What Is Short Selling?
Betting against a stock sounds risky – and it is. Learn how short selling works and why most investors should avoid it.
Category: advanced-strategies · Difficulty: advanced · Read time: 6 min read
Topics: short selling, shorting, hedge funds, risk, margin
What Is Short Selling?
Short selling is a way to profit when a stock's price goes DOWN. While most investors "buy low, sell high," short sellers try to "sell high, buy low" – in that order.
How Short Selling Works
The Basic Process
1. **Borrow shares** from your broker 2. **Sell those borrowed shares** immediately at the current price 3. **Wait** for the price to drop 4. **Buy back the shares** at the lower price 5. **Return the shares** to your broker 6. **Keep the difference** as profit
Example
You think XYZ stock (currently $100) is overvalued:
1. Borrow 100 shares of XYZ from your broker 2. Sell them for $100 × 100 = $10,000 3. Stock drops to $70 4. Buy back 100 shares for $70 × 100 = $7,000 5. Return shares to broker 6. **Profit: $3,000** (minus fees and interest)
Why Short Selling Is Risky
Unlimited Loss Potential
When you buy a stock, the most you can lose is 100% (if it goes to $0).
When you short a stock, there's no limit to how much you can lose. If you short at $100 and the stock goes to $500, you've lost 400% of your original position.
**The math is brutal:**
- Short XYZ at $100
- XYZ rises to $300
- Loss: ($300 - $100) × 100 shares = **$20,000 loss**
- That's double your original $10,000 position
Borrowing Costs
You pay interest on the borrowed shares. For hard-to-borrow stocks, this can be 10%, 20%, or even 100%+ per year.
Margin Requirements
Short selling requires a margin account. If the stock rises, your broker may issue a **margin call**, forcing you to add more money or close your position at a loss.
Short Squeezes
If a heavily shorted stock starts rising, short sellers rush to cover (buy back shares). This buying pressure pushes the price up even faster, causing more short sellers to cover – a vicious cycle called a "short squeeze."
**GameStop (2021)** was a famous example where short sellers lost billions in a squeeze.
Who Short Sells?
Hedge Funds
Professional investors use shorts to:
- Profit from overvalued stocks
- Hedge long positions
- Implement market-neutral strategies
Day Traders
Some active traders short stocks for quick profits, though most fail.
Not Most Individual Investors
The asymmetric risk (unlimited losses vs. limited gains) makes short selling unsuitable for most people.
Alternatives to Short Selling
If you're bearish on a stock or the market:
Put Options
Buy a put option – gives you the right to sell at a specific price. Maximum loss is limited to what you paid for the option.
Inverse ETFs
Funds designed to move opposite to an index. For example, SH moves opposite to the S&P 500. No margin required, limited to losing your investment.
Simply Don't Own It
The easiest "short" is to just not own something you're bearish on. Invest elsewhere instead.
The Bottom Line
Short selling is:
- **Legal** but controversial
- **Extremely risky** with unlimited loss potential
- **Expensive** with borrowing costs and margin requirements
- **Best left to professionals** who can manage the risks
For most investors, betting against stocks is a losing game. Focus on finding good investments to own rather than trying to profit from others' failures.
If you're convinced a stock is overvalued, the safest move is simply not to own it – not to short it.