| Foster, J. R. G-4-10769 | Hilcorp Energy Company only | Hagist Ranch ( Wilcox Lo. 9700) | Duval | 1 | 37.2K | 951K | by Jan 1993 – Aug 2026 |
| Foster, Ross O-10-17822 | Aggietech Oil, Ltd. only | Parochial-Bade, E. (Glorieta) | Sterling | 5 | 37.2K | 117 | by Jan 1993 – Mar 2005 |
| Foster Lumber Co B O-3-26985 | Jet Oil Producers, Inc. only | Cold Springs | San Jacinto | 1 | 37.2K | 12.2K | Jul 2014 – Aug 2026 |
| Lochridge -A- O-13-6344 | Gilmore, Leo Oil, Inc. only | Kempner (Foster Sand) | Wichita | 6 | 37K | 22 | by Jan 1993 – Aug 2026 |
| Foster, Mamie O-11-63814 | EOG Resources, Inc. only | Big Wheel (Spraberry) | Dawson | 1 | 36.9K | 21 | by Jan 1993 – Nov 2021 |
| L. Foster-4- O-10-26546 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 5 | 35.8K | 1.28M | by Jan 1993 – Aug 2026 |
| Foster Lumber Co. -P- Unit G-3-6249 | Sandel Operating Company only | Fostoria (10,400) | Montgomery | 1 | 35.7K | 1.43M | by Jan 1993 – Jun 2007 |
| Foster, J. Estate G-1-205322 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 34.9K | 788K | Aug 2004 – Aug 2026 |
| Foster D Unit G-13-273795 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Cooke | 1 | 34.3K | 1.71M | Jul 2011 – Aug 2026 |
| Foster C Unit G-13-273677 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Cooke | 1 | 34.2K | 581K | Jun 2011 – Jan 2024 |
| Foster a Unit G-13-273676 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Cooke | 1 | 33.5K | 323K | Jun 2011 – Aug 2026 |
| Foster Price O-8-26186 | J V A Operating Company, Inc. only | JMM (Ellenburger) | Nolan | 1 | 33.4K | 25.7K | by Jan 1993 – Jun 1995 |
| Foster, Ed & Seffie O-13-5661 | Burleson Oil Company only | Wichita County Regular | Wichita | 3 | 32.6K | 140 | by Jan 1993 – Aug 2026 |
| Foster O-3-16563 | Sellers Lease Service, Inc. only | Rutledge (Wilcox 6500) | Colorado | 1 | 30.9K | 62 | by Jan 1993 – Jan 2021 |
| L. Foster -9- O-10-25398 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 7 | 30.6K | 1.67M | by Jan 1993 – Aug 2026 |
| Foster, Mimi & Papa O-3-19426 | Magnolia Oil & Gas Operating LLC only | Kurten (Austin Chalk) | Brazos | 1 | 30K | 19 | by Jan 1993 – Mar 2026 |
| Foster Lumber Co. "A" G-3-83555 | Famcor Oil, Inc. only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 29.7K | 619K | by Jan 1993 – Dec 1997 |
| Foster -A- O-3-25820 | Oretta Holdings LLC only | Cold Springs, W. (Wilcox 7800 B) | San Jacinto | 2 | 29.6K | 175K | Nov 2011 – Aug 2025 |
| Foster Lumber Co. "A" G-3-181181 | Oretta Holdings LLC only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 29.1K | 815K | Jan 2001 – Apr 2011 |
| Foster '7' O-10-43285 | Basin Oil & Gas Operating, LLC only | Spraberry (Trend Area) | Gaines | 4 | 28.8K | 16.3K | Oct 2012 – May 2024 |
| Foster 248 G-14-278035 | BE Anadarko II, LLC only | Lipscomb, S.E. (Cleveland) | Lipscomb | 1 | 27.8K | 372K | Aug 2013 – Apr 2025 |
| Foster Heirs "B" O-4-14232 | Aurora Resources Corporation only | Eagle Hill | Duval | 3 | 27.8K | 0 | Jul 2023 – Aug 2026 |
| Foster G-6-232143 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 27.5K | 1.67M | Oct 2007 – Aug 2026 |
| Foster Lumber Co. "A" G-3-185589 | Famcor Oil, Inc. only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 27.3K | 399K | Jul 2001 – Jul 2004 |
| Foster, Ed. -A- O-13-12596 | 5 G Resources, LLC only | Wichita County Regular | Wichita | 4 | 27K | 21 | by Jan 1993 – Nov 2021 |
| Foster O-8-30739 | CDJ Oil Company, LLC only | Humphrey Gray | Jones | 1 | 27K | 0 | Aug 2010 – Apr 2022 |
| Foster 14 O-10-39697 | Kek Exploration LLC only | Passout (Strawn) | Sterling | 1 | 27K | 62.4K | Sep 2009 – Jul 2025 |
| Foster Pet. Corp. O-11-68864 | XTO Energy Inc. only | Russell (Clearfork Consolidated | Gaines | 1 | 26.7K | 13.8K | Nov 2005 – Oct 2010 |
| Foster, H. S. "B" NCT-1 G-10-96252 | Endeavor Energy Resources L.P. only | Headlee (Devonian) | Midland | 1 | 26.5K | 86.4K | by Jan 1993 – Oct 2001 |
| Foster, W. L. O-10-13513 | Royalty Resources, L.L.C. only | Iatan, East Howard | Howard | 1 | 26.2K | 103 | by Jan 1993 – Apr 2017 |
| Foster 4 O-8-31373 | Salty Lime Energy, LLC only | Throckmorton County Regular | Throckmorton | 8 | 26.1K | 0 | Nov 2013 – Dec 2024 |
| Foster Farms Deep G-3-196848 | Proline Energy Resources Inc only | Fulshear, S. (Cons.) | Fort Bend | 1 | 26K | 2.01M | Jul 2003 – Aug 2026 |
| Foster, J. Estate G-1-214734 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 24.4K | 702K | Dec 2005 – Aug 2026 |
| Foster "1" O-11-65848 | Sauder Management Company only | Tumbleweed, NW. (Tannehill) | Dickens | 13 | 23.6K | 14K | by Jan 1993 – Jun 1993 |
| Foster O-13-15243 | LC Operating, LLC only | Wichita County Regular | Wichita | 8 | 23.5K | 291 | by Jan 1993 – Feb 2025 |
| Foster Lumber Co. "E" G-3-191846 | Oretta Holdings LLC only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 23.4K | 800K | Aug 2002 – Jun 2025 |
| Foster, Ed. Estate O-13-5100 | Texas Green Energy Services LLC only | Wichita County Regular | Wichita | 25 | 23.3K | 21 | by Jan 1993 – Jun 2026 |
| Foster Lumber Co. O-3-22805 | Famcor Oil, Inc. only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 23.3K | 99.9K | Feb 1995 – Dec 1995 |
| Foster, J. Estate G-1-187454 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 23.2K | 565K | Nov 2001 – Aug 2026 |
| Ruth G. Palmer O-10-33634 | Bustamante Oil Company only | Foster | Ector | 1 | 23.2K | 7.19K | by Jan 1993 – Aug 2026 |
| Foster Lumber Co. "A" G-3-185409 | Oretta Holdings LLC only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 23K | 682K | Apr 2001 – Jun 2025 |
| Foster O-9-18137 | Upp Operating, LLC only | Ozona, NE. (Canyon 7520) | Schleicher | 2 | 22.9K | 589K | Nov 2012 – Jul 2026 |
| Foster Oil Unit O-3-22036 | Famcor Oil, Inc. only | Cold Springs (Wilcox 7,800) | San Jacinto | 1 | 22.8K | 21.3K | Apr 1993 – Feb 1997 |
| Foster -A- O-10-16887 | Baker Operating, Inc. only | Cowden, South | Ector | 1 | 22.6K | 9 | by Jan 1993 – Apr 2026 |
| Foster 'D' O-3-25831 | Oretta Holdings LLC only | Cold Springs (Wilcox 7,800) | San Jacinto | 1 | 22.1K | 191K | Oct 2011 – Oct 2018 |
| Foster, B. J. -A- O-10-35215 | Baker Operating, Inc. only | Double -H- (Grayburg) | Ector | 1 | 21.7K | 0 | Feb 1997 – Aug 2026 |
| Foster G-6-232664 | Brookston Energy, Inc. only | Carthage, North (Cotton Valley) | Harrison | 1 | 21.6K | 822K | Oct 2007 – Jan 2026 |
| Foster, Amanda O-10-36155 | Rwa, LLC only | Amanda Foster (Wolfcamp) | Glasscock | 1 | 21.3K | 11.5K | Jul 1999 – Aug 2022 |
| Foster, J. Estate G-1-205803 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 20.9K | 753K | Oct 2004 – Aug 2026 |
| Foster O-1-4385 | Merica Oil Operating Company LLC only | Big Foot | Frio | 10 | 20.9K | 116 | by Jan 1993 – Oct 2021 |