| Glasscock, Howard W. (G-S) Unit O-10-41062 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Glasscock | 242 | 5.93M | 43K | Dec 2011 – Apr 2026 |
| Roberts, Dora, B. D. & E. O-10-2827 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 194 | 5.33M | 16.9K | Jan 1993 – Nov 2011 |
| Glasscock, Howard W. (G-S) Unit O-10-22575 | Sheridan Production Company, LLC only | Howard Glasscock | Glasscock | 287 | 4.42M | 70.5K | Jan 1993 – Nov 2011 |
| Settles, W. R. -A- O-10-2704 | Conocophillips Company only | Howard Glasscock | Howard | 138 | 3.07M | 72.3K | Jan 1993 – Nov 2011 |
| Kloh O-10-2791 | Apache Corporation only | Howard Glasscock | Howard | 42 | 2.58M | 74.6K | Jan 1993 – Nov 2011 |
| Kloh O-10-2748 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 88 | 1.84M | 751 | Jan 1993 – Nov 2011 |
| Roberts, Dora O-10-2803 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 67 | 1.82M | 14.8K | Jan 1993 – Nov 2011 |
| Settles, W. R. -A- O-10-41251 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 118 | 1.79M | 90.2K | Dec 2011 – Apr 2026 |
| Overton, B. O-10-2700 | Conocophillips Company only | Howard Glasscock | Howard | 41 | 1.57M | 29.8K | Jan 1993 – Nov 2011 |
| Settles,w.r. O-10-23286 | Endeavor Energy Resources L.P. only | Howard Glasscock | Howard | 69 | 1.54M | 70.2K | Jan 1993 – Nov 2011 |
| Settles, W. R. O-10-41250 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 76 | 1.53M | 84.5K | Dec 2011 – Apr 2026 |
| Classic Unit O-10-52373 | Apache Corporation only | Spraberry (Trend Area) | Howard | 5 | 1.51M | 3.27M | Mar 2019 – Apr 2026 |
| Howard Glasscock East Unit O-10-35609 | Apache Corporation only | Howard Glasscock | Howard | 131 | 1.45M | 97.3K | Jan 1998 – Nov 2011 |
| Settles, W. R. O-10-2706 | Conocophillips Company only | Howard Glasscock | Howard | 62 | 1.35M | 59.2K | Jan 1993 – Nov 2011 |
| Roberts, Dora -Bde- O-10-41064 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 146 | 1.34M | 33.8K | Dec 2011 – Apr 2026 |
| Roberts, Dora O-10-41282 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 53 | 1.3M | 19.8K | Dec 2011 – Apr 2026 |
| Kloh Etal O-10-41524 | Apache Corporation only | Howard Glasscock (Consolidated) | Howard | 84 | 1.23M | 68.6K | Dec 2011 – Apr 2026 |
| Kloh Etal O-10-2699 | Apache Corporation only | Howard Glasscock | Howard | 58 | 1.2M | 3.18K | Jan 1993 – Nov 2011 |
| Roberts, Dora O-10-41261 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 39 | 1.14M | 27.1K | Dec 2011 – Apr 2026 |
| Chalk, G. O. -D- O-10-41216 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 32 | 1.12M | 252K | Dec 2011 – Apr 2026 |
| Settles-Yates Unit O-10-20060 | Conocophillips Company only | Howard Glasscock | Howard | 84 | 1.08M | 34.3K | Jan 1993 – Nov 2011 |
| Kloh O-10-42224 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 80 | 997K | 0 | Dec 2011 – Apr 2026 |
| Settles, W. R. O-10-2825 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 24 | 971K | 9.18K | Jan 1993 – Nov 2011 |
| Hyman, Sarah O-10-41242 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 40 | 949K | 234K | Dec 2011 – Apr 2026 |
| Overton, B. O-10-41245 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 34 | 891K | 24.8K | Dec 2011 – Apr 2026 |
| Clay, H. R. O-10-2741 | Endeavor Energy Resources L.P. only | Howard Glasscock | Howard | 25 | 879K | 68.8K | Jan 1993 – Nov 2011 |
| Clay O-10-2750 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 37 | 865K | 415K | Jan 1993 – Nov 2011 |
| Chalk-Duncan O-10-2720 | Conocophillips Company only | Howard Glasscock | Howard | 16 | 858K | 165K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-18996 | Apache Corporation only | Howard-Glasscock (Glorieta) | Howard | 20 | 798K | 261K | Jan 1993 – Nov 2011 |
| Eason, S. T. O-10-2696 | Conocophillips Company only | Howard Glasscock | Howard | 17 | 793K | 12K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-19011 | Tradition Resources LLC only | Howard-Glasscock (Glorieta) | Howard | 28 | 738K | 243K | Jan 1993 – Nov 2011 |
| Chalk, G. O. -C- O-10-41213 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 26 | 736K | 111K | Dec 2011 – Apr 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 – Feb 2026 |
| Warder O-10-2790 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 34 | 705K | 10.5K | Jan 1993 – Nov 2011 |
| Chalk, Mary O-10-19033 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 29 | 642K | 188K | Jan 1993 – Nov 2011 |
| Roberts, Dora O-10-2821 | Apache Corporation only | Howard Glasscock | Howard | 59 | 638K | 39K | Jan 1993 – Nov 2011 |
| Howard Glasscock East Unit O-10-46924 | Apache Corporation only | Howard Glasscock (Consolidated) | Howard | 147 | 634K | 0 | Dec 2011 – Apr 2026 |
| Reed Bros. De O-10-19029 | Merit Energy Company only | Howard-Glasscock (Glorieta) | Howard | 14 | 627K | 46K | Jan 1993 – Nov 2011 |
| Kloh -A- O-10-2813 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 21 | 609K | 8.17K | Jan 1993 – Nov 2011 |
| Roberts, Dora O-10-2774 | Conocophillips Company only | Howard Glasscock | Howard | 55 | 607K | 2.33K | Jan 1993 – Nov 2011 |
| Owen-Chalk O-10-41222 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 30 | 600K | 191K | Dec 2011 – Apr 2026 |
| Chalk, G. O. O-10-42240 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 40 | 563K | 286 | Dec 2011 – Apr 2026 |
| Chalk, G. O. -C- O-10-18989 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 13 | 560K | 29.4K | Jan 1993 – Nov 2011 |
| Eason, S. T. O-10-41235 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 16 | 533K | 17.7K | Dec 2011 – Apr 2026 |
| Clay, H. R. -E- O-10-2692 | Quantum Resources Management,llc only | Howard Glasscock | Howard | 48 | 526K | 4.73K | Jan 1993 – Nov 2011 |
| Douthit, E. W., -De- O-10-19025 | Merit Energy Company only | Howard-Glasscock (Glorieta) | Howard | 18 | 504K | 49.4K | Jan 1993 – Nov 2011 |
| Chalk, G. O.-G- O-10-41220 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 38 | 496K | 140K | Dec 2011 – Apr 2026 |
| Warder O-10-41063 | Basa Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 29 | 492K | 69 | Dec 2011 – Apr 2026 |
| Chalk O-10-2805 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 33 | 491K | 37.8K | Jan 1993 – Nov 2011 |
| Kloh-Rumsey O-10-2817 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 19 | 482K | 187 | Jan 1993 – Nov 2011 |