| 1401 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 1402 | Winco Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 1997 |
| 1403 | Wind River Energy Commission | | Oil Operator | Mar 2026 |
| 1404 | Wind River Exploration | Powell, WY 82435 | Oil & Gas Operator | Jul 2026 |
| 1405 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 1406 | Winkler L W & Son | Denver, CO 80222 | Oil & Gas Operator | Dec 2001 |
| 1407 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 1408 | WLP Oil Inc | Gillette, WY 82717 | Oil & Gas Operator | Dec 2018 |
| 1409 | Wnu Energy LLC | Pinedale, WY 82941 | Oil & Gas Operator | Jul 2026 |
| 1410 | Wold Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2022 |
| 1411 | Wold John S | | Gas Operator | Feb 1991 |
| 1412 | Wold Oil & Gas | | Oil & Gas Operator | Oct 1996 |
| 1413 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 1414 | Wolf Energy Company | | Oil & Gas Operator | Dec 1985 |
| 1415 | Wolverine Operations LLC | Buffalo, WY 82834 | Gas Operator | Oct 2008 |
| 1416 | Wood River Oil & Refining Co | | Oil & Gas Operator | Dec 1998 |
| 1417 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 1418 | WPX Energy RM Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2014 |
| 1419 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | May 2026 |
| 1420 | WRC Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2026 |
| 1421 | Wulf Oil Co | | Oil & Gas Operator | Dec 1984 |
| 1422 | Wy Basin Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 1423 | Wyatt Petroleum Corporation | Evergreen, CO 80437 | Gas Operator | Jul 2002 |
| 1424 | Wychgram Daniel C | Thermopolis, WY 82443 | Oil Operator | Feb 2001 |
| 1425 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 1426 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Aug 2025 |
| 1427 | Wyoming Energy Partners LLC | | Oil Operator | Jul 2026 |
| 1428 | Wyoming Mineral Exploration LLC | Casper, WY 82602 | Oil Operator | Dec 2006 |
| 1429 | Wyoming Oil & Minerals Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 2001 |
| 1430 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 1431 | Wyoming Western Oil | Pine Bluffs, WY 82082 | Oil Operator | Sep 2019 |
| 1432 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 1433 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 1434 | Xoil Inc | Aurora, CO 80016 | Oil & Gas Operator | Jul 2023 |
| 1435 | XPR Wyoming LLC | | Oil & Gas Operator | Jun 2026 |
| 1436 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |