| Howell, J.J. G-4-123368 | Exxcel Operating Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 0 | Jan 1993 – Sep 1998 |
| G. E. Neblett et al Gas Unit G-4-155703 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 13.5M | Jul 1995 – Jul 2026 |
| Howell, J. J. G-4-156755 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 3.24M | Dec 1995 – Jul 2026 |
| Al-Martinez State #1 G-4-162690 | Marwell Petroleum Ltd Partnrship only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 351K | Jan 1997 – Dec 2025 |
| Brannan G-4-165080 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.78M | Aug 1997 – Jul 2026 |
| Don Cameron et al G. U. G-4-166618 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.05M | Oct 1997 – Jul 2026 |
| Cameron Gas Unit G-4-167513 | Dewbre Petroleum Corporation only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 68.7K | Dec 1997 – Feb 2001 |
| Nimmo Gas Unit NO.1 G-4-168052 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 458K | Sep 1997 – Jul 2026 |
| Bentsen Bros. - State G-4-173707 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 4.8M | Apr 1999 – Jul 2026 |
| Howell, J.J. G-4-174738 | Hilcorp Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.2M | Sep 1999 – Jul 2026 |
| Judd Estate-State G-4-176288 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 3.11M | Feb 2000 – Jul 2026 |
| Howell, J.J. G-4-178689 | Hilcorp Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.45M | Jul 2000 – Jul 2026 |
| Brannan G-4-179274 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 3.84M | Sep 2000 – Jul 2026 |
| Howell, J.J. G-4-182346 | Hilcorp Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.95M | Mar 2001 – Jul 2026 |
| Don Cameron et al G. U. G-4-184748 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 19.4K | Aug 2001 – Jul 2026 |
| La Copita Gas Unit G-4-185714 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 5.62M | Oct 2001 – Jul 2026 |
| Brannan G-4-186019 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.8M | Nov 2001 – Jul 2026 |
| Howell J J G-4-187270 | Hilcorp Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.48M | Jul 2001 – Jul 2026 |
| G. E. Neblett et al Gas Unit G-4-190113 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 5.19M | Jul 2002 – Jul 2026 |
| Brannan G-4-190698 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.97M | Aug 2002 – Jul 2026 |
| Nimmo Gas Unit No. 1 G-4-191114 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 467K | Aug 2002 – Jul 2026 |
| Barrera, F. -State G-4-191703 | Headington Oil Company, L.P. only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 0 | Sep 2002 – Apr 2003 |
| Barrera, F. - State G-4-191858 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.82M | Nov 2002 – Jul 2026 |
| Nimmo Gas Unit No. 1 G-4-192918 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.78M | Dec 2002 – Jul 2026 |
| Don Cameron et al Gas Unit G-4-193947 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 658K | Mar 2003 – Jul 2026 |
| Nimmo Gas Unit No. 1 G-4-194405 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 632K | Jan 2003 – Jul 2026 |
| Judd Estate-State G-4-195623 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.24M | Jun 2003 – Jul 2026 |
| Don Cameron et al G.U. G-4-197762 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 929K | Oct 2003 – Jul 2026 |
| Barrera, F. - State G-4-199162 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 102K | Dec 2003 – Jul 2026 |
| Bentsen Bros. "B" G-4-199557 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.49M | Jan 2004 – Jul 2026 |
| Judd Estate-State G-4-199634 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 984K | Feb 2004 – Jul 2026 |
| Bentsen Bros. "B" G-4-203830 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 6.47M | Jul 2004 – Jul 2026 |
| Neblett, G.E. et al Gas Unit G-4-205373 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.4M | Aug 2004 – Jul 2026 |
| Bentsen Bros. - State G-4-206391 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 5.1M | Nov 2004 – Jul 2026 |
| Don Cameron et al G.U. G-4-207916 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 339K | Jan 2005 – Jul 2026 |
| Judd Estate-State G-4-208626 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.85M | Feb 2005 – Jul 2026 |
| Garza-Hitchcock et al G. U. G-4-208762 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 932K | Mar 2005 – Jul 2026 |
| La Copita Gas Unit G-4-208845 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.92M | Apr 2005 – Jul 2026 |
| Saga G-4-212783 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.11M | Sep 2005 – Jul 2026 |
| La Copita Gas Unit G-4-213687 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.94M | Oct 2005 – Jul 2026 |
| Bentsen Bros. - State G-4-214065 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.49M | Oct 2005 – Jul 2026 |
| Bentsen Bros. "B" G-4-215048 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 593K | Nov 2005 – Jul 2026 |
| Judd Estate-State G-4-215481 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 813K | Dec 2005 – Jul 2026 |
| Garza-Hitchcock et al G. U. G-4-218682 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 994K | Feb 2006 – Jul 2026 |
| Brannan G-4-218794 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 450K | Mar 2006 – Jul 2026 |
| Brannan G-4-218967 | Wagner Oil Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 1.13M | Apr 2006 – Jul 2026 |
| Saga G-4-219650 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 665K | Mar 2006 – Jul 2026 |
| Saga G-4-220401 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.49M | Feb 2006 – Jul 2026 |
| Neblett, G. E. et al Gas Unit G-4-220751 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 2.06M | Jun 2006 – Jul 2026 |
| Saga G-4-221665 | Merit Energy Company only | La Copita (Vicksburg Cons.) | Starr | 1 | 0 | 352K | Jun 2006 – Jul 2026 |