| 635700 | Mar 22, 2007 | Mar 22, 2007 | Square One Energy, Inc. | Hogtown - Moore Unit #3114 | 3,100 | 14331209 |
| 634803 | Mar 14, 2007 | Mar 14, 2007 | Square One Energy, Inc. | Hogtown Moore Unit #3112 | 4,000 | 14331207 |
| 634594 | Mar 12, 2007 | Mar 12, 2007 | Carrizo Oil & Gas, Inc. | Wilson, N. #1HH | 7,500 | 14331206 |
| 633759 | Feb 23, 2007 | Feb 23, 2007 | Dart Oil & Gas Corporation | McDaniel Ranch-Faris Unit #1HH | 3,920 | 14331205 |
| 632950 | Feb 7, 2007 | Feb 7, 2007 | Quicksilver Resources Inc. | Emma Jean #3HH | 6,600 | 14331204 |
| 632899 | Feb 6, 2007 | Feb 6, 2007 | Infinity Oil & Gas of TX, Inc. | Golightly #1SD | 7,000 | 14331203 |
| 632899Amendment | Feb 6, 2007 | Feb 6, 2007 | Infinity Oil & Gas of TX, Inc. | Golightly #1SD | 7,000 | 14331203 |
| 632329 | Jan 25, 2007 | Jan 25, 2007 | EOG Resources, Inc. | Houston Ranch #12HH | 5,300 | 14331202 |
| 632329Amendment | Jan 25, 2007 | Jan 25, 2007 | EOG Resources, Inc. | Houston Ranch #12HH | 5,500 | 14331202 |
| 631628 | Jan 24, 2007 | Jan 24, 2007 | Square One Energy, Inc. | Hogtown Moore Unit #3107 | 4,000 | 14331194 |
| 631623 | Jan 24, 2007 | Jan 24, 2007 | Square One Energy, Inc. | Hogtown-Moore Unit #3110 | 4,000 | 14331197 |
| 631617 | Jan 24, 2007 | Jan 24, 2007 | Square One Energy, Inc. | Hogtown Moore Unit #3108 | 4,000 | 14331195 |
| 631614 | Jan 24, 2007 | Jan 24, 2007 | Square One Energy, Inc. | Hogtown Moore Unit #3109 | 4,000 | 14331196 |
| 632072 | Jan 22, 2007 | Jan 22, 2007 | EOG Resources, Inc. | Houston Ranch #17HH | 5,300 | 14331201 |
| 632067 | Jan 22, 2007 | Jan 22, 2007 | EOG Resources, Inc. | Keith Unit #1HH | 5,000 | 14331200 |
| 631917 | Jan 18, 2007 | Jan 18, 2007 | EOG Resources, Inc. | Houston Ranch #18HH | 5,300 | 14331199 |
| 631910 | Jan 18, 2007 | Jan 18, 2007 | EOG Resources, Inc. | Houston Ranch #16HH | 5,300 | 14331198 |
| 631210 | Jan 4, 2007 | Jan 4, 2007 | Dte Gas Resources, Inc. | Fambro 288 #2 | 6,000 | 14331192 |
| 631236 | Jan 3, 2007 | Jan 3, 2007 | EOG Resources, Inc. | Houston Ranch #13HH | 5,300 | 14331193 |
| 630812 | Dec 20, 2006 | Dec 20, 2006 | EOG Resources, Inc. | Keith Unit #2 | 5,500 | 14331191 |
| 630713 | Dec 19, 2006 | Dec 19, 2006 | EOG Resources, Inc. | Houston Ranch #14HH | 5,300 | 14331190 |
| 628837 | Dec 4, 2006 | Dec 4, 2006 | Square One Energy, Inc. | Hogtown-Moore Unit #E 19 | 4,000 | 14331189 |
| 628836 | Dec 4, 2006 | Dec 4, 2006 | Square One Energy, Inc. | Hogtown-Moore Unit #E 18 | 4,000 | 14331188 |
| 629597 | Nov 29, 2006 | Nov 29, 2006 | Devon Energy Production Co, L.P. | Mulloy #1HH | 9,000 | 14331187 |
| 629060 | Nov 22, 2006 | Nov 22, 2006 | Dte Gas Resources, Inc. | Howle #1HH | 6,000 | 14331184 |
| 628826 | Nov 17, 2006 | Nov 17, 2006 | Square One Energy, Inc. | Hogtown-Moore Unit #E 12 | 4,000 | 14331186 |
| 628825 | Nov 16, 2006 | Nov 16, 2006 | Square One Energy, Inc. | Hogtown-Moore Unit #E 11 | 4,000 | 14331185 |
| 628730 | Nov 8, 2006 | Nov 8, 2006 | Dart Oil & Gas Corporation | McDaniel Ranch Unit #1HH | 4,000 | 14331183 |
| 628488 | Nov 2, 2006 | Nov 2, 2006 | EOG Resources, Inc. | Bishop #3HH | 5,500 | 14331182 |
| 628386 | Nov 1, 2006 | Nov 1, 2006 | Dte Gas Resources, Inc. | Howle #2HH | 6,000 | 14331181 |
| 627541 | Oct 16, 2006 | Oct 16, 2006 | EOG Resources, Inc. | JLB Ranch #4HH | 5,000 | 14331180 |
| 627541Amendment | Oct 16, 2006 | Oct 16, 2006 | EOG Resources, Inc. | JLB Ranch #4HH | 5,000 | 14331180 |
| 627232 | Oct 10, 2006 | Oct 10, 2006 | EOG Resources, Inc. | JLB Ranch #3HH | 5,000 | 14331179 |
| 626780 | Oct 6, 2006 | Oct 6, 2006 | Square One Energy, Inc. | Desdemona Field Unit #E 3 | 4,000 | 14331177 |
| 626771 | Oct 6, 2006 | Oct 6, 2006 | Square One Energy, Inc. | Hogtown-Moore #E 10 | 3,700 | 14331178 |
| 626213 | Sep 27, 2006 | Sep 27, 2006 | Cumming Company, Inc. The | Sterling #1 | 5,000 | 14331175 |
| 626555 | Sep 26, 2006 | Sep 26, 2006 | EOG Resources, Inc. | Warren Unit #1HH | 5,500 | 14331176 |
| 626555Amendment | Sep 26, 2006 | Sep 26, 2006 | EOG Resources, Inc. | Warren Unit #1HH | 5,500 | 14331176 |
| 626049 | Sep 22, 2006 | Sep 22, 2006 | Cumming Company, Inc. The | Sterling #2 | 5,000 | 14331174 |
| 626049Amendment | Sep 22, 2006 | Sep 22, 2006 | Cumming Company, Inc. The | Sterling #2 | 5,000 | 14331174 |
| 625748 | Sep 12, 2006 | Sep 12, 2006 | Infinity Oil & Gas of TX, Inc. | Bledsoe-Murray #1HH | 4,500 | 14331173 |
| 625726 | Sep 11, 2006 | Sep 11, 2006 | Dart Oil & Gas Corporation | McDaniel Ranch #1P | 5,000 | 14331172 |
| 625726Amendment | Sep 11, 2006 | Sep 11, 2006 | Dart Oil & Gas Corporation | McDaniel Ranch Unit #1P | 5,000 | 14331172 |
| 625481 | Sep 6, 2006 | Sep 6, 2006 | Infinity Oil & Gas of TX, Inc. | Bailey-Fagan #1HH | 4,300 | 14331171 |
| 625429 | Sep 6, 2006 | Sep 6, 2006 | Infinity Oil & Gas of TX, Inc. | Koemel #2HH | 4,300 | 14331170 |
| 625425 | Sep 6, 2006 | Sep 6, 2006 | Infinity Oil & Gas of TX, Inc. | Grimes-Huffman #2HH | 4,300 | 14331169 |
| 625276 | Aug 31, 2006 | Aug 31, 2006 | Cholla Petroleum, Inc. | Carlton #3 | 4,999 | 14331168 |
| 625128 | Aug 29, 2006 | Aug 29, 2006 | Cholla Petroleum, Inc. | Carlton #2 | 4,999 | 14331167 |
| 624864 | Aug 24, 2006 | Aug 24, 2006 | Infinity Oil & Gas of TX, Inc. | Miller-Black #1HH | 4,300 | 14331166 |
| 624864Amendment | Aug 24, 2006 | Aug 24, 2006 | Infinity Oil & Gas of TX, Inc. | Miller-Black #1HH | 4,300 | 14331166 |
| 624570 | Aug 23, 2006 | Aug 23, 2006 | Denbury Onshore, LLC | Huffman #1HH | 6,000 | 14331165 |
| 624564 | Aug 18, 2006 | Aug 18, 2006 | Denbury Onshore, LLC | Bens #1HH | 5,500 | 14331164 |
| 624498 | Aug 17, 2006 | Aug 17, 2006 | Infinity Oil & Gas of TX, Inc. | Bonnie-Dee #2HH | 4,300 | 14331163 |
| 624386 | Aug 15, 2006 | Aug 15, 2006 | Infinity Oil & Gas of TX, Inc. | Murray #1HH | 4,300 | 14331162 |
| 624386Amendment | Aug 15, 2006 | Aug 15, 2006 | Infinity Oil & Gas of TX, Inc. | Murray #1HH | 4,300 | 14331162 |
| 623721 | Aug 9, 2006 | Aug 9, 2006 | EOG Resources, Inc. | Bishop SWD #1 | 9,000 | 14331158 |
| 624015 | Aug 8, 2006 | Aug 8, 2006 | Quicksilver Resources Inc. | Emma Jean #2HH | 6,400 | 14331160 |
| 624012 | Aug 8, 2006 | Aug 8, 2006 | Quicksilver Resources Inc. | Emma Jean #1HH | 6,400 | 14331161 |
| 623998 | Aug 8, 2006 | Aug 8, 2006 | Denbury Onshore, LLC | Bens #1P | 5,200 | 14331159 |
| 623816 | Aug 3, 2006 | Aug 3, 2006 | EOG Resources, Inc. | Bishop #4 | 6,000 | 14331157 |
| 622781 | Jul 18, 2006 | Jul 18, 2006 | Carrizo Oil & Gas, Inc. | Davis #1HH | 7,500 | 14331156 |
| 622509 | Jul 18, 2006 | Jul 18, 2006 | EOG Resources, Inc. | Huckabee #1HH | 5,300 | 14331155 |
| 622299 | Jul 14, 2006 | Jul 14, 2006 | Square One Energy, Inc. | Hogtown Moore Unit #3201 | 3,700 | 14330827 |
| 621906 | Jul 13, 2006 | Jul 13, 2006 | Great Northern Energy Inc. | Alford #1HH | 6,400 | 14331153 |
| 621905 | Jul 13, 2006 | Jul 13, 2006 | Great Northern Energy Inc. | Corbell #1HH | 6,400 | 14331152 |
| 622252 | Jul 10, 2006 | Jul 10, 2006 | EOG Resources, Inc. | Good Living Trust #2 | 5,500 | 14331154 |
| 621885 | Jul 5, 2006 | Jul 5, 2006 | Great Northern Energy Inc. | Gne Scholtz #1HH | 6,400 | 14331150 |
| 621885Amendment | Jul 5, 2006 | Jul 5, 2006 | Wildhorse Energy Co. | Gne Scholtz #1HH | 3,900 | 14331150 |
| 621883 | Jul 3, 2006 | Jul 3, 2006 | Great Northern Energy Inc. | Gne #1 S | 6,400 | 14331151 |
| 621293 | Jun 26, 2006 | Jun 26, 2006 | Blackwater Oil & Gas Corporation | Huffman 'B' #1 | 3,940 | 14300044 |
| 621293Amendment | Jun 26, 2006 | Jun 26, 2006 | Blackwater Oil & Gas Corporation | Huffman 'B' #1 | 3,940 | 14300044 |
| 621171 | Jun 23, 2006 | Jun 23, 2006 | EOG Resources, Inc. | Bishop #2HH | 5,200 | 14331149 |
| 621171Amendment | Jun 23, 2006 | Jun 23, 2006 | EOG Resources, Inc. | Bishop #2HH | 6,000 | 14331149 |
| 621171Amendment | Jun 23, 2006 | Jun 23, 2006 | EOG Resources, Inc. | Bishop #2HH | 6,000 | 14331149 |
| 621169 | Jun 21, 2006 | Jun 21, 2006 | EOG Resources, Inc. | Bishop a Unit #1HH | 5,200 | 14331148 |
| 621102 | Jun 20, 2006 | Jun 20, 2006 | EOG Resources, Inc. | Houston Ranch #15HH | 5,500 | 14331146 |
| 621247 | Jun 19, 2006 | Jun 19, 2006 | Reichmann Petroleum Corp. | Schillingburg #1HH | 6,000 | 14331147 |
| 621247Amendment | Jun 19, 2006 | Jun 19, 2006 | R.p.wilson, Inc. | Shillingburg #1 | 3,652 | 14331147 |
| 620901 | Jun 14, 2006 | Jun 14, 2006 | EOG Resources, Inc. | Yancy Unit #1HH | 5,600 | 14331145 |
| 620694 | Jun 13, 2006 | Jun 13, 2006 | EOG Resources, Inc. | Stasey #1HH | 5,200 | 14331144 |
| 620644 | Jun 9, 2006 | Jun 9, 2006 | Quicksilver Resources Inc. | Mockingbird #2HH | 6,200 | 14331142 |
| 620655 | Jun 8, 2006 | Jun 8, 2006 | Reichmann Petroleum Corp. | Crouch #1HH | 5,000 | 14331143 |
| 620655Amendment | Jun 8, 2006 | Jun 8, 2006 | R.p.wilson, Inc. | Crouch #1HH | 6,164 | 14331143 |
| 620513 | Jun 8, 2006 | Jun 8, 2006 | Denbury Onshore, LLC | Allen #1HH | 7,100 | 14331141 |
| 620321 | Jun 2, 2006 | Jun 2, 2006 | Majestic Consulting, LC | Lipan SWD #1 | 10,000 | 14331140 |
| 620321Amendment | Jun 2, 2006 | Jun 2, 2006 | Majestic Consulting, LC | Lipan SWD #1 | 10,000 | 14331140 |
| 619968 | Jun 2, 2006 | Jun 2, 2006 | EOG Resources, Inc. | Bishop C Unit #1HH | 5,200 | 14331139 |
| 620040 | May 31, 2006 | May 31, 2006 | Quicksilver Resources Inc. | Petey #1HH | 6,400 | 14331138 |
| 618101 | May 16, 2006 | May 16, 2006 | Infinity Oil & Gas of TX, Inc. | McGee #1HH | 4,300 | 14331137 |
| 619212 | May 15, 2006 | May 15, 2006 | Quicksilver Resources Inc. | Mockingbird #1HH | 6,400 | 14331136 |
| 618775 | May 12, 2006 | May 12, 2006 | EOG Resources, Inc. | Houston Ranch #11HH | 5,400 | 14331135 |
| 618799 | May 5, 2006 | May 5, 2006 | Infinity Oil & Gas of TX, Inc. | Grimes-Huffman #1HH | 4,300 | 14331134 |
| 618773 | May 5, 2006 | May 5, 2006 | Reichmann Petroleum Corp. | Kranenburg #1 | 10,000 | 14331133 |
| 618773Amendment | May 5, 2006 | May 5, 2006 | Reichmann Petroleum Corp. | Kranenburg #1HH | 10,000 | 14331133 |
| 618773Amendment | May 5, 2006 | May 5, 2006 | Carrizo Oil & Gas, Inc. | Kranenburg Unit #1HH | 10,000 | 14331133 |
| 618133 | May 2, 2006 | May 2, 2006 | EOG Resources, Inc. | Parker, Fred #1HH | 5,100 | 14331132 |
| 618133Amendment | May 2, 2006 | May 2, 2006 | EOG Resources, Inc. | Parker, Fred #1HH | 5,400 | 14331132 |
| 618131 | May 2, 2006 | May 2, 2006 | EOG Resources, Inc. | Cameron Minerals Trust #1HH | 5,100 | 14331131 |
| 618131Amendment | May 2, 2006 | May 2, 2006 | EOG Resources, Inc. | Cameron Minerals Trust #1HH | 5,200 | 14331131 |
| 618131Amendment | May 2, 2006 | May 2, 2006 | EOG Resources, Inc. | Cameron Minerals Trust #1HH | 7,000 | 14331131 |