X0306 4/A 2014-03-10 2014-03-11 0001441849 CLOUD PEAK ENERGY INC. CLD 0001477112 BARRETT MICHAEL 505 S. GILLETTE AVE. GILLETTE WY 82716 1 Exec Vice President & CFO Common Stock 2014-03-10 4 M 0 50000 15.00 A 111192 D Common Stock 2014-03-10 4 F 0 42857 19.90 D 68335 D Employee Non-Qualified Stock Option (Right to Buy) 15.00 2014-03-10 4 M 0 50000 0 D 2012-11-20 2019-11-20 Common Stock 50000 56132 D This Form 4 Amendment is being filed to correct an error in (A) the amount of "Securities Disposed Of" reported in Table I, Box 4 and (B) the amount of "Securities Beneficially Owned Following Reported Transaction" reported in Table I, Box 5 for the original transaction on March 10, 2014. These changes reflect an increase in the number of shares withheld in satisfaction of the Reporting Person's tax withholding obligation as a result of an increase in the Reporting Person's tax withholding rate. Reflects the number of shares withheld by the Issuer in satisfaction of the (1) exercise price of the stock options exercised and (2) Reporting Person's tax withholding obligation upon exercise of the stock options. No shares were sold on the open market by the Reporting Person or the Issuer. /s/ Lisa Kish, attorney-in-fact for Michael Barrett 2014-03-12