EX-24

POWER OF ATTORNEY

(For Executing Form ID and Forms 3, 4 and 5)

Know all by these presents, that the undersigned hereby constitutes and
appoints each of Leanne Fitzgerald, Stephanie Clabeaux and Michelle Webb of
ACV Auctions Inc. attorneys-in fact and agents to:


(1) Prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the Securities and Exchange Commission
(the "SEC"), a Form ID and Forms 3, 4 and 5 (including amendments thereto
and joint filing agreements in connection therewith) in accordance with
Section 16 of the Securities Exchange Act undersigned's capacity as an
officer, director or beneficial owner of more than 10% of a registered
class of securities of the Company;


(2) Do and perform any and all acts for and on behalf of the undersigned
that may be necessary or desirable to prepare and execute any such Form ID and
Forms 3, 4 or 5 (including amendments thereto and joint filing agreements in
connection therewith) and file such forms with the SEC and any stock exchange,
self-regulatory association or any similar authority; and


(3) Take any other action of any type whatsoever in connection with
the foregoing that, in the opinion of such attorney-in-fact, may be of benefit
to, in the best interest of, or legally required of the undersigned, it being
understood that the documents executed by the attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as the attorney-in-fact may approve in the
attorney-in-fact's discretion.


The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that Such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes,
shall lawfully do or cause to be done by virtue of this power of attorney
and the rights and powers herein granted. The undersigned acknowledges
that the foregoing attorneys-in-fact, and their substitutes, in serving in such
capacity at the request of the undersigned, are not assuming (nor is the
Company assuming) any of the undersigned's responsibilities to comply with
Section 16 of the Exchange Act.


This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned is no longer required to file Forms
3, 4 and 5 with respect to the undersigned's holdings of and transactions in
securities issued by the Company, (b) revocation by the undersigned in a signed
writing delivered to the Company and the foregoing attorneys-in fact or (c) as
to any attorney-in-fact individually, until such attorney-in-fact is no longer
employed by the Company, as applicable.


IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of the date written below.



Date: 8/12/26 /s/ Timothy Fox
Timothy Fox