X0609 4 2026-07-10 0001819493 Xos, Inc. XOS 0001179705 OSTERMANN DIETMAR false C/O XOS, INC. 3550 TYBURN STREET, UNIT 100 LOS ANGELES CA 90065 true false false false true Common Stock 2026-07-10 4 A false 60584 0 A 140177 D Common Stock 2026-07-10 4 D false 4158 2.4937 D 136019 D Common Stock 2026-07-13 4 D false 4159 2.3457 D 131860 D Common Stock 2026-07-14 4 D false 4158 2.3913 D 127702 D The shares reported in this transaction represent Restricted Stock Units ("RSUs"), each of which represents a contingent right to receive one share of the Issuer's common stock upon settlement. The RSUs vest on the earlier of (i) the first anniversary of the Grant date and (ii) the day before the Company's 2027 Annual Meeting, subject to the Reporting Person's continuous service with Xos, Inc. through the vesting date. Includes 60,584 unvested RSUs The transaction reported on this line was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 16, 2025. Represents weighted average sales price. The shares were sold at prices ranging from $2.46 to $2.59. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $2.325 to $2.44. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $2.34 to $2.435. The Reporting Person will provide upon request, to the SEC, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price. /s/ David M. Zlotchew, Attorney-in-Fact for Dietmar Ostermann 2026-07-14