| Cartwright, L. (Cartwright Unit) O-6-13918 | Mitchell Energy Corporation only | Lassater (Travis Peak, Gas) | Marion | 1 | 9.83K | 105K | Dec 1998 – Jul 1999 |
| King, Kirk O-6-13569 | Mitchell Energy Company L.P. only | Lassater (Travis Peak, Gas) | Marion | 2 | 1.55K | 40.1K | Nov 1995 – Feb 2002 |
| Brooks Unit (Hall Estate) G-6-16277 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | — | 1 | 0 | 1.63M | Jan 1993 – Jul 2026 |
| Neal, J. A. Unit G-6-32534 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | — | 1 | 0 | 922K | Jan 1993 – Jul 2026 |
| Kelsey, Annie D. Gas Unit G-6-35704 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | — | 1 | 0 | 859K | Jan 1993 – Jul 2026 |
| Neal, J. A. Unit G-6-72729 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | — | 1 | 0 | 626K | Jan 1993 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-74273 | Devon Energy Production Co, L.P. only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 2.46M | Jan 1993 – May 2009 |
| Brooks Unit (Hall Estate) G-6-74512 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 0 | Jan 1993 – Jul 2026 |
| Neches Iron Co. "C" G-6-77199 | Mitchell Energy Corporation only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 51.5K | Jan 1993 – Jun 1997 |
| Brooks Unit (Hall Estate) G-6-77886 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.02M | Jan 1993 – Jul 2026 |
| Montgomery Unit G-6-78717 | Devon Energy Production Co, L.P. only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 583K | Jan 1993 – Mar 2010 |
| Mitchell "J" G-6-107124 | Marathon Oil Company only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 154K | Jan 1993 – Jan 1995 |
| Brooks Unit (Hall Estate) G-6-135299 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 2.99M | Jan 1993 – Jul 2026 |
| Waldrop "A" G-6-135736 | Buffco Production Inc. only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.02M | Jan 1993 – Sep 2015 |
| Cartwright, L. (Cartwright Unit) G-6-136356 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 3.1M | Jan 1993 – Jul 2026 |
| Schmitt Gas Unit G-6-138168 | Pecos Petroleum Company only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 33.6K | Jan 1993 – Nov 1997 |
| Simpson Family G-6-157265 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.1M | Oct 1995 – Jul 2026 |
| Brooks Unit (Hall Estate) G-6-157275 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 180K | Oct 1995 – Jul 2026 |
| Kelsey, Annie D. Gas Unit G-6-162744 | Linn Operating, LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 721K | Nov 1996 – Aug 2017 |
| Brooks Unit (Hall Estate) G-6-165338 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 2.04M | Sep 1997 – Jul 2026 |
| Simpson Family G-6-166879 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 951K | Aug 1997 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-167099 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 2.47M | Dec 1997 – Jul 2026 |
| Neal, J. A. Unit G-6-167610 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 2.03M | Dec 1997 – Jul 2026 |
| Kelsey, Annie D. Gas Unit G-6-170222 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.01M | Jul 1998 – Jul 2026 |
| Brooks Unit (Hall Estate) G-6-170282 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 2.42M | Aug 1998 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-170588 | Mitchell Energy Corporation only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 34.9K | Sep 1998 – Dec 1998 |
| Brooks Unit (Hall Estate) G-6-170948 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.46M | Sep 1998 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-173427 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 825K | May 1999 – Jul 2026 |
| Orr G-6-173473 | Buffco Production Inc. only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 24.4K | Jan 1999 – Aug 2017 |
| Orr Unit G-6-173944 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 737K | Jun 1999 – Jul 2026 |
| Brooks Unit (Hall Estate) G-6-174267 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.48M | Jul 1999 – Jul 2026 |
| Neal, J.A. Unit G-6-174270 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 259K | Jul 1999 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-174864 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 645K | Jun 1999 – Jul 2026 |
| Clifton, W.B. G-6-178784 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 943K | Jul 2000 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-179015 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 868K | Jun 2000 – Jul 2026 |
| Simpson Family G-6-179086 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1M | Jul 2000 – Jul 2026 |
| Annie D. Kelsey Gas Unit G-6-179872 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 705K | Aug 2000 – Jul 2026 |
| Brooks Unit (Hall Estate) G-6-180907 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 326K | Dec 2000 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-182005 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 915K | Jan 2001 – Jul 2026 |
| Orr Unit G-6-182872 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 530K | Apr 2001 – Jul 2026 |
| Orr Unit G-6-186161 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.56M | Aug 2001 – Jul 2026 |
| Neal, J. A. Unit G-6-186368 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 1.01M | Mar 2001 – Jul 2026 |
| Clifton, W.B. G-6-186409 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 376K | Sep 2001 – Jul 2026 |
| Kelsey, Annie D. Gas Unit G-6-186904 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 0 | Jan 2002 – Jul 2026 |
| Wade G-6-193830 | Camterra Resources, Inc. only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 421K | Mar 2003 – Nov 2009 |
| Conner G-6-194491 | Buffco Production Inc. only | Lassater (Travis Peak, Gas) | Cass | 1 | 0 | 11 | May 2001 – Jul 2026 |
| Cartwright, L. (Cartwright Unit) G-6-195721 | Linder, John Operating Co., LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 308K | Jul 2002 – Jul 2026 |
| Klabzuba G-6-195742 | Brooks Petroleum Company only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 96.8K | Jun 2003 – Dec 2009 |
| King Heirs G-6-197991 | Camterra Resources, Inc. only | Lassater (Travis Peak, Gas) | Cass | 1 | 0 | 8.59K | Jul 2003 – Sep 2005 |
| Bradley, Kyle G-6-211226 | Randall Exploration, LLC only | Lassater (Travis Peak, Gas) | Marion | 1 | 0 | 571K | Apr 2005 – Jun 2010 |