| Sackett, S. "A" O-8-15154 | Family Trust B, The only | Coleman County Regular | Coleman | 2 | 8.38K | 24.6K | by Jan 1993 – May 2017 |
| Ikard Trust O-13-31541 | Rogers Drilling Co., Inc. only | Archer County Regular | Archer | 1 | 8.23K | 0 | Jan 2010 – Oct 2017 |
| Cowden "19" O-10-31579 | Rust Oil Corp. only | Cowden (Cisco) | Ector | 1 | 8.16K | 21 | by Jan 1993 – Feb 2019 |
| Trusty Oil Unit O-3-23920 | Foundation Energy Management LLC only | Village Mills, East (T-1) | Hardin | 1 | 8.15K | 35.6K | Nov 2000 – Aug 2010 |
| White Trust O-9-15733 | Geosurveys, Inc. only | Needle Creek (Canyon) | McCulloch | 1 | 8.11K | 0 | May 2005 – Sep 2014 |
| Burnett -B- O-13-13504 | Aaa Oil Trust only | Wichita County Regular | Wichita | 7 | 8.06K | 21 | by Jan 1993 – Jul 2010 |
| Iowa Realty Trust -A- O-10-4723 | Bebco Parts Industries, Inc. only | Pecos Valley (High Gravity) | Pecos | 12 | 8.04K | 23 | by Jan 1993 – Aug 2002 |
| Matthews Trust "13" O-8-28470 | Clear Fork, Incorporated only | E 115 (Miss. Cons.) | Shackelford | 1 | 8.03K | 341K | Mar 1998 – Feb 2011 |
| Carter, M. K. Trust O-10-31600 | Texas Consolidated Pet. Corp. only | Edwards -04- (Bend, S.) | Crane | 1 | 8K | 22.7K | by Jan 1993 – Oct 1998 |
| Kirk Trustee O-13-24758 | Three J Operating Company, Inc. only | Bowen (Middle Caddo) | Jack | 2 | 7.99K | 21 | by Jan 1993 – Nov 2010 |
| Wood Trust "A" O-2-7858 | Anaqua Oil & Gas, Inc. only | Wood High (5850) | Victoria | 1 | 7.98K | 35.5K | Feb 1993 – Dec 1993 |
| Buckler Trust O-8-12367 | Karper Oil & Gas Corporation only | Walker-Davis (Congl. 3850) | Stephens | 2 | 7.95K | 696K | by Jan 1993 – Jun 2006 |
| Henderson O-3-22565 | Hunt, Wm. Herbert, Trust Est. only | Crooked Bayou (L. Ck. Mtn.) | Liberty | 1 | 7.79K | 43.1K | Nov 1994 – Jul 1995 |
| Richardson, J. T. Trust "B" O-13-21498 | Olney Oil LLC only | Archer County Regular | Archer | 4 | 7.67K | 171 | by Jan 1993 – Sep 2021 |
| Lacey, Robert A. Trust O-5-3092 | Bowles Energy, Inc. only | Alabama Ferry (Glenrose D, West) | Leon | 4 | 7.62K | 55.6K | Feb 1993 – Mar 2008 |
| USA Trust O-13-31436 | XTO Energy Inc. only | Newark, East (Barnett Shale) | Denton | 1 | 7.61K | 560K | Jun 2009 – Feb 2017 |
| Woodward Trust O-8-26357 | Saguaro Petroleum, LLC only | Strawn, NW. (Marble Falls) | Palo Pinto | 1 | 7.49K | 126K | by Jan 1993 – Nov 2016 |
| Richardson Trust O-13-20315 | Palmer, Scott Oil only | Archer County Regular | Archer | 4 | 7.44K | 21 | by Jan 1993 – Apr 2013 |
| Henderson Family Trust State 20 O-10-45704 | Seven Loaves Energy LLC only | Sand Hills (Wichita Albany, S.) | Crane | 1 | 7.39K | 0 | Jul 2014 – Dec 2020 |
| Standard Trust O-3-27498 | McA Petroleum Corporation only | Muldoon, SW. (Arnim-2) | Fayette | 1 | 7.38K | 0 | Jan 2019 – Aug 2026 |
| Kincaid, A.R. Trust "D" O-9-13897 | Chevron U. S. A. Inc. only | Ozona, NE. (Canyon Sand) | Crockett | 1 | 7.28K | 81.1K | Nov 1995 – Jul 2013 |
| Parker Trust "11" O-10-34909 | Sandridge Expl. and Prod., LLC only | Monahans Draw (Canyon 8388) | Ector | 1 | 7.25K | 153 | Apr 1996 – Mar 2008 |
| Bailey, Dr. R. O-8-1000 | Family Trust B, The only | Coleman County Regular | Coleman | 2 | 7.16K | 21.5K | by Jan 1993 – May 2016 |
| Hunter Trust O-10-39403 | Southwest Royalties, Inc. only | Spraberry (Trend Area) | Sterling | 1 | 7.1K | 0 | Mar 2009 – Mar 2010 |
| Iowa Realty Trust O-10-18584 | Limark Corporation only | Pecos Valley (Fusselman #2) | Pecos | 1 | 7.02K | 22 | by Jan 1993 – Feb 1998 |
| Sterling Family Trust O-10-33457 | Trend Exploration Company only | Vincent, SE. (Strawn) | Howard | 1 | 7.01K | 222K | by Jan 1993 – Dec 1997 |
| Kincaid, A. R. Trust O-9-15773 | Scout Energy Management LLC only | Helbing (Clearfork) | Crockett | 2 | 6.91K | 155K | Jun 2005 – Aug 2026 |
| Iowa Realty Trust -A- O-10-20792 | Molder, Tom only | Pecos Valley, SE. (Yates 1620) | Pecos | 2 | 6.89K | 22 | by Jan 1993 – Apr 2013 |
| Realty Trust O-10-36978 | Incline Energy only | Pecos Valley (Wolfcamp) | Pecos | 1 | 6.89K | 6.5K | Dec 2002 – Jan 2004 |
| Sterling Trust O-13-33390 | FX Energy Operating, LLC only | KRS (Marble Falls) | Jack | 1 | 6.85K | 232K | Jul 2015 – Jun 2025 |
| Longfellow SS 600 O-10-38514 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 6.56K | 42.4K | Jan 2008 – Feb 2013 |
| Watson Camp Trust O-1-10825 | Aminex USA, Inc. only | Somerset | Atascosa | 23 | 6.56K | 22 | by Jan 1993 – Dec 2003 |
| Amacker Trust 37 O-9-14845 | Legacy Reserves Operating LP only | Tippett, W. (Wolfcamp 5050) | Crockett | 1 | 6.5K | 361K | Aug 1998 – Sep 2009 |
| Jackson Trust 'C' O-13-30577 | Kroh Operating LLC only | Mer-Mag (Bryson) | Jack | 2 | 6.49K | 0 | Jan 2006 – Aug 2017 |
| Daly, Scott L. Trustee -A- O-8-3165 | Arrowhead Productions, LP only | Cal-Tex (Caddo) | Parker | 6 | 6.45K | 207K | by Jan 1993 – Jan 2009 |
| Lloyd Trust O-3-26305 | Wildfire Energy Operating LLC only | Kurten (Buda) | Madison | 1 | 6.43K | 25.9K | Nov 2012 – Jul 2026 |
| Baker Trust O-10-35570 | Linn Operating, Inc. only | B.C. (Dean) | Howard | 1 | 6.42K | 12.3K | Sep 1997 – Dec 1999 |
| Oloughlin, C. C., Sr., Trust O-14-1588 | Discovery Operating, Inc. only | Twin (Des Moines) | Hansford | 4 | 6.39K | 67.1K | by Jan 1993 – Apr 1996 |
| Maxey, S. E. Estate O-13-16845 | Beisch, Rusty only | Jack County Regular | Jack | 7 | 6.39K | 132 | by Jan 1993 – Oct 2006 |
| Corpus Christi Bank & Trust O-4-11647 | Magnum Producing & Operating Co. only | Plymouth (5390) | San Patricio | 1 | 6.38K | 21 | by Jan 1993 – Dec 1994 |
| Watson Camp Trust O-1-8260 | Calk Oil Company only | Somerset | Atascosa | 5 | 6.36K | 19 | by Jan 1993 – Jul 2026 |
| Iowa Realty Trust "A" O-10-34054 | MBR Resources, Inc. only | Lehn-Apco, S. (Wichita-Albany) | Pecos | 1 | 6.34K | 260K | Dec 1993 – Jun 2001 |
| Lester Trust "2" O-10-37336 | Pioneer Natural Res. USA, Inc. only | Desperado (Atoka) | Midland | 1 | 6.34K | 77.6K | Feb 2004 – Dec 2015 |
| Holland, W. W. -C- O-7-8377 | Aaa Oil Trust only | East Texas | Rusk | 2 | 6.34K | 1.28K | by Jan 1993 – Jan 2002 |
| Hudgins Trust O-13-32673 | Atoka Operating, Inc. only | Southmayd, North (Baker-Viola) | Grayson | 1 | 6.25K | 59.2K | Sep 2013 – Jan 2019 |
| King, J. A. O-14-8248 | AK Pearson Family Trust only | Pan Petro (Cleveland) | Ochiltree | 2 | 6.11K | 0 | May 2011 – Aug 2026 |
| Realty Trust O-10-37419 | Incline Energy only | Pecos Valley (Ellenburger) | Pecos | 1 | 6.02K | 15.9K | Jan 2003 – Jan 2004 |
| Spencer Trust 20 O-10-46860 | SM Energy Company only | Spraberry (Trend Area) | Howard | 1 | 5.96K | 11K | Jun 2014 – Apr 2021 |
| Pearson, W.T. O-1-10045 | Trustar Operating Company Inc. only | Minerva-Rockdale | Milam | 33 | 5.94K | 70 | Nov 1994 – Nov 2017 |
| Snyder Mineral Trust 143 O-8-20715 | L.C.S. Production Company only | SMT (Cross Cut) | Callahan | 2 | 5.91K | 5.16K | by Jan 1993 – Dec 2000 |