Form 4 Filing for ACV Auctions Inc.

On October 1, 2026, Leanne Fitzgerald, Chief Legal Officer of ACV Auctions Inc., reported the disposition of 4,158 shares of Common Stock at a price of $10.45 per share. This transaction, coded as "F", resulted in a post-transaction share count of 546,306. Additionally, Fitzgerald disposed of 7,183 shares of Common Stock at $10.45 per share, leaving 539,123 shares. Further dispositions include 3,553 shares at $10.45, resulting in 535,570 shares, and 2,924 shares at $10.45, leaving 533,274 shares. Footnote F1 indicates these shares were withheld by the Issuer to cover tax liabilities upon the vesting of restricted stock units and do not represent discretionary sales. Footnote F2 notes that the final transaction includes 628 shares acquired through the Company's 2021 Employee Stock Purchase Plan.