| Dietz, W. H.-Hazel O-9-9815 | Simpson Oil & Land Co. only | Vanderlaan-Freedman (Gardner) | Runnels | 2 | 460 | 10.4K | Jan 1993 – Mar 1997 |
| Meadows-State 10 G-1-161273 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Val Verde | 1 | 457 | 845K | Jan 1997 – Mar 2026 |
| Simpson O-11-62915 | Cwoc only | Sharon Ridge (Clear Fork) | Mitchell | 2 | 433 | 35 | Jan 1993 – Mar 1996 |
| Simpson, Ola Bowers O-3-13928 | Ginger Petroleum Company, Inc. only | Giddings (Austin Chalk-3) | Burleson | 1 | 419 | 339 | Jan 1993 – Jul 1995 |
| Freeman G-2-181727 | Fowler Oil & Gas LLC only | Speaks, SW. (Simpson) | Lavaca | 1 | 417 | 4.34M | Dec 2000 – Mar 2026 |
| Jackson O-13-25793 | Simpson Oil & Land Co. only | Tally (Congl.) | Clay | 1 | 414 | 92.9K | Jan 1993 – Oct 1997 |
| Lehde-Simpson Unit O-3-13906 | Browning, Landon only | Giddings (Austin Chalk-3) | Burleson | 1 | 405 | 1.59K | Jan 1993 – Oct 1994 |
| Daniel, M. K. "A" G-1-173133 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 404 | 209K | May 1999 – Apr 2026 |
| Daniel, M. K. 111 "A" G-1-171456 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 398 | 428K | Nov 1998 – Apr 2026 |
| Meadows-State 12 G-1-162577 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Val Verde | 1 | 382 | 123K | Jun 1998 – Dec 2025 |
| Hoelscher/Schwertner 2A O-9-18371 | Simpson Operating Services, LP only | Ballinger, West (Palo Pinto) | Runnels | 1 | 375 | 0 | Oct 2013 – Mar 2026 |
| Barker-Simpson G-13-249256 | Formentera Operations LLC only | Newark, East (Barnett Shale) | Johnson | 1 | 374 | 346K | Jan 2008 – Sep 2020 |
| Simpson, W. M. G-13-281683 | BKV Barnett, LLC only | Boonsville (Consolidated Congl.) | Wise | 1 | 360 | 8.48K | Nov 2016 – Mar 2018 |
| Daniel, M. K. 111 "A" G-1-179961 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 355 | 186K | Sep 2000 – Apr 2026 |
| Simpson O-8-32738 | Interstate Explorations LLC only | JO Kiel (Caddo) | Eastland | 1 | 354 | 0 | Dec 2023 – Jun 2024 |
| Daniel, M. K. G-1-183015 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 347 | 820K | May 2001 – Apr 2026 |
| Simpson Canyon 103 Unit O-9-17012 | MLC Operating, LP only | Wildcat | Crockett | 1 | 331 | 0 | Feb 2009 – Feb 2009 |
| Daniel, M. K. "113" G-1-169721 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 328 | 798K | Jun 1998 – Apr 2026 |
| Daniel, M. K. G-1-159573 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 327 | 853K | Aug 1996 – Oct 2025 |
| Daniel, M. K. G-1-157579 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Val Verde | 1 | 322 | 497K | Jan 1996 – Apr 2026 |
| Simpson, O. M. O-10-31175 | Coastal Oil & Gas Corporation only | Spraberry (Trend Area) | Midland | 1 | 321 | 747 | Jan 1993 – Jun 1993 |
| Daniel, M. K. G-1-160868 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 309 | 778K | Nov 1996 – Feb 2026 |
| Anderson O-13-1733 | Ginnings Company only | Henrietta, E. (Simpson Lime) | Clay | 1 | 308 | 21.2K | Jan 1993 – Apr 1996 |
| Daniel, M. K. G-1-160866 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 308 | 813K | Nov 1996 – Feb 2026 |
| Freeman G-2-228183 | Remora Management, LLC only | Speaks, SW. (Simpson) | Lavaca | 1 | 305 | 4.63M | May 2007 – Jul 2022 |
| Daniel, M. K. G-1-182815 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Val Verde | 1 | 296 | 256K | May 2001 – Oct 2025 |
| Daniel-State 2 G-1-160491 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 286 | 523K | Oct 1996 – Sep 2018 |
| Big State 3-9 O-9-10760 | Thompson, J. Cleo only | Simpson | Crockett | 1 | 286 | 15 | Jan 1993 – Mar 1994 |
| Owens O-9-10814 | Thompson, J. Cleo only | Simpson | Crockett | 1 | 285 | 15 | Jan 1993 – Mar 1994 |
| Daniel, M. K. G-1-185993 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 284 | 743K | Sep 2001 – Apr 2026 |
| Simpson, W. M. G-13-122282 | Devon Energy Production Co, L.P. only | Boonsville (Bend Congl., Gas) | Wise | 1 | 283 | 539K | Jan 1993 – Oct 2011 |
| Simpson, W. M. O-13-33569 | Devon Energy Production Co, L.P. only | Boonsville (Consolidated Congl.) | Wise | 1 | 265 | 1.74K | Aug 2016 – Oct 2016 |
| Daniel-State 2 G-1-160853 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Val Verde | 1 | 265 | 473K | Nov 1996 – Mar 2026 |
| Simpson, Hattie O-13-34350 | Perry Operating Inc. only | Jack County Regular (Gas) | Jack | 1 | 264 | 0 | Jul 2024 – Apr 2026 |
| Daniel, M. K. "113" G-1-171458 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 263 | 651K | Nov 1998 – Apr 2026 |
| Daniel, M. K. 112 "A" G-1-171474 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 262 | 193K | Dec 1998 – Apr 2026 |
| Daniel, M. K. 112 "A" G-1-171472 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 253 | 818K | Oct 1998 – Apr 2026 |
| Daniel, M. K. G-1-160753 | Tema Oil and Gas Company only | Simpson-Mann (Canyon) | Crockett | 1 | 251 | 445K | Nov 1996 – Nov 2016 |
| Daniel, M. K. "113" G-1-175780 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 249 | 495K | Jan 2000 – Apr 2026 |
| Daniel, M. K. G-1-159570 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 247 | 539K | Aug 1996 – Dec 2025 |
| Daniel - State 2 G-1-161126 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 245 | 385K | Dec 1996 – Apr 2018 |
| Simpson Estate O-5-3545 | Palmer Petroleum Inc. only | Upper Keechi Creek (Dexter Sd.) | Leon | 1 | 241 | 0 | Jan 1997 – Feb 1997 |
| Daniel, M. K. 110 G-1-185014 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 233 | 1.04M | Aug 2001 – Apr 2026 |
| Daniel, M. K. "113" G-1-179954 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 233 | 484K | Sep 2000 – Apr 2026 |
| Meadows-State 10 G-1-161274 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Val Verde | 1 | 226 | 404K | Jan 1997 – Apr 2026 |
| Simpson-Ward O-11-63133 | Barj Oil Co. only | Seven Lakes (Fusselman) | Terry | 1 | 226 | 20 | Jan 1993 – Jan 2018 |
| Daniel-State 2 G-1-161128 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 224 | 539K | Dec 1996 – Apr 2026 |
| M. K. Daniel Iiia G-1-181363 | Occidental Permian EOR, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 209 | 263K | Feb 2001 – Apr 2026 |
| Simpson "H" O-9-10521 | Tomahawk Petroleum only | Meadow Creek (Canyon) | Coke | 1 | 199 | 305 | Jan 1993 – Jan 1994 |
| Daniel, M. K. "113" G-1-177892 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 197 | 360K | May 2000 – Apr 2026 |