| 7001 | Cycle Oil & Gas Inc. | Katy, TX 77449 | Oil Operator | Aug 2026 |
| 7002 | Cycle Oil & Gas LTD | | Gas Operator | Apr 2026 |
| 7003 | Cyclone Exploration, Inc. | Florence, CO 81226 | Oil & Gas Operator | Aug 2026 |
| 7004 | Cyclone Petroleu | | Oil & Gas Operator | Nov 1995 |
| 7005 | Cyclone Petroleum, Incorporated | Jenks, OK 74037 | Oil & Gas Operator | Apr 2026 |
| 7006 | Cyclops Corp | Pittsburgh, PA 15228 | Oil & Gas Operator | Dec 1992 |
| 7007 | Cygnus Producing Corporation | | Oil & Gas Operator | Feb 1990 |
| 7008 | Cymri Corporation, The | Houston, TX 77057 | Oil & Gas Operator | Mar 2008 |
| 7009 | Cymri, L.L.C. | Houston, TX 77042 | Oil & Gas Operator | Aug 2026 |
| 7010 | Cynpat Oil & Gas, Inc. | Sulphur SPGS, TX 75482 | Oil Operator | Nov 2018 |
| 7011 | Cypress Creek Production Company | Magnolia, AR 71753 | Oil Operator | Jan 2025 |
| 7012 | Cypress E & P Corporation | Leander, TX 78646 | Oil & Gas Operator | Sep 2016 |
| 7013 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Feb 2026 |
| 7014 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 7015 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 7016 | Cypress Oil Company, Inc. | | Oil & Gas Operator | Aug 2003 |
| 7017 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2026 |
| 7018 | Cypress Partners, Inc. | Houston, TX 77068 | Oil & Gas Operator | May 1999 |
| 7019 | Cypress Production, Inc. | Azle, TX 76020 | Oil & Gas Operator | Aug 2026 |
| 7020 | Cypress Resources | | Oil & Gas Operator | Jul 2004 |
| 7021 | Cyrus, Wade T | Fort Gay, WV 25574 | Oil & Gas Operator | Dec 2013 |
| 7022 | Cytex South Texas Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2026 |
| 7023 | Czar Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Oct 1992 |
| 7024 | Czarniak, Dennis G. | Holland, NY 14080 | Gas Operator | Dec 2025 |
| 7025 | Czerniak, Michael A. And Cheryl A. | Lakewood, NY 14750 | Gas Operator | Dec 2025 |
| 7026 | Czesak Dairy Farm, LLC | Chaffee, NY 14030 | Gas Operator | Dec 2025 |
| 7027 | Czworka, Terry D. | Le Roy, NY 14482 | Gas Operator | Dec 2025 |
| 7028 | D & A Oil Company | Abilene, TX 79606 | Oil & Gas Operator | Oct 2018 |
| 7029 | D & A Oil Company, A General Partnership | Clearwater, KS 67026 | Oil Operator | Nov 2025 |
| 7030 | D & B Energy Corporation | San Antonio, TX 78264 | Oil Operator | Aug 2026 |
| 7031 | D & B Gas Co. | Burden, KS 67019 | Gas Operator | Feb 2001 |
| 7032 | D & B Gas Prod LLC | Kittanning, PA 16201-7123 | Oil & Gas Operator | Dec 2025 |
| 7033 | D & B Johnson Family LLC | Owasso, OK 74055-7578 | Oil Operator | Apr 2025 |
| 7034 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | Aug 2026 |
| 7035 | D & B Operating LLC | Ringwood, OK 73768 | Oil Operator | Jan 2023 |
| 7036 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 7037 | D & C Operating, Inc. | | Oil & Gas Operator | Apr 1999 |
| 7038 | D & D Contract Pumping Inc | Casper, WY 82604 | Oil Operator | Jun 2026 |
| 7039 | D & D Drilling | Kingston, OK 73439-9549 | Oil & Gas Operator | May 2000 |
| 7040 | D & D DRLG Co & Saye Oil Co | | Oil Operator | Apr 1982 |
| 7041 | D & D Energy | | Oil Operator | Jul 2023 |
| 7042 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 7043 | D & D Enterprises | Post, TX 79356 | Oil & Gas Operator | Aug 2026 |
| 7044 | D & D Expl Co-Mba Energy | | Oil Operator | Nov 1985 |
| 7045 | D & D Exploration Co. | | Oil & Gas Operator | Nov 1986 |
| 7046 | D & D Exploration Co. Et Al | | Oil Operator | Feb 1988 |
| 7047 | D & D Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2025 |
| 7048 | D & D Oil Co. #2 | Post, TX 79356 | Oil & Gas Operator | Aug 2026 |
| 7049 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Aug 2026 |
| 7050 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 7051 | D & D Services | Cement, OK 73017-9712 | Oil Operator | Feb 2017 |
| 7052 | D & D Well Service, L.L.C. | Post, TX 79356 | Oil Operator | Aug 2026 |
| 7053 | D & E Oil Co. | Perryton, TX 79070 | Oil & Gas Operator | Aug 2026 |
| 7054 | D & F Oil Company | Dewey, OK 74029 | Oil & Gas Operator | Apr 2001 |
| 7055 | D & F Petroleum | | Oil & Gas Operator | Sep 1990 |
| 7056 | D & G Company | Iraan, TX 79744 | Oil Operator | Apr 2006 |
| 7057 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 7058 | D & G Natural Resources Inc | Somerset, KY 42502 | Oil & Gas Operator | Dec 2024 |
| 7059 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 7060 | D & G Oil Compan | | Oil Operator | Mar 1988 |
| 7061 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2026 |
| 7062 | D & H Energy, LLC | Shelby, MT 59474 | Oil & Gas Operator | Apr 2026 |
| 7063 | D & H Investments | Jacksboro, TX 76458 | Oil & Gas Operator | Aug 2026 |
| 7064 | D & H Oil | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2022 |
| 7065 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 7066 | D & H Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2024 |
| 7067 | D & J Investment | | Oil Operator | Jun 1995 |
| 7068 | D & J Investments | | Oil Operator | Dec 2009 |
| 7069 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Aug 2026 |
| 7070 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 7071 | D & J Producing Company | | Oil Operator | Sep 2006 |
| 7072 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | May 2026 |
| 7073 | D & K Supply Inc | East Canton, OH 44730 | Oil & Gas Operator | Dec 2002 |
| 7074 | D & L Energy | Morland, KS 67650 | Oil Operator | Mar 1995 |
| 7075 | D & L Energy Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2016 |
| 7076 | D & L Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Nov 2022 |
| 7077 | D & L Operating LLC | Morris, OK 74445 | Oil & Gas Operator | Apr 2026 |
| 7078 | D & L Partnership | Rhome, TX 76078 | Oil Operator | May 1987 |
| 7079 | D & M Company | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2008 |
| 7080 | D & M Enterprises Inc | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1991 |
| 7081 | D & M Oil, Inc. | Winfield, KS 67156 | Oil Operator | Apr 2001 |
| 7082 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | May 2026 |
| 7083 | D & M Welding LLC | Kevin, MT 59454 | Oil & Gas Operator | Jun 2026 |
| 7084 | D & N Oil Co. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 7085 | D & N Operating Corp | Belpre, OH 45714-8181 | Oil & Gas Operator | Dec 2019 |
| 7086 | D & P Operating & Prod. Corp. | Cedar Park, TX 78613 | Oil & Gas Operator | Dec 2003 |
| 7087 | D & P Tank Service, Inc. | | Oil Operator | Mar 2000 |
| 7088 | D & R Energy | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 7089 | D & R Enterprises | Eastland, TX 76448 | Oil & Gas Operator | Oct 2020 |
| 7090 | D & R Oil Properties | | Oil Operator | May 1998 |
| 7091 | D & R Oil, Inc. | Galva, KS 67443 | Oil & Gas Operator | May 2023 |
| 7092 | D & R Well Service, Inc. | Galva, KS 67443 | Oil & Gas Operator | Mar 2026 |
| 7093 | D & S Energy Corp | | Oil & Gas Operator | Dec 2018 |
| 7094 | D & S Oil Co. #1 | Borger, TX 79007 | Oil & Gas Operator | Aug 2026 |
| 7095 | D & S Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Aug 2026 |
| 7096 | D & S Operating | Texhoma, OK 73949 | Oil & Gas Operator | May 2001 |
| 7097 | D & T Company | | Oil & Gas Operator | Jun 1983 |
| 7098 | D & T Oil | Bremen, OH 43107 | Oil & Gas Operator | Dec 2011 |
| 7099 | D & T Oil Company | Hays, KS 67601 | Oil Operator | Oct 2025 |
| 7100 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Dec 2025 |