As of December 2025 Upstream Bio has a market cap of HK$12.24 Billion. This makes Upstream Bio the world's 5123th 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 25th, 2025 the market cap of Upstream Bio was reported to be: