Core Definitions
- Short interest: open short shares.
- Short float: short interest ÷ float.
- Days to cover: short interest ÷ average daily volume.
- Short volume: shares marked short that day (not the same as open shorts).
How to Interpret Changes
Short interest rising while price rises can indicate conviction or hedging; rising shorts with falling price can reflect momentum or fundamentals. Context (catalysts, liquidity, borrow rates, and trend) matters.
- Liquidity check: low float + high short float can be volatile.
- Catalyst check: earnings, product news, FDA, macro events.
- Trend check: is price breaking levels while shorts build?
Common Pitfalls
- Delayed reporting: short interest updates are not real-time.
- Borrow availability: borrow constraints can matter more than % alone.
- Short volume confusion: high short volume doesn’t always mean shorts are piling in.
FAQ
Does high short interest guarantee a squeeze?
No. A squeeze usually needs a catalyst plus forced covering in a low-liquidity environment.