| 701 | KLD Energy | | Oil & Gas Operator | Dec 2015 |
| 702 | Kleen Oilfield Services Co | Velma, OK 73491-0178 | Oil & Gas Operator | Sep 2024 |
| 703 | Kleese Development Associates | Youngstown, OH 44514 | Oil & Gas Operator | Dec 2023 |
| 704 | Klein Oil & Logging | Alma, NY 14708 | Oil & Gas Operator | Dec 2023 |
| 705 | Klein, J. L. | Henrietta, TX 76365 | Oil & Gas Operator | Sep 2013 |
| 706 | Klenda, John | Marion, KS 66861 | Gas Operator | Dec 2023 |
| 707 | KLH Oil & Gas, Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Nov 2024 |
| 708 | Klima Oil, Inc. | Great Bend, KS 67530 | Oil Operator | Dec 2009 |
| 709 | Klima Well Servi | | Oil Operator | Dec 1996 |
| 710 | Klima Well Service, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Jun 2024 |
| 711 | Klimko, Nathan J. | Attica, NY 14011 | Gas Operator | Dec 2023 |
| 712 | Kling, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Dec 2000 |
| 713 | Klingberg, Roger | Cross Plains, TX 76443 | Oil & Gas Operator | Jan 2017 |
| 714 | Klinger Energy Inc | Ponca City, OK 74601-7812 | Oil & Gas Operator | Oct 2019 |
| 715 | Klinger Shirley | Ponca City, OK 74601-7812 | Oil & Gas Operator | Aug 2024 |
| 716 | Klingler Automatic Industries Inc | | Oil & Gas Operator | Jun 2024 |
| 717 | Klippel, B.W., Jr. | Wichita, KS 67220 | Oil Operator | May 1999 |
| 718 | KLJ Inc | Graysville, OH 45734 | Oil & Gas Operator | Dec 2002 |
| 719 | KLM Exploration Company, Inc. | McLouth, KS 66054 | Oil Operator | Dec 2019 |
| 720 | KLM Oil & Gas Company | Tonganoxie, KS 66086 | Oil & Gas Operator | Apr 2014 |
| 721 | KLM Oil Operations, Inc. | El Dorado, KS 67042 | Oil Operator | Apr 1998 |
| 722 | KLM Operating | | Oil & Gas Operator | Jul 2024 |
| 723 | KLM Petroleum Corp. | Midland, TX 79705 | Oil & Gas Operator | Nov 2024 |
| 724 | KLMKH Inc | Charlotte, NC 28270 | Oil Operator | Jun 2023 |
| 725 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Sep 2024 |
| 726 | Klo Oil & Gas, L.L.C. | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2023 |
| 727 | Kloberdanz Paul | | Gas Operator | Apr 1991 |
| 728 | Kloberdanz, Paul E. | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2021 |
| 729 | Klock, Carol H. | Auburn, NY 13021 | Gas Operator | Dec 2023 |
| 730 | Klock, Ted | Corsicana, TX 75110 | Oil Operator | Jul 2022 |
| 731 | Klondike Investments, Inc. | Paola, KS 66071 | Oil Operator | Sep 2011 |
| 732 | Klosinski, David | Cattaraugus, NY 14719 | Gas Operator | Dec 2023 |
| 733 | Klotzman, M. S. Exploration Co. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2024 |
| 734 | KLS, Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jun 2024 |
| 735 | KLT Gas Inc | Woodlands, TX 77380 | Oil & Gas Operator | Sep 2004 |
| 736 | Klug, E A & A J (Estate) | Proctor, WV 26055-0000 | Oil & Gas Operator | Dec 2021 |
| 737 | Klutts, Carlos J. | Austin, TX 78711 | Oil & Gas Operator | Apr 2002 |
| 738 | KMD Operating Company LLC | | Oil & Gas Operator | Dec 2015 |
| 739 | Kmfad Oil And Gas LLC | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2023 |
| 740 | Kmi Continental Off. Prod. Co. | | Oil & Gas Operator | Jan 1988 |
| 741 | KMK Oil & Gas, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Nov 2024 |
| 742 | KMP Operating Inc. | | Oil Operator | Sep 2024 |
| 743 | KMV Consulting Inc | Winston Salem, NC 27101-2561 | Gas Operator | Dec 2012 |
| 744 | KN Production Co. | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2003 |
| 745 | Knaup, Harry J. & Lucille | Shelby, MT 59474 | Oil Operator | Oct 2023 |
| 746 | KND Oil & Gas, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2023 |
| 747 | Kneupper Oil, LLC | MC Camey, TX 79752 | Oil & Gas Operator | Nov 2024 |
| 748 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 749 | Knickerbocker Land Resources | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2015 |
| 750 | Knife Oil Company Inc | Cushing, OK 74023-1347 | Oil & Gas Operator | Aug 2000 |
| 751 | Knife River Oil, LLC | Bull Shoals, AR 72619 | Oil Operator | Feb 2017 |
| 752 | Knight Casing Pulling Company | | Oil Operator | Jun 1989 |
| 753 | Knight Energy Inc | Tulsa, OK 74104 | Oil Operator | Sep 2024 |
| 754 | Knight Exploration, Inc. | | Oil & Gas Operator | Sep 1989 |
| 755 | Knight Oil Company | Victoria, KS 67671 | Gas Operator | Jul 2024 |
| 756 | Knight Resources LLC | | Oil & Gas Operator | Dec 2013 |
| 757 | Knight Resources, Inc. | | Oil & Gas Operator | Dec 2011 |
| 758 | Knight, Joeann | Kilgore, TX 75662 | Oil Operator | Sep 1989 |
| 759 | Knight, Michael L. | Ripley, NY 14775 | Gas Operator | Dec 2023 |
| 760 | Knight, Reuben B. | Windthorst, TX 76389 | Oil & Gas Operator | Nov 2024 |
| 761 | Knight, Wilbur H. Et Al | | Oil & Gas Operator | Jul 1991 |
| 762 | Knighton Oil Com | | Oil & Gas Operator | Nov 1996 |
| 763 | Knighton Oil Company, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jul 2024 |
| 764 | Knightsbridge Petroleum Corp. | | Oil Operator | Jul 1991 |
| 765 | KNK Oil & Gas | Abilene, TX 79602 | Oil & Gas Operator | Dec 1996 |
| 766 | Knobler, Alfred E | | Oil & Gas Operator | Dec 2003 |
| 767 | Knobloch, Albert | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 768 | Knotts Brothers | Orma, WV 25268-0000 | Oil & Gas Operator | Dec 2021 |
| 769 | Knox Energy Inc | Pataskala, OH 43062 | Oil & Gas Operator | Dec 2023 |
| 770 | Knox Industries, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Nov 2024 |
| 771 | Knox, D. M., Oil Co. | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2000 |
| 772 | Knox, H. A. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 773 | Knox, Jack L. | Coleman, TX 76834 | Oil & Gas Operator | Nov 2024 |
| 774 | Knutson Production Company | Loco, OK 73442-9706 | Oil & Gas Operator | Aug 2024 |
| 775 | Ko Operating | Merkel, TX 79536 | Oil & Gas Operator | Nov 2024 |
| 776 | Ko Operating LLC | Plano, TX 75025 | Oil Operator | Nov 2024 |
| 777 | Kobar Corporation | Riverton, WY 82501 | Gas Operator | Dec 1996 |
| 778 | Koby Oil Company LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2024 |
| 779 | Kocana Resources | Ranchos Taos, NM 87557 | Oil & Gas Operator | Jul 1999 |
| 780 | Koch Exploration | | Oil & Gas Operator | Oct 1988 |
| 781 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Jul 2024 |
| 782 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 783 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 784 | Koch Hydrocarbon Company | Wichita, KS 67220-3203 | Oil & Gas Operator | Nov 2014 |
| 785 | Koch Midstream Services Company | Wichita, KS 67201 | Oil & Gas Operator | Oct 2000 |
| 786 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 787 | Koch Production Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2002 |
| 788 | Koch, P. S. | Seguin, TX 78155 | Oil & Gas Operator | May 2018 |
| 789 | Kocher And Westfall | Middlebourne, WV 26149 | Oil Operator | Dec 2021 |
| 790 | Koda Operating LLC | Tyler, TX 75703-5596 | Oil & Gas Operator | Aug 2024 |
| 791 | Koda Resources Operating, LLC | | Oil & Gas Operator | Sep 2024 |
| 792 | Kodiak Drilling, Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2003 |
| 793 | Kodiak Energy LLC | Pineville, MO 64856 | Oil Operator | Dec 2019 |
| 794 | Kodiak Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2020 |
| 795 | Kodiak Oil & Gas Exploration Inc | Oklahoma City, OK 73134-1046 | Oil & Gas Operator | Aug 2024 |
| 796 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Nov 2024 |
| 797 | Kodiak Oil Co. | Stockton, MO 65785 | Oil Operator | May 1996 |
| 798 | Kodiak Operating, L.L.C. | Olney, TX 76374 | Oil & Gas Operator | Nov 2024 |
| 799 | Kodiak Petroleum Corp. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 1996 |
| 800 | Kodiak Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jul 2024 |