| 5901 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 5902 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 5903 | Karst Incorporated | Fort Worth, TX 76116 | Oil Operator | Dec 2025 |
| 5904 | Kas Productions | La Veta, CO 81055 | Oil Operator | Mar 2008 |
| 5905 | Kasan Corp. | Pharr, TX 78577 | Oil & Gas Operator | Sep 1995 |
| 5906 | Kasle Energy Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2017 |
| 5907 | Kastman Oil Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 2012 |
| 5908 | Kastman Oil Company, LLC | Lubbock, TX 79408 | Oil Operator | Dec 2025 |
| 5909 | Kat Energy Corporation | Amarillo, TX 79105 | Gas Operator | Sep 2001 |
| 5910 | Kat Energy, LTD. | Amarillo, TX 79120 | Gas Operator | Jun 2020 |
| 5911 | Kathler Oil Interests | Frisco, TX 75034 | Oil & Gas Operator | Dec 2025 |
| 5912 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 5913 | Katsco Energy, Inc. | Round Rock, TX 78664 | Oil & Gas Operator | Dec 2025 |
| 5914 | Katy Resources Etx, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2011 |
| 5915 | Katy Resources LLC | Arlington, TX 76016 | Oil & Gas Operator | Dec 2025 |
| 5916 | Katz Oil Co. | San Antonio, TX 78218 | Oil & Gas Operator | Dec 2002 |
| 5917 | Kaye Poth Oil Corp. | Seguin, TX 78155 | Oil & Gas Operator | May 1998 |
| 5918 | Kayuga Co. | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2025 |
| 5919 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Oct 2025 |
| 5920 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 5921 | KCR Energy, L.L.C. | Fate, TX 75132 | Oil Operator | Dec 2025 |
| 5922 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 5923 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 5924 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 5925 | KD Energy, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 5926 | KDM Operating, LLC | The Woodlands, TX 77380 | Oil Operator | Dec 2025 |
| 5927 | KDM Production Co | Ozona, TX 76943 | Oil & Gas Operator | Dec 2025 |
| 5928 | Keahey Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2002 |
| 5929 | Keating Energy, Inc. | FT Washington, PA 19034 | Oil & Gas Operator | Dec 2025 |
| 5930 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Dec 2025 |
| 5931 | Kec Enterprises, Inc. | Springtown, TX 76082 | Oil & Gas Operator | Dec 2025 |
| 5932 | Keeley Oil, L.L.C. | Dallas, TX 75225 | Oil Operator | Dec 2025 |
| 5933 | Keen Operating Company, Inc. | Austin, TX 78705 | Oil & Gas Operator | Aug 2001 |
| 5934 | Keene, Roy J. Jr. | Sugar Land, TX 77498 | Oil & Gas Operator | Jun 2016 |
| 5935 | Keft Oil Company | Pleasanton, TX 78064 | Oil & Gas Operator | Feb 2003 |
| 5936 | Keirus, Inc. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2025 |
| 5937 | Keisling Energy, LLC | Dumas, TX 79029 | Gas Operator | Dec 2025 |
| 5938 | Keisling, H. N. | Pampa, TX 79065 | Oil & Gas Operator | Aug 2015 |
| 5939 | Keith F Walker Oil & Gas Company LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 5940 | Keith Petroleum Corporation | Houston, TX 77063 | Oil & Gas Operator | Jan 1993 |
| 5941 | Kek Exploration LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 5942 | Kellco Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Nov 2007 |
| 5943 | Kellerville Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 5944 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 5945 | Kelly Mahler Operating, LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 5946 | Kelly Resources, LTD. | Frisco, TX 75034 | Oil & Gas Operator | Aug 2004 |
| 5947 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 5948 | Kelsey Operating, Inc. | Houston, TX 77077 | Oil Operator | Feb 2022 |
| 5949 | Kelso Oil LLC | Chase, KS 67524 | Oil & Gas Operator | Apr 2007 |
| 5950 | Kelt Oil & Gas, Inc. | Torrance, CA 90503 | Oil & Gas Operator | Dec 2003 |
| 5951 | Kelton Oil & Gas Co | Wheeler, TX 79096 | Oil Operator | Jun 1991 |
| 5952 | Kelton, B.J. | Rosharon, TX 77583 | Oil & Gas Operator | Dec 2025 |
| 5953 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Dec 2025 |
| 5954 | Kemco Oil | Alice, TX 78332 | Oil & Gas Operator | Aug 2009 |
| 5955 | Kemp, Walter | Talpa, TX 76882 | Gas Operator | Dec 2025 |
| 5956 | Kemper Operating Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2015 |
| 5957 | Ken Petroleum Corporation | Dallas, TX 75206 | Oil & Gas Operator | Feb 2019 |
| 5958 | Ken-Cas Oil Co. | Levelland, TX 79336 | Oil & Gas Operator | Apr 1998 |
| 5959 | Kendrick Oil And Gas Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 5960 | Kendrick Oil Co. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2008 |
| 5961 | Kendrick, Barbara S. | Baytown, TX 77521 | Oil Operator | Dec 2025 |
| 5962 | Kendrick, Paul W. | Baytown, TX 77520 | Oil & Gas Operator | Sep 2005 |
| 5963 | Kenne Exploration, Inc. | Missouri City, TX 77489 | Oil & Gas Operator | Dec 2025 |
| 5964 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 5965 | Kennedy, Joseph D. | Stephenville, TX 76401 | Oil & Gas Operator | Jun 1995 |
| 5966 | Kennedy, R. R. Production, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Dec 2025 |
| 5967 | Kennemer, Darrell | Boyd, TX 76023 | Oil Operator | Dec 2025 |
| 5968 | Kenneth W Cory LTD | Bellaire, TX 77401 | Oil & Gas Operator | Oct 2025 |
| 5969 | Kent, Charles Operating Co. Inc. | Powell, TX 75153 | Oil & Gas Operator | Dec 2007 |
| 5970 | Kenworthy Oil Company | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 5971 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 5972 | Kepa Energy, L.C. | Marshall, TX 75670 | Oil & Gas Operator | Mar 1998 |
| 5973 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 5974 | Kepco. Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 5975 | Kern Co. | Houston, TX 77095 | Oil & Gas Operator | Jan 2021 |
| 5976 | Kerns O & G, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2004 |
| 5977 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 5978 | Kerogen Texas Energy Op LLC | Houston, TX 77060 | Oil & Gas Operator | Feb 2018 |
| 5979 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2025 |
| 5980 | Kerr-McGee Oil & Gas Corp. | Houston, TX 77251 | Oil & Gas Operator | Sep 2006 |
| 5981 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 5982 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 5983 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 5984 | Kerry Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jan 2004 |
| 5985 | Kerry Petroleum Co Inc | Midland, TX 79708 | Oil & Gas Operator | Jun 2010 |
| 5986 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2015 |
| 5987 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 5988 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 5989 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jan 2025 |
| 5990 | Key Operating & Equipment, Inc. | Midlothian, TX 76065 | Oil & Gas Operator | Nov 2024 |
| 5991 | Key Petroleum Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 5992 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2025 |
| 5993 | Key, J. J. | Lubbock, TX 79416 | Oil & Gas Operator | Dec 2025 |
| 5994 | Keystone Energy LLC | Farmington, NM 87499 | Oil & Gas Operator | May 2025 |
| 5995 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 5996 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Dec 2025 |
| 5997 | Keystone Operating Co. | Round Rock, TX 78681 | Oil & Gas Operator | Dec 2025 |
| 5998 | Keystone Petroleum GP LLC | Irving, TX 75039 | Oil & Gas Operator | May 2012 |
| 5999 | Keystone Petroleum NM LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 6000 | Keyway Oil & Gas Operating LLC | Kilgore, TX 75663 | Oil Operator | Oct 2020 |