| 1501 | Wyatt Petroleum Corporation | Evergreen, CO 80437 | Gas Operator | Jul 2002 |
| 1502 | Wychgram Daniel C | Thermopolis, WY 82443 | Oil Operator | Feb 2001 |
| 1503 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 1504 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Sep 2024 |
| 1505 | Wyoming Mineral Exploration LLC | Casper, WY 82602 | Oil Operator | Dec 2006 |
| 1506 | Wyoming Oil & Minerals Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 2001 |
| 1507 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 1508 | Wyoming Western Oil | Pine Bluffs, WY 82082 | Oil Operator | Sep 2019 |
| 1509 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 1510 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 1511 | Xoil Inc | Aurora, CO 80016 | Oil & Gas Operator | Jul 2023 |
| 1512 | XPR Wyoming LLC | | Oil & Gas Operator | Sep 2024 |
| 1513 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Nov 2024 |
| 1514 | Yates Drilling Company | Artesia, NM 88210 | Oil & Gas Operator | Dec 2021 |
| 1515 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 1516 | Young, Marshall R., Oil Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 1517 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Oct 2024 |
| 1518 | Zavanna Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 1519 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2024 |
| 1520 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |