| 1501 | Tri-County Oil & Gas, Inc. | Fairmont, WV 26555-0000 | Oil & Gas Operator | Dec 2019 |
| 1502 | Tri-Crude Oil & Gas | Harrisville, WV 26362-0000 | Oil & Gas Operator | Dec 2021 |
| 1503 | Tri-Dyne Resources, Inc. | Southern Pine, NC 28387 | Oil & Gas Operator | Feb 2000 |
| 1504 | Tri-Ex Corporation | | Oil & Gas Operator | Jan 1985 |
| 1505 | Tri-Ex Petroleum, L.P. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2013 |
| 1506 | Tri-Force Operating, L.L.C. | Royse City, TX 75189 | Oil & Gas Operator | Feb 2026 |
| 1507 | Tri-J Tubulars, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1996 |
| 1508 | Tri-K Production Company, Inc. | Olney, TX 76374 | Oil & Gas Operator | Apr 1996 |
| 1509 | Tri-L Oil Co. | | Oil Operator | Sep 2015 |
| 1510 | Tri-Par Exploration, Inc. | | Oil Operator | Oct 2001 |
| 1511 | Tri-Production Company | | Oil Operator | Apr 1994 |
| 1512 | Tri-Quest Resources | | Oil & Gas Operator | Feb 1995 |
| 1513 | Tri-State Exploration & Prod Inc | Marshall, TX 75671 | Oil & Gas Operator | Aug 2003 |
| 1514 | Tri-State Pipeline Service Inc | Ninnekah, OK 73067-0189 | Oil & Gas Operator | Mar 2011 |
| 1515 | Tri-State Resources, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2012 |
| 1516 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 1517 | Tri-Tex Exploration LTD | Abilene, TX 79608 | Oil Operator | Apr 2019 |
| 1518 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1519 | Tri-Unity Inc | Sand Springs, OK 74063-4401 | Oil & Gas Operator | Jun 2009 |
| 1520 | Tri-Valley Oil & Gas Co. | | Oil & Gas Operator | Nov 2025 |
| 1521 | Tri-W Oil | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 1522 | Tri-W Oil, Inc. | Luling, TX 78648 | Oil Operator | Apr 2007 |
| 1523 | Triad Drilling C | | Oil & Gas Operator | Nov 1988 |
| 1524 | Triad Energy Corp Of Texas | Houston, TX 77057-2696 | Oil & Gas Operator | Sep 2014 |
| 1525 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 1526 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Dec 2025 |
| 1527 | Triad Hunter, LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2021 |
| 1528 | Triad O&G, LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 1529 | Triad Oil & Gas Co Inc | | Oil & Gas Operator | Jun 1994 |
| 1530 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 1531 | Triag Energy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2014 |
| 1532 | Triage Energy Corporation | Midland, TX 79708 | Oil & Gas Operator | Oct 2001 |
| 1533 | Triana Energy LLC | Charleston, WV 25301-2815 | Gas Operator | Nov 2018 |
| 1534 | Triangle Development Co | Mahtomedi, MN 55115 | Gas Operator | Feb 1982 |
| 1535 | Triangle Energy Co. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 1536 | Triangle Interprises Inc | Justin, TX 76247-0598 | Oil & Gas Operator | Jun 2015 |
| 1537 | Triangle J Oil Company | | Oil & Gas Operator | Mar 2007 |
| 1538 | Triangle Oil & G G Cornwell | | Oil & Gas Operator | Nov 1981 |
| 1539 | Triangle Oil Of Hosston | | Oil Operator | Jul 2014 |
| 1540 | Triangle Oil Producers Inc | | Oil & Gas Operator | Jun 1998 |
| 1541 | Triangle Operating Co., Inc. | | Gas Operator | Jan 2000 |
| 1542 | Triangle P Development Corp. | Bronte, TX 76933 | Oil & Gas Operator | Feb 2026 |
| 1543 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2024 |
| 1544 | Triangle USA Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2021 |
| 1545 | Triax Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2018 |
| 1546 | Tribal Oil Company | | Oil & Gas Operator | Dec 1981 |
| 1547 | Tribar Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 1548 | Tribune Resources, LLC | | Oil & Gas Operator | Dec 2021 |
| 1549 | Tricentrol Resources Inc | Englewood, CO 80111 | Oil & Gas Operator | Jun 1984 |
| 1550 | Trich Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2025 |
| 1551 | Trichel Contracting Company | | Oil & Gas Operator | Sep 1987 |
| 1552 | Trickle Down Oil, Inc. | | Oil & Gas Operator | Feb 2016 |
| 1553 | Trico Energy Corporation | | Oil Operator | May 1984 |
| 1554 | Trico Energy LLC | Hager Hill, KY 41222 | Oil Operator | Dec 2018 |
| 1555 | Trico Oil & Gas Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Feb 2026 |
| 1556 | Trico Oil Co., Inc. | | Gas Operator | Nov 1978 |
| 1557 | Trico/Tiger Development LLC | | Gas Operator | Dec 2017 |
| 1558 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Feb 2026 |
| 1559 | Trident Oil & Gas Corp. | | Oil & Gas Operator | Sep 2000 |
| 1560 | Trident Oil & Gas Corporation Inc. | | Oil & Gas Operator | Dec 1993 |
| 1561 | Tridon Oil Inc | Lafayette, LA 70505-2305 | Gas Operator | Dec 2013 |
| 1562 | Triesco, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1996 |
| 1563 | Triexco Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2012 |
| 1564 | Triforce Energy LLC | Littleton, CO 80122 | Oil & Gas Operator | Feb 2026 |
| 1565 | Trigeo Energy, LLC | Addison, TX 75001 | Oil & Gas Operator | Feb 2026 |
| 1566 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 1567 | Trigg Exploratio | | Gas Operator | Feb 1992 |
| 1568 | Trigg Oil Mining Corporation | | Oil & Gas Operator | Dec 2007 |
| 1569 | Trigger'S Disposal LLC | Sayre, OK 73662-2913 | Oil Operator | Sep 2022 |
| 1570 | Trigo Oil And Gas, LLC | Amarillo, TX 79101 | Oil & Gas Operator | Mar 2022 |
| 1571 | Trigon Exploration, Inc. | | Oil & Gas Operator | Jan 1999 |
| 1572 | Triken Oil & Gas | | Oil & Gas Operator | Feb 1995 |
| 1573 | Triken Oil & Gas, Inc. | Bellingham, WA 98225 | Gas Operator | Dec 1996 |
| 1574 | Trilliant Energy Texas LTD | Tulsa, OK 74135-0767 | Oil & Gas Operator | Jun 2020 |
| 1575 | Trilogy Natural Resources LLC | Edmond, OK 73025 | Oil Operator | Nov 2025 |
| 1576 | Trilogy Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 1577 | Trimble & Maclaskey Oil LLC | Gridley, KS 66852 | Oil Operator | Sep 2025 |
| 1578 | Trimble, Don G Dba Trimble Production Company | Houston, TX 77066 | Oil Operator | Jan 2025 |
| 1579 | Trimble, IVal L. | Gridley, KS 66852 | Oil Operator | Dec 2019 |
| 1580 | Trimont Energy LLC | Pittsburgh, PA 15211-1205 | Oil & Gas Operator | Dec 2016 |
| 1581 | Trineha Inc | Ardmore, OK 73402-2478 | Oil & Gas Operator | Jun 2009 |
| 1582 | Trinidad Energy, LLC | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 1583 | Trinidad Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 1584 | Trinidad Petroleum Corporation | | Oil & Gas Operator | Apr 1990 |
| 1585 | Trinidad Petroleum, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 2026 |
| 1586 | Trinidad Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 1587 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Feb 2026 |
| 1588 | Trinity Energy Corp | Gibsonia, PA 15044-9106 | Oil & Gas Operator | Dec 2007 |
| 1589 | Trinity Eor, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2019 |
| 1590 | Trinity Exploration Co | | Oil Operator | Dec 1998 |
| 1591 | Trinity Gas Corporation | Edmond, OK 73003 | Oil & Gas Operator | Feb 2026 |
| 1592 | Trinity Gas Storage, LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Feb 2026 |
| 1593 | Trinity Group LLC | | Oil Operator | Dec 1997 |
| 1594 | Trinity Mineral Partners LLC | Pittsburgh, PA 15238-2718 | Oil & Gas Operator | Dec 2025 |
| 1595 | Trinity Minerals&Operating Corp. | Abilene, TX 79605 | Oil & Gas Operator | Dec 1995 |
| 1596 | Trinity Oil & Gas Dev Inc | | Oil & Gas Operator | Jun 1994 |
| 1597 | Trinity Oil & Gas Inc | Pauls Valley, OK 73075 | Oil Operator | Nov 2025 |
| 1598 | Trinity Oil & Gas Producers LLC | Allen, OK 74825 | Oil & Gas Operator | Dec 2025 |
| 1599 | Trinity Operating & Prod., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 1600 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |