| 720662 | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #4HH | 9,000 | 49737339 |
| 720662Amendment | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #4HH | 9,000 | 49737339 |
| 720660 | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #3HH | 9,000 | 49737338 |
| 720660Amendment | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #3HH | 9,000 | 49737338 |
| 720657 | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #2HH | 9,000 | 49737337 |
| 720657Amendment | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #2HH | 9,000 | 49737337 |
| 720654 | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #1HH | 9,000 | 49737336 |
| 720654Amendment | Jul 29, 2011 | Jul 29, 2011 | Pioneer Natural Res. USA, Inc. | Locke Unit #1HH | 9,000 | 49737336 |
| 720367 | Jul 27, 2011 | Jul 27, 2011 | Devon Energy Production Co, L.P. | Young A-Young, B (SA) 'A' #1HH | 9,000 | 49737334 |
| 720727 | Jul 25, 2011 | Jul 25, 2011 | Tema Oil and Gas Company | R. Scott #2HH | 10,500 | 49737333 |
| 720727Amendment | Jul 25, 2011 | Jul 25, 2011 | Tema Oil and Gas Company | R. Scott #2HH | 10,500 | 49737333 |
| 720594 | Jul 25, 2011 | Jul 25, 2011 | Strata Operating, Inc. | Hydro-FX #1 | 10,500 | 49735728 |
| 720459 | Jul 25, 2011 | Jul 25, 2011 | Enervest Operating, L.L.C. | Sr Hill #4H | 9,000 | 49737332 |
| 720238 | Jul 22, 2011 | Jul 22, 2011 | Devon Energy Production Co, L.P. | Wcco 7 - J.T. Meadows #1HH | 9,000 | 49737331 |
| 720420 | Jul 21, 2011 | Jul 21, 2011 | Braden Exploration, LLC | Sandford Gas Unit #1HH | 9,000 | 49737330 |
| 720420Amendment | Jul 21, 2011 | Jul 21, 2011 | Braden Exploration, LLC | Sandford Gas Unit #1HH | 9,000 | 49737330 |
| 720420Amendment | Jul 21, 2011 | Jul 21, 2011 | Enervest Operating, L.L.C. | Sandford Gas Unit #1HH | 9,000 | 49737330 |
| 720202 | Jul 15, 2011 | Jul 15, 2011 | Devon Energy Production Co, L.P. | Perkins (D)-Pavillard a (SA) 'A' #1HH | 9,000 | 49737329 |
| 719936 | Jul 12, 2011 | Jul 12, 2011 | Tema Oil and Gas Company | Keller #1HH | 6,840 | 49737328 |
| 719387 | Jul 7, 2011 | Jul 7, 2011 | Encana Oil & Gas(usa) Inc. | Carter, B.S. Jr #8HH | 9,000 | 49737327 |
| 719386 | Jul 7, 2011 | Jul 7, 2011 | Encana Oil & Gas(usa) Inc. | Carter, B.S. Jr #7HH | 9,000 | 49737326 |
| 719377 | Jul 7, 2011 | Jul 7, 2011 | Encana Oil & Gas(usa) Inc. | Carter, B.S. Jr #6HH | 9,000 | 49737325 |
| 719480 | Jul 5, 2011 | Jul 5, 2011 | Enervest Operating, L.L.C. | Sr Hill #3H | 9,000 | 49737324 |
| 719335 | Jun 30, 2011 | Jun 30, 2011 | Braden Exploration, LLC | Derek Vollintine #1HH | 9,000 | 49737323 |
| 718927 | Jun 28, 2011 | Jun 28, 2011 | Vantage Fort Worth Energy LLC | Conley Heirs #7HH | 7,500 | 49737321 |
| 718922 | Jun 28, 2011 | Jun 28, 2011 | Vantage Fort Worth Energy LLC | Conley Heirs #6HH | 7,500 | 49737322 |
| 718810 | Jun 27, 2011 | Jun 27, 2011 | Pioneer Natural Res. USA, Inc. | Mattix Unit #3HH | 9,000 | 49737320 |
| 718806 | Jun 27, 2011 | Jun 27, 2011 | Pioneer Natural Res. USA, Inc. | Mattix Unit #2HH | 9,000 | 49737319 |
| 718806Amendment | Jun 27, 2011 | Jun 27, 2011 | Pioneer Natural Res. USA, Inc. | Mattix Unit #2HH | 9,000 | 49737319 |
| 718803 | Jun 27, 2011 | Jun 27, 2011 | Pioneer Natural Res. USA, Inc. | Mattix Unit #1HH | 9,000 | 49737318 |
| 718803Amendment | Jun 27, 2011 | Jun 27, 2011 | Pioneer Natural Res. USA, Inc. | Mattix Unit #1HH | 9,000 | 49737318 |
| 718420 | Jun 23, 2011 | Jun 23, 2011 | Burlington Resources O & G Co LP | Rock Ranch Unit #11HH | 9,000 | 49737317 |
| 718345 | Jun 21, 2011 | Jun 21, 2011 | Burlington Resources O & G Co LP | Rock Ranch B Unit #1HH | 9,000 | 49737316 |
| 718318 | Jun 21, 2011 | Jun 21, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #8HH | 9,000 | 49737315 |
| 718318Amendment | Jun 21, 2011 | Jun 21, 2011 | Burlington Resources O & G Co LP | Forsythe Speer Unit #8HH | 9,000 | 49737315 |
| 718318Amendment | Jun 21, 2011 | Jun 21, 2011 | Burlington Resources O & G Co LP | Forsythe Speer Unit #8HH | 9,000 | 49737315 |
| 718312 | Jun 21, 2011 | Jun 21, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #7HH | 9,000 | 49737314 |
| 718237 | Jun 17, 2011 | Jun 17, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #10HH | 9,000 | 49737313 |
| 718344 | Jun 16, 2011 | Jun 16, 2011 | Devon Energy Production Co, L.P. | Tinney Unit #1HH | 9,000 | 49737312 |
| 718344Amendment | Jun 16, 2011 | Jun 16, 2011 | Devon Energy Production Co, L.P. | Tinney Unit #1HH | 9,000 | 49737312 |
| 718342 | Jun 16, 2011 | Jun 16, 2011 | Devon Energy Production Co, L.P. | S. A. Jewell #1HH | 9,000 | 49737311 |
| 718342Amendment | Jun 16, 2011 | Jun 16, 2011 | Devon Energy Production Co, L.P. | S. A. Jewell #1HH | 9,000 | 49737311 |
| 717720 | Jun 15, 2011 | Jun 15, 2011 | Burlington Resources O & G Co LP | Forsythe Pryor B Unit #9HH | 9,000 | 49737310 |
| 717720Amendment | Jun 15, 2011 | Jun 15, 2011 | Burlington Resources O & G Co LP | Forsythe Pryor B Unit #9HH | 9,000 | 49737310 |
| 717718 | Jun 15, 2011 | Jun 15, 2011 | Burlington Resources O & G Co LP | Forsythe Pryor B Unit #5HH | 9,000 | 49737309 |
| 717718Amendment | Jun 15, 2011 | Jun 15, 2011 | Burlington Resources O & G Co LP | Forsythe Pryor B Unit #5HH | 9,000 | 49737309 |
| 717875 | Jun 10, 2011 | Jun 10, 2011 | Braden Exploration, LLC | Elsom Unit #1HH | 9,000 | 49737308 |
| 717415 | Jun 2, 2011 | Jun 2, 2011 | Richey, Ray Management Co., Inc. | Marion Green Unit #3HH | 7,800 | 49737307 |
| 717259 | May 31, 2011 | May 31, 2011 | Burlington Resources O & G Co LP | Forsythe Pryor a Unit #4HH | 9,000 | 49737306 |
| 717267 | May 27, 2011 | May 27, 2011 | Pioneer Natural Res. USA, Inc. | Dennis Unit #3HH | 9,000 | 49737304 |
| 717267Amendment | May 27, 2011 | May 27, 2011 | Pioneer Natural Res. USA, Inc. | Dennis Unit #3HH | 9,000 | 49737304 |
| 717266 | May 27, 2011 | May 27, 2011 | Pioneer Natural Res. USA, Inc. | Dennis Unit #2HH | 9,000 | 49737305 |
| 717266Amendment | May 27, 2011 | May 27, 2011 | Pioneer Natural Res. USA, Inc. | Dennis Unit #2HH | 9,000 | 49737305 |
| 717264 | May 27, 2011 | May 27, 2011 | Pioneer Natural Res. USA, Inc. | Dennis Unit #1HH | 9,000 | 49737303 |
| 717264Amendment | May 27, 2011 | May 27, 2011 | Pioneer Natural Res. USA, Inc. | Dennis Unit #1HH | 9,000 | 49737303 |
| 716958 | May 27, 2011 | May 27, 2011 | Burlington Resources O & G Co LP | Decatur Ranch C Unit #3HH | 9,000 | 49737302 |
| 716863 | May 27, 2011 | May 27, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #6HH | 9,000 | 49737298 |
| 716863Amendment | May 27, 2011 | May 27, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #6HH | 9,000 | 49737298 |
| 717102 | May 25, 2011 | May 25, 2011 | Pioneer Natural Res. USA, Inc. | Cothren Unit #3HH | 9,000 | 49737301 |
| 717100 | May 25, 2011 | May 25, 2011 | Pioneer Natural Res. USA, Inc. | Cothren Unit #2HH | 9,000 | 49737300 |
| 717095 | May 25, 2011 | May 25, 2011 | Pioneer Natural Res. USA, Inc. | Cothren Unit #1HH | 9,000 | 49737299 |
| 717000 | May 25, 2011 | May 25, 2011 | Braden Exploration, LLC | Slaughter Unit #1HH | 9,000 | 49737297 |
| 716603 | May 24, 2011 | May 24, 2011 | Devon Energy Production Co, L.P. | Fitzgerald, G.B. 'a' GU #1HH | 9,000 | 49737296 |
| 716602 | May 23, 2011 | May 23, 2011 | Regal Energy Operating, L.L.C. | Regal Waggoner #2V | 8,700 | 49737295 |
| 716602Amendment | May 23, 2011 | May 23, 2011 | Regal Energy Operating, L.L.C. | Regal Waggoner #2V | 8,700 | 49737295 |
| 715693 | May 20, 2011 | May 20, 2011 | Ryder Scott Management, LLC | Maeyers #17 | 7,800 | 49737291 |
| 716183 | May 19, 2011 | May 19, 2011 | Aruba Petroleum, Inc. | Gettys Unit #3HH | 9,000 | 49737294 |
| 716183Amendment | May 19, 2011 | May 19, 2011 | Aruba Petroleum, Inc. | Gettys Unit #3HH | 9,000 | 49737294 |
| 715690 | May 19, 2011 | May 19, 2011 | Ryder Scott Management, LLC | Maeyers #16 | 7,800 | 49737292 |
| 716297 | May 18, 2011 | May 18, 2011 | Devon Energy Production Co, L.P. | Young a-Young (SA) "A" #1HH | 9,000 | 49737290 |
| 716297Amendment | May 18, 2011 | May 18, 2011 | Devon Energy Production Co, L.P. | Mackey 2-Young (SA) 'A' #1HH | 9,000 | 49737290 |
| 716023 | May 17, 2011 | May 17, 2011 | Burlington Resources O & G Co LP | Rock Ranch #7HH | 9,000 | 49737293 |
| 716021 | May 17, 2011 | May 17, 2011 | Burlington Resources O & G Co LP | Rock Ranch #6HH | 9,000 | 49737287 |
| 716018 | May 17, 2011 | May 17, 2011 | Burlington Resources O & G Co LP | Rock Ranch #5HH | 9,000 | 49737289 |
| 716169 | May 16, 2011 | May 16, 2011 | Devon Energy Production Co, L.P. | Wise-Perkins (Deep) (SA) 'A' #1HH | 9,000 | 49737288 |
| 715842 | May 10, 2011 | May 10, 2011 | Braden Exploration, LLC | Katie Lee #2HH | 9,000 | 49737286 |
| 715522 | May 10, 2011 | May 10, 2011 | Devon Energy Production Co, L.P. | Kyle-Whitesell a (SA) 'B' #1HH | 9,000 | 49737284 |
| 715516 | May 6, 2011 | May 6, 2011 | Devon Energy Production Co, L.P. | Kyle-Whitesell a (SA) 'A' #2HH | 9,000 | 49737285 |
| 715505 | May 6, 2011 | May 6, 2011 | Devon Energy Production Co, L.P. | Kyle-Whitesell a (SA) 'A' #1HH | 9,000 | 49737283 |
| 715244 | May 3, 2011 | May 3, 2011 | Braden Exploration, LLC | West Unit #1HH | 9,000 | 49737281 |
| 715244Amendment | May 3, 2011 | May 3, 2011 | Braden Exploration, LLC | West Unit #1HH | 9,000 | 49737281 |
| 715244Amendment | May 3, 2011 | May 3, 2011 | Enervest Operating, L.L.C. | West Unit #1HH | 9,000 | 49737281 |
| 715177 | May 2, 2011 | May 2, 2011 | Aruba Petroleum, Inc. | Gettys Unit #2HH | 9,000 | 49737280 |
| 715177Amendment | May 2, 2011 | May 2, 2011 | Aruba Petroleum, Inc. | Gettys Unit #2HH | 9,000 | 49737280 |
| 714919 | May 2, 2011 | May 2, 2011 | McCutchin Petroleum Corporation | J. E. Smith Unit #1HH | 9,000 | 49737270 |
| 715108 | Apr 29, 2011 | Apr 29, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #3HH | 9,000 | 49737279 |
| 715108Amendment | Apr 29, 2011 | Apr 29, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #3HH | 9,000 | 49737279 |
| 715105 | Apr 29, 2011 | Apr 29, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #2HH | 9,000 | 49737278 |
| 715105Amendment | Apr 29, 2011 | Apr 29, 2011 | Burlington Resources O & G Co LP | Forsythe Speer #2HH | 9,000 | 49737278 |
| 715095 | Apr 29, 2011 | Apr 29, 2011 | Pioneer Natural Res. USA, Inc. | Wright #4HH | 9,000 | 49737277 |
| 715088 | Apr 29, 2011 | Apr 29, 2011 | Pioneer Natural Res. USA, Inc. | Wright #3HH | 9,000 | 49737276 |
| 715085 | Apr 29, 2011 | Apr 29, 2011 | Pioneer Natural Res. USA, Inc. | Wright #2HH | 9,000 | 49737275 |
| 715072 | Apr 29, 2011 | Apr 29, 2011 | Pioneer Natural Res. USA, Inc. | Wright #1HH | 9,000 | 49737274 |
| 715027 | Apr 29, 2011 | Apr 29, 2011 | Braden Exploration, LLC | V. Covington Unit #1HH | 9,000 | 49737273 |
| 715011 | Apr 29, 2011 | Apr 29, 2011 | Braden Exploration, LLC | Gallagher Unit #1HH | 9,000 | 49737272 |
| 715011Amendment | Apr 29, 2011 | Apr 29, 2011 | Enervest Operating, L.L.C. | Gallagher Unit #1HH | 9,000 | 49737272 |
| 715005 | Apr 29, 2011 | Apr 29, 2011 | Braden Exploration, LLC | Hand Unit #1HH | 9,000 | 49737271 |
| 714592 | Apr 26, 2011 | Apr 26, 2011 | Burlington Resources O & G Co LP | Decatur Ranch E Unit #6HH | 9,000 | 49737269 |
| 714558 | Apr 21, 2011 | Apr 21, 2011 | Burlington Resources O & G Co LP | Decatur Ranch D Unit #5HH | 9,000 | 49737268 |
| 714289 | Apr 20, 2011 | Apr 20, 2011 | 375 Energy, Inc. | Lynch, Imogene 43 #1 | 9,000 | 49736401 |