| 401 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 402 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 403 | Wheless Industries-Pelto Oil | | Oil & Gas Operator | Dec 1989 |
| 404 | Wildhorse Resources Management Co, LLC | | Oil & Gas Operator | Feb 2018 |
| 405 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 406 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2024 |
| 407 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2024 |
| 408 | Williamson & Smitherman | | Oil & Gas Operator | Dec 2008 |
| 409 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2023 |
| 410 | Williamson Pumping Ser., Inc. | | Oil Operator | Dec 2023 |
| 411 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 412 | Wright Production Company | | Oil Operator | Jun 1990 |
| 413 | WSF, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2013 |
| 414 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2024 |
| 415 | Yates Oil Company | | Oil Operator | Jul 1990 |
| 416 | Youngblood Enterprises, Inc. | | Oil & Gas Operator | Jan 1992 |
| 417 | Zeagler Enterprises, Inc. | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2009 |
| 418 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |