| Slough B O-3-27633 | Wildfire Energy Operating LLC only | Giddings (Eagleford) | Brazos | 2 | 485K | 224K | Jul 2019 – Mar 2026 |
| Acom -A- O-3-24784 | Gcows Operating LLC only | Willow Slough,n.(nodosaria 9500) | Chambers | 1 | 287K | 778K | Oct 2005 – Sep 2024 |
| Maccarthy, Janet G-3-199113 | Denbury Onshore, LLC only | Willow Slough, N. (10770 Sand) | Chambers | 1 | 254K | 2.42M | Nov 2003 – May 2008 |
| Red Slough Unit O-3-24611 | Wildfire Energy Operating LLC only | Giddings (Buda) | Brazos | 1 | 244K | 178K | Jun 2004 – Mar 2026 |
| Mooring Slough Unit EB O-3-27168 | Wildfire Energy Operating LLC only | Giddings (Eagleford) | Robertson | 2 | 208K | 101K | Jan 2017 – Mar 2026 |
| Naiser, J.E. Estate G-3-131991 | Faulconer Energy, LLC only | Mott Slough (Yegua) | Wharton | 1 | 182K | 10.3M | Jan 1993 – Apr 2026 |
| Tytex G-3-147820 | Rutherford Oil Corporation only | Willow Slough,n.(nodosaria 9500) | Chambers | 1 | 164K | 1.43M | Nov 1993 – Jun 1996 |
| 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 | 130K | 33 | Feb 2007 – Apr 2026 |
| Pavlik O-3-22613 | Chevron Midcontinent, L.P. only | Mott Slough (Yegua 7150) | Wharton | 1 | 79.1K | 525K | Sep 1994 – Jul 2007 |
| Sheard Gas Unit G-3-174860 | Faulconer, Vernon E., Inc. only | Mott Slough (Yegua) | Wharton | 1 | 76K | 2.63M | Sep 1999 – Jan 2015 |
| Naiser, J. E. Estate G-3-133342 | Faulconer Energy, LLC only | Mott Slough (Yegua) | Wharton | 1 | 67.3K | 5.46M | Jan 1993 – Apr 2026 |
| Tanton O-3-23382 | Omega Energy Corp. only | Maple Slough (Wilcox 10000) | Hardin | 1 | 64.6K | 299K | Nov 1997 – Oct 2010 |
| Santos-Lewis GU G-3-188995 | Atlas Operating LLC only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 49K | 2.3M | Sep 2001 – Mar 2026 |
| Saint John Catholic Church Unit G-3-168100 | Faulconer Energy, LLC only | Mott Slough (Yegua) | Wharton | 1 | 45.3K | 3.99M | May 1998 – Apr 2026 |
| D J Unit A O-3-19428 | Fusion XP, Inc. only | Maple Slough (Upper Wilcox, Oil) | Hardin | 1 | 44.5K | 177K | 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 | Jan 1993 – Jul 2001 |
| Jackson G-3-279195 | Hilcorp Energy Company only | Willow Slough (13300) | Chambers | 1 | 38.4K | 2.62M | Feb 2015 – Nov 2021 |
| Hebert & Broussard G-3-186758 | Kerr-McGee Oil & Gas Onshore LLC only | Willow Slough (Nod. B-3) | Chambers | 1 | 37.9K | 2.95M | Oct 2001 – Jul 2002 |
| Lewis, J. C. G-3-160251 | Atlas Operating LLC only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 37.8K | 859K | Sep 1996 – Mar 2026 |
| Richter G-3-148926 | Faulconer Energy, LLC only | Mott Slough (Yegua) | Wharton | 1 | 36.2K | 1.56M | Feb 1994 – Apr 2026 |
| Zboril, Henry G-3-130032 | Faulconer Energy, LLC only | Mott Slough (Yegua) | Wharton | 1 | 34.9K | 3.34M | Jan 1993 – Apr 2026 |
| Lewis, J. C. O-3-6349 | Expro Engineering, Inc. only | Duncan Slough (Frio-4) | Matagorda | 2 | 30.6K | 156K | Jan 1993 – Mar 2001 |
| White, William C. et Al G-3-150126 | Rutherford Oil Corporation only | Willow Slough,n.(nodosaria 9500) | Chambers | 1 | 29.9K | 819K | May 1994 – Nov 1999 |
| Runnells Gas Unit G-3-201102 | IV Standard, LLC only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 29.7K | 4.72M | Nov 2003 – Apr 2026 |
| 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 |
| Pierce Est. Oil & Gas Ints. G-3-48189 | IV Standard, LLC only | Duncan Slough, S. (Frio, Lo.) | Matagorda | 1 | 26.8K | 1.92M | Sep 1993 – Apr 2026 |
| Lewis, J. C. "C" G-3-217099 | Atlas Operating LLC only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 26.5K | 773K | Mar 2006 – Mar 2026 |
| Stovall, Guy F. Trust G-3-149968 | Viper S.W.D., LLC only | Mott Slough (Yegua) | Wharton | 1 | 23.1K | 441K | Jun 1994 – Sep 2022 |
| Allegro-Buckeye G-3-202774 | Gaither Petroleum Corporation only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 22.4K | 1.1M | Feb 2004 – Nov 2014 |
| Lewis, J. C., -C- G-3-6039 | Expro Engineering, Inc. only | Duncan Slough (Frio-2) | Matagorda | 1 | 21.6K | 471K | Jan 1993 – Feb 2006 |
| Ticonderoga Gas Unit B G-3-281398 | Magnum Producing, LP only | Maple Slough (Upper Wilcox Cons) | Hardin | 1 | 20.7K | 55.8K | Jul 2015 – Jul 2016 |
| Federal Land Bank of Texas G-3-150653 | Swift Energy Company only | Willow Slough (FB-B, Hack-A) | Chambers | 1 | 20K | 1.8M | Aug 1994 – Dec 1997 |
| Arco Fee O-3-19446 | Dogwood Operating Company, Inc. only | Maple Slough (Upper Wilcox, Oil) | Hardin | 1 | 19.1K | 91.3K | Jan 1993 – Apr 2010 |
| Zboril, Henry G-3-130570 | Faulconer, Vernon E., Inc. only | Mott Slough (Yegua) | Wharton | 1 | 18.7K | 2.29M | Jan 1993 – Feb 2016 |
| Lewis, J. C. O-3-21941 | Expro Engineering, Inc. only | Duncan Slough (Frio-3) | Matagorda | 1 | 17.9K | 241K | Jan 1993 – Sep 2006 |
| Srubar, Dorothy G-3-127749 | Faulconer Energy, LLC only | Mott Slough (Yegua) | Wharton | 1 | 17.6K | 2.27M | Jan 1993 – Apr 2026 |
| Buckeye Ranch Unit G-3-271146 | Tri-C Resources Partners I, LLC only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 17.2K | 312K | Oct 2013 – Apr 2024 |
| Lewis, J. C. O-3-6350 | Expro Engineering, Inc. only | Duncan Slough (Frio-5) | Matagorda | 2 | 14.3K | 57.3K | Jan 1993 – Nov 1997 |
| Lewis, J. C. G-3-153266 | Expro Engineering, Inc. only | Duncan Slough (Frio-8) | Matagorda | 1 | 13.7K | 689K | Feb 1995 – Jul 2000 |
| Steele, L. M. Trust G-3-130044 | Amrwr, LLC only | Duncan Slough, SW (Frio 7) | Matagorda | 1 | 12.7K | 3.08M | Jan 1993 – May 2011 |
| Barrow, S. W. et Al O-3-13280 | Wright Brothers Energy, Inc. only | Willow Slough (Frio 2) | Chambers | 2 | 12.2K | 1.65K | Jan 1993 – Jun 1996 |
| H&F Properties -CB- Unit O-1-7626 | McDay Energy Corp. only | Alligator Slough (Elaine) | Zavala | 1 | 12K | 510 | Jan 1993 – Apr 2026 |
| H&F Properties "CC" O-1-8472 | McDay Energy Corp. only | Alligator Slough (Elaine) | Zavala | 1 | 11.6K | 350 | Jan 1993 – Apr 2026 |
| Wakefield G-3-267028 | Gcows Operating LLC only | Willow Slough (FB-B, UN 2) | Chambers | 1 | 10.5K | 2.06M | May 2012 – Apr 2026 |
| Slough, Henry G-14-21763 | Far West Development, LLC only | Bechthold (Tonkawa) | Lipscomb | 1 | 10.1K | 358K | Jan 1993 – Mar 2023 |
| Pierce Estates G-3-51155 | Bushmaster Production Comp, LLC only | Duncan Slough, SE. (Frio Lo.) | Matagorda | 1 | 10K | 696K | Jan 1993 – Mar 2026 |
| Santos-Lewis GU G-3-188108 | Gaither Petroleum Corporation only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 9.83K | 249K | Feb 2002 – Sep 2005 |
| Naiser, J. E. Estate G-3-133377 | Faulconer Energy, LLC only | Mott Slough (Yegua) | Wharton | 1 | 9.41K | 2.76M | Jan 1993 – Apr 2026 |