Tax-related share withholding by Viant Technology (NASDAQ: DSP) COO

Rhea-AI Filing Summary

Viant Technology Inc. Chief Operating Officer Christopher Vanderhook reported a tax-related share disposition. On March 10, 2026, the company repurchased 44,177 shares of Class A common stock from him at $10.50 per share to cover estimated taxes on the vesting of 82,866 restricted stock units. After this transaction, he holds 303,005 shares directly and 420 shares indirectly through Capital V LLC.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Vanderhook Christopher

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Disposition	Class A Common Stock	44,177	$10.50	$464K
holding	Class A Common Stock	--	--	--

Holdings After Transaction: Class A Common Stock — 303,005 shares (Direct); Class A Common Stock — 420 shares (Indirect, By Capital V LLC)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Vanderhook Christopher

(Last) (First) (Middle)

C/O VIANT TECHNOLOGY INC.

2722 MICHELSON DRIVE, SUITE 100

(Street)

IRVINE CA 92612

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Viant Technology Inc. [ DSP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	03/10/2026		D		44,177(1)	D	$10.5	303,005	D
Class A Common Stock								420	I	By Capital V LLC

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares repurchased by the Issuer from the Reporting Person in the amount of estimated taxes to be paid by the Reporting Person in connection with the vesting of 82,866 restricted stock units on March 10, 2026.

Remarks:

	/s/ Larry Madden, Attorney-in-Fact for Christopher Vanderhook	03/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did Viant Technology (DSP) report for Christopher Vanderhook?

Viant Technology reported that COO Christopher Vanderhook had 44,177 Class A shares repurchased by the company at $10.50 per share. The transaction covered estimated taxes tied to the vesting of 82,866 restricted stock units on March 10, 2026.

Was Christopher Vanderhook’s Viant (DSP) Form 4 an open-market stock sale?

No, the Form 4 shows a disposition of 44,177 shares back to Viant to cover estimated taxes on RSU vesting. It was a tax-related repurchase by the issuer, not an open-market sale initiated to sell shares into the market.

How many Viant Technology (DSP) shares does Christopher Vanderhook own after this Form 4?

After the reported tax-related disposition, Christopher Vanderhook holds 303,005 shares of Class A common stock directly. He also has 420 additional shares held indirectly through Capital V LLC, as reflected in the holding entry on the Form 4.

Why did Viant Technology repurchase 44,177 shares from its COO?

Viant Technology repurchased 44,177 shares from its COO to cover his estimated tax obligation from the vesting of 82,866 restricted stock units. This type of issuer repurchase for tax withholding is a common administrative mechanism in equity compensation programs.

Does the Viant (DSP) Form 4 indicate a change in insider sentiment?

The Form 4 primarily reflects a tax-withholding transaction, not a discretionary market sale. Shares were repurchased by the issuer to cover RSU-related taxes, while Vanderhook continues to hold a substantial direct and indirect stake in Viant Technology after the transaction.