Viant COO has 8,636 shares withheld for taxes

COO and director Christopher Vanderhook surrendered shares back to Viant Technology to cover taxes on RSU vesting, leaving a sizable direct Class A holding.

Rhea-AI Filing Summary

Viant Technology Inc. (symbol: DSP) is the issuer of record for a Form 4 filing submitted to the SEC. Vanderhook Christopher reported disposition transactions in this Form 4 filing.

Viant Technology Inc. (DSP) disclosed that Christopher Vanderhook, a director, chief operating officer and more than 10% owner, transferred 8,636 shares of Class A Common Stock back to the company on September 10, 2026. The shares were repurchased by Viant to cover Vanderhook’s estimated taxes arising from the vesting of 16,198 restricted stock units on that date. After this tax-related repurchase, Vanderhook directly held 285,244 Class A shares. The transaction was not reported as made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Disposition: 8,636 shares

Disposition 1 txn

Insider Vanderhook Christopher

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Disposition	Class A Common Stock F1	8,636	$12.74	$110K

Holdings After Transaction: Class A Common Stock — 285,244 shares (Direct)

Footnotes (1)

1. F1. 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 16,198 restricted stock units on September 10, 2026.

Key Figures

Shares disposed to issuer: 8,636 shares Price per share: $12.74 per share Shares held after transaction: 285,244 shares +1 more

4 metrics

Shares disposed to issuer 8,636 shares Class A Common Stock transferred back to Viant Technology on September 10, 2026

Price per share $12.74 per share Value applied to the 8,636 shares repurchased by Viant Technology

Shares held after transaction 285,244 shares Direct Class A Common Stock holdings of Christopher Vanderhook after the disposition

Restricted stock units vested 16,198 units RSUs vesting on September 10, 2026 that gave rise to the tax withholding

Key Terms

restricted stock units, estimated taxes, repurchased by the Issuer

3 terms

restricted stock units financial

"in connection with the vesting of 16,198 restricted stock units on September 10, 2026"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

estimated taxes financial

"in the amount of estimated taxes to be paid by the Reporting Person"

repurchased by the Issuer financial

"Represents shares repurchased by the Issuer from the Reporting Person"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did DSP report for Christopher Vanderhook on September 10, 2026?

DSP reported that Christopher Vanderhook transferred 8,636 shares of Class A Common Stock back to Viant Technology on September 10, 2026 in a disposition to the issuer tied to tax withholding on vested restricted stock units.

Why were Christopher Vanderhook’s DSP shares repurchased by Viant Technology?

The 8,636 shares were repurchased by Viant Technology in an amount corresponding to estimated taxes owed by Christopher Vanderhook in connection with the vesting of 16,198 restricted stock units on September 10, 2026.

How many DSP shares does Christopher Vanderhook hold after this transaction?

After the September 10, 2026 tax-related repurchase, Christopher Vanderhook directly holds 285,244 shares of Viant Technology Class A Common Stock, as reported in the Form 4 filing.

What price per share applied to the DSP shares repurchased from Christopher Vanderhook?

The shares repurchased from Christopher Vanderhook were valued at $12.74 per share for the 8,636 shares transferred back to Viant Technology in the disposition to the issuer on September 10, 2026.

Was Christopher Vanderhook’s DSP transaction under a Rule 10b5-1 trading plan?

No. The Form 4 indicates that the transaction for 8,636 shares disposed to Viant Technology on September 10, 2026 was not made under a Rule 10b5-1 trading plan.

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

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Available on EDGAR 09/14/2026 - 07:34 PM Accepted by SEC EDGAR 09/14/2026 - 07:33 PM Learn about SEC filing dates

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 CALIFORNIA 92612

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/10/2026

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

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

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

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	09/10/2026		D		8,636(1)	D	$12.74	285,244	D

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 16,198 restricted stock units on September 10, 2026.

Remarks:

	/s/ Larry Madden, Attorney-in-Fact for Christopher Vanderhook	09/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)