X0609 4 2026-05-10 0 0001819493 Xos, Inc. XOS 0001877933 Semler Dakota false C/O XOS, INC. 3550 TYBURN STREET, UNIT 100 LOS ANGELES CA 90065 1 1 0 0 Chief Executive Officer 0 Common Stock 2026-05-10 4 F 0 14538 1.85 D 877061 D Represents the number of shares withheld by the Issuer to satisfy the tax withholding obligations in connection with the vesting of the Reporting Person's previously reported Restricted Stock Unit ("RSU") Awards. Each RSU represents a contingent right to receive one share of common stock upon settlement. Includes 499,430 unvested RSUs. /s/ David M. Zlotchew, Attorney-in-Fact for Dakota Semler 2026-05-12