| Prentice Northeast Unit O-11-18607 | Highmark Energy Operating, LLC | Prentice (6700) | Terry | 621 | 27.7M | 6.55M | by Jan 1993 – Aug 2026 |
| Conroe Field Unit O-3-11659 | Highmark Energy Operating, LLC | Conroe | Montgomery | 664 | 26.8M | 61.4M | by Jan 1993 – Aug 2026 |
| Fairway /James Lime/ Unit O-6-4853 | Highmark Energy Operating, LLC | Fairway (James Lime) | Henderson | 223 | 21.2M | 328M | by Jan 1993 – Aug 2026 |
| Shafter Lake Clearfork Unit O-10-34411 | Highmark Energy Operating, LLC | Shafter Lake (Clear Fork) | Andrews | 79 | 5.64M | 1.51M | Feb 1995 – Aug 2026 |
| Bitler-Lowe Clearfork Unit O-10-29029 | Highmark Energy Operating, LLC | Fullerton | Andrews | 50 | 2.57M | 1.15M | by Jan 1993 – Aug 2026 |
| Deep Rock Etal -A- O-10-1033 | Highmark Energy Operating, LLC | Deep Rock (Glorieta 5950) | Andrews | 9 | 1.68M | 165K | by Jan 1993 – Aug 2026 |
| University San Andres Unit O-10-36661 | Highmark Energy Operating, LLC | Shafter Lake (San Andres) | Andrews | 44 | 744K | 423K | Aug 2001 – Aug 2026 |
| University -154- O-10-5506 | Highmark Energy Operating, LLC | Shafter Lake (Devonian) | Andrews | 6 | 634K | 602K | by Jan 1993 – May 2021 |
| University 155 O-10-33626 | Highmark Energy Operating, LLC | Shafter Lake (Devonian) | Andrews | 8 | 620K | 487K | by Jan 1993 – Aug 2026 |
| University 141A ,173 O-10-5504 | Highmark Energy Operating, LLC | Shafter Lake (Devonian) | Andrews | 15 | 544K | 316K | by Jan 1993 – Aug 2026 |
| Pearl Wheat 764 O-14-7606 | Highmark Energy Operating, LLC | Peery (Cleveland) | Lipscomb | 4 | 539K | 1.79M | Aug 2005 – Aug 2026 |
| Covington, Ella "B" O-11-68595 | Highmark Energy Operating, LLC | Suntura (Lower Clear Fork) | Terry | 8 | 514K | 136K | Jul 2003 – Aug 2026 |
| Ogden -A- O-10-1034 | Highmark Energy Operating, LLC | Deep Rock (Glorieta 5950) | Andrews | 3 | 496K | 12.9K | by Jan 1993 – Aug 2026 |
| Graham-University O-10-27850 | Highmark Energy Operating, LLC | Deep Rock (Glorieta 5950) | Andrews | 3 | 439K | 6.07K | by Jan 1993 – Aug 2026 |
| Bitler-Lowe -B- O-10-13485 | Highmark Energy Operating, LLC | Fullerton | Andrews | 11 | 426K | 269K | by Jan 1993 – Aug 2026 |
| Miles, Hayden A O-10-37793 | Highmark Energy Operating, LLC | Deep Rock (Glorieta 5950) | Andrews | 3 | 418K | 46.1K | May 2006 – Aug 2026 |
| Keystone Cattle Co. O-10-1422 | Highmark Energy Operating, LLC | Flying -W- | Winkler | 7 | 415K | 3.03M | by Jan 1993 – Aug 2026 |
| University 153 O-10-5505 | Highmark Energy Operating, LLC | Shafter Lake (Devonian) | Andrews | 6 | 402K | 185K | by Jan 1993 – Aug 2026 |
| Glass 134 O-14-8033 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 3 | 396K | 1.63M | Sep 2009 – Aug 2026 |
| University -C- O-10-5498 | Highmark Energy Operating, LLC | Shafter Lake (Devonian) | Andrews | 4 | 385K | 238K | Feb 1993 – Oct 2020 |
| Keystone Cattle Co. O-10-8745 | Highmark Energy Operating, LLC | Flying -W- (Wolfcamp) | Winkler | 10 | 362K | 1.34M | by Jan 1993 – Aug 2026 |
| Appel 438 O-14-8145 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 3 | 352K | 3.77M | Apr 2010 – Aug 2026 |
| University -154- O-10-10925 | Highmark Energy Operating, LLC | Shafter Lake (Clear Fork) | Andrews | 5 | 350K | 194K | by Jan 1993 – Aug 2026 |
| Humble-King O-10-1024 | Highmark Energy Operating, LLC | Deep Rock (Ellenburger) | Andrews | 1 | 334K | 278K | by Jan 1993 – Aug 2026 |
| University -F- O-10-19655 | Highmark Energy Operating, LLC | Shafter Lake (Clear Fork) | Andrews | 3 | 318K | 125K | by Jan 1993 – Aug 2026 |
| Brownlee-Cook 127 O-14-8428 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 4 | 302K | 1.69M | Sep 2010 – Aug 2026 |
| University 173 O-10-19459 | Highmark Energy Operating, LLC | Shafter Lake (Clear Fork) | Andrews | 3 | 301K | 152K | by Jan 1993 – Aug 2026 |
| Rogers 386 O-14-8845 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 2 | 297K | 1.81M | Dec 2012 – Aug 2026 |
| Mitchell 763 O-14-7681 | Highmark Energy Operating, LLC | Peery (Cleveland) | Lipscomb | 3 | 288K | 1.14M | Jun 2006 – Aug 2026 |
| Cooper 358 O-14-7764 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 4 | 278K | 3.03M | May 2007 – Aug 2026 |
| Ouida Wilson 45 O-14-8075 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 3 | 270K | 1.78M | Nov 2009 – Aug 2026 |
| Santa FE 1002 O-14-8860 | Highmark Energy Operating, LLC | Allen-Parker (Marmaton) | Ochiltree | 2 | 265K | 669K | Feb 2013 – Aug 2026 |
| Leslie 223 O-14-8403 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 2 | 262K | 850K | Apr 2011 – Aug 2026 |
| Barton 346 O-14-7762 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 4 | 250K | 1.39M | Jan 2007 – Aug 2026 |
| Cooper 445 O-14-7900 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 4 | 242K | 2.38M | Jun 2008 – Aug 2026 |
| Deep Rock et al -A- O-10-21679 | Highmark Energy Operating, LLC | Shafter Lake (San Andres) | Andrews | 4 | 236K | 50.6K | by Jan 1993 – Jan 2023 |
| Pearson 113 O-14-8166 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 3 | 222K | 1.69M | Jul 2010 – Aug 2026 |
| Cooper 436 O-14-7515 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 4 | 222K | 2.46M | Apr 2004 – Aug 2026 |
| Lowe, M. R. 15 O-10-37827 | Highmark Energy Operating, LLC | Fullerton | Andrews | 6 | 216K | 143K | Jul 2006 – Aug 2026 |
| Hunter 676 O-14-7734 | Highmark Energy Operating, LLC | Peery (Cleveland) | Lipscomb | 2 | 216K | 994K | Jan 2007 – Aug 2026 |
| Glass 308 O-14-8486 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 2 | 215K | 1.54M | Feb 2011 – Aug 2026 |
| Alma O-10-6960 | Highmark Energy Operating, LLC | TXL (Ellenburger) | Ector | 5 | 213K | 616K | by Jan 1993 – Aug 2026 |
| CNB Trustees 360 O-14-7490 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 4 | 210K | 2.22M | Jan 2004 – Aug 2026 |
| TXL -G- O-10-25740 | Highmark Energy Operating, LLC | Cowden, North | Ector | 4 | 209K | 281K | by Jan 1993 – Aug 2026 |
| Shell-Perkins O-10-28453 | Highmark Energy Operating, LLC | Deep Rock (Penn.) | Andrews | 10 | 205K | 385K | by Jan 1993 – Aug 2026 |
| Cooper 435 O-14-7883 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 4 | 196K | 2.15M | Jul 2008 – Apr 2020 |
| Malinda 745 G-14-288241 | Highmark Energy Operating, LLC | Allen-Parker (Marmaton) | Ochiltree | 1 | 195K | 1.08M | Nov 2018 – Aug 2026 |
| Swink 402 O-14-8417 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 1 | 191K | 965K | Apr 2011 – Aug 2026 |
| Rader 251 O-14-8690 | Highmark Energy Operating, LLC | Lipscomb (Cleveland) | Lipscomb | 3 | 184K | 2.65M | Aug 2012 – Aug 2026 |
| Rogers 385 O-14-8528 | Highmark Energy Operating, LLC | Pan Petro (Cleveland) | Ochiltree | 2 | 179K | 1.41M | Apr 2012 – Aug 2026 |