About Zenas BioPharma, Inc. (ZBIO) data
Data as of September 30, 2026.
Zenas BioPharma, Inc. (ZBIO) has 11.94M shares sold short as of the latest FINRA settlement report on September 30, 2026. Short interest has increased by 0.59% compared with the prior settlement. At the current average daily volume, covering all open short positions would take about 15.48 days (days to cover).
Frequently asked questions
What is the current short interest in ZBIO?
As of the latest FINRA settlement dated September 30, 2026, ZBIO had approximately 11,941,601 shares sold short. Short interest data is reported by FINRA twice per month.
How much does it cost to short ZBIO?
The latest borrow fee (cost to borrow) for ZBIO is 0.55% 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 ZBIO?
Days to cover for ZBIO is approximately 15.48 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.
How many ZBIO shares failed to deliver?
On September 30, 2026, the latest settlement date in the SEC's fails-to-deliver data, 1,030 shares of ZBIO had failed to deliver, worth about $27.56K at the prior day's close (under 0.01% of shares outstanding). That is the balance still outstanding that day, not new fails. Fails come from long sales and delivery delays as well as short sales.
Is ZBIO a short squeeze candidate?
A squeeze needs shorts that are hard to close. ZBIO trades about 771,653 shares a day and would take roughly 15.48 days to unwind current short positions, at a current borrow fee of 0.55%. Higher days-to-cover and a rising borrow fee together are the setup to watch; neither alone is enough.