| 19901 | Morton Leases | Morris, OK 74445-2048 | Oil & Gas Operator | Jul 2017 |
| 19902 | Morton Leases Inc | | Oil & Gas Operator | Feb 2025 |
| 19903 | Morton Production Inc | Ada, OK 74820-2643 | Oil & Gas Operator | Sep 2014 |
| 19904 | Morton Valley Oil & Gas, Inc. | Dallas, TX 75222 | Oil & Gas Operator | Jun 2007 |
| 19905 | Morton, J. V. Oil Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Nov 1999 |
| 19906 | Mosaic Midland LLC | Dallas, TX 75367 | Oil Operator | May 2025 |
| 19907 | Mosaic Oil LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 19908 | Mosaic Pecos LLC | Dallas, TX 75367 | Oil Operator | May 2025 |
| 19909 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 19910 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 19911 | Mosbacher Production Co. | Houston, TX 77001 | Oil & Gas Operator | Aug 1984 |
| 19912 | Mosbacher, Robert-Pruet, Chesley | | Oil & Gas Operator | Dec 1983 |
| 19913 | Moseley Petroleum Corp. | | Oil & Gas Operator | Apr 1988 |
| 19914 | Moseley, J. T. | Temple, TX 76502 | Oil & Gas Operator | Sep 2008 |
| 19915 | Moses Gas, Inc. | Indore, WV 25111-0100 | Gas Operator | Dec 2018 |
| 19916 | Moses, Tom | Beaumont, TX 77702 | Oil Operator | May 2025 |
| 19917 | Mosher Gas, LLC | Knoxville, PA 16928 | Gas Operator | Dec 2023 |
| 19918 | Moskowitz Charles J | | Oil Operator | Feb 2014 |
| 19919 | Moskowitz Oil & Gas LLC | | Oil Operator | Jun 2024 |
| 19920 | Mosley Oil &Gas Inc | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 19921 | Mosman Operating, LLC | Dallas, TX 75204 | Oil Operator | May 2025 |
| 19922 | Moss Petroleum Company | Dallas, TX 75207 | Oil & Gas Operator | May 2025 |
| 19923 | Moss Properties Inc | | Oil & Gas Operator | Mar 1986 |
| 19924 | Moss SWD, LLC | Andrews, TX 79714 | Oil Operator | May 2025 |
| 19925 | Moss Ted A Operating Company | Oklahoma City, OK 73126-0187 | Oil & Gas Operator | Jun 1997 |
| 19926 | Moss William Properties Inc | Dallas, TX 75219 | Oil & Gas Operator | Apr 2014 |
| 19927 | Moss, William Corp. | Dallas, TX 75219 | Oil & Gas Operator | Oct 2002 |
| 19928 | Mossholder Drilling Co | Newark, OH 43055 | Oil Operator | Dec 1990 |
| 19929 | Mossholder Linda Dba | Newark, OH 43055 | Oil & Gas Operator | Dec 2015 |
| 19930 | Mossor, Kenneth Everett | Ellenboro, WV 26346-0057 | Oil & Gas Operator | Dec 2021 |
| 19931 | Mossor, L. E. | Harrisville, WV 26362-0000 | Oil & Gas Operator | Dec 2002 |
| 19932 | Mosthaf Edwin C And Mosthaf Levina M | | Oil Operator | Jul 2020 |
| 19933 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 19934 | Mott Energy LLC | Riverview, FL 33569-6702 | Oil & Gas Operator | Sep 2024 |
| 19935 | Mott Oil & Gas | Sugarland, TX 77478 | Oil & Gas Operator | May 2001 |
| 19936 | Mott Petroleum Corporation | Sugar Land, TX 77487 | Oil & Gas Operator | Aug 2024 |
| 19937 | Motto Energy Inc. | Normantown, WV 25267-8215 | Oil & Gas Operator | Dec 2021 |
| 19938 | Mount Chestnut Dev LLC | Butler, PA 16002-3940 | Gas Operator | Dec 2017 |
| 19939 | Mount Richard | Newark, OH 43055 | Oil Operator | Dec 2005 |
| 19940 | Mount, Thomas | North East, PA 16428 | Gas Operator | Dec 2023 |
| 19941 | Mountain Creek Energy Inc | Georgetown, TX 78633 | Oil & Gas Operator | Feb 2025 |
| 19942 | Mountain Creek Oil Company, Inc. | Saint Jo, TX 76265 | Oil & Gas Operator | May 2025 |
| 19943 | Mountain Divide, LLC | | Oil & Gas Operator | Mar 2017 |
| 19944 | Mountain DRLG, Inc | Hindman, KY 41822 | Oil & Gas Operator | Dec 2023 |
| 19945 | Mountain Fuel Supply Co | Salt Lake City, UT 84139 | Oil & Gas Operator | May 1984 |
| 19946 | Mountain Hawk Energy LLC | Athens, TX 75751 | Gas Operator | Jan 2015 |
| 19947 | Mountain Oil And Gas Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Feb 2025 |
| 19948 | Mountain Pacific General Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2022 |
| 19949 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2016 |
| 19950 | Mountain Resource Corporation | Salt Lake City, UT 84124 | Oil & Gas Operator | Dec 1988 |
| 19951 | Mountain State Oil Company, L..L.C. | Pennsboro, WV 26415-0014 | Oil & Gas Operator | Dec 2021 |
| 19952 | Mountain State Well Tending | Hurricane, WV 25526-0000 | Oil & Gas Operator | Dec 2021 |
| 19953 | Mountain States Petroleum Corp | Midland, TX 79702 | Oil & Gas Operator | Apr 2008 |
| 19954 | Mountain States Resources Inc | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2000 |
| 19955 | Mountain V Oil & Gas, Inc. | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 19956 | Mountain V, LLC | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 19957 | Mountain VIew Resources LLC | | Oil & Gas Operator | Mar 2025 |
| 19958 | Mountaineer Gas Transmission, Inc. | Fort Worth, TX 76185-0000 | Oil & Gas Operator | Dec 2021 |
| 19959 | Mountaineer State Energy, Inc. | Dallas, TX 75234 | Oil & Gas Operator | Dec 2021 |
| 19960 | Mountaineer State Operations, LLC | Sandyville, WV 25275 | Oil & Gas Operator | Dec 2024 |
| 19961 | Mountaineer Trading Company, LLC | Charleston, WV 25314 | Oil & Gas Operator | Dec 2016 |
| 19962 | Mourning James & Carol | Middleport, OH 45760-1214-1214 | Gas Operator | Dec 2023 |
| 19963 | Mowata Oil Company | Victoria, TX 77903 | Oil & Gas Operator | Oct 1996 |
| 19964 | Mowdy Robert F | Coalgate, OK 74538 | Oil & Gas Operator | May 2001 |
| 19965 | Moxy Oil Company | Seguin, TX 78155 | Oil & Gas Operator | Aug 2003 |
| 19966 | Moy, Gary | Falls City, TX 78113 | Oil & Gas Operator | Nov 1998 |
| 19967 | Moylan, Jimmie C. | Eastland, TX 76448 | Oil & Gas Operator | May 2025 |
| 19968 | Moylan, Thomas F. | Lacygne, KS 66040 | Oil & Gas Operator | Dec 1993 |
| 19969 | Mozark Corporation | Spring, TX 77379-8049 | Oil & Gas Operator | Jan 2011 |
| 19970 | Moze Inc | Ochelata, OK 74051 | Oil & Gas Operator | Jan 2001 |
| 19971 | MPG Petroleum | San Antonio, TX 78217 | Oil & Gas Operator | Aug 2003 |
| 19972 | MPG Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 19973 | Mr NM Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 19974 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 19975 | MRD Nowata LLC | Woodstock, GA 30189 | Oil Operator | Aug 2017 |
| 19976 | MRD Operating LLC | | Oil & Gas Operator | Dec 2016 |
| 19977 | MRD Operating LLC (Delaware) | Houston, TX 77010 | Oil & Gas Operator | Jul 2015 |
| 19978 | Mri Ventures, Inc. | | Oil Operator | Dec 1993 |
| 19979 | Mroz Baier, Christine | Memphis, TN 38120 | Gas Operator | Dec 2023 |
| 19980 | MRR Oil Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2002 |
| 19981 | Mrs. C. M. Roberson | | Oil Operator | Mar 1989 |
| 19982 | Mrs. Cecile Andries & Sons | | Oil Operator | Dec 2006 |
| 19983 | Mrs. Clara B. Guthrie | | Gas Operator | Jun 1996 |
| 19984 | MRT Exploration Co | | Oil & Gas Operator | Feb 1983 |
| 19985 | MS Producing LLC | Creston, OH 44217 | Oil & Gas Operator | Dec 2024 |
| 19986 | MS United, LLC | | Oil & Gas Operator | Oct 2024 |
| 19987 | MSB Operating | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 19988 | MSB Operating Company | Enid, OK 73703 | Oil & Gas Operator | Jan 2005 |
| 19989 | MSD Energy, Inc | Rapid City, SD 57702 | Oil & Gas Operator | Dec 2020 |
| 19990 | MSD Operating, LLC | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 19991 | Mse Operating Corp. | Beaverton, OR 97008 | Oil & Gas Operator | May 2025 |
| 19992 | MSG Resources Inc. | Iola, KS 66749 | Oil Operator | Jan 2025 |
| 19993 | MSL Oil & Gas Corp | Bradford, PA 16701-0151 | Oil & Gas Operator | Dec 2024 |
| 19994 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | May 2025 |
| 19995 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 19996 | MSSK Consulting LLC | San Antonio, TX 78253 | Oil Operator | May 2025 |
| 19997 | MT Dora Energy Corporation | Duncan, OK 73533-1829 | Oil & Gas Operator | Apr 2014 |
| 19998 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 19999 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | May 2025 |
| 20000 | MT Savage Refractories | Pittsburgh, PA 15206-0171 | Gas Operator | Dec 2021 |