| Campbell-Fraser G-3-242357 | Famcor Oil, Inc. only | Foster (Wilcox Cons.) | Montgomery | 1 | 4.36K | 131K | Jul 2008 – Dec 2009 |
| Foster, J. Estate G-1-211029 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 4.35K | 290K | Jan 2005 – Aug 2026 |
| Foster, J. Estate G-1-214736 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 4.35K | 279K | Jan 2006 – Aug 2026 |
| Foster, J.R. G-4-79720 | Hilcorp Energy Company only | Hagist Ranch ( Wilcox K, Middle) | Duval | 1 | 4.1K | 384K | by Jan 1993 – Aug 2026 |
| Foster, J. Estate G-1-220589 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 4.08K | 497K | Jun 2006 – Aug 2026 |
| Foster "A" G-3-281737 | Oretta Holdings LLC only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 4.04K | 130K | Dec 2016 – Feb 2023 |
| Foster Lumber Co. D G-3-269144 | Oretta Holdings LLC only | Cold Springs (Wilcox 7,800) | San Jacinto | 1 | 3.99K | 301K | May 2012 – Jan 2016 |
| Foster, W. L. Jr. "B" O-10-28186 | D & D Enterprises only | Conger (Penn) | Sterling | 4 | 3.99K | 47K | by Jan 1993 – Aug 2026 |
| Foster Las O-1-17209 | Chesapeake Operating, L.L.C. only | Eagleville (Eagle Ford-1) | La Salle | 1 | 3.85K | 183K | Sep 2013 – Jan 2014 |
| Foster, R. W. 15 G-10-186516 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 3.76K | 278K | Oct 2001 – Aug 2026 |
| Foster "D" G-3-258994 | Alta Mesa Services, LP only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 3.71K | 51.8K | Sep 2010 – Sep 2011 |
| Foster, J. R. G-4-180291 | Hilcorp Energy Company only | Hagist Ranch (Wilcox Reagan) | Duval | 1 | 3.71K | 365K | Oct 2000 – Aug 2026 |
| Cowden Ranch '9' O-10-48051 | Rust Oil Corp. only | Foster | Ector | 1 | 3.7K | 0 | Aug 2016 – Sep 2023 |
| Foster, Doris et Al G-4-116369 | Property Development Group, Inc. only | Braman (Yegua) | Jim Wells | 1 | 3.68K | 155K | by Jan 1993 – Aug 2008 |
| Foster-Haney O-13-29608 | Exit Oil & Gas only | Boedeker, SE (Strawn) | Montague | 1 | 3.61K | 11.2K | Jan 1999 – May 2012 |
| Foster Lumber Co. G-3-51027 | Famcor Oil, Inc. only | Cold Springs, W. (Wilcox 9,620) | San Jacinto | 1 | 3.6K | 38K | by Jan 1993 – Dec 1993 |
| Foster Conger G-10-147079 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 3.46K | 364K | Oct 1993 – Aug 2026 |
| Foster G-10-81735 | Rayden only | Conger (Penn) | Sterling | 1 | 3.44K | 305K | by Jan 1993 – Aug 2026 |
| Foster, J. Estate O-1-14945 | Fletcher Operating, LLC only | Sun T S H (Olmos) | La Salle | 1 | 3.39K | 127K | Mar 2008 – Feb 2022 |
| Foster Lumber Co. O-3-3073 | Royal Production Company, Inc. only | Mercy | San Jacinto | 1 | 3.37K | 4.65K | by Jan 1993 – Jul 1995 |
| Foster -C- O-13-14773 | S. S. Oil Company only | Wichita County Regular | Wichita | 20 | 3.35K | 82 | by Jan 1993 – Oct 2001 |
| Foster Unit III Las G-1-276757 | Ineos USA Oil & Gas LLC only | Eagleville (Eagle Ford-1) | La Salle | 1 | 3.34K | 925K | Jan 2014 – Aug 2026 |
| Foster O-3-27244 | Flamingo Operating, LLC only | Fort Trinidad, East (Buda) | Madison | 1 | 3.34K | 6.92K | May 2017 – Oct 2018 |
| Foster, J. Estate G-1-227615 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 3.34K | 361K | Feb 2007 – Aug 2026 |
| Foster, Mary Lou G-6-104188 | Valence Operating Company only | Yantis (Heard, Up.) | Wood | 1 | 3.19K | 78.3K | by Jan 1993 – Jul 2001 |
| Foster, J. Estate G-1-212615 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 3.15K | 293K | Aug 2005 – Aug 2026 |
| RT Foster 10 G-10-130788 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 3.13K | 190K | by Jan 1993 – Aug 2026 |
| Foster Conger G-10-149369 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 3.05K | 412K | May 1994 – Sep 2024 |
| Foster, J.R. G-4-78960 | Hilcorp Energy Company only | Hagist Ranch ( Wilcox K, Middle) | Duval | 1 | 3.05K | 59.7K | by Jan 1993 – Jul 2017 |
| Foster, T. F. O-10-33025 | National Energy Group, Inc. only | Tri-Search (Leonard) | Sterling | 2 | 3.02K | 21 | by Jan 1993 – Feb 1997 |
| Foster G-13-233033 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Denton | 1 | 2.99K | 387K | May 2007 – Jan 2015 |
| Foster "57" G-10-150706 | Bright & Co. only | Passout (Strawn) | Sterling | 1 | 2.99K | 36.2K | Jul 1994 – May 1995 |
| Foster -B- O-8-31532 | 5L Properties, Inc. only | Lueders, S. (King Sand) | Jones | 2 | 2.97K | 0 | Apr 2014 – Aug 2023 |
| Foster O-10-23072 | Samson Lone Star, LLC only | Spraberry (Trend Area) | Martin | 1 | 2.84K | 6.6K | by Jan 1993 – Nov 1996 |
| Foster, J. R. -B- O-4-1176 | Hilcorp Energy Company only | Hagist Ranch ( Argo) | Duval | 1 | 2.82K | 10 | Mar 1993 – Feb 2019 |
| Foster, Frank O-13-18222 | O'Neal Oil Company only | Carminati (4600) | Montague | 1 | 2.81K | 11 | by Jan 1993 – Aug 2025 |
| Foster 18 G-10-149108 | King Energy Resources only | Conger (Penn) | Sterling | 1 | 2.81K | 626K | Feb 1994 – Aug 2026 |
| Foster, Campbell G-3-147779 | Cameron, Paul E., Jr., Inc. only | Foster South (Wilcox 8983) | Montgomery | 1 | 2.81K | 820K | Oct 1993 – Apr 1999 |
| Foster S. Price O-10-31618 | Vanco Oil & Gas Corp. only | Jameson, North (Strawn) | Nolan | 1 | 2.77K | 52.9K | by Jan 1993 – Sep 2018 |
| Foster "B-23" O-10-25996 | Blackmun Family Partners, L.P. only | Conger (Penn) | Sterling | 3 | 2.77K | 98.1K | by Jan 1993 – Nov 2006 |
| Stroebel, C.G. "B" O-8-21299 | Southwest Gas Systems, Inc. only | Foster (Marble Falls) | Eastland | 3 | 2.74K | 44.8K | by Jan 1993 – Aug 2026 |
| Foster O-13-30716 | Nortex Production Co., LLC only | Wichita County Regular | Wichita | 8 | 2.73K | 0 | Apr 2007 – May 2016 |
| Foster Lumber Co. D O-3-24488 | Jet Oil Producers, Inc. only | Cold Springs (Yegua -C- 4400) | San Jacinto | 1 | 2.68K | 997 | Nov 2001 – Dec 2008 |
| Mobil-Foster O-13-28211 | Hood, Joe B. only | Wichita County Regular | Wichita | 5 | 2.67K | 21 | by Jan 1993 – Jun 1996 |
| Foster 8 G-10-132871 | Burk Royalty Co., Ltd. only | Conger (Penn) | Sterling | 1 | 2.67K | 217K | by Jan 1993 – Aug 2026 |
| Foster, R. T. 17 G-10-71245 | Tall Dune Resources, LLC only | Conger (Penn) | Sterling | 1 | 2.66K | 189K | by Jan 1993 – Oct 2010 |
| Blount, Lois Foster G-6-129073 | Merit Energy Company only | Black Bayou (James) | Nacogdoches | 1 | 2.65K | 564K | by Jan 1993 – Aug 2026 |
| Foster Farms Deep G-3-206442 | Energy Corporation of America only | Fulshear, S. (Cons.) | Fort Bend | 1 | 2.64K | 139K | Nov 2004 – Aug 2005 |
| Foster, Zella Heirs O-4-10235 | Fredco only | J. R. (5580) | Duval | 1 | 2.6K | 67.2K | Dec 1994 – Jun 2011 |
| Foster, C.R. O-8-21938 | Flare Oil Inc. only | Humphrey Gray | Jones | 1 | 2.6K | 8 | by Jan 1993 – Apr 1996 |