| 911530 | Nov 4, 2025 | Nov 4, 2025 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #44 | 3,000 | 10540097 |
| 911530Amendment | Nov 4, 2025 | Nov 4, 2025 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #44 | 3,170 | 10540097 |
| 900967 | Jul 18, 2024 | Jul 18, 2024 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #1 | 2,089 | 00000000 |
| 900964 | Jul 18, 2024 | Jul 18, 2024 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #M 35 | 2,176 | 10502282 |
| 892260 | Nov 17, 2023 | Nov 17, 2023 | Aspen Operating Company, L.L.C. | Crockett | Noelke Livestock Co M-O #502 | 2,433 | 10502212 |
| 892255 | Nov 14, 2023 | Nov 14, 2023 | Aspen Operating Company, L.L.C. | Crockett | Noelke Livestock Co OO #612 | 2,400 | 10535173 |
| 882058 | Jul 18, 2022 | Jul 18, 2022 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #15 | 2,900 | 10532511 |
| 818136 | Nov 16, 2016 | Nov 16, 2016 | Aspen Operating Company, L.L.C. | Crockett | Olson #613 | 2,415 | 10535145 |
| 771614 | Nov 1, 2013 | Nov 1, 2013 | Aspen Operating Company, L.L.C. | Pecos | Taylor-Link W. (San Andres Unit) #148 | 2,000 | 37106669 |
| 713612 | Apr 15, 2011 | Apr 15, 2011 | Aspen Operating Company, L.L.C. | Yoakum | S.A. Green et al "A" #1 | 9,510 | 50132377 |
| 713593 | Apr 15, 2011 | Apr 15, 2011 | Aspen Operating Company, L.L.C. | Crockett | M.R. Shannon Estate "O" #35 | 2,900 | 10541272 |
| 713593Amendment | Apr 15, 2011 | Apr 15, 2011 | Aspen Operating Company, L.L.C. | Crockett | M. A. Shannon Estate 'O' #35 | 2,900 | 10541272 |
| 713587 | Apr 15, 2011 | Apr 15, 2011 | Aspen Operating Company, L.L.C. | Crockett | M.R. Shannon Estate 'O' #34 | 3,000 | 10541271 |
| 710862 | Mar 4, 2011 | Mar 4, 2011 | Aspen Operating Company, L.L.C. | Yoakum | Lynndale #2 | 6,500 | 50133157 |
| 710231 | Feb 17, 2011 | Feb 17, 2011 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #20 | 2,900 | 10541256 |
| 700921 | Aug 20, 2010 | Aug 20, 2010 | Aspen Operating Company, L.L.C. | Crockett | Noelke Livestock 1940 #903 | 2,000 | 10502183 |
| 700715 | Aug 17, 2010 | Aug 17, 2010 | Aspen Operating Company, L.L.C. | Crockett | M. A. Shannon Estate 'O' #15 | 2,248 | 10502302 |
| 700181 | Aug 6, 2010 | Aug 6, 2010 | Aspen Operating Company, L.L.C. | Crockett | Noelke Livestock 1940 #312 | 2,400 | 10502235 |
| 697668 | Jun 18, 2010 | Jun 18, 2010 | Aspen Operating Company, L.L.C. | Crockett | Noelke Queen "20" #3 | 2,632 | 10537973 |
| 697022 | Jun 7, 2010 | Jun 7, 2010 | Aspen Operating Company, L.L.C. | Harris | Gulf Fee #4 | 4,400 | 20101320 |
| 697022Amendment | Jun 7, 2010 | Jun 7, 2010 | Aspen Operating Company, L.L.C. | Harris | Gulf Fee #4 | 4,400 | 20101320 |
| 697022Amendment | Jun 7, 2010 | Jun 7, 2010 | Aspen Operating Company, L.L.C. | Harris | Gulf Fee #4 | 4,400 | 20101320 |
| 688148 | Jan 12, 2010 | Jan 12, 2010 | Aspen Operating Company, L.L.C. | Crockett | Olson Unit #301 | 3,000 | 10502211 |
| 689065 | Dec 30, 2009 | Dec 30, 2009 | Aspen Operating Company, L.L.C. | Crockett | M.A. Shannon Estate "O" #33 | 2,900 | 10541075 |
| 689065Amendment | Dec 30, 2009 | Dec 30, 2009 | Aspen Operating Company, L.L.C. | Crockett | M.R. Shannon Estate "O" #33 | 2,900 | 10541075 |
| 689065Amendment | Dec 30, 2009 | Dec 30, 2009 | Aspen Operating Company, L.L.C. | Crockett | M.A. Shannon Estate 'O' #33 | 2,900 | 10541075 |
| 688257 | Dec 8, 2009 | Dec 8, 2009 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate -M- 1 #21 | 2,900 | 10538810 |
| 687682 | Nov 25, 2009 | Nov 25, 2009 | Aspen Operating Company, L.L.C. | Jack | Loving, J. W. Estate #12 | 5,236 | 23736911 |
| 686706 | Nov 10, 2009 | Nov 10, 2009 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #19 | 2,900 | 10541029 |
| 685761 | Oct 9, 2009 | Oct 9, 2009 | Aspen Operating Company, L.L.C. | Crockett | Noelke "20" #5 | 2,900 | 10541008 |
| 677344 | May 27, 2009 | May 27, 2009 | Aspen Operating Company, L.L.C. | Wise | Alvord, S. (Caddo Congl.) Unit #1301 | 6,000 | 49732743 |
| 669330Amendment | Feb 18, 2009 | Feb 18, 2009 | Aspen Operating Company, L.L.C. | Clay | Cleveland Heirs #1 | 6,395 | 07702250 |
| 677701 | Jan 27, 2009 | Jan 27, 2009 | Aspen Operating Company, L.L.C. | Clay | Cleveland, William D. #1W | 6,400 | 07702249 |
| 669330 | Dec 23, 2008 | Dec 23, 2008 | Aspen Operating Company, L.L.C. | Clay | Cleaveland Heirs #1 | 6,395 | 07702250 |
| 669330Amendment | Dec 23, 2008 | Dec 23, 2008 | Aspen Operating Company, L.L.C. | Clay | Cleveland Heirs #1 | 6,395 | 07702250 |
| 675312 | Dec 3, 2008 | Dec 3, 2008 | Aspen Operating Company, L.L.C. | Crockett | Noelke "20" #4 | 2,900 | 10537975 |
| 668374 | Nov 12, 2008 | Nov 12, 2008 | Aspen Operating Company, L.L.C. | Jack | J. W. Loving Estate #2 | 4,900 | 23733185 |
| 673805 | Oct 30, 2008 | Oct 30, 2008 | Aspen Operating Company, L.L.C. | Jack | Peavy, S. H. Jr. #4 | 4,350 | 23734560 |
| 671747 | Oct 10, 2008 | Oct 10, 2008 | Aspen Operating Company, L.L.C. | Jack | Peavy #1 | 4,597 | 23735055 |
| 671376 | Oct 3, 2008 | Oct 3, 2008 | Aspen Operating Company, L.L.C. | Crockett | Olson Unit #411 | 2,600 | 10502232 |
| 671376Amendment | Oct 3, 2008 | Oct 3, 2008 | Aspen Operating Company, L.L.C. | Crockett | Noelke Livestock 1940 #411 | 2,600 | 10502232 |
| 668734 | Sep 2, 2008 | Sep 2, 2008 | Aspen Operating Company, L.L.C. | Yoakum | Lynndale #2 | 9,200 | 50133157 |
| 668727 | Aug 29, 2008 | Aug 29, 2008 | Aspen Operating Company, L.L.C. | Crockett | Olson Unit #812 | 1,979 | 10502201 |
| 668505 | Aug 26, 2008 | Aug 26, 2008 | Aspen Operating Company, L.L.C. | Jack | Loving, J. W. Estate #9 | 4,950 | 23733540 |
| 658712 | Apr 17, 2008 | Apr 17, 2008 | Aspen Operating Company, L.L.C. | Crockett | Shannon Estate #3 | 2,600 | 10502989 |
| 649599 | Nov 20, 2007 | Nov 20, 2007 | Aspen Operating Company, L.L.C. | Crockett | Double Eagle 4 #1 | 6,500 | 10540480 |
| 635813 | Mar 30, 2007 | Mar 30, 2007 | Aspen Operating Company, L.L.C. | Wise | Wyatt Earp Federal #1 | 6,500 | 49736236 |
| 635813Amendment | Mar 30, 2007 | Mar 30, 2007 | Aspen Operating Company, L.L.C. | Wise | Wyatt Earp Federal #1 | 6,500 | 49736236 |
| 632682 | Feb 2, 2007 | Feb 2, 2007 | Aspen Operating Company, L.L.C. | Wise | Octodog #9 | 6,500 | 49700552 |
| 630947 | Dec 27, 2006 | Dec 27, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #7 | 6,300 | 49732174 |
| 629987 | Dec 5, 2006 | Dec 5, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #6 | 6,520 | 49733710 |
| 629176 | Nov 20, 2006 | Nov 20, 2006 | Aspen Operating Company, L.L.C. | Jack | John Pursley #1 | 5,851 | 23730080 |
| 629044 | Nov 16, 2006 | Nov 16, 2006 | Aspen Operating Company, L.L.C. | Wise | Alvord South (Caddo Congl. Unit) #701 | 6,200 | 49700081 |
| 628895 | Nov 13, 2006 | Nov 13, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #5 | 6,500 | 49732086 |
| 628895Amendment | Nov 13, 2006 | Nov 13, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #5 | 6,500 | 49732086 |
| 627848 | Oct 20, 2006 | Oct 20, 2006 | Aspen Operating Company, L.L.C. | Wise | Caughlin Strawn (East Seg.) Unit #1603 | 3,980 | 49700822 |
| 627183 | Oct 11, 2006 | Oct 11, 2006 | Aspen Operating Company, L.L.C. | Wise | East Unit #301 | 6,540 | 49700015 |
| 626756 | Sep 29, 2006 | Sep 29, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #4 | 6,775 | 49732559 |
| 626756Amendment | Sep 29, 2006 | Sep 29, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #4 | 6,775 | 49732559 |
| 625261 | Sep 5, 2006 | Sep 5, 2006 | Aspen Operating Company, L.L.C. | Wise | Caughlin Strawn (East Seg) Unit #401 | 4,057 | 49701236 |
| 625156 | Aug 29, 2006 | Aug 29, 2006 | Aspen Operating Company, L.L.C. | Wise | Caughlin Strawn (East Seg) Unit #1701 | 6,075 | 49701019 |
| 623392 | Jul 28, 2006 | Jul 28, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #3 | 6,500 | 49731770 |
| 623392Amendment | Jul 28, 2006 | Jul 28, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #3 | 6,500 | 49731770 |
| 620567 | Jun 7, 2006 | Jun 7, 2006 | Aspen Operating Company, L.L.C. | Pecos | Big Mesa #1 | 7,500 | 37137741 |
| 615679 | Apr 6, 2006 | Apr 6, 2006 | Aspen Operating Company, L.L.C. | Crockett | M. A. Shannon Estate "O" #12 | 2,700 | 10502296 |
| 614644 | Feb 27, 2006 | Feb 27, 2006 | Aspen Operating Company, L.L.C. | Wise | Ponder, Stella #1 | 5,720 | 49701905 |
| 614581 | Feb 27, 2006 | Feb 27, 2006 | Aspen Operating Company, L.L.C. | Wise | Nunley, C. L. #2 | 6,264 | 49731607 |
| 614302 | Feb 23, 2006 | Feb 23, 2006 | Aspen Operating Company, L.L.C. | Wise | Poteet #2 | 5,774 | 49701893 |
| 614163 | Feb 21, 2006 | Feb 21, 2006 | Aspen Operating Company, L.L.C. | Wise | Hutchinson -B- #5 | 5,900 | 49731591 |
| 614094 | Feb 21, 2006 | Feb 21, 2006 | Aspen Operating Company, L.L.C. | Wise | Flavis Greer #3 | 5,920 | 49702626 |
| 612489 | Jan 17, 2006 | Jan 17, 2006 | Aspen Operating Company, L.L.C. | Wise | Octodog #2 | 6,405 | 49732070 |
| 609588 | Nov 16, 2005 | Nov 16, 2005 | Aspen Operating Company, L.L.C. | Wise | Hamilton, Annie #1 | 5,800 | 49701117 |
| 609374 | Nov 14, 2005 | Nov 14, 2005 | Aspen Operating Company, L.L.C. | Wise | Hutchinson "B" #4 | 5,800 | 49700636 |
| 608188 | Oct 19, 2005 | Oct 19, 2005 | Aspen Operating Company, L.L.C. | Crockett | Double Eagle 4 #1 | 6,500 | 10540480 |
| 603136 | Jul 8, 2005 | Jul 8, 2005 | Aspen Operating Company, L.L.C. | Wise | Octodog #1 | 6,500 | 49732098 |
| 602920 | Jul 5, 2005 | Jul 5, 2005 | Aspen Operating Company, L.L.C. | Wise | Alvord South (Caddo Cong) Unit #901W | 2,330 | 49730181 |
| 561111Amendment | Jun 23, 2005 | Jun 23, 2005 | Aspen Operating Company, L.L.C. | Jack | Yates, Fayette #42 | 5,800 | 23738857 |
| 602339 | Jun 21, 2005 | Jun 21, 2005 | Aspen Operating Company, L.L.C. | Wise | Davis, T.E. #6 | 5,800 | 49735863 |
| 602339Amendment | Jun 21, 2005 | Jun 21, 2005 | Aspen Operating Company, L.L.C. | Wise | Davis, T. E. #6 | 6,250 | 49735863 |
| 561112 | May 24, 2005 | May 24, 2005 | Aspen Operating Company, L.L.C. | Jack | Yates, Fayette #41 | 5,800 | 23738858 |
| 561111 | May 13, 2005 | May 13, 2005 | Aspen Operating Company, L.L.C. | Jack | Yates, Fayette #42 | 5,800 | 23738857 |
| 556750 | Feb 3, 2005 | Feb 3, 2005 | Aspen Operating Company, L.L.C. | Jack | Cherryhomes, T. H. #7 | 7,200 | 23738844 |
| 556750Amendment | Feb 3, 2005 | Feb 3, 2005 | Aspen Operating Company, L.L.C. | Jack | Cherryhomes, T. H. #7 | 7,200 | 23738844 |
| 556750Amendment | Feb 3, 2005 | Feb 3, 2005 | Aspen Operating Company, L.L.C. | Jack | Cherryhomes, T. H. #7 | 7,200 | 23738844 |
| 556434 | Jan 19, 2005 | Jan 19, 2005 | Aspen Operating Company, L.L.C. | Jack | Durham "B" #6 | 7,200 | 23738841 |
| 556434Amendment | Jan 19, 2005 | Jan 19, 2005 | Aspen Operating Company, L.L.C. | Jack | Durham "B" #6 | 7,200 | 23738841 |
| 554138 | Nov 29, 2004 | Nov 29, 2004 | Aspen Operating Company, L.L.C. | Jack | Yates, Billie #36 | 7,500 | 23738823 |
| 554137 | Nov 29, 2004 | Nov 29, 2004 | Aspen Operating Company, L.L.C. | Wise | Cap Yates #26 | 7,500 | 49735738 |
| 554137Amendment | Nov 29, 2004 | Nov 29, 2004 | Aspen Operating Company, L.L.C. | Wise | Cap Yates #26 | 7,500 | 49735738 |
| 554136 | Nov 29, 2004 | Nov 29, 2004 | Aspen Operating Company, L.L.C. | Jack | Yates, Fayette #43 | 7,500 | 23738824 |
| 551665 | Nov 12, 2004 | Nov 12, 2004 | Aspen Operating Company, L.L.C. | Gaines | Allen W Byrd Unit #2 | 4,000 | 16536235 |
| 552828 | Nov 1, 2004 | Nov 1, 2004 | Aspen Operating Company, L.L.C. | Wise | Caughlin Strawn East Unit #905 | 4,100 | 49735719 |
| 552827 | Nov 1, 2004 | Nov 1, 2004 | Aspen Operating Company, L.L.C. | Wise | Caughlin Strawn East Unit #904 | 4,100 | 49735718 |
| 549812 | Sep 23, 2004 | Sep 23, 2004 | Aspen Operating Company, L.L.C. | Crane | Judkins Gas Pro Unit III #11 | 4,700 | 10335032 |
| 549813 | Sep 22, 2004 | Sep 22, 2004 | Aspen Operating Company, L.L.C. | Crane | Judkins Gas Pro Unit III #12 | 4,700 | 10335033 |
| 548984 | Sep 22, 2004 | Sep 22, 2004 | Aspen Operating Company, L.L.C. | Crane | Judkins Gas Pro Unit II #12 | 4,700 | 10335026 |
| 548983 | Sep 8, 2004 | Sep 8, 2004 | Aspen Operating Company, L.L.C. | Crane | Judkins Gas Pro Unit II #13 | 4,700 | 10335025 |
| 547538 | Jul 30, 2004 | Jul 30, 2004 | Aspen Operating Company, L.L.C. | Crane | Judkins Gas Pro Unit II #11 | 4,700 | 10335023 |
| 523280 | Sep 30, 2002 | Sep 30, 2002 | Aspen Operating Company, L.L.C. | Crane | Judkins Gas Proration Unit II #10 | 4,690 | 10331079 |
| 505154 | Feb 9, 2001 | Feb 9, 2001 | Aspen Operating Company, L.L.C. | Pecos | Parke #3A | 8,500 | 37136926 |