| 201 | Walker'S Well Service | Gladewater, TX 75647 | Oil & Gas Operator | Aug 2003 |
| 202 | Walker, Daniel J. | La Vernia, TX 78121 | Oil Operator | Dec 2025 |
| 203 | Walker, Ervin Gilbert | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2020 |
| 204 | Walker, Harrel L. | La Vernia, TX 78121 | Oil & Gas Operator | May 2023 |
| 205 | Walker, Kent | Midland, TX 79704 | Oil & Gas Operator | Jun 2004 |
| 206 | Walker, Tigner | Shreveport, LA 71138 | Oil & Gas Operator | Feb 2005 |
| 207 | Walker-Wilson | | Oil & Gas Operator | Jul 1999 |
| 208 | Walking X Oil Co. | Whiteface, TX 79379 | Oil & Gas Operator | Dec 2025 |
| 209 | Wall Shelby | | Oil & Gas Operator | Oct 1998 |
| 210 | Wallace D. Putman, Jr. | | Oil Operator | Jan 2025 |
| 211 | Wallace Energy I | | Oil Operator | Mar 1990 |
| 212 | Wallace Energy Inc | Denver, CO 80202-4327 | Oil Operator | Jun 2015 |
| 213 | Wallace George C | Oklahoma City, OK 73120-0135 | Oil Operator | Nov 1994 |
| 214 | Wallace John J Jr | Cooperstown, PA 16317-1909 | Oil & Gas Operator | Dec 2024 |
| 215 | Wallace Oil & Ga | | Gas Operator | Oct 1995 |
| 216 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Dec 2025 |
| 217 | Wallace Operating Company | | Oil & Gas Operator | Sep 1986 |
| 218 | Wallace Operating Company LLC | Metairie, LA 70003 | Gas Operator | Dec 2025 |
| 219 | Wallace Sherrie D | Dewey, OK 74029 | Oil & Gas Operator | Oct 2025 |
| 220 | Wallace, Sharon J. | Clymer, NY 14724 | Gas Operator | Dec 2024 |
| 221 | Wallen Production Co. | Midland, TX 79702 | Oil & Gas Operator | Aug 1996 |
| 222 | Waller Brothers Inc | | Oil & Gas Operator | Jul 2004 |
| 223 | Waller Oil, LLC | Stockton, KS 67669 | Oil Operator | Jun 2025 |
| 224 | Waller, C.W. Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 225 | Wallick Petroleum Co | Reynoldsburg, OH 43068 | Oil & Gas Operator | Dec 1994 |
| 226 | Walling, Buster H | | Oil Operator | Jul 2022 |
| 227 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 228 | Walls Energy, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 229 | Walls, Charles A. | Caney, KS 67333 | Oil Operator | Aug 2016 |
| 230 | Walls, G. M. & Frances, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 231 | Wallway M J | Casper, WY 82601 | Oil & Gas Operator | Jan 1993 |
| 232 | Wally Tucker | | Gas Operator | Dec 1994 |
| 233 | Walrath Oil Co. LLC | | Oil Operator | Nov 2025 |
| 234 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Dec 2025 |
| 235 | Walsh Jr F Howard | Fort Worth, TX 76102-4773 | Oil & Gas Operator | Sep 2025 |
| 236 | Walsh Jr F Howard Opr Co Inc | Fort Worth, TX 76102-4773 | Oil & Gas Operator | Feb 2016 |
| 237 | Walsh Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2022 |
| 238 | Walsh Production Inc | | Oil & Gas Operator | Dec 2007 |
| 239 | Walsh Resources, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 2025 |
| 240 | Walsh, F H Jr. Operating Co. Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2019 |
| 241 | Walsh, F. Howard, Jr. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 1994 |
| 242 | Walter Black Warrior Basin LLC | | Gas Operator | Dec 2014 |
| 243 | Walter E & Bernice N Darnall | | Oil Operator | Oct 2025 |
| 244 | Walter Exploration Company | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 245 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 246 | Walter H. Husfeld Oil Co LLC | Bowie, TX 76230 | Oil & Gas Operator | Dec 2025 |
| 247 | Walter Jonathan S Dba JMW Operating | Twin City, GA 30471 | Oil Operator | Oct 2025 |
| 248 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 249 | Walter Parker Inc | Talala, OK 74080-3808 | Oil & Gas Operator | Sep 2025 |
| 250 | Walter T. Lanaux | | Oil & Gas Operator | Nov 1990 |
| 251 | Walter W. Heard, Jr. | | Oil & Gas Operator | Dec 1995 |
| 252 | Walters Drilling | | Oil Operator | Mar 1988 |
| 253 | Walters Frank | Pernell, OK 73076 | Oil & Gas Operator | Sep 2014 |
| 254 | Walters Oil Company | Elmore City, OK 73433-9505 | Oil & Gas Operator | Nov 2025 |
| 255 | Walters Oil LLC | Elmore City, OK 73433-8637 | Oil Operator | Apr 2020 |
| 256 | Walters Oil Well Service Inc | Walters, OK 73572-0467 | Oil & Gas Operator | Nov 2000 |
| 257 | Walters Production | | Oil Operator | Mar 2005 |
| 258 | Walterscheid, A. D. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2014 |
| 259 | Walterscheid, R. F. | Muenster, TX 76252 | Oil & Gas Operator | Oct 1993 |
| 260 | Waltman Family LP | Maud, OK 74854-2603 | Oil Operator | Oct 2025 |
| 261 | Waltman Oil & Gas | Maud, OK 74854-9739 | Oil Operator | Sep 2001 |
| 262 | Walton Producing Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2005 |
| 263 | Walton Producing Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 264 | Walton Properties LTD. | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 265 | Walton W W & Beatrice F | Breckenridge, TX 76024 | Gas Operator | Jul 2002 |
| 266 | Walton, James A. | Midland, TX 79702 | Oil & Gas Operator | Oct 1994 |
| 267 | Walton, Tara | Copan, OK 74022 | Oil Operator | Aug 2025 |
| 268 | Walton, W. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 1994 |
| 269 | Wam Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Dec 2016 |
| 270 | Wandering Star Partners #1 LLLP | | Oil & Gas Operator | Apr 2015 |
| 271 | Wandoo Energy, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Dec 2025 |
| 272 | Wandover Charles T SR | Inverness, FL 34452-7527 | Oil & Gas Operator | Dec 2024 |
| 273 | Wapco, Inc. | Cement, OK 73017 | Oil Operator | Oct 2025 |
| 274 | Wapi Operating LLC | McCurtain, OK 74944 | Oil & Gas Operator | Oct 2025 |
| 275 | Wapiti Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Jul 2006 |
| 276 | Wapiti Oil & Gas LLC | Houston, TX 77024 | Oil Operator | Dec 2011 |
| 277 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Dec 2025 |
| 278 | Wapiti Petroleum, LLC | | Oil & Gas Operator | Sep 2025 |
| 279 | War Cry, LLC | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 280 | Warbonnet Exploration Company | Houston, TX 77056 | Oil & Gas Operator | Apr 2016 |
| 281 | Ward & Son* Alfred | | Oil & Gas Operator | Jul 2021 |
| 282 | Ward Feed Yard, Inc. | Larned, KS 67550 | Oil & Gas Operator | Mar 2016 |
| 283 | Ward Kelly | Drumright, OK 74030-5661 | Oil & Gas Operator | Feb 2015 |
| 284 | Ward M Haggard Oil And Gas Exploration Inc | | Oil Operator | Dec 2025 |
| 285 | Ward Oil Co. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 286 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 287 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Oct 2025 |
| 288 | Ward Trust | Spring, TX 77383 | Oil & Gas Operator | May 2013 |
| 289 | Ward Williston Drilling Co | | Oil & Gas Operator | Dec 1994 |
| 290 | Ward, Charles Oil Company | Olney, TX 76374 | Oil Operator | Dec 2025 |
| 291 | Ward, E. B. | Alice, TX 78333 | Oil & Gas Operator | Jun 2001 |
| 292 | Ward, L. S. | Graham, TX 76450 | Oil & Gas Operator | Jun 2001 |
| 293 | Ward, Ted G. Jr. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2000 |
| 294 | Ward-Williston Company | | Oil & Gas Operator | Apr 2014 |
| 295 | Ware House Industries | Casper, WY 82605 | Oil & Gas Operator | Dec 2013 |
| 296 | Ware Jimmy M | Seminole, OK 74868 | Oil & Gas Operator | Nov 1998 |
| 297 | Ware, Lonnie | | Oil & Gas Operator | Oct 2025 |
| 298 | Warfield John E | Cleo Springs, OK 73729-9723 | Oil & Gas Operator | Jul 2005 |
| 299 | Warfield Management, LLC | Newman, GA 30263 | Gas Operator | Dec 2021 |
| 300 | Warhorse Oil & Gas, LLC | | Oil & Gas Operator | Dec 2018 |