| Holzmark, Emma O-2-2143 | Eldon Oil Co. only | Macdon (Hockley) | Bee | 3 | 63K | 21 | by Jan 1993 – Aug 2026 |
| Markham O-14-9114 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 62.3K | 87.8K | Mar 2014 – Aug 2026 |
| Edinburg Unit G-4-199312 | Royal Production Company, Inc. only | Edinburg, S. (Marks 11030) | Hidalgo | 1 | 61.7K | 8.05M | Nov 2003 – Jul 2014 |
| Doyle, Robert B. G-14-266559 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 59.8K | 644K | Sep 2010 – Apr 2023 |
| Slavin 110 O-14-8432 | Highmark Energy Operating, LLC only | Pan Petro (Cleveland) | Ochiltree | 1 | 59.6K | 317K | Mar 2011 – Aug 2026 |
| Reba N Miller G-14-282340 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 59.5K | 875K | Mar 2017 – Aug 2026 |
| Doyle, Robert B G-14-278802 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 59K | 600K | Feb 2015 – Aug 2026 |
| Trosper, Corwin 431 O-14-7609 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 2 | 58.4K | 655K | Aug 2005 – Aug 2026 |
| Ohio-Sun Unit O-3-12601 | Goldking Minerals Mgmt, L.L.C. only | Markham N.-Bay City, N (Betts) | Matagorda | 12 | 58.3K | 116K | by Jan 1993 – Jun 2022 |
| Marks G-6-187192 | Permian Natural Resources only | Concord Dome (Rodessa) | Anderson | 1 | 57.2K | 688K | Jul 2001 – Oct 2021 |
| University "C" O-10-33935 | Highmark Energy Operating, LLC only | Shafter Lake (San Andres) | Andrews | 2 | 56.8K | 27.6K | Sep 1993 – Mar 2020 |
| El Cid -A- O-1-5394 | Bush, Mark A. Oil and Gas Inc. only | Pearsall (Austin Chalk) | Dimmit | 5 | 56.7K | 16.7K | by Jan 1993 – Nov 2021 |
| Doyle, Robert B G-14-266469 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 55.4K | 358K | Sep 2011 – Jul 2026 |
| Price, Willis D. G-14-265459 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 54.8K | 646K | Jan 2011 – Nov 2017 |
| Runnells O-3-27630 | Fairway Operating, Inc. only | Markham N.-Bay City, N (Carlson) | Matagorda | 1 | 53.2K | 46.8K | Sep 2019 – Aug 2026 |
| Doyle, Robert 'B' G-14-279623 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 52.8K | 788K | Feb 2015 – Aug 2026 |
| Hillard, E. L. O-6-3092 | Landmark Drilling, L.L.C. only | Mooringsport (Lime) | Harrison | 1 | 52.3K | 20 | Feb 1993 – Jul 2026 |
| Alma O-10-7001 | Highmark Energy Operating, LLC only | TXL (Silurian) | Ector | 5 | 52.1K | 132K | by Jan 1993 – Oct 2017 |
| Miles, Hayden B O-10-37980 | Highmark Energy Operating, LLC only | Deep Rock (Glorieta 5950) | Andrews | 1 | 52K | 15K | Jul 2006 – Dec 2023 |
| Peyton 111 O-14-8400 | Highmark Energy Operating, LLC only | Pan Petro (Cleveland) | Ochiltree | 1 | 50.9K | 210K | Mar 2011 – Aug 2026 |
| Tregellas 675 O-14-8341 | Highmark Energy Operating, LLC only | Pan Petro (Cleveland) | Lipscomb | 3 | 50.6K | 460K | May 2011 – Aug 2026 |
| King, E. F. O-10-1722 | Highmark Energy Operating, LLC only | Fuhrman-Mascho | Andrews | 7 | 49.9K | 79.7K | by Jan 1993 – Aug 2014 |
| Moody, E. O-3-24294 | Highmark Energy Operating, LLC only | Conroe (Cons. L) | Montgomery | 1 | 49.5K | 1.3M | Nov 2002 – Jul 2025 |
| Kelly O-1-15217 | Shidler, Mark L., Inc. only | Austin Pierce (Austin Chalk) | Gonzales | 1 | 49.5K | 16.4K | Feb 2010 – Aug 2026 |
| Johnson -A- O-10-26596 | Highmark Energy Operating, LLC only | Cowden, North (Canyon) | Ector | 2 | 49.3K | 3.72K | by Jan 1993 – Aug 2026 |
| Doyle, Robert B G-14-267105 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 49.1K | 118K | Apr 2011 – Sep 2019 |
| Cook 130 O-14-8716 | Highmark Energy Operating, LLC only | Pan Petro (Cleveland) | Ochiltree | 1 | 49.1K | 315K | Jul 2012 – Aug 2026 |
| Patos Gas Unit G-3-146623 | Shidler, Mark L., Inc. only | Eagle's Claw (Yegua) | Wharton | 1 | 48.6K | 2.07M | Jul 1993 – Sep 2018 |
| Degoche, Louise G-4-256218 | Jericho Energy Partners, LLC only | Landa (Marks) | Hidalgo | 1 | 48.5K | 10.6M | May 2010 – Aug 2026 |
| Burrus 187 O-14-8478 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 48.4K | 248K | Aug 2011 – Oct 2024 |
| Uvacek G-3-189840 | Shidler, Mark L., Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 47.2K | 987K | May 2002 – May 2012 |
| Alma O-10-16751 | Highmark Energy Operating, LLC only | TXL (Devonian) | Ector | 3 | 47K | 215K | by Jan 1993 – Dec 2023 |
| Marks, Albert Unit O-3-14288 | SBJ Energy Partners, L.L.C. only | Giddings (Austin Chalk-3) | Burleson | 1 | 46.7K | 120K | by Jan 1993 – Jun 2026 |
| Crowther O-1-14887 | Sunray Marketing, LLC only | Cloeter (Wilcox 5800) | McMullen | 1 | 46.7K | 26.9K | Dec 2007 – Jun 2015 |
| Brice Unit O-2-6025 | Eldon Oil Co. only | Holzmark | Bee | 1 | 46.3K | 21 | by Jan 1993 – Aug 2026 |
| University 155 O-10-33625 | Highmark Energy Operating, LLC only | Shafter Lake (Ellenburger) | Andrews | 2 | 46.2K | 20K | by Jan 1993 – May 2024 |
| Doyle, Robert B G-14-278576 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 45.8K | 497K | Feb 2015 – Aug 2026 |
| Fairway/James Lime/Unit G-6-208429 | Highmark Energy Operating, LLC only | Fairway (James Lime) | Anderson | 1 | 45.1K | 2.49M | Feb 2005 – Apr 2025 |
| Smith, Iva L. O-6-12635 | Rockwall Marketing Corporation only | Redwater (Smackover) | Bowie | 1 | 44.7K | 35.4K | by Jan 1993 – Jan 1998 |
| Swink 390 O-14-8419 | Highmark Energy Operating, LLC only | Pan Petro (Cleveland) | Ochiltree | 1 | 44.7K | 364K | Apr 2011 – Jun 2024 |
| Wooten, H. O. O-11-65817 | Highmark Energy Operating, LLC only | Wasson 72 | Yoakum | 1 | 44.4K | 40.7K | by Jan 1993 – Mar 2006 |
| Callaway, C. B. O-11-62550 | Geomark Resources, L.L.C. only | Roaring Springs, W. (Permo-Penn) | Motley | 1 | 43.8K | 146 | by Jan 1993 – Aug 2026 |
| Harry Parker 697 G-14-281852 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 43.6K | 598K | Nov 2016 – Aug 2026 |
| University -153- O-10-20848 | Highmark Energy Operating, LLC only | Shafter Lake (San Andres) | Andrews | 3 | 43.5K | 19.1K | by Jan 1993 – Sep 2024 |
| Born 332 O-14-8462 | Highmark Energy Operating, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 42.2K | 1.09M | Oct 2011 – Aug 2026 |
| Keystone Mills Co. G-3-190753 | Highmark Energy Operating, LLC only | Conroe (Middle Wilcox Cons.) | Montgomery | 1 | 41.9K | 5.49M | Jan 2002 – Sep 2007 |
| Moody, E. O-3-24369 | Highmark Energy Operating, LLC only | Conroe (Cons. U) | Montgomery | 2 | 41.8K | 7.22K | Apr 2003 – May 2026 |
| Graham O-14-6757 | Highmark Energy Operating, LLC only | Peery (Cleveland) | Ochiltree | 1 | 41.7K | 552K | by Jan 1993 – Aug 2026 |
| Hudson, T. E., Mrs., O/A O-3-2972 | Reo Operating LLC only | Markham | Matagorda | 2 | 41.7K | 19 | by Jan 1993 – Aug 2026 |
| Cooper, J. W. O-11-13640 | Geomark Resources, L.L.C. only | Roaring Springs, W. (Permo-Penn) | Motley | 2 | 41.2K | 146 | by Jan 1993 – Aug 2026 |