| Clay, H. R. O-10-2741 | Endeavor Energy Resources L.P. only | Howard Glasscock | Howard | 25 | 879K | 68.8K | by Jan 1993 – Nov 2011 |
| Clay O-10-2750 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 37 | 865K | 415K | by Jan 1993 – Nov 2011 |
| Barclays B Unit O-10-50687 | Apache Corporation only | Spraberry (Trend Area) | Howard | 2 | 600K | 1.22M | Jun 2018 – Aug 2026 |
| Barclays Unit O-10-49389 | Apache Corporation only | Spraberry (Trend Area) | Howard | 2 | 535K | 1.08M | Aug 2017 – 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 |
| Players A2 O-10-49398 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 366K | 655K | Sep 2017 – Aug 2026 |
| Players A1 O-10-49397 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 364K | 619K | Sep 2017 – Aug 2026 |
| Players A3 O-10-50570 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 343K | 601K | Jun 2018 – Aug 2026 |
| Players A4 O-10-50588 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 308K | 620K | Jun 2018 – Aug 2026 |
| Players A5 O-10-50589 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 306K | 592K | Jun 2018 – Aug 2026 |
| Clay, H. R. -E- O-10-18993 | Quantum Resources Management,llc only | Howard-Glasscock (Glorieta) | Howard | 24 | 267K | 2.36K | by Jan 1993 – Nov 2011 |
| Players A7 O-10-56347 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 243K | 564K | Jul 2021 – Aug 2026 |
| Clay O-10-42235 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 29 | 234K | 24.9K | Dec 2011 – Aug 2026 |
| Players A8 O-10-56345 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 222K | 685K | Jul 2021 – Aug 2026 |
| Clay, H. R. -A- O-10-2691 | Quantum Resources Management,llc only | Howard Glasscock | Howard | 42 | 205K | 12.3K | by Jan 1993 – Nov 2011 |
| Clay, H. R. -C- O-10-2823 | Breitburn Operating L.P. only | Howard Glasscock | Howard | 10 | 191K | 6.97K | by Jan 1993 – Nov 2011 |
| Clay, H. R. O-10-2738 | Wash, Robert C. Inc. only | Howard Glasscock | Glasscock | 27 | 186K | 45 | by Jan 1993 – Nov 2011 |
| Players A6 O-10-56346 | Apache Corporation only | Spraberry (Trend Area) | Howard | 1 | 145K | 389K | Oct 2021 – Aug 2026 |
| Clay, H. R. -A- O-10-18992 | Quantum Resources Management,llc only | Howard-Glasscock (Glorieta) | Howard | 11 | 143K | 5.33K | by Jan 1993 – Nov 2011 |
| Clay, H. R. -B- Amoco O-10-2822 | Quantum Resources Management,llc only | Howard Glasscock | Howard | 10 | 137K | 3.84K | by Jan 1993 – Nov 2011 |
| Clay, H. R. O-10-41676 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 36 | 136K | 0 | Dec 2011 – Aug 2026 |
| Clay, H. R. -A- O-10-8680 | Wash, Robert C. Inc. only | Howard Glasscock | Howard | 21 | 135K | 118 | by Jan 1993 – Nov 2011 |
| Clay, H. R. -A- O-10-2744 | Robertson Resources, Inc. only | Howard Glasscock | Howard | 6 | 127K | 55.9K | by Jan 1993 – Oct 2014 |
| Clay, H. R.-E- O-10-41290 | Landmark IP, LLC only | Howard Glasscock (Consolidated) | Howard | 59 | 116K | 0 | Dec 2011 – May 2026 |
| Clay, H. R. O-10-47933 | Wash, Robert C. Inc. only | Howard Glasscock (Consolidated) | Glasscock | 20 | 112K | 121 | Dec 2011 – Jul 2026 |
| Clay, H. R.-A- O-10-41289 | Landmark IP, LLC only | Howard Glasscock (Consolidated) | Howard | 36 | 86.3K | 0 | Dec 2011 – May 2026 |
| Clay, H. R. -B- O-10-18999 | Quantum Resources Management,llc only | Howard-Glasscock (Glorieta) | Howard | 10 | 59.4K | 2.83K | by Jan 1993 – Nov 2011 |
| Clay, H. R. -G- O-10-2694 | Quantum Resources Management,llc only | Howard Glasscock | Howard | 5 | 54.3K | 2.75K | by Jan 1993 – Nov 2011 |
| Clay, H. R. -B- O-10-2745 | Robertson Resources, Inc. only | Howard Glasscock | Howard | 4 | 51.4K | 27 | by Jan 1993 – Oct 2014 |
| Clay, H.R.-McNalen O-10-2777 | Quantum Resources Management,llc only | Howard Glasscock | Howard | 19 | 50.8K | 594 | by Jan 1993 – Nov 2011 |
| Clay, H. R. O-10-2682 | O'Ryan Oil and Gas only | Howard Glasscock | Howard | 12 | 44.8K | 84 | by Jan 1993 – Nov 2011 |
| Clay, H. R. O-10-2690 | Breitburn Operating L.P. only | Howard Glasscock | Howard | 23 | 41.3K | 4.74K | by Jan 1993 – Nov 2011 |
| Clay, H. R. -A- O-10-48144 | Wash, Robert C. Inc. only | Howard Glasscock (Consolidated) | Howard | 17 | 38.6K | 121 | Dec 2011 – Jul 2026 |
| Clay,h. R., -B- O-10-2778 | O'Ryan Oil and Gas only | Howard Glasscock | Howard | 13 | 37.5K | 83 | by Jan 1993 – Nov 2011 |
| Clay, H. R. -C- O-10-25450 | Quantum Resources Management,llc only | Howard-Glasscock (Glorieta) | Howard | 1 | 35.9K | 944 | by Jan 1993 – Nov 2011 |
| Clay, H. R. O-10-2746 | Vision Natural Resources, LP only | Howard Glasscock | Howard | 6 | 34.6K | 16 | by Jan 1993 – Oct 2014 |
| Clay, H. R. O-10-13460 | Wash, Robert C. Inc. only | Howard Glasscock | Howard | 12 | 25.8K | 118 | by Jan 1993 – Nov 2011 |
| Clay, H. R. -A- O-10-48046 | Robertson Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 5 | 23.7K | 0 | Nov 2014 – Jul 2026 |
| Clay, H. R. -B- O-10-48047 | Robertson Resources, Inc. only | Howard Glasscock (Consolidated) | Howard | 4 | 19.9K | 0 | Nov 2014 – Jul 2026 |
| Clay, H. R. -C- O-10-12702 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 4 | 17.6K | 187 | by Jan 1993 – Nov 2011 |
| Clay, H. R., -A- O-10-20755 | O'Ryan Oil and Gas only | Howard-Glasscock (Glorieta) | Howard | 1 | 17.1K | 83 | by Jan 1993 – Nov 2011 |
| Clay, H. R. -B- O-10-48175 | Wash, Robert C. Inc. only | Howard Glasscock (Consolidated) | Howard | 8 | 16.6K | 121 | Dec 2011 – Jun 2026 |
| Clay, H. R., -B- O-10-18998 | O'Ryan Oil and Gas only | Howard-Glasscock (Glorieta) | Howard | 1 | 14.9K | 84 | by Jan 1993 – Nov 2011 |
| Clay, H. R.-McNallen O-10-41299 | Landmark IP, LLC only | Howard Glasscock (Consolidated) | Howard | 11 | 12.6K | 0 | Dec 2011 – Apr 2022 |
| Clay, H.R.-G- O-10-41291 | Landmark IP, LLC only | Howard Glasscock (Consolidated) | Howard | 4 | 11.5K | 0 | Dec 2011 – Jun 2016 |
| Clay, H. R. East O-10-48010 | Wash, Robert C. Inc. only | Howard Glasscock (Consolidated) | Howard | 3 | 10.2K | 1 | Nov 2014 – May 2026 |
| Clay, H. R. O-10-24284 | Quantum Resources Management,llc only | Howard-Glasscock (Glorieta) | Howard | 2 | 8.84K | 79 | by Jan 1993 – Jan 2005 |
| Clay, H. R. -C- O-10-41666 | Wash, Robert C. Inc. only | Howard Glasscock (Consolidated) | Howard | 4 | 8.74K | 67 | Dec 2011 – Jul 2026 |
| McNallen, H. R. Clay O-10-36595 | Quantum Resources Management,llc only | Howard-Glasscock (Glorieta) | Howard | 3 | 6.64K | 0 | Jan 2001 – Jan 2005 |
| Hodnett, Jim O-10-24324 | Charter Petroleum Company only | Relay (Penn Reef) | Howard | 1 | 4.29K | 4.81K | by Jan 1993 – Jan 1996 |