Short selling is a strategy where you profit from a falling stock. You borrow shares from your broker, sell them at the current price, then buy them back later — ideally cheaper — and return them, pocketing the difference. It’s how traders make money when they expect a price to drop.
It’s also one of the riskiest common strategies, because a stock can rise indefinitely — and your loss rises with it.
Why short selling is risky
When you buy a stock, the worst case is it goes to zero — you lose 100%. When you short, the worst case is the stock keeps rising, and there’s no ceiling. A stock that doubles costs a short seller 100%; one that triples costs 200%. Losses are theoretically unlimited, which is why shorting demands tight risk control and hard stops.
Short squeezes and borrowing costs
Two extra risks unique to shorting. A short squeeze happens when a rising price forces short sellers to buy back at once, driving the price even higher in a violent spiral. You also pay to borrow the shares — and hard-to-borrow stocks can cost a lot — plus you owe any dividends. Shorting isn’t just “buying in reverse”; it carries costs and dangers longs never face.
| Aspect | Short Selling |
|---|---|
| You profit when | Price falls |
| Max loss | Unlimited |
| Max gain | Capped (stock to $0) |
| Extra costs | Borrow fees, dividends owed |
The MTC take: shorting is a scalpel, not a hammer
Short selling can be highly profitable — markets fall faster than they rise — but the asymmetry is brutal. Capped upside, unlimited downside, and a squeeze that can gap against you overnight. That’s the opposite risk profile of a long. If you short, do it with a defined setup, a hard stop, and small size. Many traders get the same downside exposure with far less risk by buying puts instead.
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Frequently Asked Questions
What is short selling?
Short selling is a strategy to profit from a falling stock. You borrow shares from your broker, sell them at the current price, and later buy them back — hopefully cheaper — to return to the lender. Your profit is the difference between the sell price and the lower buy-back price.
How much can you lose short selling?
Losses on a short sale are theoretically unlimited. Because a stock’s price can rise without any ceiling, and you must eventually buy the shares back to close the position, a rising stock keeps increasing your loss. This is why short sellers use hard stops and small position sizes.
What is a short squeeze?
A short squeeze occurs when a heavily shorted stock rises sharply, forcing short sellers to buy shares to cover their positions. That buying pushes the price even higher, triggering more covering in a feedback loop. Squeezes can cause explosive, rapid price spikes that inflict severe losses on short sellers.
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