X0609 4 2026-04-20 0 0001828791 Viant Technology Inc. DSP 0001843104 Vanderhook Christopher false C/O VIANT TECHNOLOGY INC. 2722 MICHELSON DRIVE, SUITE 100 IRVINE CA 92612 1 1 1 0 Chief Operating Officer 1 Class A Common Stock 2026-04-20 4 M 0 12500 0 A 12500 I By Capital V LLC Class B Common Stock 2026-04-20 4 D 0 12500 0 D 9107275 I By Capital V LLC Class A Common Stock 2026-04-20 4 S 0 5000 11.1198 D 7500 I By Capital V LLC Class A Common Stock 2026-04-21 4 S 0 4704 10.9147 D 2796 I By Capital V LLC Class A Common Stock 2026-04-22 4 S 0 2796 10.7436 D 0 I By Capital V LLC Class B Units 2026-04-20 4 M 0 12500 D Class A Common Stock 12500 9107275 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 Capital V LLC of an equal number of Class B Units for Class A common stock. 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 $11.00 to $11.40. 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 14,111 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.64 to $11.46. 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 8,389 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.395 to $10.94. 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. /s/ Larry Madden, Attorney-in-Fact for Christopher Vanderhook 2026-04-22