| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | Adair E H Oil Co | | Oil & Gas Operator | Aug 1994 |
| 3 | Allen Drilling C | | Oil & Gas Operator | Nov 1994 |
| 4 | American Energie | | Oil & Gas Operator | May 1995 |
| 5 | American Explora | | Gas Operator | Apr 1994 |
| 6 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 7 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Jan 2026 |
| 8 | Americase Production Co. | Dallas, TX 75252 | Oil Operator | May 2002 |
| 9 | Antares Oil Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 2015 |
| 10 | Apache Drilling | | Oil Operator | Sep 1994 |
| 11 | Arco Oil & Gas C | | Oil & Gas Operator | Dec 1992 |
| 12 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Apr 2026 |
| 13 | Banks Oil - Lee | | Oil & Gas Operator | Jun 1995 |
| 14 | Bargo Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 15 | Becker Oil Corporation | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2026 |
| 16 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 17 | Beren Corporatio | | Oil & Gas Operator | Dec 1995 |
| 18 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 19 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 20 | Bitter Spar LLC | Wichita, KS 67226 | Oil & Gas Operator | Dec 2025 |
| 21 | Black Dome Energ | | Oil & Gas Operator | Dec 1996 |
| 22 | Black Dome Energy Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 23 | Black Oak Exploration, LLC | Denver, CO 80210 | Oil & Gas Operator | Dec 2025 |
| 24 | Butte Oil And Gas Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Feb 2026 |
| 25 | Buttonwood Petro | | Oil & Gas Operator | Aug 1994 |
| 26 | C. H. Todd, Inc. | Wichita, KS 67212 | Oil & Gas Operator | Dec 2019 |
| 27 | Calvin Explorati | | Oil & Gas Operator | Oct 1991 |
| 28 | Canaday Oil Corp | Goddard, KS 67052 | Oil & Gas Operator | Dec 2025 |
| 29 | Carmen Schmitt, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2025 |
| 30 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 31 | Charter Producti | | Oil & Gas Operator | Jun 1994 |
| 32 | Charter Production Company | Wichita, KS 67202 | Oil & Gas Operator | Feb 2018 |
| 33 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2026 |
| 34 | Citadel Prod Company Inc | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 35 | Claassen Oil And Gas Inc | Estes Park, CO 80517 | Oil & Gas Operator | Jan 2026 |
| 36 | Clarco Gas Co., Inc. | Westmont, IL 60559 | Oil Operator | Dec 2011 |
| 37 | Clayton Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 38 | Clothier, David W. | Eastborough, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 39 | Cobra Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 40 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2026 |
| 41 | Coral Coast Petroleum, L.C. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 42 | Crescent Drillin | | Gas Operator | Apr 1991 |
| 43 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 44 | Daystar Petroleum Inc | Eureka, KS 67045 | Oil & Gas Operator | Dec 2025 |
| 45 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 46 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2026 |
| 47 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Feb 2026 |
| 48 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 49 | Downing-Nelson Oil Co Inc | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 50 | Eagle Energy Resources, LLC | La Porte, TX 77571 | Oil & Gas Operator | Apr 2026 |
| 51 | Eagle Energy, Inc. | Moreland, KS 67650 | Oil & Gas Operator | Dec 2021 |
| 52 | Eason Drilling & Services Co. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2005 |
| 53 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Dec 2025 |
| 54 | Elevate Energy LTD | Aurora, CO 80016 | Oil & Gas Operator | Dec 2025 |
| 55 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 56 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 57 | Enron Corporatio | | Oil & Gas Operator | Aug 1999 |
| 58 | Ensign Oil & Gas Inc. | | Oil & Gas Operator | Jul 1993 |
| 59 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 60 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 61 | Extreme Energy Co | | Oil & Gas Operator | Dec 2025 |
| 62 | Falcon Exploration, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 63 | Farmer John O Inc | Russell, KS 67665 | Oil & Gas Operator | Dec 2025 |
| 64 | Farrar Pump & Supply Co., Inc. | Medicine Lodge, KS 67104 | Oil & Gas Operator | Jun 2009 |
| 65 | Farris Well Service | | Oil & Gas Operator | Dec 2021 |
| 66 | Fina Oil & Chemi | | Oil & Gas Operator | Oct 1995 |
| 67 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 68 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2017 |
| 69 | General Oil Comp | | Oil & Gas Operator | Nov 1993 |
| 70 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 71 | GPM Gas Corporation | Oklahoma City, OK 73102-5627 | Oil & Gas Operator | Nov 1998 |
| 72 | Graham-Michaelis | | Oil & Gas Operator | Nov 1996 |
| 73 | H & C Oil Operat | | Oil & Gas Operator | Dec 1996 |
| 74 | H & M Packers Serv. L.L.C. | | Oil Operator | Dec 2019 |
| 75 | Hammerschmidt Wi | | Oil Operator | Sep 1991 |
| 76 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 77 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 78 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 79 | Hawkins Oil & Ga | | Oil & Gas Operator | Jun 1995 |
| 80 | Haynie Robert L | | Gas Operator | Jan 2004 |
| 81 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Dec 2025 |
| 82 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2025 |
| 83 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 84 | Hondo Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Oct 1995 |
| 85 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 86 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |
| 87 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 88 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 89 | J. K. Brown, Inc. | Littleton, CO 80161 | Gas Operator | Dec 2019 |
| 90 | JBG Oil & Gas Company LLC | Ashland, KS 67831 | Oil & Gas Operator | Dec 2025 |
| 91 | Jeffery Energy Corporation | Meade, KS 67864 | Gas Operator | Dec 2019 |
| 92 | Jo-Allyn Oil Co Inc | Laverne, OK 73848 | Oil & Gas Operator | Jan 2026 |
| 93 | John H. Booth, Inc. | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 94 | Jones G R Oil & | | Oil & Gas Operator | Nov 1993 |
| 95 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2026 |
| 96 | Kansas Petroleum | | Oil & Gas Operator | Dec 1993 |
| 97 | Keith F Walker Oil & Gas Company LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2026 |
| 98 | Kiowa Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 99 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 100 | Knighton Oil Company, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |