GameStop short squeeze

In January 2021, a short squeeze of the stock of the American video game retailer GameStop and other securities took place, causing major financial consequences for certain hedge funds and large losses for short sellers. Approximately 140 percent of GameStop's public float had been sold short, and the rush to buy shares to cover those positions as the price rose caused it to rise even further. The short squeeze was initially and primarily triggered by users of the subreddit r/wallstreetbets, an Internet forum on the social news website Reddit, although a number of hedge funds also participated. At its height, on January 28, the short squeeze caused the retailer's stock price to reach a pre-market value of over US$500 per share ($125 split-adjusted), nearly 30 times the $17.25 valuation at the beginning of the month. The price of many other heavily shorted securities and cryptocurrencies also increased.

On January 28, some brokerages, particularly app-based brokerage services such as Robinhood, halted the buying of GameStop and other securities, citing the next day their inability to post sufficient collateral at clearing houses to execute their clients' orders. This decision attracted criticism and accusations of market manipulation from prominent politicians and businesspeople from across the political spectrum. Dozens of class action lawsuits have been filed against Robinhood in U.S. courts, and the U.S. House Committee on Financial Services held a congressional hearing on the incident.

The unusually high price and volatility continued after the peak in late January. On February 24, the GameStop stock price doubled within a 90-minute period, and then averaged approximately $200 per share for another month. On March 24, the GameStop stock price fell 34 percent to $120.34 per share after earnings were released and the company announced plans for issuing a new secondary stock offering. On March 25, the stock recovered dramatically, rising by 53 percent.

Short selling is a finance practice in which an investor, known as the short-seller, borrows shares and immediately sells them, in the hope that they will be able to buy them back later ("covering") at a lower price, return the borrowed shares (plus interest) to the lender, and profit off the difference. The practice carries an unlimited risk of losses, because there is no inherent limit to how high a stock's price can rise should the short-seller be proven wrong in their belief that the stock price was going to fall. This is in contrast with taking a long position (simply owning the stock), where the investor's loss is limited to the cost of their initial investment.

Short sellers are exposed to a risk of short squeezing, which occurs when the shorted stock jumps in value because, for instance, there is a sudden piece of favorable news. Short sellers are then forced to buy back the stock they had initially sold, in an effort to keep their losses from mounting. The market demand they create by purchasing the stock to cover their short positions further raises the price of the shorted stock, thus triggering more short sellers to cover their positions by buying the stock. This can result in a cascade of stock purchases and an even bigger jump of the share price.

GameStop, an American chain of brick-and-mortar video game stores, had struggled in the years leading up to the short squeeze due to competition from digital distribution services, as well as the economic effects of the COVID-19 pandemic, which reduced the number of people who shopped in-person. As a result, GameStop's stock price declined, leading many institutional investors to believe it would continue falling, thus short-selling the stock. On January 22, 2021, approximately 140 percent of GameStop's public float had been sold short, meaning some shorted shares had been re-lent and shorted again. Analysts at Goldman Sachs later noted that short interest exceeding 100 percent of a company's public float had only occurred 15 times in the prior 10 years.

However, in mid-2019, investor Michael Burry's Scion Asset Management acquired a 3.3-percent stake in GameStop and wrote to the company's board of directors, identifying overlooked value in the company and urging them to buy back shares. In August 2020, Ryan Cohen (the former CEO of online pet food retailer Chewy) revealed a 9-percent investment in GameStop, leading some to believe that the stock was undervalued. In January 2021, Cohen joined GameStop's board, triggering a stock rally.

The subreddit r/wallstreetbets is an online community on Reddit, a social news website. The community is known for discussion about meme stocks and high-risk stock transactions. Observers congregating around r/wallstreetbets believed the company was being significantly undervalued, and with such a large amount of the stock being short they could trigger a short squeeze, by driving up the price to the point where short sellers had to capitulate and cover their positions at large losses.