| Kliewer/Wiebe Trust O-14-7661 | High River Res Operating, LLC only | Farnsworth, N. (Marmaton) | Ochiltree | 1 | 1.43K | 46 | Nov 2005 – Sep 2009 |
| Todd, Robert S. Trust O-4-12543 | Slimhole Engineering Co., Inc. only | La Sara (No. 21 Sand) | Willacy | 1 | 1.42K | 105 | Jan 1996 – Mar 1996 |
| Rust O-9-12005 | Littlepage, Tommy only | FWB (Canyon Sand) | Tom Green | 1 | 1.37K | 23 | by Jan 1993 – Oct 1995 |
| Waggoner, W.T. Estate O-13-30313 | Aaa Oil Trust only | Wilbarger County Regular | Wilbarger | 3 | 1.32K | 0 | Mar 2004 – Jul 2010 |
| Parker Trust -20- O-10-28674 | Bellwether Exploration Company only | Monahans Draw (Clearfork) | Ector | 4 | 1.32K | 7.23K | by Jan 1993 – Dec 1993 |
| Walker-Buckler Trust/TR 40A/Roco O-8-27382 | Beehive Operating, LLC only | Fort Griffin, E. (Strawn) | Shackelford | 1 | 1.31K | 10.2K | Nov 1994 – Oct 1999 |
| Boatmen's Trust Company O-4-11664 | Quest Research & Dev. Corp. only | Harry (Mirando) | Webb | 10 | 1.28K | 43 | by Jan 1993 – May 1998 |
| Duval Ranch, Sec. #100, a/C 1 O-4-2111 | Dewbre, Jerry C., Trustee only | Piedre Lumbre | Duval | 2 | 1.28K | 0 | Jan 2011 – Mar 2015 |
| Schmid Trust O-2-8546 | McCombs Energy LLC only | Maxine (7050) | Live Oak | 1 | 1.27K | 0 | May 2000 – Dec 2000 |
| Douglas Mineral Trust O-13-5796 | Spearco Oil only | Wichita County Regular | Wichita | 10 | 1.26K | 26 | by Jan 1993 – Mar 1997 |
| Haar Trust "17" O-14-8541 | High River Res Operating, LLC only | Perryton, N. E. (Marmaton) | Ochiltree | 1 | 1.23K | 2.74K | Sep 2011 – Dec 2012 |
| Trust "Bs&f" Unit O-8-27481 | Van Operating, Ltd. only | Gatlin (Miss) | Shackelford | 1 | 1.23K | 22.7K | Nov 1994 – Jul 1996 |
| Wardner, G. P. Trustee -A- O-4-8489 | Poor Boy Oilfield Service only | El Tanque | Starr | 1 | 1.21K | 37 | by Jan 1993 – Aug 1996 |
| McLure, J. D. O-8-19528 | McClure, J.D. Trust only | Palo Pinto County Regular | Palo Pinto | 4 | 1.18K | 76 | by Jan 1993 – Jun 2001 |
| Sieber Trust 25 O-10-51141 | Noble Energy Inc only | Phantom (Wolfcamp) | Reeves | 2 | 1.15K | 1.43K | Feb 2019 – Oct 2021 |
| Parker Trust II O-10-29619 | Mayo, Eddie only | Buchanan's Ranch (Ellenburger) | Ector | 1 | 1.15K | 1.95K | by Jan 1993 – Dec 1993 |
| Walker-Buckler Trust/TR 40A/SWD O-8-9385 | Beehive Operating, LLC only | Fort Griffin, E. (Miss) | Shackelford | 3 | 1.14K | 1.55K | by Jan 1993 – Aug 1993 |
| Brown Ranch O-8-15858 | West,gordon T.jr. & Rugeley,stan only | Rust Creek (Miss) | Throckmorton | 1 | 1.12K | 19.7K | by Jan 1993 – Mar 2006 |
| Watson Camp Trust "A" O-1-13176 | U. D. Man, Inc. only | Somerset | Atascosa | 1 | 1.11K | 21 | by Jan 1993 – Sep 1998 |
| University 10 A O-10-27613 | Aaa Oil Trust only | Cardinal (Queen, W. ) | Pecos | 2 | 1.04K | 5.96K | by Jan 1993 – Aug 2007 |
| Landers, C. C. (1844) O-7-6313 | Aaa Oil Trust only | East Texas | Upshur | 1 | 1.01K | 17 | by Jan 1993 – Oct 1994 |
| HTR-Wolf O-8-25534 | Trustar Operating Company Inc. only | Wolf (Serratt Lower) | Coleman | 2 | 1K | 3.47K | Apr 1993 – Dec 2000 |
| Jones, Burrell O-1-9607 | Bledsoe, R.K. Trust Oil Operator only | Pruitt, S. (Escondido) | Atascosa | 1 | 983 | 105 | by Jan 1993 – Apr 2002 |
| Odiorne, Truman N., Trustee O-9-11274 | TXP, Incorporated only | F & H, N. (Cisco 2580) | Menard | 1 | 951 | 4.62K | by Jan 1993 – May 1997 |
| Douglas Mineral Trust -L- O-13-15357 | Wilson-Shab Corp. only | Cash (Strawn 3820) | Wichita | 1 | 935 | 21 | by Jan 1993 – Sep 1994 |
| Carroll, John Trustee O-1-13935 | Ampak Oil Company only | Marcelina Creek (Austin Chalk) | Wilson | 1 | 917 | 10 | Sep 1994 – Dec 1995 |
| Wardner, G. P., Trustee O-4-3971 | Poor Boy Oilfield Service only | El Tanque (1500 Sand) | Starr | 1 | 901 | 37 | by Jan 1993 – Jul 1996 |
| Wilde O-13-32115 | Bunch Family Oil Trust only | Stricker (Tannehill) | Knox | 1 | 883 | 0 | Feb 2012 – Jan 2014 |
| Iowa Realty Trust -123- O-10-21801 | Last Mile Production, LLC only | Tomlaw (Clear Fork 3200) | Pecos | 1 | 856 | 21 | by Jan 1993 – Dec 1994 |
| Bartlett Trust -A- O-1-4797 | Golden Child, Inc. only | Batesville, SW. (San Miguel) | Zavala | 4 | 841 | 14 | by Jan 1993 – Mar 1995 |
| Odiorne, Truman N., Trustee "A" O-9-12685 | Patton, Lloyd J Estate only | P-C, SW (Strawn, Lower) | Menard | 1 | 840 | 7.82K | by Jan 1993 – Aug 1994 |
| T.C. Smith Family Trust O-5-4510 | Barbee, R.L. Operating, Inc. only | Normangee-Flynn | Leon | 1 | 828 | 0 | Jun 2026 – Aug 2026 |
| Trust Clifton Unit O-8-29067 | Van Operating, Ltd. only | Hillview (Caddo) | Shackelford | 1 | 821 | 1.56K | Jul 2001 – Apr 2002 |
| Brown "A" O-8-28917 | Goopco, Inc. only | Rust Creek (Miss) | Throckmorton | 1 | 819 | 510 | Jan 2001 – Mar 2003 |
| Broussard Trust O-3-9051 | Milestone Operating, Inc. only | Lovells Lake (Frio 2) | Jefferson | 2 | 816 | 3.29K | by Jan 1993 – Jun 2001 |
| Corpus Christi Bank & Trust O-4-12586 | Magnum Producing & Operating Co. only | Taft, North (a-1 Frio) | San Patricio | 1 | 787 | 41.6K | Jul 1996 – Oct 1996 |
| Joe Shown Trust Unit O-13-30943 | S.B. Street Operating, Inc. only | Newark, East (Barnett Shale) | Jack | 1 | 777 | 12.5K | Jul 2007 – Mar 2012 |
| Meade Trust O-13-19581 | Thompson, Mark P. only | Archer County Regular | Archer | 4 | 770 | 17 | by Jan 1993 – Jul 1998 |
| C. M. Morton Share Trust O-14-8055 | Rig Petroleum, LLC only | Farnsworth-Conner (Kansas City) | Ochiltree | 1 | 768 | 24.9K | Feb 2009 – Jan 2017 |
| Trust "H. T. & B." Unit O-8-27520 | Van Operating, Ltd. only | Fort Griffin, NE. (Miss) | Shackelford | 1 | 764 | 43.8K | Feb 1995 – Sep 1995 |
| Melton, Edward, Trust O-13-17383 | Boland Tank Trucks only | Goree, NW. (Tannehill) | Knox | 3 | 762 | 55 | by Jan 1993 – May 1998 |
| O'Donnell, William S. Trustee O-3-23739 | Etoco Incorporated only | Dyersdale | Harris | 1 | 758 | 23 | Nov 1999 – Sep 2001 |
| Henderson Trust E O-9-14529 | Apache Corporation only | Howards Creek (Canyon) | Crockett | 1 | 757 | 17.2K | Feb 1997 – Sep 2002 |
| Scurlock Trust "A" O-3-23224 | Sonora Petroleum Corp. only | Clinton, N (Yegua 8600) | Harris | 1 | 751 | 6.59K | Mar 1997 – Feb 1998 |
| Seisma-Richardson Trust - A O-13-29028 | Guidance Oil Developers only | Olney, N W. (Miss.) | Archer | 1 | 750 | 0 | Aug 1995 – Nov 1997 |
| Ferguson III, S. M. Trust O-13-22624 | Ampak Oil Company only | Searcys (Congl) | Hardeman | 1 | 747 | 21 | Feb 1993 – Nov 1997 |
| Kincaid, A. R. Trust 'B' O-9-18791 | Chevron U. S. A. Inc. only | Lin (Wolfcamp) | Crockett | 1 | 740 | 6.91K | Sep 2014 – Oct 2017 |
| Boston Texas Land Trust #8 O-4-12605 | Legacy Corporation, The only | Amore (Vicksburg 6100) | Starr | 1 | 736 | 0 | Apr 1996 – Sep 1996 |
| McCampbell Trust, et al, "A" O-4-13444 | Cabot Oil & Gas Corporation only | McCampbell (Deep Frio Cons.) | Aransas | 1 | 735 | 10.2K | Apr 2007 – Mar 2008 |
| Morris Trust O-1-12704 | Stratco Operating Co., Inc. only | Pearsall (Austin Chalk) | Frio | 1 | 729 | 33 | by Jan 1993 – Aug 1996 |