Setting The Scene
Citron Research, an activist short-selling firm and renowned for their bearish research reports, announced that they had taken a short position on GameStop, citing that the company was on a terminal decline and had significantly struggled with revenue during the pandemic. When one takes a long position on a stock, they are essentially stating that the company is undervalued by the market and would profit by buying the stock in the hopes that the stock price rises at which point they would sell. When one takes a short position on a stock, however, they are taking a stance that the company is overvalued by the market and is not fundamentally sound. Therefore, a short seller would borrow shares from a broker and sell them to the market with the intention of buying them back at a lower price, at which point they will return the shares to the broker plus some prior agreed-upon fee and profit from the difference.
In simple terms, imagine you borrow a comic book - currently worth R100 - from a friend, as you believe that the value of the comic book will decline. You then sell it to another person for R100. A month later the value of that same comic book is now R10 at which point you buy it back. You then return the comic book to your friend plus a fee of, let’s assume R20, and you make a profit of R70.
A short squeeze, however, is if a short-seller’s belief that the stock price will drop does not play in their favour and the price actually appreciates. The short seller would have to buy it back at a higher price and thus incur a loss.