| Foster, Mary O-10-2890 | Basa Resources, Inc. only | Iatan, East Howard | Mitchell | 495 | 12.8M | 2.65M | Jan 1993 – Apr 2026 |
| Mary Ellen O-10-38532 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 18 | 1.47M | 4.14M | Oct 2007 – Apr 2026 |
| Mary Ann O-10-23870 | Diamondback E&P LLC only | RK (Devonian) | Martin | 3 | 1.45M | 222 | Jan 1993 – Mar 2019 |
| Mary Krause Unit A O-2-10199 | Burlington Resources O & G Co LP only | Eagleville (Eagle Ford-2) | Live Oak | 4 | 1.26M | 4.46M | Sep 2012 – Apr 2026 |
| Paluxy "B" Sand Unit O-6-14110 | Culver & Cain Production LLC only | Mary Blevins (Paluxy B) | Smith | 8 | 1.15M | 0 | Oct 2001 – Apr 2026 |
| Foster, Mary Acct. #2 O-10-12160 | Basa Resources, Inc. only | Iatan (San Andres) | Mitchell | 74 | 989K | 142K | Jan 1993 – Apr 2026 |
| Gubbels, Mary Mrs. O-3-4112 | P.o.&g. Operating, LLC only | Thompson | Fort Bend | 17 | 960K | 830K | Jan 1993 – Jan 2024 |
| Mary 18 O-9-18593 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 8 | 935K | 4.89M | Nov 2013 – Apr 2026 |
| Mary Rose A O-9-20971 | Civitas Permian Operating, LLC only | Spraberry (Trend Area) | Reagan | 2 | 891K | 1.99M | Oct 2020 – Mar 2026 |
| Mary O-2-9668 | Magnolia Oil & Gas Operating LLC only | Eagleville (Eagle Ford-2) | Karnes | 4 | 747K | 2M | Dec 2010 – Apr 2026 |
| Mary 18-7-G O-9-19483 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 704K | 1.49M | Dec 2016 – Apr 2026 |
| Mary 18-7A-AZ O-9-19484 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 685K | 1.9M | Dec 2016 – Apr 2026 |
| Johnson, Mary B. O-1-15298 | Texian Operating Company, LLC only | Salt Flat (Edwards) | Caldwell | 7 | 679K | 0 | May 2010 – Mar 2026 |
| Mary Scharbauer B7 O-10-48961 | COG Operating LLC only | Parks (Consolidated) | Midland | 1 | 671K | 1.51M | May 2017 – Apr 2026 |
| Maryruth-Anderson 47C O-10-53059 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 665K | 810K | Nov 2019 – Apr 2026 |
| Mary O-9-15535 | COG Operating LLC only | Spraberry (Trend Area) | Upton | 8 | 661K | 2.1M | Jun 2004 – Apr 2026 |
| Mary Scharbauer B2 O-10-49024 | COG Operating LLC only | Parks (Consolidated) | Midland | 1 | 643K | 1.5M | May 2017 – Apr 2026 |
| Chalk, Mary O-10-19033 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 29 | 642K | 188K | Jan 1993 – Nov 2011 |
| Maryruth-Anderson 47F O-10-53183 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 641K | 475K | Nov 2019 – Apr 2026 |
| Maryruth-Bristow 47H O-10-56388 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 634K | 679K | Sep 2021 – Apr 2026 |
| Turner, Mary E. -D- O-10-22276 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Midland | 17 | 615K | 1.13M | Jan 1993 – Dec 2023 |
| Mary Scharbauer B4 O-10-49006 | COG Operating LLC only | Parks (Consolidated) | Midland | 1 | 603K | 1.44M | May 2017 – Apr 2026 |
| Maryruth-Anderson 47D O-10-53082 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 547K | 685K | Oct 2019 – Apr 2026 |
| Mary 18-7A-A O-9-19446 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 522K | 1.53M | Dec 2016 – Apr 2026 |
| Bean, Mary B. O-7-6067 | Basa Resources, Inc. only | East Texas | Rusk | 6 | 519K | 277K | Jan 1993 – Apr 2026 |
| Maryruth-Anderson 47E O-10-53149 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 514K | 684K | Oct 2019 – Apr 2026 |
| E. S. H. O-8-27132 | Clear Fork, Incorporated only | Maryneal (Strawn) | Nolan | 6 | 494K | 375K | Mar 1994 – Jun 2005 |
| Mary O-9-17637 | Summit Petroleum LLC only | Spraberry (Trend Area) | Upton | 9 | 488K | 3.12M | Sep 2011 – Jun 2025 |
| Maryruth-Bristow 47I O-10-56449 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 472K | 570K | Sep 2021 – Apr 2026 |
| Nielsen O-11-65457 | Whiting Oil and Gas Corporation only | Mary Two (Devonian) | Yoakum | 1 | 459K | 11.4K | Jan 1993 – Sep 2023 |
| Maryruth-Bristow 47J O-10-56326 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 440K | 555K | Sep 2021 – Apr 2026 |
| Mary Rose C O-9-20975 | Civitas Permian Operating, LLC only | Spraberry (Trend Area) | Reagan | 1 | 436K | 2.04M | Oct 2020 – Mar 2026 |
| Mary 18-7-H O-9-19445 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 436K | 1.02M | Dec 2016 – Apr 2026 |
| Maryland Trust O-4-13353 | Kaler Energy Corp. only | McCampbell (Deep Frio Cons.) | San Patricio | 5 | 404K | 319K | Oct 2004 – Mar 2026 |
| Maryruth-Bristow 47K O-10-56278 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 403K | 558K | Sep 2021 – Apr 2026 |
| Mary 18-7A-D O-9-20918 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 394K | 2.63M | Nov 2019 – Apr 2026 |
| Mary a Unit O-9-19209 | COG Operating LLC only | Spraberry (Trend Area) | Upton | 1 | 390K | 1.41M | Aug 2015 – Apr 2026 |
| Hubberd, Mary C. -A- O-4-1573 | Hilcorp Energy Company only | Loma Novia | Duval | 16 | 381K | 111 | Jan 1993 – Apr 2026 |
| Lawson, Mary O-7-8045 | Basa Resources, Inc. only | East Texas | Gregg | 24 | 372K | 259K | Jan 1993 – Apr 2026 |
| Mary 18D O-9-22060 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Upton | 1 | 370K | 597K | May 2023 – Apr 2026 |
| Mary Rose D O-9-20976 | Civitas Permian Operating, LLC only | Spraberry (Trend Area) | Reagan | 2 | 367K | 1.71M | Oct 2020 – Mar 2026 |
| Chalk,mary O-10-41221 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 37 | 366K | 130K | Dec 2011 – Apr 2026 |
| Mary Swain Harrell G-10-298627 | CPX Energy Operating, LLC only | Phantom (Wolfcamp) | Loving | 1 | 361K | 2.38M | Sep 2024 – Apr 2026 |
| Mary Rose B O-9-20974 | Civitas Permian Operating, LLC only | Spraberry (Trend Area) | Reagan | 2 | 358K | 1.39M | Oct 2020 – Mar 2026 |
| Mary Gary O-1-17429 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | Atascosa | 2 | 354K | 346K | Jan 2014 – May 2025 |
| Mary Grace 201-202 Unit G-10-289515 | Permian Resources Operating, LLC only | Phantom (Wolfcamp) | Ward | 1 | 353K | 3.11M | Jan 2020 – Apr 2026 |
| Mary 18-7A-C O-9-20916 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 343K | 1.05M | Nov 2019 – Apr 2026 |
| Mary Grace 201-202 Unit G-10-289534 | Permian Resources Operating, LLC only | Phantom (Wolfcamp) | Ward | 1 | 343K | 3.18M | Jan 2020 – Apr 2026 |
| Mary Scharbauer B6 O-10-48964 | COG Operating LLC only | Parks (Consolidated) | Midland | 1 | 339K | 1.75M | May 2017 – Apr 2026 |
| Mary Scharbauer B1 O-10-48992 | COG Operating LLC only | Parks (Consolidated) | Midland | 1 | 333K | 2M | May 2017 – Apr 2026 |