Prothena Corp Plc (NASDAQ: PRTA) stock closed at $9.32 on 9/24/25 after a major increase of 12.2%. NORMAL trading volume accompanied the advance. The stock has risen 14.2% during the last week but has been extremely weak relative to the market over the last nine months.
Current PriceTarget Research Rating
Prothena has a current Value Trend Rating of D (Negative). This rating combines inconsistent signals from two proprietary PTR measures of a stock’s attractiveness. Prothena has a neutral Appreciation Score of 59 but a very low Power Rating of 3, with the Negative Value Trend Rating the result.
Rating Review
In light of this very positive price change we are reviewing our current Overall Rating of D. This review will be completed in the next several days.
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