| Foster, Mary O-10-2890 | Basa Resources, Inc. only | Iatan, East Howard | Mitchell | 495 | 12.8M | 2.65M | Jan 1993 – Jul 2026 |
| Glasscock, Howard W. (G-S) Unit O-10-41062 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Glasscock | 242 | 5.93M | 43K | Dec 2011 – Jul 2026 |
| Roberts, Dora, B. D. & E. O-10-2827 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 194 | 5.33M | 16.9K | Jan 1993 – Aug 2012 |
| Dodge, Granville M., Est. O-10-2905 | Grayrock Energy II, LLC only | Iatan, East Howard | Howard | 262 | 5.2M | 438K | Jan 1993 – Jul 2026 |
| Glasscock, Howard W. (G-S) Unit O-10-22575 | Sheridan Production Company, LLC only | Howard Glasscock | Glasscock | 287 | 4.42M | 70.5K | Jan 1993 – Jun 2014 |
| Settles, W. R. -A- O-10-2704 | Conocophillips Company only | Howard Glasscock | Howard | 138 | 3.07M | 72.3K | Jan 1993 – May 2012 |
| Dodge, G. M. O-10-2909 | Bce-Mach III LLC only | Iatan, East Howard | Howard | 99 | 2.83M | 254K | Jan 1993 – Jul 2026 |
| Kloh O-10-2791 | Apache Corporation only | Howard Glasscock | Howard | 42 | 2.58M | 74.6K | Jan 1993 – Mar 2016 |
| Bell, A. M. O-10-2908 | Bce-Mach III LLC only | Iatan, East Howard | Howard | 66 | 1.95M | 127K | Jan 1993 – Jul 2026 |
| Foster, W. L. #1 O-10-2910 | Bce-Mach III LLC only | Iatan, East Howard | Mitchell | 99 | 1.94M | 144K | Jan 1993 – Jul 2026 |
| Howard, N. J. -Abc- O-13-4153 | Peba Oil & Gas, Inc. only | Montague County Regular | Montague | 175 | 1.89M | 105K | Jan 1993 – Jul 2026 |
| Kloh O-10-2748 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 88 | 1.84M | 751 | Jan 1993 – Mar 2013 |
| Roberts, Dora O-10-2803 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 67 | 1.82M | 14.8K | Jan 1993 – Jul 2012 |
| Settles, W. R. -A- O-10-41251 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 118 | 1.79M | 90.2K | Dec 2011 – Jul 2026 |
| Overton, B. O-10-2700 | Conocophillips Company only | Howard Glasscock | Howard | 41 | 1.57M | 29.8K | Jan 1993 – Apr 2013 |
| Settles,w.r. O-10-23286 | Endeavor Energy Resources L.P. only | Howard Glasscock | Howard | 69 | 1.54M | 70.2K | Jan 1993 – May 2012 |
| Settles, W. R. O-10-41250 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 76 | 1.53M | 84.5K | Dec 2011 – Jul 2026 |
| Howard Glasscock East Unit O-10-35609 | Apache Corporation only | Howard Glasscock | Howard | 131 | 1.45M | 97.3K | Jan 1998 – Mar 2016 |
| Dodge O-10-2883 | United Oil & Shale LLC only | Iatan, East Howard | Howard | 49 | 1.43M | 21 | Jan 1993 – Jul 2026 |
| Settles, W. R. O-10-2706 | Conocophillips Company only | Howard Glasscock | Howard | 62 | 1.35M | 59.2K | Jan 1993 – Aug 2012 |
| Roberts, Dora -Bde- O-10-41064 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 146 | 1.34M | 33.8K | Dec 2011 – Jul 2026 |
| Watson, W. W. O-10-2891 | Basa Resources, Inc. only | Iatan, East Howard | Mitchell | 75 | 1.3M | 148K | Jan 1993 – Jul 2026 |
| Roberts, Dora O-10-41282 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 53 | 1.3M | 19.8K | Dec 2011 – Jul 2026 |
| Kloh Etal O-10-41524 | Apache Corporation only | Howard Glasscock (Consolidated) | Howard | 84 | 1.23M | 68.6K | Dec 2011 – Jul 2026 |
| Kloh Etal O-10-2699 | Apache Corporation only | Howard Glasscock | Howard | 58 | 1.2M | 3.18K | Jan 1993 – Jul 2012 |
| Roberts, Dora O-10-41261 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 39 | 1.14M | 27.1K | Dec 2011 – Jul 2026 |
| Chalk, G. O. -D- O-10-41216 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 32 | 1.12M | 252K | Dec 2011 – Jul 2026 |
| Settles-Yates Unit O-10-20060 | Conocophillips Company only | Howard Glasscock | Howard | 84 | 1.08M | 34.3K | Jan 1993 – Apr 2012 |
| Kloh O-10-42224 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 80 | 997K | 0 | Dec 2011 – Jul 2026 |
| Foster, W. L. #5 O-10-2911 | Bce-Mach III LLC only | Iatan, East Howard | Mitchell | 29 | 992K | 165K | Jan 1993 – Jul 2026 |
| Settles, W. R. O-10-2825 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 24 | 971K | 9.18K | Jan 1993 – Aug 2012 |
| Hyman, Sarah O-10-41242 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 40 | 949K | 234K | Dec 2011 – Jul 2026 |
| Overton, B. O-10-41245 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 34 | 891K | 24.8K | Dec 2011 – Jul 2026 |
| Clay, H. R. O-10-2741 | Endeavor Energy Resources L.P. only | Howard Glasscock | Howard | 25 | 879K | 68.8K | Jan 1993 – Aug 2012 |
| Clay O-10-2750 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 37 | 865K | 415K | Jan 1993 – Mar 2013 |
| Chalk-Duncan O-10-2720 | Conocophillips Company only | Howard Glasscock | Howard | 16 | 858K | 165K | Jan 1993 – Apr 2012 |
| Tex. Land&mortgage Co.-A-R/A-B- O-10-2917 | Basa Resources, Inc. only | Iatan, East Howard | Howard | 56 | 805K | 75K | Jan 1993 – Jul 2026 |
| Chalk, Otis O-10-18996 | Apache Corporation only | Howard-Glasscock (Glorieta) | Howard | 20 | 798K | 261K | Jan 1993 – Oct 2015 |
| Eason, S. T. O-10-2696 | Conocophillips Company only | Howard Glasscock | Howard | 17 | 793K | 12K | Jan 1993 – Oct 2013 |
| Howard 33-22 O-10-38658 | Apache Corporation only | Phantom (Wolfcamp) | Ward | 3 | 772K | 1.09M | Sep 2007 – Jul 2026 |
| Chalk, Otis O-10-19011 | Tradition Resources LLC only | Howard-Glasscock (Glorieta) | Howard | 28 | 738K | 243K | Jan 1993 – Feb 2012 |
| Chalk, G. O. -C- O-10-41213 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 26 | 736K | 111K | Dec 2011 – Jul 2026 |
| Garrett, Horace Estate et al -A- O-10-32409 | Partee Drilling Inc. only | Howard-Glasscock (Wolfcamp 7400) | Howard | 12 | 717K | 2.39M | Jan 1993 – Jul 2026 |
| Echols, Cora Lee, Mrs., -A- O-10-2914 | Basa Resources, Inc. only | Iatan, East Howard | Howard | 37 | 709K | 247K | Jan 1993 – Jul 2026 |
| Warder O-10-2790 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 34 | 705K | 10.5K | Jan 1993 – Aug 2012 |
| E. H. Brown -A- O-10-26217 | Basa Resources, Inc. only | Iatan, East Howard | Mitchell | 45 | 700K | 69K | Jan 1993 – Jul 2026 |
| Davis, J. W. -B- O-10-2902 | Grayrock Energy II, LLC only | Iatan, East Howard | Howard | 17 | 691K | 24.9K | Jan 1993 – Jul 2026 |
| Chalk, Mary O-10-19033 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 29 | 642K | 188K | Jan 1993 – Apr 2012 |
| Roberts, Dora O-10-2821 | Apache Corporation only | Howard Glasscock | Howard | 59 | 638K | 39K | Jan 1993 – Mar 2016 |
| Howard Glasscock East Unit O-10-46924 | Apache Corporation only | Howard Glasscock (Consolidated) | Howard | 147 | 634K | 0 | Dec 2011 – Jul 2026 |