| Hamman 45 O-10-47339 | Permian Resources Operating, LLC only | Spraberry (Trend Area) | Midland | 13 | 3.47M | 8.22M | Aug 2016 – Apr 2026 |
| Davis, T. W. O-3-365 | Hamman Oil & Refining Company only | Big Creek | Fort Bend | 96 | 1.14M | 284K | by Jan 1993 – Apr 2026 |
| Hamman 45A Tig O-10-56963 | Permian Resources Operating, LLC only | Spraberry (Trend Area) | Midland | 4 | 788K | 1.78M | Apr 2022 – Apr 2026 |
| Hamman B O-13-32284 | Oakridge Oil and Gas, LP only | KRS (Marble Falls) | Jack | 20 | 467K | 6.95M | Apr 2012 – Apr 2026 |
| Hamman 30 O-9-19257 | Permian Resources Operating, LLC only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 392K | 757K | Aug 2016 – Apr 2026 |
| Davis O-3-25250 | Hamman Oil & Refining Company only | Big Creek | Fort Bend | 12 | 332K | 137K | Feb 2008 – Mar 2024 |
| Hamman 30A O-9-19454 | Permian Resources Operating, LLC only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 296K | 825K | Dec 2016 – Apr 2026 |
| Josey, L. O-3-12020 | Hamman Oil & Refining Company only | Josey Ranch (6450) | Harris | 4 | 251K | 524K | by Jan 1993 – Nov 2016 |
| Tank Farm O-10-36934 | Hamman Oil & Refining Company only | Spraberry (Trend Area) | Midland | 7 | 238K | 637K | Aug 2002 – Apr 2019 |
| Longenbaugh, A. G. O-3-12320 | Hamman Oil & Refining Company only | Cypress (Y-9) | Harris | 3 | 227K | 173K | by Jan 1993 – Jul 2014 |
| Hamman 30D O-9-20937 | Permian Resources Operating, LLC only | Spraberry (Trend Area) R 40 Exc | Upton | 2 | 221K | 865K | Mar 2021 – Apr 2026 |
| Hamman 30F O-9-21460 | Permian Resources Operating, LLC only | Spraberry (Trend Area) | Upton | 2 | 214K | 870K | Dec 2021 – Apr 2026 |
| Kasman G-3-222272 | Rap Operating, L.L.C. only | Hamman Deep (Frio 12,000) | Matagorda | 1 | 211K | 5.91M | Apr 2006 – Jan 2019 |
| Hamman 45 Tig O-10-56171 | Permian Resources Operating, LLC only | Spraberry (Trend Area) | Midland | 1 | 168K | 882K | Jun 2021 – Apr 2026 |
| Hamman Ranch G-4-189387 | Merit Energy Company only | Monte Christo, N(vicksburg T LO) | Hidalgo | 1 | 163K | 15.1M | Oct 2001 – Aug 2011 |
| Wilcox Heirs O-3-19292 | Hamman Oil & Refining Company only | Trinity River Delta (F-13) | Chambers | 2 | 137K | 274K | by Jan 1993 – Aug 2008 |
| Hammann-Nixon Unit O-3-21758 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Washington | 1 | 132K | 1.28M | by Jan 1993 – Apr 2026 |
| Hamman 30E O-9-20949 | Permian Resources Operating, LLC only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 127K | 445K | Mar 2021 – Apr 2026 |
| Hamman 30G O-9-21466 | Permian Resources Operating, LLC only | Spraberry (Trend Area) | Upton | 1 | 127K | 639K | Dec 2021 – Apr 2026 |
| Hamman 30B O-9-20911 | Permian Resources Operating, LLC only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 127K | 345K | Mar 2021 – Apr 2026 |
| Hamman Ranch G-4-183253 | Merit Energy Company only | Monte Christo, N(vicksburg T LO) | Hidalgo | 1 | 123K | 6.38M | Jan 2001 – Jun 2004 |
| Longenbaugh Josey Unit O-3-24771 | Hamman Oil & Refining Company only | Cypress (Y-9) | Harris | 1 | 115K | 5.64K | Oct 2005 – Aug 2019 |
| Hamman Ranch G-4-180796 | Merit Energy Company only | Monte Christo, N. (Vicksburg T) | Hidalgo | 1 | 114K | 20.3M | Dec 2000 – Sep 2020 |
| Bryan, E. Fee O-3-25780 | Hamman Oil & Refining Company only | Big Creek | Fort Bend | 16 | 112K | 30.1K | May 2012 – Apr 2026 |
| Hamman 30C O-9-20912 | Permian Resources Operating, LLC only | Spraberry (Trend Area) R 40 Exc | Upton | 1 | 112K | 393K | Mar 2021 – Apr 2026 |
| Hamman G-3-192569 | Eqv Operating LLC only | Sunflower (Upper Woodbine) | Polk | 1 | 106K | 14.4M | Oct 2002 – Sep 2016 |
| Hamman Ranch G-4-170477 | Merit Energy Company only | Monte Christo (Vksbg KK) | Hidalgo | 1 | 99.7K | 4.45M | Sep 1998 – Feb 2009 |
| Longenbaugh, A.G. O-3-24791 | Hamman Oil & Refining Company only | Cypress (Y-6) | Harris | 1 | 76.3K | 2.41K | Dec 2005 – Mar 2018 |
| Krenek, Frank G-3-195280 | Hamman Oil & Refining Company only | Cooley (Meek Sand) | Fort Bend | 1 | 70.3K | 2.34M | May 2003 – Apr 2008 |
| Bright & Schiff Hamman Gas Unit G-4-148684 | Merit Energy Company only | Monte Christo (Vksbg-Brown) | Hidalgo | 1 | 68.7K | 3.74M | Mar 1994 – Apr 2026 |
| Hamman O-13-32157 | Oakridge Oil and Gas, LP only | KRS (Marble Falls) | Jack | 7 | 68K | 1.97M | Mar 2012 – Apr 2021 |
| Milberger Gas Unit G-3-210822 | Rap Operating, L.L.C. only | Hamman, East (10,870) | Matagorda | 1 | 66.2K | 1.92M | Jun 2005 – Jan 2023 |
| Milberger Gas Unit G-3-211023 | South Bay Resources, L.L.C. only | Hamman, East (11,200 Frio) | Matagorda | 1 | 62.5K | 1.32M | Aug 2005 – May 2013 |
| Hamman Ranch G-4-183322 | Merit Energy Company only | Monte Christo, N. (Vicksburg T) | Hidalgo | 1 | 60.6K | 19.6M | May 2001 – May 2015 |
| Hamman Ranch G-4-186386 | Merit Energy Company only | Monte Christo, N. (Vicksburg T) | Hidalgo | 1 | 59.5K | 8.72M | Aug 2001 – Nov 2004 |
| Alexander-Odc O-14-3199 | Hamman Oil & Refining Company only | Clementine (Morrow, Upper) | Hansford | 2 | 54.5K | 494K | by Jan 1993 – Apr 2020 |
| Talafuse G-3-212241 | South Bay Resources, L.L.C. only | Hamman, East (11,200 Frio) | Matagorda | 1 | 53.8K | 1.5M | Nov 2005 – Dec 2011 |
| Slone, L. M. O-3-1856 | Rusk Energy Operating LLC only | Hamman | Matagorda | 3 | 53.5K | 41 | by Jan 1993 – Apr 2026 |
| Frank Krenek Unit O-3-25289 | Hamman Oil & Refining Company only | Cooley (Wilcox, Upper) | Fort Bend | 1 | 46.7K | 139K | Jun 2008 – Nov 2016 |
| Hamman Ranch G-4-155445 | Merit Energy Company only | Monte Christo (Vksbg KK) | Hidalgo | 1 | 43.2K | 7.72M | Sep 1995 – Mar 2009 |
| Milberger, F. J. G-3-222480 | Rap Operating, L.L.C. only | Hamman, East (11,200 Frio) | Matagorda | 1 | 43.2K | 1.51M | Aug 2006 – Jan 2022 |
| Arnold Heirs G-3-223833 | Houston Energy, L.P. only | Hamman, East ( Richer) | Matagorda | 1 | 41.9K | 1.07M | Feb 2007 – Dec 2009 |
| Goolsbee G-3-234911 | Rap Operating, L.L.C. only | Hamman, East (11,200 Frio) | Matagorda | 1 | 39.5K | 946K | Sep 2007 – Jan 2023 |
| Longenbaugh O-3-24450 | Hamman Oil & Refining Company only | Cypress (Y-6) | Harris | 2 | 37.5K | 42.5K | Nov 2003 – Aug 2005 |
| Miller, L. H. Gas Unit G-3-151805 | Hamman Oil & Refining Company only | Jennings Lake (Frio 9500) | Matagorda | 1 | 37.3K | 825K | Dec 1994 – Nov 1997 |
| Hamman, John "B" G-4-114104 | Hilcorp Energy Company only | Monte Christo (Vksbg GG) | Hidalgo | 1 | 34.2K | 3.8M | by Jan 1993 – Apr 2026 |
| Talafuse Gas Unit G-3-254779 | Amrwr, LLC only | Hamman, East (11,200 Frio FB B) | Matagorda | 1 | 34.2K | 755K | Jun 2008 – Jan 2023 |
| Cleveland, May O-3-1852 | Rusk Energy Operating LLC only | Hamman | Matagorda | 4 | 33.7K | 41 | by Jan 1993 – Apr 2026 |
| Hamman B O-13-34382 | Oakridge Oil and Gas, LP only | Bryson, East | Jack | 4 | 33.6K | 3.62K | Feb 2025 – Apr 2026 |
| Longenbaugh Unit O-3-24497 | Hamman Oil & Refining Company only | Cypress (Y-6) | Harris | 1 | 32.9K | 18.8K | Jan 2004 – Aug 2005 |