X0303 4 2010-09-24 0001473061 PostRock Energy Corp PSTR 0001397264 Lawler David C 210 PARK AVENUE SUITE 2750 OKLAHOMA CITY OK 73102 1 1 0 0 CEO and President Common Stock 2010-09-24 4 S 0 7385 3.32 D 105178 D This sale was effected pursuant to a Rule 10b5-1 trading plan to pay the tax liability incident to the vesting of restricted stock. The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to the issuer, any security holder of the issuer 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 range set forth in this Form 4. These shares were sold in multiple transactions on September 24, 2010 at prices ranging from $3.30 to $3.59, inclusive. David Klvac, attorney-in-fact 2010-09-28