Prothena Corporation
PRTA | NASDAQ
$9.01
+$0.50 (+5.88%)
Sep 22, 2026, 11:50 AM ET · Market open
Market Cap History History
Annual Market Cap Change Annual Change
| Date | Market Cap | Change | % Change |
|---|---|---|---|
| Sep 20, 2026 | $443.75M | -$69.78M | -13.59% |
| Dec 25, 2025 | $513.54M | -$300.84M | -36.94% |
| Dec 26, 2024 | $814.38M | -$1.13B | -58.16% |
| Dec 28, 2023 | $1.95B | -$884.57M | -31.25% |
| Dec 29, 2022 | $2.83B | $527.98M | +22.93% |
| Dec 30, 2021 | $2.3B | $1.82B | +380.33% |
| Dec 30, 2020 | $479.45M | -$158.9M | -24.89% |
| Dec 26, 2019 | $638.35M | $229.89M | +56.28% |
| Dec 27, 2018 | $408.46M | -$1.03B | -71.55% |
| Dec 28, 2017 | $1.44B | -$257.21M | -15.19% |
| Dec 29, 2016 | $1.69B | -$460.25M | -21.38% |
| Dec 30, 2015 | $2.15B | $1.57B | +267.93% |
| Dec 25, 2014 | $585.17M | $106.01M | +22.12% |
| Dec 26, 2013 | $479.17M | $357.71M | +294.52% |
| Dec 27, 2012 | $121.45M | n/a | n/a |
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