X0609 4 2026-05-19 0 0001759631 Hyliion Holdings Corp. HYLN 0001548568 Oxholm Jose Miguel false C/O HYLIION HOLDING CORP. 1202 BMC DRIVE, SUITE 100 CEDAR PARK TX 78613 0 1 0 0 Chief Legal&Compliance Officer 0 Common Stock 2026-05-19 4 J 0 8550 4.06 D 814820 D Common Stock 2026-05-20 4 J 0 3026 3.92 D 811794 D These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer. /s/ Jose Miguel Oxholm 2026-05-21