X0609 4 2026-04-01 0 0001637873 ACV Auctions Inc. ACVA 0001419488 Chamoun George false C/O ACV AUCTIONS INC. 640 ELLICOTT ST., SUITE 321 BUFFALO NY 14203 1 1 0 0 Chief Executive Officer 0 Common Stock 2026-04-01 4 F 0 13401 4.27 D 2939576 D Common Stock 2026-04-01 4 F 0 9422 4.27 D 2930154 D Common Stock 2026-04-01 4 F 0 10582 4.27 D 2919572 D Common Stock 2026-04-02 4 A 0 500221 0 A 3419793 D These shares were withheld by the Issuer to cover the tax liability upon the vesting of a time-based restricted stock unit previously granted, and does not represent a discretionary sale by the reporting person. Represents a restricted stock unit ("RSU") award. The RSUs will vest in twelve (12) substantially equal quarterly installments beginning July 1, 2026, subject to the Reporting Person's continuous service through each such date. /s/ Michelle Webb, Attorney-in-Fact 2026-04-03