| 511299 | Jul 20, 2001 | Jul 20, 2001 | Pioneer Natural Res. USA, Inc. | Bivins #A47H37500354 | 3,000 |
| 510800 | Jul 11, 2001 | Jul 11, 2001 | Pioneer Natural Res. USA, Inc. | Bivins #A158H37500401 | 3,100 |
| 511093 | Jul 9, 2001 | Jul 9, 2001 | Pioneer Natural Res. USA, Inc. | Bivins "45" #121R37531636 | 2,300 |
| 510957 | Jul 9, 2001 | Jul 9, 2001 | Huber, J. M., Corporation | Bivins #B 1H37500231 | 2,600 |
| 510545 | Jun 25, 2001 | Jun 25, 2001 | Pioneer Natural Res. USA, Inc. | Bivins #A 74H37500137 | 3,100 |
| 510509 | Jun 21, 2001 | Jun 21, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #A 41H37531498 | 3,400 |
| 509937 | Jun 7, 2001 | Jun 7, 2001 | Pioneer Natural Res. USA, Inc. | Bivins "58" #118R37531635 | 2,300 |
| 509774 | Jun 5, 2001 | Jun 5, 2001 | Pioneer Natural Res. USA, Inc. | Masterson "103" #B 77H37500361 | 3,100 |
| 509722 | Jun 4, 2001 | Jun 4, 2001 | Pioneer Natural Res. USA, Inc. | Masterson "95" #B 81H37500333 | 3,100 |
| 509695 | Jun 4, 2001 | Jun 4, 2001 | Pioneer Natural Res. USA, Inc. | Bivins "32" #A 40H37500196 | 3,100 |
| 509163 | May 21, 2001 | May 21, 2001 | Pioneer Natural Res. USA, Inc. | Bivins #A 39H37500235 | 3,500 |
| 507993 | Apr 27, 2001 | Apr 27, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #B108H37531427 | 3,100 |
| 508051 | Apr 20, 2001 | Apr 20, 2001 | Gould Oil Inc. | Masterson #721237531634 | 2,350 |
| 506830 | Mar 26, 2001 | Mar 26, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #B 21H37500273 | 3,500 |
| 506830Amendment | Mar 26, 2001 | Mar 26, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #B 21H37500273 | 3,500 |
| 506769 | Mar 23, 2001 | Mar 23, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #B113H37531545 | 3,100 |
| 506653 | Mar 20, 2001 | Mar 20, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #B110H37531432 | 3,200 |
| 505283 | Feb 14, 2001 | Feb 14, 2001 | Ricks Expl Acquisition Corp | Bivins Ranch #207HH37531633 | 5,000 |
| 505283Amendment | Feb 14, 2001 | Feb 14, 2001 | Ricks Expl Acquisition LLC | Bivins Ranch #207HH37531633 | 5,000 |
| 504745 | Jan 31, 2001 | Jan 31, 2001 | Sunlight Exploration, Inc. | Marsh Ranch #1314H37531630 | 3,608 |
| 504512 | Jan 26, 2001 | Jan 26, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #B45H37500327 | 3,400 |
| 504388 | Jan 23, 2001 | Jan 23, 2001 | Pioneer Natural Res. USA, Inc. | Masterson #B 53H37500341 | 3,100 |
| 503494 | Dec 28, 2000 | Dec 28, 2000 | J. W. Resources Inc. | Bivins Ranch #300437531599 | 2,750 |
| 502000 | Nov 16, 2000 | Nov 16, 2000 | Pioneer Natural Res. USA, Inc. | Masterson #B 83H37500330 | 3,500 |
| 499620 | Sep 15, 2000 | Sep 15, 2000 | Pioneer Natural Res. USA, Inc. | Masterson #B120H37531511 | 3,500 |
| 499253 | Sep 11, 2000 | Sep 11, 2000 | Sunlight Exploration, Inc. | Federal #161937531632 | 4,000 |
| 499204 | Sep 6, 2000 | Sep 6, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A155H37500141 | 3,400 |
| 499203 | Sep 6, 2000 | Sep 6, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A229H37531541 | 3,600 |
| 498823 | Aug 25, 2000 | Aug 25, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A 98H37500264 | 3,300 |
| 498447 | Aug 15, 2000 | Aug 15, 2000 | Huber, J. M., Corporation | Bivins Fee #1037531631 | 3,000 |
| 498447Amendment | Aug 15, 2000 | Aug 15, 2000 | Huber, J. M., Corporation | Bivins Fee #1037531631 | 3,000 |
| 497843 | Aug 4, 2000 | Aug 4, 2000 | Sunlight Exploration, Inc. | Marsh Ranch #50237531629 | 6,000 |
| 497842 | Aug 4, 2000 | Aug 4, 2000 | Sunlight Exploration, Inc. | Marsh Ranch #131437531630 | 4,000 |
| 497447 | Jul 21, 2000 | Jul 21, 2000 | Ricks Exploration, Inc. | Bivins Ranch #1A37531628 | 4,000 |
| 497447Amendment | Jul 21, 2000 | Jul 21, 2000 | Ricks Exploration, Inc. | Bivins Ranch #1AH37531628 | 9,000 |
| 497447Amendment | Jul 21, 2000 | Jul 21, 2000 | Ricks Expl Acquisition Corp | Bivins Ranch #1AH37531628 | 9,000 |
| 495499 | May 26, 2000 | May 26, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A139H37500113 | 3,500 |
| 494802 | May 17, 2000 | May 17, 2000 | Sunlight Exploration, Inc. | Federal #101937531627 | 4,000 |
| 494801 | May 17, 2000 | May 17, 2000 | Sunlight Exploration, Inc. | Federal #201937531626 | 4,000 |
| 494632 | May 3, 2000 | May 3, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A95H37500224 | 3,600 |
| 493786 | Apr 5, 2000 | Apr 5, 2000 | Gould Oil Inc. | Masterson #741237531625 | 2,350 |
| 493336 | Mar 23, 2000 | Mar 23, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A201H37531469 | 3,600 |
| 493335 | Mar 23, 2000 | Mar 23, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A203H37531476 | 3,500 |
| 493280 | Mar 22, 2000 | Mar 22, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A 96H37500129 | 3,500 |
| 492892 | Mar 9, 2000 | Mar 9, 2000 | Sunlight Exploration, Inc. | Marsh Ranch #40237531624 | 4,000 |
| 492550 | Feb 29, 2000 | Feb 29, 2000 | Pioneer Natural Res. USA, Inc. | Bivins "34" #A198H37531455 | 3,400 |
| 492548 | Feb 29, 2000 | Feb 29, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A105H37500228 | 3,500 |
| 492051 | Feb 15, 2000 | Feb 15, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A 33H37500216 | 3,500 |
| 491992 | Feb 14, 2000 | Feb 14, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A183H37531225 | 3,500 |
| 491883 | Feb 8, 2000 | Feb 8, 2000 | Sunlight Exploration, Inc. | Marsh Ranch #30237531621 | 4,000 |
| 491882 | Feb 8, 2000 | Feb 8, 2000 | Sunlight Exploration, Inc. | Marsh Ranch #401437531622 | 4,000 |
| 491881 | Feb 8, 2000 | Feb 8, 2000 | Sunlight Exploration, Inc. | Marsh Ranch #501437531623 | 4,000 |
| 491139 | Jan 19, 2000 | Jan 19, 2000 | Pioneer Natural Res. USA, Inc. | Bivins #A100H37500218 | 3,500 |
| 489064 | Nov 4, 1999 | Nov 4, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #A79H37500074 | 3,400 |
| 488419 | Oct 26, 1999 | Oct 26, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #A 35H37500234 | 3,400 |
| 488093 | Oct 4, 1999 | Oct 4, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #114R37531619 | 2,500 |
| 487418 | Sep 9, 1999 | Sep 9, 1999 | Sunlight Exploration, Inc. | Marsh Ranch #10237531618 | 4,000 |
| 487417 | Sep 9, 1999 | Sep 9, 1999 | Sunlight Exploration, Inc. | Marsh Ranch #20237531617 | 4,000 |
| 486891 | Aug 23, 1999 | Aug 23, 1999 | Questar Expl. and Prod. Co. | Bivins Ranch #10237531374 | 7,516 |
| 486244 | Aug 2, 1999 | Aug 2, 1999 | Luxor Oil & Gas, Inc. | McBride #9837531616 | 3,200 |
| 486244Amendment | Aug 2, 1999 | Aug 2, 1999 | Luxor Oil & Gas, Inc. | McBride #9837531616 | 3,200 |
| 486172 | Jul 26, 1999 | Jul 26, 1999 | Questar Expl. and Prod. Co. | Bivins Ranch #120337531615 | 6,000 |
| 486171 | Jul 26, 1999 | Jul 26, 1999 | Questar Expl. and Prod. Co. | Bivins Ranch #130337531614 | 6,000 |
| 485973 | Jul 21, 1999 | Jul 21, 1999 | Pioneer Natural Res. USA, Inc. | Masterson "36" #159R37531613 | 2,400 |
| 485707 | Jul 12, 1999 | Jul 12, 1999 | Pioneer Natural Res. USA, Inc. | Masterson "63" #161R37531612 | 2,500 |
| 485512 | Jun 29, 1999 | Jun 29, 1999 | Pioneer Natural Res. USA, Inc. | Masterson "102" #156R37531611 | 2,300 |
| 485252 | Jun 17, 1999 | Jun 17, 1999 | J. W. Resources Inc. | Bivins Ranch #200537531610 | 2,750 |
| 484895 | Jun 3, 1999 | Jun 3, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #117R37531609 | 2,400 |
| 484894 | Jun 3, 1999 | Jun 3, 1999 | Pioneer Natural Res. USA, Inc. | Masterson #158R37531608 | 2,000 |
| 484860 | Jun 3, 1999 | Jun 3, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #115R37531607 | 2,500 |
| 484859 | Jun 3, 1999 | Jun 3, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #116R37531606 | 2,500 |
| 484769 | May 27, 1999 | May 27, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #119R37531605 | 2,500 |
| 484768 | May 27, 1999 | May 27, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #120R37531604 | 2,500 |
| 484744 | May 25, 1999 | May 25, 1999 | Pioneer Natural Res. USA, Inc. | Masterson 83 #157R37531603 | 2,300 |
| 484743 | May 25, 1999 | May 25, 1999 | Pioneer Natural Res. USA, Inc. | Masterson 74 #155R37531602 | 2,600 |
| 484742 | May 25, 1999 | May 25, 1999 | Pioneer Natural Res. USA, Inc. | Coughlin #A 4H37531484 | 3,200 |
| 484742Amendment | May 25, 1999 | May 25, 1999 | Pioneer Natural Res. USA, Inc. | Coughlin #A 4H37531484 | 3,300 |
| 484741 | May 25, 1999 | May 25, 1999 | Pioneer Natural Res. USA, Inc. | Masterson 82 #154R37531601 | 2,350 |
| 484457 | May 11, 1999 | May 11, 1999 | Sunlight Exploration, Inc. | Marsh Ranch #404837531600 | 4,000 |
| 483765 | Apr 12, 1999 | Apr 12, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #A193H37531430 | 3,200 |
| 483482 | Mar 26, 1999 | Mar 26, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #A204H37531481 | 3,400 |
| 483482Amendment | Mar 26, 1999 | Mar 26, 1999 | Pioneer Natural Res. USA, Inc. | Bivins #A204H37531481 | 3,400 |
| 481860 | Jan 4, 1999 | Jan 4, 1999 | J. W. Resources Inc. | Bivins Ranch #300437531599 | 2,750 |
| 481330 | Dec 8, 1998 | Dec 8, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "81" #A23237531598 | 3,300 |
| 480285 | Oct 23, 1998 | Oct 23, 1998 | Colorado Interstate Gas Co. | Bivins #980637531597 | 400 |
| 480283 | Oct 23, 1998 | Oct 23, 1998 | Colorado Interstate Gas Co. | Bivins #980437531596 | 400 |
| 479098 | Aug 28, 1998 | Aug 28, 1998 | Anadarko Petroleum Corp. | State "CR" #1006BH37500371 | 2,020 |
| 479096 | Aug 28, 1998 | Aug 28, 1998 | Anadarko Petroleum Corp. | State -CR- #404BH37531377 | 2,430 |
| 479096Amendment | Aug 28, 1998 | Aug 28, 1998 | Anadarko Petroleum Corp. | State -CR- #404BH37531377 | 2,450 |
| 478497 | Aug 10, 1998 | Aug 10, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "10" #149R37531595 | 2,500 |
| 478336 | Jul 30, 1998 | Jul 30, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "34" #A23137531594 | 3,400 |
| 478164 | Jul 23, 1998 | Jul 23, 1998 | Seagull Energy E&P Inc. | Bivins D #17R37531593 | 2,400 |
| 477854 | Jul 17, 1998 | Jul 17, 1998 | Seagull Energy E&P Inc. | Bivins A #18R37531591 | 1,960 |
| 477855 | Jul 14, 1998 | Jul 14, 1998 | Seagull Energy E&P Inc. | Bivins Unit #17R37531592 | 1,900 |
| 477570 | Jul 6, 1998 | Jul 6, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "36" #112R37531590 | 2,400 |
| 477569 | Jul 6, 1998 | Jul 6, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "57" #110R37531589 | 2,400 |
| 477429 | Jun 26, 1998 | Jun 26, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "35" #111R37531588 | 2,300 |
| 476370 | Jun 17, 1998 | Jun 17, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "15" #102R37531587 | 2,100 |
| 476871 | Jun 10, 1998 | Jun 10, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "35" #142R37531584 | 2,500 |
| 476870 | Jun 10, 1998 | Jun 10, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "10" #137R37531585 | 2,500 |