X0306 4 2018-11-23 0 0001037676 ARCH COAL INC ARCH 0001546424 Ziegler John A. ONE CITYPLACE DRIVE SUITE 300 ST. LOUIS MO 63141 0 1 0 0 Chief Commercial Officer Common Stock 2018-11-23 4 M 0 116 A 1077 D Common Stock 2018-11-23 4 F 0 116 82.12 D 961 D Restricted Stock Units 2018-11-23 4 M 0 116 0.00 D Class A Common Stock 116 10263 D Each restricted stock unit converts into one share of Class A Common Stock of Arch Coal, Inc. (the "Company"). On November 23, 2016, the reporting person was granted 10,500 restricted stock units, vesting in three equal annual installments beginning on the first anniversary of the grant date. A portion of the restricted stock units vested on November 23, 2018 was converted into shares and withheld by the Company to satisfy the associated tax withholding obligations. The remaining portion of such vested restricted stock units will convert into shares on the third anniversary of the grant date. /s/ Rosemary L. Klein, Attorney-in-Fact 2018-11-26