| 901 | McCormick, Terrance & Anne | Andover, NY 14806 | Oil & Gas Operator | Dec 2024 |
| 902 | McCormick-Bintliff | | Oil & Gas Operator | Feb 1984 |
| 903 | McCormick-Bintliff-Pettit | | Oil & Gas Operator | Feb 1984 |
| 904 | McCormick-Ciroco, Inc. | | Oil & Gas Operator | Jan 1984 |
| 905 | McCormick-Terra-Bintliff | | Oil & Gas Operator | Dec 1979 |
| 906 | McCormick-WHB | | Gas Operator | Jan 1984 |
| 907 | McCort Brian L | Malaga, OH 43757 | Oil & Gas Operator | Dec 2025 |
| 908 | McCown Engineering | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2026 |
| 909 | McCoy Alex W & Associates | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2009 |
| 910 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 911 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Feb 2026 |
| 912 | McCoy Production | El Dorado, KS 67042 | Oil Operator | Dec 2019 |
| 913 | McCoy, Jon | Erie, KS 66733 | Oil Operator | Dec 2025 |
| 914 | McCracken Energy Services, LLC | Bradford, PA 16701 | Oil & Gas Operator | Dec 2024 |
| 915 | McCracken Oil & Gas, LLC | Bradford, PA 16701 | Oil & Gas Operator | Dec 2024 |
| 916 | McCracken, Carl A. III | | Oil & Gas Operator | Dec 2012 |
| 917 | McCracken, Cory | Bradford, PA 16701 | Oil & Gas Operator | Dec 2024 |
| 918 | McCracken, H. L. Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 919 | McCrary & Franklin, Inc. | Post, TX 79356 | Oil & Gas Operator | May 2012 |
| 920 | McCrary Oil Company, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Sep 2019 |
| 921 | McCraw Family Limited Partnership (The) | Konawa, OK 74849-5616 | Oil & Gas Operator | Feb 2026 |
| 922 | McCrea Exploration Company, Inc. | Carrollton, TX 75007 | Oil & Gas Operator | Nov 1995 |
| 923 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Mar 2026 |
| 924 | McCulliss Resource Company Inc | Denver, CO 80202 | Oil & Gas Operator | Jun 1999 |
| 925 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 926 | McCulloch Geothermal Corporation | | Oil & Gas Operator | Jun 1982 |
| 927 | McCulloch Oil Corp Of Ca | | Oil & Gas Operator | May 1980 |
| 928 | McCulloch Oil Corp.-Ids | | Oil & Gas Operator | Dec 1981 |
| 929 | McCullough G W | Norman, OK 73072 | Oil & Gas Operator | Aug 2000 |
| 930 | McCullough, Richard F. | Pennsboro, WV 26415 | Oil & Gas Operator | Dec 2021 |
| 931 | McCurdy Energy LLC | Midland, TX 79707 | Oil Operator | Sep 2025 |
| 932 | McCurdy Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 933 | McCutchin Alma Estate | Dallas, TX 75380 | Oil & Gas Operator | May 2013 |
| 934 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Jun 2026 |
| 935 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 936 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 937 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Jun 2026 |
| 938 | McDaniel Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Jun 2026 |
| 939 | McDaniel Oil Holdings, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Jun 2026 |
| 940 | McDaniel Petroleum Company, Inc. | | Oil Operator | Jun 2020 |
| 941 | McDaniel, Willard | Iraan, TX 79744 | Oil & Gas Operator | Nov 2004 |
| 942 | McDaniel, Willard Jr. Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Mar 2005 |
| 943 | McDay Energy Corp. | Plano, TX 75024 | Oil & Gas Operator | Jun 2026 |
| 944 | McDe Energy Company Inc | Enid, OK 73706 | Oil & Gas Operator | May 2009 |
| 945 | McDonald & Johnson Resources,LLC | Cypress, TX 77429 | Oil & Gas Operator | Dec 2010 |
| 946 | McDonald & Pomeroy Operating Co. | Pasadena, TX 77506 | Oil & Gas Operator | Aug 2003 |
| 947 | McDonald Dale E | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2025 |
| 948 | McDonald Energy, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Jun 2026 |
| 949 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 950 | McDonald Production, LLC | Lubbock, TX 79408 | Oil Operator | Jun 2026 |
| 951 | McDonald Ranch Partnership | | Oil Operator | Dec 2025 |
| 952 | McDonald Resources, LLC | Jefferson, TX 75657 | Oil & Gas Operator | Jun 2026 |
| 953 | McDonald, Joe | Burkburnett, TX 76354 | Oil & Gas Operator | Aug 1995 |
| 954 | McDonald, R. A. Oil Co. | Borger, TX 79008 | Oil & Gas Operator | Oct 2002 |
| 955 | McDonald, Richard A. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Jun 2026 |
| 956 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 957 | McDowell And Cook, Inc. | | Oil Operator | Jan 1987 |
| 958 | McDowell Ranch | Shamrock, TX 79079 | Gas Operator | Jun 2026 |
| 959 | McElroy John | Sapulpa, OK 74066-6119 | Oil & Gas Operator | Feb 2026 |
| 960 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 961 | McElvain Oil & Gas Properties Inc | Denver, CO 80265-2080 | Oil & Gas Operator | Jul 2011 |
| 962 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 963 | McEuen, Billy Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Dec 2016 |
| 964 | McEver Oil Company Inc. | Austin, TX 78789 | Oil & Gas Operator | Mar 2008 |
| 965 | MCF Co. | | Oil & Gas Operator | Dec 2011 |
| 966 | McFadden Energy TX, LLC | Lakewood, NY 14750 | Oil Operator | Jun 2026 |
| 967 | McFadden Oil Co. | | Oil Operator | Feb 2026 |
| 968 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Jun 2026 |
| 969 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 970 | McFerran Operating LLC | Seminole, OK 74868-6202 | Oil & Gas Operator | Mar 2026 |
| 971 | MCG Oil & Gas Operating, LLC | Archer City, TX 76351 | Oil & Gas Operator | Sep 2023 |
| 972 | McGee Drilling Corporation | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 973 | McGee, Tom Corporation | Booker, TX 79005 | Oil & Gas Operator | Feb 2026 |
| 974 | McGehee, George T. Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 1997 |
| 975 | McGhee Exploration And Prod. Co. | Houston, TX 77019 | Oil & Gas Operator | Feb 2003 |
| 976 | McGinley Jr, John R | | Gas Operator | Nov 1998 |
| 977 | McGinley P A | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1996 |
| 978 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 979 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 980 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 981 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 982 | McGoldrick & Watson | | Oil & Gas Operator | Jul 1987 |
| 983 | McGoldrick & Watson - Alagood | | Oil Operator | Oct 1995 |
| 984 | McGoldrick & Watson DRLG., Co. | | Oil & Gas Operator | Jul 1987 |
| 985 | McGoldrick & Watson, Et Al | | Oil Operator | Jul 1987 |
| 986 | McGoldrick & Watson-Walker | | Oil Operator | Jul 1987 |
| 987 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 988 | McGonagill J W | MT Gilead, OH 43338 | Oil Operator | Dec 1984 |
| 989 | McGonigal Dan L | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 990 | McGonigal Donald T | Tulsa, OK 74114-2145 | Oil & Gas Operator | Jul 2004 |
| 991 | McGonigal Ted W | Norman, OK 73072 | Oil & Gas Operator | Jan 2026 |
| 992 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 993 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Jun 2026 |
| 994 | McGowen Resources Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 995 | McGown Drilling | | Oil Operator | Apr 1993 |
| 996 | McGown Drilling, Inc. | Mound City, KS 66056 | Oil Operator | Feb 2026 |
| 997 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | Feb 2026 |
| 998 | McGriff Craig Exploration Inc | Oklahoma City, OK 73172-0364 | Oil & Gas Operator | Mar 2023 |
| 999 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Jun 2026 |
| 1000 | McGuire John C | Gillette, WY 82717 | Oil & Gas Operator | Oct 2005 |