X0306 4 2022-02-25 0 0001037676 ARCH RESOURCES, INC. ARCH 0001310202 Klein Rosemary L ONE CITYPLACE DRIVE SUITE 300 ST. LOUIS MO 63141 0 1 0 0 Sr. VP, General Counsel & Sec Common Stock 2022-02-25 4 M 0 5116 A 8072 D Common Stock 2022-02-25 4 F 0 1652 116.55 D 6420 D Common Stock 2022-02-25 4 S 0 410 113.57 D 6010 D Common Stock 2022-02-27 4 M 0 550 A 6560 D Common Stock 2022-02-27 4 F 0 246 116.55 D 6314 D Common Stock 2022-02-28 4 S 0 44 116.52 D 6270 D Restricted Stock Units 2022-02-25 4 M 0 5116 0.00 D Class A Common Stock 5116 10234 D Restricted Stock Units 2022-02-27 4 M 0 550 0.00 D Class A Common Stock 550 550 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. The sales of shares was pursuant to the reporting person's pre-existing Rule 10b5-1 trading plan and represents an automatic sale to cover tax obligations and for other purposes. The restricted stock units are fully vested. /s/Rosemary L. Klein, Attorney-in-Fact 2022-03-01