| 1 | K & G Production | | Oil Operator | Jan 2025 |
| 2 | K & S Rentals | | Oil & Gas Operator | May 2013 |
| 3 | K & W Oil Company | MT Carmel, IL 62830 | Oil & Gas Operator | May 2013 |
| 4 | K R S Expl., Inc. | | Oil Operator | Oct 2020 |
| 5 | K Wilson Enterprises Inc. | | Oil Operator | Jan 2025 |
| 6 | K-B Exploration Co. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 7 | K. D. Lankford, Jr & L&N DRLG Co | | Gas Operator | Dec 2010 |
| 8 | K. D. Lankford, Jr., Et Al | | Gas Operator | Dec 2010 |
| 9 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 10 | Kabco Oil & Gas Company | Longview, TX 75604 | Oil & Gas Operator | Jun 2018 |
| 11 | Kabco Production | | Oil & Gas Operator | Sep 1999 |
| 12 | Kabco-Pennington | | Oil & Gas Operator | Oct 1996 |
| 13 | Kadane Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1998 |
| 14 | Kaiser Aluminum Exploration Co | | Oil & Gas Operator | Dec 1986 |
| 15 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 16 | Kaiser Oil (U.S.) LTD. | | Oil & Gas Operator | Apr 1983 |
| 17 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 18 | Kalda Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1994 |
| 19 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Dec 2025 |
| 20 | Kamlok, Inc. | | Oil Operator | Nov 1991 |
| 21 | Kanan Oil & Gas, Inc. | | Oil & Gas Operator | Oct 1987 |
| 22 | Kaneb Energy Company | | Oil & Gas Operator | Jan 1986 |
| 23 | Kaneb Oil & Gas Company | | Oil & Gas Operator | Nov 1985 |
| 24 | Kaneb Operg Co. LTD. PTN. | | Oil & Gas Operator | Aug 1988 |
| 25 | Kanpetro, Inc. | | Oil Operator | May 1991 |
| 26 | Kansas Oil & Gas Corporation | Woodland HLS, CA 91367 | Oil & Gas Operator | Feb 2001 |
| 27 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Dec 2025 |
| 28 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 29 | Kauthar Energy Co., Inc. | | Oil & Gas Operator | Dec 2002 |
| 30 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 31 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 32 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 33 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 34 | Keba Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2015 |
| 35 | Kecco, Inc. | | Oil Operator | May 2002 |
| 36 | Keck Partners | | Oil & Gas Operator | Apr 1989 |
| 37 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 38 | Keith W. Burton | | Oil & Gas Operator | Jan 2025 |
| 39 | Kele Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 40 | Kelley Oil & Sugar Creek Prod. | | Oil & Gas Operator | Oct 1992 |
| 41 | Kelley Oil Corp/Yuma Petroleum | | Gas Operator | Jun 1994 |
| 42 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 43 | Kelley Operating Company, LTD. | | Oil & Gas Operator | Aug 2003 |
| 44 | Kelly Bayou Production | | Oil & Gas Operator | Jan 2025 |
| 45 | Kelly H Baxter | Austin, TX 78767 | Oil & Gas Operator | Nov 2006 |
| 46 | Kelly Oil Co Inc | | Oil & Gas Operator | Sep 2013 |
| 47 | Kem Ventures, LP | Katy, TX 77450 | Oil & Gas Operator | Sep 2025 |
| 48 | Kenergy Petroleum Corp | | Oil & Gas Operator | Dec 1982 |
| 49 | Kenergy-Wainoco | | Oil & Gas Operator | Mar 1981 |
| 50 | Kennedy And Bacheller | | Oil & Gas Operator | Apr 1989 |
| 51 | Kenneth Darnell | | Oil Operator | Jan 2025 |
| 52 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 53 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 54 | Kerr-McGee Oil & Gas Corp. | Houston, TX 77251 | Oil & Gas Operator | Sep 2006 |
| 55 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 56 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 57 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 58 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2015 |
| 59 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 60 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 61 | Key Energy Services, Inc.Altd | | Oil Operator | Dec 2006 |
| 62 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jan 2025 |
| 63 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 64 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2025 |
| 65 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Dec 2025 |
| 66 | Keystone Fuel Oil Co | | Gas Operator | Nov 1997 |
| 67 | Keystone Operating Co. | Round Rock, TX 78681 | Oil & Gas Operator | Dec 2025 |
| 68 | Keystone Productions, LLC | | Gas Operator | Dec 2024 |
| 69 | KFG Petroleum Corporation | | Oil & Gas Operator | Oct 2025 |
| 70 | KFS Investments, L.L.C. | | Oil & Gas Operator | Jul 2009 |
| 71 | Kilco, Inc. | | Gas Operator | Sep 1996 |
| 72 | Killingsworth Oil Co. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 73 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Dec 2025 |
| 74 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 75 | Kilroy Co.- E.L. Cox | | Oil & Gas Operator | Aug 1990 |
| 76 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 77 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 78 | Kimco Energy Corporation | | Oil & Gas Operator | Apr 1989 |
| 79 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |
| 80 | Kinder Gas Inc | | Oil Operator | Dec 2011 |
| 81 | Kinder Morgan Treating LP | | Oil Operator | Jun 2019 |
| 82 | Kinetica Partners, LLC | | Oil Operator | Dec 2024 |
| 83 | King Drilling Co | Seville, OH 44273 | Oil & Gas Operator | Jan 2025 |
| 84 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 85 | King Resources Co. | | Oil & Gas Operator | Dec 1977 |
| 86 | Kings Oil Company, Inc. | | Oil Operator | Jun 1989 |
| 87 | Kingwood Exploration LLC | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2025 |
| 88 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Dec 2025 |
| 89 | Kinsey Interests | | Oil & Gas Operator | May 1991 |
| 90 | Kinsey Interests And Marlin | | Oil Operator | Mar 1983 |
| 91 | Kinsey Interests Et Al | | Oil Operator | Apr 1988 |
| 92 | Kiowa-T.N.T., Inc. | | Oil Operator | Sep 1981 |
| 93 | Kirby Exploration Co Of Texas | | Oil & Gas Operator | Nov 1993 |
| 94 | Kirby Exploration Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2014 |
| 95 | Kirby Oil Company | | Oil Operator | Dec 2024 |
| 96 | Kirkwood Engineering, LTD | | Oil Operator | Dec 1991 |
| 97 | Kisatchie Resources, LTD. | | Gas Operator | Jul 1991 |
| 98 | Kiss Productions | | Oil & Gas Operator | Oct 2002 |
| 99 | KJ Energy, LLC Of Delaware | | Oil & Gas Operator | Nov 2016 |
| 100 | Kmi Continental Off. Prod. Co. | | Oil & Gas Operator | Jan 1988 |