As of December 2025 Upstream Bio has a market cap of โน133.75 Billion. This makes Upstream Bio the world's 5249th 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 15th, 2025 the market cap of Upstream Bio was reported to be: