| 1 | D & A Oil Company | Abilene, TX 79606 | Oil & Gas Operator | Oct 2018 |
| 2 | D & B Energy Corporation | San Antonio, TX 78264 | Oil Operator | Sep 2025 |
| 3 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 4 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 5 | D & D Enterprises | Post, TX 79356 | Oil & Gas Operator | Sep 2025 |
| 6 | D & D Oil Co. #2 | Post, TX 79356 | Oil & Gas Operator | Sep 2025 |
| 7 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Sep 2025 |
| 8 | D & D Well Service, L.L.C. | Post, TX 79356 | Oil Operator | Sep 2025 |
| 9 | D & E Oil Co | Perryton, TX 79070 | Oil & Gas Operator | Sep 2025 |
| 10 | D & G Company | Iraan, TX 79744 | Oil Operator | Apr 2006 |
| 11 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 12 | D & H Investments | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2025 |
| 13 | D & H Oil | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2022 |
| 14 | D & H Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2024 |
| 15 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Sep 2025 |
| 16 | D & L Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Nov 2022 |
| 17 | D & L Partnership | Rhome, TX 76078 | Oil Operator | May 1987 |
| 18 | D & M Company | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2008 |
| 19 | D & N Oil Co. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 20 | D & P Operating & Prod. Corp. | Cedar Park, TX 78613 | Oil & Gas Operator | Dec 2003 |
| 21 | D & R Enterprises | Eastland, TX 76448 | Oil & Gas Operator | Oct 2020 |
| 22 | D & S Oil Co. #1 | Borger, TX 79007 | Oil & Gas Operator | Sep 2025 |
| 23 | D & S Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Sep 2025 |
| 24 | D & V Oil Co., LP | San Angelo, TX 76909 | Oil & Gas Operator | Jan 2019 |
| 25 | D & W Trucking Company | De Berry, TX 75639 | Oil Operator | Mar 2003 |
| 26 | D And B Oil | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 27 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 28 | D C Oil Company, Inc. | Sundown, TX 79372 | Oil & Gas Operator | Sep 2025 |
| 29 | D G D Oil Co. | Imperial, TX 79743 | Oil & Gas Operator | Sep 2025 |
| 30 | D J Production | Pasadena, TX 77502 | Oil & Gas Operator | Mar 2025 |
| 31 | D L Operating | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 32 | D&H-S-S Production Co.,Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Aug 2003 |
| 33 | D&M Operating, L.L.C. | Corpus Chrsti, TX 78414 | Gas Operator | Sep 2025 |
| 34 | D&S Oil And Gas Properties | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2025 |
| 35 | D-Bar Leasing, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2022 |
| 36 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Sep 2025 |
| 37 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 38 | D-S-B Properties, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 39 | D-T Development Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2002 |
| 40 | D. & D. Operating Account | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2009 |
| 41 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 42 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Sep 2025 |
| 43 | D. O. G. Operating, LLC | Port Aransas, TX 78373 | Oil & Gas Operator | Sep 2025 |
| 44 | D. Shel Oil, Inc. | Gonzales, TX 78629 | Oil Operator | Sep 2025 |
| 45 | D.C. Oil | Natalia, TX 78059 | Oil Operator | Sep 2025 |
| 46 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Sep 2025 |
| 47 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Sep 2025 |
| 48 | D.K.D. | Merkel, TX 79536 | Oil & Gas Operator | Sep 2025 |
| 49 | D.N.I. | Bangs, TX 76823 | Oil & Gas Operator | Sep 2025 |
| 50 | D.O.E. Energy | Palestine, TX 75801 | Oil & Gas Operator | Sep 2025 |
| 51 | D.T. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 2025 |
| 52 | D.W.P. Production | Perryton, TX 79070 | Oil & Gas Operator | Nov 2020 |
| 53 | D.Y. Exploration, Inc. | Boise, ID 83705 | Oil & Gas Operator | Sep 2025 |
| 54 | D10 Energy LLC | Stinnett, TX 79083 | Oil & Gas Operator | Sep 2025 |
| 55 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 56 | Da Crowe & Associates, Inc | Chappell Hill, TX 77426 | Oil & Gas Operator | Sep 2010 |
| 57 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 58 | Daco Oil | Joinerville, TX 75658 | Oil & Gas Operator | Aug 2019 |
| 59 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Sep 2025 |
| 60 | Dacott Oil & Gas, LLC | Pampa, TX 79065 | Oil & Gas Operator | Sep 2011 |
| 61 | Daesung Energy Resources Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2025 |
| 62 | Daf Operating, LLC | Houston, TX 77005 | Oil & Gas Operator | Sep 2025 |
| 63 | Dahab Energy Inc. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 64 | Dahco Operating, LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 2025 |
| 65 | Dahlia Operating LLC | Petrolia, TX 76377 | Oil & Gas Operator | Apr 2018 |
| 66 | Daily, Carroll | Loving, TX 76460 | Oil & Gas Operator | Sep 2023 |
| 67 | Dain Oil | Graham, TX 76450 | Oil & Gas Operator | Dec 2007 |
| 68 | Dakar Operating Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 2001 |
| 69 | Dakota Oil Company | Hebbronville, TX 78361 | Oil & Gas Operator | Sep 2025 |
| 70 | Dakota Resources, Inc | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 71 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Sep 2025 |
| 72 | Dal-Long Oil Company | Longview, TX 75608 | Oil Operator | Feb 2001 |
| 73 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 74 | Dale Operations, LLC | Dickinson, TX 77539 | Oil & Gas Operator | Sep 2025 |
| 75 | Dale, Doyle C. | Poolville, TX 76487 | Oil & Gas Operator | Sep 2018 |
| 76 | Daleco Resources, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2008 |
| 77 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 78 | Dales Oil Company | Loving, TX 76460 | Oil Operator | Sep 2025 |
| 79 | Dalf Energy LLC | Pampa, TX 79066 | Oil & Gas Operator | Sep 2025 |
| 80 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 81 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Sep 2025 |
| 82 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Sep 2025 |
| 83 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 84 | Dallas Resources, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 1997 |
| 85 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 86 | Dally'S Oil Co. LLC | Monahans, TX 79756 | Oil Operator | Sep 2025 |
| 87 | Dalport Oil Corporation | Dallas, TX 75202 | Oil & Gas Operator | Apr 1993 |
| 88 | Dameron Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | Sep 2025 |
| 89 | Damron Energy | Eden, TX 76837 | Oil & Gas Operator | Jan 2015 |
| 90 | Damron Energy, LLC | Eden, TX 76837 | Oil & Gas Operator | Sep 2025 |
| 91 | Dan A. Hughes Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | May 2025 |
| 92 | Dan Texas Company | Waco, TX 76710 | Oil & Gas Operator | Sep 1998 |
| 93 | Danco Oil & Gas | White Deer, TX 79097 | Oil & Gas Operator | Aug 2013 |
| 94 | Daniel Explorations Inc | Georgetown, TX 78627 | Oil & Gas Operator | Apr 2009 |
| 95 | Daniel Mineral Development, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2007 |
| 96 | Daniel Oil & Gas | Granbury, TX 76049 | Oil & Gas Operator | Oct 2010 |
| 97 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | Sep 2025 |
| 98 | Daniels Energy | Pampa, TX 79066 | Oil & Gas Operator | Sep 2025 |
| 99 | Daniels Petroleum Co | Denver, CO 80202 | Oil & Gas Operator | Mar 2003 |
| 100 | Daniels, C. W. | Stockdale, TX 78160 | Oil & Gas Operator | Dec 2009 |