As of December 2025 Prothena has a market cap of C$0.69 Billion. This makes Prothena the world's 7166th 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 Dec 22nd, 2025 the market cap of Prothena was reported to be: