| Hachar, D. D. G-4-161241 | Columbus Energy, LLC only | Bashara-Hereford (7300) | Webb | 1 | 2.3K | 797K | Jun 1996 – Nov 2016 |
| Rancho Blanco Corp G-4-157719 | Columbus Energy, LLC only | Bashara-Hereford (7300) | Webb | 1 | 2.3K | 773K | Jan 1996 – May 2017 |
| Mathers, Arch O-9-21952 | Bustamante Oil Company only | Jameson (Strawn) | Coke | 1 | 2.29K | 0 | Dec 2022 – Aug 2026 |
| Columbus Field Unit G-3-174920 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 2.28K | 189K | Oct 1999 – Nov 2020 |
| Forbus Estate Gas Unit G-6-94230 | TGNR East Texas II LLC only | Oak Hill (Cotton Valley) | Rusk | 1 | 2.28K | 824K | by Jan 1993 – Aug 2026 |
| Forbus Estate Gas Unit G-6-87042 | Rockcliff Energy Operating LLC only | Oak Hill (Cotton Valley) | Rusk | 1 | 2.27K | 1.54M | by Jan 1993 – Apr 2018 |
| Jameson Etal 1-A O-9-15127 | Bustamante Oil Company only | Bloodworth, N. (Canyon 5650) | Coke | 1 | 2.26K | 8.97K | Mar 2001 – Aug 2026 |
| Columbus Field Unit G-3-129401 | Mitchell Energy Company L.P. only | Columbus ( 6-D Wilcox) | Colorado | 1 | 2.24K | 265K | Aug 1993 – Mar 1998 |
| Spires, L. D. G-8-203457 | Bustamante Oil Company only | Nena Lucia (Strawn Reef) | Nolan | 1 | 2.24K | 418K | Jul 2004 – Aug 2026 |
| Lindholm 86-1 G-1-220976 | Columbus Energy, LLC only | Rhode Ranch, W. (MH-1) | McMullen | 1 | 2.23K | 393K | Sep 2006 – Aug 2026 |
| Jones, Bush O-13-12336 | Venoco, Inc. only | Big Mineral Creek (Strawn) | Grayson | 1 | 2.22K | 1.04K | by Jan 1993 – Jul 1996 |
| Macmahon "C" G-4-204752 | Columbus Energy, LLC only | Volz (Lobo) | Webb | 1 | 2.17K | 447K | Sep 2004 – Aug 2026 |
| B.M.T. G-4-172200 | Columbus Energy, LLC only | Clark Ranch (Lobo) | Webb | 1 | 2.16K | 1.49M | Jan 1999 – Aug 2026 |
| Busey-Gast Unit G-13-261425 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 2.14K | 239K | Mar 2011 – Oct 2025 |
| Rhode, D. W. -25- G-1-221483 | Columbus Energy, LLC only | Rhode Ranch, W. (House 9100) | McMullen | 1 | 2.12K | 151K | Oct 2006 – Jan 2018 |
| Bush O-14-3060 | C & C Oil Producers only | Panhandle Hutchinson County Fld. | Hutchinson | 4 | 2.12K | 3.13K | by Jan 1993 – Jul 1998 |
| Hubberd G-4-150071 | Columbus Energy, LLC only | Liz (9200) | Webb | 1 | 2.11K | 1.2M | Jun 1994 – Dec 2000 |
| Zachry, H. B. G-4-118854 | Columbus Energy, LLC only | Hein (Lobo) | Webb | 1 | 2.1K | 845K | by Jan 1993 – Oct 2008 |
| Alexander, Charles G-4-163712 | Columbus Energy, LLC only | Bashara-Hereford (7300) | Webb | 1 | 2.1K | 238K | Mar 1997 – Sep 2010 |
| Alexander, Charles D. G-4-61280 | Columbus Energy, LLC only | Laredo (Lobo) | Webb | 1 | 2.06K | 324K | by Jan 1993 – Nov 2006 |
| Briones, J.E. -A- G-4-129374 | Columbus Energy, LLC only | Blancas Creek (Lobo 6) | Webb | 1 | 2.06K | 1.12M | by Jan 1993 – Aug 2026 |
| Columbus Field Unit G-3-128976 | Mitchell Energy Company L.P. only | Columbus (5-E Wilcox) | Colorado | 1 | 2.05K | 315K | by Jan 1993 – Dec 1999 |
| Alexander, Charles G-4-192599 | Columbus Energy, LLC only | Hubberd (Lobo) | Webb | 1 | 2.04K | 741K | Nov 2002 – Aug 2026 |
| Busey Gas Unit G-13-144460 | Republic Energy Inc. only | Boonsville (Bend Congl., Gas) | Wise | 1 | 2.02K | 132K | Feb 1993 – Apr 2004 |
| Hubberd G-4-151434 | Columbus Energy, LLC only | Liz (9200) | Webb | 1 | 2.01K | 1.11M | Sep 1994 – Dec 2010 |
| Hubberd G-4-151297 | Columbus Energy, LLC only | Liz (9200) | Webb | 1 | 1.99K | 570K | Jul 1994 – Aug 2026 |
| Hubberd G-4-164321 | Columbus Energy, LLC only | Hubberd (Lobo) | Webb | 1 | 1.97K | 484K | Aug 1997 – Aug 2026 |
| Rancho Blanco G-4-193121 | Columbus Energy, LLC only | Rancho Blanco (Lobo) | Webb | 1 | 1.96K | 860K | Feb 2003 – Dec 2025 |
| Columbus Field Unit G-3-140831 | Mitchell Energy Corporation only | Columbus (11-D) | Colorado | 1 | 1.95K | 45.2K | by Jan 1993 – Sep 1994 |
| Stewart, Maco A G-3-166095 | Columbus Energy, LLC only | Dickinson (Frio Cons.) | Galveston | 1 | 1.93K | 467K | Sep 1997 – Feb 2007 |
| Busy B Gas Unit G-5-263238 | Atlas Operating LLC only | Bear Grass (Travis Peak) | Leon | 1 | 1.92K | 400K | Jul 2011 – Jun 2026 |
| Martinez-Barrera GU G-4-171107 | Columbus Energy, LLC only | Hubberd (Lobo) | Webb | 1 | 1.92K | 1.43M | Oct 1998 – Aug 2026 |
| Tankersley G-9-225737 | Bustamante Oil Company only | Irion, W. (Canyon) | Irion | 1 | 1.87K | 103K | Feb 2007 – May 2022 |
| Atlantic Fee O-10-15311 | Bustos, Martin Oil only | M & M (Clear Fork) | Pecos | 2 | 1.82K | 0 | Apr 2001 – Sep 2008 |
| Forbus Estate Gas Unit G-6-160933 | TGNR East Texas II LLC only | Oak Hill (Cotton Valley) | Rusk | 1 | 1.8K | 1.53M | Oct 1996 – Aug 2026 |
| Bush, J. B. O-5-1043 | Blair, C. Energy Corporation only | Powell | Navarro | 1 | 1.8K | 12 | by Jan 1993 – Oct 2000 |
| Bayou Development B G-3-172236 | Columbus Energy, LLC only | Dickinson (Frio Cons.) | Galveston | 1 | 1.78K | 200K | Sep 1998 – May 2008 |
| Clark, N.H. et Al G-4-59844 | Columbus Energy, LLC only | Laredo (Lobo) | Webb | 1 | 1.78K | 863K | by Jan 1993 – Aug 2026 |
| Central National Bank G-9-101757 | Bustamante Oil Company only | Lygay | Coke | 1 | 1.76K | 225K | by Jan 1993 – Aug 2026 |
| Martinez, B. M. G-4-79748 | Columbus Energy, LLC only | Laredo (Lobo) | Zapata | 1 | 1.75K | 565K | by Jan 1993 – Mar 2014 |
| Debusk O-8-14528 | Fortuna Exploration, Inc. only | Coleman County Regular | Coleman | 1 | 1.71K | 3.41K | by Jan 1993 – Feb 2017 |
| Block, Anna G-4-61897 | Columbus Energy, LLC only | Laredo (Lobo) | Webb | 1 | 1.7K | 785K | by Jan 1993 – Aug 2026 |
| Hubberd, William "A2" G-4-242063 | Columbus Energy, LLC only | Hubberd (Lobo) | Webb | 1 | 1.7K | 536K | Aug 2008 – Aug 2026 |
| Buster O-10-11901 | Cross Timbers Operating Company only | Goldsmith, W. (San Andres) | Ector | 2 | 1.69K | 22 | by Jan 1993 – Oct 1994 |
| Rancho Blanco G-4-202193 | Columbus Energy, LLC only | Rancho Blanco (Lobo) | Webb | 1 | 1.69K | 857K | Jun 2004 – Aug 2015 |
| Hanna O-8-25562 | Bustamante Oil Company only | Eastland County Regular | Eastland | 1 | 1.69K | 3.64K | by Jan 1993 – Dec 2014 |
| McKendrick, W.H. G-4-131667 | Columbus Energy, LLC only | Bashara-Hereford (7300) | Webb | 1 | 1.68K | 1.24M | by Jan 1993 – Aug 2026 |
| Columbus Field Unit G-3-160046 | Mitchell Energy Corporation only | Columbus ( 6-J) | Colorado | 1 | 1.68K | 42.3K | Aug 1996 – May 1999 |
| Williams, R. S. A G-9-80373 | Bustamante Oil Company only | Velrex (Cisco 6260) | Schleicher | 1 | 1.66K | 1.02M | by Jan 1993 – Aug 2026 |
| Malakoff - Peterson G-4-127627 | Columbus Energy, LLC only | San Idelfonso (Lobo) | Webb | 1 | 1.66K | 318K | by Jan 1993 – Mar 2007 |