UBS Initiates Prothena With Buy Rating, $58 Price Target By: Benzinga via Benzinga June 01, 2015 at 09:15 AM EDT In a report published Monday, UBS analyst Andrew Peters initiated coverage of Prothena Corporation Plc (NASDAQ: PRTA) with a Buy rating ... Read More >> Related Stocks: Prothena Corp Roche Holding AG Basel American Depositary Shares UBS Group Ag ADR