X0306 4 2023-02-25 0 0001037676 ARCH RESOURCES, INC. ARCH 0001046080 EAVES JOHN W ONE CITYPLACE DRIVE SUITE 300 ST. LOUIS MO 63141 1 1 0 0 Executive Chairman Common Stock 2023-02-25 4 M 0 3583 A 138809 D Common Stock 2023-02-27 4 F 0 1410 152.62 D 137399 D Common Stock 2023-02-27 4 M 0 12367 A 149766 D Common Stock 2023-02-27 4 A 0 69562 A 219328 D Common Stock 2023-02-27 4 F 0 32240 152.62 D 187088 D Restricted Stock Units 2023-02-25 4 M 0 3583 0.00 D Class A Common Stock 3583 3584 D Restricted Stock Units 2023-02-27 4 M 0 12367 0.00 D Class A Common Stock 12367 0 D Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock of Arch Resources, Inc. (the "Company"). These shares were withheld by the Company to satisfy the reporting person's tax withholding obligations. Represents an award of Performance Stock Units originally granted to the reporting person on February 27, 2020. On February 9, 2023, the Issuer's Board of Directors determined that the performance conditions with respect to such award had been satisfied, resulting in the vesting of the shares of Common Stock reported herein. The restricted stock units are fully vested. /s/ Rosemary L. Klein, Attorney-in-Fact 2023-02-28