| Foster G-2-230267 | Welderxp Ltd. only | Cannan, South (10100 Wilcox) | Bee | 1 | 11.9K | 390K | Aug 2007 – Jan 2015 |
| Foster O-3-24463 | Famcor Oil, Inc. only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 11.7K | 50.1K | Sep 2003 – Jun 2005 |
| Foster -10- O-10-27143 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 2 | 11.7K | 329K | by Jan 1993 – Aug 2026 |
| Jones-Foster Unit O-3-22184 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Brazos | 1 | 11.7K | 66.2K | Mar 1993 – Dec 1993 |
| Foster-Rose O-10-35632 | Trek Resources, Inc. only | Conger (Penn) | Sterling | 1 | 11.7K | 159K | Jan 1998 – Mar 2022 |
| Foster A O-13-32924 | JMH Production, LLC only | Jean, NW. (Caddo) | Young | 1 | 11.6K | 55.1K | Jun 2014 – Dec 2020 |
| Foster, Etal O-6-15656 | Cypress Operating, Inc. only | Whelan (Pettit) | Harrison | 1 | 11.4K | 0 | Nov 2018 – Aug 2026 |
| Foster 76 O-10-36597 | Bright & Co. only | Lonesome Dove (Miss) | Sterling | 1 | 11.4K | 14.8K | Apr 2001 – Dec 2007 |
| Foster O-11-68757 | Salida Exploration, LLC only | One Joint Off (Tannehill) | King | 1 | 11.3K | 0 | Mar 2005 – Aug 2016 |
| Foster, J. Estate G-1-212595 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 11.3K | 540K | Apr 2005 – Aug 2026 |
| Foster, Mary Lou G-6-262941 | Valence Operating Company only | Yantis (Rodessa) | Wood | 1 | 11.2K | 610K | Aug 2011 – Mar 2014 |
| Gist B-526 Unit O-10-33381 | Kerr-McGee Corporation only | Foster | Ector | 1 | 11.2K | 8.07K | by Jan 1993 – Dec 1994 |
| Foster-Foster Unit SA 248 G-14-282637 | BE Anadarko II, LLC only | Lipscomb, S.E. (Cleveland) | Lipscomb | 1 | 11.1K | 246K | Nov 2014 – Aug 2026 |
| Palmer, Ruth G. O-10-24365 | Robertson Resources, Inc. only | Foster (San Andres) | Ector | 1 | 11.1K | 7.75K | by Jan 1993 – Oct 2003 |
| Kohler-Foster O-10-33775 | Trio Operating Company, Inc. only | Renderbrook Creek (Miss) | Sterling | 1 | 10.8K | 15 | Mar 1993 – Dec 1994 |
| Perkins O-8-13631 | BJB Transport LLC only | Foster (Marble Falls) | Eastland | 2 | 10.7K | 32 | by Jan 1993 – Jun 2014 |
| Foster G-2-153420 | Beta Oil Corporation only | Tuleta-Wilcox, South (Luling) | Bee | 1 | 10.7K | 1.44M | Jan 1995 – Feb 2006 |
| Foster, E. O-13-16917 | Horansky Burrell Revocable Trust only | Wichita County Regular | Wichita | 1 | 10.6K | 20 | by Jan 1993 – Jul 2026 |
| Foster, J. Estate G-1-238840 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 10.5K | 289K | Mar 2008 – Aug 2026 |
| Foster O-13-15192 | Haigood & Campbell only | Wichita County Regular | Wichita | 11 | 10.4K | 36 | by Jan 1993 – Jul 2001 |
| Foster G-6-241334 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 10.4K | 728K | Dec 2007 – Aug 2026 |
| Foster G-13-187504 | Hess, Jerry Operating Co. only | Newark, East (Barnett Shale) | Wise | 1 | 10.4K | 344K | Feb 2002 – Aug 2026 |
| Foster Lumber Co. "D" G-3-232308 | Oretta Holdings LLC only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 10.3K | 406K | Oct 2007 – Apr 2012 |
| Foster Lumber Co. "A" O-3-21291 | Famcor Oil, Inc. only | Cold Springs (Wilcox 9400) | San Jacinto | 1 | 10.3K | 195K | by Jan 1993 – Feb 1994 |
| Foster Lumber Co. "B" G-3-185615 | Alta Mesa Services, LP only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 10.2K | 386K | Jan 2001 – May 2003 |
| Morris O-8-17480 | Rjkb Foster Operating LLC only | Nicholas (Duffer) | Callahan | 1 | 10.1K | 233K | by Jan 1993 – Aug 2026 |
| Foster, Mary Lou Gas Unit G-6-273261 | Valence Operating Company only | Yantis (Heard Zone) | Wood | 1 | 9.91K | 602K | May 2014 – Aug 2026 |
| Foster, J. R. G-4-78104 | Hilcorp Energy Company only | Hagist Ranch (Wilcox 9300) | Duval | 1 | 9.85K | 338K | by Jan 1993 – Apr 2000 |
| Foster, J.R. G-4-126991 | Devon Energy Production Co, L.P. only | Hagist Ranch(wilcox Basal House) | Duval | 1 | 9.69K | 570K | by Jan 1993 – Jun 2007 |
| CR Foster O-10-41093 | Williams, Clayton Energy, Inc. only | Spraberry (Trend Area) | Glasscock | 4 | 9.61K | 6.7K | Mar 2011 – Aug 2012 |
| Foster-McPeek G-13-239187 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Denton | 1 | 9.46K | 508K | Oct 2006 – Jul 2015 |
| Foster -B- O-13-18204 | Azteca Operating, Inc. only | Wichita County Regular | Wichita | 10 | 9.06K | 142 | by Jan 1993 – Mar 2025 |
| Foster Farms G-3-212010 | Hilcorp Energy Company only | Fulshear, S. (Cons.) | Fort Bend | 1 | 8.96K | 389K | Aug 2005 – Aug 2026 |
| Foster "D" G-3-258132 | Oretta Holdings LLC only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 8.81K | 92.6K | Apr 2010 – Sep 2011 |
| Foster Lumber Co. "B" G-3-198175 | Alta Mesa Services, LP only | Cold Springs (8150) | San Jacinto | 1 | 8.63K | 270K | Sep 2003 – Jan 2005 |
| CR Foster O-10-44391 | Oxyrock Operating, LLC only | Clyde-Reynolds (Wolfcamp Cons.) | Glasscock | 1 | 8.59K | 8.84K | Sep 2012 – May 2023 |
| Foster Lumber Co. 'A' O-3-25822 | Oretta Holdings LLC only | Cold Springs, W. (Wilcox 7800 B) | San Jacinto | 1 | 8.58K | 46.1K | Oct 2011 – Feb 2016 |
| Foster 60 O-10-63758 | Kek Exploration LLC only | Renderbrook Creek (Miss) | Sterling | 1 | 8.52K | 0 | Jun 2025 – Aug 2026 |
| Foster Conger 30 O-10-33549 | Range Production Company only | Conger (Penn) | Sterling | 1 | 8.38K | 496K | by Jan 1993 – Jun 2006 |
| Foster G-6-138009 | Chisos, Ltd. only | Oak Hill (Cotton Valley) | Rusk | 1 | 8.27K | 2.16M | by Jan 1993 – Aug 2026 |
| Foster G-6-145474 | Chisos, Ltd. only | Oak Hill (Cotton Valley) | Panola | 1 | 8.22K | 1.93M | Mar 1993 – Aug 2026 |
| L. Foster -5- O-10-25454 | Range Production Company only | Conger (Penn) | Sterling | 2 | 8.01K | 217K | by Jan 1993 – Jun 2006 |
| Foster, J. R. G-4-66091 | Devon Louisiana Corporation only | Hagist Ranch (Wilcox 9300) | Duval | 1 | 8.01K | 155K | by Jan 1993 – Apr 2000 |
| Foster, J. Estate G-1-232748 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 7.65K | 292K | Dec 2007 – Aug 2026 |
| Blount, Lois Foster Gas Unit A G-6-217198 | Diversified Production LLC only | Appleby, N. (Rod-TP Cons) | Nacogdoches | 1 | 7.52K | 421K | Dec 2005 – Oct 2024 |
| Kohler-Foster O-10-33598 | Trio Operating Company, Inc. only | Ace of Spades (Ellenburger) | Sterling | 1 | 7.51K | 1.87K | by Jan 1993 – Feb 1995 |
| Foster O-8-30638 | Delta Oil & Gas Ltd. only | Ley (Strawn 5560) | Haskell | 1 | 7.5K | 131 | Aug 2010 – Aug 2026 |
| Foster 248 G-14-164228 | Unbridled Resources, LLC only | Higgins, W. (Morrow) | Lipscomb | 1 | 7.48K | 2.81M | Dec 1996 – Oct 2017 |
| Foster "57" O-10-34164 | Bright & Co. only | Passout (Strawn) | Sterling | 1 | 7.27K | 70.8K | Jun 1994 – Jan 1999 |
| Foster G-6-239962 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 7.21K | 480K | Apr 2008 – Aug 2026 |