Robinhood halted trading on GameStop and AMC in January 2021, and the decision sparked immediate outrage

On January 28, 2021, Robinhood stopped users from buying shares of GameStop, AMC, and several other stocks that retail traders had been buying in large numbers. Users could still sell their shares, but not buy new ones. The move came without warning during market hours, when thousands of people were trying to add to their positions. Robinhood said the halt was necessary because of clearing house requirements and risk management, but the timing and the one-sided nature of the restriction — allowing sales but not purchases — made it look like the company was protecting Wall Street at the expense of its own users.

The decision became known as "the Robinhood Surprise" because it revealed how much power a retail brokerage has over its customers' ability to trade, and how that power can be exercised in ways that benefit large financial institutions. It also raised questions about whether Robinhood's business model — making money partly from selling order flow to hedge funds — created a conflict of interest when those same hedge funds were on the losing side of the trade.

Key Takeaways

  • Robinhood stopped allowing purchases of GameStop, AMC, and other heavily-traded stocks on January 28, 2021, while still allowing sales.
  • The company cited clearing house capital requirements as the reason, but the restriction looked like it protected large short-sellers rather than retail traders.
  • The halt lasted only a few days, but it exposed how brokerages can restrict trading during volatile periods and how that affects ordinary investors.
  • Congressional hearings and regulatory reviews followed, raising questions about whether brokerages should have to disclose when they restrict trading and why.
  • Robinhood later paid a $70 million settlement to the SEC and FINRA over the incident and other compliance failures.

Why Robinhood said it had to stop the buying

Robinhood's official explanation centered on clearing house requirements. When you buy a stock through a broker, the broker has to put up capital at a clearinghouse — essentially a middleman that guarantees the trade will settle. During the GameStop surge, the volume and volatility were so high that the clearinghouse raised the amount of capital Robinhood had to deposit to cover potential losses. Robinhood said it did not have enough cash on hand to meet the new requirement and still operate normally.

The company also pointed to risk management. Robinhood is a market maker and options trader itself, not just a brokerage. When retail traders were buying call options on GameStop, Robinhood had to hedge those positions by buying shares or other instruments. The rapid price swings meant Robinhood's own trading desk was exposed to large losses. Stopping new purchases reduced the number of new options contracts it had to hedge.

What Robinhood did not say clearly at the time was that it could have raised capital from investors or borrowed money to meet the clearinghouse requirement. Other brokerages like Fidelity and Charles Schwab did not halt trading during the same period, though they did raise capital to cover the increased clearing requirements. This made Robinhood's decision look like a choice rather than a necessity.

The conflict of interest that made people angry

Robinhood makes money in part by selling its users' order flow to market makers and hedge funds. That means when you place a buy order for GameStop, Robinhood sells information about that order — or the order itself — to firms that profit from knowing what retail traders are doing. Some of those firms, including Citadel Securities, were also connected to Melvin Capital, a hedge fund that was short GameStop and losing money as the price climbed.

The timing of the halt — coming right when retail traders were winning and large short-sellers were losing — made it look like Robinhood was protecting its financial partners. Robinhood denied this, and there is no evidence that Citadel or Melvin Capital directly told Robinhood to halt trading. But the appearance of a conflict was enough to damage Robinhood's reputation and trigger investigations.

The incident raised a broader question: should a brokerage that profits from selling order flow to hedge funds be allowed to restrict trading in a way that benefits those same hedge funds? Regulators have not yet answered that question with new rules, but it remains a point of concern for retail traders and their advocates.

What happened after the halt

Robinhood lifted the restrictions after a few days, but the damage was done. The company faced immediate lawsuits from users who said they were harmed by the trading halt. Several states' attorneys general opened investigations. Congress held hearings where Robinhood's CEO Vlad Tenev testified alongside Keith Gill, the retail trader who had championed GameStop, and representatives of hedge funds and market makers.

In June 2023, Robinhood agreed to pay $70 million to settle charges from the SEC and FINRA. The settlement covered not just the trading halt but also other compliance failures, including misleading disclosures about how the company makes money and failures to protect customer data. The SEC's order did not explicitly say the halt itself was illegal, but it did say Robinhood failed to disclose its conflicts of interest clearly enough.

The halt also accelerated a shift in how retail traders think about brokerages. Many moved accounts to competitors or demanded that Robinhood change how it makes money. Robinhood later announced plans to reduce its reliance on order flow sales, though it still uses that model.

How the Surprise changed what people know about brokerages

Before January 2021, most retail traders did not know that brokerages could halt trading on specific stocks. The assumption was that if you had money in your account and the market was open, you could buy or sell. The Robinhood Surprise showed that was not true — brokerages have the power to restrict trading, and they can do it quickly and without advance notice.

The incident also made order flow sales visible to ordinary people. Robinhood had always disclosed that it sells order flow, but the disclosure was buried in account agreements and risk documents. After the halt, financial media explained the practice widely, and retail traders began asking whether their broker was selling their orders and to whom.

Regulators also paid more attention. The SEC and FINRA both issued guidance about when brokerages can restrict trading and what disclosures they must make. The rules are still not as strict as some advocates want — brokerages can still halt trading during volatile periods — but there is now more scrutiny of the practice.

What restrictions brokerages can still place on trading

Robinhood's halt was unusual in its scope and timing, but brokerages do have the legal right to restrict trading under certain circumstances. If a stock is halted by the SEC or an exchange, brokerages must stop trading it. If a customer's account is flagged for suspicious activity, the brokerage can freeze it. If a customer violates the brokerage's terms of service — for example, by day trading without the required account balance — the brokerage can restrict that activity.

What is less clear is whether a brokerage can halt trading on a specific stock for all customers just because of internal risk management or clearing house requirements. Robinhood argued it could, and regulators have not directly challenged that claim. But the SEC's settlement with Robinhood included language suggesting the agency expects brokerages to disclose when they are restricting trading and why, and to do so in real time rather than after the fact.

Most brokerages now have policies stating they will not halt trading on specific stocks except in extreme circumstances. Whether that policy is binding or just a public relations move remains unclear, because another extreme circumstance could arise and test whether brokerages will restrict trading again.

Frequently Asked Questions

Did Robinhood break the law by halting trading?

The SEC and FINRA did not say the halt itself was illegal, but they found that Robinhood failed to disclose its conflicts of interest and other compliance issues. The settlement required Robinhood to pay $70 million but did not include an admission of wrongdoing. Whether the halt was legal remains a question that could be tested in court if a lawsuit goes to trial.

Can other brokerages halt trading the same way?

Yes. All brokerages have the legal right to restrict trading under their terms of service, though most now say they will not do so except in extreme circumstances. The rules are the same for all brokerages — they are not specific to Robinhood.

Did Citadel or Melvin Capital tell Robinhood to halt trading?

There is no evidence that either firm directly told Robinhood to halt trading. Robinhood said the halt was driven by clearing house requirements and risk management. However, Robinhood does sell order flow to Citadel Securities, which created the appearance of a conflict of interest.

What should I do if my broker halts trading on a stock I want to buy?

First, check whether the halt is coming from the exchange or the SEC — if so, all brokerages will have the same restriction. If it is just your broker, contact their customer service to ask why and how long it will last. If you are unhappy with the answer, you can move your account to a different broker, though you may have to wait for the restriction to lift before you can sell your shares.

Has anything changed to prevent this from happening again?

Robinhood and other brokerages have made public commitments not to halt trading except in extreme circumstances, and regulators have increased scrutiny of when brokerages restrict trading. However, the rules have not changed fundamentally — brokerages still have the power to restrict trading, and the circumstances that would trigger another halt are not clearly defined.