| North Cowden Unit O-10-20164 | Occidental Permian Ltd. only | Cowden, North | Ector | 1,651 | 99.7M | 44.2M | Jan 1993 – Apr 2026 |
| East Cowden (Grayburg) Unit O-10-22927 | Basin Oil & Gas Operating, LLC only | Cowden, North | Ector | 92 | 10.4M | 3.6M | Jan 1993 – Apr 2026 |
| Rhodes Cowden Unit O-10-20538 | OXY USA WTP LP only | Cowden, North | Ector | 170 | 8.15M | 6.14M | Jan 1993 – Apr 2026 |
| Corrigan Cowden Unit O-10-24118 | OXY USA Inc. only | Cowden, North | Ector | 56 | 6.42M | 1.79M | Jan 1993 – Apr 2026 |
| Holt, O. B. /R/ O-10-797 | Occidental Permian Ltd. only | Cowden, North | Ector | 34 | 3.15M | 1.15M | Jan 1993 – Apr 2026 |
| Holt, O. B. O-10-23396 | Texland Petroleum, L.P. only | Cowden, North | Ector | 134 | 2.08M | 705K | Jan 1993 – Apr 2026 |
| Woods, E. N. O-10-737 | OXY USA Inc. only | Cowden, North | Ector | 27 | 1.79M | 378K | Jan 1993 – Apr 2026 |
| Henry Cowden (Gbsa)unit O-10-36084 | Extex Operating Company only | Cowden, North | Andrews | 30 | 1.53M | 312K | Oct 1999 – Apr 2026 |
| Barrow, Augusta O-10-14687 | Formentera Operations LLC only | Cowden, North | Ector | 16 | 1.45M | 69.9K | Jan 1993 – Nov 2025 |
| Holt, O. B. /S/ O-10-798 | Occidental Permian Ltd. only | Cowden, North | Andrews | 29 | 1.41M | 501K | Jan 1993 – Apr 2026 |
| Wight Unit O-10-20661 | United Oil & Shale LLC only | Cowden, North | Ector | 159 | 1.15M | 1.44M | Jan 1993 – Apr 2026 |
| Ratliff O-10-14262 | R3 Operating Corporation only | Cowden, North | Ector | 38 | 552K | 33.6K | Jan 1993 – Apr 2026 |
| Fasken, David -CH- O-10-28929 | Occidental Permian Ltd. only | Cowden, North | Andrews | 13 | 540K | 314K | Jan 1993 – Apr 2026 |
| Block 9 Unit O-10-20417 | Formentera Operations LLC only | Cowden, North | Andrews | 23 | 514K | 64.8K | Jan 1993 – Apr 2026 |
| 7814 JV-P Cran O-10-25322 | Libertad Operating LLC only | Cowden, North | Ector | 7 | 505K | 28.7K | Jan 1993 – Mar 2026 |
| State University -BN- O-10-14249 | Extex Operating Company only | Cowden, North | Andrews | 7 | 499K | 58.9K | Jan 1993 – Apr 2026 |
| Holt, O. B., -H- O-10-16153 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Andrews | 6 | 423K | 140K | Jan 1993 – Apr 2026 |
| Holt, O.B. Grbg O-10-20398 | Olsen Energy Inc. only | Cowden, North | Andrews | 97 | 386K | 57.4K | Jan 1993 – Apr 2026 |
| Cowden, Frank R/a -D- O-10-25977 | Occidental Permian Ltd. only | Cowden, North | Andrews | 12 | 268K | 101K | Jan 1993 – Apr 2026 |
| TXL O-10-25455 | Formentera Operations LLC only | Cowden, North | Ector | 7 | 256K | 520K | Jan 1993 – Apr 2026 |
| Fee "AH" O-10-36973 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Ector | 3 | 223K | 13.3K | Nov 2002 – Apr 2026 |
| TXL -G- O-10-25740 | Highmark Energy Operating, LLC only | Cowden, North | Ector | 4 | 206K | 281K | Jan 1993 – Apr 2026 |
| Wight, Mrs. L. E. "4" O-10-23778 | United Oil & Shale LLC only | Cowden, North | Ector | 9 | 205K | 67.4K | Jan 1993 – Apr 2026 |
| Cabot-University O-10-13178 | Kenworthy Oil Company only | Cowden, North | Andrews | 3 | 187K | 3.87K | Jan 1993 – Feb 2026 |
| Exxon-University O-10-35934 | North Fork Operating LP only | Cowden, North | Andrews | 5 | 179K | 14.9K | Dec 1998 – Apr 2026 |
| University -D- O-10-16304 | Libertad Operating LLC only | Cowden, North | Andrews | 3 | 162K | 21.5K | Jan 1993 – Mar 2026 |
| Holt, O. B. O-10-722 | Olsen Energy Inc. only | Cowden, North | Andrews | 12 | 139K | 16.7K | Jan 1993 – Apr 2026 |
| Cowden, Frank R/a -T- O-10-25997 | Occidental Permian Ltd. only | Cowden, North | Andrews | 9 | 136K | 115K | Jan 1993 – Apr 2026 |
| Wight -A-19- O-10-25690 | United Oil & Shale LLC only | Cowden, North | Ector | 3 | 134K | 1.01M | Jan 1993 – Jul 2019 |
| Holt, O. B. O-10-807 | Texland Petroleum, L.P. only | Cowden, North | Ector | 1 | 131K | 17.3K | Jan 1994 – Apr 2026 |
| Fee -ZB- O-10-29318 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Andrews | 4 | 129K | 98.6K | Jan 1993 – Apr 2026 |
| Sun-University O-10-32628 | Henry Petroleum Corp. only | Cowden, North | Andrews | 6 | 128K | 12.8K | Jan 1993 – Sep 1999 |
| Midland Farms -AA- O-10-30032 | Occidental Permian Ltd. only | Cowden, North | Ector | 2 | 121K | 81.6K | Jan 1993 – Sep 2021 |
| Smith O-10-14275 | Kenworthy Oil Company only | Cowden, North | Ector | 5 | 117K | 30 | Jan 1993 – Feb 2026 |
| Atlantic-Holt O-10-13461 | Kenworthy Oil Company only | Cowden, North | Andrews | 5 | 111K | 11.9K | Jan 1993 – Feb 2026 |
| State University -FE- O-10-29302 | Henry Petroleum Corp. only | Cowden, North | Andrews | 2 | 105K | 35K | Jan 1993 – Sep 1999 |
| Toad O-10-32060 | Texland Petroleum, L.P. only | Cowden, North | Ector | 8 | 103K | 55.6K | Jan 1993 – Apr 2026 |
| Texas University -H- O-10-16835 | Henry Petroleum Corp. only | Cowden, North | Andrews | 5 | 103K | 6.61K | Jan 1993 – Sep 1999 |
| Midland Farms O-10-716 | Aghorn Operating, Inc. only | Cowden, North | Ector | 13 | 100K | 70.6K | Jan 1993 – Sep 2019 |
| University -DQ- O-10-14797 | Olsen Energy Inc. only | Cowden, North | Andrews | 3 | 98.1K | 31 | Jan 1993 – Apr 2026 |
| Cowden "A",w.f. O-10-28470 | Occidental Permian Ltd. only | Cowden, North | Ector | 5 | 95.8K | 20.4K | Jan 1993 – Apr 2026 |
| Barrow O-10-23019 | Baker Operating, Inc. only | Cowden, North | Ector | 5 | 92.9K | 21 | Jan 1993 – Apr 2026 |
| D. K. M. O-10-14416 | Libertad Operating LLC only | Cowden, North | Ector | 2 | 91K | 9.97K | Jan 1993 – Mar 2026 |
| Cowden, Frank R/a -A- O-10-32884 | Occidental Permian Ltd. only | Cowden, North | Andrews | 1 | 87.5K | 6.58K | Jan 1993 – Apr 2019 |
| Fee "ZF" O-10-29636 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Ector | 1 | 83.8K | 38.9K | Jan 1993 – Mar 2026 |
| TXL -A- O-10-26234 | Baker Operating, Inc. only | Cowden, North | Ector | 2 | 82.8K | 201K | Jan 1993 – Apr 2026 |
| Toad -A- O-10-32736 | Texland Petroleum, L.P. only | Cowden, North | Ector | 4 | 73.2K | 20.1K | Jan 1993 – Aug 2022 |
| Holt, O. B. Tract 3 O-10-36877 | Kenworthy Oil Company only | Cowden, North | Andrews | 1 | 68.7K | 2.88K | Apr 2002 – Feb 2026 |
| Blakeney, B.H. -A- O-10-25062 | Occidental Permian Ltd. only | Cowden, North | Ector | 1 | 65.6K | 160K | Jan 1993 – Dec 2024 |
| 7814 JV-P Hence O-10-25341 | BTA Oil Producers, LLC only | Cowden, North | Ector | 6 | 64.3K | 20.1K | Jan 1993 – Feb 2016 |