Vanderhook reports 8.79M shares (32.8%) in Viant

Viant Technology Inc. beneficial ownership disclosure: Christopher Vanderhook reports beneficial ownership of 8,787,144 shares of Class A common stock, representing 32.8% of the Class A shares.

Rhea-AI Filing Summary

Viant Technology Inc. beneficial ownership disclosure: Christopher Vanderhook reports beneficial ownership of 8,787,144 shares of Class A common stock, representing 32.8% of the Class A shares. The filing states 18,270,658 shares outstanding as of April 9, 2026. The Reporting Person also notes a group with Capital V LLC and Timothy Vanderhook that would beneficially own 44,848,614 shares (71.5%).

Insights

Corporate Governance Analyst

Large insider stake and group control disclosed; potential voting influence is material.

Christopher Vanderhook is reported to beneficially own 8,787,144 shares (32.8%) of Class A common stock, based on an 18,270,658 shares outstanding baseline. The filing also states a qualified "group" holding 44,848,614 shares (71.5%), which would represent a controlling block if aggregated.

The practical effect depends on how voting alignment among group members is exercised and whether any voting agreements exist; subsequent filings or proxy materials may disclose formal voting arrangements or changes in alignment.

Securities Compliance Specialist

Disclosure follows Section 16-style ownership reporting with explicit sources of beneficial ownership.

The statement itemizes components: 238,210 shares held of record, 715,160 option shares exercisable within 60 days, 6,626,214 shares from Class B units, and 1,207,560 shares held in GRATs for children. The filing ties the share counts to the issuer's proxy disclosure.

This filing is a factual ownership statement; any investor implications hinge on subsequent public disclosures about group coordination, voting commitments, or transfers disclosed in future SEC filings.

Key Figures

Beneficial ownership (Reporting Person): 8,787,144 shares Percent of Class A owned (Reporting Person): 32.8% Shares outstanding (issuer disclosure): 18,270,658 shares +4 more

7 metrics

Beneficial ownership (Reporting Person) 8,787,144 shares As of March 31, 2026 beneficial ownership reported; computed using 18,270,658 shares outstanding as of April 9, 2026

Percent of Class A owned (Reporting Person) 32.8% Percent of Class A common stock based on 18,270,658 shares outstanding as of April 9, 2026

Shares outstanding (issuer disclosure) 18,270,658 shares Outstanding Class A shares as of April 9, 2026 per issuer's proxy statement

Group beneficial ownership 44,848,614 shares Aggregate shares reported for group with Capital V LLC and Timothy Vanderhook; 71.5% of Class A

Options exercisable within 60 days 715,160 shares Options counted toward beneficial ownership as exercisable within 60 days of March 31, 2026

Shares from Class B Units 6,626,214 shares Shares underlying Class B Units held of record by the Reporting Person (treated one-to-one upon redemption)

Shares in GRATS for children 1,207,560 shares Shares underlying Class B Units held in grantor retained annuity trusts for the Reporting Person's children

Key Terms

beneficially own, Class B Units, grantor retained annuity trusts, Rule 13d-3

4 terms

beneficially own regulatory

"The Reporting Person may be deemed to beneficially own 8,787,144 shares"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

Class B Units financial

"assumes the redemption of the Class B units of Viant Technology LLC for shares"

grantor retained annuity trusts legal

"Class B Units held in grantor retained annuity trusts for the benefit of the Reporting Person's children"

A grantor retained annuity trust (GRAT) is an estate-planning tool where an owner transfers assets into a trust and receives fixed payments back for a set number of years; any remaining assets after that period pass to designated beneficiaries. For investors it matters because it can move future investment growth to heirs while potentially reducing gift and estate taxes — like putting a rising asset in a timed box that pays you first and gives the remaining upside to others.

Rule 13d-3 regulatory

"calculated pursuant to Rule 13d-3 of the Exchange Act"

Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.

FAQ

What stake does Christopher Vanderhook report in Viant Technology (DSP)?

Mr. Vanderhook reports beneficial ownership of 8,787,144 shares, equal to 32.8% of Class A common stock, based on an 18,270,658 outstanding share count disclosed as of April 9, 2026. The filing breaks the total into record, option, and unit-derived shares.

How many Viant Class A shares were outstanding per the filing?

The filing cites 18,270,658 shares outstanding of Class A common stock as of April 9, 2026, taken from the issuer's definitive proxy statement filed April 23, 2026. That figure is the baseline used to compute percentage ownership.

What does the filing say about a group ownership interest?

The Reporting Person acknowledges acting as a "group" with Capital V LLC and Timothy Vanderhook that would beneficially own 44,848,614 shares, or 71.5% of Class A common stock, calculated pursuant to Rule 13d-3 of the Exchange Act.

Which components make up Vanderhook's reported 8,787,144 shares?

The total comprises 238,210 shares held of record, 715,160 shares underlying options exercisable within 60 days, 6,626,214 shares issuable upon redemption of Class B Units, and 1,207,560 shares held in grantor retained annuity trusts for his children.

Does the filing identify Vanderhook's voting or disposition powers?

Yes. The filing states the Reporting Person has sole voting power and sole dispositive power over 8,787,144 shares and no shared voting or dispositive power over those shares, per the ownership table in the statement.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/13/2026 - 01:46 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Viant Technology Inc.

(Name of Issuer)

Class A common stock, par value $0.001 per share

(Title of Class of Securities)

92557A101

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 92557A101

1

Names of Reporting Persons

Christopher Vanderhook

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 8,787,144.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 8,787,144.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

8,787,144.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

32.8 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Viant Technology Inc.
(b)	Address of issuer's principal executive offices: 2722 Michelson Drive, Suite 100, Irvine, California, 92612
Item 2.
(a)	Name of person filing: This statement is filed on behalf of Christopher Vanderhook (the "Reporting Person").
(b)	Address or principal business office or, if none, residence: The business address of the Reporting Person is c/o Viant Technology Inc., 2722 Michelson Drive, Suite 100, Irvine, CA 92612.
(c)	Citizenship: The Reporting Person is a citizen of the United States of America.
(d)	Title of class of securities: Class A common stock, par value $0.001 per share
(e)	CUSIP Number(s): 92557A101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: The ownership information below represents beneficial ownership of the shares of Class A Common Stock as of March 31, 2026, based upon 18,270,658 shares of the Issuer's Class A Common Stock outstanding as of April 9, 2026, as disclosed in the Issuer's Definitive Proxy Statement filed with the Securities and Exchange Commission on April 23, 2026. The ownership information assumes the redemption of the Class B units of Viant Technology LLC ("Class B Units") beneficially owned by the Reporting Person for shares of the Issuer's Class A Common Stock on a one-to-one basis. The Reporting Person may be deemed to beneficially own 8,787,144 shares of Class A Common Stock, including: (i) 238,210 shares of Class A Common Stock held of record by the Reporting Person, (ii) 715,160 shares of Class A Common Stock underlying stock options that are exercisable or will become exercisable within 60 days of March 31, 2026, (iii) 6,626,214 shares of Class A Common Stock underlying Class B Units held of record by the Reporting Person and (iv) 1,207,560 shares of Class A Common Stock underlying Class B Units held in grantor retained annuity trusts for the benefit of the Reporting Person's children, each of which the Reporting Person serves as trustee.
(b)	Percent of class: 32.8 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 8787144
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 8787144
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. The Reporting Person acknowledges and agrees that he is acting as a "group" with Capital V LLC and Timothy Vanderhook within the meaning of Section 13(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Based in part on information provided by the Issuer, as of the date hereof, such a "group" would be deemed to beneficially own an aggregate of 44,848,614 shares of Class A Common Stock, or 71.5% of the Class A Common Stock, calculated pursuant to Rule 13d-3 of the Exchange Act.
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10. Certifications:

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Christopher Vanderhook

Signature:	Christopher Vanderhook
Name/Title:	Chief Operating Officer
Date:	05/13/2026