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Short selling explained: How to short a stock

A beginner's guide to profitting from falling prices.

With the COVID-19 pandemic sending stock prices plunging across global markets, it’s worth understanding how advanced traders can continue to profit by short-selling stocks and indices.

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

While it varies from country to country, there are a few different ways to short sell stocks, from borrowing shares from a broker to trading put options and CFDs. Here, we give you an overview of what short selling means, how you can do it and the risks involved.

Important: Short selling is a controversial strategy and not everyone thinks it should be allowed. Some countries have banned it entirely. Either way, you look at it, short selling is for experienced traders only.

What is short selling?

The idea behind this investment strategy is that if you think a stock’s value is going to decrease, you can make money out of it. You borrow the stock from a broker, sell it at the market price, buy it back when the price has decreased, then give the stock back to its legitimate owner and keep the profit.

A quick example: Say you think CSL’s stock price is going to fall today. You borrow 10 CSL shares that cost $200 each and sell them at market price ($200 x 10 = $2,000). It turns out that you’re right and by the end of the day, they’re worth $180 each. So you buy them back for less than you sold them ($180 x 10 = $1,800), then give them back to the broker. You keep the profit, which is $2,000 – $1,800 = $200. Even after the fee that you have to pay to the broker for the stocks you borrowed, it’s a nice earning.

It sounds easy, but the problem is, things could also go the other way. If it turns out that you were wrong, and at the end of the day 1 CSL share is worth $210 instead ($210 x 10 = $2,100), you’ll lose money ($2,000 – $2,100 = -$100).

Traditional short-selling

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. For example, in Australia, the service is usually only available to wholesale investors, those that are either professional investors or are investing a minimum of around Au$500,000.

In New Zealand, the NZX Participant Rules define the conditions that you must meet if you short sell on the NZX. The “NZX can restrict/limit short-selling and an issuer can also place a short-selling restriction on its securities.” (NZX 2020). In Australia since the GFC, the Australian Securities and Investment’s Commission (ASIC) has clamped down heavily on short selling, so many brokers no longer offer it as a service.

Below is the traditional method for shorting a stock:

  1. Find a broker that offers short selling. Not all brokers facilitate short selling and not all stocks are available for borrowing, so you may have to do some research.
  2. Open a position to sell it. You buy it at the market price and it is held under a contractual lending arrangement.
  3. Keep an eye on the price. Getting distracted is a bad idea. You need to be ready to react quickly if things go wrong.
  4. Buy the stock back when you think it’s the right moment. You need to find a good risk/reward balance. When things are going well, it’s easy to become too greedy and wait too long to buy them back.
  5. Give the stock back and keep the profit (or sustain the losses). If the price goes down and you buy back for less, you have made money out of your short selling. If the price goes up, you lose money instead. Don’t forget that the risk is all on you.

Short selling through online trading platforms

Many traders prefer to short sell through online share trading platforms. There are two key ways to do this:

  • Contracts for difference. CFDs are derivative investment products that allow you to speculate on prices without actually owning the shares, which means that CFD traders can profit whether the prices of stocks, commodities or currencies are going up or down. Bear in mind, it pays to be aware that CFDs are complex and risky financial instruments and many investors lose money this way.
  • Options trading. You can purchase an option on a stock that allows you to sell it at the initial market price within the option’s expiry date. If the price goes down, you sell, buy back at the new price and make a profit. If the price goes up, you don’t sell at all and only lose the value of the option, thus limiting the risk. With traditional short selling, you can buy back whenever you want (unless the owner of the stock claims it back), whereas options normally have a fairly short expiry date.

Risks of short selling a stock

Repeat after us: short selling is for expert investors and you shouldn’t do it unless you do know what you’re doing.

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

It’s especially dangerous if a lot of people are short selling shares 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 isn’t free. Brokers charge a fee for lending stocks, and there are fees for other short-selling methods too. Be aware that these 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 that 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 in the long run for the income. To avoid your portfolio falling in value (without selling the shares), you could short the stocks through a CFD or put options to the amount you think they will fall – and so offset any losses.

Compare online CFD and options brokers

Name Product Minimum Opening Deposit Minimum Opening Deposit Commission Available Markets Platforms
Plus500 CFD
NZ 200
No commission
Indices, FX, Shares, Commodities, Cryptocurrency, ETFs, Options
Plus500 WebTrader
CFD Service. Your capital is at risk.
Trade CFDs on shares, forex, crypto, indices, commodities and more.
CMC Markets CFD
0.10% with a NZ$ 7 minimum
Indices, FX, Commodities, Cryptocurrency, Treasuries, ASX shares, Global shares
MetaTrader 4,CMC Next Generation
CFD Service. Your capital is at risk.
Trade CFDs on shares, forex, cryptocurrency, indices, commodities and more.
BlackBull Markets CFD
USD 200
No commission
Indices, FX, Commodities, Precious metals
MetaTrader 4, MetaTrader 5
CFD Service. Your capital is at risk.
Trade CFDs on shares, forex, indices, commodities, precious metals and more.
IG Markets CFDs
0.08% with $7 minimum
Indices, FX, Shares, Commodities, Cryptocurrency, Options, ETPs
MetaTrader 4, ProRealTime
CFD Service. Your capital is at risk.
Trade from over 17,000 markets with a leading service for CFD trading and forex.

Compare up to 4 providers

Name Product Minimum Opening Deposit Minimum Spreads for Major Currencies Commission Minimum Trade Size Platforms
BlackBull Markets Forex Trading
USD 200
0.0 - 0.8 pips
0.01 lots
MetaTrader 4, MetaTrader 5
Margin FX is a complex financial product and traders are at high-risk of losing all of or more than their initial investment. Trade up to 64 currency pairs with a New Zealand registered and based provider.
Plus500 Forex Trading
NZ 200
Variable and adjusted according to market spread.
Varies with instrument
Plus500 WebTrader
CFD Service. Your Capital is at risk. Margin FX is a complex financial product and traders are at high-risk of losing all of or more than their initial investment. Open an account and experience Plus500's easy-to-use proprietary trading platform, 24/7 online chat support and free real-time forex quotes.
IG Forex Trading
0.6 - 1.5 pips
1 lot
MetaTrader 4, ProRealTime
Margin FX is a complex financial product and traders are at high-risk of losing all of or more than their initial investment.Choice of trading platforms. Choose optional extras like advanced charting, reporting and order types. Over 90 currency pairs to choose from.

Compare up to 4 providers

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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