| Foster Lumber Co. D O-3-10829 | Jet Oil Producers, Inc. only | Cold Springs (Yegua -C- 4400) | San Jacinto | 1 | 19.2K | 5.36K | by Jan 1993 – May 1998 |
| Foster, J. Estate G-1-194975 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 18.7K | 360K | Mar 2003 – Jan 2026 |
| Foster, R. W. 23 O-10-38470 | Stanolind Production LLC only | Lower Half (Wolfcamp) | Sterling | 1 | 18.4K | 135K | Sep 2005 – Sep 2019 |
| Foster O-10-24789 | Basa Resources, Inc. only | Conger (Penn) | Sterling | 6 | 18.4K | 839K | by Jan 1993 – Aug 2026 |
| Jones, Foster L. O-8-24450 | Sojourner Drilling Corporation only | Rule (5000) | Haskell | 1 | 18.4K | 2.3K | by Jan 1993 – Sep 2011 |
| Foster, Ross O-10-25792 | Basa Resources, Inc. only | Conger (Penn) | Sterling | 2 | 18.4K | 411K | by Jan 1993 – Aug 2026 |
| Foster, J. Estate G-1-208733 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 18K | 699K | Feb 2005 – Aug 2026 |
| Foster, J. R. G-4-66042 | Hilcorp Energy Company only | Hagist Ranch (Wilcox 9800) | Duval | 1 | 17.7K | 1.22M | by Jan 1993 – Aug 2026 |
| Foster Farms G-3-215692 | Hilcorp Energy Company only | Fulshear, S. (Cons.) | Fort Bend | 1 | 17.4K | 1.38M | Oct 2005 – Aug 2026 |
| Lutzenberger O-8-17405 | Rjkb Foster Operating LLC only | Nicholas (Duffer) | Callahan | 1 | 17.2K | 215K | by Jan 1993 – Feb 2025 |
| Foster, J. Estate G-1-200718 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 17K | 916K | Dec 2003 – Aug 2026 |
| Foster, J. Estate G-1-194970 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 16.8K | 541K | Apr 2003 – Aug 2026 |
| Foster, Ross -B- O-10-25793 | Basa Resources, Inc. only | Conger (Penn) | Sterling | 3 | 16.8K | 403K | by Jan 1993 – Aug 2026 |
| Pmi Foster O-1-17673 | 1859 Operating LLC only | Fairfield | Medina | 6 | 16.7K | 0 | Dec 2013 – May 2026 |
| Foster O-11-70387 | Rock Fish Operating LLC only | Wells, South (Spraberry) | Dawson | 1 | 16.6K | 476 | Sep 2015 – Jul 2026 |
| Foster, J.R. G-4-67066 | Hilcorp Energy Company only | Hagist Ranch (Wilcox 9300) | Duval | 1 | 16.5K | 1.28M | by Jan 1993 – Mar 2009 |
| Foster, J. Estate O-1-11777 | Silver Pines Energy Corp. only | Sun T S H (Olmos) | La Salle | 2 | 16.5K | 56.2K | by Jan 1993 – Oct 2001 |
| Foster O-8-31020 | JTL Oil Company LLC only | Highnote (Strawn) | Haskell | 1 | 16.1K | 0 | Mar 2012 – Aug 2026 |
| Foster -A- O-10-25424 | C & S Operating only | Iatan, East Howard | Mitchell | 16 | 16.1K | 19 | by Jan 1993 – Oct 2012 |
| Foster -A- G-3-237300 | Alta Mesa Services, LP only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 16K | 378K | May 2008 – Oct 2011 |
| HS Foster C O-10-46778 | Helms Oil & Gas, LLC only | Cowden, South | Ector | 3 | 16K | 26.8K | Jun 2015 – Nov 2018 |
| Cowden,e.f. "G" O-10-24835 | Raptor Petroleum Develop, LLC only | Foster | Ector | 2 | 16K | 4.57K | by Jan 1993 – Nov 2016 |
| Foster Estate G-3-112967 | Famcor Oil, Inc. only | Foster (Wilcox Cons.) | Montgomery | 1 | 15.7K | 453K | by Jan 1993 – Dec 2009 |
| Foster, J. Estate G-1-112234 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 15.7K | 365K | by Jan 1993 – Aug 2026 |
| Foster Las G-1-275667 | Ineos USA Oil & Gas LLC only | Eagleville (Eagle Ford-1) | La Salle | 1 | 15.4K | 1.76M | Aug 2014 – Aug 2026 |
| Collum O-13-21058 | Jones, L. E. Operating, Inc. only | Jud,(foster Sand) | Grayson | 1 | 15.4K | 21.6K | by Jan 1993 – Sep 2024 |
| Cowden -D- O-10-9891 | Raptor Petroleum Develop, LLC only | Foster | Ector | 1 | 15.3K | 1.82K | by Jan 1993 – Jan 2019 |
| Foster -A- O-10-13324 | Basa Resources, Inc. only | Iatan, East Howard | Mitchell | 2 | 15.1K | 44 | by Jan 1993 – Aug 2026 |
| Foster LBR Co O-3-10978 | GWM Operating Company, LLC only | Humble | Harris | 5 | 14.7K | 21 | by Jan 1993 – Oct 2025 |
| Foster, J. Estate G-1-204700 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 14.7K | 489K | Aug 2004 – Aug 2026 |
| Foster, J. R. O-4-1178 | Foster Energy Company only | Hagist Ranch ( Argo) | Duval | 1 | 14.1K | 376 | by Jan 1993 – May 2024 |
| Foster O-9-6064 | Kneupper Oil, LLC only | Tippett, W. (Wolfcamp 5050) | Crockett | 1 | 14.1K | 34.1K | by Jan 1993 – Aug 2026 |
| Foster, R. W. 15 O-10-37847 | Burk Royalty Co., Ltd. only | W. A. M. (Wolfcamp) | Sterling | 2 | 14K | 448K | Jun 2006 – Aug 2026 |
| Blount, Lois Foster Gas Unit A G-6-87529 | Diversified Production LLC only | Appleby, N. (Rod-TP Cons) | Nacogdoches | 1 | 14K | 613K | by Jan 1993 – Oct 2024 |
| Foster O-8-12438 | Cross Cut Petroleum, LLC only | Brown County Regular | Brown | 1 | 13.9K | 20 | by Jan 1993 – Dec 2024 |
| Foster, J.R. O-1-7668 | K.A. Barnes Oil & Gas Oper, LLC only | Fairfield | Medina | 5 | 13.9K | 20 | by Jan 1993 – Aug 2026 |
| Foster Las G-1-276775 | Ineos USA Oil & Gas LLC only | Eagleville (Eagle Ford-1) | La Salle | 1 | 13.7K | 1.35M | Feb 2014 – Aug 2026 |
| Foster, J. R. G-4-70892 | Devon Louisiana Corporation only | Hagist Ranch(wilcox Basal House) | Duval | 1 | 13.6K | 405K | by Jan 1993 – Jul 2004 |
| Foster Ranch O-10-38755 | Walter Oil & Gas Corporation only | Lonesome Dove (Miss) | Sterling | 1 | 13.5K | 0 | May 2008 – Nov 2009 |
| Foster Farms Deep G-3-233982 | Energy Corporation of America only | Fulshear, S. (Cons.) | Fort Bend | 1 | 13.5K | 637K | Sep 2007 – Jul 2008 |
| Ginn-Foster O-1-11711 | Centex Pipe & Equipment, Inc. only | Lytton Springs | Caldwell | 1 | 13.5K | 0 | Jun 1998 – Dec 2022 |
| Foster Lumber Co. -A- O-3-24581 | Alta Mesa Services, LP only | Cold Springs (Wilcox, Cons.) | San Jacinto | 1 | 13.4K | 167K | Aug 2004 – Oct 2011 |
| Foster, R. W. -23- O-10-8559 | D & D Well Service, L.L.C. only | Parochial-Bade (Queen Sand) | Sterling | 7 | 13.4K | 23 | by Jan 1993 – Aug 2025 |
| Foster, Mary Lou O-5-3999 | Valence Operating Company only | Como (Rodessa Hill, Lo.) | Wood | 1 | 13.3K | 93.8K | Feb 2013 – May 2024 |
| Foster Las G-1-277452 | Ineos USA Oil & Gas LLC only | Eagleville (Eagle Ford-1) | La Salle | 1 | 13.1K | 1.67M | Mar 2015 – Aug 2026 |
| Foster, J. Estate G-1-112232 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 13K | 326K | by Jan 1993 – Jan 2026 |
| Foster, J. R. G-4-70530 | Ocean Energy, Inc. only | Hagist Ranch ( Wilcox Lo. 9700) | Duval | 1 | 12.5K | 536K | by Jan 1993 – Mar 2002 |
| Foster Estate G-3-117834 | Cameron, Paul E., Jr., Inc. only | Foster (Wilcox C) | Montgomery | 1 | 12.4K | 255K | by Jan 1993 – Jan 2001 |
| Foster, J. Estate G-1-208947 | Petrovybe Opco LLC only | Sun T S H (Olmos) | La Salle | 1 | 12.2K | 462K | Dec 2004 – Aug 2026 |
| Foster, R. T. Jr. 28 O-10-39710 | Arch Oil & Gas, LLC only | Conger, SW (Wolfcamp) | Sterling | 2 | 12.1K | 1.34K | Oct 2009 – Jan 2018 |