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What is Short Interest?

Short interest is the number of shares or units of a security that have been sold short and not yet covered or repurchased. It is typically expressed as a percentage of the total securities outstanding.

Short Interest -- Formula & Example

Let's assume that Company XYZ has 3 million shares sold short and 120 million shares outstanding. By using this information, we can calculate that Company XYZ's short interest is:

Short Interest = 3,000,000/120,000,000 = 2.5%

Many financial publications and websites report the short interest for various stocks and securities at the middle and end of each month.

Why does Short Interest matter?

Short interest is an indicator of bearish sentiment for the market as a whole and for particular securities. Though Face value should be just one of several factors investors should consider when buying or selling, some analysts believe that securities with low short interests are less likely to experience price declines and short squeezes.

However, other analysts believe that securities with high short interest are more likely to increase in price because eventually the short sellers will have to buy the security to cover their short positions. Either way, large changes in a security's short interest often indicate big changes in investor sentiment, which is something worth investigating regardless of whether an investor intends to short a stock or not.

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Paul Tracy
Paul Tracy

Paul has been a respected figure in the financial markets for more than two decades. Prior to starting InvestingAnswers, Paul founded and managed one of the most influential investment research firms in America, with more than 3 million monthly readers.