| State Tract 216 O-2-6058 | Torrent Oil LLC only | Grass Island (Farwell -A-) | Calhoun | 4 | 664K | 241K | Jan 1993 – Apr 2026 |
| State Tract 216 O-2-6506 | Torrent Oil LLC only | Grass Island (Matagorda -A-) | Calhoun | 8 | 632K | 494K | Jan 1993 – Apr 2026 |
| State Tract 216 O-2-5707 | Torrent Oil LLC only | Grass Island (Farwell -M-) | Calhoun | 4 | 572K | 413K | Jan 1993 – Apr 2026 |
| BP Chemicals O-2-8709 | Royal Production Company, Inc. only | Guajolote Suerte (5750) | Calhoun | 2 | 465K | 395K | Mar 2002 – Apr 2026 |
| P.W.L.R. O-2-8703 | Royal Production Company, Inc. only | Guajolote Suerte (5750) | Calhoun | 4 | 460K | 909K | Mar 2002 – Apr 2026 |
| Welder B O-2-6081 | B&L Resources, L.L.C. only | Katie Welder (L-1) | Calhoun | 8 | 444K | 552K | Jan 1993 – Mar 2016 |
| Dunwoody, Charles O-2-691 | McGowan Working Partners, Inc. only | Heyser | Calhoun | 4 | 416K | 228K | Jan 1993 – Apr 2026 |
| State Tract 216 O-2-6568 | Torrent Oil LLC only | Grass Island (4220) | Calhoun | 4 | 399K | 377K | Jan 1993 – Sep 2025 |
| State Tract 99 O-2-4219 | TR Offshore, LLC only | Mosquito Point (Frio I) | Calhoun | 3 | 341K | 563K | Sep 1994 – May 2025 |
| State of Texas #33724 O-2-1271 | Bep Operating, LLC only | Powderhorn (5200 Sand) | Calhoun | 6 | 293K | 214K | Jan 1993 – Nov 2015 |
| Traylor, Maude B. O-2-3004 | Silverbrook Operating, LLC only | Maude B. Traylor, E. (Melbourne) | Calhoun | 4 | 276K | 423K | Feb 1997 – Apr 2026 |
| Brooking, M.T. O-2-7458 | Corum Production Company only | Southern Comfort (Frio 9100) | Calhoun | 1 | 268K | 980K | Jan 1993 – Oct 1999 |
| Texas State Tract 117 G-2-138507 | Vintage Petroleum, Inc. only | Panther Reef, SW. (Frio G-1) | Calhoun | 1 | 244K | 4.37M | Jan 1993 – Sep 1999 |
| Welder O-2-11598 | B&L Resources, L.L.C. only | Heyser (5400 #3) | Calhoun | 4 | 213K | 2.51M | Jul 2018 – Mar 2026 |
| State Tract 216 O-2-7049 | Torrent Oil LLC only | Grass Island (4870) | Calhoun | 2 | 189K | 150K | Jan 1993 – Apr 2026 |
| Hahn O-2-8795 | Kebo Oil & Gas, Inc. only | Long Mott, East (7450) | Calhoun | 3 | 175K | 423K | Jan 2003 – Apr 2026 |
| Cook, J.G. O-2-7499 | Baylor Operating, LLC only | Heyser | Calhoun | 2 | 132K | 138K | Jan 1993 – Oct 2019 |
| Cox Bay State Tract No. 59 G-2-128647 | Remora Operating, LLC only | Maude B. Traylor (F-41-61, Deep) | Calhoun | 1 | 132K | 3.52M | Jan 1993 – Sep 2020 |
| Brooking, M.M. G-2-135003 | Silverbrook Operating, LLC only | Southern Comfort (Frio) | Calhoun | 1 | 118K | 1.36M | Jan 1993 – Mar 2026 |
| State of Texas 33724 O-2-8241 | XOG Operating LLC only | Powderhorn (4 North) | Calhoun | 1 | 112K | 148K | Jan 1997 – Aug 2005 |
| Welder, Patrick H. O-2-6463 | Finaly Resources LLC only | Barge Canal (Frio 5940) | Calhoun | 1 | 109K | 414K | Jan 1993 – Feb 2026 |
| Traylor, Maude B. Mrs. G-2-119772 | Remora Operating, LLC only | Maude B. Traylor (F-41-61, Deep) | Calhoun | 1 | 106K | 2.7M | Jan 1993 – Jan 2013 |
| Bennett, W. H. O-2-703 | McGowan Working Partners, Inc. only | Heyser | Calhoun | 3 | 102K | 318K | Jan 1993 – Apr 2026 |
| Brooking, M. T. O-2-8608 | Silverbrook Operating II LLC only | Southern Comfort (Frio 9100) | Calhoun | 1 | 101K | 66.7K | Jun 2000 – Feb 2017 |
| Bull Redfish Unit G-2-266900 | Lamar Oil & Gas, Inc. only | Panther Reef (Frio Cons.) | Calhoun | 1 | 99.4K | 2.84M | Mar 2012 – May 2025 |
| Traylor, Maude A G-2-225770 | Remora Operating, LLC only | Maude B. Traylor (F-41-61, Deep) | Calhoun | 1 | 98.1K | 3.82M | Dec 2006 – Jul 2021 |
| Welder, E.H. Mrs. O-2-8266 | B&L Resources, L.L.C. only | Heyser (5400) | Calhoun | 1 | 96.6K | 58.5K | Aug 1996 – Jan 2005 |
| Aluminum Company of America Fee G-2-113423 | Neumin Production Company only | Lavaca Bay (F-40-B) | Calhoun | 1 | 95.5K | 7.32M | Jan 1993 – Apr 2020 |
| Matagorda Bay S.T. 150 G-2-179901 | Sonterra Operating, Inc. only | Matagorda Bay (Bol Mex) | Calhoun | 1 | 95.4K | 2.43M | Nov 2001 – Jan 2009 |
| Dow Powderhorn Ranch-Edc O-2-6426 | Pitco Investments, Ltd. only | Powderhorn,s.w.(frio 10700) | Calhoun | 1 | 91.9K | 297K | Apr 1993 – Feb 2006 |
| Sheriff Greta O-2-3337 | Initial Energy Services, LLC only | Sheriff (5700 Greta Sand) | Calhoun | 5 | 91.2K | 181K | Jan 1993 – Jan 2015 |
| Cook, J. G. O-2-3186 | Baylor Operating, LLC only | Heyser (5400 #3) | Calhoun | 2 | 90.1K | 70.6K | Mar 1993 – Oct 2019 |
| Traylor, Maude B. G-2-147633 | Wagner Oil Company only | Maude B. Traylor (F-41-61, Deep) | Calhoun | 1 | 90K | 2.15M | Nov 1993 – Feb 2017 |
| State Tract #59 O-2-3900 | Gulf E&P Ltd only | Zoller, S. (Frio G-3) | Calhoun | 1 | 88.8K | 126K | Jan 1993 – May 2016 |
| Dunwoody, Charles O-2-8146 | McGowan Working Partners, Inc. only | Heyser (5400 #3) | Calhoun | 1 | 87.3K | 258K | Mar 1996 – Aug 2024 |
| Bennett O-2-7921 | McGowan Working Partners only | Heyser (7030) | Calhoun | 1 | 86.3K | 107K | Nov 1993 – Mar 1998 |
| Quail Ridge/State Unit G-2-275993 | Neumin Production Company only | Lavaca Bay (F-46) | Calhoun | 1 | 83.8K | 1.63M | Nov 2013 – May 2018 |
| Traylor, Maude B. "B" G-2-233750 | Angel Operating LLC only | Maude B. Traylor (F-41-61, Deep) | Calhoun | 1 | 81.2K | 2.41M | Jan 2008 – Jun 2023 |
| Gallinipper Unit G-2-244784 | Neumin Production Company only | Lavaca Bay (F-44) | Calhoun | 1 | 81.1K | 2.45M | Jan 2007 – Aug 2017 |
| Maude B. Traylor "B" G-2-237664 | Angel Operating LLC only | Maude B. Traylor (F-41-61, Deep) | Calhoun | 1 | 79.3K | 2.69M | May 2008 – Jun 2023 |
| Bennett, W. H. O-2-7419 | McGowan Working Partners, Inc. only | Heyser (5400 #3) | Calhoun | 1 | 78.1K | 86.3K | May 2004 – Apr 2026 |
| State Tract 254 G-2-217956 | Columbus Energy, LLC only | Appling Deep, SW (Frio) | Calhoun | 1 | 76.5K | 989K | Aug 2005 – Feb 2019 |
| Gallinipper Unit G-2-250031 | Neumin Production Company only | Lavaca Bay (F-43) | Calhoun | 1 | 75.7K | 1.25M | Oct 2006 – Aug 2017 |
| Quail Ridge/State Unit G-2-267712 | Neumin Production Company only | Lavaca Bay (F-46) | Calhoun | 1 | 74.7K | 1.55M | Apr 2012 – Jun 2016 |
| State of Texas 33724 O-2-6607 | Apache Corporation only | Powderhorn (4 North) | Calhoun | 2 | 71.5K | 56.1K | Jan 1993 – Oct 1994 |
| McDonald-Hahn G-2-193275 | C & E Operating, Inc. only | Long Mott (7800) | Calhoun | 1 | 67.8K | 479K | Jan 2003 – May 2007 |
| Traylor, Maude B. G-2-129631 | Angel Operating LLC only | Maude B. Traylor, North (43) | Calhoun | 1 | 66.5K | 1.53M | Jan 1993 – May 2014 |
| Welder M O-2-12460 | B&L Resources, L.L.C. only | Heyser (5400 #2) | Calhoun | 1 | 65.8K | 129K | Mar 2022 – Mar 2026 |
| Gallinipper Unit O-2-9120 | Neumin Production Company only | Lavaca Bay (F-37) | Calhoun | 1 | 65.5K | 1.02M | May 2006 – Jun 2007 |
| Powderhorn Company O-2-8668 | Bep Operating, LLC only | Powderhorn (4 Sand) | Calhoun | 1 | 62.1K | 139K | Aug 2001 – Nov 2015 |