| 1 | Wacker Oil Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 2 | Waggoner-Baldridge Energy | | Oil Operator | Jun 1988 |
| 3 | Wagner & Brown Limited Partnership | Midland, TX 79701 | Oil & Gas Operator | Feb 2013 |
| 4 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 5 | Walker L Willis | | Oil Operator | Dec 1985 |
| 6 | Wallway M J | Casper, WY 82601 | Oil & Gas Operator | Jan 1993 |
| 7 | Wapiti Oil & Gas LLC | Houston, TX 77024 | Oil Operator | Dec 2011 |
| 8 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 9 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 10 | Ware House Industries | Casper, WY 82605 | Oil & Gas Operator | Dec 2013 |
| 11 | Warrego Oil & Gas LLC | Lander, WY 82520 | Oil Operator | May 2018 |
| 12 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 13 | Warren Enterprises Inc | Gillette, WY 82718 | Oil Operator | Dec 2022 |
| 14 | Washakie Energies Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2019 |
| 15 | Washakie Oil Company | | Oil & Gas Operator | Dec 1989 |
| 16 | Washburn Lee | Newcastle, WY 82701 | Oil Operator | Jan 2025 |
| 17 | Washington Energy Exploration | | Oil & Gas Operator | Dec 1997 |
| 18 | Waterford Production Co | | Oil Operator | Oct 1992 |
| 19 | Wave Petroleum Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 20 | Weaver Dale Inc | Powell, WY 82435 | Oil Operator | Apr 2005 |
| 21 | Weaver Oil Inc | | Oil & Gas Operator | Oct 2011 |
| 22 | Webb Resources Inc | | Oil & Gas Operator | Dec 1985 |
| 23 | Webster Joe | | Oil Operator | Apr 1987 |
| 24 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Aug 2025 |
| 25 | Wem Joint Venture | Gillette, WY 82716 | Oil & Gas Operator | Sep 2015 |
| 26 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 27 | Wesco Production LLC | | Oil & Gas Operator | Jun 2025 |
| 28 | Wessely Energy Corporation | | Oil & Gas Operator | Feb 1989 |
| 29 | West Gas Inc | | Oil & Gas Operator | Dec 2017 |
| 30 | Westburne Petroleum Inc | | Oil Operator | Jun 1990 |
| 31 | Westech Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Mar 2011 |
| 32 | Western American Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2024 |
| 33 | Western Gas Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 34 | Western Interior Energy Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2020 |
| 35 | Western Interior Oil & Gas Corp | Casper, WY 82602 | Oil & Gas Operator | May 2015 |
| 36 | Western Oil Refining Company | Kemmerrer, WY 83101 | Oil & Gas Operator | Dec 1994 |
| 37 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Jul 2025 |
| 38 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 39 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 40 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Jul 2025 |
| 41 | Wexpro Development Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jul 2025 |
| 42 | Wexpro II Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jul 2025 |
| 43 | Wheless Drilling Company | | Oil & Gas Operator | Dec 1989 |
| 44 | Whisler Enterprise Company | Erie, CO 80516 | Oil & Gas Operator | Aug 2025 |
| 45 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 46 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 47 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 48 | Wilbanks Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 49 | Wildfire Partners Inc | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2009 |
| 50 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 51 | Williams Ted H | | Oil & Gas Operator | Dec 2008 |
| 52 | Williston Basin Cosul-Profit SH | | Oil Operator | Dec 1989 |
| 53 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 54 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 55 | Winco Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 1997 |
| 56 | Wind River Energy Commission | | Oil Operator | Jul 2025 |
| 57 | Wind River Exploration | Powell, WY 82435 | Oil & Gas Operator | Aug 2025 |
| 58 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 59 | Winkler L W & Son | Denver, CO 80222 | Oil & Gas Operator | Dec 2001 |
| 60 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 61 | WLP Oil Inc | Gillette, WY 82717 | Oil & Gas Operator | Dec 2018 |
| 62 | Wnu Energy LLC | Pinedale, WY 82941 | Oil & Gas Operator | Aug 2025 |
| 63 | Wold Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2022 |
| 64 | Wold John S | | Gas Operator | Feb 1991 |
| 65 | Wold Oil & Gas | | Oil & Gas Operator | Oct 1996 |
| 66 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 67 | Wolf Energy Company | | Oil & Gas Operator | Dec 1985 |
| 68 | Wolverine Operations LLC | Buffalo, WY 82834 | Gas Operator | Oct 2008 |
| 69 | Wood River Oil & Refining Co | | Oil & Gas Operator | Dec 1998 |
| 70 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 71 | WPX Energy RM Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2014 |
| 72 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Jul 2025 |
| 73 | WRC Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2025 |
| 74 | Wulf Oil Co | | Oil & Gas Operator | Dec 1984 |
| 75 | Wyatt Petroleum Corporation | Evergreen, CO 80437 | Gas Operator | Jul 2002 |
| 76 | Wychgram Daniel C | Thermopolis, WY 82443 | Oil Operator | Feb 2001 |
| 77 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 78 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Aug 2025 |
| 79 | Wyoming Energy Partners LLC | | Oil Operator | Aug 2025 |
| 80 | Wyoming Mineral Exploration LLC | Casper, WY 82602 | Oil Operator | Dec 2006 |
| 81 | Wyoming Oil & Minerals Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 2001 |
| 82 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 83 | Wyoming Western Oil | Pine Bluffs, WY 82082 | Oil Operator | Sep 2019 |