| 1 | D & D Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2025 |
| 2 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Apr 2026 |
| 3 | D & K Supply Inc | East Canton, OH 44730 | Oil & Gas Operator | Dec 2002 |
| 4 | D & L Energy Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2016 |
| 5 | D & M Enterprises Inc | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1991 |
| 6 | D & T Oil | Bremen, OH 43107 | Oil & Gas Operator | Dec 2011 |
| 7 | D C Oil Company, Inc. | Sundown, TX 79372 | Oil & Gas Operator | Apr 2026 |
| 8 | D&D Energy Company | N.Canton, OH 44721 | Oil & Gas Operator | Dec 2020 |
| 9 | D-D Oil | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2018 |
| 10 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Apr 2026 |
| 11 | Dalton & Hanna LTD | Wooster, OH 44691 | Oil & Gas Operator | Dec 2018 |
| 12 | Danny Long & Sons Inc | Magnolia, OH 44643 | Oil & Gas Operator | Dec 2024 |
| 13 | Dart Oil & Gas Corporation | Mason, MI 48854 | Oil & Gas Operator | Jun 2018 |
| 14 | Dart Oil & Gas Ohio LLC | Mason, MI 48854 | Oil Operator | Dec 2018 |
| 15 | Dart Oil Company | Parker, CO 80134 | Oil & Gas Operator | Dec 2024 |
| 16 | David A Waldron & Assoc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2016 |
| 17 | David R Hill Inc | Byesville, OH 43723 | Oil & Gas Operator | Dec 2024 |
| 18 | Davis Bradley & Kathy | Stockport, OH 43787 | Oil Operator | Dec 2025 |
| 19 | DC Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2025 |
| 20 | Dci Petroleum Inc | University Heights, OH 44118-3818 | Oil & Gas Operator | Dec 2017 |
| 21 | Decker Well Service LLC | Fleming, OH 45729 | Oil & Gas Operator | Dec 2017 |
| 22 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 23 | Deep Resources LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2025 |
| 24 | Deer Creek Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2019 |
| 25 | Deer Oil & Gas | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 26 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 27 | Dennis Lloyd D | Fleming, OH 45729 | Oil & Gas Operator | Dec 2025 |
| 28 | Dennis Oil & Gas LLC | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 29 | Depuy Drilling Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 30 | Derby Oil & Gas Corp | Cumberland, OH 43732 | Oil & Gas Operator | Dec 1986 |
| 31 | Derby Operating Corp | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 32 | Derrick Petroleum Inc | Bladensburg, OH 43005 | Oil & Gas Operator | Dec 2025 |
| 33 | Desco Corp | Columbus, OH 43085 | Oil & Gas Operator | Dec 1989 |
| 34 | Dever Lavon B | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2012 |
| 35 | Dever Linda K | Norwalk, OH 43767 | Oil & Gas Operator | Dec 2024 |
| 36 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 37 | Devore Anthony D | Gambier, OH 43022 | Oil & Gas Operator | Dec 2010 |
| 38 | Diamond Oil Co | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1992 |
| 39 | Diamond Shamrock Chem Co | Irving, TX 75061 | Oil & Gas Operator | Dec 1990 |
| 40 | Dietrich Foundation | Pittsburgh, PA 15219 | Gas Operator | Dec 2025 |
| 41 | Dietrich Philip H | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 42 | Dils Oil & Gas | Parkersburg, WV 26101 | Oil & Gas Operator | Dec 2024 |
| 43 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 44 | Discovery Oil And Gas | Canonburg, PA 15317 | Oil & Gas Operator | Dec 2024 |
| 45 | Discovery Oil LTD | Los Angeles, CA 90067 | Oil & Gas Operator | Jan 1993 |
| 46 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Apr 2026 |
| 47 | Dixon Exploration Inc | Abilene, TX 79604 | Oil & Gas Operator | Oct 2019 |
| 48 | DJR Well Services Inc | McDonald, OH 44437 | Oil & Gas Operator | Dec 2025 |
| 49 | DNL Oil Corp | New Lexington, OH 43764 | Oil & Gas Operator | Dec 2012 |
| 50 | Dome Drilling Co | Westlake, OH 44145-1964 | Oil & Gas Operator | Dec 2009 |
| 51 | Dome Producing | Cleveland, OH 44114 | Oil & Gas Operator | Dec 1988 |
| 52 | Domestic Oil & Gas Co | Bedford, OH 44146 | Oil & Gas Operator | Dec 1990 |
| 53 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 54 | Dominion Field Services Inc | Richmond, VA 23219 | Oil & Gas Operator | Dec 2013 |
| 55 | Don Byers Oil & Gas LLC | Heath, OH 43056 | Oil & Gas Operator | Dec 2025 |
| 56 | Don Yohe Enterprises Inc. | Armada, MI 48005 | Oil & Gas Operator | Apr 2018 |
| 57 | Donaker Alan M | Warsaw, OH 43844 | Oil & Gas Operator | Dec 1994 |
| 58 | Doran & Associates | Pittsburgh, PA 15220 | Oil & Gas Operator | Dec 1988 |
| 59 | Dorfman Production Company | Beloit, OH 44609 | Oil & Gas Operator | Apr 2026 |
| 60 | Dorsey Oil & Gas LLC | Nashport, OH 43830 | Oil & Gas Operator | Dec 2025 |
| 61 | Dover Atwood Corp. | Massillon, OH 44646 | Oil & Gas Operator | Dec 2025 |
| 62 | Dover Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1999 |
| 63 | Drillex Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2003 |
| 64 | Dry Hole Producing LLC | Poland, OH 44514 | Oil & Gas Operator | Dec 2025 |
| 65 | Dry Hole Producing LP | Poland, OH 44514-3631 | Oil & Gas Operator | Dec 2019 |
| 66 | Duck Creek Energy Inc | Brecksville, OH 44141 | Oil & Gas Operator | Dec 2025 |
| 67 | Duck Creek Petroleum LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2012 |
| 68 | Dugan Evan | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2024 |
| 69 | Dugan Guy E | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2015 |
| 70 | Dugan Harry Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1993 |
| 71 | Dugan Oil And Gas LLC | Walhonding, OH 43843-9612 | Oil & Gas Operator | Dec 2025 |
| 72 | Dupke Roger Oil Co Inc | Reno, OH 45773 | Oil & Gas Operator | Dec 2004 |
| 73 | Durst Oil & Gas, Inc. | Point Pleasant, WV 25550 | Oil & Gas Operator | Dec 2021 |
| 74 | Dustin Energy Inc | Warren, OH 44481 | Oil & Gas Operator | Dec 2025 |
| 75 | Dusty Drilling & Producing Corp | New Lexington, OH 43764-1552 | Oil & Gas Operator | Dec 2005 |
| 76 | Duty Oil & Gas Prod Co | Akron, OH 44306 | Oil & Gas Operator | Dec 1997 |
| 77 | Dye Walter M | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2022 |