| Shafter Lake Clearfork Unit #403442-003-39232 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | Shut inOil | 7,026 | Apr 29, 2004 | — | — |
| Shafter Lake Clearfork Unit #504542-003-39238 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | Shut inOil | 7,019 | Apr 7, 2004 | — | — |
| Shafter Lake Clearfork Unit #506742-003-39234 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | ActiveOil | 7,015 | Apr 5, 2004 | — | — |
| Shafter Lake Clearfork Unit #425642-003-39236 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | Shut inOil | 7,005 | Apr 5, 2004 | — | — |
| Shafter Lake Clearfork Unit #406742-003-39237 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | ActiveOil | 7,025 | Apr 5, 2004 | — | — |
| Shafter Lake Clearfork Unit #404542-003-39233 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | Shut inOil | 7,015 | Apr 1, 2004 | — | — |
| Landers 522 #1HZ42-295-32746 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 7,960 | Mar 17, 2004 | — | — |
| Covington Ella B #1942-445-32039 | Highmark Energy Operating LLC | Terry, TXSuntura (Lower Clear Fork) | Shut inOil | 8,564 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #68742-445-32040 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,115 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #50942-445-32041 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,411 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #53042-445-32042 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,361 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #57942-445-32043 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | Shut inOil | 7,320 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #58342-445-32044 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,342 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #61342-445-32045 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,420 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #30342-445-32047 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,368 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #48042-445-32048 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,351 | Mar 5, 2004 | — | — |
| Prentice Northeast Unit #50342-445-32049 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,337 | Mar 5, 2004 | — | — |
| Rhodes W. S. #1642-339-00795 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. L) | Temporarily abandonedGas | 5,131 | Feb 26, 2004 | — | — |
| Prentice Northeast Unit #55842-445-31983 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 8,401 | Jan 9, 2004 | — | — |
| Cooper 436 #142-295-32722 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | PluggedOil | 8,650 | Dec 16, 2003 | — | — |
| Rogers 407 #142-357-32427 | Highmark Energy Operating LLC | Ochiltree, TXNorthrup (Cleveland) | Shut inOil | 8,000 | Dec 12, 2003 | — | — |
| Fairway /James Lime/ Unit #445342-213-30861 | Highmark Energy Operating LLC | Henderson, TXFairway (James Lime) | PluggedOil | 10,500 | Oct 31, 2003 | — | — |
| CNB Trustees 360 #2HZ42-295-32705 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,318 | Oct 2, 2003 | — | — |
| Prentice Northeast Unit #55942-445-32027 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | Shut inOil | 7,395 | Aug 28, 2003 | — | — |
| Prentice Northeast Unit #80142-445-32028 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | Shut inOil | 7,371 | Aug 28, 2003 | — | — |
| Prentice Northeast Unit #47942-445-32029 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,391 | Aug 28, 2003 | — | — |
| Prentice Northeast Unit #68642-445-32025 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,118 | Aug 18, 2003 | — | — |
| Prentice Northeast Unit #75342-445-32026 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | Shut inOil | 7,172 | Aug 18, 2003 | — | — |
| Hansford G U 9 #442-195-31623 | Highmark Energy Operating LLC | Hansford, TXHansford (Morrow Upper) | Temporarily abandonedGas | 7,850 | Aug 12, 2003 | — | — |
| Moore H. N. #6742-339-31014 | Highmark Energy Operating LLC | Montgomery, TXConroe (Middle Wilcox Cons.) | Temporarily abandonedGas | 15,269 | Aug 12, 2003 | — | — |
| Hansford G U 18 #342-195-31617 | Highmark Energy Operating LLC | Hansford, TXHansford (Morrow Upper) | ActiveGas | 8,100 | Aug 5, 2003 | — | — |
| Keystone Cattle Co. #14642-495-01299 | Highmark Energy Operating LLC | Winkler, TXFlying -W- | PluggedOil | 9,800 | Jul 22, 2003 | — | — |
| Moody E. #3542-339-31048 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Shut inOil | 3,747 | Jul 8, 2003 | — | — |
| Dobbins C. L. #842-339-31050 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 4,000 | Jul 8, 2003 | — | — |
| Keystone Mills #4742-339-31011 | Highmark Energy Operating LLC | Montgomery, TXConroe (Middle Wilcox Cons.) | Temporarily abandonedGas | 13,750 | Jun 19, 2003 | — | — |
| Lewis J. W. a #3942-339-31047 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 4,000 | Jun 18, 2003 | — | — |
| Brillhart 818 #4HZ42-295-32683 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | Temporarily abandonedGas | 7,966 | May 8, 2003 | — | — |
| Hansford G U 8 #242-195-31607 | Highmark Energy Operating LLC | Hansford, TXHansford (Morrow Upper) | ActiveGas | 7,650 | Apr 21, 2003 | — | — |
| Moody E. #3442-339-31045 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 2,800 | Mar 25, 2003 | — | — |
| Prentice Northeast Unit #50142-445-32009 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,395 | Feb 27, 2003 | — | — |
| Madeley AA & da #109P42-339-31042 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 2,300 | Feb 20, 2003 | — | — |
| Madeley AA & da #103P42-339-31043 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 1,820 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #271W42-445-32007 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | Shut inOil | 7,364 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #30142-445-32008 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | Shut inOil | 7,390 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #50442-445-32010 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,395 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #50842-445-32011 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,404 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #51042-445-32012 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,387 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #517L42-445-32013 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | PluggedOil | 7,175 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #54142-445-32014 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,045 | Feb 20, 2003 | — | — |
| Prentice Northeast Unit #80042-445-32015 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | PluggedOil | 7,296 | Feb 20, 2003 | — | — |