| Brownlee-Cook 127 #5HHZ42-357-32926 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,677 | Jun 18, 2010 | — | — |
| Brownlee-Cook 127 #3HHZ42-357-32923 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | Shut inOil | 7,640 | Jun 17, 2010 | — | — |
| Brownlee-Cook 127 #4HHZ42-357-32925 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,640 | Jun 17, 2010 | — | — |
| Doyle Robert B. #2707HHZ42-295-33591 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveGas | 7,823 | Jun 16, 2010 | — | — |
| Appel 438 #7HHZ42-295-33584 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,278 | May 21, 2010 | — | — |
| Price Willis D. #1 C42-295-22453 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Atoka) | Temporarily abandonedGas | 10,228 | May 14, 2010 | — | — |
| Prentice Northeast Unit #89A42-445-00335 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | Shut inOil | 6,732 | May 11, 2010 | — | — |
| Malaney 498 #2HHZ42-357-32888 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,462 | Mar 16, 2010 | — | — |
| Wallville 384 #1HHZ42-357-32887 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,554 | Mar 12, 2010 | — | — |
| Brownlee-Cook 127 #2HHZ42-357-32885 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,630 | Mar 4, 2010 | — | — |
| Schumann 112 #1HHZ42-357-32880 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,211 | Feb 9, 2010 | — | — |
| Glass 112 #1HHZ42-357-32878 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,282 | Feb 8, 2010 | — | — |
| Ouida Wilson 45 #4HHZ42-357-32879 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,532 | Feb 5, 2010 | — | — |
| Hill 433 #6HHZ42-295-33559 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,235 | Jan 29, 2010 | — | — |
| Hill 433 #7HHZ42-295-33560 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | Shut inOil | 8,257 | Jan 29, 2010 | — | — |
| Appel 438 #6HHZ42-295-33547 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | Shut inOil | 8,253 | Dec 4, 2009 | — | — |
| Hill 433 #4HHZ42-295-33545 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,194 | Nov 4, 2009 | — | — |
| Glass 134 #2HHZ42-357-32849 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,444 | Sep 15, 2009 | — | — |
| Ouida Wilson 45 #3HHZ42-393-32252 | Highmark Energy Operating LLC | Roberts, TXPan Petro (Cleveland) | ActiveOil | 7,472 | Aug 18, 2009 | — | — |
| Alma #442-135-02437 | Highmark Energy Operating LLC | Ector, TXTXL (Tubb) | Shut inOil | 9,843 | Jul 13, 2009 | — | — |
| Keystone Cattle Co. #36242-495-31828 | Highmark Energy Operating LLC | Winkler, TXFlying -W- (Wolfcamp) | ActiveOil | 10,600 | Jul 9, 2009 | — | — |
| Pearson 113 #1HHZ42-357-32828 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,219 | Jun 16, 2009 | — | — |
| Glass 134 #1HHZ42-357-32820 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,478 | May 29, 2009 | — | — |
| Bitler-Lowe Clearfork Unit #3 C42-003-34877 | Highmark Energy Operating LLC | Andrews, TXFullerton | ActiveInjection | 7,200 | May 27, 2009 | — | — |
| Swink 391 #1HHZ42-357-32817 | Highmark Energy Operating LLC | Ochiltree, TXPan Petro (Cleveland) | ActiveOil | 7,332 | May 21, 2009 | — | — |
| Appel 438 #5HHZ42-295-33529 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,242 | May 14, 2009 | — | — |
| Hill 433 #5HHZ42-295-33523 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,218 | Apr 28, 2009 | — | — |
| Cooper 358 #5HHZ42-295-33524 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,380 | Apr 28, 2009 | — | — |
| Jones Trust 359 #5HHZ42-295-33518 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Atoka) | ActiveGas | 9,838 | Mar 26, 2009 | — | — |
| Alma #742-135-02440 | Highmark Energy Operating LLC | Ector, TXTXL (Tubb) | Shut inOil | 9,877 | Mar 2, 2009 | — | — |
| Cooper 435 #4HHZ42-295-33495 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | PluggedOil | 9,000 | Jan 29, 2009 | — | — |
| CNB Trustees 360 #6HHZ42-295-33502 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Atoka) | ActiveGas | 9,805 | Jan 23, 2009 | — | — |
| Cooper 445 #4HHZ42-295-33489 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,151 | Jan 21, 2009 | — | — |
| Cooper 436 #4HHZ42-295-33492 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | PluggedOil | 9,000 | Jan 21, 2009 | — | — |
| Keystone Cattle Co. #37742-495-32220 | Highmark Energy Operating LLC | Winkler, TXFlying -W- (Wolfcamp) | ActiveOil | 9,900 | Jan 16, 2009 | — | — |
| CNB Trustees 360 #4HHZ42-295-33490 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,343 | Dec 22, 2008 | — | — |
| CNB Trustees 360 #5HHZ42-295-33491 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,334 | Dec 22, 2008 | — | — |
| Doyle J.B. #3M42-295-32538 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Morrow) | Temporarily abandonedGas | 10,500 | Nov 26, 2008 | — | — |
| Keystone Cattle Co. #37642-495-32132 | Highmark Energy Operating LLC | Winkler, TXFlying -W- | ActiveOil | 11,850 | Nov 26, 2008 | — | — |
| University -C- #342-003-01548 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Wolfcamp) | PluggedOil | 9,926 | Nov 13, 2008 | — | — |
| Shafter Lake Clearfork Unit #505R42-003-40909 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | Shut inOil | 6,847 | Nov 13, 2008 | — | — |
| Tregellas 675 #4HHZ42-295-33409 | Highmark Energy Operating LLC | Lipscomb, TXPan Petro (Cleveland) | PluggedOil | 9,000 | Oct 10, 2008 | — | — |
| Lowe M. R. 6 #242-003-40813 | Highmark Energy Operating LLC | Andrews, TXFullerton | Shut inOil | 7,300 | Oct 4, 2008 | — | — |
| Cooper 357 #3HHZ42-295-33426 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | ActiveOil | 8,353 | Oct 4, 2008 | — | — |
| Rogers 320 #1VHHZ42-357-32769 | Highmark Energy Operating LLC | Ochiltree, TXDutcher (Atoka) | ActiveOil | 9,057 | Sep 9, 2008 | — | — |
| Cooper 358 #4HHZ42-295-33388 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Atoka) | Temporarily abandonedGas | 9,848 | Aug 11, 2008 | — | — |
| Cooper 357 #2HHZ42-295-33389 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Atoka) | ActiveGas | 9,765 | Aug 11, 2008 | — | — |
| Conroe Field Unit #4038D42-339-31091 | Highmark Energy Operating LLC | Montgomery, TXConroe | ActiveInjection | 6,525 | Jul 3, 2008 | — | — |
| Cooper 435 #3VHHZ42-295-33363 | Highmark Energy Operating LLC | Lipscomb, TXLipscomb (Cleveland) | PluggedOil | 9,000 | Jun 25, 2008 | — | — |
| Hill 433 #3HHZ42-295-33357 | Highmark Energy Operating LLC | Lipscomb, TXTrosper (Atoka) | ActiveGas | 9,647 | Jun 18, 2008 | — | — |