X0306 4 2012-08-14 0 0001477032 PROSPECT GLOBAL RESOURCES INC. PGRX 0001515976 Brownstein Chad T. 555 SOUTH BARRINGTON AVENUE, #216 LOS ANGELES CA 90049 1 1 1 0 Exec. Vice Chairman 0001516052 Buffalo Management LLC 555 SOUTH BARRINGTON AVENUE, #216 LOS ANGELES CA 90049 0 0 1 0 0001516057 Quincy Prelude LLC 555 SOUTH BARRINGTON AVENUE, #216 LOS ANGELES CA 90049 0 0 1 0 Common Stock 2012-08-14 4 P 0 4500 2.37 A 4500 I As custodian for son A Common Stock 2012-08-15 4 P 0 2300 2.59 A 6800 I As custodian for son A Common Stock 2012-08-15 4 P 0 500 2.68 A 500 I As custodian for son B Common Stock 2012-08-16 4 P 0 2800 2.76 A 3300 I As custodian for son B Common Stock 2900000 D Common Stock 816667 D The reporting person undertakes to provide to Prospect Global Resources, Inc, any security holder of Prospect Global Resources, Inc, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) (3) (4) and (5) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.24 - $2.49. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.49 - $2.65. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.64 - $2.71. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.69 - $2.92. Quincy Prelude LLC is the record owner of this common stock. Chad T. Brownstein, in his capacity as the owner of 100% of the voting interest of this entity, has a pecuniary interest in this common stock. Buffalo Management LLC is the record owner of this common stock. Quincy Prelude LLC, in its capacity as the sole member of this entity, and Chad T. Brownstein, in his capacity as the owner of 100% of the voting interest of Quincy Prelude LLC, have a pecuniary interest in this common stock. /s/ Jeffrey M. Knetsch, Attorney-in-Fact for Chad T. Brownstein 2012-08-16 /s/ Jeffrey M. Knetsch, Attorney-in-Fact for Quincy Prelude LLC, as the Sole Member of Buffalo Management LLC, by Chad T. Brownstein, its Managing Member 2012-08-16 /s/ Jeffrey M. Knetsch, Attorney-in-Fact for Chad T. Brownstein, as the Managing Member of Quincy Prelude LLC 2012-08-16