| Keystone Mills Co. G-3-203245 | Highmark Energy Operating, LLC only | Conroe (Middle Wilcox Cons.) | Montgomery | 1 | 336 | 110K | Aug 2004 – Oct 2024 |
| Blacknall, J.C. G-4-150129 | Synergy Production Company only | Turkey Creek (5370) | Nueces | 1 | 335 | 4.07K | Jan 1994 – Aug 1994 |
| Key O-13-28284 | Rogers Drilling Co. only | Archer County Regular | Archer | 1 | 331 | 5 | Jan 1993 – May 1993 |
| Parkey B O-13-29026 | Rogers Drilling Co. only | Parkey, South (Miss) | Archer | 1 | 328 | 0 | Sep 1995 – Sep 1995 |
| McGrede G-6-283968 | Neches Exploration, L.L.C. only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 327 | 61K | Feb 2018 – Apr 2026 |
| Turkey Creek G-8-107130 | J-Tec Operating, LLC only | Mineral Wells (Congl 4540) | Palo Pinto | 1 | 327 | 330K | Jan 1993 – Nov 2025 |
| Soape, C. D., Mrs. G-6-70201 | Key Energy of Colorado, Inc. only | Paxton (Hill) | Panola | 1 | 325 | 71.9K | Jan 1993 – Feb 2010 |
| Ellis, Carl "F" G-14-159493 | Amoco Production Company only | Ellis Ranch (Keys) | Ochiltree | 1 | 319 | 192K | May 1996 – Mar 2000 |
| Rogers "A" G-14-234076 | Presidio Petroleum LLC only | Shreikey (Granite Wash) | Roberts | 1 | 318 | 49K | Nov 2007 – Dec 2009 |
| Askey "C" G-13-177158 | Lime Rock Resources IV-a, L.P. only | Newark, East (Barnett Shale) | Wise | 1 | 316 | 1.14M | Apr 2000 – Apr 2026 |
| Askey, W. A. "B" G-13-174938 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 316 | 1.28M | Sep 1999 – Apr 2026 |
| Huskey G-13-212187 | Case Resources, LLC only | Newark, East (Barnett Shale) | Jack | 1 | 307 | 235K | Sep 2005 – Aug 2024 |
| Pogo Walton B G-10-127781 | Hilcorp Energy Company only | Keystone (Ellenburger) | Winkler | 1 | 303 | 4.23M | Jan 1993 – Dec 2025 |
| Mackey, L. L. Estate Unit G-6-73382 | Craton Operating LLC only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 300 | 18.6K | Jan 1993 – Jun 1994 |
| South Keystone/Ellen/Unit G-10-240059 | Basin Oil & Gas Operating, LLC only | Keystone (Ellenburger) | Winkler | 1 | 300 | 54.9K | Feb 2008 – Jul 2016 |
| McCluskey G-8-42889 | Petex only | Rickels (Conglomerate) | Stephens | 1 | 300 | 160K | Jan 1993 – Apr 2020 |
| Caskey, K G-13-70449 | Herring, Ray only | Red Top (Caddo) | Young | 1 | 297 | 21.3K | Jan 1993 – Dec 1995 |
| Mackey, Bill G-6-179879 | Enerquest Corporation only | Willow Springs (Travis Peak) | Gregg | 1 | 296 | 32.8K | Oct 2000 – Nov 2001 |
| Coles,jr.,arthur Ray G-2-175290 | Hankey Oil Company only | Kerlick (Yegua) | Goliad | 1 | 294 | 100K | Sep 1999 – Jan 2000 |
| Askey, W. A. G-13-286714 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 292 | 2.12M | Jan 2019 – Apr 2026 |
| McCleskey G-8-132161 | Mehaffey Investments, Inc. only | Hanvey (Lake Sand) | Eastland | 1 | 291 | 20.2K | Jan 1993 – Sep 1998 |
| McCluskey O-13-26939 | Herring, Ray only | Young County Regular | Young | 1 | 290 | 17.7K | Jan 1993 – Feb 1994 |
| Simons, K. G-2-149348 | Carter Exploration Company only | Buckeye Knoll (Yegua 4760) | Live Oak | 1 | 288 | 12.7K | Mar 1994 – May 1994 |
| Key O-1-19194 | Southwest Resources, Inc. only | Minerva-Rockdale | Milam | 1 | 284 | 0 | Dec 2017 – Oct 2024 |
| Mulkey 2H O-13-30342 | Trio Consulting & Management,llc only | Thrash (Chappel) | Hardeman | 1 | 282 | 0 | Mar 2004 – Mar 2004 |
| BSR Parkey 'S' O-13-32712 | Bulwark Oil & Gas, LLC only | H. F. F. (Caddo) | Archer | 1 | 280 | 0 | Dec 2012 – May 2013 |
| Lackey GU G-14-201173 | Kodiak Oil & Gas, Inc. only | Pan Petro (Cleveland) | Hansford | 1 | 278 | 850K | Mar 2004 – Mar 2026 |
| Askey "C" G-13-207203 | Lime Rock Resources IV-a, L.P. only | Newark, East (Barnett Shale) | Wise | 1 | 277 | 1.15M | Feb 2005 – Apr 2026 |
| Gill, John G-5-43045 | Spence, Ralph Oil Company, Inc. only | Pokey (Rodessa) | Limestone | 1 | 277 | 43.2K | Jan 1993 – Oct 1998 |
| Shockey O-6-13312 | Marathon Oil Company only | Wildcat | Sabine | 1 | 277 | 2 | Nov 1993 – Dec 1993 |
| Lackey G-14-83273 | Sandlot Oil & Gas LLC only | Hansford (Morrow, Lower) | Hansford | 1 | 276 | 732K | Jan 1993 – Mar 2026 |
| Jenkins, Ben, Etal-B- O-10-51714 | Hilcorp Energy Company only | Keystone (Dev-McKee Cons) | Winkler | 2 | 274 | 2.87K | Mar 2019 – Nov 2025 |
| Key Deep GU G-6-262310 | Sabine Energy Inc. only | Carthage (Haynesville Shale) | Harrison | 1 | 274 | 2.21M | May 2011 – Apr 2026 |
| Walton, J. B. G-10-155378 | Hilcorp Energy Company only | Keystone (Ellenburger) | Winkler | 1 | 272 | 2.29M | Aug 1995 – Apr 2026 |
| Campbell, Seth O-10-14488 | Xeric Oil & Gas Corporation only | Keystone (Clear Fork) | — | 0 | 271 | 0 | Jun 2004 – Jun 2004 |
| McMillan, C. L. O-9-14612 | TXP, Incorporated only | R. E. G. (Harkey) | Schleicher | 1 | 266 | 153 | May 1997 – Apr 1998 |
| Polk, J.K. O-6-13327 | Key Petroleum Inc. only | Slocum | Anderson | 1 | 264 | 6 | Jun 1994 – Nov 1994 |
| Walton, J. B. G-10-120461 | Bass Enterprises Production Co. only | Keystone (Colby) | Winkler | 1 | 259 | 20.9K | Jan 1993 – Jul 1995 |
| Keyser "C" O-13-21591 | Western Chief Operating, L.L.C. only | Brazeel (Mississippian) | Young | 1 | 258 | 0 | Oct 1995 – Feb 2018 |
| Walton, J. B. G-10-153731 | Hilcorp Energy Company only | Keystone (Ellenburger) | Winkler | 1 | 257 | 4.85M | Mar 1995 – Dec 2025 |
| Fogleman, Mrs. Clydelle G-6-153347 | Key Energy of Colorado, Inc. only | Paxton (Paluxy) | Panola | 1 | 256 | 97.6K | Sep 1994 – Aug 2003 |
| Walton, J. B. G-10-116818 | Hilcorp Energy Company only | Keystone (Colby) | Winkler | 1 | 255 | 970K | Jan 1993 – Apr 2026 |
| Brushy Creek Gas Unit G-2-169363 | Key Energy Services, LLC only | Brushy Creek (Yegua 4850) | Lavaca | 1 | 247 | 72.5K | Jun 1998 – Apr 2007 |
| Hooker, Susan E. et Al G-6-76635 | Key Energy of Colorado, Inc. only | Paxton (Hill) | Panola | 1 | 245 | 77.3K | Jan 1993 – Oct 2000 |
| South Keystone/Ellen/Unit G-10-256551 | Basin Oil & Gas Operating, LLC only | Keystone (Ellenburger) | Winkler | 1 | 242 | 1.66M | Mar 2010 – Apr 2026 |
| Huddleston-Dickey O-9-11725 | Fisher, Jack Inc. only | GHG (Dogbend Limestone) | Runnels | 1 | 240 | 7.82K | Jan 1993 – Apr 1994 |
| Linn, Roy "C" G-14-157920 | BP America Production Company only | Ellis Ranch (Keys) | Ochiltree | 1 | 239 | 1.03M | Feb 1996 – Aug 2013 |
| Motley, Luke Unit G-6-103901 | Key Production Company, Inc. only | Carthage (Cotton Valley) | Panola | 1 | 238 | 12.7K | Jan 1993 – Feb 1994 |
| Jack Corgey O-2-9645 | Hankey Operating, Inc. only | Barvo (Yegua Sand) | Goliad | 1 | 238 | 33 | Mar 2011 – May 2011 |
| Key 31 O-10-44000 | Cholla Petroleum, Inc. only | Spraberry (Trend Area) | Borden | 1 | 236 | 0 | May 2013 – Dec 2013 |