| 101 | Knight Casing Pulling Company | | Oil Operator | Jun 1989 |
| 102 | Knight Exploration, Inc. | | Oil & Gas Operator | Sep 1989 |
| 103 | Knight Resources LLC | | Oil & Gas Operator | Dec 2013 |
| 104 | Knight Resources, Inc. | | Oil & Gas Operator | Dec 2011 |
| 105 | Knightsbridge Petroleum Corp. | | Oil Operator | Jul 1991 |
| 106 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 107 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 108 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 109 | Konantz, Inc. | | Oil & Gas Operator | Jan 1995 |
| 110 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 111 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 112 | Kraker Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1995 |
| 113 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 114 | Kriti Te Energy, Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 2017 |
| 115 | KV Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2006 |
| 116 | KWB Oil Property MGMT, Inc. | | Oil & Gas Operator | Mar 1983 |
| 117 | Kykon Oil & Gas, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jun 2007 |
| 118 | Kyl-Kat Petroleum | | Oil & Gas Operator | Oct 1996 |