| Q. Little O-13-30686 | Flintlock Exploration, LLC only | Big Mineral Creek (Viola) | Grayson | 1 | 52.5K | 2.2M | Feb 2006 – Aug 2026 |
| Gowans (V) O-13-32868 | Jetta Operating Company, Inc. only | Big Mineral Creek (Viola) | Grayson | 1 | 52.5K | 93.4K | Apr 2014 – Aug 2022 |
| Cantwell, J. A. O-13-29213 | Great American Resources Inc. only | Bandera-Lila-Lyn (Viola) | Montague | 2 | 51.2K | 879K | Sep 1996 – Nov 2017 |
| Cleveland, Joe, Unit O-13-12351 | Stelucan Energy, LLC only | Boedeker, SE. (Viola Limestone) | Montague | 1 | 50.7K | 78.7K | by Jan 1993 – Mar 2024 |
| Crowe O-13-32946 | Tatanka Operating, LLC only | Southmayd, North (Baker-Viola) | Grayson | 2 | 48.8K | 110K | Apr 2014 – Aug 2026 |
| Brown O-13-23837 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 45.7K | 698K | by Jan 1993 – Aug 2026 |
| Gibbons, J.E. O-13-29381 | Grayson Petroleum Company only | Southmayd, North (Baker-Viola) | Grayson | 1 | 45.4K | 144K | Sep 1997 – Aug 2026 |
| Cullar Unit G-13-102812 | XTO Energy Inc. only | Mineral Creek,west (Viola) | Grayson | 1 | 44.9K | 3.97M | by Jan 1993 – Aug 2026 |
| Darter O-13-28885 | Little, Quintin Company,inc.,the only | Southmayd, North (Baker-Viola) | Grayson | 1 | 44K | 38.1K | Dec 1994 – Aug 2026 |
| Hall O-13-18913 | Peterson Oil and Gas LLC only | Bowie, NE. (Viola) | Montague | 1 | 42.5K | 82.8K | by Jan 1993 – Oct 2025 |
| Hazlip O-13-33815 | Tatanka Operating, LLC only | Big Mineral Creek (Viola) | Grayson | 1 | 40.8K | 797K | Jun 2018 – Aug 2026 |
| Brown, W. O-13-24932 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 39.7K | 150K | by Jan 1993 – Oct 2014 |
| Willis O-13-27768 | Felderhoff Production Company only | Southmayd, North (Baker-Viola) | Grayson | 1 | 38.5K | 17.7K | by Jan 1993 – Jul 2026 |
| Blue Sky Unit #1 O-13-33945 | Texcel Exploration, Inc. only | Southmayd, North (Baker-Viola) | Grayson | 1 | 38.4K | 78.3K | Jul 2019 – Aug 2026 |
| Martin O-13-23178 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 37.8K | 179K | by Jan 1993 – Oct 2006 |
| Rich "A" O-13-30376 | Heape Exploration, Inc. only | Gordonville, West (Viola) | Grayson | 1 | 34.6K | 128K | Aug 2004 – Oct 2014 |
| Nabors O-13-22112 | Wise Production Company only | Maxanne (Viola Miss) | Montague | 1 | 34.6K | 10.5K | by Jan 1993 – Aug 2026 |
| Hughes Unit O-13-23738 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 29K | 64.6K | by Jan 1993 – Aug 2026 |
| Logston, Aggie Unit O-13-25703 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 28.7K | 151K | by Jan 1993 – Sep 2013 |
| Bumpass O-13-22028 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 28.1K | 88.4K | by Jan 1993 – Aug 2026 |
| Calhoun O-13-27614 | Precision Operating Inc. only | Southmayd, North (Baker-Viola) | Grayson | 1 | 27.2K | 184K | by Jan 1993 – Jan 2004 |
| Joplin Unit O-13-12110 | Grace, Jack Production Co, LLC only | Boedeker, SE. (Viola Limestone) | Montague | 2 | 27.2K | 46.4K | by Jan 1993 – Dec 2004 |
| Kirby Unit O-13-28263 | Felderhoff Production Company only | Southmayd, North (Baker-Viola) | Grayson | 1 | 26.1K | 21.4K | by Jan 1993 – Apr 2011 |
| Gibbons O-13-27573 | Winchester Production Company only | Southmayd, North (Baker-Viola) | Grayson | 3 | 25.8K | 52.7K | by Jan 1993 – Mar 1996 |
| Hayes O-13-27611 | Winchester Production Company only | Southmayd, North (Baker-Viola) | Grayson | 2 | 25.7K | 61.4K | by Jan 1993 – Mar 1996 |
| Andy O-13-23558 | Pursley, John only | Henrietta, E. (Viola) | Clay | 2 | 25.4K | 142K | by Jan 1993 – Mar 2005 |
| Walsh G-13-172045 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 24.4K | 645K | Oct 1998 – Oct 2024 |
| Bundschuh O-13-24807 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 24.3K | 183K | by Jan 1993 – May 2017 |
| M-K Unit O-13-28985 | Felderhoff Production Company only | Southmayd, North (Baker-Viola) | Grayson | 1 | 24.3K | 52.5K | Aug 1995 – Jul 2026 |
| Barton O-13-28342 | Little, Quintin Company,inc.,the only | Southmayd, North (Baker-Viola) | Grayson | 1 | 24.1K | 34.6K | by Jan 1993 – Jun 2019 |
| Atkinson, Viola O-3-12254 | Oklatex Energy, Inc. only | Amelia (Frio 6) | Jefferson | 1 | 24K | 440 | by Jan 1993 – Jan 2025 |
| Overstreet F. S. O-13-20673 | Bridwell Oil Co. only | Wales (Viola) | Montague | 1 | 23.9K | 349K | by Jan 1993 – Aug 2026 |
| Persons, H. O-13-28150 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 23.8K | 307K | by Jan 1993 – Apr 2009 |
| Boyd O-13-32010 | Borderline Operating Corp. only | Bowie, NE. (Viola) | Montague | 1 | 23.7K | 79.2K | Jan 2012 – Aug 2022 |
| Klas-Kirby O-13-24035 | Starlight Ridge only | Southmayd, North (Baker-Viola) | Grayson | 2 | 22.5K | 52.6K | by Jan 1993 – Aug 2026 |
| Elaine O-13-33061 | Tatanka Operating, LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 21.5K | 131K | Sep 2014 – Feb 2020 |
| Caughey, Earl O-13-26152 | Jetta Operating Company, Inc. only | Southmayd, North (Baker-Viola) | Grayson | 2 | 21.3K | 72.5K | by Jan 1993 – Apr 2017 |
| Morrow, Viola -A- O-1-14148 | Sellers Lease Service, Inc. only | Mt. Eden (Carrizo-Wilcox, Up.) | Gonzales | 1 | 21.1K | 3 | Dec 1997 – Jun 2016 |
| Crowe O-13-32886 | Payson Operating, LLC only | Perrin, N. Afb (Viola) | Grayson | 1 | 20.5K | 34.5K | Jan 2014 – Apr 2015 |
| Hale, Viola O-11-60176 | Pioneer Natural Res. USA, Inc. only | Ackerly (Dean Sand) | Martin | 1 | 19.9K | 166K | by Jan 1993 – Oct 2024 |
| Griggs, Mattie O-13-16319 | Dimock Operating Company only | Bowie, E.(viola) | Montague | 1 | 19.9K | 20 | by Jan 1993 – Aug 2026 |
| Braswell O-13-24062 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 19K | 149K | by Jan 1993 – Aug 2007 |
| Walsh #2 O-13-24376 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 18.6K | 311K | by Jan 1993 – Oct 2004 |
| Irby O-13-31630 | Atoka Energy LLC only | Big Mineral Creek (Viola) | Grayson | 1 | 18.1K | 421K | Apr 2010 – Aug 2026 |
| Poet II O-13-29031 | Silver Creek Oil & Gas, LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 18.1K | 37.8K | May 1995 – Feb 2000 |
| Cantwell O-13-29008 | Bandera Exploration Company only | Bandera-Lila-Lyn (Viola) | Montague | 1 | 17.6K | 134K | Jun 1995 – Oct 1998 |
| Hudgins O-13-34161 | Texcel Exploration, Inc. only | Southmayd, North (Baker-Viola) | Grayson | 1 | 17.5K | 88K | Nov 2022 – Aug 2026 |
| Jones, Tina O-13-30422 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 17K | 161K | Feb 2005 – Aug 2026 |
| Myers, Viola O-13-1780 | Finnell Oil Services, Inc. only | Joy (Strawn) | Clay | 3 | 15.6K | 20 | by Jan 1993 – Aug 2026 |
| Brown, W. #2 O-13-24995 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 15.4K | 580K | by Jan 1993 – Aug 2026 |