DoubleVerify Holdings, Inc.

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Proposal 3—Ratification of Appointment of Independent Registered Public Accounting Firm

Board Recommendation: FOR

Vote Required: Affirmative vote of a majority in voting power of the Shares outstanding present in person or represented by proxy at the Annual Meeting and entitled to vote on the subject matter.

Effect of Abstentions: Same effect as a vote AGAINST the proposal.

Effect of Broker Non-Votes: There will be no broker non-votes associated with this proposal, as the ratification of our independent registered public accounting firm is a routine matter. As a result, if your Shares are held in “street name” and you do not give your bank or broker instructions on how to vote, your Shares will be voted by the broker in its discretion.

Matters to be Presented

We are not aware of any matters to be presented at the Annual Meeting other than those described in this Proxy Statement. If any matters not described in this Proxy Statement are properly presented at the meeting, unless otherwise provided, the proxies will use their own judgment to vote your Shares. If the meeting is adjourned or postponed, the proxies can vote your Shares at the adjournment or postponement as well.

Delivery of Proxy Materials

Notice and Access

We are using “notice and access” procedures to distribute our proxy materials to our stockholders. This method reduces the amount of paper used in producing proxy materials and lowers the costs associated with mailing the proxy materials to stockholders. We are mailing a Notice of Internet Availability of Proxy Materials to stockholders. The Notice includes instructions on how to access the materials over the Internet and how to request a paper or e-mail copy. The Notice further provides instructions on how stockholders may elect to receive proxy materials in the future in printed form or by electronic mail. To select a method of delivery while voting is open, holders of record may follow the instructions when voting online at www.proxyvote.com. At any time, you may also choose your method of delivery of the Company’s proxy materials by visiting www.proxyvote.com. If you own Shares indirectly through a broker, bank or other intermediary, please contact the intermediary for additional information regarding delivery options.

Holders of record will have the Notice or proxy materials delivered directly to your mailing address or electronically if you have previously consented to that delivery method.

Holders of Shares in street name will have the proxy materials or the Notice forwarded to you by the intermediary that holds the Shares.

Eliminating Duplicative Proxy Materials

Some brokers or other nominee record holders may only deliver one set of proxy materials to multiple stockholders who share an address (known as “householding”). All stockholders sharing an address will receive in a single envelope a single Proxy Statement and the Annual Report, along with individual proxy cards or individual Notices for each stockholder. If you are a stockholder who shares an address and last name with one or more other stockholders and would like to revoke your householding consent or you are a stockholder eligible for householding and would like to participate in householding, please contact Equiniti Trust Company, LLC by mail at Operations Center, 48 Wall Street, Floor 23, New York NY 10005 or by telephone at 1-800-937-5449. You will be removed from the householding program within 30 days of receipt of the revocation of your consent. Additional copies of our proxy materials are available upon request by contacting: Equiniti Trust Company, LLC by mail at Operations Center, 48 Wall Street, Floor 23, New York NY 10005 or by telephone at 1-800-937-5449.

Proxy Solicitation Costs

The Board is responsible for the solicitation of proxies for the Annual Meeting. Broadridge will assist us in the distribution of proxy materials and provide voting and tabulation services for the Annual Meeting. All