| 5201 | Wolfe Oil | Bremen, OH 43107 | Oil Operator | Dec 2024 |
| 5202 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 5203 | Womack & Nelson | | Gas Operator | Feb 1987 |
| 5204 | Womack & Price | | Oil & Gas Operator | Oct 1990 |
| 5205 | Womack Prod Co. | | Oil Operator | Feb 1996 |
| 5206 | Wood Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jun 1999 |
| 5207 | Wood Exploration Corporation | | Oil & Gas Operator | Jan 1999 |
| 5208 | Woodall Oil Company | | Oil Operator | Sep 2010 |
| 5209 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 5210 | Woodbine Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 5211 | Woodco Oil And Gas Company | | Gas Operator | Nov 1981 |
| 5212 | Woodland Hills Oil & Gas, LLC | | Oil Operator | Dec 2024 |
| 5213 | Woodlawn Energy Dev., L.L.C. | | Oil & Gas Operator | Aug 2006 |
| 5214 | Woodpecker Corp. | | Oil & Gas Operator | Dec 2024 |
| 5215 | Woodrow Wilson | | Gas Operator | Dec 1994 |
| 5216 | Woods & Deas | | Oil & Gas Operator | Jan 1984 |
| 5217 | Woods & Deas-Dobie | | Oil & Gas Operator | Aug 1983 |
| 5218 | Woods Operating Co., Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Dec 2020 |
| 5219 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 5220 | Woods, Et Al | | Gas Operator | Sep 1990 |
| 5221 | Wooldridge Land & Cattle, LLC | | Oil Operator | Jan 2025 |
| 5222 | Wooldridge Production Co.,LTD. | | Oil & Gas Operator | Apr 2008 |
| 5223 | Wooldridge Production, L.L.C. | | Oil Operator | Mar 2005 |
| 5224 | Woolf & Magee, Inc. | | Oil & Gas Operator | Oct 1991 |
| 5225 | Workover One, Inc. | | Oil & Gas Operator | Jul 1989 |
| 5226 | World Oil & Gas Expl., Inc. | | Oil & Gas Operator | Mar 1988 |
| 5227 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 5228 | Worldwide Energy Corporation | Freer, TX 78357 | Oil & Gas Operator | Jan 1997 |
| 5229 | Wright Production Company | | Oil Operator | Jun 1990 |
| 5230 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |
| 5231 | WSF, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2013 |
| 5232 | Wylee Petroleum Corporation | | Oil & Gas Operator | Dec 1984 |
| 5233 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 5234 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 5235 | Wytex Production Corporation | Fort Smith, AR 72903 | Oil & Gas Operator | Nov 2025 |
| 5236 | XCL-Louisiana, Inc. | | Oil & Gas Operator | Aug 1993 |
| 5237 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 5238 | Xplor Energy Operating Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 2012 |
| 5239 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 5240 | Xtra Energy Corporation | | Oil & Gas Operator | Jun 1989 |
| 5241 | Yasny Corporation | | Oil Operator | Nov 1991 |
| 5242 | Yates Oil Company | | Oil Operator | Jul 1990 |
| 5243 | Yellow Dog Oil Company | | Oil Operator | Apr 1988 |
| 5244 | Yellow Rock, LLC | | Oil & Gas Operator | Dec 2024 |
| 5245 | Yentzen Investments, Inc. | Sugar Land, TX 77478 | Oil Operator | May 1993 |
| 5246 | Yentzen Production, Inc. | | Oil Operator | Mar 1987 |
| 5247 | Youngblood Enterprises | | Gas Operator | Dec 1983 |
| 5248 | Youngblood Enterprises, Inc. | | Oil & Gas Operator | Jan 1992 |
| 5249 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 5250 | Yuma Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2002 |
| 5251 | Z C Ambrose-G L Blaxton, Jr. | | Oil & Gas Operator | Apr 1983 |
| 5252 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2026 |
| 5253 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Feb 2026 |
| 5254 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 5255 | Zad, Inc. | | Oil Operator | May 2001 |
| 5256 | Zadeck Energy Group, Inc. | | Oil & Gas Operator | Dec 2011 |
| 5257 | Zam'S Production Company | | Oil Operator | Sep 2004 |
| 5258 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 5259 | Zeagler Enterprises, Inc. | | Oil & Gas Operator | Jun 2008 |
| 5260 | Zeit Exploration Co., Inc. | | Oil & Gas Operator | May 1994 |
| 5261 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 5262 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |
| 5263 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |
| 5264 | Zero Mass Mining, LLC | | Oil Operator | Jan 2025 |
| 5265 | Zgen, Inc. | | Oil & Gas Operator | Jul 1990 |
| 5266 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 5267 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 5268 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 5269 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |