Prothena - 13 Year Stock Price History | PRTA

The latest closing stock price for Prothena as of February 24, 2025 is 15.23.

  • An investor who bought $1,000 worth of Prothena stock at the IPO in 2012 would have $1,115 today, roughly 1 times their original investment - a 6.44% compound annual growth rate over 12 years.
  • The all-time high Prothena stock closing price was 78.89 on September 23, 2021.
  • The Prothena 52-week high stock price is 30.85, which is 102.6% above the current share price.
  • The Prothena 52-week low stock price is 11.70, which is 23.2% below the current share price.
  • The average Prothena stock price for the last 52 weeks is 19.53.
For more information on how our historical price data is adjusted see the Stock Price Adjustment Guide.

Prothena - 13 Year Stock Price History | PRTA

  • An investor who bought $1,000 worth of Prothena stock at the IPO in 2012 would have $1,115 today, roughly 1 times their original investment - a 6.44% compound annual growth rate over 12 years.
  • The all-time high Prothena stock closing price was 78.89 on September 23, 2021.
  • The Prothena 52-week high stock price is 30.85, which is 102.6% above the current share price.
  • The Prothena 52-week low stock price is 11.70, which is 23.2% below the current share price.
  • The average Prothena stock price for the last 52 weeks is 19.53.
For more information on how our historical price data is adjusted see the Stock Price Adjustment Guide.