X0306 4 2021-09-14 0 0001637873 ACV Auctions Inc. ACVA 0001493307 ZERELLA WILLIAM C/O ACV AUCTIONS INC. 640 ELLICOTT ST., SUITE 321 BUFFALO NY 14203 0 1 0 0 Chief Financial Officer Class A Common Stock 2022-07-01 4 F 0 2609 6.49 D 125962 D Class B Common Stock 2021-09-14 4 F 0 17425 20.00 D Class A Common Stock 17425 232575 D Class B Common Stock 2021-10-14 4 F 0 2050 20.32 D Class A Common Stock 2050 230525 D Class B Common Stock 2021-11-14 4 F 0 2050 20.15 D Class A Common Stock 2050 228475 D Class B Common Stock 2021-12-14 4 F 0 2050 19.13 D Class A Common Stock 2050 226425 D Class B Common Stock 2022-01-14 4 F 0 1545 15.68 D Class A Common Stock 1545 224880 D Class B Common Stock 2022-02-14 4 F 0 1545 10.42 D Class A Common Stock 1545 223335 D Class B Common Stock 2022-03-14 4 F 0 1278 12.23 D Class A Common Stock 1278 222057 D Class B Common Stock 2022-04-14 4 F 0 1269 14.00 D Class A Common Stock 1269 220788 D Class B Common Stock 2022-05-14 4 F 0 1269 8.94 D Class A Common Stock 1269 219519 D Class B Common Stock 2022-06-14 4 F 0 1222 6.93 D Class A Common Stock 1222 218297 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. Each share of Class B Common Stock is convertible at any time at the option of the reporting person into one share of Class A Common Stock. Each share of Class B Common Stock will convert automatically into shares of Class A common stock, on a one-to-one basis, upon the following: (1) the sale or transfer of such share of Class B Common Stock, subject to certain exceptions specified in the Issuer's amended and restated certificate of incorporation; (2) the death of the reporting person; and (3) the final conversion date, defined as the earlier of (a) the last trading day of the fiscal quarter immediately following the tenth anniversary of the effective date of the Issuer's tenth amended and restated certificate of incorporation; (b) the last trading day of the fiscal quarter during which the then-outstanding shares of Class B Common Stock first represent less than 5% of the aggregate number of then-outstanding shares of Class A Common Stock and Class B Common Stock. Includes shares previously reported as restricted stock units. /s/ Michelle Webb, Attorney-in-fact 2022-07-06