X0609 4 2026-05-27 0 0001637873 ACV Auctions Inc. ACVA 0001044530 KAMERICK EILEEN A false C/O ACV AUCTIONS INC. 640 ELLICOTT ST. # 321 BUFFALO NY 14203 1 0 0 0 0 Common Stock 2026-05-27 4 A 0 27500 0 A 37368 D The company's stock previously referred to as Class A Common Stock is now referred to as Common Stock following changes made to the company's articles of incorporation in 2025. There was no change to any rights related to the stock. Represents a restricted stock unit ("RSU") award. The RSUs will vest on the first anniversary of the grant date, provided that the RSUs shall become fully vested as of the day immediately preceding the next Annual Meeting if such date is sooner than first anniversary of the grant date. Vesting of the RSUs is subject in all cases to the Reporting Person's continuous services through the applicable vesting date. /s/ Michelle Webb, Attorney-in-Fact 2026-05-29