As of December 2025 Prothena has a market cap of โฌ0.46 Billion. This makes Prothena the world's 7019th 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 10th, 2025 the market cap of Prothena was reported to be: