MGNI · Magnite announced the internal promotion of Brian Gephart from Chief…

Magnite announced the internal promotion of Brian Gephart from Chief Accounting Officer to CFO, effective October 1, 2026, succeeding retiring CFO David Day. Haas Sullivan was promoted from VP of Accounting to CAO. Both appointments are orderly internal successions with no red flags.

• Brian Gephart appointed CFO effective October 1, 2026, succeeding retiring CFO David Day
• Gephart served as Chief Accounting Officer since June 2021 and has over 20 years of finance experience
• Haas Sullivan appointed CAO effective October 1, 2026, promoted from VP of Accounting
• Gephart receives equity award of $2.25 million (70% RSUs, 30% PSUs)