X0609 4 2026-04-21 0 0001828791 Viant Technology Inc. DSP 0001284309 MADDEN LARRY false C/O VIANT TECHNOLOGY INC. 2722 MICHELSON DRIVE, SUITE 100 IRVINE CA 92612 0 1 0 0 Chief Financial Officer 1 Class A Common Stock 2026-04-21 4 S 0 13283 10.9109 D 579744 D Class A Common Stock 2026-04-22 4 S 0 13263 10.7387 D 566481 D Class A Common Stock 2026-04-23 4 S 0 12782 10.1613 D 553699 D Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on December 15, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.64 to $11.43. 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. These shares were sold in multiple transactions at prices ranging from $10.39 to $10.955. 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. These shares were sold in multiple transactions at prices ranging from $10.05 to $10.315. 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 2026-04-23