| 901 | Thrash, Afton | Kilgore, TX 75663 | Oil & Gas Operator | Apr 1996 |
| 902 | Three "N" One Production | | Oil & Gas Operator | Dec 2011 |
| 903 | Three B Corporation | Fort Worth, TX 76179 | Gas Operator | Jun 2009 |
| 904 | Three B Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2026 |
| 905 | Three B, LP | Fort Worth, TX 76179 | Gas Operator | Jul 2026 |
| 906 | Three Bros. Energy, Inc. | Ponca City, OK 74601 | Gas Operator | Dec 2013 |
| 907 | Three C Exploration, LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Jul 2026 |
| 908 | Three D Oil Comp | | Oil & Gas Operator | Jan 1988 |
| 909 | Three D Petroleum LLC | | Oil Operator | Dec 2024 |
| 910 | Three D Resources Inc | Liberal, KS 67905 | Oil & Gas Operator | Mar 2026 |
| 911 | Three D Submersible Pumps, Inc. | Heavener, OK 74937 | Oil & Gas Operator | Aug 2003 |
| 912 | Three Forks Operating Co, LLC | Flatonia, TX 78941 | Oil & Gas Operator | Jul 2026 |
| 913 | Three Forks Resources, LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Jul 2026 |
| 914 | Three G Inc | Cody, WY 82414 | Oil & Gas Operator | Dec 1999 |
| 915 | Three G Oil Co | Baird, TX 79504 | Oil & Gas Operator | Jun 2004 |
| 916 | Three J Energy, Inc. | Seguin, TX 78155 | Oil & Gas Operator | Jul 2026 |
| 917 | Three J Operating Company, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 2026 |
| 918 | Three J'S Petroleum, Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Jul 2026 |
| 919 | Three MG Family Inc | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 920 | Three Mile Joint Venture | Houston, TX 77027 | Oil & Gas Operator | Jul 1995 |
| 921 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Jul 2026 |
| 922 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 923 | Three Point Energy L.L.C. | Atlanta, TX 75551 | Oil Operator | Jul 2026 |
| 924 | Three R Energy | | Gas Operator | Feb 2026 |
| 925 | Three R Oil Company | Post, TX 79356 | Oil & Gas Operator | Jul 2026 |
| 926 | Three Rivers Exploration LLC | Olpe, KS 66865 | Oil Operator | Sep 2023 |
| 927 | Three Rivers Oper Co III LLC | Austin, TX 78735 | Oil & Gas Operator | Nov 2017 |
| 928 | Three Rivers Operating Co II LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 929 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 930 | Three S & T Oil Co., Inc. | | Oil & Gas Operator | May 1985 |
| 931 | Three Sands Investment Company | Waukomis, OK 73773 | Oil & Gas Operator | Mar 2026 |
| 932 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 933 | Three Sisters Investments, LTD | | Oil & Gas Operator | Oct 1989 |
| 934 | Three Sisters LLC | Cheyenne, WY 82001 | Oil Operator | May 2026 |
| 935 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jan 2025 |
| 936 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2026 |
| 937 | Three Star Energy Inc | | Gas Operator | Nov 1997 |
| 938 | Three States Natural Gas | | Oil & Gas Operator | Mar 1976 |
| 939 | Three Summits Operating LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2026 |
| 940 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Jul 2026 |
| 941 | Three-C Oil And Gas | Hebbronville, TX 78361 | Oil & Gas Operator | Jul 2026 |
| 942 | Three-C Production Company | Temple, TX 76502 | Oil Operator | Jul 2026 |
| 943 | Three-N-One | | Oil Operator | Oct 2020 |
| 944 | Threet David Allen | Sand Springs, OK 74063-4035 | Oil & Gas Operator | Mar 2026 |
| 945 | Threeway Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 946 | Thresher Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jul 2026 |
| 947 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 948 | Threshold Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Oct 2015 |
| 949 | Thriftway Company | Farmington, NM 87401 | Oil & Gas Operator | Dec 1996 |
| 950 | Thriftway Marketing Corp | Farmington, NM 87401 | Gas Operator | Apr 2000 |
| 951 | Thrifty Well Service | Rice, TX 75155 | Oil & Gas Operator | Jun 2009 |
| 952 | Throckmorton Oil, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 953 | Throne Delaware Resources, LLC | McKinney, TX 75072 | Oil & Gas Operator | Dec 2021 |
| 954 | Throne Petroleum Resources LLC | Houston, TX 77006 | Oil & Gas Operator | Aug 2021 |
| 955 | Thropp, Kevin F D/B/A Marilyns Motors | | Oil & Gas Operator | Dec 2020 |
| 956 | THT Covenant Holdings, LLC | Henrietta, TX 76365 | Oil Operator | Jul 2026 |
| 957 | THT Operating Company | | Oil & Gas Operator | Jul 1990 |
| 958 | Thums Long Beach Co. | | Oil & Gas Operator | May 2026 |
| 959 | Thunder Basin Resources LLC | Denver, CO 80203 | Oil & Gas Operator | Jul 2023 |
| 960 | Thunder Corp | Marietta, OH 45750 | Oil & Gas Operator | Dec 2014 |
| 961 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | May 2026 |
| 962 | Thunder Oil, LLC | | Oil & Gas Operator | Oct 1998 |
| 963 | Thunder Petroleum LLC | Owasso, OK 74055-1563 | Oil Operator | Mar 2026 |
| 964 | Thunder Resources LLC | Graham, TX 76450 | Oil Operator | Jul 2026 |
| 965 | Thunderbird (Texas) Resources LP | Edmond, OK 73025 | Oil & Gas Operator | Apr 2019 |
| 966 | Thunderbird Dril | | Oil & Gas Operator | Nov 1995 |
| 967 | Thunderbird Drilling, Inc. | Wichita, KS 67207 | Oil Operator | Oct 2008 |
| 968 | Thunderbird Energy, Inc. | Norman, OK 73069 | Oil & Gas Operator | Jul 2026 |
| 969 | Thunderbird Oil | | Oil Operator | Oct 1991 |
| 970 | Thunderbird Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jul 2026 |
| 971 | Thunderbird Resources LP | | Oil & Gas Operator | Apr 2019 |
| 972 | Thunderbolt Construction Corp. | Louisburg, KS 66053 | Oil Operator | Oct 2024 |
| 973 | Thunderbolt Oil & Gas, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Feb 2004 |
| 974 | Thunderbolt Petroleum Co. LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2011 |
| 975 | Thunderbolt Petroleum, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 976 | Thurber, Gueydon | Horseshoe Bay, TX 78657 | Oil Operator | May 2001 |
| 977 | Thurner Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 978 | Thurston Energy Operating | Vernal, UT 84078 | Oil & Gas Operator | Dec 2015 |
| 979 | Thurston Texas Operating Co LLC | Dallas, TX 75219 | Oil Operator | Jul 2026 |
| 980 | Tiara Resources, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 1998 |
| 981 | Tiburon Oil & Gas Ohio, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2026 |
| 982 | Tiburon Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2000 |
| 983 | Tice, Robin Alejandrina | Gordon, TX 76453 | Gas Operator | Jul 2026 |
| 984 | Tickel Jim & Cindy | Blackwell, OK 74631-6015 | Oil Operator | Jan 2013 |
| 985 | Ticony Inc | | Oil & Gas Operator | Dec 1989 |
| 986 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Jul 2026 |
| 987 | Tidal Wave Energy, Inc. | New Castle, PA 16105 | Oil & Gas Operator | Jun 2022 |
| 988 | Tidd, Frankie | Neosho Falls, KS 66758 | Oil Operator | Nov 1996 |
| 989 | Tidd, Gary D. | Piqua, KS 66761 | Oil Operator | May 2016 |
| 990 | Tide Energy, Inc. | Dallas, TX 75206 | Gas Operator | Oct 1994 |
| 991 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 992 | Tideland Industries, Inc. | | Oil & Gas Operator | Dec 1989 |
| 993 | Tidelands Gas Corporation | Flower Mound, TX 75028 | Oil & Gas Operator | Sep 2000 |
| 994 | Tidelands Oil Corporation | Crystal City, TX 78839 | Oil & Gas Operator | Aug 2003 |
| 995 | Tidelands Oil Production Co. | | Oil & Gas Operator | May 2026 |
| 996 | Tidelands Resources, Inc. | | Gas Operator | Oct 1990 |
| 997 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 998 | Tidemark Exploration Inc | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2019 |
| 999 | Tidemark Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2002 |
| 1000 | Tidewater Co | | Oil & Gas Operator | Sep 1967 |