UPDATE: Mike Sievert served as CEO of T-Mobile from April 2020 to October 2025. The current CEO is Srini Gopalan (since November 1, 2025). Sievert transitioned to an advisory role. G. Michael Sievert became CEO of T-Mobile US, Inc. (NASDAQ: TMUS) on April 1, 2020 — the same day the landmark $26 billion merger with […]