| Irby G-13-243219 | Tatanka Operating, LLC only | Big Mineral Creek (Viola) | Grayson | 1 | 85.8K | 1.18M | Aug 2008 – Apr 2026 |
| Cullar Unit G-13-102812 | XTO Energy Inc. only | Mineral Creek,west (Viola) | Grayson | 1 | 44.8K | 3.95M | Jan 1993 – Apr 2026 |
| Walsh G-13-172045 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 24.4K | 645K | Oct 1998 – Oct 2024 |
| Blacknall, J. C. G-4-140433 | Synergy Oil & Gas, Inc. (A) only | Viola (6200) | Nueces | 1 | 12K | 81.7K | Jan 1993 – Mar 1996 |
| Moore, Peggy G-13-154739 | McCutchin Petroleum Corporation only | Boedeker, SE. (Viola Limestone) | Montague | 1 | 10.2K | 224K | Jun 1995 – Jan 2026 |
| Walsh G-13-195128 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 7.29K | 176K | Apr 2003 – Dec 2022 |
| Swinney, Viola G-6-212227 | Eagle Oil & Gas Co. only | Overton (Cotton Valley Sand) | Smith | 1 | 4.9K | 883K | May 2005 – Apr 2026 |
| Stallings, Viola M. G-14-226406 | Latigo Petroleum, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 2.25K | 706K | Oct 2006 – Mar 2026 |
| Hudgins Trust G-13-288512 | Atoka Operating, Inc. only | Southmayd, North (Baker-Viola) | Grayson | 1 | 2.06K | 13.5K | Feb 2019 – Aug 2021 |
| Eanes South Viola G-13-215985 | Chaparral Energy, L.L.C. only | Eanes (Viola Lime) | Montague | 1 | 1.86K | 80.9K | Nov 2005 – Feb 2007 |
| Stallings, Viola M. G-14-97716 | BP America Production Company only | Lipscomb (Cleveland) | Lipscomb | 1 | 1.51K | 183K | Jan 1993 – Jan 2009 |
| McBee, J. R. G-13-179092 | Cholla Petroleum, Inc. only | Big Mineral Creek (Viola) | Grayson | 1 | 1.44K | 335K | Aug 2000 – Dec 2022 |
| Burrell G-13-117067 | Jones, L. E. Operating, Inc. only | Delaware Bend, North (Viola) | Cooke | 1 | 1.26K | 140K | Jan 1993 – Jul 2024 |
| Rich, J. L. G-13-184434 | Heape Exploration, Inc. only | Gordonville, West (Viola) | Grayson | 1 | 1.17K | 12.5K | Jun 2001 – Nov 2003 |
| Cullar Unit G-13-114603 | Brammer Petroleum, Inc. only | Mineral Creek,west (Viola) | Grayson | 1 | 1.01K | 29.7K | Jan 1993 – Jun 2008 |
| Elaine G-13-289815 | Tatanka Operating, LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 944 | 80.7K | Mar 2020 – Apr 2026 |
| Stallings, Viola M. G-14-168847 | Latigo Petroleum, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 792 | 589K | Apr 1998 – Mar 2026 |
| Stallings, Viola M. G-14-158219 | Latigo Petroleum, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 681 | 356K | Feb 1996 – Mar 2026 |
| Wales G-13-78024 | Willowbend Investments, Inc. only | Wales (Viola) | Montague | 1 | 320 | 374K | Jan 1993 – Apr 2026 |
| Davis Unit G-13-271377 | Jetta Operating Company, Inc. only | Big Mineral Creek (Viola) | Grayson | 1 | 317 | 399K | Nov 2013 – Apr 2026 |
| Pool "B" G-13-36303 | BKV Barnett, LLC only | Pool (Viola Lime) | Denton | 1 | 277 | 157K | Jan 1993 – Aug 2000 |
| Stallings, Viola M. G-14-189561 | BP America Production Company only | Bradford (Cleveland) | Lipscomb | 1 | 249 | 11.2K | Mar 2002 – Sep 2003 |
| Stallings, Viola M. G-14-41273 | BP America Production Company only | Bradford (Cleveland) | Lipscomb | 1 | 207 | 147K | Jan 1993 – Oct 2003 |
| Lee-Hazelwood, Georgia G-13-172046 | Charter Oak Production Co., LLC only | Southmayd, North (Baker-Viola) | Grayson | 1 | 204 | 48.5K | Oct 1998 – Feb 2011 |
| Viola Sims Unit G-5-265633 | Comstock Oil & Gas, LLC only | Bald Prairie (CV Consolidated) | Robertson | 1 | 182 | 2.49M | Nov 2011 – Apr 2026 |
| Stuckey G-13-93794 | BMR Operating LLC only | Gordonville, E (Viola 10500) | Grayson | 1 | 173 | 49.2K | Jan 1993 – Aug 2011 |
| Cantwell, J. A. G-13-284253 | Jay Management Company, LLC only | Bandera-Lila-Lyn (Viola) | Montague | 1 | 152 | 32.2K | Dec 2017 – Apr 2026 |
| Cantwell, J. A. G-13-283611 | Jay Management Company, LLC only | Bandera-Lila-Lyn (Viola) | Montague | 1 | 151 | 30.7K | Dec 2017 – Apr 2026 |
| Kris G-13-227196 | BKM Production only | Mineral Creek,west (Viola) | Grayson | 1 | 89 | 101K | Jun 2006 – Nov 2021 |
| Stallings, Viola M. G-14-186114 | BP America Production Company only | Bradford (Morrow) | Lipscomb | 1 | 40 | 3.54K | Jul 2001 – Feb 2002 |
| Blakley G-13-121184 | Mitchell Energy Corporation only | Pool (Viola Lime) | Wise | 1 | 31 | 87.8K | Jan 1993 – Nov 2000 |
| Lawrence Trust Unit G-13-291800 | Jetta Operating Company, Inc. only | Big Mineral Creek (Viola) | Grayson | 1 | 30 | 99.5K | Oct 2021 – Apr 2026 |
| Munkres G-13-140163 | Fagadau Energy Corporation only | Henrietta, E. (Viola) | Clay | 1 | 17 | 386 | Jan 1993 – Feb 1993 |
| Johnson, W. D. "B" G-13-106179 | Mitchell Energy Company L.P. only | Pruitt (Viola Lime) | Wise | 1 | 13 | 96.3K | Jan 1993 – Apr 2001 |
| Johnson, W. D. "B" G-13-115867 | Mitchell Energy Corporation only | Pruitt (Viola Lime) | Wise | 1 | 8 | 27.8K | Jan 1993 – Oct 1997 |
| Morrow, Viola G-1-50578 | Sellers Lease Service, Inc. only | Mt. Eden (2000) | Gonzales | 1 | 0 | 0 | — |
| Nicholson, Clyde G-13-111372 | Harper, Wayne only | Gas Finders (Viola) | Denton | 1 | 0 | 39.2K | Jan 1993 – Jun 2003 |
| Smith Unit G-13-272214 | Jetta Operating Company, Inc. only | Big Mineral Creek (Viola) | Grayson | 1 | 0 | 5.88K | Oct 2013 – Oct 2018 |
| Everett Unit G-13-281192 | EOG Resources, Inc. only | Wales (Viola) | Montague | 1 | 0 | 0 | — |
| Knapp G-13-97827 | Mitchell Energy Company L.P. only | Pruitt (Viola Lime) | Wise | 1 | 0 | 0 | — |
| Brown G-13-286118 | Atoka Operating, Inc. only | Southmayd, North (Baker-Viola) | Grayson | 1 | 0 | 877 | Feb 2019 – Aug 2020 |
| Finnigan, Viola Gas Unit G-9-101534 | Coppertop only | Eldorado, N. (Canyon B) | Schleicher | 1 | 0 | 125K | Jan 1993 – Jun 2019 |
| Finnigan, Viola Unit G-9-99136 | Coppertop only | Eldorado, N. (Canyon B) | Schleicher | 1 | 0 | 29.6K | Jan 1993 – Apr 2007 |
| Bennett a Unit G-13-291692 | Jetta Operating Company, Inc. only | Big Mineral Creek (Viola) | Grayson | 1 | 0 | 36.9K | Nov 2021 – Apr 2026 |
| Cantwell G-13-292574 | Jay Management Company, LLC only | Bandera-Lila-Lyn (Viola) | Montague | 1 | 0 | 0 | — |
| Clampett, J. D. et Al G-13-296094 | CD Consulting & Operating Co. only | Boedeker, SE. (Viola Limestone) | Montague | 1 | 0 | 190 | Nov 2023 – Apr 2024 |
| Lawrence Trust Unit G-13-300013 | Jetta Operating Company, Inc. only | Big Mineral Creek (Viola) | Grayson | 1 | 0 | 12.6K | Jul 2025 – Apr 2026 |
| Viola G-14-25199 | Scout Energy Management LLC only | Panhandle, West | Moore | 1 | 0 | 136K | Jan 1993 – Aug 2014 |
| Wallace, Viola D. G-6-61624 | HRB Operating Company, Inc. only | Scoober Creek (Rodessa-Hill) | Rusk | 1 | 0 | 257K | Jan 1993 – Oct 2015 |
| Creech, Viola G-6-15822 | Chevron U. S. A. Inc. only | Carthage (Paluxy) | Panola | 1 | 0 | 77.9K | Jan 1993 – May 2005 |