| 3201 | Dudley Oil Co. | Crane, TX 79731 | Oil & Gas Operator | Jan 2006 |
| 3202 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Mar 2026 |
| 3203 | Dugger, Glenn | Alice, TX 78332 | Oil & Gas Operator | Nov 2013 |
| 3204 | Duke Operating Company | Graham, TX 76450 | Oil Operator | Jun 2026 |
| 3205 | Duke, M. L. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2008 |
| 3206 | Duke, M.A. "Andy", Jr. | Montague, TX 76251 | Oil & Gas Operator | Jun 2023 |
| 3207 | Dula Production, LLC | Stockdale, TX 78160 | Oil Operator | Jun 2026 |
| 3208 | Dunbar, Ron, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2012 |
| 3209 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Jun 2026 |
| 3210 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 3211 | Duncan Energy LLC | Dallas, TX 75231 | Oil & Gas Operator | Jun 2026 |
| 3212 | Duncan Land & Exploration, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 3213 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 3214 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 3215 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 3216 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 3217 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 3218 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 3219 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 3220 | Dune Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1997 |
| 3221 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Jun 2026 |
| 3222 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 3223 | Dunlap Exploration, Inc. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2016 |
| 3224 | Dunlap, Rodge | Olney, TX 76374 | Oil & Gas Operator | Aug 2002 |
| 3225 | Dunn Resources, LLC | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2023 |
| 3226 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 3227 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 3228 | Duplantis Energy, LLC | Pleasanton, TX 78064 | Oil Operator | Jun 2026 |
| 3229 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 3230 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Jun 2026 |
| 3231 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 3232 | Durst Oil Company | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Sep 2000 |
| 3233 | Duster Production, Inc. | Refugio, TX 78377 | Oil & Gas Operator | Oct 2011 |
| 3234 | Duval Gas Gathering Corporation | Austin, TX 78711 | Oil & Gas Operator | Jun 2026 |
| 3235 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | Jun 2026 |
| 3236 | DWR Oil Company | Merkel, TX 79536 | Oil & Gas Operator | Aug 2025 |
| 3237 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 3238 | Dyersdale Energy, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 3239 | Dyersdale Production Co, Inc. | Houston, TX 77019 | Oil & Gas Operator | Jun 2026 |
| 3240 | Dym Energy, Inc. | Celina, TX 75009 | Oil & Gas Operator | Apr 2018 |
| 3241 | Dynamic Offshore Res. NS, LLC | Houston, TX 77010 | Oil & Gas Operator | May 2010 |
| 3242 | Dynamic Offshore Resources, LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2026 |
| 3243 | Dynamic Petroleum Res., Inc. | Houston, TX 77068 | Oil & Gas Operator | Jul 1994 |
| 3244 | Dynamic Production, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 3245 | Dyne Oil & Gas,Inc. | Borger, TX 79008 | Oil & Gas Operator | Dec 2017 |
| 3246 | Dyson Energy Operating, LLC | Bryan, TX 77802 | Oil & Gas Operator | Jun 2018 |
| 3247 | E & B Equipment | Liberty, TX 77575 | Oil & Gas Operator | Feb 2010 |
| 3248 | E & E Construction Company | Wichita Falls, TX 76308 | Oil Operator | Jun 2026 |
| 3249 | E & E Drilling Co., Inc. | Wichita Falls, TX 76308 | Oil Operator | Jun 2026 |
| 3250 | E & G Wells Rehab Project LLC | Houston, TX 77071 | Oil Operator | Jun 2026 |
| 3251 | E & R Oil | San Angelo, TX 76906 | Oil & Gas Operator | Jun 2026 |
| 3252 | E & S Operating Company | Caddo, TX 76429 | Oil & Gas Operator | Feb 2018 |
| 3253 | E & W Oil, Inc. | Seguin, TX 78155 | Oil & Gas Operator | Jun 2026 |
| 3254 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 3255 | E L M Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | May 2000 |
| 3256 | E P C Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Jun 2026 |
| 3257 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 3258 | E W D Oil | Winters, TX 79567 | Oil & Gas Operator | Jun 2026 |
| 3259 | E&B Natural Resources MGT Corp | Bakersfield, CA 93308 | Oil & Gas Operator | Aug 2017 |
| 3260 | E-Cor, Inc. | Austin, TX 78734 | Gas Operator | Feb 1999 |
| 3261 | E-L Gas Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 3262 | E-P Oil Co. Inc. | Luling, TX 78648 | Oil & Gas Operator | Jun 2026 |
| 3263 | E. & H. Oil Company | Woodson, TX 76491 | Oil & Gas Operator | May 1998 |
| 3264 | E. T. Oil Company | Luling, TX 78648 | Oil & Gas Operator | Jun 2026 |
| 3265 | E. T. S. Enterprises, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jul 1996 |
| 3266 | E.A.T.E. Operating | Natalia, TX 78059 | Oil & Gas Operator | Jun 2026 |
| 3267 | E.C. Hindman Oil And Gas | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 3268 | E.C. Production, L.L.C. | Rosenberg, TX 77471 | Oil & Gas Operator | Jun 2026 |
| 3269 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 3270 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 3271 | E/T Petroleum Co. | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2014 |
| 3272 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 3273 | Eaa Operating, LLC | Perryton, TX 79070 | Oil & Gas Operator | Jun 2026 |
| 3274 | Eado Production, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Aug 2012 |
| 3275 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | Jun 2026 |
| 3276 | Eagle Energy | Midland, TX 79710 | Oil & Gas Operator | Aug 1994 |
| 3277 | Eagle Energy Acquisitions LP | Houston, TX 77002 | Oil & Gas Operator | Aug 2014 |
| 3278 | Eagle Energy Development Co | La Porte, TX 77571 | Oil & Gas Operator | Dec 2024 |
| 3279 | Eagle Energy Resources, LLC | La Porte, TX 77571 | Oil & Gas Operator | Jun 2026 |
| 3280 | Eagle Exploration Co., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2019 |
| 3281 | Eagle Ford Hunter Resources,Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2013 |
| 3282 | Eagle Ford Oil Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 3283 | Eagle Hydrocarbons (Texas) Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 3284 | Eagle Hydrocarbons Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 2020 |
| 3285 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Jun 2026 |
| 3286 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2026 |
| 3287 | Eagle Oil Management, LLC | Shreveport, LA 71106 | Oil & Gas Operator | Jun 2026 |
| 3288 | Eagle Operating | Midland, TX 79707 | Oil & Gas Operator | May 2013 |
| 3289 | Eagle Petroleum Corporation | Holliday, TX 76366 | Oil & Gas Operator | Oct 2005 |
| 3290 | Eagle Production, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 2026 |
| 3291 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Feb 2026 |
| 3292 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 3293 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 3294 | Eagle Valley Development LLC | Austin, TX 78738 | Oil & Gas Operator | Oct 2023 |
| 3295 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jun 2026 |
| 3296 | Eakin Brothers | Pampa, TX 79065 | Gas Operator | Jun 2026 |
| 3297 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | Jun 2026 |
| 3298 | Earth Science Exploration, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2012 |
| 3299 | Earthbound Energy LLC | Merkel, TX 79536 | Oil Operator | Jun 2026 |
| 3300 | Earthbound Resources LLC | Merkel, TX 79536 | Oil & Gas Operator | Jun 2026 |