X0609 4 2026-07-10 0001819493 Xos, Inc. XOS 0001559238 Mattson George N false C/O XOS, INC. 3550 TYBURN STREET, UNIT 100 LOS ANGELES CA 90065 true false false false false Common Stock 2026-07-10 4 A false 60584 0 A 192346 D Common Stock 131250 I NGAC GNM Feeder LLC Common Stock 33333 I GNM ICBC LLC 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 Shares are held by NGAC GNM Feeder LLC ("NGAC"). The Reporting Person may be deemed to beneficially own such shares by virtue of his shared control over NGAC. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. Shares are held by GNM ICBC LLC ("GNM ICBC"). The Reporting Person may be deemed to beneficially own such shares by virtue of his control over GNM ICBC. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. /s/ David M. Zlotchew, Attorney-in-Fact for George N. Mattson 2026-07-14