Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
8.20
-0.05 (-0.61%)
At close: Oct 23, 2026, 4:00 PM EDT
9.10
+0.90 (10.98%)
After-hours: Oct 23, 2026, 7:30 PM EDT
Prothena Corporation Market Cap
Prothena Corporation has a market cap or net worth of $420.96 million as of October 23, 2026. It is the 15,752nd most valuable company in the world and the 2,854th biggest in the United States. Its market cap has decreased by 20.84% in one year.
Market Cap
420.96M
Enterprise Value
139.76M
1-Year Change
-20.84%
Global Rank
Country Rank
#2,854 United States
Category
ChartMarket Cap Chart
Since December 21, 2012, Prothena Corporation's market cap has increased from $127.30M to $420.96M, an increase of 230.69%. That is a compound annual growth rate of 9.02%.
| Date | Market Cap | % Change |
|---|---|---|
| Oct 23, 2026 | 420.96M | -18.12% |
| Dec 31, 2025 | 514.10M | -31.02% |
| Dec 31, 2024 | 745.30M | -61.78% |
| Dec 29, 2023 | 1.95B | -33.09% |
| Dec 30, 2022 | 2.91B | 26.63% |
| Dec 31, 2021 | 2.30B | 380.02% |
| Dec 31, 2020 | 479.50M | -24.08% |
| Dec 31, 2019 | 631.60M | 53.82% |
| Dec 31, 2018 | 410.60M | -71.51% |
| Dec 29, 2017 | 1.44B | -15.04% |
| Dec 30, 2016 | 1.70B | -20.98% |
| Dec 31, 2015 | 2.15B | 277.66% |
| Dec 31, 2014 | 568.50M | -1.92% |
| Dec 31, 2013 | 579.60M | 347.22% |
| Dec 31, 2012 | 129.60M | 1.81% |
| Dec 21, 2012 | 127.30M | - |
View and export this data all the way back to 2012. Sign Up Today.
Market Capitalization
Market capitalization, also called net worth, is the total value of all of a company's outstanding shares. It is calculated by multiplying the stock price by the number of shares outstanding.
Formula: Market Cap = Stock Price * Shares Outstanding
Related Stocks
| Company | Market Cap |
|---|---|
| ProKidney | 435.34M |
| Altimmune | 433.77M |
| Eikon Therapeutics | 433.32M |
| Autolus Therapeutics | 431.18M |
| Tectonic Therapeutic | 427.15M |
| Indaptus Therapeutics | 421.05M |
| Assembly Biosciences | 416.58M |
| ARS Pharmaceuticals | 415.19M |