As of February 2026 Upstream Bio has a market cap of โน39.43 Billion. This makes Upstream Bio the world's 7421th 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 23rd, 2026 the market cap of Upstream Bio was reported to be: