| Mays Trust "B" O-11-66354 | Sweet Crude Operating LLC only | Clairemont, SW. (Mays) | Kent | 4 | 273K | 37.7K | by Jan 1993 – Aug 2026 |
| Mays O-10-37910 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 4 | 228K | 671K | Nov 2006 – Dec 2025 |
| Mayse 3068 O-9-16510 | Ganador Operating, LLC only | Lonesome Reef (Wolfcamp) | Irion | 7 | 163K | 496K | Feb 2008 – Mar 2021 |
| Mayse 3068 O-9-17826 | Triple Crown Resources, LLC only | Spraberry (Trend Area) | Irion | 12 | 155K | 666K | Feb 2012 – Jul 2026 |
| Clairemont South 17-2 O-11-69810 | Sharp Image Energy, Inc. only | Clairemont, SW. (Mays) | Kent | 1 | 67.1K | 0 | Dec 2011 – Aug 2026 |
| Mays Trust O-11-66267 | Sweet Crude Operating LLC only | Clairemont, SW. (Mays) | Kent | 1 | 64.7K | 41.8K | by Jan 1993 – Aug 2026 |
| Mays, Gene (SEC.17) O-10-29706 | Southwest Royalties, Inc. only | Hokit (Penn, Upper) | Pecos | 3 | 58.3K | 614K | by Jan 1993 – Apr 2012 |
| Mayse "A" O-9-11631 | Toc Energy Resources, LLC only | Sixty Seven (Clear Fork 3100) | Irion | 2 | 54.1K | 115K | by Jan 1993 – Aug 2026 |
| Clairemont South 17 O-11-69747 | Sharp Image Energy, Inc. only | Clairemont, SW. (Mays) | Kent | 1 | 52.6K | 0 | Jul 2011 – May 2020 |
| Spears-Mays O-6-12243 | Winchester Production Co., Ltd. only | Waskom (Sanders Sand) | Harrison | 1 | 40.9K | 112K | by Jan 1993 – Feb 2005 |
| Mays Trust 81 O-14-8851 | BE Anadarko II, LLC only | Lipscomb, S.E. (Cleveland) | Hemphill | 1 | 39.9K | 1.24M | Feb 2012 – Aug 2026 |
| Mayse O-10-44105 | Devon Energy Production Co, L.P. only | Garden City, S. (Wolfcamp) | Mitchell | 1 | 37K | 49.2K | Nov 2012 – Jul 2015 |
| Mayse O-9-11093 | Toc Energy Resources, LLC only | Sixty Seven (Clear Fork 3100) | Irion | 2 | 30.4K | 47.3K | by Jan 1993 – Aug 2026 |
| Mayse 26 O-9-18308 | Triple Crown Resources, LLC only | Spraberry (Trend Area) | Irion | 3 | 26.5K | 66.9K | Jul 2013 – Jul 2026 |
| Gene Mays-State Sec. 20 O-10-29704 | Southwest Royalties, Inc. only | Hokit (Penn, Upper) | Pecos | 2 | 22.9K | 441K | by Jan 1993 – Mar 2012 |
| Spears-Mays G-6-209678 | Hopewell Operating, Inc. only | Waskom (Sanders Sand) | Harrison | 1 | 20.3K | 77.3K | Mar 2005 – Dec 2013 |
| Mays O-9-5831 | WTG Exploration only | Tippett (Leonard, Lower) | Crockett | 1 | 19.9K | 192K | by Jan 1993 – Aug 2026 |
| Mayse 'B' O-9-11750 | Toc Energy Resources, LLC only | Christi (Canyon 6800) | Irion | 1 | 10.6K | 96.9K | by Jan 1993 – Aug 2026 |
| Spears-Mays O-6-15297 | JHS Oilfield Services LLC only | Waskom (Sanders Sand) | Harrison | 1 | 9.69K | 9 | Jan 2014 – Aug 2026 |
| Mayse 26 O-9-17824 | Ganador Operating, LLC only | Lonesome Reef (Wolfcamp) | Irion | 1 | 6.96K | 11.9K | Jan 2012 – Mar 2021 |
| Mays, Gene-State Sec. 18 Ltr. SE O-10-29707 | Southwest Royalties, Inc. only | Hokit (Penn, Upper) | Pecos | 1 | 6.26K | 12.9K | by Jan 1993 – Mar 1996 |
| Mayse "A" O-9-11111 | Ozark Exploration, Inc. only | Christi (Canyon 6800) | Irion | 2 | 4.85K | 46.3K | by Jan 1993 – Mar 2009 |
| Mayse O-9-10625 | Chesapeake Operating, Inc. only | Andrew A. (Canyon) | Irion | 1 | 4.06K | 5.32K | by Jan 1993 – Nov 1997 |
| Mays, G. C. 'A' O-6-13332 | Basa Resources, Inc. only | Days Chapel (Carrizo) | Anderson | 1 | 3.53K | 54 | Feb 1993 – Sep 2008 |
| Mays "36" O-11-65197 | Coyote Oil, Inc. only | Elzon (Reef) | Kent | 1 | 2.99K | 20 | by Jan 1993 – Jul 1995 |
| Mays G-10-145971 | Southwest Royalties, Inc. only | Hokit (Ellen.) | Pecos | 1 | 2.86K | 193K | Jun 1993 – Mar 1997 |
| Mays, Gene (Sec. 17) O-10-40276 | Southwest Royalties, Inc. only | Hokit (Leonard) | Pecos | 1 | 2.85K | 8.61K | Jan 2010 – Jan 2011 |
| Dhi Mays 127-7 O-10-49887 | Cambrian Management, Ltd. only | Wolfbone (Trend Area) | Pecos | 1 | 1.53K | 0 | Oct 2017 – Aug 2019 |
| Mayse "26" O-9-15069 | Pioneer Natural Res. USA, Inc. only | MY Way (Wolfcamp) | Irion | 1 | 1.18K | 6.73K | Oct 2000 – Feb 2004 |
| Mays Estate O-10-36816 | Latigo Petroleum Texas, LP only | Barstow (Bone Spring) | Reeves | 1 | 598 | 12.2K | Nov 2000 – May 2002 |
| Mayse "C" O-9-12443 | Ozark Exploration, Inc. only | Sixty Seven (Clear Fork 3100) | Irion | 1 | 421 | 21 | by Jan 1993 – Jan 1999 |
| Mays O-1-18644 | Texstar Oil & Gas, LLC only | La Vernia (Austin Chalk) | Wilson | 1 | 409 | 0 | Apr 2016 – May 2020 |
| Mayse O-9-14715 | Nadel and Gussman Permian,l.l.c. only | Andrew a (Wolfcamp) | Irion | 1 | 66 | 0 | Jan 1998 – Oct 1999 |
| Mays, A.P. O-5-3404 | Basin Industries, Inc. only | Corsicana (Shallow) | Navarro | 1 | 5 | 5 | Feb 1993 – Jul 1993 |
| Mays-McElroy G-13-253649 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Hill | 1 | 0 | 1.08M | Feb 2009 – Aug 2026 |
| Meekins-Mays G-13-210618 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Tarrant | 1 | 0 | 375K | May 2005 – Jan 2009 |
| Meekins-Mays G-13-206713 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Tarrant | 1 | 0 | 1.03M | Jan 2005 – Aug 2026 |
| Mays, M. L., Mrs., Etal O-3-4500 | Indian River Exploration Co. only | West Columbia New | Brazoria | 4 | 0 | 0 | — |
| Mays O-10-29447 | Environmental Dspl Systems, LLC only | Spraberry (Trend Area) | Martin | 1 | 0 | 0 | — |
| Mays, Elna O-9-16182 | Lavanco Energy, Ltd. only | Wildcat | Coke | 1 | 0 | 0 | — |
| Mays, G. C. O-6-5556 | Dg&e/Slocum, Limited Partnership only | Slocum, NW (Wright) | Anderson | 1 | 0 | 0 | — |
| Dallmeyer-Maysel Unit O-3-22298 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Washington | 1 | 0 | 0 | — |
| Mays Trust 81 G-14-267529 | Le Norman Operating LLC only | Lipscomb, S.E. (Cleveland) | Hemphill | 1 | 0 | 0 | — |
| Meekins-Mays G-13-200889 | Devon Energy Production Co, L.P. only | Newark, East (Barnett Shale) | Tarrant | 1 | 0 | 261K | Apr 2004 – Apr 2010 |
| Meekins-Mays G-13-198635 | Devon Energy Production Co, L.P. only | Newark, East (Barnett Shale) | Tarrant | 1 | 0 | 61.9K | Dec 2003 – Dec 2006 |
| Mays 40 G-10-220332 | Samson Lone Star, LLC only | Marsh, S. (Delaware) | Culberson | 1 | 0 | 208 | Aug 2006 – Aug 2006 |
| Mays, Gene State 18 G-10-158324 | Southwest Royalties, Inc. only | Hokit (Queen) | Pecos | 1 | 0 | 5.2K | May 1996 – Dec 1996 |
| Mays, Mitzi G-8-186676 | Kollao Properties LLC only | Coleman County Regular (Gas) | Coleman | 1 | 0 | 11.5K | Jan 2002 – May 2006 |
| Whitis G-8-105191 | Mays Enterprises, Inc. only | Mineral Wells (Strawn, Lower) | Palo Pinto | 1 | 0 | 216K | by Jan 1993 – Dec 2007 |
| South Mays Unit 6 G-3-166845 | Magnum Producing, LP only | Wildcat | Chambers | 1 | 0 | 0 | — |