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Prothena (PRTA) Stock Chart & Stock Price History

Prothena logo
$8.30 +0.15 (+1.78%)
As of 01:19 PM Eastern
This is a fair market value price provided by Massive. 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 increased 46.55%, with a year-to-date return of -13.14%. In the past month, the stock has decreased 15.01%, reflecting recent market activity.

As of the latest close, Prothena traded at $8.15 with a market cap of $426.68 million and volume of 622,612 shares. Five years ago, the stock traded at $57.65, representing a 85.61% decrease over that period. At the time, it had a market cap of $2.55 billion and a volume of 926,129 shares.

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5 Day
Performance
+0.42%
1 Month
Performance
-15.01%
3 Month
Performance
-9.54%
Year-To-Date
Performance
-13.14%
1 Year
Performance
+46.55%
5 Year
Performance
-85.61%

PRTA Stock Chart for Tuesday, June, 16, 2026

Prothena Stock Price History

DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization
06/15/2026$8.25$8.15
-1.21%
$8.77$7.93622,612 shs$426.68 million
06/12/2026$8.26$8.25
-0.12%
$8.45$8.23314,129 shs$431.91 million
06/11/2026$7.91$8.26
+4.42%
$8.46$7.73634,190 shs$432.41 million
06/10/2026$8.47$7.91
-6.61%
$8.59$7.89456,644 shs$414.09 million
06/09/2026$8.56$8.47
-1.05%
$8.87$8.35493,478 shs$443.43 million
06/08/2026$8.79$8.56
-2.62%
$8.89$8.53313,208 shs$448.12 million
06/05/2026$9.25$8.79
-4.97%
$9.38$8.63656,307 shs$460.16 million
06/04/2026$8.92$9.25
+3.70%
$9.45$9.03504,873 shs$484.24 million
06/03/2026$9.19$8.92
-2.94%
$9.21$8.73593,161 shs$466.99 million
06/02/2026$9.59$9.19
-4.17%
$9.59$9.12439,011 shs$502.07 million
06/01/2026$10.18$9.59
-5.80%
$10.07$9.50457,809 shs$502.04 million
05/29/2026$9.98$10.18
+2.00%
$10.23$9.80501,435 shs$532.92 million
05/28/2026$10.03$9.98
-0.50%
$10.05$9.93281,813 shs$522.48 million
05/27/2026$10.06$10.03
-0.30%
$10.26$10.01616,188 shs$525.07 million
05/26/2026$9.83$10.06
+2.34%
$10.07$9.45918,632 shs$526.64 million
05/25/2026$9.83$9.83$10.00$9.36510,854 shs$514.63 million
05/22/2026$9.41$9.83
+4.46%
$10.00$9.36510,854 shs$514.63 million
05/21/2026$9.35$9.41
+0.64%
$9.42$9.04388,742 shs$492.61 million
05/20/2026$9.07$9.35
+3.09%
$9.41$9.09624,874 shs$489.47 million
05/19/2026$9.59$9.07
-5.42%
$9.84$9.02627,300 shs$474.84 million
05/18/2026$9.76$9.59
-1.74%
$10.09$9.53650,972 shs$502.04 million
05/15/2026$9.86$9.76
-1.01%
$9.86$9.46699,760 shs$510.94 million

This page (NASDAQ:PRTA) was last updated on 6/16/2026 by MarketBeat.com Staff.
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