Published August 5, 2021

If you’re in the #memestock universe with names like AMC (AMC) and GameStop (GME), you’ve heard the term “short squeeze.”

But what is a short squeeze? And why should you care?

To get some answers, we must first talk about what shorting is.

How to Short a Stock

When you short a stock, this is what happens:

You borrow shares of a particular stock through your broker
You sell those shares (the act of shorting)
You hope to repurchase the shares at a lower price, leaving you a profit.

Let’s say you're a greedy hedgie and you hate Corsair (CRSR). You think it's going down hard.

Assume you borrow 100 shares of the stock at $30 per share, and sell them short.

If the stock falls to $25, you can buy the shares back (referred to as “covering”) at a $5 per share profit.

Why? Because you sold at $30, and you bought back at $25. (you sold high, and bought low)

On the flip side, let’s talk about what happens when you lose on a short.

The risk-reward on a short trade is asymmetrical.

Because a $30 stock can only fall $30. But theoretically, it can go up as high as you can imagine.

If in this case, CRSR went to $100, you would be down $70 a share, or $7,000.

Why? Because you sold 100 borrowed shares at $30, and bought them back at $100.

So What Is a Short Squeeze?

This is how a short squeeze happens:

Traders aggressively bid up shares of a heavily-shorted stock (short interest of 10% or more)
The rising share price forces shorts to cover their trades, which makes the stock go up even more
That upward momentum turns into an almost self-fulfilling prophecy, because more buyers pile in

We saw this happen in GME and AMC earlier in 2021. Both of these stocks were heavily shorted by major hedge funds.

But thanks to the #wallstreetbets Reddit group aggressively buying the stocks, the share prices rose incredibly quickly, forcing the shorts to repurchase their shares.

By January 27, GameStop had risen over 1,500%, trading froze multiple times due to volatility. Short-sellers had to exit and cover their positions causing the stock to go up more and in In January alone, GameStop shorts lost approximately $20 billion.

In early June, AMC caught fire because of the #wallstreetbets phenomenon, and shorts lost $4.5 billion. Just like with Gamestop, the shorts were forced to cover their losses. By July, the stock hit a high of $72. By that point, it was up almost 3,500% year-to-date.

So what causes a short squeeze?

Traditionally, a short squeeze is driven by some type of news, like:

A strong earnings report
Insider buying activity
Takeover rumors (or an actual takeover)
An analyst upgrade
A positive turn in the economy or sector

But in the age of #memestocks, short squeezes are increasingly driven by large groups of retail traders buying all at once. And the upward stock price movements just draws more people in to the party.

So remember this: when betting against a heavily shorted stock, you may indeed be correct on the fundamentals. But if buyers get aggressive, you are at risk of being squeezed.

Act accordingly!