| 1 | D & A Oil Company | Abilene, TX 79606 | Oil & Gas Operator | Oct 2018 |
| 2 | D & A Oil Company, A General Partnership | Clearwater, KS 67026 | Oil Operator | Dec 2024 |
| 3 | D & B Energy Corporation | San Antonio, TX 78264 | Oil Operator | Jul 2025 |
| 4 | D & B Gas Co. | Burden, KS 67019 | Gas Operator | Feb 2001 |
| 5 | D & B Gas Prod LLC | Kittanning, PA 16201-7123 | Oil & Gas Operator | Dec 2024 |
| 6 | D & B Johnson Family LLC | Owasso, OK 74055-7578 | Oil Operator | Apr 2025 |
| 7 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 8 | D & B Operating LLC | Ringwood, OK 73768 | Oil Operator | Jan 2023 |
| 9 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 10 | D & C Operating, Inc. | | Oil & Gas Operator | Apr 1999 |
| 11 | D & D Drilling | Kingston, OK 73439-9549 | Oil & Gas Operator | May 2000 |
| 12 | D & D DRLG Co & Saye Oil Co | | Oil Operator | Apr 1982 |
| 13 | D & D Energy | | Oil Operator | Jul 2023 |
| 14 | D & D Energy Company | North Canton, OH 44721 | Oil & Gas Operator | Dec 2020 |
| 15 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 16 | D & D Enterprises | Post, TX 79356 | Oil & Gas Operator | Jul 2025 |
| 17 | D & D Expl Co-Mba Energy | | Oil Operator | Nov 1985 |
| 18 | D & D Exploration Co. | | Oil & Gas Operator | Nov 1986 |
| 19 | D & D Exploration Co. Et Al | | Oil Operator | Feb 1988 |
| 20 | D & D Oil & Gas, LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2024 |
| 21 | D & D Oil Co. #2 | Post, TX 79356 | Oil & Gas Operator | Jul 2025 |
| 22 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Jul 2025 |
| 23 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 24 | D & D Services | Cement, OK 73017-9712 | Oil Operator | Feb 2017 |
| 25 | D & D Well Service, L.L.C. | Post, TX 79356 | Oil Operator | Jul 2025 |
| 26 | D & E Oil Co | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 27 | D & F Oil Company | Dewey, OK 74029 | Oil & Gas Operator | Apr 2001 |
| 28 | D & F Petroleum | | Oil & Gas Operator | Sep 1990 |
| 29 | D & G Company | Iraan, TX 79744 | Oil Operator | Apr 2006 |
| 30 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 31 | D & G Gas | Shock, WV 26638 | Oil & Gas Operator | Dec 2021 |
| 32 | D & G Natural Resources Inc | Somerset, KY 42502 | Oil & Gas Operator | Dec 2023 |
| 33 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 34 | D & G Oil Compan | | Oil Operator | Mar 1988 |
| 35 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 36 | D & G Roustabout Service | | Oil & Gas Operator | Jan 2024 |
| 37 | D & H Energy, LLC | Shelby, MT 59474 | Oil & Gas Operator | May 2025 |
| 38 | D & H Investments | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 2025 |
| 39 | D & H Oil | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2022 |
| 40 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 41 | D & H Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2024 |
| 42 | D & J Investment | | Oil Operator | Jun 1995 |
| 43 | D & J Investments | Luling, TX 78648 | Oil Operator | Dec 2009 |
| 44 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Jul 2025 |
| 45 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 46 | D & J Producing Company | | Oil Operator | Sep 2006 |
| 47 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | May 2025 |
| 48 | D & K Supply Inc | East Canton, OH 44730 | Oil & Gas Operator | Dec 2002 |
| 49 | D & L Energy | Morland, KS 67650 | Oil Operator | Mar 1995 |
| 50 | D & L Energy Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2016 |
| 51 | D & L Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Nov 2022 |
| 52 | D & L Operating LLC | Morris, OK 74445 | Oil & Gas Operator | Apr 2025 |
| 53 | D & L Partnership | Rhome, TX 76078 | Oil Operator | May 1987 |
| 54 | D & M Company | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2008 |
| 55 | D & M Enterprises Inc | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1991 |
| 56 | D & M Oil, Inc. | Winfield, KS 67156 | Oil Operator | Apr 2001 |
| 57 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jan 2025 |
| 58 | D & M Welding LLC | Kevin, MT 59454 | Oil & Gas Operator | May 2025 |
| 59 | D & N Oil Co. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 60 | D & N Operating Corp | Belpre, OH 45714-8181 | Oil & Gas Operator | Dec 2019 |
| 61 | D & P Operating & Prod. Corp. | Cedar Park, TX 78613 | Oil & Gas Operator | Dec 2003 |
| 62 | D & P Tank Service, Inc. | | Oil Operator | Mar 2000 |
| 63 | D & R Energy | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 64 | D & R Enterprises | Eastland, TX 76448 | Oil & Gas Operator | Oct 2020 |
| 65 | D & R Oil Properties | | Oil Operator | May 1998 |
| 66 | D & R Oil, Inc. | Galva, KS 67443 | Oil & Gas Operator | Jul 2024 |
| 67 | D & R Well Service, Inc. | Galva, KS 67443 | Oil & Gas Operator | Feb 2025 |
| 68 | D & S Energy Corp | Tiona, PA 16352-0102 | Oil & Gas Operator | Dec 2018 |
| 69 | D & S Oil Co. #1 | Borger, TX 79007 | Oil & Gas Operator | Jul 2025 |
| 70 | D & S Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Jul 2025 |
| 71 | D & S Operating | Texhoma, OK 73949 | Oil & Gas Operator | May 2001 |
| 72 | D & T Company | Denver, CO 80210 | Oil & Gas Operator | Jun 1983 |
| 73 | D & T Oil | Bremen, OH 43107 | Oil & Gas Operator | Dec 2011 |
| 74 | D & T Oil Company | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 75 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Apr 2025 |
| 76 | D & V Oil Co., LP | San Angelo, TX 76909 | Oil & Gas Operator | Jan 2019 |
| 77 | D & V Petroleum Corporation | | Oil & Gas Operator | May 1992 |
| 78 | D & W Oil & Gas Co. | | Gas Operator | Jan 1990 |
| 79 | D & W Oil Compan | | Oil Operator | Jan 1987 |
| 80 | D & W Trucking Company | De Berry, TX 75639 | Oil Operator | Mar 2003 |
| 81 | D & Z Exploration, Inc. | St Elmo, IL 62458 | Oil Operator | Mar 2025 |
| 82 | D And B Brine Inc | | Oil Operator | Mar 2025 |
| 83 | D And B Oil | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 84 | D B D Oil & Gas Company | Houston, TX 77001 | Oil & Gas Operator | Mar 2015 |
| 85 | D C Bintliff & W W F Oil Corp. | | Oil & Gas Operator | Dec 1989 |
| 86 | D C Energy | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 87 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 88 | D C Oil Company, Inc. | Sundown, TX 79372 | Oil & Gas Operator | Jul 2025 |
| 89 | D C Oil, Inc | Whitesville, KY 42378 | Oil Operator | Dec 2017 |
| 90 | D D Natural Resources LLC | | Oil & Gas Operator | May 2025 |
| 91 | D G D Oil Co. | Imperial, TX 79743 | Oil & Gas Operator | Jul 2025 |
| 92 | D H & L Operating, Inc. | | Oil & Gas Operator | Sep 1983 |
| 93 | D H Hunt | Dallas, TX 75201 | Oil & Gas Operator | Dec 1994 |
| 94 | D J Oil Operations | | Oil Operator | Dec 2009 |
| 95 | D J Production | Pasadena, TX 77502 | Oil & Gas Operator | Mar 2025 |
| 96 | D J Simmons, Inc | Farmington, NM 87499 | Oil & Gas Operator | Apr 2020 |
| 97 | D K Cook Heirs LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2011 |
| 98 | D K Oil Services LLC | Wellsville, KS 66092 | Oil Operator | Nov 2019 |
| 99 | D L Operating | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 100 | D M Norman | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |