| 1401 | Vessels Oil & Gas Company | Denver, CO 80265 | Oil & Gas Operator | Dec 1998 |
| 1402 | Viable Resources Inc | Casper, WY 82601 | Oil & Gas Operator | Sep 1989 |
| 1403 | Vicorp Energy Inc | Denver, CO 80202-4927 | Oil & Gas Operator | Mar 2001 |
| 1404 | Viking Resources Corp | Deerfield, OH 44411-0160 | Oil & Gas Operator | Dec 2007 |
| 1405 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Jan 2026 |
| 1406 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 1407 | Vortex Petroleum Inc | Centennial, CO 80111 | Oil Operator | Jan 2026 |
| 1408 | Voyager Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2006 |
| 1409 | Wacker Oil Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 1410 | Waggoner-Baldridge Energy | | Oil Operator | Jun 1988 |
| 1411 | Wagner & Brown Limited Partnership | Midland, TX 79701 | Oil & Gas Operator | Feb 2013 |
| 1412 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 1413 | Walker L Willis | | Oil Operator | Dec 1985 |
| 1414 | Wallway M J | Casper, WY 82601 | Oil & Gas Operator | Jan 1993 |
| 1415 | Wapiti Oil & Gas LLC | Houston, TX 77024 | Oil Operator | Dec 2011 |
| 1416 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Apr 2026 |
| 1417 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jan 2026 |
| 1418 | Ware House Industries | Casper, WY 82605 | Oil & Gas Operator | Dec 2013 |
| 1419 | Warrego Oil & Gas LLC | Lander, WY 82520 | Oil Operator | May 2018 |
| 1420 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 1421 | Warren Enterprises Inc | Gillette, WY 82718 | Oil Operator | Dec 2022 |
| 1422 | Washakie Energies Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2019 |
| 1423 | Washakie Oil Company | | Oil & Gas Operator | Dec 1989 |
| 1424 | Washburn Lee | Newcastle, WY 82701 | Oil Operator | Jan 2025 |
| 1425 | Washington Energy Exploration | | Oil & Gas Operator | Dec 1997 |
| 1426 | Waterford Production Co | | Oil Operator | Oct 1992 |
| 1427 | Wave Petroleum Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 1428 | Weaver Dale Inc | Powell, WY 82435 | Oil Operator | Apr 2005 |
| 1429 | Weaver Oil Inc | | Oil & Gas Operator | Oct 2011 |
| 1430 | Webb Resources Inc | | Oil & Gas Operator | Dec 1985 |
| 1431 | Webster Joe | | Oil Operator | Apr 1987 |
| 1432 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Feb 2026 |
| 1433 | Wem Joint Venture | Gillette, WY 82716 | Oil & Gas Operator | Sep 2015 |
| 1434 | Wesco Operating Inc | Casper, WY 82602 | Oil & Gas Operator | Feb 2026 |
| 1435 | Wesco Production LLC | | Oil & Gas Operator | Jun 2025 |
| 1436 | Wessely Energy Corporation | | Oil & Gas Operator | Feb 1989 |
| 1437 | West Gas Inc | | Oil & Gas Operator | Dec 2017 |
| 1438 | Westburne Petroleum Inc | | Oil Operator | Jun 1990 |
| 1439 | Westech Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Mar 2011 |
| 1440 | Western American Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2024 |
| 1441 | Western Gas Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 1442 | Western Interior Energy Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 1443 | Western Interior Oil & Gas Corp | Casper, WY 82602 | Oil & Gas Operator | May 2015 |
| 1444 | Western Oil Refining Company | Kemmerrer, WY 83101 | Oil & Gas Operator | Dec 1994 |
| 1445 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Dec 2025 |
| 1446 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 1447 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 1448 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Feb 2026 |
| 1449 | Wexpro Development Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 2026 |
| 1450 | Wexpro II Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 2026 |
| 1451 | Wheless Drilling Company | | Oil & Gas Operator | Dec 1989 |
| 1452 | Whisler Enterprise Company | Erie, CO 80516 | Oil & Gas Operator | Feb 2026 |
| 1453 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2026 |
| 1454 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 1455 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 1456 | Wilbanks Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1457 | Wildfire Partners Inc | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2009 |
| 1458 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 1459 | Williams Ted H | | Oil & Gas Operator | Dec 2008 |
| 1460 | Williston Basin Cosul-Profit SH | | Oil Operator | Dec 1989 |
| 1461 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 1462 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 1463 | Winco Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 1997 |
| 1464 | Wind River Energy Commission | | Oil Operator | Feb 2026 |
| 1465 | Wind River Exploration | Powell, WY 82435 | Oil & Gas Operator | Feb 2026 |
| 1466 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 1467 | Winkler L W & Son | Denver, CO 80222 | Oil & Gas Operator | Dec 2001 |
| 1468 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 1469 | WLP Oil Inc | Gillette, WY 82717 | Oil & Gas Operator | Dec 2018 |
| 1470 | Wnu Energy LLC | Pinedale, WY 82941 | Oil & Gas Operator | Feb 2026 |
| 1471 | Wold Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2022 |
| 1472 | Wold John S | | Gas Operator | Feb 1991 |
| 1473 | Wold Oil & Gas | | Oil & Gas Operator | Oct 1996 |
| 1474 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 1475 | Wolf Energy Company | | Oil & Gas Operator | Dec 1985 |
| 1476 | Wolverine Operations LLC | Buffalo, WY 82834 | Gas Operator | Oct 2008 |
| 1477 | Wood River Oil & Refining Co | | Oil & Gas Operator | Dec 1998 |
| 1478 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 1479 | WPX Energy RM Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2014 |
| 1480 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Jan 2026 |
| 1481 | WRC Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Feb 2026 |
| 1482 | Wulf Oil Co | | Oil & Gas Operator | Dec 1984 |
| 1483 | Wy Basin Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 1484 | Wyatt Petroleum Corporation | Evergreen, CO 80437 | Gas Operator | Jul 2002 |
| 1485 | Wychgram Daniel C | Thermopolis, WY 82443 | Oil Operator | Feb 2001 |
| 1486 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 1487 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Aug 2025 |
| 1488 | Wyoming Mineral Exploration LLC | Casper, WY 82602 | Oil Operator | Dec 2006 |
| 1489 | Wyoming Oil & Minerals Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 2001 |
| 1490 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 1491 | Wyoming Western Oil | Pine Bluffs, WY 82082 | Oil Operator | Sep 2019 |
| 1492 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 1493 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 1494 | Xoil Inc | Aurora, CO 80016 | Oil & Gas Operator | Jul 2023 |
| 1495 | XPR Wyoming LLC | | Oil & Gas Operator | Jan 2026 |
| 1496 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 1497 | Yates Drilling Company | Artesia, NM 88210 | Oil & Gas Operator | Dec 2021 |
| 1498 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 1499 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 1500 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Feb 2026 |