MetaCap

Prothena Stock Price History

NASDAQ: PRTAHealth CareBiotechnology: Pharmaceutical PreparationsUSD

8.84+0.23 (+2.67%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

PRTA price history at a glance

The price history for Prothena (PRTA) on this page begins on December 17, 2012, when the stock closed at $7.20; it most recently closed at $8.84 on October 5, 2026. The highest price in this record is $79.75, reached on September 27, 2021; the latest close is 88.9% below that peak. Across the 13 complete calendar years in the table, PRTA finished higher in 5 and lower in 8. Its best year was 2013 (+322.1%) and its worst was 2018 (-71.0%).

Over roughly 14 years the share price changed +22.8%, a 1.5% compound annual price return (excluding dividends). In the last 12 months alone, PRTA has lost 16.8%. Prices are split-adjusted closing prices; daily open, high, low, close and volume for the past year are listed below.

Summary generated from market data by MetaCap's automated system. Methodology

Key price levels

High since 2012
$79.75
Date of high
Sep 27, 2021
Low since 2012
$0.00
Date of low
Dec 17, 2012
52-week high
$11.80
52-week low
$7.73
Last close
$8.61

PRTA returns

1 week

+0.82%

1 month

-9.75%

3 months

-10.68%

6 months

-18.62%

Year to date

-9.84%

1 year

-16.81%

3 years

-80.47%

5 years

-86.43%

PRTA price return, excluding dividends.

PRTA annual returns

Calendar-year price returns
YearYear-end closeReturn
20268.84-3.91%
20259.20-33.67%
202413.87-61.83%
202336.34-39.68%
202260.25+21.96%
202149.40+311.32%
202012.01-19.72%
201914.96+37.37%
201810.89-70.95%
201737.49-23.79%
201649.19-27.78%
201568.11+234.69%
201420.35-26.40%
201327.65+322.14%
2012*6.55-9.03%

* Partial year: the record begins after the start of 2012; return measured from the first available close.

2026 return is year to date.

PRTA daily prices (past year)

Daily open, high, low, close and volume
DateOpenHighLowCloseChange
8.438.818.368.61+1.53%
7.938.637.888.48+5.74%
8.288.287.808.02-3.02%
8.348.377.918.27-1.08%
8.628.628.358.36-2.11%
8.548.588.358.54+1.91%
8.988.998.378.38-4.56%
8.668.808.598.78+0.69%
8.258.868.078.72+5.19%
8.388.528.198.29-0.36%
8.638.738.288.32-4.15%
8.948.978.678.68-3.45%
8.729.098.708.99+5.64%
8.598.808.468.51-0.82%
8.418.608.258.58+1.42%
8.398.568.238.46+2.67%
8.358.508.208.24-1.08%
8.868.868.308.33-5.98%
8.958.998.798.86-0.78%
9.069.148.778.93-1.00%
9.259.268.979.02-3.01%
9.409.509.229.30-2.52%
9.609.679.359.54-2.85%
9.509.879.489.82+2.29%
9.779.789.519.60-0.88%
9.649.759.379.69+0.78%
9.289.639.269.61+2.78%
9.269.409.109.35+0.21%
9.029.488.959.33+2.64%
9.169.248.959.09-1.73%
9.409.409.159.25-1.80%
9.519.829.429.42+0.32%
9.469.499.199.39-0.63%
9.119.529.099.45+4.65%
9.139.158.719.03-2.80%
8.919.348.919.29+6.66%
8.889.008.588.71-1.91%
8.849.088.738.88+0.23%
9.049.158.848.86-2.42%
9.309.379.049.08-1.94%
9.229.319.099.26+0.43%
9.129.298.869.22+1.10%
8.769.178.539.12+4.11%
8.548.858.048.76+2.10%
8.508.778.338.58+1.06%
8.498.748.418.490.00%
8.338.588.338.49+1.92%
8.178.388.048.33+2.59%
8.418.518.008.12-3.45%
8.508.568.268.41-1.75%
8.458.688.398.560.00%
8.708.788.368.56-1.61%
8.889.138.668.70-0.57%
8.548.838.358.75+2.58%
8.278.638.238.53+1.07%
8.698.798.438.44-3.54%
8.728.818.518.75+0.92%
8.668.858.558.67+0.12%
8.408.808.288.66+2.24%
8.408.668.088.47+0.47%
8.588.638.428.43-2.43%
8.778.888.618.64-2.15%
9.179.198.768.83-4.44%
9.649.829.039.24-4.15%
9.8310.029.559.64-2.13%
9.669.869.569.85+1.76%
9.629.789.339.68+1.89%
9.659.849.479.50-1.96%
9.6110.159.579.69+1.15%
9.7410.009.479.58-2.15%
9.9610.049.759.79-1.81%
10.0010.129.789.97-0.50%
9.3210.099.2810.02+8.09%
9.429.589.199.27-1.38%
9.579.879.269.40-1.57%
9.129.779.129.55+4.37%
8.909.278.899.15+2.46%
8.639.158.528.93+5.18%
8.398.728.398.49+2.41%
8.168.357.858.29+1.72%
8.698.777.938.15-1.21%
8.268.458.238.25-0.12%
7.898.467.738.26+4.42%
8.428.597.897.91-6.61%
8.568.878.358.47-1.05%
8.808.898.538.56-2.62%
9.259.388.638.79-4.97%
9.039.459.039.25+3.70%
9.219.218.738.92-2.94%
9.599.599.129.19-4.17%
10.0310.079.509.59-5.80%
9.9310.249.8010.18+2.00%
9.9510.059.939.98-0.50%
10.1110.2610.0110.03-0.30%
9.8410.079.4510.06+2.34%
9.3610.009.369.83+4.46%
9.169.429.049.41+0.64%
9.099.419.099.35+3.09%
9.619.849.029.07-5.42%
9.6610.099.539.59-1.74%
9.739.869.469.76-1.01%
9.609.889.429.86+2.71%
9.339.739.289.60+1.80%
9.679.829.299.43-2.48%
10.7910.889.469.67-9.88%
11.0011.8010.6210.73+2.00%
11.1011.2110.4010.52-5.90%
11.1911.3011.0211.18-0.09%
10.8911.2510.8911.19+3.71%
10.5811.0010.5510.79+1.41%
11.0411.1410.6410.64-3.80%
10.8911.1210.8411.06+1.75%
11.4611.4610.7410.87-5.56%
10.8411.5710.8311.51+6.67%
10.7111.1210.7110.79+0.37%
10.6510.8210.4010.75+0.19%
10.6911.0710.6010.73+0.09%
10.6910.8510.6110.72+0.47%
10.7810.7810.4810.67-1.11%
10.8210.9710.7710.79-1.01%
10.7110.9910.7010.90+3.61%
10.7810.8510.4510.52-2.77%
10.6210.8710.5110.82+1.98%
10.3410.6710.3410.61+2.91%
10.4910.5510.1810.31-1.81%
10.6010.6010.3710.50-0.76%
10.4710.7010.3810.58-0.66%
10.4810.6810.2910.65+2.80%
9.9810.379.8010.36+3.19%
9.9110.119.8810.04+1.83%
9.7510.089.519.86-1.69%
9.8410.129.8010.03+3.19%
9.339.869.339.72+5.08%
9.249.509.119.25-0.11%
9.429.629.149.26-2.73%
9.199.689.169.52+2.26%
8.849.328.829.31+6.64%
8.758.968.498.73-1.02%
8.839.048.768.82+0.80%
8.548.768.448.75+2.46%
8.548.638.388.54-0.58%
8.948.958.538.59-4.56%
9.109.208.969.00-1.85%
9.279.329.069.17-0.43%
9.409.549.009.21-1.07%
9.489.489.099.31-2.82%
9.709.849.269.58-1.94%
10.2110.279.689.77-0.41%
9.279.959.229.81+2.29%
9.249.649.249.59+1.37%
9.7010.069.369.46-4.06%
9.369.969.369.86+5.34%
9.099.628.959.36-0.43%
9.099.628.979.40+8.42%
8.538.798.488.67+0.35%
8.888.968.638.64-2.70%
9.009.118.538.88-1.00%
9.039.308.758.97-1.10%
9.009.348.819.07+0.55%
9.389.598.209.02-0.11%
9.069.208.809.03-0.66%
8.819.238.819.09+1.45%
8.969.218.808.960.00%
8.859.248.858.96+1.24%
8.939.048.728.85-0.90%
9.019.098.658.93-0.33%
8.819.128.778.96+1.13%
8.909.048.598.86-0.56%
8.588.998.568.91+6.71%
8.869.058.238.35-6.07%
8.779.048.488.89+1.25%
8.909.058.618.78-1.46%
8.798.958.398.91+1.14%
8.989.078.658.81-2.76%
9.159.508.959.06-0.88%
9.699.789.109.14-6.06%
9.9210.099.689.73-2.11%
9.9410.269.779.94-0.60%
10.3010.539.9910.00-3.29%
9.6810.359.6710.34+6.82%
9.289.729.249.68+4.65%
9.129.559.009.25-1.07%
9.299.458.949.35+0.97%
9.169.288.919.26+0.65%
8.949.268.849.20+2.45%
8.779.068.778.98+0.79%
9.169.168.658.91-3.05%
9.199.349.119.19+1.55%
9.039.168.959.05-0.88%
9.009.478.969.13+1.78%
9.019.148.898.97-1.43%
9.249.248.929.10-1.09%
9.569.699.079.20-3.66%
9.309.569.249.55+2.58%
9.459.529.299.31-1.79%
9.499.559.349.48-0.63%
9.679.679.439.54-1.55%
9.469.749.239.69+2.11%
9.539.599.299.49-1.96%
9.169.789.079.68+5.10%
9.389.569.119.21-1.81%
9.469.679.329.38-0.53%
9.789.919.399.43-3.28%
9.9510.169.529.75-2.21%
10.3710.509.949.97-3.76%
10.4010.4910.2010.36+0.29%
9.9310.509.8110.33+4.66%
10.2810.329.699.87-4.36%
10.7010.8010.2310.32-3.82%
11.2011.3010.7110.73-3.07%
11.1811.4810.9811.07-0.81%
11.0411.5710.9511.16-0.09%
10.4011.4810.3111.17+7.92%
10.2910.5310.1410.35+0.78%
10.9811.1310.2210.27-4.47%
10.5210.8310.4610.75+3.07%
10.4810.5910.3710.43-0.67%
10.5010.6210.3010.50+0.96%
10.5510.9110.2910.40-0.76%
10.0210.699.9010.48+4.28%
10.1210.519.9910.05+0.60%
10.2910.499.979.99-3.57%
10.1810.429.9610.36+1.07%
9.9410.329.7510.25+3.22%
10.0410.339.939.93-2.46%
10.8310.8310.1210.18-6.18%
10.3610.9010.2210.85+3.53%
10.3910.7510.1410.48-0.47%
10.9011.0910.4710.53-0.28%
10.4910.969.7210.56+4.76%
10.3010.5010.0210.08-1.85%
10.1710.4510.0010.27+0.10%
10.4010.5610.1610.26-2.66%
10.7611.1710.4110.54-1.95%
10.5410.7910.4010.75+2.58%
10.6310.8210.3510.48-1.60%
10.6010.8010.3410.65+1.04%
11.1411.6910.4010.54+1.64%
9.9810.409.9510.37+5.60%
9.8010.029.719.82+0.72%
9.889.979.729.75-1.32%
10.2210.359.729.88-3.28%
10.3710.6110.1810.22-1.49%
10.0510.559.9610.37+4.54%
9.9910.239.619.92-1.68%
10.7610.9010.0310.09-5.35%
10.1210.7210.1210.66+5.34%
10.3210.3210.0310.12-2.22%
10.0310.3510.0010.35+2.99%
10.3410.459.9810.05-2.43%
10.4310.6510.2810.30-0.48%
10.2710.5410.1310.35—

Prices are adjusted for stock splits. See adjusted closing price for how dividends and splits affect history, and the PRTA chart for longer ranges.