| Oconnor, Dennis, Etal -L- O-2-2845 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 81 | 3.49M | 48.5M | Jan 1993 – Jul 2026 |
| Skinny Dennis 468 O-11-70377 | Burk Royalty Co., Ltd. only | Platang (San Andres) | Yoakum | 5 | 1.41M | 4.26M | May 2015 – Jul 2026 |
| Howard-Dennis O-13-4176 | Peba Oil & Gas, Inc. only | Montague County Regular | Montague | 33 | 364K | 93 | Jan 1993 – Jul 2026 |
| Oconnor, Dennis, et al -N- O-2-3598 | T-C Oil Company, LLC only | Huff (372) | Refugio | 7 | 314K | 481K | Jan 1993 – Jul 2026 |
| Oconnor, Dennis Etal -D- O-2-4401 | T-C Oil Company, LLC only | Terrell Point (3100) | Goliad | 2 | 237K | 116K | Jan 1993 – Aug 2021 |
| O'Connor, Dennis et al -N- O-2-8738 | T-C Oil Company, LLC only | Huff (3000, FB-W) | Refugio | 1 | 205K | 133K | Sep 2002 – Jul 2026 |
| O'Connor, Dennis et al -A- O-2-8133 | T-C Oil Company, LLC only | Melon Ranch (5800) | Refugio | 1 | 157K | 201K | Dec 1995 – Jul 2026 |
| Dennis O-11-68460 | R3 Operating Corporation only | Anita (Clearfork) | Hockley | 5 | 155K | 20.8K | Jul 2002 – Jul 2026 |
| Dennis, Sol O-7-6939 | Basa Resources, Inc. only | East Texas | — | 13 | 142K | 70.2K | Jan 1993 – Jul 2026 |
| Dennis O-8-26229 | D.J. & T. Energy only | Taylor County Regular | Taylor | 6 | 133K | 34 | Jan 1993 – Jul 2026 |
| Thompson, Dennis O-1-108 | Watson Energy Investments, LLC only | Big Foot | Frio | 15 | 133K | 46.9K | Jan 1993 – Jul 2026 |
| O'Connor, Dennis O-2-3014 | T - C Oil Company only | Lake Pasture, West (4450) | Refugio | 8 | 133K | 1.78M | Jan 1993 – Mar 2001 |
| O'Connor, Dennis et al -N- O-2-8931 | T-C Oil Company, LLC only | Huff (2950 Sand) | Refugio | 1 | 122K | 128K | Nov 2004 – Jul 2026 |
| Dennis Dim O-1-16452 | Exco Operating Company, LP only | Briscoe Ranch (Eagleford) | Dimmit | 1 | 122K | 86.8K | Nov 2012 – Jul 2026 |
| O'Connor, Dennis et al "G" O-2-8384 | T - C Oil Company only | Lake Pasture, West (4500) | Refugio | 1 | 99.1K | 55.1K | Jun 1998 – Jan 2009 |
| Howard Heirs O-13-25549 | Dennis & Davis Oil Co. only | Montague County Regular | Montague | 10 | 98K | 401 | Jan 1993 – Jul 2026 |
| Dennis Unit D Dim O-1-16472 | Exco Operating Company, LP only | Briscoe Ranch (Eagleford) | Dimmit | 1 | 84.5K | 130K | Nov 2012 – Jul 2026 |
| Dennis Unit B Dim O-1-16121 | Exco Operating Company, LP only | Briscoe Ranch (Eagleford) | Dimmit | 1 | 81.8K | 150K | Jul 2012 – Jul 2026 |
| Drgac, Dennis W. O-3-14206 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk-3) | Burleson | 1 | 72.7K | 87.7K | Jan 1993 – Jul 2026 |
| Dennis -B- O-13-4135 | Bridwell Oil Co. only | Montague County Regular | Montague | 6 | 66.1K | 21 | Jan 1993 – Jul 2026 |
| O'Connor, Dennis et Al O-2-6270 | Allegro Investments, Inc. only | Telferner | Victoria | 1 | 54.7K | 16.4K | Jan 1993 – Sep 2007 |
| Dennis, H. L. O-13-2033 | Davis, Kelly J. only | Cooke County Regular | Cooke | 10 | 52.6K | 21 | Jan 1993 – Jul 2026 |
| Dennis, L. S. O-13-4207 | Hadley Oil Company, LLC only | Montague County Regular | Montague | 8 | 49.7K | 22 | Jan 1993 – Jul 2026 |
| Keyser, P. B. O-13-23923 | 7-Iron Oil & Gas, LLC only | Dennis (Bryson) | Jack | 5 | 48.5K | 74.4K | Jan 1993 – Jul 2026 |
| Marek, Dennis O-3-20663 | Anadarko E&P Onshore LLC only | Giddings (Austin Chalk-3) | Burleson | 1 | 47K | 585K | Jan 1993 – Aug 2015 |
| Dennis, A.A., Jr. O-5-2387 | Barrow-Shaver Resources Co. only | Thomas Lake (Rodessa D) | Henderson | 1 | 46.1K | 148 | Jan 1993 – Dec 2025 |
| Dennis, Sol D. Oil Unit No. 1 O-6-11460 | Basa Resources, Inc. only | Melissa-Robin (Pettet) | Rusk | 1 | 45.8K | 1.89K | Jan 1993 – Jul 2026 |
| Dennis O-11-69348 | New Height Energy, LLC only | Spraberry, West (Deep, Penn.) | Dawson | 1 | 42.6K | 38.7K | Dec 2008 – Jul 2026 |
| Dennis, A. J. Est. O-13-12952 | Davis, Kelly J. only | Cooke County Regular | Cooke | 9 | 41.5K | 21 | Jan 1993 – Jul 2026 |
| Dennis O-13-4134 | Bridwell Oil Co. only | Montague County Regular | Montague | 2 | 39.3K | 21 | Jan 1993 – Jul 2026 |
| Dennis-Dube O-1-4784 | Atlas Operating LLC only | Jeanie (Serpentine) | — | 1 | 36.3K | 22 | Jan 1993 – Jul 2026 |
| Dennis, A. J. -B- O-13-2137 | BP Petroleum Operations, LLC only | Cooke County Regular | Cooke | 10 | 32.6K | 21 | Jan 1993 – Jul 2026 |
| O'Connor, Dennis et al -G- O-2-8580 | T - C Oil Company only | Lake Pasture (H-434) | Refugio | 6 | 32.5K | 234K | Jan 2001 – Feb 2002 |
| Dennis Heirs O-8-3283 | Sandstone Services, LLC only | Shackelford County Regular | Shackelford | 33 | 32.4K | 381 | Jan 1993 – Jul 2026 |
| Rowland, J. W. O-13-17607 | Dennis & Davis Oil Co. only | Montague County Regular | Montague | 15 | 31.1K | 375 | Jan 1993 – Jul 2026 |
| Dennis O-9-14583 | Cinnabar Energy, Ltd. only | Clarke (Gardner) | Runnels | 2 | 26.6K | 24.1K | Jul 1996 – Aug 2014 |
| Dennis, H. L. O-13-2138 | BP Petroleum Operations, LLC only | Cooke County Regular | — | 8 | 25.5K | 21 | Jan 1993 – Jul 2026 |
| Dennis, A. J. -A- O-13-2136 | Breeze Oil, LLC only | Cooke County Regular | Cooke | 6 | 24.6K | 26 | Jan 1993 – Jul 2026 |
| Dennis, J. S. O-8-3284 | Sandstone Services, LLC only | Shackelford County Regular | Shackelford | 24 | 24.2K | 341 | Jan 1993 – Jul 2026 |
| Dennis O-13-2060 | Davis, Kelly J. only | Cooke County Regular | Cooke | 10 | 22.8K | 21 | Jan 1993 – Jul 2026 |
| Keyser O-13-23405 | 7-Iron Oil & Gas, LLC only | Dennis (Bryson) | Jack | 1 | 21.4K | 66.2K | Jan 1993 – Jul 2026 |
| Brooks, Dennis O-1-13055 | Ubetco, Inc. only | Minerva-Rockdale | Milam | 1 | 21.3K | 21 | Jan 1993 – Jul 2026 |
| Dennis, Sue Seay O-13-15469 | Great American Resources Inc. only | Sue Seay (Bryson) | — | 2 | 20.9K | 2.98K | Jan 1993 – Jul 2026 |
| O'Connor, Dennis et al "N" O-2-7844 | T - C Oil Company only | Huff (5290) | Refugio | 1 | 20.2K | 159K | Jan 1993 – Mar 2003 |
| Dennis 5 O-10-44825 | Ovintiv USA Inc. only | Spraberry (Trend Area) | Howard | 1 | 19.1K | 133K | Feb 2014 – Jul 2026 |
| Dennis O-10-21022 | Kneupper Oil, LLC only | Roberdeau, S. (Clear Fork Lower) | — | 1 | 14.2K | 140 | Jan 1993 – Jul 2026 |
| Dennis O-11-70069 | Aviator Energy, LLC only | Peg's Draw (Spraberry) | Borden | 2 | 13.7K | 6.9K | Jul 2012 – Jul 2026 |
| Thedford O-13-24746 | 7-Iron Oil & Gas, LLC only | Dennis (Bryson) | Jack | 1 | 10.3K | 37K | Jan 1993 – Jul 2026 |
| Dennison, James A. O-13-27823 | V & H Oil, L.P. only | Cooke County Regular | Cooke | 1 | 8.94K | 42 | Jan 1993 – Jul 2026 |
| Dennison O-13-2220 | V & H Oil, L.P. only | Cooke County Regular | — | 4 | 8.91K | 21 | Jan 1993 – Jul 2026 |