X0206 3 2022-02-06 0 0001819493 Xos, Inc. XOS 0001909033 Castaneda Jose C/O XOS, INC. 3550 TYBURN STREET, UNIT 100 LOS ANGELES CA 90065 0 1 0 0 VP, Business Development Common Stock 72790 D Stock Option (Right to Buy) 0.015 2030-05-27 Common Stock 19564 D Stock Option (Right to Buy) 0.015 2030-07-21 Common Stock 15651 D Includes 52,500 shares represented by restricted stock units ("RSU"). The RSUs vested as to 37.5% on December 10, 2021 and the remaining RSUs vest ratably on each of the next ten (10) Quarterly Vesting Dates thereafter. "Quarterly Vesting Dates" mean each of March 10, June 10, September 10, and December 10, provided, however, that to the extent any such date occurs on a weekend day or U.S. federal holiday, the Quarterly Vesting Date will be deemed to occur on the immediately following day that is not a weekend day or U.S. federal holiday. 25% of the stock option vested and became exercisable on April 1, 2021, and thereafter vest as to 1/48th of the shares in equal monthly installments, until such time as the option is 100% vested, subject to the continuing employment of the Reporting Person on each vesting date. /s/ Christen Romero, Attorney-in-Fact for Jose Castaneda 2022-02-16