Short Selling

Stock trading dictionary: meaning, example and how traders use it.

Last updated: October 17, 2026

Definition: Short selling is a strategy in which an investor borrows shares, sells them at the current price, and aims to buy them back later at a lower price, returning them to the lender and keeping the difference as profit.

How short selling works

To sell short, you need a margin account with a broker. The broker locates shares to borrow, often from other clients' accounts or institutional lenders, and you sell them in the market. Later you "cover" by buying the same number of shares and returning them. Under SEC Regulation SHO, brokers must have reasonable grounds to believe the shares can be borrowed before accepting a short sale.

While the position is open, you owe any dividends paid on the shares to the lender and may pay a borrow fee, which can be high for hard-to-borrow stocks.

Short selling example

Suppose a stock trades at $80 and you short 100 shares, receiving $8,000. If the price falls to $60, you buy back 100 shares for $6,000 and return them, keeping a $2,000 profit before fees and interest. If instead the stock rises to $110, covering costs $11,000, a $3,000 loss. Because there is no ceiling on how high a stock can go, the potential loss on a short position is theoretically unlimited.

Risks of short selling

  • Unlimited loss potential, as shown above.
  • Margin calls: if the price rises, the broker may require more collateral or close the position.
  • Short squeezes: a sharp rally forces short sellers to buy back shares, which pushes prices even higher.
  • Recall risk: the lender can ask for the shares back, forcing you to cover at an inconvenient time.
  • Costs: borrow fees, margin interest, and dividend payments reduce returns.

What is a short squeeze?

A short squeeze happens when a heavily shorted stock rises quickly and short sellers rush to buy shares to limit their losses. That buying adds to demand, pushing the price higher still and forcing more shorts to cover. Squeezes are more likely when short interest is large relative to the shares available to trade, often measured by short interest as a percentage of float or by days to cover. Positive news, a surge of retail buying, or a recall of borrowed shares can trigger one. Squeezes can produce extreme price moves over days or even hours, and they often reverse once the covering ends.

Why investors short sell and alternatives

Short sellers may be speculating on overvalued or troubled companies, hedging a long portfolio, or running market-neutral strategies. Short selling also contributes to price discovery and liquidity. Investors who want bearish exposure with capped risk often use a put option instead, where the maximum loss is the premium paid.

Frequently asked questions

How do short sellers make money?

They borrow shares, sell them at the current price, and profit if they can buy them back later at a lower price, after paying borrow fees, interest, and any dividends owed.

Why is short selling risky?

A stock's price can rise without limit, so losses on a short position have no theoretical cap. Margin calls and short squeezes can force a short seller to cover at a large loss.

Is short selling legal?

Yes, short selling is legal in the US and regulated by the SEC, including rules that require brokers to locate shares to borrow. Naked short selling that violates these rules is prohibited.

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For information only, not investment advice. See the disclaimer.