| Reed Bros. De O-10-19029 | Merit Energy Company only | Howard-Glasscock (Glorieta) | Howard | 14 | 627K | 46K | by Jan 1993 – Nov 2011 |
| Kloh -A- O-10-2813 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 21 | 609K | 8.17K | by Jan 1993 – Nov 2011 |
| Roberts, Dora O-10-2774 | Conocophillips Company only | Howard Glasscock | Howard | 55 | 607K | 2.33K | by Jan 1993 – Nov 2011 |
| Owen-Chalk O-10-41222 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 30 | 606K | 195K | Dec 2011 – Aug 2026 |
| Chalk, G. O. O-10-42240 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 40 | 576K | 286 | Dec 2011 – Aug 2026 |
| Chalk, G. O. -C- O-10-18989 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 13 | 560K | 29.4K | by Jan 1993 – Nov 2011 |
| Phillips O-10-2809 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Glasscock | 15 | 552K | 21 | by Jan 1993 – Nov 2011 |
| Denman -B- O-10-2874 | United Oil & Shale LLC only | Iatan, East Howard | Howard | 18 | 548K | 21 | by Jan 1993 – Jul 2026 |
| Eason, S. T. O-10-41235 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 16 | 545K | 17.8K | Dec 2011 – Aug 2026 |
| Clay, H. R. -E- O-10-2692 | Quantum Resources Management,llc only | Howard Glasscock | Howard | 48 | 526K | 4.73K | by Jan 1993 – Nov 2011 |
| Watson, W. W. O-10-8419 | R2Q Operating LLC only | Iatan, East Howard | Mitchell | 37 | 524K | 697 | by Jan 1993 – Aug 2026 |
| Jones -H- O-10-2884 | United Oil & Shale LLC only | Iatan, East Howard | Howard | 21 | 520K | 21 | by Jan 1993 – Apr 2026 |
| Texas Land&mortgage Co.-A-R/A-A- O-10-2916 | Basa Resources, Inc. only | Iatan, East Howard | Howard | 54 | 519K | 29K | by Jan 1993 – Aug 2026 |
| Howard Posner 83-TTT-B33 SA 204H O-10-51743 | Matador Production Company only | Phantom (Wolfcamp) | Loving | 1 | 518K | 2.19M | Feb 2019 – Aug 2026 |
| Howard Posner 83-TTT-B33 SA 203 O-10-51742 | Matador Production Company only | Phantom (Wolfcamp) | Loving | 1 | 517K | 2.09M | Feb 2019 – Aug 2026 |
| Texas Land & Mortgage Co. O-10-2863 | O'Ryan Oil and Gas only | Iatan, East Howard | Howard | 94 | 513K | 22 | by Jan 1993 – Jun 2024 |
| Chalk, G. O.-G- O-10-41220 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 38 | 509K | 143K | Dec 2011 – Aug 2026 |
| Dodge Estate O-10-2913 | Basa Resources, Inc. only | Iatan, East Howard | Howard | 35 | 505K | 80.2K | by Jan 1993 – Aug 2026 |
| Murray B O-10-2894 | Bce-Mach III LLC only | Iatan, East Howard | Howard | 12 | 505K | 17.1K | by Jan 1993 – Aug 2026 |
| Douthit, E. W., -De- O-10-19025 | Merit Energy Company only | Howard-Glasscock (Glorieta) | Howard | 18 | 504K | 49.4K | by Jan 1993 – Nov 2011 |
| Warder O-10-41063 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 29 | 499K | 69 | Dec 2011 – Aug 2026 |
| Chalk O-10-2805 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 33 | 491K | 37.8K | by Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-41051 | Unitex Oil & Gas, L.L.C. only | Howard Glasscock (Consolidated) | Howard | 42 | 489K | 26.6K | Dec 2011 – Aug 2026 |
| Kloh-Rumsey O-10-2817 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 19 | 482K | 187 | by Jan 1993 – Nov 2011 |
| Roberts, Dora O-10-46922 | Apache Corporation only | Howard Glasscock (Consolidated) | Howard | 61 | 467K | 0 | Dec 2011 – Aug 2026 |
| Woody-Howard 37H O-10-49838 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 446K | 1.65M | Dec 2017 – Aug 2026 |
| Chalk, G.O.-B- O-10-41211 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 13 | 442K | 91.5K | Dec 2011 – Aug 2026 |
| Jones, Percy O-10-2867 | Winn Operating, LLC only | Iatan, East Howard | Howard | 39 | 442K | 23.3K | by Jan 1993 – Aug 2026 |
| Woody-Howard 37J O-10-49488 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 442K | 1.15M | Dec 2017 – Aug 2026 |
| Woody-Howard 37I O-10-49581 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 437K | 1.23M | Dec 2017 – Aug 2026 |
| Settles, W. R. O-10-41272 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 47 | 431K | 0 | Dec 2011 – Aug 2026 |
| Reed, L.R. & W.N. O-10-34841 | Merit Energy Company only | Howard-Glasscock (Glorieta) | Howard | 8 | 426K | 26.8K | Dec 1995 – Nov 2011 |
| Woody-Howard 37G O-10-49841 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 425K | 1.14M | Dec 2017 – Aug 2026 |
| Chalk, G. O. -G- O-10-19031 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 20 | 423K | 80.2K | by Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-2792 | Tradition Resources Oper, LLC only | Howard Glasscock | Howard | 50 | 410K | 226K | by Jan 1993 – Nov 2011 |
| Douthit Unit O-10-11354 | Endeavor Energy Resources L.P. only | Howard Glasscock | Howard | 95 | 408K | 1.39K | by Jan 1993 – Nov 2011 |
| Woody-Howard 37K O-10-49506 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Martin | 1 | 403K | 968K | Dec 2017 – Aug 2026 |
| Douthit, E. W. -A- O-10-22380 | Cimarex Energy Co. of Colorado only | Howard Glasscock (Clear Fork,mi) | Howard | 4 | 392K | 2.71K | by Jan 1993 – Nov 2011 |
| Roberts, Dora O-10-19039 | Apache Corporation only | Howard-Glasscock (Glorieta) | Howard | 11 | 379K | 15.3K | by Jan 1993 – Nov 2011 |
| Murray C O-10-2893 | Bce-Mach III LLC only | Iatan, East Howard | Howard | 12 | 377K | 17.5K | by Jan 1993 – Aug 2026 |
| Chalk,mary O-10-41221 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 37 | 371K | 131K | Dec 2011 – Aug 2026 |
| Bellam O-10-2896 | New Height Energy, LLC only | Iatan, East Howard | Howard | 19 | 369K | 10.2K | by Jan 1993 – Jun 2026 |
| Chalk-B Duncan O-10-31901 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 2 | 366K | 10.7K | by Jan 1993 – Nov 2011 |
| Howard-Dennis O-13-4176 | Peba Oil & Gas, Inc. only | Montague County Regular | Montague | 33 | 366K | 93 | by Jan 1993 – Aug 2026 |
| Kloh -A- O-10-41281 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 15 | 344K | 35 | Dec 2011 – Aug 2026 |
| Echols, Cora Lee, Mrs., -B- O-10-2915 | Basa Resources, Inc. only | Iatan, East Howard | Howard | 32 | 343K | 234K | by Jan 1993 – Aug 2026 |
| Chalk, G.O.-E- O-10-41219 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 24 | 327K | 93.3K | Dec 2011 – Aug 2026 |
| Howard -A-B-E- O-13-4273 | V & H Oil, L.P. only | Montague County Regular | Montague | 30 | 320K | 21 | by Jan 1993 – Aug 2026 |
| Howard Glasscock East Unit O-10-35608 | Apache Corporation only | Howard-Glasscock (Glorieta) | Howard | 67 | 314K | 21.9K | Jan 1998 – Nov 2011 |
| T. L. & M. -B- O-10-2866 | New Height Energy, LLC only | Iatan, East Howard | Howard | 12 | 311K | 215 | by Jan 1993 – May 2026 |