| University 54-23 #442-413-32746 | Highmount Expl & Prod Texas LLC | Schleicher, TXOzona NE. (Canyon 7520) | PluggedGas | 8,700 | Mar 24, 2011 | — | — |
| University 57 2 #342-413-32743 | Highmount Expl & Prod Texas LLC | Schleicher, TXSawyer (Canyon) | PluggedGas | 8,750 | Mar 18, 2011 | — | — |
| Marigliano #160842-413-32719 | Highmount Expl & Prod Texas LLC | Schleicher, TXWildcat | PluggedGas | 8,400 | Dec 17, 2010 | — | — |
| Hollenbeck #158442-413-32699 | Highmount Expl & Prod Texas LLC | Schleicher, TXSawyer (Canyon) | PluggedGas | 7,950 | Oct 22, 2010 | — | — |
| Epps 48 #542-435-39180 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 7,650 | Jun 26, 2009 | — | — |
| Savell 119 #142-105-40901 | Highmount Expl & Prod Texas LLC | Crockett, TXSawyer (Canyon) | PluggedGas | 11,500 | Oct 22, 2008 | — | — |
| Stewart #20742-435-39052 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 5,750 | Jul 30, 2008 | — | — |
| Stewart #20642-435-39046 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 5,750 | Jul 18, 2008 | — | — |
| Stewart #10442-435-38960 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 6,500 | Apr 18, 2008 | — | — |
| Evans 120 #342-413-32498 | Highmount Expl & Prod Texas LLC | Schleicher, TXSonora (Canyon Upper) | PluggedGas | 7,400 | Dec 20, 2007 | — | — |
| Stewart 36 #442-435-38770 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 5,550 | Nov 16, 2007 | — | — |
| Renfro 45 #142-435-38731 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 8,975 | Oct 17, 2007 | — | — |
| University 54-25 #142-413-32410 | Highmount Expl & Prod Texas LLC | Schleicher, TXOzona NE. (Canyon 7520) | PluggedGas | 8,250 | Oct 12, 2006 | — | — |
| Stanford 6 #142-413-32400 | Highmount Expl & Prod Texas LLC | Schleicher, TXSawyer (Canyon) | PluggedGas | 8,200 | Sep 22, 2006 | — | — |
| Cauthorn Ranch 28 #142-435-37491 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 9,000 | Jun 29, 2005 | — | — |
| Fawcett Randee Trust B #1842-435-37443 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 9,000 | May 23, 2005 | — | — |
| Thomson #1342-435-37399 | Highmount Expl & Prod Texas LLC | Sutton, TXSonora (Canyon Upper) | PluggedGas | 6,400 | Apr 22, 2005 | — | — |
| University 5416 #242-413-32248 | Highmount Expl & Prod Texas LLC | Schleicher, TXOzona NE. (Canyon 7520) | PluggedGas | 7,900 | Dec 29, 2004 | — | — |
| University 5717 #242-413-32249 | Highmount Expl & Prod Texas LLC | Schleicher, TXKama (Canyon) | PluggedGas | 7,900 | Dec 29, 2004 | — | — |
| Creek #970142-435-36994 | Highmount Expl & Prod Texas LLC | Sutton, TXSonora (Canyon Upper) | PluggedGas | 6,600 | Jul 23, 2004 | — | — |
| Askew 42 #642-435-36616 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 6,250 | Dec 22, 2003 | — | — |
| Martin #2442-435-36303 | Highmount Expl & Prod Texas LLC | Sutton, TXSonora (Canyon Upper) | PluggedGas | 6,500 | Apr 17, 2003 | — | — |
| Mitchell Tom 1 #542-435-36291 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 8,700 | Apr 11, 2003 | — | — |
| Shurley #9442-435-36244 | Highmount Expl & Prod Texas LLC | Sutton, TXFawcett (Wolfcamp) | PluggedGas | 6,100 | Mar 7, 2003 | — | — |
| Cauthorn Mack 129 #942-435-36212 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 7,000 | Feb 13, 2003 | — | — |
| Stewart 4 #342-435-36186 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 4,700 | Jan 31, 2003 | — | — |
| Shoubrouek Van #140142-105-38935 | Highmount Expl & Prod Texas LLC | Crockett, TXSawyer (Canyon) | PluggedGas | 9,200 | Nov 12, 2002 | — | — |
| Mitchell Tom 1 #242-435-36030 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 7,600 | Sep 23, 2002 | — | — |
| Wallace 113 #142-435-36028 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 6,000 | Sep 20, 2002 | — | — |
| Fields 16 #1542-435-35579 | Highmount Expl & Prod Texas LLC | Sutton, TXSawyer (Canyon) | PluggedGas | 6,200 | Jul 25, 2001 | — | — |
| Hull #242-435-32434 | Highmount Expl & Prod Texas LLC | Sutton, TXSonora (Canyon Upper) | PluggedGas | 6,300 | Dec 10, 1980 | — | — |