MBX ▲ +0.8% - MBX Biosciences, Inc. $MBX - MBX Biosciences Announces Appointment of Jeff Held as Chief Legal Officer MBX Biosciences announced the appointment of Jeff Held as Chief Legal Officer, a leadership addition that contributed to the stock's 0.8% gain today. The company did not provide additional details about Held's background or the timing of his start date in the announcement. 08-SEP-2026 08:00 AM ET