X0609 4 2026-09-10 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 0 Class A Common Stock 2026-09-10 4 D 0 8636 12.74 D 285244 D 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. /s/ Larry Madden, Attorney-in-Fact for Christopher Vanderhook 2026-09-14