As of February 2026 Prothena has a market cap of HK$3.79 Billion. This makes Prothena the world's 7259th 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 20th, 2026 the market cap of Prothena was reported to be: