| American Nat L Bank #242-339-00485 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 5,150 | Feb 4, 2003 | — | — |
| Keystone Mills Co. #4542-339-30964 | Highmark Energy Operating LLC | Montgomery, TXConroe (Middle Wilcox Cons.) | Temporarily abandonedGas | 13,194 | Jan 30, 2003 | — | — |
| South Texas Development Co. 1 #104P42-339-31038 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 1,820 | Jan 28, 2003 | — | — |
| Madeley AA & da #114P42-339-31036 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 2,045 | Jan 16, 2003 | — | — |
| Sullivan E. B. State #142-339-01859 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 5,154 | Jan 15, 2003 | — | — |
| Dobbins C. L. #104P42-339-31032 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. L) | Temporarily abandonedGas | 3,741 | Jan 9, 2003 | — | — |
| Dobbins C L #106P42-339-31034 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | ActiveWater Supply | 3,050 | Jan 9, 2003 | — | — |
| Crooks H . H. #242-195-31556 | Highmark Energy Operating LLC | Hansford, TXHansford (Morrow Lower) | ActiveGas | 8,656 | Jan 8, 2003 | — | — |
| Madeley AA & da #3242-339-00620 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 5,143 | Jan 6, 2003 | — | — |
| Madeley AA & da #108P42-339-31028 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 1,921 | Jan 3, 2003 | — | — |
| Madeley AA & da #111P42-339-31030 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. L) | Temporarily abandonedGas | 3,734 | Jan 3, 2003 | — | — |
| Madeley AA & da #110P42-339-31031 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 1,710 | Jan 3, 2003 | — | — |
| Dobbins C. L. #442-339-00634 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 5,139 | Dec 27, 2002 | — | — |
| Madeley AA & da #104P42-339-31026 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 1,750 | Dec 27, 2002 | — | — |
| South Texas Development Co. 1 #102P42-339-31027 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 1,550 | Dec 27, 2002 | — | — |
| Hansford GU 5 #242-195-31588 | Highmark Energy Operating LLC | Hansford, TXHansford (Morrow Upper) | Temporarily abandonedGas | 7,849 | Dec 19, 2002 | — | — |
| Dobbins C. L. #1342-339-00643 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. U) | Temporarily abandonedGas | 5,080 | Dec 19, 2002 | — | — |
| Hansford Gas Unit 17 #342-195-31527 | Highmark Energy Operating LLC | Hansford, TXHansford (Morrow Lower) | ActiveGas | 8,500 | Oct 31, 2002 | — | — |
| Taylor T. H. #342-195-31578 | Highmark Energy Operating LLC | Hansford, TXPan Petro (Cleveland) | Temporarily abandonedGas | 8,150 | Oct 2, 2002 | — | — |
| Conroe Field Unit #79D42-339-00618 | Highmark Energy Operating LLC | Montgomery, TXConroe | PluggedOil | 1,600 | Sep 5, 2002 | — | — |
| Hitchland Gas Unit 8 #342-195-31573 | Highmark Energy Operating LLC | Hansford, TXTexas Hugoton | Temporarily abandonedGas | 3,150 | Aug 29, 2002 | — | — |
| Moore H. N. #6842-339-31015 | Highmark Energy Operating LLC | Montgomery, TXConroe (Middle Wilcox Cons.) | Temporarily abandonedGas | 13,600 | Aug 28, 2002 | — | — |
| University -141- #1HZ42-003-05343 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | PluggedOil | 9,980 | Aug 19, 2002 | — | — |
| Prentice Northeast Unit #3542-445-00299 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 6,749 | Aug 12, 2002 | — | — |
| Jackson S. P. & K. K. #642-195-31570 | Highmark Energy Operating LLC | Hansford, TXTexas Hugoton | ActiveGas | 3,050 | Aug 7, 2002 | — | — |
| Prentice Northeast Unit #51942-445-31995 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,282 | Jul 31, 2002 | — | — |
| University I #142-003-30617 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Yates) | Temporarily abandonedGas | 6,956 | Jul 30, 2002 | — | — |
| Covington Ella B #1842-445-31986 | Highmark Energy Operating LLC | Terry, TXSuntura (Lower Clear Fork) | ActiveInjection | 8,516 | Jul 29, 2002 | — | — |
| Prentice Northeast Unit #56042-445-31988 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,430 | Jul 29, 2002 | — | — |
| Prentice Northeast Unit #56242-445-31989 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,425 | Jul 29, 2002 | — | — |
| Prentice Northeast Unit #55042-445-31990 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveInjection | 7,232 | Jul 29, 2002 | — | — |
| Prentice Northeast Unit #30042-445-31991 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,320 | Jul 29, 2002 | — | — |
| Prentice Northeast Unit #62242-445-31992 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | PluggedOil | 7,430 | Jul 29, 2002 | — | — |
| Prentice Northeast Unit #52242-445-31987 | Highmark Energy Operating LLC | Terry, TXPrentice (6700) | ActiveOil | 7,238 | Jul 26, 2002 | — | — |
| Alma #342-135-02436 | Highmark Energy Operating LLC | Ector, TXTXL North (Waddell) | PluggedOil | 9,420 | May 6, 2002 | — | — |
| Jackson #242-195-31561 | Highmark Energy Operating LLC | Hansford, TXTexas Hugoton | ActiveGas | 3,050 | May 2, 2002 | — | — |
| Hitchland Gas Unit 7 #242-195-31563 | Highmark Energy Operating LLC | Hansford, TXTexas Hugoton | Temporarily abandonedGas | 3,053 | Apr 23, 2002 | — | — |
| Conroe Field Unit #171242-339-00329 | Highmark Energy Operating LLC | Montgomery, TXConroe | Shut inOil | 5,160 | Apr 23, 2002 | — | — |
| Hitchland Gas Unit 8 #242-195-31564 | Highmark Energy Operating LLC | Hansford, TXHitchland (4640) | ActiveGas | 7,000 | Apr 16, 2002 | — | — |
| University C #142-003-01301 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (San Andres) | Shut inOil | 11,698 | Mar 12, 2002 | — | — |
| Wiggins-Athey Pooled Unit #342-339-00711 | Highmark Energy Operating LLC | Montgomery, TXConroe (Vicksburg) | Shut inOil | 5,171 | Jan 24, 2002 | — | — |
| Moody E. #3342-339-31007 | Highmark Energy Operating LLC | Montgomery, TXConroe (Cons. L) | Shut inOil | 3,800 | Dec 14, 2001 | — | — |
| Collier H. J. #142-195-00442 | Highmark Energy Operating LLC | Hansford, TXTexas Hugoton | Temporarily abandonedGas | 7,391 | Oct 19, 2001 | — | — |
| University San Andres Unit #23A42-003-38891 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (San Andres) | ActiveOil | 4,780 | Sep 20, 2001 | — | — |
| Shafter Lake Clearfork Unit #602142-003-38890 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (Clear Fork) | ActiveOil | 6,998 | Sep 19, 2001 | — | — |
| Williamson Unit #542-401-33146 | Highmark Energy Operating LLC | Rusk, TXOak Hill (Cotton Valley) | PluggedGas | 10,800 | Sep 6, 2001 | — | — |
| University San Andres Unit #11W42-003-38858 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (San Andres) | PluggedOil | 4,800 | Aug 16, 2001 | — | — |
| University San Andres Unit #12W42-003-38859 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (San Andres) | ActiveInjection | 4,795 | Aug 16, 2001 | — | — |
| University San Andres Unit #13W42-003-38860 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (San Andres) | ActiveInjection | 4,790 | Aug 16, 2001 | — | — |
| University San Andres Unit #19W42-003-38861 | Highmark Energy Operating LLC | Andrews, TXShafter Lake (San Andres) | PluggedOil | 4,800 | Aug 16, 2001 | — | — |