| Foster, Mary O-10-2890 | Basa Resources, Inc. only | Iatan, East Howard | Mitchell | 495 | 12.8M | 2.65M | Jan 1993 – Jul 2026 |
| South Foster Unit O-10-17541 | Occidental Permian Ltd. only | Foster | Ector | 224 | 12.6M | 3.31M | Jan 1993 – Jul 2026 |
| Foster O-11-15125 | BCP Resources, LLC only | D. E. B. (Wolfcamp) | Gaines | 28 | 5.63M | 1.22M | Jan 1993 – Jul 2026 |
| Witcher, J. E. O-10-21532 | Occidental Permian Ltd. only | Foster | Ector | 112 | 5.09M | 1.36M | Jan 1993 – Jul 2026 |
| Gist Unit O-10-19373 | Aghorn Operating, Inc. only | Foster | Ector | 155 | 4.57M | 1.18M | Jan 1993 – Jul 2026 |
| North Foster Unit O-10-16940 | Aghorn Operating, Inc. only | Foster | Ector | 119 | 3.1M | 1.34M | Jan 1993 – Jul 2026 |
| Johnson, J. L. -31- O-10-21835 | Basin Oil & Gas Operating, LLC only | Foster | Ector | 29 | 2.29M | 488K | Jan 1993 – Jul 2026 |
| Foster Unit #1 & 2 O-6-228 | Glori Energy Holdings Inc. only | Coke | — | 2 | 2.29M | 334K | Jan 1993 – Jun 2016 |
| Foster-Johnson Unit O-10-16793 | Aghorn Operating, Inc. only | Foster | Ector | 161 | 2.17M | 645K | Jan 1993 – Jul 2026 |
| Foster, W. L. #1 O-10-2910 | Bce-Mach III LLC only | Iatan, East Howard | Mitchell | 99 | 1.94M | 144K | Jan 1993 – Jul 2026 |
| Gist -A- O-10-1563 | Aghorn Operating, Inc. only | Foster | Ector | 37 | 1.92M | 565K | Jan 1993 – Jul 2026 |
| Foster, H. O-10-22457 | Occidental Permian Ltd. only | Cowden, South (Canyon 8790) | Ector | 8 | 1.78M | 1.36M | Jan 1993 – Jul 2026 |
| Foster, H. C. O-10-1538 | Aghorn Operating, Inc. only | Foster | Ector | 39 | 1.66M | 474K | Jan 1993 – Jul 2026 |
| Cowden, Elliott F., -A- O-10-1579 | Occidental Permian Ltd. only | Foster | Ector | 102 | 1.66M | 552K | Jan 1993 – Jul 2026 |
| Foster Gbsa Unit O-10-19371 | OXY USA Inc. only | Cowden, South | Ector | 131 | 1.48M | 585K | Jan 1993 – Jul 2026 |
| Foster, Tobe NCT-1 O-11-18908 | Bce-Mach III LLC only | D. E. B. (Wolfcamp) | Gaines | 11 | 1.42M | 275K | Jan 1993 – Jul 2026 |
| Foster, Tobe NCT-2 O-11-63318 | Bce-Mach III LLC only | D. E. B. (Wolfcamp) | Gaines | 15 | 1.38M | 292K | Jan 1993 – Jul 2026 |
| Cowden, Elliott F., -B- O-10-1580 | Occidental Permian Ltd. only | Foster | Ector | 56 | 1.34M | 419K | Jan 1993 – Jul 2026 |
| Bagley -A- O-10-1549 | OXY USA WTP LP only | Foster | Ector | 23 | 1.25M | 402K | Jan 1993 – Jul 2026 |
| Gist -C- O-10-1565 | Aghorn Operating, Inc. only | Foster | Ector | 16 | 1.04M | 320K | Jan 1993 – Jul 2026 |
| Beggs-Foster Waterflood Unit O-11-67118 | BKM Production only | Tumbleweed, NW. (Tannehill) | Dickens | 33 | 1.02M | 40.3K | Jul 1993 – Jul 2026 |
| Foster 8 O-10-37284 | OXY USA WTP LP only | Cowden, South (Canyon 8790) | Ector | 3 | 998K | 907K | Feb 2004 – Jul 2026 |
| Foster, W. L. #5 O-10-2911 | Bce-Mach III LLC only | Iatan, East Howard | Mitchell | 29 | 992K | 165K | Jan 1993 – Jul 2026 |
| Foster, Mary Acct. #2 O-10-12160 | Basa Resources, Inc. only | Iatan (San Andres) | Mitchell | 74 | 989K | 142K | Jan 1993 – Jul 2026 |
| Foster 4344 O-10-50598 | Civitas Permian Operating, LLC only | Spraberry (Trend Area) | Glasscock | 5 | 981K | 2.64M | Aug 2017 – Jul 2026 |
| Bagley, Vina O-10-1567 | Aghorn Operating, Inc. only | Foster | Ector | 20 | 904K | 240K | Jan 1993 – Jul 2026 |
| Brock, L. E. O-10-21471 | Laguna Petroleum Corporation only | Foster | Ector | 19 | 848K | 259K | Jan 1993 – Jul 2026 |
| Witcher, J. E. O-10-21414 | Laguna Petroleum Corporation only | Foster | Ector | 22 | 768K | 238K | Jan 1993 – Jul 2026 |
| Gist -B- O-10-1564 | Aghorn Operating, Inc. only | Foster | Ector | 22 | 718K | 159K | Jan 1993 – Jul 2026 |
| Foster-Pegues Unit O-10-22199 | Laguna Petroleum Corporation only | Foster | Ector | 23 | 709K | 229K | Jan 1993 – Jul 2026 |
| S. Foster Gbsa Unit O-10-19372 | OXY USA Inc. only | Cowden, South | Ector | 29 | 675K | 307K | Jan 1993 – Jul 2026 |
| Witcher, J. E. -A- O-10-1574 | Occidental Permian Ltd. only | Foster | Ector | 20 | 647K | 222K | Jan 1993 – Jul 2026 |
| Witcher, J. E. -C- O-10-1605 | Occidental Permian Ltd. only | Foster | Ector | 9 | 629K | 178K | Jan 1993 – Jul 2026 |
| Foster, F. O-10-1581 | Occidental Permian Ltd. only | Foster | Ector | 21 | 611K | 264K | Jan 1993 – Jul 2026 |
| Foster -D- O-10-1610 | Aghorn Operating, Inc. only | Foster | Ector | 32 | 584K | 300K | Jan 1993 – Jul 2026 |
| Foster, H. S. O-10-929 | Helms Oil & Gas, LLC only | Cowden, South | Ector | 25 | 577K | 409K | Jan 1993 – Jul 2026 |
| Johnson, J. L., Unit O-10-19081 | O'Ryan Oil and Gas only | Foster | Ector | 41 | 567K | 169K | Jan 1993 – Jul 2026 |
| Foster, -C- O-10-1561 | Aghorn Operating, Inc. only | Foster | Ector | 16 | 557K | 196K | Jan 1993 – Jul 2026 |
| Viper Foster D O-10-54788 | SM Energy Company only | Spraberry (Trend Area) | Howard | 1 | 543K | 1.09M | Jan 2020 – Jul 2026 |
| Foster, H. C. O-10-22782 | Laguna Petroleum Corporation only | Foster | Ector | 20 | 539K | 164K | Jan 1993 – Jul 2026 |
| Viper Foster C O-10-54787 | SM Energy Company only | Spraberry (Trend Area) | Howard | 1 | 522K | 906K | Mar 2020 – Jul 2026 |
| Bagley, J. E. O-10-1608 | Aghorn Operating, Inc. only | Foster | Ector | 7 | 517K | 114K | Jan 1993 – Jul 2026 |
| Witcher, J. E. -7- O-10-1558 | Occidental Permian Ltd. only | Foster | Ector | 15 | 514K | 125K | Jan 1993 – Jul 2026 |
| Viper Foster B O-10-54837 | SM Energy Company only | Spraberry (Trend Area) | Howard | 1 | 505K | 643K | Apr 2020 – Jul 2026 |
| Foster -AA- O-10-31466 | Occidental Permian Ltd. only | Cowden, South (Canyon 8900) | Ector | 1 | 493K | 882K | Jan 1993 – May 2022 |
| Johnson, Lyda Mae O-10-21686 | Momentum Energy Corporation only | Foster | Ector | 3 | 448K | 28.3K | Jan 1993 – Jul 2026 |
| Foster 8-5 O-10-37906 | OXY USA WTP LP only | Cowden, South (Canyon 8790) | Ector | 2 | 385K | 306K | Aug 2006 – Jul 2026 |
| Gist O-10-37443 | OXY USA WTP LP only | Foster (Wolfcamp-Baxter) | Ector | 1 | 378K | 212K | Oct 2004 – Jul 2026 |
| Witcher, J. E. -PA- O-10-1606 | Occidental Permian Ltd. only | Foster | Ector | 7 | 377K | 88.3K | Jan 1993 – Jul 2026 |
| Foster Petroleum Corp. O-11-5190 | Hilcorp Energy Company only | Russell, North (Devonian) | Gaines | 2 | 352K | 176K | Jan 1993 – Jul 2026 |