| 18701 | McGown Drilling, Inc. | Mound City, KS 66056 | Oil Operator | Feb 2025 |
| 18702 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | Feb 2025 |
| 18703 | McGriff Craig Exploration Inc | Oklahoma City, OK 73172-0364 | Oil & Gas Operator | Mar 2023 |
| 18704 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Jun 2025 |
| 18705 | McGuffin, Joe S. Inc. | Mathis, TX 78368 | Gas Operator | Jun 2025 |
| 18706 | McGuire Brothers | Phoenix, AZ 85045 | Oil & Gas Operator | Jun 2025 |
| 18707 | McGuire John C | Gillette, WY 82717 | Oil & Gas Operator | Oct 2005 |
| 18708 | McGuire Tom Oil Company | Depew, OK 74028 | Oil Operator | Apr 2011 |
| 18709 | McIlhenny-Powell Operating Co | | Gas Operator | Aug 1983 |
| 18710 | McIlvain Oil LLC | Madison, KS 66860 | Oil Operator | Dec 2017 |
| 18711 | McIntosh Oil & Gas, Inc. | Coalton, WV 26257 | Oil & Gas Operator | Dec 2021 |
| 18712 | McIntyre M L | Oklahoma City, OK 73154-0523 | Oil & Gas Operator | Jul 1996 |
| 18713 | McIntyre Oil Company | | Oil & Gas Operator | Jan 1992 |
| 18714 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Jun 2025 |
| 18715 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 18716 | McKay Oil | Portales, NM 88130 | Oil & Gas Operator | Apr 1996 |
| 18717 | McKay Oil & Gas LLC | Albuquerque, NM 87191 | Gas Operator | Mar 2020 |
| 18718 | McKay Oil Company | Perry, OK 73077 | Oil Operator | Nov 2008 |
| 18719 | McKay Oil Corp | Roswell, NM 88202 | Oil & Gas Operator | Aug 2017 |
| 18720 | McKay Operating LLC | Lubbock, TX 79416 | Oil & Gas Operator | Oct 2023 |
| 18721 | McKean Bros. | | Oil & Gas Operator | Dec 1997 |
| 18722 | McKee Don Drill Co Inc | Newark, OH 43058 | Oil & Gas Operator | Dec 2012 |
| 18723 | McKee Energy Comapny Inc | | Oil & Gas Operator | Apr 2011 |
| 18724 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 18725 | McKeever, Tyra, Swenson Venture | Stamford, TX 79553 | Oil & Gas Operator | Apr 1996 |
| 18726 | McKellpee Energy Corp. | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 18727 | McKelvy A D Oil | | Gas Operator | Feb 1995 |
| 18728 | McKenna Oil Co | Kane, PA 16735-9711 | Oil & Gas Operator | Dec 2004 |
| 18729 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 18730 | McKenzie & Assoc. | | Gas Operator | Dec 1990 |
| 18731 | McKenzie Management Inc. | | Oil & Gas Operator | Aug 1989 |
| 18732 | McKenzie Methane | Houston, TX BAD ADDR | Gas Operator | Apr 1994 |
| 18733 | McKenzie Operating Company, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 18734 | McKenzie Petroleum Company | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 18735 | McKenzie Production Company | Houston, TX 77063 | Oil & Gas Operator | May 1995 |
| 18736 | McKinney Kenneth R | Okmulgee, OK 74447-6932 | Oil Operator | Aug 2000 |
| 18737 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 18738 | McKinney, Jason G. | | Oil Operator | Dec 2021 |
| 18739 | McKinney, M. H. | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 18740 | McKnight, C. L. | McLeod, TX 75565 | Oil & Gas Operator | Jun 2025 |
| 18741 | McKnight, C. L. Oil Co. LLP | McLeod, TX 75565 | Oil & Gas Operator | Jun 2025 |
| 18742 | McKnight, J. C. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2019 |
| 18743 | MCL 1 Oil & Gas Wyoming LLC | Minneapolis, MN 55402 | Oil & Gas Operator | Jul 2018 |
| 18744 | McLain Exploration, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2008 |
| 18745 | McLain J. Forman | | Oil & Gas Operator | Mar 1988 |
| 18746 | McLane Trust* Dixie | | Gas Operator | Mar 2025 |
| 18747 | McLaurin Oil Co. | | Oil Operator | Jan 2025 |
| 18748 | McLelland Engineering & MGMT. | Houston, TX 77042 | Oil & Gas Operator | Mar 1999 |
| 18749 | McLemore, Laurence | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2025 |
| 18750 | McLennan Family Properties LLP | | Oil & Gas Operator | Dec 2021 |
| 18751 | McLeod Gas Gath & Proc Co. L.L.C. | | Oil Operator | Jul 2012 |
| 18752 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 18753 | McLester Oil & G | | Oil & Gas Operator | Jun 1992 |
| 18754 | McLish & Luff | Denver, CO 80202 | Gas Operator | Nov 1972 |
| 18755 | McLish, Holmes P | Denver, CO 80202 | Oil & Gas Operator | Dec 1983 |
| 18756 | McLouth Operating Company, Inc. | Kansas City, MO 64106 | Oil Operator | Aug 1999 |
| 18757 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 18758 | MCM Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 18759 | McMahon Operating Co., L.C. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2004 |
| 18760 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 18761 | McMahon-Bullington LP | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2009 |
| 18762 | McMillan, David | FT. Worth, TX 76107 | Oil Operator | Aug 2001 |
| 18763 | McMillan, L.L.C. | Sedan, KS 67361 | Oil Operator | Dec 2019 |
| 18764 | McMillen, Clay Eugene (Gene) | Chanute, KS 66720 | Oil Operator | Aug 1997 |
| 18765 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | Mar 2025 |
| 18766 | McMinn Operating Company, Inc. | Hempstead, TX 77445 | Oil & Gas Operator | Jun 2025 |
| 18767 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 18768 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 18769 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 18770 | McMoran-Transco | | Oil & Gas Operator | Aug 1979 |
| 18771 | McMullan Oil Company | San Antonio, TX 78212 | Oil & Gas Operator | Jun 2023 |
| 18772 | McMullin Well Se | | Oil & Gas Operator | Sep 1995 |
| 18773 | McMullin, Douglas | Wellsville, KS 66092 | Oil Operator | Nov 2024 |
| 18774 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Jun 2025 |
| 18775 | McMurry Energy Company | | Oil & Gas Operator | Dec 2001 |
| 18776 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 18777 | McMurtrie Oil Inc | | Oil & Gas Operator | Feb 2025 |
| 18778 | McNallen & Griffin | Keller, TX 76244 | Oil & Gas Operator | Jun 2025 |
| 18779 | McNallen Oil Co., Inc. | Keller, TX 76244 | Oil & Gas Operator | Jun 2025 |
| 18780 | McNeal Production Inc | Perry, OK 73077-0268 | Oil & Gas Operator | Nov 2014 |
| 18781 | McNeill Randy & W R | Okmulgee, OK 74447 | Oil & Gas Operator | Nov 2013 |
| 18782 | McNeish Oil Oper | | Oil & Gas Operator | Feb 1991 |
| 18783 | McNeish Oil Operations | | Oil Operator | Nov 2019 |
| 18784 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 18785 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 18786 | McNown, Carl H. | Moline, KS 67353 | Oil Operator | Jun 2021 |
| 18787 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 18788 | McO Resources Corporation | | Oil & Gas Operator | Feb 1986 |
| 18789 | McO Resources In | | Oil & Gas Operator | Apr 1987 |
| 18790 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 18791 | McOil Montana One LLC | Vancouver, BC V6Z2W5 | Gas Operator | Jul 2024 |
| 18792 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | Mar 2025 |
| 18793 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 18794 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 18795 | McOsker Bros., Inc. | San Antonio, TX 78264 | Oil & Gas Operator | Aug 2003 |
| 18796 | McPhaul, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jun 2025 |
| 18797 | McPhearson, Richard E. | | Oil Operator | Mar 1956 |
| 18798 | McPherson Drilling | | Oil Operator | Jun 2015 |
| 18799 | McPherson Drilling Co. | | Oil Operator | Jan 1998 |
| 18800 | MCQ Natural Gas Co Inc | Leechburg, PA 15656-0594 | Gas Operator | Dec 2012 |