| Mary Swain Harrell G-10-298627 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 394K | 2.62M | Sep 2024 – Aug 2026 |
| Mary Grace 201-202 Unit G-10-289515 | Permian Resources Operating, LLC only | Phantom (Wolfcamp) | Ward | 1 | 357K | 3.15M | Jan 2020 – Aug 2026 |
| Mary Grace 201-202 Unit G-10-289534 | Permian Resources Operating, LLC only | Phantom (Wolfcamp) | Ward | 1 | 346K | 3.21M | Jan 2020 – Aug 2026 |
| Mary Swain Harrell West G-10-299607 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 294K | 2.31M | Mar 2025 – Aug 2026 |
| Mary Swain Harrell G-10-298628 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 231K | 3.91M | Sep 2024 – Aug 2026 |
| Mary Lou Unit G-3-146707 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Fayette | 1 | 213K | 4.67M | Sep 1993 – Aug 2026 |
| Mary Swain Harrell G-10-298626 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 173K | 3.3M | Sep 2024 – Aug 2026 |
| Mary Swain Harrell West G-10-299651 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 159K | 3.2M | Mar 2025 – Aug 2026 |
| Mary Lou Unit G-3-289880 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Fayette | 1 | 138K | 1.39M | Sep 2019 – Aug 2026 |
| Mary Grace 201-202 Unit G-10-299915 | Permian Resources Operating, LLC only | Phantom (Wolfcamp) | Ward | 1 | 129K | 824K | Jun 2025 – Aug 2026 |
| Mary Scharbauer (Devonian) Unit G-10-172304 | XTO Energy Inc. only | Parks (Devonian) | Midland | 1 | 129K | 7.99M | Dec 1998 – Jun 2026 |
| Mary Grace 201-202 Unit G-10-299509 | Permian Resources Operating, LLC only | Phantom (Wolfcamp) | Ward | 1 | 128K | 880K | Jun 2025 – Aug 2026 |
| Mary Grace 201-202 Unit G-10-299508 | Permian Resources Operating, LLC only | Phantom (Wolfcamp) | Ward | 1 | 109K | 806K | Jun 2025 – Aug 2026 |
| Mary Swain Harrell West G-10-299609 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 102K | 2.93M | Mar 2025 – Aug 2026 |
| Mitchell, Mary 1 G-9-171685 | White Rock Oil & Gas, LLC only | Pakenham (Upper Strawn) | Terrell | 1 | 95.8K | 4.45M | Jan 1999 – Aug 2026 |
| Mary Snyder 157 G-14-278393 | BE Anadarko II, LLC only | Lipscomb, S.E. (Cleveland) | Lipscomb | 1 | 93.9K | 495K | Feb 2014 – Aug 2026 |
| Mitchell, Mary 1 G-9-167741 | White Rock Oil & Gas, LLC only | Pakenham (Upper Strawn) | Terrell | 1 | 92.3K | 3.49M | Mar 1998 – Aug 2026 |
| Maryle 60 G-14-290680 | Presidio Petroleum LLC only | Lipscomb, S.E. (Cleveland) | Lipscomb | 1 | 82.2K | 355K | Mar 2014 – Aug 2026 |
| Mary Snyder 157 G-14-278392 | BE Anadarko II, LLC only | Lipscomb, S.E. (Cleveland) | Lipscomb | 1 | 82.1K | 657K | Feb 2014 – Aug 2026 |
| Mary Swain Harrell G-10-299769 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 80.9K | 1.88M | Mar 2025 – Aug 2026 |
| Meoc-Mellon-State Unit G-2-295806 | T-C Oil Company, LLC only | Mary Ellen O'Connor (8300) | Refugio | 1 | 65.2K | 169K | May 2023 – Aug 2026 |
| Campbell, Mary G-3-198613 | TC Oil and Gas, LLC only | Hull South (Cook Mtn. 9700) | Liberty | 1 | 62.9K | 3.11M | Jan 2004 – Oct 2020 |
| Gatlin, Mary G-10-183142 | XTO Energy Inc. only | Parks (Devonian) | Midland | 1 | 61.6K | 2.46M | Jan 2001 – Aug 2026 |
| Mitchell, Mary 10 G-14-258634 | Mmgl Txph, LLC only | West Park (Granite Wash) | Wheeler | 1 | 60.8K | 4.08M | Jun 2010 – Aug 2026 |
| Mitchell, Mary 1 G-9-158997 | White Rock Oil & Gas, LLC only | Deer Canyon (Penn) | Terrell | 1 | 56.1K | 1.66M | Mar 1996 – Dec 1998 |
| Mary B. Golsch Gas Unit 1 G-2-109231 | Capital Star Oil & Gas, Inc. only | Hallettsville, East (9800) | Lavaca | 1 | 54.9K | 3.19M | by Jan 1993 – Aug 2026 |
| Mitchell, Mary 10 G-14-263263 | Mmgl Txph, LLC only | West Park (Granite Wash) | Wheeler | 1 | 53.9K | 2.86M | Feb 2011 – Aug 2026 |
| State Tract 37-A G-3-210780 | St. Mary Energy Company only | Turtle Beach (Vicksburg) | Chambers | 1 | 39.7K | 745K | Dec 2004 – Aug 2006 |
| Mitchell, Mary 10 G-14-272256 | Mmgl Txph, LLC only | West Park (Granite Wash) | Wheeler | 1 | 37.8K | 3.24M | Mar 2013 – Aug 2026 |
| Smith, Mary Carol Trust Unit G-1-119022 | Verdun Oil & Gas LLC only | Fashing (Edwards Lime -A-) | Atascosa | 1 | 35.7K | 2.98M | by Jan 1993 – Aug 2026 |
| Mitchell, Mary 10 G-14-270627 | Mmgl Txph, LLC only | West Park (Granite Wash) | Wheeler | 1 | 35.6K | 1.18M | Jul 2013 – Aug 2026 |
| Mary 118 G-14-272629 | Bracken Operating, L.L.C. only | Hemphill (Granite Wash.) | Hemphill | 1 | 34.3K | 1.2M | Apr 2013 – Aug 2026 |
| Mary B. Golsch Gas Unit G-2-113228 | Capital Star Oil & Gas, Inc. only | Hallettsville, East (9800) | Lavaca | 1 | 33K | 1.69M | by Jan 1993 – Aug 2026 |
| Corcoran, Mary Gas Unit G-3-268509 | Sundown Energy LP only | Sheridan, N. (Wilcox 8700) | Colorado | 1 | 32.4K | 747K | Jan 2012 – Nov 2015 |
| Lindsey, Mary G-13-147271 | Devon Energy Production Co, L.P. only | Kramberger (Atoka Congl.) | Jack | 1 | 26.1K | 722K | Jul 1993 – Nov 2015 |
| Korth, Mary G-2-151871 | Kenne Exploration, Inc. only | Yorktown (Scratchman) | De Witt | 1 | 24.7K | 414K | Sep 1994 – Oct 1998 |
| Meoc-Mellon-State Unit G-2-292773 | T-C Oil Company, LLC only | Mary Ellen OCONNOR(8100) | Refugio | 1 | 24.6K | 1.29M | Feb 2022 – Oct 2025 |
| Penley, Mary G-13-245198 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Denton | 1 | 22.7K | 1M | Oct 2008 – Aug 2026 |
| Price, Ruth Mary -B- G-10-48042 | Darkens Oil & Gas Inc. only | El Cinco (Leonard, Lower) | Pecos | 1 | 20.1K | 546K | by Jan 1993 – Aug 2026 |
| Price, Ruth Mary -C- G-10-186740 | Darkens Oil & Gas Inc. only | El Cinco (Leonard, Lower) | Pecos | 1 | 19.4K | 492K | Nov 2001 – Aug 2026 |
| Smith, Mary Carol Trust G-1-193 | Verdun Oil & Gas LLC only | Fashing (Edwards Lime -A-) | Atascosa | 1 | 17.9K | 1.94M | by Jan 1993 – Jan 2016 |
| Morrison, Mary T. -E- G-14-185520 | Bce-Mach III LLC only | Morrison Ranch (Morrow Up.) | Roberts | 1 | 16.6K | 3.99M | Jun 2001 – Jun 2010 |
| King, Mary Alice G-13-117774 | Great American Resources Inc. only | Jermyn, West (Caddo-MF) | Young | 1 | 16.2K | 1.18M | by Jan 1993 – Jul 2026 |
| Jones, Mary G-14-100146 | Mmgl Txph, LLC only | Hemphill (Douglas) | Hemphill | 1 | 15.4K | 1.58M | by Jan 1993 – Aug 2026 |
| Smith, Mary Carol Trust G-1-109470 | Verdun Oil & Gas LLC only | Fashing (Edwards Lime -A-) | Atascosa | 1 | 15.3K | 1.73M | by Jan 1993 – Jul 2026 |
| Mitchell, Mary 1 G-9-151757 | White Rock Oil & Gas, LLC only | Pakenham (Wolfcamp) | Terrell | 1 | 14.3K | 1.34M | Oct 1994 – Aug 2026 |
| Evans, Mary W. G-10-52807 | XTO Energy Inc. only | Beall (Ellen) | Ward | 1 | 14.2K | 1.41M | by Jan 1993 – Dec 2020 |
| Petty Ranch G-1-171498 | St. Mary Land & Exploration Co. only | Catarina, SW. (San Miguel-Gas) | Webb | 1 | 13.9K | 456K | Dec 1998 – May 2008 |
| Gatlin, Mary G-10-250315 | XTO Energy Inc. only | Parks (Devonian) | Midland | 1 | 13.2K | 506K | Oct 2007 – Apr 2020 |
| Mary A. Hinnant Heirs 'A' G-2-279049 | Royal Production Company, Inc. only | Lagarto Creek (Yegua) | Live Oak | 1 | 12.5K | 895K | Feb 2015 – May 2020 |