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Short Interest Ratio


Short Interest Ratio, often referred to as Days to Cover, is a financial term used to express the number of days it would take to buy back all the short sold shares in the market, given the security’s average daily trading volume. It’s a measure that shows investor sentiment indicating how many days short-sellers will require to cover their positions if positive news about the company lifts the price. The higher the Short Interest Ratio, the longer it’ll take to buy back the shares and hence, it could indicate a higher potential for a short squeeze.


The phonetics of the keyword “Short Interest Ratio” would be:Short: /ʃɔːrt/Interest: /ˈɪntrəst/Ratio: /ˈreɪʃi.oʊ/

Key Takeaways

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  1. Indicator of Market Sentiment: Short Interest Ratio (SIR), also known as the “days to cover” ratio, is a metric often used to gauge the overall sentiment of the market towards a particular stock. A high SIR suggests that many investors expect the stock’s price to decline, indicating a bearish market sentiment. Conversely, a low SIR suggests a bullish sentiment.
  2. Short Squeeze Possibility: A high Short Interest Ratio can potentially lead to a short squeeze, a situation where a heavily shorted stock moves sharply higher, forcing more short sellers to close out their short positions and adding to the upward pressure on the stock. This scenario can lead to a rapid increase in a stock’s price.
  3. Ideal for Contrarian Investors: Contrarian investors may use the Short Interest Ratio as one of their tools, buying stocks with high SIR in the expectation that the market sentiment is overly pessimistic, and the stock’s price may rebound (i.e., a contrarian strategy is to go against the prevailing market trends).


The Short Interest Ratio, also known as the Days to Cover Ratio, is a significant metric in business and finance since it provides insights into market sentiment toward a specific stock. It indicates how many days it will take short sellers to cover their positions, considering average daily trading volume. A high Short Interest Ratio can suggest that investors are bearish about the stock, expecting the price to decrease. Conversely, if the stock price rises, a high ratio could lead to a “short squeeze” , wherein short sellers need to buy shares to cover their positions, further driving the price up. These potential scenarios make the Short Interest Ratio a crucial indicator for traders and investors in their decision-making processes.


The Short Interest Ratio, also known as days to cover ratio, is a metric in finance that investors and analysts use to gauge market sentiment about a particular stock’s potential to increase in price. It provides an estimate of the number of days it would take short sellers to cover their positions, given the recent average daily trading volume of the stock. The higher the short interest ratio, the more days it would take to buy back all the shares that have been sold short. This is often interpreted as a bearish signal, indicating that investors anticipate a downturn in the stock’s price.The purpose of using the short interest ratio is to better understand the level of pessimism or skepticism that has been built into a stock. It can provide valuable insights for investors on the market sentiment concerning the stock’s future performance. If a stock has a high short interest ratio, it means that many investors are betting the stock’s price will fall. However, if it unexpectedly increases in value, it can lead to a short squeeze, causing the stock’s price to rise rapidly. Thus, the short interest ratio can help investors make strategic investment decisions and manage potential risks.


Short interest ratio, also known as days to cover, is a measure of the number of days it would take for all short sellers in a market to cover their positions. It is calculated by dividing the number of shares sold short by the average daily trading volume.1. **Example from the Automotive Sector: Tesla, Inc.**In January 2020, Tesla, Inc. had a short interest of 24 million shares while its average daily trading volume was about 15 million shares. Therefore, its short interest ratio was 24 million / 15 million = 1.6 days. This indicated that if short sellers decided to cover their positions at that time, it would take them approximately 1.6 days, given the trading volumes at that time.2. **Example from the Software Industry: Adobe Systems Incorporated**As of April 2021, Adobe Systems had a short interest of 6 million shares whereas its average daily trading volume was about 2.5 million shares. Thus, its short interest ratio would be calculated as 6 million / 2.5 million = 2.4 days. This high ratio could indicate that short sellers expected Adobe’s stock price to decline.3. **Example from the Retail Industry: GameStop Corp**Earlier in 2021, GameStop experienced a notable short squeeze where the short interest ratio was over 100%. The number of shares sold short was significantly higher than the average daily trading volume, leading to a squeeze as short sellers rushed to buy shares to cover their positions, causing the stock price to skyrocket. The high short interest ratio in this instance was a signal of negative investor sentiment that ended up contributing to a historical market event.

Frequently Asked Questions(FAQ)

What is a Short Interest Ratio?

The Short Interest Ratio, sometimes referred to as Days to Cover, is a measure of the number of days it would take all short sellers to cover their positions or buy back the shares they borrowed and sold. It’s calculated by dividing the number of shares sold short by the average daily volume of the stock.

How is the Short Interest Ratio used in financial analysis?

This ratio gives an idea of whether a stock’s price could potentially surge in an upwards movement, also known as a short squeeze. If the Short Interest Ratio is high, it could suggest that if the company produces positive news causing buyers to enter the market, short sellers might scramble to buy stock to cover their short positions, leading to a sharp price increase.

Is a high Short Interest Ratio always bad?

Not necessarily. A high Short Interest Ratio indicates that a significant number of investors have shorted the stock, expecting its price to decline. However, it can also set the stage for a short squeeze, which can rapidly drive up the price. Therefore, a high Short Interest Ratio can present both risks and opportunities for investors.

What should one interpret from a low Short Interest Ratio?

A low Short Interest Ratio implies that not many investors have shorted the stock, meaning the general market sentiment may be positive or neutral for this stock. However, as with a high Short Interest Ratio, the interpretation depends on additional market variables and investor sentiment.

How frequently is the Short Interest Ratio updated?

Exchanges typically publish updated short interest data for all securities twice a month.

What is considered a high Short Interest Ratio?

There’s no strict threshold that’s universally accepted, but commonly, a Short Interest Ratio of 5 or higher is considered high, suggesting it would take five days for all short sellers to cover their positions given the current average daily volume.

Can Short Interest Ratio be used as an indicator for market sentiment?

Yes, it is often used as a bearish indicator because it shows how many traders are betting a stock’s price will decline. High Short Interest Ratios can indicate a lot of negative sentiment towards a stock. However, it is just one factor to consider when analyzing a stock and should be used in conjunction with other indicators.

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