| Mayfield 34 #1342-435-36620 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,545 | Dec 29, 2003 | — | — |
| Wilson Duke 172 #1142-435-36613 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,882 | Dec 22, 2003 | — | — |
| Wilson Duke #172642-435-36614 | Upp Operating LLC only | Sutton, TXSawyer (Strawn North) | ActiveGas | 8,786 | Dec 22, 2003 | — | — |
| Wilson Duke #172242-435-36615 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,805 | Dec 22, 2003 | — | — |
| Askew 42 #642-435-36616 | Highmount Expl & Prod Texas LLC only | Sutton, TXSawyer (Canyon) | PluggedGas | 6,250 | Dec 22, 2003 | — | — |
| Morriss 62 #642-435-36610 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 5,950 | Dec 19, 2003 | — | — |
| Morriss 64 #542-435-36611 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 6,000 | Dec 19, 2003 | — | — |
| Simmons Ranch #6242-435-36612 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | Temporarily abandonedGas | 8,078 | Dec 19, 2003 | — | — |
| Ward #5142-435-36607 | Upp Operating LLC only | Sutton, TXSonora (Canyon Upper) | ActiveGas | 7,504 | Dec 18, 2003 | — | — |
| Brown/Whitehead 2 #2542-435-36608 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,950 | Dec 18, 2003 | — | — |
| Brown/Whitehead 2 #2442-435-36609 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,850 | Dec 18, 2003 | — | — |
| Mayer #340242-435-36602 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,510 | Dec 17, 2003 | — | — |
| Diebitsch 70 #1042-435-36603 | Upp Operating LLC only | Sutton, TXSawyer (Strawn North) | ActiveGas | 7,915 | Dec 17, 2003 | — | — |
| Mayfield 33 #1442-435-36604 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,550 | Dec 17, 2003 | — | — |
| Simmons Ranch #7842-435-36605 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,140 | Dec 17, 2003 | — | — |
| Cusenbary 60 #542-435-36600 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 5,950 | Dec 16, 2003 | — | — |
| Cusenbary 60 #642-435-36601 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 5,996 | Dec 16, 2003 | — | — |
| Genini #380842-435-36599 | Robert C. Brower LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 6,560 | Dec 15, 2003 | — | — |
| Ward J.W. 118 #1542-435-36597 | Upp Operating LLC only | Sutton, TXSonora (Canyon Upper) | ActiveGas | 7,704 | Dec 11, 2003 | — | — |
| Ward #5342-435-36598 | Upp Operating LLC only | Sutton, TXSonora (Canyon Upper) | ActiveGas | 7,905 | Dec 11, 2003 | — | — |
| Simmons 71 #542-435-36595 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 7,908 | Dec 8, 2003 | — | — |
| Mayfield 32 #942-435-36596 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,780 | Dec 8, 2003 | — | — |
| Hull #960442-435-36592 | Silver Oil & Gas Inc. only | Sutton, TXSonora (Canyon Upper) | ActiveGas | 6,000 | Dec 5, 2003 | — | — |
| Wilson Duke 187 #1242-435-36593 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,773 | Dec 5, 2003 | — | — |
| Brown/Whitehead 2 #3642-435-36594 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,847 | Dec 5, 2003 | — | — |
| Wilson Duke #171242-435-36583 | Upp Operating LLC only | Sutton, TXSawyer (Strawn North) | ActiveGas | 8,762 | Dec 3, 2003 | — | — |
| Wilson Duke #171542-435-36584 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,575 | Dec 3, 2003 | — | — |
| Mayfield 41 #542-435-36585 | Upp Operating LLC only | Sutton, TXSawyer (Strawn North) | ActiveGas | 8,490 | Dec 3, 2003 | — | — |
| Lancaster 154 #542-435-36586 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 7,416 | Dec 3, 2003 | — | — |
| Cusenbary 60A #442-435-36587 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 5,500 | Dec 3, 2003 | — | — |
| Cusenbary 60A #542-435-36588 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 5,500 | Dec 3, 2003 | — | — |
| Barton #1742-435-36590 | Upp Operating LLC only | Sutton, TXSonora (Canyon Upper) | ActiveGas | 7,711 | Dec 3, 2003 | — | — |
| Carta 113 #542-435-36591 | Robert C. Brower LLC only | Sutton, TXSawyer (Canyon) | Temporarily abandonedGas | 6,350 | Dec 3, 2003 | — | — |
| Galbreath M.S. 89 #242-435-36582 | Robert C. Brower LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 6,400 | Dec 1, 2003 | — | — |
| Davis F #1142-435-36579 | Upp Operating LLC only | Sutton, TXSonora (Canyon Upper) | ActiveGas | 5,971 | Nov 25, 2003 | — | — |
| Simmons Ranch #7042-435-36580 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | Temporarily abandonedGas | 8,290 | Nov 25, 2003 | — | — |
| Simmons Ranch #7342-435-36581 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,125 | Nov 25, 2003 | — | — |
| Davis F #1542-435-36576 | Upp Operating LLC only | Sutton, TXSonora (Canyon Upper) | ActiveGas | 6,000 | Nov 21, 2003 | — | — |
| Bloodworth #40142-435-36577 | Upp Operating LLC only | Sutton, TXSawyer (Strawn North) | PluggedGas | 9,850 | Nov 21, 2003 | — | — |
| Sawyer 129 #1242-435-36578 | Robert C. Brower LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 6,775 | Nov 21, 2003 | — | — |
| Simmons Ranch #2342-435-36571 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | Temporarily abandonedGas | 8,340 | Nov 20, 2003 | — | — |
| Simmons Ranch #5242-435-36572 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | Temporarily abandonedGas | 8,380 | Nov 20, 2003 | — | — |
| Simmons Ranch #2442-435-36573 | Upp Operating LLC only | Sutton, TXSawyer (Strawn North) | ActiveGas | 8,350 | Nov 20, 2003 | — | — |
| Sawyer 170 #1242-435-36574 | Robert C. Brower LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 7,510 | Nov 20, 2003 | — | — |
| Sawyer 169 #1642-435-36575 | Robert C. Brower LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 7,500 | Nov 20, 2003 | — | — |
| Duke Wilson 189 #1242-435-36564 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,811 | Nov 19, 2003 | — | — |
| Duke Wilsson 189 #1142-435-36565 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,800 | Nov 19, 2003 | — | — |
| Duke Wilson 188 #1142-435-36566 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,600 | Nov 19, 2003 | — | — |
| Aldwell Winnie R. Trust #1342-435-36567 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,700 | Nov 19, 2003 | — | — |
| Aldwell Winnie R. Trust #1242-435-36568 | Upp Operating LLC only | Sutton, TXSawyer (Canyon) | ActiveGas | 8,574 | Nov 19, 2003 | — | — |