The latest price target for Prothena Corp (NASDAQ:PRTA) was reported by Citizens on December 1, 2025. The analyst firm set a price target for $19.00 expecting PRTA to rise to within 12 months (a possible 90.57% upside). 33 analyst firms have reported ratings in the last year.

The latest analyst rating for Prothena Corp (NASDAQ:PRTA) was provided by Citizens, and Prothena Corp maintained their market outperform rating.

There is no last upgrade for Prothena Corp

The last downgrade for Prothena Corp PLC happened on May 28, 2025 when B of A Securities changed their price target from $22 to $4 for Prothena Corp PLC.

Analysts arrive at stock ratings after doing extensive research, which includes going through public financial statements, talking to executives and customers of Prothena Corp, and listening in to earnings conference calls. Most analysts do this every three months, so you should get 4 ratings per company per firm each year. The last rating for Prothena Corp was filed on December 1, 2025 so you should expect the next rating to be made available sometime around December 1, 2026.

While ratings are subjective and will change, the latest Prothena Corp (PRTA) rating was a maintained with a price target of $11.00 to $19.00. The current price Prothena Corp (PRTA) is trading at is $9.97, which is out of the analyst’s predicted range.