| McFaddin Trust O-3-702 | Gepard Energy Inc | Clam Lake | 41 | 1.85M | 763K | by Jan 1993 – Jul 2026 |
| Sunset Unit O-3-26108 | Hilcorp Energy Company | Sunset (Frio 8230) | 2 | 1.08M | 604K | Oct 2012 – Aug 2026 |
| McFaddin O-3-24865 | Square Mile Energy, L.L.C. | Big Hill Bayou (H-4) | 1 | 807K | 2.01M | Apr 2006 – Sep 2017 |
| Blauw-Paetz O-3-9024 | Shoco Production LLC | Stowell (Sullivan LF) | 2 | 726K | 551K | by Jan 1993 – Jul 2026 |
| Thomas, E., Mrs. et Al O-3-10454 | Hilcorp Energy Company | Fannett | 3 | 648K | 1.13M | by Jan 1993 – Aug 2026 |
| McDermond, F. O-3-12200 | Hilcorp Energy Company | Nome SE. (Frio, UP) | 2 | 639K | 153K | by Jan 1993 – Aug 2026 |
| State Tract 30 Unit O-3-25092 | Davis Petroleum Corp. | Pleasure Island (H-1 Hackberry) | 4 | 616K | 1.65M | Nov 2007 – Jun 2018 |
| McFaddin State O-3-701 | Gepard Energy Inc | Clam Lake | 7 | 603K | 284K | by Jan 1993 – Jun 2026 |
| Gladys City O-3-3963 | Rheaco Oil Company, Ltd. | Spindletop | 104 | 602K | 21 | by Jan 1993 – Aug 2026 |
| Gladys City O-3-3959 | Kingwood Exploration LLC | Spindletop | 15 | 601K | 60.1K | by Jan 1993 – Aug 2026 |
| Owens Unit, et Al O-3-9021 | Shoco Production LLC | Stowell (Sullivan LF) | 1 | 601K | 588K | by Jan 1993 – Jun 2018 |
| Attridge O-3-9023 | Shoco Production LLC | Stowell (Sullivan LF) | 3 | 499K | 618K | by Jan 1993 – Jul 2026 |
| McFaddin, W.P.H. O-3-3960 | Kingwood Exploration LLC | Spindletop | 18 | 497K | 46.5K | by Jan 1993 – Aug 2026 |
| Broussard Trust O-3-26066 | Hilcorp Energy Company | Pond Gully (Frio 8110) | 1 | 451K | 240K | Sep 2012 – Aug 2025 |
| Sonny V O-3-26652 | Hackberry Oil & Gas LLC | Port Acres (Marg-Frio Cons.) | 2 | 450K | 516K | May 2014 – Aug 2026 |
| Thomas, E., et Al O-3-20896 | Hilcorp Energy Company | Fannett | 27 | 447K | 795K | by Jan 1993 – Dec 2023 |
| Koch, T.K. O-3-19423 | Texcal Energy (GP) LLC | Winnie, S.E. (Hutcheson) | 2 | 407K | 328K | by Jan 1993 – May 2007 |
| McFaddin Ranch O-3-10421 | Kingwood Exploration LLC | McFaddin Ranch (Miocene -Q- West | 4 | 388K | 71.5K | by Jan 1993 – Oct 2007 |
| Folts, W. H. et Al O-3-11360 | White Marlin Operating Co, LLC | La Belle (8600) | 1 | 383K | 923K | by Jan 1993 – Jul 2026 |
| Sherron, Elenor et Al O-3-24849 | Allied-Gulf Energy, LLC | Ineeda (Hackberry) | 1 | 356K | 116K | Apr 2006 – Mar 2020 |
| MMK O-3-26396 | Hackberry Oil & Gas LLC | Port Acres (Marg-Frio Cons.) | 1 | 348K | 282K | May 2013 – Aug 2026 |
| Sherron, Eleanor Etal O-3-23760 | Allied-Gulf Energy, LLC | Ineeda (Nodosaria B) | 1 | 323K | 538K | Aug 1999 – Mar 2006 |
| Wilson Jr. High Unit O-3-24194 | Noble Energy Inc | Nederland (Frio 2) | 1 | 309K | 368K | Mar 2002 – Mar 2007 |
| Texas Exploration Co., R/a -A- O-3-7886 | US Ecology Winnie, LLC | Big Hill | 7 | 293K | 23.5K | by Jan 1993 – Aug 2026 |
| Clark O-3-11431 | Rheaco Oil Company, Ltd. | Spindletop | 25 | 281K | 21 | by Jan 1993 – Aug 2026 |
| Keith & Dowlen O-3-303 | Hilcorp Energy Company | Beaumont, West | 16 | 279K | 464K | by Jan 1993 – Jan 2004 |
| Bordages, P., Est. O-3-1501 | Hilcorp Energy Company | Fannett | 6 | 276K | 696K | by Jan 1993 – Aug 2026 |
| Casey Mineral Trust O-3-24729 | Serco Operating LLC | Little Engine (Nod. Blanpedi) | 1 | 270K | 87.8K | May 2005 – Nov 2020 |
| Clubb, J. T. O-3-23692 | Allied-Gulf Energy, LLC | Ineeda (Hackberry) | 1 | 268K | 1.37M | Mar 1999 – Jan 2014 |
| E. Pleasant et al Unit O-3-20825 | Milestone Operating, Inc. | Lovells Lake (Frio 2) | 1 | 266K | 308K | by Jan 1993 – Aug 2026 |
| Clubb, G. D. O-3-24871 | Square Mile Energy, L.L.C. | Train (Hackberry) | 1 | 266K | 117K | Jun 2006 – Feb 2012 |
| Jefferson Land Co. a/C #1 O-3-9043 | Milestone Operating, Inc. | Lovells Lake (Marg. 2) | 11 | 256K | 325K | by Jan 1993 – Aug 2026 |
| Exxon Fee O-3-21281 | Texcal Energy (GP) LLC | Winnie, S.E. (Hutcheson) | 1 | 254K | 259K | by Jan 1993 – Nov 1999 |
| Spalding, Oakley C. O-3-19316 | White Marlin Operating Co, LLC | La Belle (6500) | 1 | 253K | 123K | by Jan 1993 – Apr 2024 |
| Walter Co. Unit O-3-24724 | Serco Operating LLC | Green Gully (Nod Blanpedi) | 1 | 252K | 176K | Apr 2005 – Aug 2026 |
| Jefferson Land Company O-3-9052 | Milestone Operating, Inc. | Lovells Lake (Frio 2) | 6 | 237K | 382K | by Jan 1993 – Aug 2026 |
| Sabco Folts O-3-25866 | White Marlin Operating Co, LLC | La Belle (8600) | 1 | 232K | 667K | Oct 2011 – Aug 2026 |
| Catfish O-3-25151 | Square Mile Energy, L.L.C. | La Belle, SW (6500) | 1 | 227K | 243K | Jan 2007 – Apr 2016 |
| Glady's City Oil Og&m Co O-3-24811 | Kingwood Exploration LLC | Spindletop | 12 | 219K | 39.4K | Dec 2005 – Oct 2022 |
| Wingate, Pansy Etal O-3-23695 | Lgdc Corporation | Ineeda (Hackberry) | 1 | 217K | 1.48M | Jul 1999 – Feb 2007 |
| Hankamer O-3-22034 | S & S Operating Company, Inc. | Stowell, South (Smith -A-) | 1 | 216K | 35.4K | Feb 1993 – Aug 2026 |
| Craigen-Hebert Unit O-3-25344 | Rutherford Oil Corporation | Taylor Bayou, East (8700) | 1 | 209K | 115K | Feb 2009 – Mar 2015 |
| Doornbos O-3-24942 | Hughes Oil Operating, LLC | Port Acres (Marg-Frio Cons.) | 4 | 207K | 194K | Jan 2007 – Oct 2020 |
| Davis O-3-18649 | 19TH Hole Production, LLC | Stowell, S. (Crawford, L.) | 1 | 205K | 149K | by Jan 1993 – Aug 2026 |
| Fitzhugh "A" O-3-17645 | Unit Petroleum Company | Big Hill | 3 | 205K | 33 | by Jan 1993 – Jun 2013 |
| Junker-Spencer Etal -a- Tr. -B- O-3-1507 | Hilcorp Energy Company | Fannett | 10 | 201K | 118K | by Jan 1993 – Apr 2016 |
| Craigen, Leo -A- O-3-1504 | Hilcorp Energy Company | Fannett | 5 | 196K | 113K | by Jan 1993 – Oct 2002 |
| Pogo Fee O-3-17935 | Karbuhn Oil Company | Hebert (H-3) | 1 | 191K | 3.11M | by Jan 1993 – Jun 2017 |
| Clubb et al Unit O-3-24647 | Square Mile Energy, L.L.C. | Boots (Nodosaria Blanpiedi) | 1 | 187K | 747K | Nov 2004 – Apr 2008 |
| Hankamer O-3-10633 | S & S Operating Company, Inc. | Stowell, South (Smith -B-) | 1 | 169K | 135K | by Jan 1993 – Aug 2026 |