| Southland Royalty "D" O-10-34938 | Highmark Energy Operating, LLC | Wallen (San Andres) | Andrews | 1 | 30.8K | 2.82K | Apr 1996 – Aug 2026 |
| H.N. Moore O-3-25259 | Highmark Energy Operating, LLC | Conroe, S. (Wilcox 1) | Montgomery | 1 | 30.8K | 578K | Jun 2008 – Jan 2020 |
| Malaney 498 O-14-8163 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 1 | 29.7K | 754K | Jun 2010 – Aug 2026 |
| Fairway/James Lime/Unit G-6-209848 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 1 | 29.3K | 2.32M | Mar 2005 – Jun 2026 |
| Price, WD -B- G-14-258033 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 29K | 690K | Feb 2010 – Aug 2026 |
| C.P. Dickerson O-6-15948 | Highmark Energy Operating, LLC | Fairway (Rodessa) | Henderson | 1 | 28.5K | 20.5K | Jan 2023 – Aug 2026 |
| Doyle, Robert B G-14-266454 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 28K | 403K | Jul 2011 – Jan 2016 |
| Alma O-10-16869 | Highmark Energy Operating, LLC | TXL, North (Waddell) | Ector | 5 | 27.9K | 30.1K | Jul 1996 – Aug 2015 |
| Doyle, J.B. G-14-206731 | Highmark Energy Operating, LLC | Lipscomb (Morrow) | Lipscomb | 1 | 27.4K | 2.21M | Sep 2004 – Aug 2026 |
| Isaacs -208- O-14-5550 | Highmark Energy Operating, LLC | Canadian, SW. (Granite Wash) | Hemphill | 1 | 27.1K | 1.06M | by Jan 1993 – Jun 2026 |
| Price, Willis D. G-14-266376 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 26.6K | 407K | Jul 2011 – Jun 2024 |
| Tyson, D.R. G-14-265818 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 26.3K | 506K | Apr 2011 – Aug 2026 |
| Price, Willis D. G-14-224728 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 26.1K | 468K | Nov 2006 – May 2012 |
| William Schultz G-14-266484 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 26K | 390K | Feb 2012 – Feb 2024 |
| Schultz Brothers C G-14-243121 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 25.6K | 490K | Jul 2008 – Feb 2022 |
| Fairway/James Lime/Unit G-6-208183 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 1 | 24.8K | 1.82M | Feb 2005 – Aug 2026 |
| Fairway/James Lime/Unit G-6-181718 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 1 | 24.6K | 2.45M | Mar 2001 – Jun 2025 |
| Doyle, J.B. G-14-219384 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 24.5K | 1.73M | Aug 2006 – Aug 2026 |
| Cabot University Lands O-10-29790 | Highmark Energy Operating, LLC | Shafter Lake (San Andres) | Andrews | 1 | 23.4K | 9.32K | by Jan 1993 – Apr 2014 |
| Brillhart 820 G-14-212724 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 23.4K | 520K | Oct 2005 – Apr 2018 |
| University -II- O-10-11041 | Highmark Energy Operating, LLC | Shafter Lake (San Andres) | Andrews | 1 | 23.2K | 11.8K | by Jan 1993 – Jan 2022 |
| Rogers 407 O-14-7516 | Highmark Energy Operating, LLC | Northrup (Cleveland) | Ochiltree | 1 | 23.2K | 2.13K | May 2004 – Dec 2017 |
| Schultz 696 G-14-218771 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 23.1K | 458K | Aug 2006 – Aug 2026 |
| Weidner 798 G-14-219432 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 23.1K | 210K | Jun 2006 – Sep 2015 |
| Price, Willis D. G-14-215017 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 23K | 528K | Feb 2006 – Mar 2017 |
| Doyle, Robert B. G-14-266382 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 22.9K | 267K | Jul 2011 – Sep 2019 |
| University 174 O-10-22342 | Highmark Energy Operating, LLC | Shafter Lake (Clear Fork) | Andrews | 2 | 22.2K | 6.73K | by Jan 1993 – Jan 2002 |
| Brillhart 820 G-14-210553 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 22.1K | 461K | Jun 2005 – Oct 2016 |
| Fairway/James Lime/Unit G-6-221092 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 1 | 22.1K | 1.7M | Jul 2005 – Aug 2026 |
| Price, WD -B- G-14-214224 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 22K | 314K | May 2005 – Aug 2026 |
| Price, WD -B- G-14-214226 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 21.7K | 330K | Dec 2005 – Jul 2016 |
| Price, WD -B- G-14-223512 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 21.5K | 381K | Sep 2006 – Sep 2017 |
| Harry Parker 697 G-14-281855 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 21.3K | 310K | Nov 2016 – Aug 2026 |
| Martin 800 O-14-9139 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 3 | 21.2K | 1.1M | May 2011 – Aug 2026 |
| Doyle, J.B. G-14-258868 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 20K | 146K | Jun 2010 – Jul 2021 |
| Piper, Ola O. O-14-2326 | Highmark Energy Operating, LLC | Bradford (Tonkawa) | Lipscomb | 1 | 19.6K | 148K | by Jan 1993 – Jun 2002 |
| Lowe, M. R. 6 O-10-39446 | Highmark Energy Operating, LLC | Fullerton | Andrews | 2 | 19.6K | 23.8K | Feb 2009 – Jul 2021 |
| Price, WD -B- G-14-230512 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 18.5K | 319K | Dec 2006 – Sep 2016 |
| Fairway/James Lime/Unit G-6-208186 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 1 | 17.9K | 1.79M | Feb 2005 – Aug 2022 |
| Fairway/James Lime/Unit G-6-210040 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 1 | 17.6K | 3.64M | Apr 2005 – Apr 2024 |
| Harry Parker 697 G-14-281832 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 17.6K | 155K | Nov 2016 – Aug 2026 |
| Fairway/James Lime/Unit G-6-208188 | Highmark Energy Operating, LLC | Fairway (James Lime) | Anderson | 1 | 17.3K | 1.18M | Feb 2005 – Aug 2026 |
| Doyle, J.B. G-14-181633 | Highmark Energy Operating, LLC | Lipscomb (Morrow) | Lipscomb | 1 | 17.2K | 2.57M | Mar 2001 – Sep 2020 |
| Wiederstein 527 G-14-219356 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 17.1K | 675K | May 2006 – Aug 2026 |
| University "C" O-10-37431 | Highmark Energy Operating, LLC | Shafter Lake (Yates) | Andrews | 2 | 16.6K | 14.3K | Nov 2004 – Aug 2026 |
| Doyle, J.B. G-14-209613 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 16.6K | 1.17M | Jan 2005 – Aug 2026 |
| Landers 522 O-14-7526 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 1 | 16.5K | 431K | Jul 2004 – Aug 2026 |
| Fairway/James Lime/Unit G-6-207887 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 1 | 16.5K | 2.11M | Feb 2005 – Nov 2022 |
| Dobbins, C L O-3-24599 | Highmark Energy Operating, LLC | Conroe (Cons. U) | Montgomery | 2 | 16K | 35.8K | Aug 2004 – Jan 2020 |
| Isaacs -210- G-14-62063 | Highmark Energy Operating, LLC | Canadian, SW. (Granite Wash) | Hemphill | 1 | 15.8K | 906K | by Jan 1993 – Jun 2026 |