| 901 | Krier Oil Operation | | Oil Operator | Mar 2026 |
| 902 | Krier, Kirby Oil, Inc. | Claflin, KS 67525 | Oil Operator | Mar 2026 |
| 903 | Kriken Oil & Gas | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Jul 2005 |
| 904 | Kriken Oil & Gas, Inc. | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Jul 2026 |
| 905 | Krisco Oil Co. | Kermit, TX 79745 | Oil Operator | Jul 2022 |
| 906 | Kristen Oil And Gas, Inc. | Edna, TX 77957 | Oil & Gas Operator | Jul 2026 |
| 907 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 908 | Kriti Te Energy, Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 2017 |
| 909 | Krocan Energy Corporation | Bowling Green, KY 42102 | Oil & Gas Operator | Jul 2026 |
| 910 | Krog Partners, LLC | Kilgore, TX 75663 | Oil Operator | Jul 2026 |
| 911 | Krog, Peter L. & Kim R. | Orchard Park, NY 14127 | Gas Operator | Dec 2025 |
| 912 | Kroh Operating LLC | River Oaks, TX 76114 | Oil & Gas Operator | Jul 2026 |
| 913 | Kroll Energy LLC | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2025 |
| 914 | Krot Oil Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2026 |
| 915 | Krotje, Dorothy C. | Franklinville, NY 14737 | Gas Operator | Dec 2025 |
| 916 | Krotzer Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Apr 2026 |
| 917 | KRS Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Apr 2020 |
| 918 | Kruckenberg & SC | | Oil & Gas Operator | Sep 1993 |
| 919 | Kruckenberg & Scott | Isabel, KS 67065 | Oil Operator | Dec 2011 |
| 920 | Krueger, A. H., Jr. | Hays, KS 67601 | Oil Operator | Jul 1993 |
| 921 | Krug, Donald H | Russell, KS 67665 | Oil Operator | Mar 2026 |
| 922 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Apr 2026 |
| 923 | Krumme Wesley J | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 1997 |
| 924 | Krummrich Engineering Corporation | | Oil & Gas Operator | Apr 2026 |
| 925 | Ksabe Energy Partners, LLC | Oklahoma City, OK 73106 | Oil Operator | Jul 2026 |
| 926 | KSC Oil | | Oil Operator | Feb 2026 |
| 927 | KSM Energy Inc | Pittsburgh, PA 15238-3156 | Gas Operator | Dec 2025 |
| 928 | KST Oil & Gas Co Inc | Tallmadge, OH 44278-1142 | Oil & Gas Operator | Dec 1995 |
| 929 | Kstone Energy, LLC | Oklahoma City, OK 73106 | Oil Operator | Jul 2026 |
| 930 | KSW Operating,LLC | | Oil & Gas Operator | Mar 2015 |
| 931 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Mar 2026 |
| 932 | KT Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2026 |
| 933 | KT Operating Company LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2010 |
| 934 | KT Resources LLC | | Oil & Gas Operator | Apr 2026 |
| 935 | KTC Oil Enterprises, LLC | Dallas, TX 75247 | Oil & Gas Operator | Jul 2026 |
| 936 | KTM Operating LLC | | Oil & Gas Operator | Mar 2026 |
| 937 | KTP Energy, Inc. | Lakewood, CO 80226 | Oil & Gas Operator | Aug 2019 |
| 938 | Kudella, Ron & Cline, Russell | | Oil & Gas Operator | Feb 2021 |
| 939 | Kuehne Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 940 | Kuenzler & Flora Reserve Company | | Oil & Gas Operator | Jan 2026 |
| 941 | Kughn | | Oil Operator | Sep 2019 |
| 942 | Kugler* Dean & Joe Dba D-J Oil Company | | Oil & Gas Operator | Jul 2021 |
| 943 | Kuhn Oil Co Inc | Timber Lake, SD 57656 | Oil Operator | Dec 2025 |
| 944 | Kuhn Richard F | Baltimore, OH 43105 | Oil Operator | Dec 2022 |
| 945 | Kuhn Walter Dril | | Gas Operator | Dec 1985 |
| 946 | Kukui Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 947 | Kukui Operating Company | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 948 | Kulka And Schmidt Inc | | Oil & Gas Operator | Dec 1992 |
| 949 | Kundtz Properties Inc | Orange VIllage, OH 44122 | Gas Operator | Dec 2025 |
| 950 | Kunkel, Richard A. DDS & Susan K. | Little Valley, NY 14755 | Gas Operator | Dec 2025 |
| 951 | Kunu Energy LLC | Wichita Falls, TX 76310 | Oil Operator | Jul 2026 |
| 952 | Kuran Resources | Wichita Falls, TX 76308 | Oil Operator | Jul 2026 |
| 953 | Kuran Resources Inc | Wichita Falls, TX 76305 | Oil Operator | Jul 2021 |
| 954 | Kutter Oil Co. | Eureka, KS 67045 | Oil Operator | May 2002 |
| 955 | Kutter Oil, Inc. | Eureka, KS 67045 | Oil Operator | Mar 2022 |
| 956 | Kuykendall, IValene Estate | Electra, TX 76360 | Oil & Gas Operator | Dec 1998 |
| 957 | Kuykendall, M. C. | Electra, TX 76360 | Oil & Gas Operator | Apr 1995 |
| 958 | Kuykendall, M.C., Estate | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |
| 959 | KV Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2006 |
| 960 | KVL Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Jul 2026 |
| 961 | KWB Oil Property | | Oil Operator | Oct 1992 |
| 962 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 963 | KWB Oil Property MGMT, Inc. | | Oil & Gas Operator | Mar 1983 |
| 964 | Kwilos, Stanley | Angola, NY 14006 | Gas Operator | Dec 2025 |
| 965 | KWR Ventures LLC | Harrisburg, IL 62946 | Oil Operator | Dec 2024 |
| 966 | KWS Oil & Gas, LLC | Wink, TX 79789 | Oil & Gas Operator | Jul 2026 |
| 967 | Ky Crude LLC | Bowling Green, KY 42103 | Oil Operator | Dec 2021 |
| 968 | Ky Energy Group, LLC | | Oil & Gas Operator | Dec 2015 |
| 969 | Ky Ohio Gas Co | | Oil Operator | Dec 2021 |
| 970 | Ky Oil Co | Palco, KS 67657 | Oil & Gas Operator | Aug 2000 |
| 971 | Ky-Tenn Expl Co, Inc | New Concord, OH 43762 | Oil & Gas Operator | Dec 2024 |
| 972 | Kybenco Disposals LLC | Lindsay, OK 73052 | Oil Operator | Apr 2026 |
| 973 | Kykon Oil & Gas, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jun 2007 |
| 974 | Kykuit Resources, LLC | Winifred, MT 59489 | Gas Operator | Mar 2021 |
| 975 | Kyl-Kat Petroleum | | Oil & Gas Operator | Oct 1996 |
| 976 | Kylander Oil Inc | Warren, PA 16365-4366 | Oil & Gas Operator | Dec 2025 |
| 977 | Kyle Energy Inc NV | Apollo, PA 15613-0249 | Gas Operator | Dec 1996 |
| 978 | Kyler Oil Company | Pawhuska, OK 74056-0117 | Oil Operator | Nov 1998 |
| 979 | Kynge Energy Investments LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2026 |
| 980 | Kynosa Inc. | Levelland, TX 79336 | Oil & Gas Operator | Jun 1998 |
| 981 | Kytex, Inc. | Wichita, KS 67230 | Oil Operator | Dec 2019 |
| 982 | Kytx Oil & Gas, LLC | Gray, KY 40734 | Oil & Gas Operator | Dec 2024 |
| 983 | KZ Global Energy, LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2026 |