| 1401 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 1402 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Dec 2025 |
| 1403 | Wexpro Development Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Nov 2025 |
| 1404 | Wexpro II Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Nov 2025 |
| 1405 | Wheless Drilling Company | | Oil & Gas Operator | Dec 1989 |
| 1406 | Whisler Enterprise Company | Erie, CO 80516 | Oil & Gas Operator | Jan 2026 |
| 1407 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 1408 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1409 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 1410 | Wilbanks Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1411 | Wildfire Partners Inc | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2009 |
| 1412 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 1413 | Williams Ted H | | Oil & Gas Operator | Dec 2008 |
| 1414 | Williston Basin Cosul-Profit SH | | Oil Operator | Dec 1989 |
| 1415 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 1416 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 1417 | Winco Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 1997 |
| 1418 | Wind River Energy Commission | | Oil Operator | Jan 2026 |
| 1419 | Wind River Exploration | Powell, WY 82435 | Oil & Gas Operator | Jan 2026 |
| 1420 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 1421 | Winkler L W & Son | Denver, CO 80222 | Oil & Gas Operator | Dec 2001 |
| 1422 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 1423 | WLP Oil Inc | Gillette, WY 82717 | Oil & Gas Operator | Dec 2018 |
| 1424 | Wnu Energy LLC | Pinedale, WY 82941 | Oil & Gas Operator | Jan 2026 |
| 1425 | Wold Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2022 |
| 1426 | Wold John S | | Gas Operator | Feb 1991 |
| 1427 | Wold Oil & Gas | | Oil & Gas Operator | Oct 1996 |
| 1428 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 1429 | Wolf Energy Company | | Oil & Gas Operator | Dec 1985 |
| 1430 | Wolverine Operations LLC | Buffalo, WY 82834 | Gas Operator | Oct 2008 |
| 1431 | Wood River Oil & Refining Co | | Oil & Gas Operator | Dec 1998 |
| 1432 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 1433 | WPX Energy RM Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2014 |
| 1434 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2025 |
| 1435 | WRC Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2025 |
| 1436 | Wulf Oil Co | | Oil & Gas Operator | Dec 1984 |
| 1437 | Wy Basin Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 1438 | Wyatt Petroleum Corporation | Evergreen, CO 80437 | Gas Operator | Jul 2002 |
| 1439 | Wychgram Daniel C | Thermopolis, WY 82443 | Oil Operator | Feb 2001 |
| 1440 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 1441 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Aug 2025 |
| 1442 | Wyoming Mineral Exploration LLC | Casper, WY 82602 | Oil Operator | Dec 2006 |
| 1443 | Wyoming Oil & Minerals Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 2001 |
| 1444 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 1445 | Wyoming Western Oil | Pine Bluffs, WY 82082 | Oil Operator | Sep 2019 |
| 1446 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 1447 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1448 | Xoil Inc | Aurora, CO 80016 | Oil & Gas Operator | Jul 2023 |
| 1449 | XPR Wyoming LLC | | Oil & Gas Operator | Dec 2025 |
| 1450 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 1451 | Yates Drilling Company | Artesia, NM 88210 | Oil & Gas Operator | Dec 2021 |
| 1452 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 1453 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 1454 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Oct 2025 |
| 1455 | Zavanna Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 1456 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 1457 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |