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Short selling explained: How to short a stock

A beginner's guide to profiting from falling prices.

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Short selling gets a bad rap in the investment world because traders are benefiting from a company’s loss. However, you can use this strategy to offset your own losses during a stock market crash. This can be particularly useful for investors holding a portfolio of dividend stocks that they’d prefer not to sell as prices fall.

While it varies from country to country, there are a few different ways to short sell stocks — and there are risks involved.

What is short selling?

The idea behind this investment strategy is that if you think a stock’s value will decrease, you can make a profit. You do this by borrowing a stock from a broker and selling it at the market price. Once the price decreases, buy it back and return it to the legitimate owner — and pocket the profit.

Crunching the numbers: How short selling works

Here’s an example of a short sale profit when you think MSFT stock price will fall.

Borrow 10 MSFT stocks that cost $175 each and sell them at market price.
$175 x 10 = $1,750

  • If you’re right, and the stocks are worth $165 each by the end of the day, buy them back for less than you sold them, and return them to the broker. $165 x 10 = $1,650

    You keep the profit. $1,750–$1,650 = $100

    Even after a potential broker fee, it’s a nice profit.

  • The risk comes if things don’t go your way.

    If you’re wrong and 1 MSFT stock is worth $185 instead. $185 x 10 = $1,850

    You’ll lose money. $1,750–$1,850 = -$100

Yes, short selling is legal in most financial markets. While some countries in Europe and Asia have temporarily banned short selling of certain assets during times of financial crisis, like in 2008 and 2020, it’s still legal in the US.

Short selling is often misunderstood and sometimes blamed for market crashes, though its actual role in a market crash has been studied and debated, with some economists concluding that it plays an important role in the process of price discovery.

Naked short selling is illegal

As with many other areas of the stock market, short selling can become complex in some situations, and the practice of naked short selling is against the law. Naked short selling is when a stock broker or dealer borrows a stock to sell without verifying that the stock actually exists or legally belongs to the entity it’s borrowing from.

It is illegal to borrow a stock to be shorted and then not deliver it when it’s time to buy back. There’s concern that naked short selling has become a problem in today’s markets.

How to sell a stock short

The traditional means of shorting a stock directly is to contact a full-service broker or a major investment fund such as Morgan Stanley. Full-service brokers usually offer advice alongside trading — and they charge a premium price for the service.

Modern online brokerage accounts have made it easy to short a stock by selecting it as the order type. Here is the general process for shorting a stock:

  1. Find a broker or brokerage account that offers short selling. Not all brokers will facilitate short selling and not all stocks are available for borrowing, so you may have to do some research.
  2. Enter the order. Choose a market or limit order, the number of stocks and any other details. The stocks sold short are held under a contractual lending arrangement, which may require a stock loan fee. Your brokerage could also require you to have a margin account, or cash collateral equal to an additional percentage of the stock price to protect you if the trade goes against you.
  3. Keep an eye on the price. Watching the prices help you react quickly if things go wrong.
  4. Buy the stock back at the right moment. Find a good risk and reward balance. When things are going well, it’s easy to become too greedy and wait too long to buy back.
  5. Return the stock and keep the profit — or sustain the loss. The risk falls back on you. If the stock price falls, you make money — and you lose money if the price increases.

Other ways to profit from a falling stock price

As financial markets have developed, new ways of achieving the same goal as short selling have been introduced. Consider how each one might help you achieve your investing goals.

Buy a put option

The most popular alternative to shorting a stock is to buy a put option on it. Put options allow traders to pay a small percentage of the stock price, called a premium, for the option to sell the stock at the stated strike price at the predefined future date. This date can range from a week or month to several months or years.

If the stock price has fallen when that date arrives, you can exercise the option and profit on the difference between the lower market price and the option strike price, minus the cost of the premium. Or you can sell back the option at the market price at any time before it expires.

If the stock price has risen, however, the option expires worthless on its expiration day and you lose the premium you paid.

Sell a call option

If you already own stocks in a company that you think will suffer a drop in stock price, you can sell a call option that earns you the premium paid by the buyer. This offsets some or all of your losses, but it obligates you to sell your stocks at the strike price on expiration day if the trade goes against you and the stock price continues to rise.

Or you can speculate and sell a call option without owning the stocks. This is called selling a naked call or naked call writing. Your broker will likely require you to have a margin account or receive special authorization to sell naked calls prior to making the trade. This strategy assumes that you’ll buy back the call option in the future or buy the stocks at a future market price before expiration day to exercise the option.

For select indexes or themes, buy an inverse ETF

Inverse ETFs are a relatively new investment that aims to gain when the underlying asset price declines. They exist as a complement to regular ETFs on popular indexes like the S&P 500, Dow Jones Industrial Average and NASDAQ 100, as well as market sector ETFs and leveraged ETFs.

Buying an inverse ETF achieves the same goal as shorting the ETF, but without some of the risks.

Leveraged ETFs, whether they’re inverse or not, are designed for short-term trades only and should not be bought and held. Leveraged ETFs are rebalanced daily, and sustained ups and downs during volatile periods will erode the asset base and degree of exposure of the ETF. This means that its ability to rebound after each loss is diminished over time.

What about CFDs?

In some countries, contracts for difference (CFDs) allow you to speculate on stock prices without actually owning the stocks, meaning you could bet on a decline in a stock price similarly to selling it short. However, CFDs are not allowed in the US.

Risks of short selling

Short selling is for experienced investors and you shouldn’t do it unless you know what you’re doing.

The reason it’s considered so risky is that you could lose “infinite” money. When you buy a stock and “go long,” the maximum you can lose is the amount you invested. When you “go short” instead, there are theoretically no limits to how much the stock price could go up, and thus to how much you could lose.

It’s especially dangerous if a lot of people are short selling stocks from the same company and the price unexpectedly goes up. At that point, everyone will start buying back quickly, causing the stock to go up even more. It’s what’s called a “short squeeze” and it easily becomes a vicious cycle that turns out very expensive for short sellers.

Finally, don’t forget that short selling may not be free. Brokers may charge a fee for lending stocks, and there are fees for other short selling methods too. Be aware that these will partially lower your gains and increase your losses.

Protecting your portfolio

Say you hold a portfolio of stocks and you predict that a market crash is coming or a company’s stock is going to fall. To avoid losses to your portfolio, one option is to sell the stocks of the companies you hold before their prices drop – if you can get the timing right.

However, if you hold dividend stocks, you might prefer to keep them for the long run for the income. To avoid your portfolio falling in value without selling the stocks, you could short the stocks by buying put options or selling call options, offsetting any losses.

Bottom line

The stock market moves in all directions, and short-selling can help you take advantage of downtrends or bear markets. Depending on your investment goals and strategy, there are a number of ways to capture gains on falling prices.

Evaluate which ones might be suitable for you and then compare online trading platforms that best fit the style of trading you want to do.

Frequently asked questions

Disclaimer: This information should not be interpreted as an endorsement of futures, stocks, ETFs, CFDs, options or any specific provider, service or offering. It should not be relied upon as investment advice or construed as providing recommendations of any kind. Futures, stocks, ETFs and options trading involves substantial risk of loss and therefore are not appropriate for all investors. Trading CFDs and forex on leverage comes with a higher risk of losing money rapidly. Past performance is not an indication of future results. Consider your own circumstances, and obtain your own advice, before making any trades.

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