Viant Technology Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

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Check the appropriate box:

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Viant Technology Inc.

2722 Michelson Drive, Suite 100

Irvine, California 92612

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held On June 4, 2026

April 23, 2026

Dear Stockholder:

We are pleased to invite you to virtually attend the 2026 Annual Meeting of Stockholders (including any adjournments, continuations or postponements thereof, the “Annual Meeting”) of Viant Technology Inc., a Delaware corporation (“Viant”). The Annual Meeting will be held virtually, via live webcast on Thursday, June 4, 2026 at 9:30 a.m. (Pacific Time). You can attend the Annual Meeting live online by registering at https://proxydocs.com/DSP using the control number which appears on your Notice, your proxy card, and/or the instructions that accompanied your proxy materials. Even with a virtual format, you will still be able to vote and submit questions during the meeting, and we encourage you to attend online and participate. For purposes of attendance at the Annual Meeting, all references in the accompanying Proxy Statement to “present in person” or “in person” shall mean virtually present at the Annual Meeting.

The Annual Meeting will be held for the following purposes, which are more fully described in the accompanying materials:

(1) To elect two Class II directors, Chris Vanderhook and Brett Wilson, to hold office until our annual meeting of stockholders in 2029 and until their successors are duly elected and qualified, or until their earlier death, resignation or removal;

(2) To ratify the selection of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2026; and

(3) To conduct any other business properly brought before the Annual Meeting.

Holders of record of our outstanding shares of capital stock, composed of Class A common stock and Class B common stock, at the close of business on April 9, 2026, are entitled to notice of and to vote at the Annual Meeting, or any continuation, postponement or adjournment of the Annual Meeting. A complete list of these stockholders will be open to the examination of any stockholder at our principal executive offices at 2722 Michelson Drive, Suite 100, Irvine, California 92612 for a period of ten days prior to the Annual Meeting and will be available to stockholders attending the Annual Meeting by following the registered stockholder list link on the virtual meeting access portal and entering the list access number provided via email. The Annual Meeting may be continued or adjourned from time to time without notice other than by announcement at the Annual Meeting.

We have elected to provide internet access to our proxy materials, which include the proxy statement for our Annual Meeting (“Proxy Statement”) accompanying this notice, in lieu of mailing printed copies, where permitted. Providing our Annual Meeting materials via the internet reduces the costs associated with our Annual Meeting and lowers our environmental impact, all without negatively affecting our stockholders’ ability to timely access Annual Meeting materials.

On or about April 23, 2026, we expect to mail to our stockholders a Notice of Internet Availability of Proxy Materials (“Notice”) containing instructions on how to access the Proxy Statement and our Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (“2025 Annual Report”). The Notice provides instructions on how to vote online or by telephone and how to receive a paper copy of your proxy materials by mail. The Proxy Statement and our 2025 Annual Report can be accessed directly at the internet address https://proxydocs.com/DSP using the control number located on the Notice, on your proxy card or in the instructions that accompanied your proxy materials.

Your vote is important. Whether or not you plan to virtually attend the Annual Meeting, please ensure that your shares are voted during the Annual Meeting by signing and returning a proxy card if one is mailed to you or by using our internet or telephonic voting system. Even if you have voted by proxy, you may still vote online if you attend the Annual Meeting.

Please note, however, that if your shares are held on your behalf by a brokerage firm, bank, or other nominee and you wish to vote at the Annual Meeting, you may need to obtain a proxy issued in your name from that nominee. Please contact your broker, bank or other nominee for information about specific requirements if you would like to vote your shares during the Annual Meeting.

By Order of the Board of Directors

Tim Vanderhook

Chief Executive Officer and Chairman

PROXY STATEMENT FOR 2026 ANNUAL MEETING OF STOCKHOLDERS