X0306 4 2013-03-15 0001441849 CLOUD PEAK ENERGY INC. CLD 0001477026 TAYLOR ADRIAN NICK 505 S. GILLETTE AVE. GILLETTE WY 82716 1 Sr VP, Technical Services Common Stock 2013-03-15 4 F 0 647 18.88 D 39537 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 tax vesting of restricted stock issued in 2012, based on the retirement eligibility of such Reporting Person under the terms of the applicable restricted stock agreement. /s/ Lisa Kish, attorney-in-fact for A.N.H. Taylor 2013-03-19