11:35 AM EDT, 09/30/2024 (MT Newswires) -- (Updates with stock move in the headline and first paragraph.)

Prothena's ( PRTA ) shares were down over 20% in recent Monday trading after the company said Chief Medical Officer Hideki Garren is leaving "to pursue an opportunity at a large pharmaceutical company."

Prothena ( PRTA ) plans to initiate a search for a new chief medical officer.

The company also appointed Chad Swanson as chief development officer. He joined as senior vice president and head of clinical development in January 2023, the company said Friday in a statement.

Price: 15.91, Change: -4.14, Percent Change: -20.67