| 901 | KSC Oil | | Oil Operator | Dec 2023 |
| 902 | KSM Energy Inc | Pittsburgh, PA 15238-3156 | Gas Operator | Dec 2022 |
| 903 | KST Oil & Gas Co Inc | Tallmadge, OH 44278-1142-1142 | Oil & Gas Operator | Dec 1995 |
| 904 | Kstone Energy, LLC | Oklahoma City, OK 73106 | Oil Operator | May 2024 |
| 905 | KSW Operating LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 906 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Jan 2024 |
| 907 | KT Investments Inc | Englewood, FL 34223 | Oil & Gas Operator | Feb 2024 |
| 908 | KT Operating Company LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2010 |
| 909 | KT Resources LLC | | Oil & Gas Operator | Mar 2024 |
| 910 | KTC Oil Enterprises, LLC | Dallas, TX 75247 | Oil & Gas Operator | May 2024 |
| 911 | KTP Energy, Inc. | Denver, CO 80226 | Oil & Gas Operator | Aug 2019 |
| 912 | Kudella, Ron & Cline, Russell | | Oil & Gas Operator | Feb 2021 |
| 913 | Kuehne Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 914 | Kuenzler & Flora Reserve Company | | Oil Operator | Feb 2024 |
| 915 | Kughn | | Oil Operator | Sep 2019 |
| 916 | Kugler* Dean & Joe Dba D-J Oil Company | | Oil & Gas Operator | Sep 2019 |
| 917 | Kuhn Oil Co Inc | Timber Lake, SD 57656 | Oil Operator | Dec 2023 |
| 918 | Kuhn Richard F | Baltimore, OH 43105 | Oil Operator | Dec 2022 |
| 919 | Kuhn Walter Dril | | Gas Operator | Dec 1985 |
| 920 | Kukui Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 921 | Kukui Operating Company | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 922 | Kulka And Schmidt Inc | | Oil & Gas Operator | Dec 1992 |
| 923 | Kunkel, Richard A. DDS & Susan K. | Little Valley, NY 14755 | Gas Operator | Dec 2022 |
| 924 | Kunu Energy LLC | Wichita Falls, TX 76308 | Oil Operator | May 2024 |
| 925 | Kuran Resources | Wichita Falls, TX 76305 | Oil Operator | May 2024 |
| 926 | Kuran Resources Inc | | Oil Operator | Jul 2021 |
| 927 | Kurz Production Co | Somerset, TX 78069 | Oil & Gas Operator | May 2012 |
| 928 | Kutter Oil Co. | Eureka, KS 67045 | Oil Operator | May 2002 |
| 929 | Kutter Oil, Inc. | Eureka, KS 67045 | Oil Operator | Mar 2022 |
| 930 | Kuykendall, IValene Estate | Electra, TX 76360 | Oil & Gas Operator | Dec 1998 |
| 931 | Kuykendall, M. C. | Electra, TX 76360 | Oil & Gas Operator | Apr 1995 |
| 932 | Kuykendall, M.C., Estate | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |
| 933 | KV Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2006 |
| 934 | KVL Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 935 | KWB Oil Property | | Oil Operator | Oct 1992 |
| 936 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 937 | Kwilos, Stanley | Angola, NY 14006 | Gas Operator | Dec 2022 |
| 938 | KWR Ventures LLC | Harrisburg, IL 62946 | Oil Operator | Dec 2021 |
| 939 | KWS Oil & Gas, LLC | El Campo, TX 77437 | Oil & Gas Operator | May 2024 |
| 940 | Ky Crude LLC | Bowling Green, KY 42103 | Oil Operator | Dec 2021 |
| 941 | Ky Energy Group, LLC | | Oil & Gas Operator | Dec 2015 |
| 942 | Ky Ohio Gas Co | | Oil Operator | Dec 2021 |
| 943 | Ky Oil Co | Palco, KS 67657 | Oil & Gas Operator | Aug 2000 |
| 944 | Ky-Tenn Expl Co, Inc | New Concord, OH 43762 | Oil & Gas Operator | Dec 2020 |
| 945 | Kybenco Disposals LLC | | Oil Operator | Sep 2022 |
| 946 | Kykon Oil & Gas, Inc. | Billings, MT 59103 | Oil & Gas Operator | Feb 2009 |
| 947 | Kykuit Resources, LLC | Winifred, MT 59489 | Gas Operator | Mar 2021 |
| 948 | Kyl-Kat Petroleum | | Oil & Gas Operator | Oct 1996 |
| 949 | Kylander Oil Inc | | Oil & Gas Operator | Dec 2023 |
| 950 | Kyle Energy Inc NV | Apollo, PA 15613-0249 | Gas Operator | Dec 1996 |
| 951 | Kyler Oil Company | Pawhuska, OK 74056-0117 | Oil Operator | Nov 1998 |
| 952 | Kynge Energy Investments LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 953 | Kynosa Inc. | Levelland, TX 79336 | Oil & Gas Operator | Jun 1998 |
| 954 | Kytex, Inc. | Wichita, KS 67230 | Oil Operator | Dec 2019 |
| 955 | Kytx Oil & Gas, LLC | Gray, KY 40734 | Oil & Gas Operator | Dec 2021 |
| 956 | KZ Global Energy, LLC | Houston, TX 77042 | Oil & Gas Operator | May 2024 |