X0508 4 2023-09-15 0 0001037676 ARCH RESOURCES, INC. ARCH 0001046085 KRIEGSHAUSER PATRICK A ONE CITYPLACE DRIVE, SUITE 300 ST. LOUIS MO 63141 1 0 0 0 0 Deferred Stock Units 2023-09-15 4 A 0 323 0.00 A Class A Common Stock 323 2822 D Each deferred stock unit represents the right to receive one share of Class A Common Stock of the Issuer. The reporting person has elected to reinvest dividend equivalents paid on outstanding restricted stock units ("RSUs") into additional RSUs. The deferred stock units are fully vested and will be delivered to the reporting person on the earlier of the third month anniversary of the date of the reporting person's separation of service from the Board or the date of the occurrence of a Change of Control. /s/ Rosemary L. Klein, Attorney-in-Fact 2023-09-18