X0306 4 2015-03-15 0001441849 CLOUD PEAK ENERGY INC. CLD 0001377894 Martin Cary W 505 S. GILLETTE AVE. GILLETTE WY 82716 1 Sr VP, Human Resources Common Stock 2015-03-15 4 F 0 1646 5.88 D 42569 D Common Stock 2015-03-15 4 M 0 2231 5.88 A 44800 D Performance Units 2015-03-15 4 M 0 2231 0 D Common Stock 2231 2231 D Reflects the number of shares of common stock withheld by the Issuer in satisfaction of the Reporting Person's tax withholding obligation upon the vesting of restricted stock. Each performance right represented a contingent right to receive one share of Cloud Peak Energy Inc. common stock. The performance rights vested 3 years from the date of grant (which was 03/15/12) upon Cloud Peak Energy's achievement of Performance Goals, which were based upon Cloud Peak Energy's relative and absolute total shareholder return. These achievements resulted in a payout of 48% of the target which was originally reported on a Form 4 filed on 3/19/12. There is no expiration date for performance rights. Exhibit List 1: Attachment 24 - POA /s/ Lisa Kish, attorney-in-fact for Cary Martin 2015-03-17