| 1 | Abercrombie Energy, LLC | Wichita, KS 67212 | Oil & Gas Operator | Jun 2025 |
| 2 | Adams G C Oil & | | Oil & Gas Operator | Nov 1996 |
| 3 | Albert Thornbrough Trust | Boca Raton, FL 33432 | Gas Operator | Jun 2025 |
| 4 | American Explora | | Gas Operator | Apr 1994 |
| 5 | American Exploration | Houston, TX 77010 | Gas Operator | Apr 1994 |
| 6 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 7 | American Star Energy Services, LLC | Tulsa, OK 74152 | Gas Operator | Jun 2025 |
| 8 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Jun 2025 |
| 9 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 10 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 11 | Antares Oil Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 2015 |
| 12 | Bow Creek Oil Company, General Partnership | Hays, KS 67601 | Oil & Gas Operator | Feb 2017 |
| 13 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 14 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 15 | Brock Oil & Gas | | Oil & Gas Operator | Dec 1996 |
| 16 | C & R Petroleum Co. | Duncan, OK 73533-1341 | Oil & Gas Operator | Jun 2025 |
| 17 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2024 |
| 18 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Jul 2025 |
| 19 | Chesapeake Energy | | Oil & Gas Operator | Dec 2009 |
| 20 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 21 | Cimarex Energy Co. | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 22 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Jun 2025 |
| 23 | Cycle Oil & Gas LTD | | Gas Operator | Jun 2025 |
| 24 | Domar Oil & Gas | | Gas Operator | May 1995 |
| 25 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 26 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Jun 2025 |
| 27 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 28 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Oct 2025 |
| 29 | Extreme Energy Co | | Oil & Gas Operator | Jun 2025 |
| 30 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 31 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Oct 2025 |
| 32 | Glenwood Resources, Inc. | Wheat Ridge, CO 80033 | Oil & Gas Operator | Apr 2025 |
| 33 | HJ, Inc. | Garden City, KS 67846 | Oil & Gas Operator | Jun 2025 |
| 34 | Horseshoe Operating Inc | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 35 | Hugoton Energy C | | Oil & Gas Operator | Feb 2004 |
| 36 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 37 | Iconic Oil & Gas LLC | Dallas, TX 75229 | Gas Operator | Jun 2025 |
| 38 | Johnson, E. Wallace(Deceased) | Towanda, KS 67144 | Gas Operator | Feb 2016 |
| 39 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 40 | Ladd Petroleum C | | Oil & Gas Operator | Sep 1989 |
| 41 | Lang, Herman - Marital Trust | Garden City, KS 67846 | Oil & Gas Operator | Jun 2025 |
| 42 | Liedtke Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2022 |
| 43 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 44 | Louis Dreyfus Natural Gas Corp. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2015 |
| 45 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 46 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2025 |
| 47 | M M Resources In | | Gas Operator | Feb 1990 |
| 48 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 49 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Aug 2025 |
| 50 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Aug 2025 |
| 51 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 52 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Oct 2025 |
| 53 | Osborn Heirs Com | | Oil & Gas Operator | May 1995 |
| 54 | Osborn Heirs Company LTD | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2025 |
| 55 | Osborn Oil & Gas | | Oil & Gas Operator | Jun 1991 |
| 56 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 57 | Par Petroleum In | | Oil & Gas Operator | Jun 1993 |
| 58 | Par Petroleum, Inc. | Liberal, KS 67901 | Gas Operator | Dec 2009 |
| 59 | Permian Reef, LLC | Greenwood, IN 46143 | Gas Operator | Mar 2011 |
| 60 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 61 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 62 | Plains Petroleum Operating Co. | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 63 | Plateau Operating Corporation | Nashville, TN 37205 | Gas Operator | Jun 2025 |
| 64 | Prairie Gas Operating, LLC | Tulsa, OK 74101 | Gas Operator | Dec 2019 |
| 65 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 66 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 67 | Suerte Oil Company | Howard, KS 67349 | Oil & Gas Operator | Jan 2017 |
| 68 | Tate Exploration | Lakin, KS 67860 | Oil & Gas Operator | Sep 1994 |
| 69 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 70 | Trigg Exploratio | | Gas Operator | Feb 1992 |
| 71 | W. R. Williams, Inc. | Amarillo, TX 79105 | Gas Operator | Dec 2019 |
| 72 | Wallace Oil & Ga | | Gas Operator | Oct 1995 |
| 73 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Oct 2025 |
| 74 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Jul 2025 |
| 75 | Whitco Petroleum, LP | Leoti, KS 67861 | Oil & Gas Operator | Jun 2025 |
| 76 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 77 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 78 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |