The GameStop short squeeze was a January 2021 market event driven by unusually high short interest and a surge of individual-investor buying. As GameStop's share price climbed, some short sellers bought shares to close losing positions, adding more upward pressure. The SEC later found that short covering contributed to the rise, but broader buying sentiment sustained GameStop's weeks-long increase.
GameStop Short Squeeze at a Glance
| Detail | What happened |
|---|---|
| Company | GameStop Corp. |
| Stock ticker | GME |
| Main period | January 2021 |
| Short interest | About 109.26% of shares outstanding on December 31, 2020 |
| January short interest | Reached 122.97% when measured against the reported float |
| January 27 close | $347.51 per share |
| January 28 intraday high | $483 per share |
| Subsequent move | The stock fell more than 86% from the January 28 intraday high to the close at the end of the first week of February |
Why Was GameStop Heavily Shorted?
GameStop was heavily shorted because many investors expected its share price to fall as video game sales moved from physical stores to digital downloads.
The company depended heavily on its retail-store business and was considering a strategic transformation. Ryan Cohen, the co-founder of Chewy, joined GameStop's board in January 2021. That announcement increased investor interest, while Reddit discussions about GameStop and its high short interest had already been growing during 2019 and 2020.
GameStop's short interest was unusually high. It exceeded 100% because the same shares could be lent and sold short more than once. For example, one investor could buy a share from a short seller, then lend that share to another short seller. That process created multiple short positions tied to the same share.
How Did the GameStop Squeeze Work?
The squeeze developed as individual investors bought GameStop shares and options, pushing the price higher and increasing the pressure on short sellers.
Individual investors bought shares and options. Retail participation rose sharply, along with social-media attention and trading volume.
The higher price increased losses for short sellers. A short seller loses money when the stock price rises. Brokers can also demand more collateral when a short position becomes riskier.
Some short sellers bought shares to close their positions. Those purchases added demand and placed more upward pressure on the stock.
The rising price attracted more buyers. Some investors expected the squeeze to continue, which created a feedback loop involving price gains, media coverage and additional buying.
Buying momentum weakened. GameStop's price then reversed sharply.
The SEC found that buying by traders with large short positions increased around January 22 and contributed to some price gains. That buying represented only a small share of total activity, though. GameStop's price stayed elevated after the direct effect of short covering had faded.
Was the Entire Price Increase Caused by Short Covering?
No. Short covering added upward pressure, but it did not explain the full rally.
The SEC found that:
- GameStop's short interest declined as the stock price rose.
- Known short sellers bought shares during parts of the rally.
- Short covering probably increased upward pressure during certain periods.
- Short sellers' purchases made up a small share of total buy volume.
- Positive investor sentiment, rather than short covering, sustained the stock's weeks-long increase.
The event therefore involved several forces: high short interest, aggressive individual-investor buying, social-media enthusiasm and short sellers closing positions at losses. Calling it only a short squeeze leaves out the buying that sustained much of the move.
Was There Also a Gamma Squeeze?
The SEC did not find evidence that a gamma squeeze was the main mechanism behind GameStop's January 2021 rise.
A gamma squeeze can develop when market makers sell large amounts of call options and buy the underlying stock to hedge their exposure. Those hedging purchases can push the share price higher.
Individual-investor options trading increased substantially during the GameStop episode, but much of that increase involved put options. The available data also showed market makers buying, rather than writing, call options. Those findings did not match the usual pattern of a gamma squeeze.
Why Did Robinhood and Other Brokers Restrict GameStop Trading?
Robinhood and other brokers restricted some GameStop trades because volatility increased settlement risk and led to higher collateral requirements.
On January 28, 2021, several brokers stopped customers from opening or increasing positions in GameStop and other heavily traded stocks. In some cases, customers could sell existing positions but could not make new purchases.
The National Securities Clearing Corporation, or NSCC, increased margin requirements as extreme price movements raised the risk that trades would not settle. On January 27, the NSCC issued intraday margin calls totaling $6.9 billion to 36 clearing members.
The SEC report said the NSCC did not tell brokers to stop trading specific stocks. Individual broker-dealers imposed restrictions in response to margin calls, capital requirements and their own risk-management decisions. The report also said the available evidence did not establish that hedge funds ordered Robinhood to impose the restrictions.
What Happened to GameStop's Price Afterward?
GameStop's price fell sharply after reaching an intraday high of $483 on January 28, 2021. By the end of the first week of February, the stock had dropped more than 86% from that high.
The reversal followed a rally that had moved far beyond GameStop's operating performance. Investors who bought near the top faced large losses when buying momentum faded. GameStop later described the episode as a short squeeze that caused price movements unrelated or disproportionate to its business performance.
Melvin Capital, one of the hedge funds targeted by the trade, testified that it began closing its GameStop short position at a loss as the January rally accelerated.
What Does the GameStop Squeeze Show?
A stock with very high short interest can become vulnerable to a rapid price increase, but short interest alone does not determine how far that increase will go.
In GameStop's case, short covering intensified the move at certain points. Individual-investor buying and positive sentiment kept the rally going for longer. That distinction is why the SEC's findings support calling GameStop a short-squeeze event without treating short covering as the sole cause of the price increase.