| Exito #1HHZ42-371-40573 | Highmark Energy Operating, LLC | Pecos, TX | Permitted | 9,600 | Oct 16, 2026 | — | — |
| Exito #2HHZ42-371-40574 | Highmark Energy Operating, LLC | Pecos, TX | Permitted | 9,600 | Oct 16, 2026 | — | — |
| Exito #3HHZ42-371-40575 | Highmark Energy Operating, LLC | Pecos, TX | Permitted | 9,600 | Oct 16, 2026 | — | — |
| Exito #4HHZ42-371-40576 | Highmark Energy Operating, LLC | Pecos, TX | Drilled | 9,600 | Oct 16, 2026 | — | — |
| Prospero #1HHZ42-383-42287 | Highmark Energy Operating, LLC | Reagan, TXSpraberry (Trend Area) | Permitted | 7,900 | Feb 20, 2026 | — | — |
| Black Oak #3HHZ42-383-42137 | Highmark Energy Operating, LLC | Reagan, TX | Not on schedule | 10,400 | Jun 18, 2025 | — | — |
| Black Oak #1HHZ42-383-42135 | Highmark Energy Operating, LLC | Reagan, TX | Not on schedule | 10,600 | Jun 13, 2025 | — | — |
| Black Oak #2HHZ42-383-42136 | Highmark Energy Operating, LLC | Reagan, TX | Not on schedule | 10,600 | Jun 13, 2025 | — | — |
| Black Oak #4HHZ42-383-42138 | Highmark Energy Operating, LLC | Reagan, TX | Not on schedule | 10,600 | Jun 13, 2025 | — | — |
| Black Oak #6HHZ42-383-42139 | Highmark Energy Operating, LLC | Reagan, TX | Not on schedule | 10,600 | Jun 13, 2025 | — | — |
| Black Oak #5HHZ42-383-42140 | Highmark Energy Operating, LLC | Reagan, TX | Not on schedule | 10,400 | Jun 13, 2025 | — | — |
| Exito #1HHZ42-389-41743 | Highmark Energy Operating, LLC | Reeves, TX | Not on schedule | 13,000 | May 29, 2025 | — | — |
| Ada J. Hightower #142-213-30394 | Highmark Energy Operating LLC | Henderson, TXMoore Station (Rodessa) | ActiveOil | 11,055 | Nov 4, 2024 | — | — |
| University -F- #6 L42-003-10468 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Devonian) | ActiveOil | 9,739 | Oct 2, 2024 | — | — |
| Miller-Hurt NO.2 #342-213-30755 | Highmark Energy Operating LLC | Henderson, TXFairway (Rodessa) | ActiveOil | 10,140 | May 21, 2024 | — | — |
| J.H. Dickerson #342-213-30290 | Highmark Energy Operating LLC | Henderson, TXFairway (Rodessa) | ActiveOil | 10,080 | Jan 24, 2024 | — | — |
| J.H. Dickerson #242-213-30746 | Highmark Energy Operating LLC | Henderson, TXFairway (Rodessa) | ActiveOil | 10,075 | Jun 28, 2023 | — | — |
| C.P. Dickerson #242-213-30295 | Highmark Energy Operating LLC | Henderson, TXFairway (Rodessa) | ActiveOil | 1,004 | Dec 27, 2022 | — | — |
| McMillian #142-003-34028 | Highmark Energy Operating LLC | Andrews, TXDeep Rock (Wolfcamp) | Shut inOil | 9,550 | Jul 23, 2021 | — | — |
| Covington Ella B #1742-445-31398 | Highmark Energy Operating LLC | Terry, TXSuntura (Lower Clear Fork) | ActiveOil | 8,300 | Aug 15, 2019 | — | — |
| Conroe Field Unit #118D42-339-01500 | Highmark Energy Operating LLC | Montgomery, TXConroe | Shut inOil | 5,163 | Jun 7, 2018 | — | — |
| Conroe Field Unit #80 D42-339-00599 | Highmark Energy Operating LLC | Montgomery, TXConroe | Shut inOil | 5,147 | Nov 20, 2017 | — | — |
| Conroe Field Unit #76D42-339-01288 | Highmark Energy Operating LLC | Montgomery, TXConroe | PluggedOil | 5,102 | Nov 20, 2017 | — | — |
| Conroe Field Unit #17D42-339-01508 | Highmark Energy Operating LLC | Montgomery, TXConroe | Shut inOil | 5,133 | Nov 20, 2017 | — | — |
| Conroe Field Unit #1910D42-339-01470 | Highmark Energy Operating LLC | Montgomery, TXConroe | Shut inOil | 5,126 | Nov 16, 2017 | — | — |
| Conroe Field Unit #100D42-339-01512 | Highmark Energy Operating LLC | Montgomery, TXConroe | ActiveInjection | 5,152 | Nov 16, 2017 | — | — |
| Prentice Northeast Unit #81A42-445-00236 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 6,950 | Sep 11, 2017 | — | — |
| Keystone Cattle Co. #21342-495-02077 | Highmark Energy Operating LLC | Winkler, TXFlying -W- (Wolfcamp) | Shut inOil | 11,777 | Jun 12, 2017 | — | — |
| Prentice Northeast Unit #24 L42-445-00530 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | PluggedOil | 7,500 | Apr 28, 2017 | — | — |
| Keystone Cattle Co. #19242-495-01342 | Highmark Energy Operating LLC | Winkler, TXFlying -W- (Wolfcamp) | ActiveOil | 10,535 | Apr 10, 2017 | — | — |
| University -C- #442-003-01426 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | PluggedOil | 12,308 | Feb 9, 2017 | — | — |
| Conroe Field Unit #163742-339-31115 | Highmark Energy Operating LLC | Montgomery, TXConroe | Temporarily abandonedGas | 5,402 | May 16, 2016 | — | — |
| Conroe Field Unit #22342-339-30823 | Highmark Energy Operating LLC | Montgomery, TXConroe | Temporarily abandonedGas | 5,231 | Jan 15, 2016 | — | — |
| Doyle Robert B #6142HHZ42-295-34215 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveGas | 7,885 | Nov 10, 2014 | — | — |
| Doyle Robert B #6143HHZ42-295-34216 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveGas | 7,980 | Nov 10, 2014 | — | — |
| Doyle Robert B #6144HHZ42-295-34217 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveGas | 7,977 | Nov 10, 2014 | — | — |
| Doyle Robert B #6141HHZ42-295-34214 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveGas | 7,867 | Oct 24, 2014 | — | — |
| University 153 #7 L42-003-05365 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | PluggedOil | 6,775 | Sep 16, 2014 | — | — |
| Prentice Northeast Unit #78R42-445-10242 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,053 | Jul 29, 2013 | — | — |
| Conroe Field Unit #417042-339-31114 | Highmark Energy Operating LLC | Montgomery, TXConroe | ActiveInjection | 5,460 | Jul 26, 2013 | — | — |
| Conroe Field Unit #152842-339-31117 | Highmark Energy Operating LLC | Montgomery, TXConroe | ActiveInjection | 5,478 | Jul 26, 2013 | — | — |
| Santa FE 1002 #4HHZ42-357-33245 | Highmark Energy Operating LLC | Ochiltree, TXAllen-Parker (Marmaton) | ActiveOil | 7,231 | May 14, 2013 | — | — |
| Lockhart 1001 #1HHZ42-357-33246 | Highmark Energy Operating LLC | Ochiltree, TXAllen-Parker (Marmaton) | ActiveOil | 7,366 | May 14, 2013 | — | — |
| Blais 1001 #1HHZ42-357-33247 | Highmark Energy Operating LLC | Ochiltree, TXAllen-Parker (Marmaton) | ActiveOil | 7,371 | May 14, 2013 | — | — |
| Wallville 321 #3HHZ42-357-33219 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,573 | Mar 7, 2013 | — | — |
| Rogers 320 #2HHZ42-357-33213 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,598 | Feb 22, 2013 | — | — |
| Rogers 320 #3HHZ42-357-33198 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,641 | Jan 14, 2013 | — | — |
| Santa FE 1002 #3HHZ42-357-33185 | Highmark Energy Operating LLC | Ochiltree, TXAllen-Parker (Marmaton) | ActiveOil | 7,203 | Nov 28, 2012 | — | — |
| Wallville 321 #2HHZ42-357-33181 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,695 | Nov 5, 2012 | — | — |
| Prentice Northeast Unit #8742-445-00334 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | PluggedOil | 6,750 | Oct 12, 2012 | — | — |