| 1 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 2 | T-Rex Oil Inc | Broomfield, CO 80021 | Oil Operator | Feb 2011 |
| 3 | Tap Management Inc | Austin, TX 78757 | Oil & Gas Operator | Jan 2023 |
| 4 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 5 | Tara Oil Company | | Oil Operator | Dec 1981 |
| 6 | Target Oil Company | | Oil & Gas Operator | Mar 2007 |
| 7 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 8 | Tbi Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2004 |
| 9 | TCF Inc | | Gas Operator | Dec 1993 |
| 10 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Apr 2024 |
| 11 | Teapot Oil & Refining Company | Billings, MT 59101 | Oil & Gas Operator | Mar 2012 |
| 12 | Temagami Oil & Gas LTD | | Oil & Gas Operator | May 2007 |
| 13 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2023 |
| 14 | Teocali Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 15 | Terex Energy Corporation | Casper, WY 82602 | Oil & Gas Operator | Aug 2019 |
| 16 | Terrapet Corporation | | Oil & Gas Operator | Jun 2011 |
| 17 | Terry Production Co | Stroud, OK 74079-0475 | Oil & Gas Operator | Aug 2008 |
| 18 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 19 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 20 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 21 | Texakota | | Oil & Gas Operator | Mar 1995 |
| 22 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 23 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Apr 2024 |
| 24 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 25 | Texas General Petroleum Corp | | Oil & Gas Operator | Sep 1984 |
| 26 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 27 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 28 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 29 | The Brinkerhoff Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 30 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Feb 2024 |
| 31 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 32 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Apr 2024 |
| 33 | Three G Inc | Cody, WY 82414 | Oil & Gas Operator | Dec 1999 |
| 34 | Three Sisters LLC | Cheyenne, WY 82001 | Oil Operator | Feb 2024 |
| 35 | Thunder Basin Resources LLC | Denver, CO 80203 | Oil & Gas Operator | Jul 2023 |
| 36 | Ticony Inc | | Oil & Gas Operator | Dec 1989 |
| 37 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 38 | Tiger Oil Company | Dallas, TX 75221 | Oil & Gas Operator | May 2007 |
| 39 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Jun 2018 |
| 40 | Timberline Production Company LLC | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 41 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Feb 2024 |
| 42 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 43 | Tipps Kenneth L | | Oil & Gas Operator | Jun 2000 |
| 44 | Titan Exploration LLC | Luling, TX 78648 | Oil & Gas Operator | Feb 2024 |
| 45 | Tobinsnet Oil & Gas LTD | | Oil Operator | Feb 2024 |
| 46 | Toc Oil Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 47 | Toc-Rocky Mountain Inc | | Oil & Gas Operator | Oct 2013 |
| 48 | Toco Corporation | | Oil & Gas Operator | Oct 1991 |
| 49 | Tonka Oil & Gas Production Inc | Buffalo, WY 82834 | Oil & Gas Operator | Sep 1999 |
| 50 | Torch E & P Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2015 |
| 51 | Torch Oil & Gas Company | Houston, TX 77010 | Oil & Gas Operator | Aug 1997 |
| 52 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 53 | Total Petroleum Inc | Denver, CO 80201-0500 | Oil & Gas Operator | Nov 2006 |
| 54 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 55 | TR Operating LLC | Graham, TX 76450 | Oil Operator | Feb 2024 |
| 56 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 57 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 58 | Transglobe Oil & Gas Corporation | Littleton, CO 801222710 | Oil & Gas Operator | Dec 1999 |
| 59 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 60 | Transworld Systems Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2024 |
| 61 | Trend Exploration I LLC | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 62 | Tresor Petroleum | | Oil & Gas Operator | Sep 1987 |
| 63 | Tressler John R & IVa M | | Oil Operator | Apr 1989 |
| 64 | Tri-Ex Corporation | | Oil & Gas Operator | Jan 1985 |
| 65 | Triangle J Oil Company | | Oil & Gas Operator | Mar 2007 |
| 66 | Tribar Resources LLC | | Oil Operator | Feb 2024 |
| 67 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 68 | Trigg Oil Mining Corporation | | Oil & Gas Operator | Dec 2007 |
| 69 | Trinity Energy Resources Inc | Houston, TX 77079 | Oil & Gas Operator | Aug 2005 |
| 70 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 71 | Triple B Energy Inc | Gillette, WY 82716 | Oil Operator | Dec 1999 |
| 72 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2024 |
| 73 | Tripp Oil Company Inc | Houston, TX 77023 | Oil & Gas Operator | Jan 1992 |
| 74 | Tristar Energy Corporation | Casper, WY 82602 | Oil & Gas Operator | Dec 2007 |
| 75 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 76 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 77 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Feb 2024 |
| 78 | Turner Smith & Associates | Englewood, CO 80111 | Oil & Gas Operator | May 1994 |
| 79 | Twin Arrow Inc | Rangely, CO 81648 | Oil & Gas Operator | Sep 2009 |
| 80 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 81 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |
| 82 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Feb 2024 |
| 83 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |