Short interest ratio
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The short ratio, short interest ratio (SIR) or float short for a public company is the ratio of tradable shares being shorted to shares in the market, or the float. It is an indirect metric of investor sentiment. When short interest is high, above 40%, it implies company investors hope shares will decline in value.
The ratio is calculated by dividing the number of shares sold short by the average daily trading volume, generally over the last 30 trading days. The ratio represents the number of days it takes short sellers on average to repurchase all the borrowed shares. The ratio is used by both fundamental and technical traders to identify trends.
The short interest ratio can also be calculated for entire exchanges to determine the sentiment of the market as a whole. If an exchange has a high short interest ratio of around five or greater, this can be taken as a bearish signal, and vice versa.
Short squeeze (a.k.a. Bear Squeeze)
A short squeeze can occur if the price of stock with a high short interest begins to have increased demand and a strong upward trend. To cut losses, short sellers may add to demand by buying shares to cover short positions, causing the share price to further escalate temporarily. Short squeezes are more likely to occur in stocks with small market capitalization and a small public float.