| 28601 | T & O Gas Co | | Oil Operator | May 2001 |
| 28602 | T & P Exploration | Addison, TX 75006 | Oil & Gas Operator | Aug 1993 |
| 28603 | T & P Oil & Gas, L.L.C. | Overland Park, KS 66212 | Oil Operator | Dec 2009 |
| 28604 | T & R Investments, Inc. | Borger, TX 79008 | Oil & Gas Operator | Nov 1995 |
| 28605 | T & R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 28606 | T & R Oil Company, A General Partnership | Moline, KS 67353 | Oil Operator | Dec 2019 |
| 28607 | T & S Oil & Gas, LLC | Graham, TX 76450 | Gas Operator | Jun 2025 |
| 28608 | T & T Compression Inc | Clymer, PA 15728-1014 | Gas Operator | Dec 2024 |
| 28609 | T & T Contracting Dba Hulman Contracting, LLC | Rockfield, KY 42274 | Oil & Gas Operator | Dec 2023 |
| 28610 | T & T Oil Co. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2002 |
| 28611 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 28612 | T & W Ward Oil LLC | Blackwell, OK 74631 | Oil Operator | Mar 2025 |
| 28613 | T - C Oil Company | Refugio, TX 78377 | Oil & Gas Operator | Jan 2012 |
| 28614 | T And DS Lube Doctors LLC | Carlsbad, NM 88220 | Gas Operator | Apr 2025 |
| 28615 | T And L Oil Inc | Tonkawa, OK 74653-4530 | Oil & Gas Operator | Jan 2025 |
| 28616 | T B C Inc | Coweta, OK 74429 | Oil & Gas Operator | Apr 2020 |
| 28617 | T B Drilling Co | Moxahala, OH 43761 | Oil & Gas Operator | Dec 1998 |
| 28618 | T B K Energy Company | New Braunfels, TX 78130 | Oil & Gas Operator | Apr 2025 |
| 28619 | T Bar M Energy Resources LLC | Mounds, OK 74047 | Oil & Gas Operator | Mar 2025 |
| 28620 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 28621 | T C Production | | Oil Operator | May 1994 |
| 28622 | T D Cox Oil Corporation | | Oil & Gas Operator | Mar 2025 |
| 28623 | T D Energy Company Inc | Broken Arrow, OK 74011-3953 | Oil & Gas Operator | Feb 2015 |
| 28624 | T Dozer D Oil Co. | Goree, TX 76363 | Oil & Gas Operator | Jun 2025 |
| 28625 | T E F Inc | Madill, OK 73446-6656 | Oil & Gas Operator | Jul 2023 |
| 28626 | T E L Oil & Gas Corporation | Guymon, OK 73941 | Gas Operator | Mar 2025 |
| 28627 | T G & S Oil | Marietta, OK 73448 | Oil & Gas Operator | Apr 2025 |
| 28628 | T H Production Co. | | Oil & Gas Operator | Mar 1994 |
| 28629 | T I Energy Services Inc | | Oil & Gas Operator | Dec 2003 |
| 28630 | T Investments Inc | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Mar 2011 |
| 28631 | T J D Oil Compan | | Oil Operator | Feb 1989 |
| 28632 | T J Water Works, A Texas LLC | Ballinger, TX 76821 | Oil & Gas Operator | Jun 2025 |
| 28633 | T JS Oil & Gas Inc | Fresno, OH 43824 | Oil & Gas Operator | Dec 2023 |
| 28634 | T L C Oil Inc | Seminole, OK 74868 | Oil & Gas Operator | Mar 2025 |
| 28635 | T M Hopkins Operating Co | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 28636 | T P Operating LLC | | Oil & Gas Operator | Nov 1999 |
| 28637 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 28638 | T S B T Oil & Gas Properties | Moore, OK 73160-8126 | Oil & Gas Operator | Jan 2018 |
| 28639 | T T & T Inc | Shawnee, OK 74802-3694 | Oil & Gas Operator | Jan 1994 |
| 28640 | T W Clemons Operating Co., LLC | Minden, LA 71055 | Oil & Gas Operator | Jun 2025 |
| 28641 | T X P Inc Formerly Petrotech Inc | | Oil & Gas Operator | Jul 1992 |
| 28642 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Jun 2025 |
| 28643 | T&T Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 28644 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 28645 | T-5 Leasing, LLC | | Oil Operator | Dec 2013 |
| 28646 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 28647 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 28648 | T-Boc Inc. | | Oil & Gas Operator | Apr 2016 |
| 28649 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Jun 2025 |
| 28650 | T-D Oil Inc | Cement, OK 73017-0065 | Oil & Gas Operator | May 2020 |
| 28651 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 28652 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 28653 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 28654 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2025 |
| 28655 | T-Rex Oil Inc | Broomfield, CO 80021 | Oil Operator | Feb 2011 |
| 28656 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Jun 2025 |
| 28657 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Jun 2025 |
| 28658 | T. A. Atkinson Opr. | | Gas Operator | Dec 1997 |
| 28659 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | Jun 2025 |
| 28660 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Jun 2025 |
| 28661 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 28662 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 28663 | T. E. Adams Petroleum Corp. | | Oil & Gas Operator | Mar 2025 |
| 28664 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 28665 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 28666 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 28667 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 28668 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 28669 | T. L. J. Incorporated | Big Lake, TX 76932 | Oil & Gas Operator | Dec 1998 |
| 28670 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 28671 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 28672 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 28673 | T. N. T. Inc. | | Oil & Gas Operator | Jan 1987 |
| 28674 | T. N. T. Tribal - Luffey | | Gas Operator | Oct 1994 |
| 28675 | T. O. Kimbrell, LLC | | Oil & Gas Operator | May 2025 |
| 28676 | T. R. Production, Inc. | Pilot Point, TX 76258 | Oil & Gas Operator | Jul 2021 |
| 28677 | T. T. Production, Inc. | Haviland, KS 67059 | Oil & Gas Operator | Feb 2008 |
| 28678 | T. W. Drilling Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2002 |
| 28679 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 28680 | T. West Bullock, SR. | | Oil & Gas Operator | Mar 1989 |
| 28681 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 28682 | T.C. Harris Pumping LLC | Hennessey, OK 73742 | Gas Operator | Mar 2025 |
| 28683 | T.C.G. Oil Co. | Iola, KS 66749 | Oil Operator | Sep 2009 |
| 28684 | T.C.G. Oil Co., A General Partnership | Laharpe, KS 66755 | Oil Operator | Aug 2009 |
| 28685 | T.D. Operating Company, Inc. | New Braunfels, TX 78130 | Oil & Gas Operator | Nov 1999 |
| 28686 | T.F. Well Service, L.L.C. | Iowa Park, TX 76367 | Oil Operator | Jun 2025 |
| 28687 | T.G.B., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 28688 | T.J. Oil | | Oil Operator | Oct 2024 |
| 28689 | T.L.S. Oil Co. | Hawley, TX 79525 | Oil & Gas Operator | Jun 2025 |
| 28690 | T.M. Quaintance Crude Oil Production | | Oil Operator | Dec 2022 |
| 28691 | T.O. Greer Productions | | Oil & Gas Operator | Aug 2013 |
| 28692 | T.O.F., Inc. | | Oil & Gas Operator | Dec 2002 |
| 28693 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 28694 | T.W. Oil LLC | Fordsville, KY 42343 | Oil & Gas Operator | Dec 2024 |
| 28695 | T.W.O. (Taylor Well Operating) | Missoula, MT 59803 | Oil & Gas Operator | Mar 2025 |
| 28696 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 28697 | Tab Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2025 |
| 28698 | Tabbs Bay Production Company | Houston, TX 77019 | Oil Operator | Jun 2025 |
| 28699 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 28700 | Tabco Producing Co. | | Oil & Gas Operator | Jan 1998 |