| 1 | Walker Oil & Gas Co LLC* Keith F | | Oil & Gas Operator | Jun 2011 |
| 2 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2024 |
| 3 | Walsh Production Inc | | Oil & Gas Operator | Nov 2008 |
| 4 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Nov 2024 |
| 5 | Ward & Son* Alfred | | Oil & Gas Operator | Jun 2023 |
| 6 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Sep 2024 |
| 7 | Wbi Production | | Gas Operator | May 2002 |
| 8 | Wellington Operating Company | | Oil & Gas Operator | Sep 2024 |
| 9 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Sep 2024 |
| 10 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Sep 2024 |
| 11 | West Texas Operating Co LLC D/B/A Xtreme Energy Co | Victoria, TX 77902-2326 | Oil & Gas Operator | Sep 2024 |
| 12 | Westech Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Mar 2011 |
| 13 | Western Gas Resources Inc | Denver, CO 80202-1955 | Oil & Gas Operator | Dec 2007 |
| 14 | Western Gas Resources-Sand Wash Inc | | Oil & Gas Operator | Feb 2008 |
| 15 | Western Interior Energy Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2020 |
| 16 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Aug 2024 |
| 17 | Westgate Oil Company, Inc. | Eureka, KS 67045 | Oil Operator | Sep 2024 |
| 18 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 19 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Sep 2024 |
| 20 | Wexpro Development Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Aug 2024 |
| 21 | Whitewing Resources LLC | | Oil & Gas Operator | Jun 2014 |
| 22 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 23 | Whittier Energy Company | Farmington, NM 87499 | Oil & Gas Operator | Nov 2002 |
| 24 | Wiepking-Fullerton Energy LLC | | Oil & Gas Operator | Aug 2024 |
| 25 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 2024 |
| 26 | Williford Resources LLC | Tulsa, OK 74136-1020 | Oil & Gas Operator | Sep 2024 |
| 27 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Jul 2024 |
| 28 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 29 | Winslow Resources Inc | | Oil & Gas Operator | May 2002 |
| 30 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 31 | Wise* Wayne L | | Oil & Gas Operator | Dec 2023 |
| 32 | Wme Yates LLC | | Gas Operator | Dec 2023 |
| 33 | Wofford* William R | | Oil Operator | Jun 2014 |
| 34 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 35 | Wolverine Resources LLC | | Oil & Gas Operator | Jan 2024 |
| 36 | WPX Energy Production LLC | Tulsa, OK 741013102 | Oil & Gas Operator | Nov 2020 |
| 37 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2024 |
| 38 | WPX Energy Ryan Gulch LLC | | Oil & Gas Operator | Nov 2013 |
| 39 | Wy Woodland Operating, LLC | Covington, TX 76636 | Oil & Gas Operator | Nov 2024 |
| 40 | Wyman* Louis M Dba Wyman Inc | | Oil & Gas Operator | Sep 2024 |