As of February 2026 Prothena has a market cap of โน44.40 Billion. This makes Prothena the world's 7227th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Feb 22nd, 2026 the market cap of Prothena was reported to be: