X0407 4 2023-04-05 0 0001637873 ACV Auctions Inc. ACVA 0001851495 Waterman Michael C/O ACV AUCTIONS INC.640 ELLICOTT ST 640 ELLICOTT ST., SUITE 321 BUFFALO NY 14203 0 1 0 0 Chief Sales Officer 1 Class A Common Stock 2023-04-05 4 S 0 1692 12.10 D 273514 D Shares sold pursuant to a Rule 10b5-1 trading plan entered into on March 15, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.02 to $12.16 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ Michelle Webb, Attorney-in-fact 2023-04-06