X0508 4 2023-08-30 0 0001637873 ACV Auctions Inc. ACVA 0001851605 Hirsch Brian C/O ACV AUCTIONS INC. 640 ELLICOTT STREET, #321 BUFFALO NY 14203 1 0 0 0 0 Class A Common Stock 2023-08-30 4 C 0 42200 A 42200 I By Tribeca ACV Holdings, LLC Class A Common Stock 168002 D Class B Common Stock 2023-08-30 4 C 0 42200 D Class A Common Stock 42200 0 I By Tribeca ACV Holdings, LLC Class B Common Stock Class A Common Stock 5821210 5821210 I By Tribeca Venture Fund II, L.P. Class B Common Stock Class A Common Stock 1940405 1940405 I By Tribeca Venture Fund II New York, L.P. These shares of Class B common stock were converted into Class A common stock on a one-for-one basis for no additional consideration. The shares are held by Tribeca ACV Holdings, LLC ("TACV"). Tribeca Venture Partners II GP, LLC ("TVP II GP") is the general partner of TACV. The Reporting Person is a managing partner of TVP II GP. The Reporting Person disclaims beneficial ownership of the shares held by TACV, except to the extent of his pecuniary interest, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such shares. Each share of Class B common stock will convert automatically into one share of Class A common stock for no consideration upon any transfer, except for certain permitted transfers, and has no expiration date. The shares are held by Tribeca Venture Fund II, L.P. ("TVFII"). TVP II GP is the general partner of TVFII. The Reporting Person is a managing partner of TVP II GP. The Reporting Person disclaims beneficial ownership of the shares held by TVFII, except to the extent of his pecuniary interest, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such shares. The shares are held by Tribeca Venture Fund II New York, L.P. ("TVFII NY"). TVP II GP is the general partner of TVFII NY. The Reporting Person is a managing partner of TVP II GP. The Reporting Person disclaims beneficial ownership of the shares held by TVFII NY, except to the extent of his pecuniary interest, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such shares. /s/ Brian Hirsch 2023-09-01