| Chalk, Otis O-10-18996 | Apache Corporation only | Howard-Glasscock (Glorieta) | Howard | 20 | 798K | 261K | Jan 1993 – Oct 2015 |
| Chalk, Otis O-10-19011 | Tradition Resources LLC only | Howard-Glasscock (Glorieta) | Howard | 28 | 738K | 243K | Jan 1993 – Feb 2012 |
| Otis O-10-38853 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 7 | 492K | 1.22M | Mar 2008 – Jul 2026 |
| Chalk, Otis O-10-41051 | Unitex Oil & Gas, L.L.C. only | Howard Glasscock (Consolidated) | Howard | 42 | 481K | 26.6K | Dec 2011 – Jul 2026 |
| Chalk, Otis O-10-2792 | Tradition Resources Oper, LLC only | Howard Glasscock | Howard | 50 | 410K | 226K | Jan 1993 – Feb 2014 |
| Chalk, Otis O-10-46457 | Apache Corporation only | Howard Glasscock (Consolidated) | Howard | 23 | 297K | 71.6K | Dec 2011 – Jul 2026 |
| Chalk, Otis /EO/ O-10-2727 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 10 | 243K | 168K | Jan 1993 – Mar 2013 |
| Phillips, Otis "A" O-14-6159 | Burk Royalty Co., Ltd. only | Panhandle Hutchinson County Fld. | Hutchinson | 33 | 241K | 3.24M | Jan 1993 – Jul 2026 |
| Chalk, Otis O-10-2799 | Sahara Operating Company only | Howard Glasscock | — | 17 | 160K | 21 | Jan 1993 – Jul 2012 |
| Chalk, Otis O-10-26950 | Keeley Oil, L.L.C. only | Howard-Glasscock (Glorieta) | Howard | 4 | 149K | 22 | Jan 1993 – Feb 2017 |
| Whittington, Otis O-7-8409 | Linder, John Operating Co., LLC only | East Texas | — | 7 | 126K | 18.7K | Jan 1993 – Jul 2026 |
| Phillips, Otis "B" O-14-6653 | Burk Royalty Co., Ltd. only | Panhandle Moore County Field | Hutchinson | 16 | 115K | 1.88M | Jan 1993 – Jul 2026 |
| Chalk, Otis O-10-41322 | Sahara Operating Company only | Howard Glasscock (Consolidated) | — | 18 | 73.4K | 0 | Dec 2011 – Jul 2026 |
| Chalk, Otis /EO/ O-10-42211 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 7 | 70.3K | 22.7K | Dec 2011 – Jul 2026 |
| Chalk, Otis O-10-2681 | Keeley Oil, L.L.C. only | Howard Glasscock | Howard | 6 | 67.5K | 22 | Jan 1993 – Feb 2017 |
| Phillips, Otis "C" O-14-6797 | Burk Royalty Co., Ltd. only | Panhandle Moore County Field | Moore | 13 | 67.1K | 1.53M | Jan 1993 – Jul 2026 |
| Chalk, Otis O-10-2737 | Apache Corporation only | Howard Glasscock | Howard | 6 | 42.8K | 11.6K | Jan 1993 – Oct 2015 |
| Neill, Otis O-11-64747 | Kinney Incorporated only | V & S (San Andres) | Gaines | 2 | 42.5K | 135 | Jan 1993 – Jul 2026 |
| Chalk, Otis O-10-47929 | Keeley Oil, L.L.C. only | Howard Glasscock (Consolidated) | Howard | 10 | 38.3K | 0 | Sep 2014 – Jul 2026 |
| Otis, John O-10-25639 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 4 | 34.4K | 21 | Jan 1993 – Aug 2012 |
| John Otis -B- O-10-27791 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 4 | 31.4K | 21 | Jan 1993 – Nov 2012 |
| Coles, Otis O-10-32760 | Crescent Energy Operating, LLC only | Payton (5950) | Ward | 1 | 29.3K | 363K | Jan 1993 – Jul 2026 |
| John Otis -A- O-10-26532 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 4 | 25.9K | 21 | Jan 1993 – Aug 2012 |
| Otis, John O-10-41669 | Extex Operating Company only | Howard Glasscock (Consolidated) | Howard | 4 | 23.5K | 0 | Dec 2011 – Jul 2026 |
| Otis, John -A- O-10-41670 | Extex Operating Company only | Howard Glasscock (Consolidated) | Howard | 3 | 22K | 0 | Dec 2011 – Jul 2026 |
| Otis, John -B- O-10-31131 | Legacy Reserves Operating LP only | Howard Glasscock (Clear Fork,mi) | Howard | 1 | 11.5K | 21 | Jan 1993 – Nov 2012 |
| Cole, John Otis O-10-32097 | Pitco Investments, Ltd. only | Howard-Glasscock (Wolfcamp 7400) | Howard | 1 | 10.9K | 130K | Jan 1993 – Dec 2000 |
| John Otis -B- O-10-41844 | Extex Operating Company only | Howard Glasscock (Consolidated) | Howard | 5 | 10.9K | 0 | Dec 2011 – Jul 2026 |
| Henderson, Otis O-13-31517 | Rio Bravo Production, LLC only | Mulkey (4700 Caddo) | Jack | 2 | 10.7K | 3.95K | Jul 2008 – Jul 2026 |
| Chalk, Otis O-10-20660 | Sahara Operating Company only | Howard-Glasscock (Glorieta) | — | 5 | 9.77K | 21 | Jan 1993 – Dec 2018 |
| Phillips, Otis O-14-2363 | Borger Resources 3 LLC only | Panhandle Hutchinson County Fld. | Hutchinson | 4 | 8.05K | 584K | Jan 1993 – Jul 2026 |
| Chalk, Otis O-10-22361 | Westport Oil and Gas Company, LP only | Howard Glasscock (Clear Fork,mi) | Howard | 1 | 7.22K | 1.78K | Jan 1993 – Sep 2005 |
| Otis O-13-33883 | Eagleridge Operating, LLC only | KRS (Marble Falls) | Palo Pinto | 1 | 3.67K | 150K | Dec 2018 – Jul 2026 |
| Otis O-10-31418 | Samedan Oil Corporation only | Howard Glasscock | Howard | 4 | 1.24K | 17 | Jan 1993 – Aug 1996 |
| Wanjura, Otis O-1-2466 | Starr Operating Company only | Fairfield | — | 1 | 643 | 39 | Jan 1993 – Aug 2003 |
| Elmore, Otis O-13-18313 | Woodbine Petroleum, Inc. only | Clay County Regular | — | 1 | 501 | 1.18K | Jan 1993 – Aug 2003 |
| Cox, Otis L. G-1-43743 | Enre Corp. only | Artesia Wells, W. (Wilcox 3630) | — | 1 | 0 | 0 | Jan 1993 – May 1995 |
| Brasher, Homer Otis G-2-65357 | Expanding Exploration Inc. only | Mineral, North (7550) | — | 1 | 0 | 0 | Jan 1993 – Jan 1997 |
| Farmer, Helen Jane G-3-22911 | Russell, Otis only | Needville (BLK 5, Mio. 13,900) | — | 1 | 0 | 0 | Jan 1993 – Oct 1993 |
| Mr. Otis G-6-296664 | Sponte Operating, Inc. only | Carthage (Haynesville Shale) | Panola | 1 | 0 | 6.58M | Feb 2023 – Jul 2026 |
| Rollins, Otis Gas Unit G-8-70905 | E.G. Operating only | Otis Rollins (Marble Falls) | — | 1 | 0 | 0 | Jan 1993 – Sep 1993 |
| Hewgley, Otis G-8-70944 | Brown Industrial Gas OP, Inc. only | Brownwood, South (Marble Falls) | — | 1 | 0 | 7.4K | Jan 1993 – Jan 2022 |
| Morrison, Sid G-8-76176 | Sun-Key Oil Co., Inc. only | Otis Rollins (Marble Falls) | Hood | 1 | 0 | 0 | Jan 1993 – Mar 1997 |
| Hooten, Otis G-8-76999 | Hill Operating LLC only | Poolville, SW. (Bend Congl.) | Parker | 1 | 0 | 14.9K | Jan 1993 – Dec 2009 |
| Nix, T. H. G-8-78203 | St. Johns Operating #1 L.P. only | Otis Rollins (Marble Falls) | Hood | 1 | 0 | 0 | Jan 1993 – Jan 2003 |
| Nix, Otis J. G-8-98191 | Smith Pipe of Abilene only | McIntosh (Strawn) | Hood | 1 | 0 | 33.9K | Jan 1993 – Feb 2009 |
| Nix, Otis J. G-8-98193 | Smith Pipe of Abilene only | McIntosh (Strawn) | Hood | 1 | 0 | 50.3K | Jan 1993 – Feb 2009 |
| Deal, Otis G-9-77648 | Incline Energy only | Buckhorn (Wilberns) | Schleicher | 1 | 0 | 25 | Jan 1993 – Feb 2002 |
| Otis G-9-143527 | Discovery Operating, Inc. only | P. W. (Canyon) | Schleicher | 1 | 0 | 638K | Jan 1993 – Jul 2026 |
| Deal, Otis G-9-187554 | Incline Energy only | Buckhorn (Wilberns) | Schleicher | 1 | 0 | 0 | Feb 2002 – May 2006 |