ACV Auctions Inc

Our Section 16 officers (as defined in Rule 16a-1 under the Exchange Act) may from time to time enter into plans for the purchase or sale of ACV stock that are intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act.

During the quarter ended September 30, 2024, the following Section 16 officers adopted, modified, or terminated “Rule 10b5-1 trading arrangements” (as defined in Item 408 under Regulation S-K of the Exchange Act):

•On September 9, 2024, William Zerella, ACV's Chief Financial Officer, adopted a trading plan. Mr. Zerella’s trading plan provides for the sale of up to 140,000 shares. The first trade will not occur until January 7, 2025, at the earliest. Mr. Zerella's trading plan is scheduled to terminate on June 12, 2025.

•On September 9, 2024, Craig Anderson, ACV's Chief Corporate Development and Strategy Officer, put amodification letter in place modifying his September 15, 2023 plan. Mr. Anderson’s modification letter provides for the sale of up to 269,683 shares. The first trade will not occur until December 9, 2024, at the earliest. Mr. Anderson’s trading plan is scheduled to terminate on August 14, 2025.

The Rule 10b5-1 trading arrangements described above were adopted and precleared in accordance with ACV’s Insider Trading Policy and actual sale transactions made pursuant to such trading arrangements will be disclosed publicly in future Section 16 filings with the SEC. Other than disclosed above, no other officer adopted, modified orterminated a Rule 10b5-1 trading arrangement or “non-Rule 10b5-1 trading arrangement” (as defined in Item 408 of Regulation S-K) during the three months ended September 30, 2024.