| Isaacs-Simpson G-14-99510 | Mountainside Energy Operating, L only | Canadian, SE (Douglas) | Hemphill | 1 | 6.01K | 2.56M | Jan 1993 – Mar 2026 |
| Halley, S. M. G-10-19806 | Chevron U. S. A. Inc. only | Emperor (Simpson) | Winkler | 1 | 5.76K | 933K | Jan 1993 – Jan 2006 |
| Simpson-Mann O-9-9811 | Armor Petroleum, Inc. only | Atkinson, W. (San Angelo) | Tom Green | 4 | 5.68K | 38 | Jan 1993 – Sep 2006 |
| Simpson L. M. T. "A" O-13-29693 | BKM Production only | Sherman (Ordovician 8,800) | Grayson | 1 | 5.53K | 21.3K | Oct 1999 – Apr 2026 |
| Gary O-9-16027 | Simpson Operating Services, LP only | Ballinger, West (Jennings) | Runnels | 1 | 5.52K | 32K | Aug 2006 – Apr 2007 |
| Harvey Renger Gas Unit G-2-269896 | Merit Energy Company only | Speaks, SW. (Simpson) | Lavaca | 1 | 5.5K | 740K | May 2013 – Nov 2025 |
| Harvey Renger Gas Unit G-2-274191 | Merit Energy Company only | Speaks, SW. (Simpson) | Lavaca | 1 | 5.46K | 866K | Apr 2014 – Apr 2026 |
| Daniel, M. K. "A" O-1-14200 | Tema Oil and Gas Company only | Simpson-Mann (Canyon) | Crockett | 2 | 5.45K | 436K | May 1998 – Oct 2010 |
| Hoelscher-Schwertner O-9-17307 | Simpson Operating Services, LP only | Ballinger, West (Morris SD) | Runnels | 1 | 5.28K | 8.77K | Aug 2010 – Mar 2026 |
| Simpson "E" G-6-145443 | Buffco Production Inc. only | New Barn (Cotton Valley Sand) | Cass | 1 | 5.03K | 2.04M | Feb 1993 – Apr 2026 |
| Simpson, B. O-13-23628 | Stamper Operating Co., Inc. only | Bryson, East | Jack | 3 | 4.93K | 134K | Jan 1993 – Jul 2018 |
| Stephens, J. B. O-8-8441 | Simpson Operating Services, LP only | Brown County Regular | Brown | 7 | 4.84K | 30 | Jan 1993 – Mar 2026 |
| Big State 10C O-9-8219 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 4.81K | 86 | Jan 1993 – Apr 2026 |
| Big State Ranch 10C O-9-9544 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 4.81K | 3.67K | Jan 1993 – Apr 2026 |
| Big State Ranch 10-7R O-9-12818 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 4.75K | 77 | Feb 1993 – Apr 2026 |
| Johnson 20 State O-10-39783 | Earnest Producing Corporation only | Clarey Connell (Simpson) Sand | Pecos | 2 | 4.6K | 0 | Mar 2009 – May 2017 |
| Hoover -E- O-9-1290 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 4.59K | 79 | Aug 1993 – Apr 2026 |
| Blaze "G" O-9-9180 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 4.47K | 83 | Feb 1993 – Jan 2026 |
| Simpson, B. O-13-23858 | Stamper Operating Co., Inc. only | Jack County Regular | Jack | 1 | 4.35K | 107K | Jan 1993 – Jul 2018 |
| Scull 5-E O-9-8238 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 4.22K | 84 | Jan 1993 – Feb 2021 |
| Simpson-Benton Unit O-3-14362 | Sage Energy Company only | Giddings (Austin Chalk-3) | Burleson | 1 | 4.18K | 40K | Jan 1993 – Feb 1996 |
| Ola Bowers Simpson "A" O-3-19340 | Srjc Enterprises, LLC only | Giddings (Austin Chalk-3) | Burleson | 1 | 4.14K | 7.51K | Sep 1993 – Oct 2008 |
| Cowan "C" O-8-14363 | Simpson Oil & Land Co. only | Coleman County Regular | Coleman | 1 | 4.13K | 50.6K | Jan 1993 – Mar 1998 |
| Halley, S. M. "B" O-10-37697 | Meco IV, LLC only | Emperor (Simpson) | Winkler | 1 | 3.89K | 169K | May 2005 – Jan 2014 |
| Simpson, Ida G-13-267101 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 3.86K | 671K | Jul 2012 – Mar 2023 |
| Simpson, J. P -A- O-13-17038 | Quest Petroleum Company only | Jack County Regular | Jack | 1 | 3.82K | 63 | Jan 1993 – Jun 2019 |
| Simpson Canyon 4045 Unit O-9-15785 | Surge Solutions, Inc. only | Bluegrass (Wolfcamp) | Crockett | 1 | 3.68K | 50 | Oct 2005 – Jul 2009 |
| Simpson -C- O-10-29194 | Unitex Oil & Gas, L.L.C. only | Westbrook, East (Clear Fork) | Mitchell | 1 | 3.59K | 19 | Jan 1993 – Jan 2001 |
| Simpson, Ida G-13-270175 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 3.52K | 352K | Mar 2013 – Oct 2018 |
| Four Way Ranch G-2-250487 | McGowan Working Partners, Inc. only | Lolita, Deep (Simpson 8500) | Jackson | 1 | 3.49K | 129K | Mar 2009 – Jan 2011 |
| Daniel, M. K. "A" G-1-168126 | Wolfcamp Energy, LLC only | Simpson-Mann (Canyon) | Crockett | 1 | 3.27K | 149K | Nov 1997 – Apr 2026 |
| Simpson, Hattie G-13-49680 | Perry Operating Inc. only | Jack County Regular (Gas) | Jack | 1 | 3.27K | 127K | Jan 1993 – Jun 2024 |
| Pure G-10-229182 | Permex Petroleum Corporation only | Emperor (Simpson) | Winkler | 1 | 3.18K | 722K | Jun 2007 – Nov 2025 |
| Simpson G-5-218660 | Old Union Operating Company only | Winkler, S.(cotton Valley Lime) | Freestone | 1 | 3.13K | 450K | Jun 2007 – Apr 2026 |
| Ricker State O-10-38275 | Thompson, J. Cleo only | Golden Corral (Simpson) | Reeves | 1 | 3.09K | 0 | Dec 2006 – Jun 2007 |
| SB & TG "03" O-9-10292 | Brody Oil & Gas Services, Inc. only | Simpson | Crockett | 1 | 3.09K | 82 | Jan 1993 – Apr 2026 |
| Freeman G-2-185236 | Fowler Oil & Gas LLC only | Speaks, SW. (Simpson) | Lavaca | 1 | 2.94K | 1.08M | Jul 2001 – Mar 2026 |
| Daniel, M. K. "112" G-1-171293 | Hilcorp Energy Company only | Simpson-Mann (Canyon) | Crockett | 1 | 2.93K | 736K | Oct 1998 – Apr 2026 |
| Simpson Heirs G-6-159887 | Buffco Production Inc. only | Glenwood (Cotton Valley) | Upshur | 1 | 2.89K | 245K | Aug 1996 – Sep 2007 |
| Simpson -A- O-10-25743 | Cowboys Resources Corp. only | Coleman Ranch, N. (Clear Fork) | Mitchell | 1 | 2.88K | 20 | Jan 1993 – Jun 2002 |
| Maxwell 14 G-10-197207 | Chevron U. S. A. Inc. only | Emperor (Simpson) | Winkler | 1 | 2.74K | 18.9K | May 2003 – Aug 2003 |
| Big State 11 O-9-8020 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 2.66K | 78 | Jun 1993 – Jan 2026 |
| Simpson, Ida G-13-267128 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 2.66K | 438K | Jul 2012 – Sep 2022 |
| Simpson, W. M. G-3-196818 | Sue-Ann Operating, L.C. only | Pheasant (Simpson) | Matagorda | 1 | 2.61K | 455K | Aug 2003 – Apr 2006 |
| Simpson-Benton Unit O-3-25298 | Sheridan Production Company, LLC only | Caldwell (Georgetown) | Burleson | 1 | 2.59K | 8.11K | Aug 2008 – Jun 2017 |
| Simpson O-13-30549 | JDL Operating, LLC only | Jack County Regular | Jack | 1 | 2.5K | 0 | Jan 2006 – Mar 2021 |
| Scull 7 O-9-8360 | Hoover Petroleum Company, LLC only | Simpson | Crockett | 1 | 2.45K | 57 | Nov 1993 – Apr 2026 |
| Lee, R. O-8-23607 | Simpson Oil & Land Co. only | Coleman County Regular | Coleman | 1 | 2.45K | 21 | Jan 1993 – Aug 1996 |
| Order of the Eastern Star O-11-61855 | Simpson Oil Company only | Sundown (Wolfcamp) | Yoakum | 1 | 2.43K | 21 | Jan 1993 – Nov 1995 |
| Anderson O-8-30051 | Simpson Energy, Inc. only | Heather (Noodle Creek) | Fisher | 1 | 2.36K | 30 | Jan 2008 – Dec 2010 |