| Guitar -20- O-10-28773 | Hartoil Corporation only | Moore | Howard | 3 | 1.49K | 19 | by Jan 1993 – Apr 2016 |
| Patterson et Al O-10-26219 | D & T Energy only | Moore | Howard | 2 | 1.48K | 29 | by Jan 1993 – May 2000 |
| Rogers O-10-33130 | Marshall & Winston, Inc. only | Caverna (Leonard) | Howard | 1 | 1.47K | 1K | by Jan 1993 – Mar 1994 |
| Waldron, Shirley, et Al O-10-24600 | Trey Exploration, Inc. only | Moore | Howard | 1 | 1.46K | 21 | by Jan 1993 – Jan 1995 |
| Blassingame O-10-34051 | EP Operating Limited Partnership only | Luther, SE. (Penn Canyon) | Howard | 1 | 1.45K | 10.1K | Dec 1993 – Jun 1994 |
| Powell 26 G-10-164461 | Highpeak Energy Holdings, LLC only | Signal Peak (Wolfcamp) | Howard | 1 | 1.44K | 890K | Jul 1997 – Sep 2020 |
| Clay, H. R., -A- O-10-41031 | O'Ryan Oil and Gas only | Howard Glasscock (Consolidated) | Howard | 1 | 1.41K | 0 | Jan 2012 – Mar 2026 |
| Read -a- (Miss) O-10-25676 | McCann Corporation only | Coahoma (Miss) | Howard | 3 | 1.41K | 44.1K | by Jan 1993 – Sep 2004 |
| Petty Unit 48 O-10-34577 | Cobra Oil & Gas Corporation only | Petty 48 (Upper Strawn) | Howard | 1 | 1.4K | 12.1K | Jul 1995 – Apr 1996 |
| Cloud O-10-38154 | Unit Petroleum Company only | Signal Peak (Wolfcamp) | Howard | 1 | 1.36K | 7.72K | Apr 2007 – Feb 2011 |
| Hyman -H- O-10-41123 | Sterling Oil and Gas LLC only | Howard Glasscock (Consolidated) | Howard | 3 | 1.36K | 0 | Dec 2011 – Jun 2023 |
| Stockton, W.E. "B" O-10-23297 | Marathon Oil Company only | Howard Glasscock | Howard | 1 | 1.36K | 21 | by Jan 1993 – Dec 1997 |
| Shasta 31 O-10-45944 | New Height Energy, LLC only | Petty 48 (Upper Strawn) | Howard | 1 | 1.35K | 5.76K | Jan 2015 – May 2026 |
| Stallings Adkins O-10-45804 | OXY USA Inc. only | Cedar Flats (Miss.) | Howard | 1 | 1.33K | 3.23K | Feb 2015 – Jul 2016 |
| Case-Rakow State 68 G-10-169194 | Lateral Oil and Gas, LLC only | Signal Peak (Wolfcamp) | Howard | 1 | 1.32K | 41.7K | Feb 1998 – Nov 2015 |
| Connally O-10-46243 | OXY USA Inc. only | Moore (Strawn 9500) | Howard | 1 | 1.32K | 2.39K | Jun 2014 – Jul 2018 |
| Richardson, E.W.#1 O-10-26730 | Millennium Resources, LP only | Varel (San Andres) | Howard | 2 | 1.32K | 8 | May 1993 – Jun 2006 |
| Texaco "25" G-10-170851 | Highpeak Energy Holdings, LLC only | Signal Peak (Wolfcamp) | Howard | 1 | 1.32K | 579K | Aug 1998 – Oct 2015 |
| Barr O-10-34998 | Sharp Image Energy, Inc. only | Vincent (Canyon, Lower) | Howard | 1 | 1.31K | 1.43K | Mar 1996 – Oct 1996 |
| Lockhart, S. L. "C" O-10-32365 | Platinum Exploration Inc. only | Vealmoor, East (Clearfork) | Howard | 1 | 1.31K | 22 | by Jan 1993 – Jun 1995 |
| Horace Garrett Estate et Al O-10-49575 | Partee Drilling Inc. only | Moore (Miss) | Howard | 1 | 1.29K | 5.91K | Dec 2017 – Feb 2019 |
| Douthit -a- Unit O-10-11282 | Wash, Robert C. Inc. only | Howard Glasscock | Howard | 11 | 1.29K | 182 | by Jan 1993 – Nov 2011 |
| Quinn 16 O-10-35087 | Morita Services, LLC only | Ernie Pinnell (Fusselman) | Howard | 1 | 1.27K | 0 | Oct 1996 – Nov 1998 |
| Otis O-10-31418 | Samedan Oil Corporation only | Howard Glasscock | Howard | 4 | 1.24K | 17 | by Jan 1993 – May 1994 |
| Hodnett 23 O-10-38680 | Diamondback E&P LLC only | Knott (Pennsylvanian) | Howard | 1 | 1.24K | 6.57K | Dec 2007 – Jun 2008 |
| Powell Ranch "24" O-10-36505 | L.C.S. Production Company only | Signal Peak (Wolfcamp) | Howard | 2 | 1.24K | 223K | Dec 2000 – Feb 2002 |
| Meador, J. J. G-10-148294 | Patterson Petroleum, Inc. only | Luther, SE. (Penn Reef) | Howard | 1 | 1.22K | 279K | Jan 1994 – Apr 1995 |
| Lauderdale O-11-64506 | Discovery Operating, Inc. only | Ackerly (Dean Sand) | Howard | 1 | 1.2K | 1.6K | by Jan 1993 – Sep 1994 |
| Fleeman, Louise O-10-35122 | Renaud Oil Corporation only | Wildhorse (Spraberry Lime) | Howard | 1 | 1.18K | 659 | Aug 1996 – Feb 1997 |
| Echols-Metcalf Unit "2" O-10-36263 | Whiting Oil and Gas Corporation only | Signal Peak (Wolfcamp) | Howard | 1 | 1.18K | 14K | Jan 2000 – Jun 2009 |
| Flanagan O-10-26094 | PCT Oil Co. only | Red Draw (Miss) | Howard | 3 | 1.17K | 15.6K | by Jan 1993 – Jan 1994 |
| Patterson-Duncan O-10-8870 | Hartoil Corporation only | Moore | Howard | 4 | 1.13K | 21 | by Jan 1993 – Nov 2001 |
| Grantham O-10-30040 | Vaion Energy Texas Oil Operation only | Moore | Howard | 1 | 1.13K | 21 | by Jan 1993 – Aug 2017 |
| Ackerly, S E B O-10-37014 | Sharp Image Energy, Inc. only | Middleton (Canyon Reef) | Howard | 1 | 1.13K | 0 | Jan 2003 – Apr 2003 |
| Settles, W.R. -B- TT O-10-47928 | Wash, Robert C. Inc. only | Howard Glasscock (Consolidated) | Howard | 2 | 1.12K | 88 | Sep 2014 – Jul 2026 |
| Powell Ranch "38" G-10-172859 | Highpeak Energy Holdings, LLC only | Signal Peak (Wolfcamp) | Howard | 1 | 1.12K | 228K | Feb 1999 – Sep 2008 |
| TXL, B. S. -D- O-10-49803 | Grayrock Energy II, LLC only | Snyder (San Andres) | Howard | 1 | 1.12K | 0 | Nov 2017 – Jul 2024 |
| Quinn -35- NE O-10-30662 | Hartoil Corporation only | Moore | Howard | 4 | 1.12K | 533 | by Jan 1993 – Mar 2004 |
| Phillips, Hart O-10-39758 | Sheridan Production Company, LLC only | Howard Glasscock | Howard | 1 | 1.11K | 0 | Dec 2009 – Nov 2010 |
| Hyman -G- O-10-41122 | Sterling Oil and Gas LLC only | Howard Glasscock (Consolidated) | Howard | 1 | 1.11K | 0 | Dec 2011 – Apr 2023 |
| Texaco "35" G-10-161317 | Highpeak Energy Holdings, LLC only | Signal Peak (Wolfcamp) | Howard | 1 | 1.1K | 386K | Nov 1996 – Dec 2010 |
| Adams 38 O-10-35581 | Cobra Oil & Gas Corporation only | Adams 31 (Canyon Reef) | Howard | 1 | 1.09K | 0 | Dec 1997 – Apr 1998 |
| Read -A- O-10-25361 | Texas Reexploration Operating LC only | Coahoma, N. (Fussel) | Howard | 3 | 1.08K | 39.4K | by Jan 1993 – Sep 2004 |
| Robinson, Charles O-10-22374 | Cross Timbers Operating Company only | Hutto, South (Wolfcamp) | Howard | 1 | 1.07K | 21 | by Jan 1993 – Sep 1994 |
| Carolyn O-10-38414 | Scout Energy Management LLC only | Spraberry (Trend Area) | Howard | 1 | 1.06K | 0 | Jun 2007 – Dec 2008 |
| Broughton-Davis Unit O-10-32627 | Valence Operating Company only | Big Spring (Strawn) | Howard | 1 | 1.06K | 220 | by Jan 1993 – Dec 1999 |
| Phillips, Roy -C- O-10-30782 | Southwest Energy Devel.,inc. only | Moore | Howard | 1 | 1.06K | 27 | by Jan 1993 – May 1999 |
| Douthitt O-10-48128 | Golden Specialties Oil & Gas only | Howard Glasscock (Consolidated) | Howard | 9 | 1.05K | 0 | Dec 2014 – Mar 2019 |
| Roberts, Dora -B-(southland) O-10-41315 | Apv McCamey LLC only | Howard Glasscock (Consolidated) | Howard | 2 | 1.05K | 0 | Dec 2011 – Apr 2021 |
| Southland -D- O-10-31187 | Guthrie, A. K. Operating Co. only | Howard Glasscock | Howard | 1 | 1.05K | 21 | by Jan 1993 – Jan 1995 |