X0306 4 2021-02-10 0 0001828791 Viant Technology Inc. DSP 0001843104 Vanderhook Christopher C/O VIANT TECHNOLOGY INC. 2722 MICHELSON DRIVE, SUITE 100 IRVINE CA 92612 1 1 0 0 Chief Operating Officer Class A Common Stock 2021-02-10 4 M 0 250625 0.00 A 250625 D Class A Common Stock 2021-02-10 4 S 0 250625 25.00 D 0 D Class A Common Stock 2021-02-10 4 M 0 303411 0.00 A 303411 I By Four Brothers 2 LLC Class A Common Stock 2021-02-10 4 S 0 303411 25.00 D 0 I By Four Brothers 2 LLC Class B Common Stock 7833774 D Class B Common Stock 9483701 I By Four Brothers 2 LLC Class B Units 0.00 2021-02-10 4 M 0 250625 0.00 D Class A Common Stock 250625 7833774 D Class B Units 0.00 2021-02-10 4 M 0 303411 0.00 D Class A Common Stock 303411 9483701 I By Four Brothers 2 LLC Reflects the exchange of Class B Units into shares of Class A Common Stock of the Issuer. Upon the exchange, the corresponding shares of Class B Common Stock were automatically cancelled. In connection with the Issuer's initial public offering, the Reporting Person sold 250,625 shares of Class A Common Stock to the underwriters. In connection with the Issuer's initial public offering, 303,411 shares of Class A Common Stock beneficially owned by the Reporting Person were sold to the underwriters. The Reporting Person holds a one-third interest in Four Brothers 2 LLC. While no individual has voting or investment control over the shares of Class B Common Stock or Class B Units held by Four Brothers 2 LLC, the Reporting Person may be deemed to have an indirect pecuniary interest in 9,483,701 shares of Class B Common Stock and 9,483,701 Class B Units held by Four Brothers 2 LLC. The Class B Units of Viant Technology LLC are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled. /s/ Larry Madden, Attorney-in-Fact for Christopher Vanderhook 2021-02-12