| Hamilton, J. H. O-2-850 | McGowan Working Partners, Inc. | Lolita, Deep (4-Way Zone) | Jackson | 2 | 130K | 70.3K | by Jan 1993 – Jul 2026 |
| Shanks, M. W. O-3-4134 | McGowan Working Partners, Inc. | Thompson, North | Fort Bend | 3 | 118K | 46.6K | by Jan 1993 – Dec 2002 |
| Campbell, J. A. O-6-160 | McGowan Working Partners, Inc. | Cayuga | Anderson | 11 | 117K | 94.7K | by Jan 1993 – Aug 2026 |
| Ware, G. W. O-6-14266 | McGowan Working Partners, Inc. | Cayuga (Woodbine) | Anderson | 2 | 117K | 62.7K | Jun 2003 – Aug 2026 |
| Welder Hrs. "A" O-4-2840 | McGowan Working Partners, Inc. | Seven Sisters | Duval | 3 | 113K | 6.91K | Apr 1995 – Apr 2023 |
| Security Bank & Trust Co. O-3-2610 | McGowan Working Partners, Inc. | Lane City | Wharton | 5 | 111K | 53.5K | by Jan 1993 – Jan 2015 |
| Huebner, M. D. O-3-12883 | McGowan Working Partners, Inc. | Lucky, South (8700) | Matagorda | 2 | 108K | 12.1K | by Jan 1993 – Oct 2017 |
| Bennett, W. H. O-2-703 | McGowan Working Partners, Inc. | Heyser | Calhoun | 3 | 103K | 318K | by Jan 1993 – Aug 2026 |
| Knape, J. O-3-23216 | McGowan Working Partners, Inc. | Walk Man | Brazoria | 1 | 102K | 119K | May 1997 – Feb 2002 |
| Stark Foundation O-3-18109 | McGowan Working Partners, Inc. | Shannon, N. (Nodosaria) | Orange | 1 | 98.3K | 1.02M | by Jan 1993 – Jun 2006 |
| Tullis 215/214 Unit O-2-8944 | McGowan Working Partners, Inc. | Tom Lyne, NE. (Hockley E) | Live Oak | 1 | 96.9K | 23.2K | Jan 2005 – Aug 2026 |
| Fisk, Wm. O-3-2902 | McGowan Working Partners, Inc. | Magnet Withers | Wharton | 3 | 96.5K | 38K | by Jan 1993 – Dec 2016 |
| -L- Ranch Co. -A- O-2-874 | McGowan Working Partners, Inc. | Lolita (Marginulina Zone) | Jackson | 12 | 96.3K | 98K | by Jan 1993 – Aug 2026 |
| Bennett, John M. "B-F" O-2-8677 | McGowan Working Partners, Inc. | La Salle, West (6300) | Jackson | 1 | 87.5K | 194K | Nov 2001 – Jul 2026 |
| Dunwoody, Charles O-2-8146 | McGowan Working Partners, Inc. | Heyser (5400 #3) | Calhoun | 1 | 87.3K | 258K | Mar 1996 – Aug 2024 |
| Tullis 216 O-2-8545 | McGowan Working Partners, Inc. | Tom Lyne, NE. (Hockley E) | Live Oak | 1 | 87K | 15.5K | Aug 1999 – Nov 2025 |
| Pierce Estate "J" O-3-16480 | McGowan Working Partners, Inc. | Pierce Ranch (4900) | Wharton | 3 | 81K | 92.7K | by Jan 1993 – Apr 2003 |
| Bennett, W. H. O-2-7419 | McGowan Working Partners, Inc. | Heyser (5400 #3) | Calhoun | 1 | 78.5K | 86.3K | May 2004 – Aug 2026 |
| Knape, J. O-3-24135 | McGowan Working Partners, Inc. | Walk Man (Frio 7550) | Brazoria | 1 | 77.9K | 89.1K | Feb 2002 – Sep 2014 |
| Boyt, Cecil K. Estate O-3-11067 | McGowan Working Partners, Inc. | Cottonwood, S. (8300) | Liberty | 3 | 77.3K | 30.7K | by Jan 1993 – Apr 2004 |
| Four Way Ranch O-2-7784 | McGowan Working Partners, Inc. | Lolita, Deep (7500 Zone) | Jackson | 2 | 71.5K | 254K | by Jan 1993 – Apr 2021 |
| Williams State Unit O-3-22787 | McGowan Working Partners, Inc. | Thompson, North | Fort Bend | 1 | 67.1K | 49.7K | Jan 1995 – Dec 2002 |
| Welder Hrs. O-4-2839 | McGowan Working Partners, Inc. | Seven Sisters | Duval | 6 | 67K | 18 | Apr 1993 – Jan 2013 |
| Johnson, Elmer O-2-7487 | McGowan Working Partners, Inc. | Lolita, Deep (4-Way Zone) | Jackson | 2 | 66.4K | 206K | by Jan 1993 – Aug 2026 |
| Welder, E.H. -C- O-4-12523 | McGowan Working Partners, Inc. | Plymouth (6000 -B- Sand) | San Patricio | 1 | 65.1K | 131K | Jan 1996 – Aug 2026 |
| Booth, F. I. O-3-4129 | McGowan Working Partners, Inc. | Thompson, North | Fort Bend | 5 | 63.8K | 35.7K | by Jan 1993 – Dec 2002 |
| Welder, E. H. "C" O-4-13223 | McGowan Working Partners, Inc. | Plymouth (5390) | San Patricio | 1 | 61.5K | 88.5K | Aug 2004 – Aug 2026 |
| Morgan, V. J. O-3-23522 | McGowan Working Partners, Inc. | Hartburg, NW. (Nodosaria Sd.) | Newton | 1 | 60.1K | 114K | May 1998 – Aug 2008 |
| Scanlan, Lillian, Etal O-3-4136 | McGowan Working Partners, Inc. | Thompson, North | Fort Bend | 5 | 57.7K | 44.6K | by Jan 1993 – Dec 2002 |
| Edens, J. N. G-6-144366 | McGowan Working Partners, Inc. | Cayuga (CV-TP Cons.) | Anderson | 1 | 56.6K | 2.42M | by Jan 1993 – Aug 2026 |
| Moody, W. L. O-3-4132 | McGowan Working Partners, Inc. | Thompson, North | Fort Bend | 5 | 54.9K | 20.5K | by Jan 1993 – Dec 2002 |
| Hampil, J. W. O-3-4131 | McGowan Working Partners, Inc. | Thompson, North | Fort Bend | 9 | 50.9K | 24.3K | by Jan 1993 – Dec 2002 |
| Pierce Estates 'J' O-3-16197 | McGowan Working Partners, Inc. | Pierce Ranch (4850) | Wharton | 2 | 49K | 60.4K | by Jan 1993 – Apr 2003 |
| E. H. Welder 'C' O-4-13790 | McGowan Working Partners, Inc. | Plymouth (6100 Sand) | San Patricio | 1 | 43.9K | 145K | May 2013 – Aug 2026 |
| Duval Ranch Section 281 O-4-8183 | McGowan Working Partners, Inc. | Charamousca, South | Duval | 1 | 41.9K | 14.7K | by Jan 1993 – Sep 2004 |
| Bennett, W.H. O-2-7941 | McGowan Working Partners, Inc. | Heyser (5700) | Calhoun | 2 | 41K | 74.9K | Jan 1994 – Jul 2000 |
| Four Way Ranch O-2-9298 | McGowan Working Partners, Inc. | Lolita, Deep (4-Way Zone) | Jackson | 1 | 38.8K | 164K | Feb 2009 – Jan 2026 |
| Mitchell Estate O-2-10390 | McGowan Working Partners, Inc. | Lolita (Ward Zone) | Jackson | 1 | 37.6K | 56.5K | Jul 2012 – Aug 2026 |
| Edens Gas Unit No. 2 G-6-189942 | McGowan Working Partners, Inc. | Cayuga (Trinity) | Anderson | 1 | 35.5K | 1.36M | Jul 2002 – Aug 2026 |
| Bennett, J. M. O-2-8225 | McGowan Working Partners, Inc. | La Salle, West (Frio 5800) | Jackson | 1 | 34.2K | 56.3K | Oct 1996 – Oct 2001 |
| Scherffius O-2-896 | McGowan Working Partners, Inc. | Lolita (Other Zones) | Jackson | 1 | 33.7K | 12.5K | Nov 2006 – Aug 2024 |
| Welder, E. H. "E" O-4-12390 | McGowan Working Partners, Inc. | Rooke (7100 A) | Brooks | 2 | 30.9K | 394K | Sep 1994 – May 2003 |
| Pierce Estates "E" O-3-11815 | McGowan Working Partners, Inc. | Pierce Ranch (4850) | Wharton | 4 | 28.2K | 39.4K | by Jan 1993 – Apr 2003 |
| Edens, J.N. G-6-169010 | McGowan Working Partners, Inc. | Cayuga (CV-TP Cons.) | Anderson | 1 | 28K | 945K | May 1998 – Aug 2026 |
| Ten Cate O-2-10303 | McGowan Working Partners, Inc. | Lolita (Mopac Sand) | Jackson | 1 | 27.4K | 47.3K | May 2012 – Jun 2015 |
| Sullenberger, M. H. Unit G-6-15910 | McGowan Working Partners, Inc. | Cayuga (Trinity) | Anderson | 1 | 27.4K | 1.71M | by Jan 1993 – Aug 2026 |
| Edens Gas Unit No. 2 G-6-15902 | McGowan Working Partners, Inc. | Cayuga (Trinity) | Anderson | 1 | 25.2K | 1.39M | by Jan 1993 – Aug 2026 |
| Allen, J. H. -E- O-2-873 | McGowan Working Partners, Inc. | Lolita (Marginulina Zone) | Jackson | 3 | 24.3K | 8.7K | by Jan 1993 – Aug 2011 |
| Ferguson Oil Unit O-3-17062 | McGowan Working Partners, Inc. | Pierce Ranch (4900) | Wharton | 1 | 24.3K | 28.7K | by Jan 1993 – Aug 2000 |
| Four-Way Ranch O-2-5046 | McGowan Working Partners, Inc. | Lolita, Deep (7900 Zone) | Jackson | 3 | 22.6K | 46.1K | Aug 2000 – Nov 2010 |