| Foster 14 O-10-38709 | Bright & Co. only | Lonesome Dove (Miss) | Sterling | 1 | 7.05K | 9.4K | Jan 2008 – Aug 2009 |
| Foster -A- O-9-6155 | Kneupper Oil, LLC only | Tippett (Leonard, Lower) | Crockett | 1 | 6.91K | 14.3K | by Jan 1993 – Aug 2026 |
| Blount, Lois Foster Gas Unit A G-6-222583 | Diversified Production LLC only | Appleby, N. (Rod-TP Cons) | Nacogdoches | 1 | 6.78K | 417K | Aug 2006 – Jun 2023 |
| Foster B Unit G-13-274813 | EOG Resources, Inc. only | Newark, East (Barnett Shale) | Cooke | 1 | 6.64K | 80.3K | Jul 2011 – Jan 2016 |
| Foster O-9-14150 | Stephens & Johnson Operating Co. only | Probandt (Canyon) | Sterling | 1 | 6.59K | 25.2K | Nov 1995 – Jan 2004 |
| Foster, J. R. G-4-10724 | Hilcorp Energy Company only | Hagist Ranch ( Wilcox Upper) | Duval | 1 | 6.41K | 1.55M | by Jan 1993 – Aug 2026 |
| Foster Conger O-10-37705 | Chevron U. S. A. Inc. only | W. A. M. (Wolfcamp) | Sterling | 1 | 6.39K | 85.7K | Mar 2006 – Jan 2021 |
| Foster Creek Estates G-3-216635 | Hilcorp Energy Company only | Fulshear, S. (Cons.) | Fort Bend | 1 | 6.37K | 409K | Apr 2006 – Jul 2026 |
| Foster a Lease /Shallow/ O-13-15955 | Bucaro Energy LLC only | Wichita County Regular | Wichita | 5 | 6.35K | 21 | by Jan 1993 – May 2026 |
| Foster-Hamilton O-13-18886 | Shed Oil Company only | Wichita County Regular | Wichita | 6 | 6.32K | 106 | Oct 1995 – Aug 2026 |
| Foster-Hamilton "A" O-13-20329 | Shed Oil Company only | Wichita County Regular | Wichita | 2 | 6.25K | 106 | Oct 1995 – Aug 2026 |
| CR Foster A O-10-44392 | Crownquest Operating, LLC only | Clyde-Reynolds (Wolfcamp Cons.) | Glasscock | 1 | 6.15K | 222 | Sep 2012 – Sep 2022 |
| Foster "A" O-8-16476 | Cooper Oil & Gas, LLC only | Throckmorton County Regular | Throckmorton | 1 | 6.15K | 39 | by Jan 1993 – Nov 1996 |
| Foster Las G-1-279098 | Ineos USA Oil & Gas LLC only | Eagleville (Eagle Ford-1) | La Salle | 1 | 6.11K | 1.19M | Sep 2015 – Aug 2026 |
| Foster, Nathan O-8-26048 | Reo Operating LLC only | Callahan County Regular | Callahan | 3 | 6.05K | 54 | by Jan 1993 – Feb 2024 |
| Foster Lumber Co. O-3-7169 | Alta Mesa Services, LP only | Cold Springs, E. (Wilcox 7875) | San Jacinto | 1 | 6.05K | 18 | by Jan 1993 – Oct 1996 |
| W.L. Foster O-10-25219 | Patriot Services, Inc. only | Iatan, East Howard | Mitchell | 6 | 6.03K | 23 | by Jan 1993 – Jan 1996 |
| Stroebel, C.G. O-8-13284 | Southwest Gas Systems, Inc. only | Foster (Marble Falls) | Eastland | 19 | 6K | 130K | by Jan 1993 – Aug 2026 |
| Foster G-6-242450 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 5.9K | 398K | May 2008 – Feb 2026 |
| Blount, Lois Foster Gas Unit"a" G-6-224506 | Diversified Production LLC only | Appleby, N. (Rod-TP Cons) | Nacogdoches | 1 | 5.86K | 435K | Dec 2006 – Oct 2024 |
| Foster "57" O-10-33927 | Bright & Co. only | Passout (Mississippian) | Sterling | 1 | 5.78K | 2.5K | Jul 1993 – Mar 1994 |
| Foster, J. Estate G-1-208720 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 5.66K | 611K | Mar 2005 – Aug 2026 |
| Foster, R. W. 16 O-10-38125 | Burk Royalty Co., Ltd. only | W. A. M. (Wolfcamp) | Sterling | 1 | 5.65K | 289K | Dec 2006 – Aug 2026 |
| Cowden, E.F. "F" O-10-24848 | Endeavor Energy Resources L.P. only | Foster | Ector | 2 | 5.58K | 6.62K | by Jan 1993 – Oct 1998 |
| Foster " B " G-3-210246 | Alta Mesa Services, LP only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 5.57K | 134K | Jun 2005 – Sep 2011 |
| Foster "230" O-11-66298 | Sauder Management Company only | Tumbleweed, NE. (Tannehill) | King | 1 | 5.53K | 20 | by Jan 1993 – Jan 1996 |
| RW Foster 16 G-10-171912 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 5.47K | 687K | Dec 1998 – Jul 2026 |
| Foster, J. R. G-4-190649 | Hilcorp Energy Company only | Hagist Ranch (Wilcox 9300) | Duval | 1 | 5.38K | 517K | Sep 2002 – Feb 2025 |
| Foster G-6-242776 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 5.27K | 474K | Jun 2008 – Aug 2026 |
| Foster-Case O-13-21804 | Burleson Oil Company only | Wichita County Regular | Wichita | 2 | 5.24K | 139 | by Jan 1993 – Jan 2026 |
| Foster G-6-242778 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 5.23K | 404K | May 2008 – Aug 2026 |
| Foster, C. D. O-14-1936 | BP America Production Company only | Horizon (Cleveland) | Hansford | 2 | 5.23K | 255K | by Jan 1993 – Apr 2002 |
| Foster G-6-242777 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 5.15K | 394K | Jul 2008 – Aug 2026 |
| Foster 8-3 O-10-37984 | OXY USA WTP LP only | Cowden, South (Canyon 8790) | Ector | 1 | 5.14K | 1.76K | Aug 2005 – Jan 2008 |
| Foster Unit O-8-29603 | Subsurface Production, Inc. only | T. D. A. (Palo Pinto) | Jones | 1 | 5.12K | 0 | Jun 2005 – Nov 2012 |
| Foster, Etal O-6-15365 | Cypress Operating, Inc. only | Whelan (Travis Peak) | Harrison | 1 | 5.11K | 0 | Mar 2013 – Oct 2018 |
| Foster G-6-242130 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 4.99K | 399K | May 2008 – Jul 2026 |
| Foster G-6-242451 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 4.95K | 490K | Jun 2008 – Aug 2026 |
| Foster, J. Estate G-1-212533 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 4.83K | 605K | Jul 2005 – Aug 2026 |
| Foster, J. Estate G-1-208735 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 4.77K | 263K | Mar 2005 – Aug 2026 |
| Foster O-8-29296 | Rjkb Foster Operating LLC only | Nicholas (Caddo) | Callahan | 1 | 4.75K | 15.8K | Jan 2003 – May 2022 |
| Hearn "A" O-8-13335 | Interstate Explorations LLC only | Foster (Marble Falls) | Eastland | 1 | 4.65K | 20.9K | Mar 1993 – Jun 2016 |
| Pinnacle O-10-36671 | Southwest Royalties, Inc. only | Foster (Clearfork-Baxter) | Ector | 1 | 4.65K | 0 | Apr 2001 – Aug 2004 |
| Blount, Lois Foster Gas Unit A G-6-173359 | Weatherly Oil & Gas, LLC only | Appleby, N. (Rod-TP Cons) | Nacogdoches | 1 | 4.61K | 440K | May 1999 – Sep 2019 |
| RW Foster 23 G-10-190286 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 4.56K | 1.35M | Jun 2002 – Aug 2026 |
| Cowden, E.F. "F" O-10-32289 | Raptor Petroleum Develop, LLC only | Foster | Ector | 1 | 4.49K | 1.17K | by Jan 1993 – Nov 2016 |
| Foster Las G-1-278183 | Ineos USA Oil & Gas LLC only | Eagleville (Eagle Ford-1) | La Salle | 1 | 4.43K | 1.17M | Aug 2015 – Aug 2026 |
| Foster, R. W. 15 G-10-204787 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 4.43K | 618K | Nov 2003 – Aug 2026 |
| Foster, George O-1-9821 | D.C. Oil only | Somerset | Atascosa | 1 | 4.42K | 33 | by Jan 1993 – Aug 2026 |
| Foster Est. O-10-9407 | C & S Operating only | Iatan, East Howard | Mitchell | 2 | 4.4K | 22 | by Jan 1993 – Oct 2012 |