X0508 4 2023-12-15 0 0001037676 ARCH RESOURCES, INC. ARCH 0001213886 NAVARRE RICHARD A ONE CITYPLACE DRIVE, SUITE 300 ST. LOUIS MO 63141 1 0 0 0 0 Dividend Equivalent Rights 2023-12-15 4 A 0 8 0.00 A Class A Common Stock 8 82 D Deferred Stock Units 2023-12-15 4 A 0 94 0.00 A Class A Common Stock 94 2916 D Each dividend equivalent right is the economic equivalent of one share of Class A Common Stock of Arch Resources, Inc. (the "Issuer"). The reporting person has elected to reinvest dividend equivalents paid on outstanding restricted stock units ("RSUs") into additional RSUs. The dividend equivalent rights accrued on restricted stock units held by the reporting person and will vest proportionately with the restricted stock units to which they relate. Vested shares are scheduled to 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. Each deferred stock unit represents the right to receive one share of Class A Common Stock of the Issuer. 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 2023-12-18