X0306 4 2021-12-31 0 0001819493 Xos, Inc. XOS 0001171780 RAPP EDWARD J C/O XOS, INC. 3550 TYBURN STREET, UNIT 100 LOS ANGELES CA 90065 1 0 0 0 Common Stock 2021-12-31 4 A 0 1474 0.00 A 1474 D Common Stock 335169 I By Trust The shares reported in this transaction represent Restricted Stock Units ("RSUs"). The RSUs reported vested immediately on the date of grant. The RSUs were issued to the director in lieu of their cash retainer. Shares are held by the Edward Joseph Rapp TTEE U/A DTD 02/07/2005, of which the Reporting Person is trustee. /s/ Kim Merritt, Attorney-in-Fact for Edward J. Rapp 2022-01-04