What triggers a short squeeze?

Asked by: Jameson Kohler  |  Last update: December 3, 2025
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In the stock market, a short squeeze is a rapid increase in the price of a stock owing primarily to an excess of short selling of a stock rather than underlying fundamentals. A short squeeze occurs when demand has increased relative to supply because short sellers have to buy stock to cover their short positions.

How do you know if a short squeeze is coming?

The best way to identify short squeeze candidates is to look at the number of shares short relative to a stock's average daily trading volume. This is known as the days to cover ratio. Stocks with days to cover ratios of 5 or more may be susceptible to short squeezes.

What starts a short squeeze?

A short squeeze occurs when a stock moves higher and short sellers decide to cover their short positions or are forced to do so via margin calls. As these short sellers buy the stock, the price rises, potentially creating a situation in which more shorts have to cover.

What signals a short squeeze?

Signs of a Short Squeeze

These are: An asset trading near its 52-week lows and the price is much lower than the fair value estimated by experts. The reasons for the gap may be many, but markets eventually correct and settle closer to the fair value. This is the minimum short squeeze price.

How long does a short squeeze usually last?

In general, short squeezes tend to last somewhere between several days and several months. There is no real “typical” length for a short squeeze, as each one is unique.

Investopedia Video: Short Squeeze

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What was the biggest short squeeze in history?

What Was the Bigggest Short Squeeze in History? The biggest short squeeze in history happened to Volkswagen stock in 2008. Although the auto maker's prospects seemed dismal, the company's outlook suddenly reversed when Porsche revealed a controlling stake.

What is the mother of all short squeezes?

MOASS stands for “Mother of All Short Squeezes,” a phenomenon where stock prices skyrocket due to mass buying. It gained prominence with the GameStop stock saga, where day traders challenged large hedge funds. The strategy involves a high volume of purchases to drive up stock prices, countering short sellers.

How to trigger a short squeeze?

Short squeezes are typically triggered either by unexpected good news that drives a security's price sharply higher or simply by a gradual build-up of buying pressure that begins to outweigh the selling pressure in the market.

What is the best indicator for a short squeeze?

Short interest ratio

The higher the ratio, the higher the likelihood short sellers will help drive the price up. A short interest ratio of five or better is a good indicator that short sellers might panic, and this may be a good time to try to trade a potential short squeeze.

What is a good day to cover for a short squeeze?

For traders, a short ratio between 8 and 10 days or even higher is considered an opportunity. On an occasion like this, the gap becomes difficult to be covered and the short sellers will be forced to buy and raise the price of the stock higher.

What happens before a short squeeze?

It occurs when a security has a significant amount of short sellers, meaning lots of investors are betting on its price falling. A short squeeze begins when the price of an asset unexpectedly jumps higher. It gains momentum as a significant number of the short sellers decide to cut losses and exit their positions.

How can a famous person affect a stock price?

When celebrities make negative remarks about a brand, there are instances where the company has lost billions as a direct result. But equally, when a famous face makes an investment into a firm, or sings its praises, the company's shares have seen a major uptick.

Should I sell during a short squeeze?

Short squeezes highlight the inherent risk of short selling, as the potential losses are unlimited. The price of an asset can theoretically rise infinitely, in stark contrast to buying shares, where the loss is limited to the initial investment should the asset's price fall to zero.

How do you stop a short squeeze?

A good way to avoid being caught in a short squeeze is to always place hard stops on your short positions, especially if you are holding them over night. It is also important to note than not all rushes to buy back shares that have been shorted are sparked by positive news.

What is a gamma squeeze?

The gamma squeeze happens when the underlying stock's price begins to go up very quickly within a short period of time. As more money flows into call options from investors, that forces more buying activity which can lead to higher stock prices.

What follows a short squeeze?

Purchasing the stock to cover their short positions raises the price of the shorted stock, thus triggering more short sellers to cover their positions by buying the stock; i.e., there is increasing demand. This dynamic can result in a cascade of stock purchases and an even bigger jump of the share price.

How to tell a short squeeze is coming?

Scanning for a Short Squeeze
  1. The number of shares short should be greater than five times the average daily volume.
  2. The shares short as a percentage of the float should be greater than 10%
  3. The number of shares short should be increasing.

How to screen for short squeeze?

A high ratio shows that a large portion of the stock's shares are being shorted. A short interest ratio above 20% suggests that a lot of investors are betting against the stock, and if the stock's price starts to go up, the short sellers will rush to cover their positions, and that leads to a short squeeze.

What is the formula for short squeeze?

Measuring a short squeeze can involve a metric called the short interest ratio, a.k.a. "days to cover." It indicates, in days, how long it would take to cover or buy back all the shorted shares. Basically, you divide the number of shares sold short by the average daily trading volume.

Is forcing a short squeeze illegal?

Although some short squeezes may occur naturally in the market, a scheme to manipulate the price or availability of stock in order to cause a short squeeze is illegal. In the end, short-sellers are considered well informed investors who have the ability to identify overvalued stocks.

How do you tell if a stock is heavily shorted?

The Bottom Line. Investors can find general shorting information about a stock on many financial websites, as well as the website of the stock exchange on which the stock is listed. The short interest ratio is calculated by dividing the number of a company's shares that have been sold short by the average daily volume.

How do you lose money in a short squeeze?

Once the short-sellers have paid back their lenders, the market runs out of buyers who will pay any price for that stock. And the share prices often fall as quickly as they rose. The danger to traders in a short squeeze is that they'll get in too late and stay in too long and lose money.

How high did GameStop go?

The all-time high GameStop stock closing price was 86.88 on January 27, 2021. The GameStop 52-week high stock price is 64.83, which is 109% above the current share price. The GameStop 52-week low stock price is 9.95, which is 67.9% below the current share price.

Is Roaring Kitty still holding?

Roaring Kitty has dissolved his holdings in Chewy, but meme stocks are alive and well. NEW YORK (AP) — A pivotal actor in the meme stock craze that began during the pandemic continues to hold a powerful sway over the movement of shares in major U.S. corporations.

What is the full form of moass?

The term "Mother of All Short Squeezes" (MOASS) refers to a significant financial event characterised by a rapid increase in the price of a heavily shorted stock, driven primarily by retail investors.