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Prothena (PRTA) Stock Chart & Stock Price History

Prothena logo
$10.22 -0.15 (-1.45%)
Closing price 04:00 PM Eastern
Extended Trading
$9.95 -0.27 (-2.63%)
As of 07:54 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.

Prothena Stock Price Performance

The Prothena (PRTA) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 38.06%, with a year-to-date return of -26.21%. In the past month, the stock has increased 26.64%, reflecting recent market activity.

As of the latest close, Prothena traded at $10.37 with a market cap of $558.22 million and volume of 558,918 shares. Five years ago, the stock traded at $11.95, representing a 14.48% decrease over that period. At the time, it had a market cap of $476.94 million and a volume of 814,741 shares.

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5 Day
Performance
+1.29%
1 Month
Performance
+26.64%
3 Month
Performance
+62.48%
Year-To-Date
Performance
-26.21%
1 Year
Performance
-38.06%
5 Year
Performance
-14.48%

PRTA Stock Chart for Tuesday, October, 21, 2025

Prothena Stock Price History

DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization
10/21/2025$10.37$10.22
-1.45%
$10.61$10.18289,798 shs$550.14 million
10/20/2025$9.92$10.37
+4.54%
$10.55$9.96558,918 shs$558.22 million
10/17/2025$10.09$9.92
-1.68%
$10.23$9.61777,040 shs$533.99 million
10/16/2025$10.66$10.09
-5.35%
$10.90$10.03624,810 shs$543.15 million
10/15/2025$10.12$10.66
+5.34%
$10.72$10.12801,906 shs$573.83 million
10/14/2025$10.35$10.12
-2.22%
$10.32$10.03392,072 shs$544.76 million
10/13/2025$10.05$10.35
+2.99%
$10.35$10.00703,153 shs$557.14 million
10/10/2025$10.30$10.05
-2.43%
$10.45$9.98734,065 shs$540.99 million
10/09/2025$10.35$10.30
-0.48%
$10.65$10.28801,307 shs$554.45 million
10/08/2025$10.17$10.35
+1.77%
$10.54$10.13650,918 shs$557.14 million
10/07/2025$9.86$10.17
+3.14%
$10.37$9.921.03 million shs$547.45 million
10/06/2025$9.92$9.86
-0.60%
$10.09$9.77343,437 shs$530.76 million
10/03/2025$9.99$9.92
-0.70%
$10.16$9.58852,906 shs$533.99 million
10/02/2025$9.92$9.99
+0.71%
$10.22$9.85766,735 shs$537.76 million
10/01/2025$9.76$9.92
+1.64%
$10.46$9.78959,026 shs$533.99 million
09/30/2025$9.76$9.76$9.85$9.50989,121 shs$525.38 million
09/29/2025$9.41$9.76
+3.72%
$9.82$9.21946,500 shs$525.38 million
09/26/2025$9.36$9.41
+0.53%
$9.46$9.02714,956 shs$506.54 million
09/25/2025$9.32$9.36
+0.43%
$9.56$9.041.57 million shs$503.85 million
09/24/2025$8.31$9.32
+12.15%
$9.34$8.301.12 million shs$501.70 million
09/23/2025$8.29$8.31
+0.24%
$8.35$8.14404,695 shs$447.33 million
09/22/2025$8.07$8.29
+2.73%
$8.43$8.02511,942 shs$446.25 million

This page (NASDAQ:PRTA) was last updated on 10/21/2025 by MarketBeat.com Staff
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