X0609 4 2026-10-01 0 0001637873 ACV Auctions Inc. ACVA 0002030941 Peer Andrew false C/O ACV AUCTIONS INC. 640 ELLICOTT ST., SUITE 321 BUFFALO NY 14203 0 1 0 0 VP, Corporate Controller & CAO 0 Common Stock 2026-10-01 4 F 0 630 10.45 D 194294 D Common Stock 2026-10-01 4 F 0 958 10.45 D 193336 D Common Stock 2026-10-01 4 F 0 827 10.45 D 192509 D Common Stock 2026-10-01 4 F 0 1223 10.45 D 191286 D Common Stock 2026-10-01 4 F 0 674 10.45 D 190612 D Common Stock 2026-10-01 4 F 0 4283 10.45 D 186478 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. Includes 149 shares acquired pursuant to the Company's 2021 Employee Stock Purchase Plan (ESPP) for the purchase period 6/1/2026 to 9/17/2026. /s/ Michelle Webb, Attorney-in-Fact 2026-10-05