Certain Restricted Stock Units of ACV Auctions Inc. are subject to a Lock-Up Agreement Ending on 20-SEP-2021. These Restricted Stock Units will be under lockup for 181 days starting from 23-MAR-2021 to 20-SEP-2021. Details: The selling shareholders, all of directors, executive officers and the holders of all of outstanding common stock and securities exercisable for or convertible into Class A common stock and Class B common stock outstanding immediately on the completion of this offering have agreed that, without the prior written consent of Goldman Sachs & Co. LLC, on behalf of the underwriters, subject to certain exceptions, that they will not, during the period ending 180 days after the date of this prospectus, or the restricted period offer, sell, contract to sell, pledge, grant any option to purchase, lend or otherwise dispose of any shares of common stock, or any options or warrant to purchase, or any securities convertible into, exchangeable for or that represent the right to receive shares of common stock; and engage in any hedging or other transaction or arrangement which is designed to or which reasonably could be expected to lead to or result in a sale, loan, pledge or other disposition, or transfer of any of the economic consequences of ownership, in whole or in part, directly or indirectly, of any shares of common stock; whether any such transaction described above is to be settled by delivery of common stock or such other securities in cash or otherwise.