berexco Incorpor | | Oil & Gas Operator | Dec 1996 |
| 34 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 35 | Black Oak Exploration, LLC | Denver, CO 80210 | Oil & Gas Operator | Dec 2025 |
| 36 | Blue Mountain Company, Inc. | Wichita, KS 67212 | Oil Operator | Feb 1999 |
| 37 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 38 | Bramble Oil Company | Wichita, KS 67206 | Oil & Gas Operator | Mar 2007 |
| 39 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 40 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 41 | BRG Petroleum LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 42 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 43 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 44 | Burnett Corporat | | Oil & Gas Operator | Oct 1993 |
| 45 | C & R Petroleum Company | Duncan, OK 73533-1341 | Oil & Gas Operator | Dec 2025 |
| 46 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2026 |
| 47 | Cabot Petroleum | | Oil & Gas Operator | Oct 1996 |
| 48 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 49 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Feb 2026 |
| 50 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Jan 2026 |
| 51 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | Dec 2025 |
| 52 | Centennial Energy Company | Torrance, CA 90503 | Oil Operator | Jan 2000 |
| 53 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 54 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2026 |
| 55 | Charter Producti | | Oil & Gas Operator | Jun 1994 |
| 56 | Charter Production Company | Wichita, KS 67202 | Oil & Gas Operator | Feb 2018 |
| 57 | Chautauqua Oil And Gas LLC | Tulsa, OK 74145 | Oil & Gas Operator | Dec 2025 |
| 58 | Chesapeake Energy Marketing, Inc. | | Oil & Gas Operator | Dec 2025 |
| 59 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2026 |
| 60 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 61 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 62 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 63 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 64 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 65 | Claassen Oil And Gas Inc | Estes Park, CO 80517 | Oil & Gas Operator | Jan 2026 |
| 66 | Clayton Corp Petro & NTRL Gas Prodn | Lakewood, CO 80228 | Oil & Gas Operator | Dec 2009 |
| 67 | Continental Ener | | Oil & Gas Operator | Dec 1996 |
| 68 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 69 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2026 |
| 70 | Cox Edwin L & Be | | Oil & Gas Operator | Nov 1989 |
| 71 | Crawford Production Company Inc | Junction City, AR 71749 | Oil & Gas Operator | Dec 2025 |
| 72 | Cross Bar Petroleum, Inc. | Wichita, KS 67205 | Oil & Gas Operator | Jun 2016 |
| 73 | Cross Timbers Op | | Oil & Gas Operator | Nov 1996 |
| 74 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 75 | Darrah Oil Company, LLC | Wichita, KS 67201 | Oil & Gas Operator | Apr 2026 |
| 76 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2026 |
| 77 | Daystar Petroleum Inc | Eureka, KS 67045 | Oil & Gas Operator | Dec 2025 |
| 78 | Deltex Petroleum | | Oil Operator | Nov 1994 |
| 79 | Denmark Oil | Wichita, KS 67212 | Oil & Gas Operator | May 2000 |
| 80 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2026 |
| 81 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 82 | Diamond Chemical | | Oil & Gas Operator | Jan 1995 |
| 83 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Jan 2026 |
| 84 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Feb 2026 |
| 85 | Domar Oil & Gas | | Gas Operator | May 1995 |
| 86 | Domar Oil & Gas Inc | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 87 | Duke Drilling Co | Wichita, KS 67202 | Oil & Gas Operator | Feb 2006 |
| 88 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 89 | Eagle Creek Corporation | Andover, KS 67002 | Oil & Gas Operator | Dec 2025 |
| 90 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Dec 2025 |
| 91 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 92 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 93 | Encore Operating Company | Denver, CO 80227 | Oil & Gas Operator | Dec 2019 |
| 94 | Energy Reserves | | Oil & Gas Operator | Oct 1993 |
| 95 | Energy Reserves Group, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2002 |
| 96 | Engel Farms Corporation | Liberal, KS 67901 | Gas Operator | Mar 2003 |
| 97 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 98 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 99 | Extreme Energy Co | | Oil & Gas Operator | Dec 2025 |
| 100 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jan 2026 |