| 1 | W & C Oil & Gas | | Oil Operator | Feb 1996 |
| 2 | W & K Oil Co. | | Oil & Gas Operator | Jun 1989 |
| 3 | W & L Oil Co. | | Oil Operator | Aug 1995 |
| 4 | W & T Offshore, Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 5 | W & T Oil Properties, Inc. | | Oil & Gas Operator | Nov 1989 |
| 6 | W B Powers Production Serv. | | Oil Operator | Feb 1991 |
| 7 | W D L Enterprises, Inc | | Oil & Gas Operator | Apr 1983 |
| 8 | W M Smith | | Oil Operator | Jun 1989 |
| 9 | W&S Energy LLC | Woodward, OK 73801 | Oil & Gas Operator | Sep 2022 |
| 10 | W&W Oil Co | Denver City, TX 79323 | Oil Operator | Jun 2002 |
| 11 | W. A. Moncrief | | Oil & Gas Operator | Jun 2010 |
| 12 | W. A. Moncrief, Jr. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 13 | W. A. Parker | | Oil & Gas Operator | Jan 1981 |
| 14 | W. A. Stanberry | | Oil & Gas Operator | Nov 1988 |
| 15 | W. B. Inabnet | | Gas Operator | Oct 1985 |
| 16 | W. B. Jayred | | Oil & Gas Operator | Aug 1982 |
| 17 | W. B. McCarter, Jr., Inc. | | Oil & Gas Operator | Dec 1995 |
| 18 | W. C. Allen | | Oil & Gas Operator | Dec 2024 |
| 19 | W. C. Emmons | | Oil Operator | Jan 2025 |
| 20 | W. D. Roberson | | Gas Operator | Mar 2021 |
| 21 | W. D. Tarver | | Oil Operator | Aug 2005 |
| 22 | W. E. O'Malley, Inc. | | Oil & Gas Operator | Jun 1991 |
| 23 | W. E. Orr | | Oil & Gas Operator | Dec 2024 |
| 24 | W. G. Darsey, III | | Oil & Gas Operator | Nov 1981 |
| 25 | W. H. Beene | | Oil & Gas Operator | Jan 2025 |
| 26 | W. H. Hunt | | Oil & Gas Operator | Jan 1984 |
| 27 | W. H. Hunt, Et Al | | Oil & Gas Operator | Jul 1990 |
| 28 | W. Harlan Beene | | Oil Operator | Jan 2025 |
| 29 | W. Harlan Beene Et Al | | Oil Operator | Dec 2002 |
| 30 | W. J. Wegman, Jr. | | Gas Operator | Dec 1991 |
| 31 | W. L. Estis | | Oil & Gas Operator | Dec 1999 |
| 32 | W. L. Puls & T. D. Rush | | Oil & Gas Operator | Dec 1980 |
| 33 | W. L. Rambo | | Oil Operator | Apr 1981 |
| 34 | W. L. Rambo, Inc. | | Oil & Gas Operator | Aug 1985 |
| 35 | W. M. Inabnet Agent | | Gas Operator | Oct 1985 |
| 36 | W. M. Morgan | | Oil Operator | Jan 1985 |
| 37 | W. R. Jennings, Jr. | | Oil Operator | Aug 2003 |
| 38 | W. S. Hale Petroleum | | Oil & Gas Operator | Jul 2015 |
| 39 | W. S. Hale Petroleum, L.L.C. | | Oil & Gas Operator | Jan 2025 |
| 40 | W. T. Waggoner Estate | | Oil & Gas Operator | Dec 1995 |
| 41 | W. Trich & Hallwell, Inc. | | Oil & Gas Operator | Oct 1988 |
| 42 | W. W. F. Oil Corporation | | Oil & Gas Operator | Dec 1999 |
| 43 | W. W. Melton | | Oil Operator | Sep 1983 |
| 44 | W.D. Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Oct 2001 |
| 45 | Wacker Oil Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 46 | Wagner & Brown | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 47 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 48 | Wagon Wheel Arklatex, LLC | | Oil & Gas Operator | May 2018 |
| 49 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 50 | Walker Energy, LLC | | Oil & Gas Operator | Nov 2024 |
| 51 | Walker La. Properties | | Oil & Gas Operator | Oct 1990 |
| 52 | Walker Management Company | | Oil & Gas Operator | Apr 1988 |
| 53 | Walker-Wilson | | Oil & Gas Operator | Jul 1999 |
| 54 | Wallace D. Putman, Jr. | | Oil Operator | Jan 2025 |
| 55 | Wallace Operating Company | | Oil & Gas Operator | Sep 1986 |
| 56 | Waller Brothers, Inc. | | Oil & Gas Operator | Jul 2004 |
| 57 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Mar 2025 |
| 58 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 59 | Walter T. Lanaux | | Oil & Gas Operator | Nov 1990 |
| 60 | Walter W. Heard, Jr. | | Oil & Gas Operator | Dec 1995 |
| 61 | Walters Production | | Oil Operator | Mar 2005 |
| 62 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Mar 2025 |
| 63 | Warhorse Oil & Gas, LLC | | Oil & Gas Operator | Dec 2018 |
| 64 | Warwick Oil & Gas, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 1993 |
| 65 | Warwick Oil Corp. | | Oil & Gas Operator | Mar 1990 |
| 66 | Watchtower Petroleum LLC | | Oil & Gas Operator | Dec 2024 |
| 67 | Watson Energy, L.L.C. | | Oil & Gas Operator | Jun 2005 |
| 68 | Watson Oil & Gas Corp. | | Oil Operator | Aug 1994 |
| 69 | Watson Oil Corporation | | Oil & Gas Operator | Jun 1981 |
| 70 | Watts And Hill Oil Company | | Oil Operator | Sep 1995 |
| 71 | Wayman W. Buchanan | | Oil & Gas Operator | Feb 1986 |
| 72 | Wayne J. Spears | | Oil & Gas Operator | Sep 2005 |
| 73 | WCC Energy Group LLC | | Oil & Gas Operator | Dec 2024 |
| 74 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 75 | Weathersby Oil Co. | | Oil Operator | Oct 2001 |
| 76 | Weaver Bros | | Oil Operator | Nov 1987 |
| 77 | Weaver Expl & Brock Pet Corp | | Oil & Gas Operator | Apr 1983 |
| 78 | Weaver Exploration Company | | Oil & Gas Operator | Jun 1991 |
| 79 | Weaver Oil & Gas Corporation | | Oil & Gas Operator | Dec 1984 |
| 80 | Webster Energy, Inc. | | Oil & Gas Operator | Jan 1999 |
| 81 | Wedco Resources Corporation | | Oil & Gas Operator | Jul 1989 |
| 82 | Weeks Exploration Company | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 83 | Weiser-Brown Operating Company | Magnolia, AR 71754 | Oil & Gas Operator | Mar 2025 |
| 84 | Wells-Battelstein O&G, Inc. | | Gas Operator | Dec 1986 |
| 85 | Wenert Trich | | Oil & Gas Operator | Oct 1988 |
| 86 | Wentworth Production Company | | Oil & Gas Operator | Aug 1985 |
| 87 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 88 | Wesla Oil & Gas Co., Inc. | | Oil & Gas Operator | Jun 2001 |
| 89 | Wessely Energy Company | Dallas, TX 75206 | Oil & Gas Operator | May 2001 |
| 90 | Wessely Energy Corporation | | Oil & Gas Operator | Feb 1989 |
| 91 | West Delta Oil Co. | | Oil & Gas Operator | Jul 2000 |
| 92 | Westall Oil & Gas Co. | | Oil & Gas Operator | May 1982 |
| 93 | Westar Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 94 | Westar Oil & Minerals | | Oil Operator | Feb 1999 |
| 95 | Westek Resources, Inc. | | Oil & Gas Operator | Jan 2004 |
| 96 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 97 | Western Exploration, Inc. | | Oil Operator | May 1984 |
| 98 | Western Gas Resources Inc | Denver, CO 80202-1955 | Oil & Gas Operator | Dec 2007 |
| 99 | Western Resources, Inc. | | Oil Operator | Jun 1994 |
| 100 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |