| Slough B O-3-27633 | Wildfire Energy Operating LLC only | Giddings (Eagleford) | Brazos | 2 | 495K | 230K | Jul 2019 – Jul 2026 |
| Acom -A- O-3-24784 | Gcows Operating LLC only | Willow Slough,n.(nodosaria 9500) | Chambers | 1 | 287K | 778K | Oct 2005 – Sep 2024 |
| Red Slough Unit O-3-24611 | Wildfire Energy Operating LLC only | Giddings (Buda) | Brazos | 1 | 248K | 179K | Jun 2004 – Jul 2026 |
| Mooring Slough Unit EB O-3-27168 | Wildfire Energy Operating LLC only | Giddings (Eagleford) | Robertson | 2 | 211K | 102K | Jan 2017 – Jul 2026 |
| White, William C. et Al O-3-23750 | McGowan Working Partners, Inc. only | Willow Slough,n.(nodosaria 9500) | Chambers | 1 | 137K | 130K | Dec 1999 – Oct 2025 |
| Mixson Land Company O-3-24969 | Whitehead Resources, Ltd. only | Gum Slough (Yegua) | Jasper | 2 | 131K | 33 | Feb 2007 – Aug 2026 |
| Pavlik O-3-22613 | Chevron Midcontinent, L.P. only | Mott Slough (Yegua 7150) | Wharton | 1 | 79.1K | 525K | Sep 1994 – Jul 2007 |
| Tanton O-3-23382 | Omega Energy Corp. only | Maple Slough (Wilcox 10000) | Hardin | 1 | 64.6K | 299K | Nov 1997 – Oct 2010 |
| D J Unit A O-3-19428 | Fusion XP, Inc. only | Maple Slough (Upper Wilcox, Oil) | Hardin | 1 | 44.5K | 177K | by Jan 1993 – Apr 2010 |
| Tytex O-3-23032 | Rutherford Oil Corporation only | Willow Slough,n.(nodosaria 9500) | Chambers | 1 | 44.4K | 52.7K | Jul 1996 – Dec 1998 |
| D J Unit C O-3-19513 | Reichmann Petroleum Corp. only | Maple Slough (Upper Wilcox, Oil) | Hardin | 1 | 39.2K | 186K | by Jan 1993 – Jul 2001 |
| Lewis, J. C. O-3-6349 | Expro Engineering, Inc. only | Duncan Slough (Frio-4) | Matagorda | 2 | 30.6K | 156K | by Jan 1993 – Mar 2001 |
| Barrow Unit O-3-22997 | Kerr-McGee Corporation only | Willow Slough (Sbz. a-1 Down) | Chambers | 1 | 27.7K | 6.85K | May 1996 – Nov 1998 |
| Arco Fee O-3-19446 | Dogwood Operating Company, Inc. only | Maple Slough (Upper Wilcox, Oil) | Hardin | 1 | 19.1K | 91.3K | by Jan 1993 – Apr 2010 |
| Lewis, J. C. O-3-21941 | Expro Engineering, Inc. only | Duncan Slough (Frio-3) | Matagorda | 1 | 17.9K | 241K | by Jan 1993 – Sep 2006 |
| Lewis, J. C. O-3-6350 | Expro Engineering, Inc. only | Duncan Slough (Frio-5) | Matagorda | 2 | 14.3K | 57.3K | by Jan 1993 – Nov 1997 |
| Barrow, S. W. et Al O-3-13280 | Wright Brothers Energy, Inc. only | Willow Slough (Frio 2) | Chambers | 2 | 12.2K | 1.65K | by Jan 1993 – Jun 1996 |
| H&F Properties -CB- Unit O-1-7626 | McDay Energy Corp. only | Alligator Slough (Elaine) | Zavala | 1 | 12K | 510 | by Jan 1993 – Aug 2026 |
| H&F Properties "CC" O-1-8472 | McDay Energy Corp. only | Alligator Slough (Elaine) | Zavala | 1 | 11.6K | 350 | by Jan 1993 – Aug 2026 |
| Tytex O-3-27619 | Mueller Exploration, Inc. only | Willow Slough,n.(nodosaria 9500) | Chambers | 1 | 9.34K | 44.3K | Oct 2018 – Jan 2020 |
| J. C. Lewis O-3-24940 | Atlas Operating LLC only | Duncan Slough (Frio Cons.) | Matagorda | 3 | 8K | 121K | Jan 2007 – Aug 2026 |
| J.M. Frost Estate Unit O-3-21814 | Latex Petroleum Corporation only | Willow Slough, North (F-2 Sand) | Chambers | 1 | 7.29K | 12 | by Jan 1993 – Sep 1995 |
| H&F Properties "EB" Unit O-1-6428 | McDay Energy Corp. only | Alligator Slough (Elaine) | Zavala | 1 | 6.25K | 218 | by Jan 1993 – Aug 2026 |
| Tanton O-3-25590 | Wallis Energy, Inc. only | Maple Slough (Upper Wilcox Cons) | Hardin | 1 | 6.15K | 0 | Nov 2010 – Aug 2022 |
| Barrow Unit O-3-23653 | C & E Operating, Inc. only | Willow Slough (Frio 2) | Chambers | 1 | 6.03K | 0 | Mar 1999 – Jul 2001 |
| Naiser O-3-22372 | Hughes, Dan A. Company only | Mott Slough (Yegua 7250) | Wharton | 1 | 5.06K | 16.9K | Mar 1994 – Jul 1997 |
| Barrow R.J. O-3-14266 | Wright Brothers Energy, Inc. only | Willow Slough (Frio 2) | Chambers | 1 | 4.96K | 1K | by Jan 1993 – Jun 1996 |
| WS C-1 Unit O-3-9037 | Kerr-McGee Oil & Gas Onshore LLC only | Willow Slough (FB-B, C-1) | Chambers | 3 | 4.78K | 2.13K | by Jan 1993 – Aug 1995 |
| D J Unit B O-3-19350 | Reichmann Petroleum Corp. only | Maple Slough (Upper Wilcox, Oil) | Hardin | 1 | 4.55K | 19.1K | Mar 1996 – Dec 2006 |
| H&F Properties -E- O-1-6152 | Diversified O&G Prod. Co., Inc. only | Alligator Slough (Elaine) | Zavala | 5 | 2.94K | 224 | by Jan 1993 – Aug 1995 |
| H&F Properties -C- O-1-6997 | Live Oak Gas Company only | Alligator Slough (Elaine) | Zavala | 2 | 1.74K | 125 | by Jan 1993 – Oct 1999 |
| Connerly, Josephine -B- O-3-11297 | Oil Well Buyers Corp. only | Willow Slough, N. (F-1) | Chambers | 1 | 1.23K | 26 | by Jan 1993 – Jul 1999 |
| Arco Fee O-3-25592 | Primrose Resources, LLC only | Maple Slough (Upper Wilcox Cons) | Hardin | 1 | 996 | 0 | Nov 2010 – Nov 2014 |
| H&F Properties "E-II" O-1-13989 | BP Prod. Corp. only | Alligator Slough (Elaine) | Zavala | 1 | 590 | 19 | Sep 1995 – Jul 1999 |
| Williams, G. L. O-3-25064 | Texakota, Inc. only | Gum Slough (Yegua) | Jasper | 1 | 570 | 0 | Oct 2007 – Oct 2007 |
| Hollyfield Unit O-3-19427 | Locin Oil Corporation only | Maple Slough (Upper Wilcox, Oil) | Hardin | 1 | 325 | 2.76K | by Jan 1993 – Mar 1995 |
| Arco Fee O-3-25517 | Dogwood Operating Company, Inc. only | Maple Slough (Upper Wilcox) | Hardin | 1 | 301 | 0 | May 2010 – Oct 2010 |
| D J Unit A O-3-25591 | Primrose Resources, LLC only | Maple Slough (Upper Wilcox Cons) | Hardin | 1 | 171 | 0 | Dec 2010 – Mar 2013 |
| Barrow, R.J. O-3-11818 | Kerr-McGee Oil & Gas Onshore LP only | Willow Slough (FB-B, SBZ) | Chambers | 1 | 131 | 1 | Sep 1994 – Sep 1994 |
| D J Unit A O-3-25516 | Dogwood Operating Company, Inc. only | Maple Slough (Upper Wilcox) | Hardin | 1 | 76 | 0 | May 2010 – Oct 2010 |
| Tytex O-3-25299 | McGowan Working Partners, Inc. only | Willow Slough,n.(nodosaria 9500) | Chambers | 2 | 0 | 0 | — |
| Connerly, J. -a- O/A O-3-5552 | Oil Well Buyers Corp. only | Willow Slough, North (F-2 Sand) | Chambers | 1 | 0 | 0 | — |
| White Estate -A- O-3-7843 | Oryx Energy Company only | Willow Slough (FB-B, C-1) | Chambers | 1 | 0 | 0 | — |
| Hebert & Broussard -A- O-3-24465 | Gcows Operating LLC only | Willow Slough | Chambers | 1 | 0 | 0 | — |
| Stoddard -A- O-3-6656 | Elliott Oil & Gas Company only | Duncan Slough (Frio-5) | Matagorda | 1 | 0 | 0 | — |
| J.M. Frost Estate Unit #1 O-3-21039 | Swift Energy Company only | Willow Slough, N (F-4) | Chambers | 1 | 0 | 0 | — |
| Ticonderoga Gas Unit B O-3-27318 | Magnum Producing, LP only | Maple Slough (Upper Wilcox Cons) | Hardin | 1 | 0 | 0 | — |
| Lewis-McDonald O-3-16593 | Gaither Petroleum Corporation only | Duncan Slough, SW (Frio 2) | Matagorda | 1 | 0 | 0 | — |
| Barrow Heritage Ranch et Al O-3-28027 | Zachry Exploration, LLC only | Willow Slough | Chambers | 1 | 0 | 0 | — |
| Slough O-14-3235 | Kaiser-Francis Oil Company only | Bechthold (Tonkawa) | Lipscomb | 1 | 0 | 0 | — |