About Upstream Bio, Inc. (UPB) data
Data as of September 30, 2026.
Upstream Bio, Inc. (UPB) has 4.51M shares sold short as of the latest FINRA settlement report on September 30, 2026. Short interest has increased by 0.54% compared with the prior settlement. At the current average daily volume, covering all open short positions would take about 7.68 days (days to cover).
Frequently asked questions
What is the current short interest in UPB?
As of the latest FINRA settlement dated September 30, 2026, UPB had approximately 4,514,865 shares sold short. Short interest data is reported by FINRA twice per month.
How much does it cost to short UPB?
The latest borrow fee (cost to borrow) for UPB is 0.52% per year, based on IBKR data. Fees can change throughout the trading day as shares are borrowed and returned.
What is the days to cover ratio for UPB?
Days to cover for UPB is approximately 7.68 days. This estimates how many trading days it would take short sellers to buy back all outstanding short shares at the current average daily volume.
Is UPB a short squeeze candidate?
A squeeze needs shorts that are hard to close. UPB trades about 587,966 shares a day and would take roughly 7.68 days to unwind current short positions, at a current borrow fee of 0.52%. Higher days-to-cover and a rising borrow fee together are the setup to watch; neither alone is enough.