| 1501 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 1502 | Wolf Energy Company | | Oil & Gas Operator | Dec 1985 |
| 1503 | Wolverine Operations LLC | Buffalo, WY 82834 | Gas Operator | Oct 2008 |
| 1504 | Wood River Oil & Refining Co | | Oil & Gas Operator | Dec 1998 |
| 1505 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 1506 | WPX Energy RM Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2014 |
| 1507 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | May 2025 |
| 1508 | WRC Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | May 2025 |
| 1509 | Wulf Oil Co | | Oil & Gas Operator | Dec 1984 |
| 1510 | Wyatt Petroleum Corporation | Evergreen, CO 80437 | Gas Operator | Jul 2002 |
| 1511 | Wychgram Daniel C | Thermopolis, WY 82443 | Oil Operator | Feb 2001 |
| 1512 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 1513 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Apr 2025 |
| 1514 | Wyoming Energy Partners LLC | | Oil Operator | Jun 2025 |
| 1515 | Wyoming Mineral Exploration LLC | Casper, WY 82602 | Oil Operator | Dec 2006 |
| 1516 | Wyoming Oil & Minerals Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 2001 |
| 1517 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 1518 | Wyoming Western Oil | Pine Bluffs, WY 82082 | Oil Operator | Sep 2019 |
| 1519 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 1520 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 1521 | Xoil Inc | Aurora, CO 80016 | Oil & Gas Operator | Jul 2023 |
| 1522 | XPR Wyoming LLC | | Oil & Gas Operator | May 2025 |
| 1523 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 1524 | Yates Drilling Company | Artesia, NM 88210 | Oil & Gas Operator | Dec 2021 |
| 1525 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 1526 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 1527 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Jun 2025 |
| 1528 | Zavanna Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 1529 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 1530 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |