| 3201 | Drillogix Exploration LLC | Breckenridge, TX 76424 | Oil Operator | Oct 2025 |
| 3202 | Drilmor, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 1998 |
| 3203 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Oct 2025 |
| 3204 | DRS Exploration Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 1999 |
| 3205 | Drum Oil & Gas, Inc. | Houston, TX 77082 | Oil & Gas Operator | Oct 2025 |
| 3206 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 3207 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 3208 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 3209 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 3210 | DSB Energy, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 3211 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 3212 | DSR Oil & Gas, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 3213 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 3214 | DSW Production Corp. | Houston, TX 77265 | Oil & Gas Operator | Oct 2025 |
| 3215 | DSX Operating Co. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 2008 |
| 3216 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 3217 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 3218 | Dual Production Partners, LLC | Nacogdoches, TX 75963 | Oil & Gas Operator | Oct 2025 |
| 3219 | Dual Quiver Oil & Gas Op, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Oct 2025 |
| 3220 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | Oct 2025 |
| 3221 | Duderstadt, A. R. | Boling, TX 77420 | Oil & Gas Operator | Oct 2025 |
| 3222 | Dudley Oil Co. | Crane, TX 79731 | Oil & Gas Operator | Jan 2006 |
| 3223 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Jul 2025 |
| 3224 | Dugger, Glenn | Alice, TX 78332 | Oil & Gas Operator | Nov 2013 |
| 3225 | Duke Operating Company | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 3226 | Duke, M. L. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2008 |
| 3227 | Duke, M.A. "Andy", Jr. | Montague, TX 76251 | Oil & Gas Operator | Jun 2023 |
| 3228 | Dula Production, LLC | Stockdale, TX 78160 | Oil Operator | Oct 2025 |
| 3229 | Dunbar, Ron, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2012 |
| 3230 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 3231 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 3232 | Duncan Energy LLC | Dallas, TX 75231 | Oil & Gas Operator | Oct 2025 |
| 3233 | Duncan Land & Exploration, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 3234 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 3235 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 3236 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 3237 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 3238 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 3239 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 3240 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 3241 | Dune Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1997 |
| 3242 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Oct 2025 |
| 3243 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 3244 | Dunlap Exploration, Inc. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2016 |
| 3245 | Dunlap, Rodge | Olney, TX 76374 | Oil & Gas Operator | Aug 2002 |
| 3246 | Dunn Resources, LLC | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2023 |
| 3247 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 3248 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 3249 | Duplantis Energy, LLC | Pleasanton, TX 78064 | Oil Operator | Oct 2025 |
| 3250 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 3251 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 3252 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 3253 | Durst Oil Company | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Sep 2000 |
| 3254 | Duster Production, Inc. | Refugio, TX 78377 | Oil & Gas Operator | Oct 2011 |
| 3255 | Duval Gas Gathering Corporation | Austin, TX 78711 | Oil & Gas Operator | Oct 2025 |
| 3256 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | Oct 2025 |
| 3257 | DWR Oil Company | Merkel, TX 79536 | Oil & Gas Operator | Aug 2025 |
| 3258 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 3259 | Dyersdale Energy, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 3260 | Dyersdale Production Co, Inc. | Houston, TX 77019 | Oil & Gas Operator | Oct 2025 |
| 3261 | Dym Energy, Inc. | Celina, TX 75009 | Oil & Gas Operator | Apr 2018 |
| 3262 | Dynamic Offshore Res. NS, LLC | Houston, TX 77010 | Oil & Gas Operator | May 2010 |
| 3263 | Dynamic Offshore Resources, LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 3264 | Dynamic Petroleum Res., Inc. | Houston, TX 77068 | Oil & Gas Operator | Jul 1994 |
| 3265 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |
| 3266 | Dyne Oil & Gas,Inc. | Borger, TX 79008 | Oil & Gas Operator | Dec 2017 |
| 3267 | Dyson Energy Operating, LLC | Bryan, TX 77802 | Oil & Gas Operator | Jun 2018 |
| 3268 | E & B Equipment | Liberty, TX 77575 | Oil & Gas Operator | Feb 2010 |
| 3269 | E & E Construction Company | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 3270 | E & E Drilling Co., Inc. | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 3271 | E & G Wells Rehab Project LLC | Houston, TX 77071 | Oil Operator | Oct 2025 |
| 3272 | E & R Oil | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 3273 | E & S Operating Company | Caddo, TX 76429 | Oil & Gas Operator | Feb 2018 |
| 3274 | E & W Oil, Inc. | Seguin, TX 78155 | Oil & Gas Operator | Oct 2025 |
| 3275 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 3276 | E L M Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | May 2000 |
| 3277 | E P C Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2025 |
| 3278 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 3279 | E W D Oil | Winters, TX 79567 | Oil & Gas Operator | Oct 2025 |
| 3280 | E&B Natural Resources MGT Corp | Bakersfield, CA 93308 | Oil & Gas Operator | Aug 2017 |
| 3281 | E-Cor, Inc. | Austin, TX 78734 | Gas Operator | Feb 1999 |
| 3282 | E-L Gas Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 3283 | E-P Oil Co. Inc. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 3284 | E. & H. Oil Company | Woodson, TX 76491 | Oil & Gas Operator | May 1998 |
| 3285 | E. T. Oil Company | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 3286 | E. T. S. Enterprises, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jul 1996 |
| 3287 | E.A.T.E. Operating | Natalia, TX 78059 | Oil & Gas Operator | Oct 2025 |
| 3288 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 3289 | E.C. Production, L.L.C. | Rosenberg, TX 77471 | Oil & Gas Operator | Oct 2025 |
| 3290 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 3291 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 3292 | E/T Petroleum Co. | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2014 |
| 3293 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2025 |
| 3294 | Eaa Operating, LLC | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 3295 | Eado Production, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Aug 2012 |
| 3296 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | Oct 2025 |
| 3297 | Eagle Energy | Midland, TX 79710 | Oil & Gas Operator | Aug 1994 |
| 3298 | Eagle Energy Acquisitions LP | Houston, TX 77002 | Oil & Gas Operator | Aug 2014 |
| 3299 | Eagle Energy Development Co | La Porte, TX 77571 | Oil & Gas Operator | Dec 2024 |
| 3300 | Eagle Energy Resources, LLC | La Porte, TX 77571 | Oil & Gas Operator | Oct 2025 |