| 401 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 402 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jul 2024 |
| 403 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2024 |
| 404 | Wilson Operating Service Inc | Brownfield, TX 79316 | Oil & Gas Operator | Aug 2003 |
| 405 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |
| 406 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 407 | Wisenbaker Production Company | Tyler, TX 75702 | Oil & Gas Operator | Oct 2011 |
| 408 | WJW Operating Co.,LLC | Austin, TX 78738 | Oil & Gas Operator | May 2002 |
| 409 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 410 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 411 | Worldwide Exploration, Inc | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2002 |
| 412 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 413 | Yep, LLC | Palestine, TX 75802 | Oil Operator | Jan 2017 |
| 414 | Young, Marshall R., Oil Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 415 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2024 |