What is Short Interest?
Definition
Short interest is the total number of shares of a stock that have been sold short by investors but not yet covered or closed out. It indicates bearish sentiment and is reported as a number of shares or as a percentage of the total float.
Detailed Explanation
When an investor sells a stock short, they borrow shares from a broker, sell them, and hope to buy them back later at a lower price. Short interest measures how many shares are currently in this borrowed-and-sold state. It is reported twice monthly by exchanges.
Short interest ratio (days to cover) divides the short interest by the average daily trading volume. A ratio above 5-7 days is considered high and increases the risk of a short squeeze.
A short squeeze occurs when a heavily shorted stock rises sharply, forcing short sellers to buy shares to cover their losses. The GameStop event in January 2021 was a dramatic example.
High short interest can be both a bearish signal (smart money betting against the stock) and a potential catalyst for upside (short squeeze potential). Stocks with short interest above 20% of the float are considered heavily shorted.
Formula
Short Interest Ratio (Days to Cover) = Short Interest / Average Daily Volume
Short Interest % = (Shares Sold Short / Total Float) x 100Example
If a stock has 10 million shares sold short out of a 50 million share float, short interest is 20%. If average daily volume is 2 million shares, the days-to-cover ratio is 5 days.
Frequently Asked Questions
What is a short squeeze?
Is high short interest bullish or bearish?
Where can I find short interest data?
Related Terms
Insider Trading
Insider trading refers to buying or selling a company's stock by individuals with access to material nonpublic information. Legal insider trading occurs when corporate insiders trade and properly report it; illegal insider trading involves trading on confidential information.
Beta
Beta measures a stock's volatility relative to the overall market. A beta of 1.0 means the stock moves in line with the market. A beta above 1.0 indicates higher volatility than the market, while a beta below 1.0 indicates lower volatility.
Volatility
Volatility measures the degree of variation in a stock's price over time. Higher volatility means larger and more frequent price swings, indicating greater uncertainty and risk. It is commonly expressed as the annualized standard deviation of returns.
Volume
Volume is the total number of shares or contracts traded in a security during a given period, typically a single trading day. It measures the intensity of trading activity and is a key indicator of market interest, liquidity, and the strength of price movements.
See It in Action
Disclaimer: The information on this page is provided for educational and informational purposes only and does not constitute investment advice. AI-generated analysis may contain errors or inaccuracies. Always conduct your own research and consult a qualified financial advisor before making investment decisions.
See Short Interest in Action
StoxPulse AI automatically tracks and analyzes key financial metrics from earnings calls and SEC filings for your watchlist.