X0508 4 2025-12-16 0 0001828791 Viant Technology Inc. DSP 0001843103 Vanderhook Timothy C/O VIANT TECHNOLOGY INC. 2722 MICHELSON DRIVE, SUITE 100 IRVINE CA 92612 1 1 1 0 CEO and Chairman 1 Class A Common Stock 2025-12-16 4 M 0 12500 0 A 12500 I By Capital V LLC Class B Common Stock 2025-12-16 4 D 0 12500 0 D 9157275 I By Capital V LLC Class A Common Stock 2025-12-17 4 S 0 9102 11.704 D 347182 D Class A Common Stock 2025-12-17 4 S 0 5000 11.7366 D 7500 I By Capital V LLC Class A Common Stock 2025-12-18 4 S 0 5000 11.928 D 2500 I By Capital V LLC Class A Common Stock 2025-12-18 4 G 0 85000 0 D 262182 D Class B Units 2025-12-16 4 M 0 12500 D Class A Common Stock 12500 9157275 I By Capital V LLC The Class B Units of Viant Technology LLC ("Class B Units") 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. The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings. Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by the Reporting Person of an equal number of Class B Units for Class A common stock. Shares were sold in a transaction instituted by the Issuer on the Reporting Person's behalf to cover estimated taxes associated with the vesting and settlement of restricted stock units. Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025. The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $11.485 to $12.235. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $11.62 to $12.175. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Reflects a gift to a Donor Advised Fund. /s/ Larry Madden, Attorney-in-Fact for Timothy Vanderhook 2025-12-18