Margin calls and short positions are fundamental concepts in trading that often intersect during periods of intense market volatility, putting some investors in serious trouble. At the heart of this is how margin accounts allow traders to borrow funds from a broker to increase the size of their trades, which amplifies both potential gains and losses.

When someone takes a short position, they borrow shares of a security from a broker and immediately sell them with the hope that the price will fall. If the share price does drop, the short seller can buy back the shares at a lower price, return them to the broker, and pocket the difference. However, if the price rises instead, the short seller faces theoretically unlimited risk, since the cost to buy back the shares could keep soaring.

Brokers require anyone taking on short positions to maintain a certain level of equity in their account, often through what’s called a margin requirement. The rules governing margin for short sales, outlined by Regulation T of the Federal Reserve, typically demand an initial deposit of at least 150% of the value of the position—this means the trader must post the full value of the borrowed shares, plus an extra 50% of that value in cash or eligible securities. After the initial transaction, a maintenance margin comes into play, setting the minimum amount of equity the investor must keep in the account as the market price of the underlying security moves.

A margin call happens when the value of the trader’s equity falls below the maintenance requirement. At that point, the broker contacts the investor and demands additional funds or securities to bring the margin account back up to the required level. If the investor fails to respond quickly, the broker is legally entitled to liquidate securities in the account—sometimes at unfavorable prices—to protect itself from further losses. This liquidation process can catch traders off guard and turn paper losses into realized ones very quickly.

Short positions get into real trouble when prices rise sharply—sometimes unexpectedly—causing equity to evaporate and triggering margin calls en masse. This scenario can spiral into what’s known as a short squeeze, where flurries of margin calls force short sellers to rush out and buy back shares to close their positions. Their collective buying adds upward pressure on the stock price, which can lead to even more margin calls and even sharper surges in price. High-profile examples of this dynamic include stocks like GameStop in early 2021, where a rapid increase in price devastated short positions and attracted widespread attention to the risks involved.

When many short sellers are caught in a squeeze, it often results from a combination of high short interest (meaning lots of traders have bet against the stock), sudden spikes in investor demand, and insufficient liquidity for short sellers to cover their positions at reasonable prices. Some short sellers may have to deposit significant amounts of cash or liquidate other holdings to meet margin calls, while others may simply be forced out of the market if they cannot raise additional collateral quickly enough.

Listening to industry experts like Charles Schwab, traders are often advised to use margin and short selling cautiously. It's critical to monitor account balances and market conditions closely, understanding that fast-moving markets can wipe out short sellers and trigger waves of margin calls that magnify volatility. In extreme cases, inability to meet a margin call not only liquidates the short position but can also lead to owing money to the broker if account losses exceed the deposited funds, which underscores just how dangerous these strategies can be if not managed carefully.

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