| Diaz, Maria O-4-12096 | Beach Exploration, Inc. | Bisonte (V-5) | 1 | 346K | 358 | by Jan 1993 – Aug 2026 |
| Schuster O-4-13946 | Orx Resources, L.L.C. | Mercedes ( 3-M) | 1 | 137K | 193K | Apr 2015 – Aug 2026 |
| Meyerhoff, Emil H. O-4-12758 | Barrett Brothers Oil & Gas, Inc. | Shepherd (5300) | 1 | 132K | 0 | Mar 1998 – Apr 2013 |
| Anna Mae Oil Unit O-4-12344 | Dewbre Petroleum Corporation | Shepherd (5300) | 1 | 111K | 3.81K | May 1994 – Apr 2002 |
| Houston Oil Unit O-4-11982 | BP America Production Company | Donna (20-C) | 1 | 97.4K | 51.2K | by Jan 1993 – May 2001 |
| Garcia, J.A. et Al O-4-12493 | Dewbre Petroleum Corporation | Bloomberg (Patty) | 3 | 93.6K | 176K | Aug 1995 – Aug 2026 |
| Steen, Betty O-4-13456 | Scorpion Operating, Inc. | Sullivan City (Vicksburg, Lower) | 2 | 89.2K | 694K | May 2007 – Sep 2014 |
| West, Temple W., Etal O-4-12697 | Fidelity Explor. & Prod. Co. | Tabasco (F Sand) | 1 | 85.5K | 95.1K | Aug 1997 – May 2004 |
| Chapa O-4-12480 | Rincon Petroleum Corporation | Tabasco (F Sand) | 2 | 79.2K | 360K | Aug 1995 – Sep 2011 |
| Sorenson Oil Unit -1 O-4-12854 | Wagner Oil Company | Donna (Rice 3-West) | 3 | 76.3K | 475K | Jul 1999 – Apr 2005 |
| Gueera Gas Unit O-4-13522 | Dewbre Petroleum Corporation | Arrowhead (Alh Sand) | 1 | 70.8K | 0 | Sep 2008 – Apr 2021 |
| Bentsen Bros O-4-163 | Dewbre Petroleum Corporation | Arrowhead | 3 | 64K | 21.7K | Jul 2005 – Aug 2026 |
| Bell, W.G. Jr., et Al O-4-12348 | Contract Energy, L.L.C. | Santa Rita (5200) | 1 | 57.4K | 20.7K | May 1994 – Jul 1999 |
| Schuster Oil Unit O-4-13381 | Wagner Oil Company | Donna (Upper Morin) | 2 | 54.7K | 351K | Jun 2006 – Aug 2008 |
| Drawe, W. H. O-4-10288 | Dewbre Petroleum Corporation | Capisallo (8600) | 1 | 53.3K | 3.35K | by Jan 1993 – Aug 2026 |
| McAllen Fieldwide Unit O-4-11916 | Merit Energy Company | McAllen (Biedenharn, Upper) | 4 | 51.3K | 316K | by Jan 1993 – Dec 2000 |
| Swallow Gas Unit O-4-12556 | Wagner Oil Company | Donna (6700) | 1 | 47.2K | 50.4K | May 1996 – Aug 2026 |
| Guerra, A. "B" O-4-12406 | Wynn-Crosby Energy, Inc. | La Reforma (G-1) | 1 | 43.7K | 51.5K | Nov 1994 – Oct 1996 |
| Kotzur State O-4-13105 | OXY USA Inc. | Nada Aqui (Mvkbg-5) | 1 | 32.7K | 82.3K | Mar 2002 – Jul 2010 |
| Valderas Gas Unit O-4-13327 | Dewbre Petroleum Corporation | Mercedes (11000) | 1 | 27K | 375K | Jun 2005 – Jul 2009 |
| Sweeney, J. J. O-4-12175 | Pmo | Donna (Frio 5600) | 1 | 24K | 53.3K | by Jan 1993 – May 2000 |
| Garcia, J.A. O-4-12416 | Riddle Engineering Corp. | Bloomberg, West (5500) | 1 | 23.1K | 13.8K | Dec 1994 – Dec 1997 |
| Goldston, W. L. et Al O-4-12612 | Proline Energy Resources Inc | Los Indios, W. (MF-133) | 2 | 22.1K | 157K | Aug 1996 – Sep 2019 |
| Robinette, J.C. O-4-12046 | Platinum Oil & Gas, L.L.C. | Donna (Julie) | 1 | 21.8K | 207K | by Jan 1993 – Nov 1996 |
| Goldston, W.L. et Al O-4-12266 | Milagro Exploration, LLC | Los Indios (5300) | 1 | 21K | 68.3K | Oct 1993 – Jan 2001 |
| Harris Gas Unit O-4-12986 | Dewbre Petroleum Corporation | Weslaco, North (Frio Cons.) | 1 | 18.9K | 9.74K | Aug 2000 – Nov 2011 |
| Edgemon, R. P. Unit O-4-11272 | Mission River Systems, Inc. | Mercedes ( 3-M) | 1 | 18.8K | 295 | by Jan 1993 – Jun 2002 |
| Martinez, E.L. Gas Unit I O-4-12839 | Hilcorp Energy Company | Guadalupe (Cavazos) | 1 | 17.2K | 66.3K | Mar 1999 – Apr 2017 |
| Boyce Unit O-4-12982 | Momentum Production Corp. | Scissors (Shary) | 1 | 15.9K | 209 | Nov 2000 – Jun 2004 |
| Card-Hcwc&i Dist. 6 Unit O-4-12667 | Capital Star Oil & Gas, Inc. | Penitas (7950) | 1 | 15.6K | 192K | Jan 1997 – Jun 2001 |
| Garcia Yturria O-4-13873 | Rincon Petroleum Corporation | Cecil | 1 | 14.9K | 9.71K | Feb 2014 – Nov 2015 |
| West, Temple W.,etal O-4-13347 | Hilcorp Energy Company | Tabasco (Consolidated) | 3 | 13.8K | 11.7K | Jun 2008 – Oct 2010 |
| Guerra, A. "B" O-4-12408 | Milagro Exploration, LLC | La Reforma (6430) | 1 | 13.6K | 11.7K | Nov 1994 – Jul 1998 |
| Painter Oil Unit O-4-11908 | Pioneer Resources Producing, L.P | Mercedes (7700) | 1 | 11K | 219K | by Jan 1993 – Aug 1997 |
| Rio Grande Land Trust G.U. #1 O-4-12903 | Texas Independent Explor Ltd. | Mercedes ( 3-M) | 1 | 10.9K | 49K | Aug 1999 – Mar 2005 |
| Houston Oil Unit O-4-11670 | Vastar Resources, Inc. | Donna (Julie) | 1 | 10.3K | 55.8K | by Jan 1993 – Nov 1993 |
| Betty Steen O-4-13514 | Scorpion Operating, Inc. | Daskam | 2 | 9.9K | 190K | Apr 2008 – Apr 2012 |
| Goldston, W.L. et Al O-4-11803 | Proline Energy Resources Inc | Los Indios (P-1) | 1 | 9.67K | 26.5K | by Jan 1993 – Sep 2019 |
| Schaleban O-4-13569 | OXY USA Inc. | Schaleben (6900) | 1 | 8.15K | 32.4K | Jan 2009 – Jun 2015 |
| Chapa, Salomon O-4-12043 | Rincon Petroleum Corporation | Tabasco (E) | 1 | 7.91K | 24.1K | by Jan 1993 – Apr 1997 |
| Dougherty, M. P. O-4-12877 | Atlas Operating LLC | Texan Gardens (7400) | 1 | 7.3K | 181K | Jun 1998 – Feb 2014 |
| Al-Btlt #1 O-4-12602 | Santa Rita Holdings, LLC | Javelina (Frio 5072) | 1 | 7K | 0 | Aug 1996 – Mar 2007 |
| Flores, Salinas O-4-9033 | Southern Tejas Asset Group LLC | Sullivan City (4700) | 1 | 6.74K | 1.96K | Oct 1995 – Jul 2026 |
| Mac Bean Unit O-4-10313 | Pioneer Natural Res. USA, Inc. | Mercedes (7500) | 1 | 6.62K | 226K | Jul 1993 – Aug 2000 |
| Sweeney, J.J. O-4-12189 | Tri-Union Development Corp. | Donna (Rice 6) | 1 | 6.56K | 57.3K | Mar 1993 – Apr 1999 |
| Keirn, Pearl O-4-12644 | Fina Oil & Chemical Company | McAllen (6900) | 1 | 6.5K | 15K | Nov 1996 – Jun 1997 |
| La Blanca Gas Unit O-4-12415 | MW Petroleum Corporation | La Blanca (Hamilton) | 1 | 6.12K | 78.4K | Nov 1994 – Apr 1995 |
| Marinoff, Boris O-4-1663 | Wagner, Duer & Co. | Los Torritos (Marinoff Sand) | 1 | 6.09K | 21 | by Jan 1993 – Oct 1996 |
| Swallow Gas Unit O-4-13196 | BP America Production Company | Donna (6940) | 1 | 4.86K | 20.4K | Dec 2003 – Aug 2004 |
| Schuster O-4-13766 | EOG Resources, Inc. | Mercedes (8200) | 1 | 4.64K | 12K | Nov 2012 – Mar 2015 |