MGNI ▲ +1.7% - Magnite, Inc. $MGNI - Magnite Promotes Brian Gephart to Chief Financial Officer Magnite promoted Brian Gephart to Chief Financial Officer, a move that investors read positively, lifting shares 1.7% today. The appointment of a new CFO can signal confidence in the company's financial direction and stability under new leadership. 21-SEP-2026 08:31 AM ET