| Wardner, G.P. O-4-12618 | Urban Oil & Gas Group, LLC | Stratton (Consolidated) | 52 | 855K | 6.61M | May 1996 – Jul 2026 |
| State Tract 904 Gas Unit O-4-13087 | TR Offshore, LLC | G.O.M. St 904 (MT2 FB-B) | 1 | 795K | 1.9M | May 2002 – Jul 2026 |
| State Tract 322 O-4-10610 | Lamar Oil & Gas, Inc. | Stedman Island (8120 Frio) | 3 | 552K | 755K | Jan 1993 – Apr 2008 |
| State Tract 348 O-4-12539 | Cinco Natural Resources Corp. | Red Fish Bay (Zone 5-B) | 1 | 352K | 259K | Mar 1996 – Jul 2026 |
| Chapman O-4-12700 | Geiser Operating, Inc. | Arnold-David, North (Hight Sand) | 2 | 277K | 198K | Sep 1997 – Sep 2019 |
| Gruene, O. A. O-4-10049 | Apache Corporation | Stratton (G-29-3) | 1 | 256K | 285K | Jan 1993 – Mar 2008 |
| Thompson, J.A. O-4-12599 | Sue-Ann Operating, L.C. | Riverside (4910) | 1 | 227K | 172K | Jul 1996 – Jul 2026 |
| London, Ollie O-4-1603 | CG Technical Operating Co, LLC | London Gin (Mass. Catahoula) | 6 | 210K | 70 | Jan 1993 – Jul 2026 |
| Dugger, L. M. O-4-12698 | Rincon Petroleum Corporation | Minnie Bock, N. (Upper Bertram) | 1 | 209K | 248K | Jun 1997 – Feb 2006 |
| Guaranty Title & Trust O-4-12981 | Pine Island Operating, L.L.C. | Saxet, Deep (8200) | 1 | 194K | 206K | Aug 2000 – Jul 2026 |
| London, Dorothy O-4-12286 | Jubilee Resources, Ltd. | Doughty (Frio 6735) | 1 | 182K | 177K | Dec 1993 – Jul 2026 |
| Lowry-Hill O-4-13736 | Dewbre Petroleum Corporation | Bishop, West (King) | 2 | 180K | 81.9K | Jul 2012 – Jul 2026 |
| Chapman O-4-13410 | Sun Exploration, Inc. | Chapman Ranch (Upper Frio Cons.) | 6 | 177K | 22.3K | Nov 2006 – Jul 2026 |
| Miller, Nettie O-4-12610 | Charro Operating, L.L.C. | Cotton (Frio 7450) | 2 | 176K | 93.8K | Jun 1996 – Aug 2008 |
| Cowels O-4-12485 | Green Exploration Company | Arnold-David, North (Lindsey) | 1 | 175K | 167K | Jun 1995 – Jul 2026 |
| Driscoll, Clara O-4-5486 | Urban Oil & Gas Group, LLC | Agua Dulce (7050) | 2 | 163K | 370K | Jan 1993 – Jul 2026 |
| State Tract 973 O-4-3287 | Green Exploration Company | White Point, East | 4 | 152K | 86.5K | Jan 1993 – Jul 2026 |
| State Tract 470 O-4-12491 | Chaparral Energy, L.L.C. | Mustang Island, W. ( 5-a Sd.) | 1 | 151K | 392K | Aug 1995 – Jul 2013 |
| State Tract 706 O-4-13576 | Lamar Oil & Gas, Inc. | Nueces Bay (11220) | 1 | 150K | 516K | Oct 2009 – Jul 2026 |
| Elliff, J. S. Etal O-4-13012 | Urban Oil & Gas Group, LLC | Agua Dulce (Consolidated Frio) | 5 | 148K | 1.01M | Mar 2001 – Jul 2026 |
| Perkins-Lagasse O-4-13587 | Basin Oil & Gas Operating, LLC | Saxet ( 5,700 Frio) | 1 | 144K | 217K | Jun 2009 – Jun 2025 |
| Dugger O-4-13083 | KRC Operating, LLC | Minnie Bock, N. (Bertram Sand) | 1 | 143K | 333K | May 2002 – Mar 2025 |
| Chapman O-4-13104 | Ventex Operating Corp. | Arnold-David, North (Hight Sand) | 3 | 141K | 0 | Aug 2002 – Dec 2024 |
| Chapman O-4-12508 | Geiser Operating, Inc. | Arnold-David, North (Lindsey) | 3 | 136K | 265K | Nov 1995 – Sep 2019 |
| McCampbell, W. B. O-4-3225 | XOG Operating LLC | Turkey Creek (4000 Sand) | 4 | 133K | 125K | Jan 1993 – Jul 2026 |
| Hrncir, et al Unit O-4-14216 | Suemaur Operating LLC | Agua Dulce (Bluntzer) | 2 | 133K | 151K | Jan 2023 – Jul 2026 |
| Dugger O-4-12481 | KRC Operating, LLC | Minnie Bock, NE. (6950 Sand) | 5 | 126K | 209K | Aug 1995 – Aug 2022 |
| State Tract 470 O-4-12545 | Chaparral Energy, L.L.C. | Mustang Island, W. (6-B Sd.) | 1 | 115K | 222K | Feb 1996 – Jan 2011 |
| Walker, Ida O-4-13496 | Durango Resources Corp. | Richard King (Frio Cons.) | 3 | 113K | 15.8K | Nov 2008 – Jul 2026 |
| Cooke, C. N. Unit O-4-12293 | Opex Energy, LLC | Doughty (Frio 8590) | 1 | 109K | 139K | Dec 1993 – Jan 2007 |
| Miller "B" O-4-12185 | Silver Fox Oil & Gas LLC | Riverside, East (6200) | 2 | 107K | 180K | Apr 1993 – Jul 2026 |
| State Tract 348 O-4-13555 | Cinco Natural Resources Corp. | Red Fish Bay (Zone 5-A) | 1 | 106K | 176K | Feb 2009 – Jul 2026 |
| Chapman JO D O-4-13547 | Decker Operating Co., L.L.C. | Chapman Ranch (Upper Frio Cons.) | 1 | 101K | 18.9K | Nov 2006 – Jul 2026 |
| Taylor, R.E. O-4-11608 | Situs Oil & Gas, LLC | Clara Driscoll, South (5000) | 4 | 100K | 1.29K | Jan 1993 – Jul 2026 |
| Bliss, F. E. O-4-10271 | Petro Resources, Inc. | Saxet | 1 | 99.2K | 30.8K | Jan 1993 – Jan 2008 |
| Gee, H. W. O-4-12484 | Little, Lou Operating Co., Inc. | Agua Dulce (Coover) | 2 | 92.3K | 271K | Jul 1995 – Jul 2004 |
| Herrman-Liska Unit O-4-13433 | Britanco, L.L.C. | Agua Dulce (Consolidated Frio) | 2 | 90.4K | 327K | Apr 2007 – Jul 2026 |
| State Tract 470 O-4-11888 | Bristol Resources Corporation | Mustang Island, W.(20 Sd.) | 2 | 89.8K | 240K | Jan 1993 – Apr 1996 |
| Cooke, C. N. O-4-1588 | Jubilee Resources, Ltd. | London Gin | 2 | 88.8K | 271 | Jan 1993 – Jul 2026 |
| Isensee O-4-13612 | Great Western Drilling Company | Saxet ( Frio) | 1 | 88.2K | 43.7K | Jun 2010 – Mar 2021 |
| Erigan-Quiroz O-4-13033 | Anderson Oil Ltd. | Saxet ( 5,900 Frio) | 1 | 87.4K | 83.6K | Jun 2001 – Jun 2009 |
| Horne O-4-12540 | Sue-Ann Operating, L.C. | London Gin (4704) | 2 | 86.5K | 0 | Feb 1996 – Jul 2026 |
| Flinn, F.E. O-4-11325 | Dewbre Petroleum Corporation | Clara Driscoll, S. (5040) | 2 | 86.3K | 21 | Jan 1993 – Jul 2026 |
| State Tract 308 O-4-12640 | Cabot Oil & Gas Corporation | Stedman Island (8120 Frio) | 1 | 85K | 776K | Jan 1997 – May 2017 |
| Butts, J.B. O-4-11536 | Apache Corporation | Stratton (F-31-9) | 2 | 83.4K | 88K | Jan 1993 – Dec 2010 |
| State Tract 683 O-4-9905 | Southcoast Production Inc | Nueces Bay, W. (4600) | 3 | 82.7K | 113K | Jan 1993 – Jul 2026 |
| Horne O-4-10770 | Sue-Ann Operating, L.C. | London, West (Frio-Horne) | 2 | 80.4K | 24 | Jan 1993 – Jul 2014 |
| Prochaska O-4-13393 | Britanco, L.L.C. | Gyp Hill (Finley Sand) | 1 | 79.2K | 759 | Sep 2005 – Jul 2026 |
| Bernsen O-4-12991 | Hugoton Operating Company, Inc. | Clara Driscoll, South (6500) | 1 | 78.6K | 101K | Feb 2001 – Jul 2026 |
| Schubert O-4-11081 | Kebo Oil & Gas, Inc. | Agua Dulce (6350 Sd.) | 1 | 78.5K | 7.79K | Jan 1993 – Jul 2026 |