PostRock Energy Corporation announced that it has received written notice from the Administrative Agent of the Third Amended and Restated Credit Agreement originally dated December 20, 2012, that the lenders have accelerated the balance of PostRock's indebtedness and that the entire outstanding principal balance and all interest accrued thereon is immediately due and payable. PostRock continues to analyze various alternative methods to monetize its assets. PostRock believes that the aggregate proceeds from any such transaction will be substantially less than the amount required to repay in full its indebtedness and that its stockholders will lose their entire investment.