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Investopedia / Madelyn Goodnight
A hedge is an investment that is made with the intention of reducing the risk of adverse price movements in an asset. Normally, a hedge consists of taking an offsetting or opposite position in a related security.

Hedging is somewhat analogous to taking out an insurance policy. If you own a home in a flood-prone area, you will want to protect that asset from the risk of flooding—to hedge it, in other words—by taking out flood insurance. In this example, you cannot prevent a flood, but you can plan ahead of time to mitigate the dangers in the event that a flood did occur.
There is a risk-reward tradeoff inherent in hedging; while it reduces potential risk, it also chips away at potential gains. Put simply, hedging isn’t free. In the case of the flood insurance policy example, the monthly payments add up, and if the flood never comes, the policyholder receives no payout. Still, most people would choose to take that predictable, circumscribed loss rather than suddenly lose the roof over their head.
In the investment world, hedging works in the same way. Investors and money managers use hedging practices to reduce and control their exposure to risks. In order to appropriately hedge in the investment world, one must use various instruments in a strategic fashion to offset the risk of adverse price movements in the market. The best way to do this is to make another investment in a targeted and controlled way. Of course, the parallels with the insurance example above are limited: In the case of flood insurance, the policy holder would be completely compensated for her loss, perhaps less a deductible. In the investment space, hedging is both more complex and an imperfect science.
A perfect hedge is one that eliminates all risk in a position or portfolio. In other words, the hedge is 100% inversely correlated to the vulnerable asset. This is more an ideal than a reality on the ground, and even the hypothetical perfect hedge is not without cost. Basis risk refers to the risk that an asset and a hedge will not move in opposite directions as expected. “Basis” refers to the discrepancy.
The most common way of hedging in the investment world is through derivatives. Derivatives are securities that move in correspondence to one or more underlying assets. They include options, swaps, futures, and forward contracts. The underlying assets can be stocks, bonds, commodities, currencies, indexes, or interest rates.
Derivatives can be effective hedges against their underlying assets because the relationship between the two is more or less clearly defined. It’s possible to use derivatives to set up a trading strategy in which a loss for one investment is mitigated or offset by a gain in a comparable derivative.

For example, if Morty buys 100 shares of Stock PLC (STOCK) at $10 per share, he might hedge his investment by buying a put option with a strike price of $8 expiring in one year. This option gives Morty the right to sell 100 shares of STOCK for $8 any time in the next year. Let's assume he pays $1 for the option, or $100 in premium. If one year later STOCK is trading at $12, Morty will not exercise the option and will be out $100. He's unlikely to fret, though, because his unrealized gain is $100 ($100 including the price of the put). If STOCK is trading at $0, on the other hand, Morty will exercise the option and sell his shares for $8, for a loss of $300 ($300 including the price of the put). Without the option, he stood to lose his entire investment.
The effectiveness of a derivative hedge is expressed in terms of delta, sometimes called the “hedge ratio.” Delta is the amount the price of a derivative moves per $1 movement in the price of the underlying asset.
Fortunately, the various kinds of options and futures contracts allow investors to hedge against almost any investment, including those involving stocks, interest rates, currencies, commodities, and more.
The specific hedging strategy, as well as the pricing of hedging instruments, is likely to depend upon the downside risk of the underlying security against which the investor would like to hedge. Generally, the greater the downside risk, the greater the cost of the hedge. Downside risk tends to increase with higher levels of volatility and over time; an option that expires after a longer period and is linked to a more volatile security will thus be more expensive as a means of hedging.
In the STOCK example above, the higher the strike price, the more expensive the put option will be, but the more price protection it will offer as well. These variables can be adjusted to create a less expensive option that offers less protection, or a more expensive one that provides greater protection. Still, at a certain point, it becomes inadvisable to purchase additional price protection from the perspective of cost effectiveness.
Using derivatives to hedge an investment enables precise calculations of risk, but requires a measure of sophistication and often quite a bit of capital. Derivatives are not the only way to hedge, however. Strategically diversifying a portfolio to reduce certain risks can also be considered a hedge, albeit a somewhat crude one. For example, Rachel might invest in a luxury goods company with rising margins. She might worry, though, that a recession could wipe out the market for conspicuous consumption. One way to combat that would be to buy tobacco stocks or utilities, which tend to weather recessions well and pay hefty dividends.
This strategy has its trade offs: If wages are high and jobs are plentiful, the luxury goods maker might thrive, but few investors would be attracted to boring countercyclical stocks, which might fall as capital flows to more exciting places. It also has its risks: There is no guarantee that the luxury goods stock and the hedge will move in opposite directions. They could both drop due to one catastrophic event, as happened during the financial crisis, or for two unrelated reasons.
In the index space, moderate price declines are quite common, and they are also highly unpredictable. Investors focusing in this area may be more concerned with moderate declines than with more severe ones. In these cases, a bear put spread is a common hedging strategy.
In this type of spread, the index investor buys a put that has a higher strike price. Next, she sells a put with a lower strike price but the same expiration date. Depending upon the way that the index behaves, the investor thus has a degree of price protection equal to the difference between the two strike prices (minus the cost). While this is likely to be a moderate amount of protection, it is often sufficient to cover a brief downturn in the index.
Hedging is a technique used to reduce risk, but it’s important to keep in mind that nearly every hedging practice will have its own downsides. First, as indicated above, hedging is imperfect and is not a guarantee of future success, nor does it ensure that any losses will be mitigated. Rather, investors should think of hedging in terms of pros and cons.
Do the benefits of a particular strategy outweigh the added expense it requires? Because hedging will rarely if ever result in an investor making money, it’s worth remembering that a successful hedge is one that only prevents losses.
For most investors, hedging will never come into play in their financial activities. Many investors are unlikely to trade a derivative contract at any point. Part of the reason for this is that investors with a long-term strategy, such as those individuals saving for retirement, tend to ignore the day-to-day fluctuations of a given security. In these cases, short-term fluctuations are not critical because an investment will likely grow with the overall market.
For investors who fall into the buy-and-hold category, there may seem to be little to no reason to learn about hedging at all. Still, because large companies and investment funds tend to engage in hedging practices on a regular basis, and because these investors might follow or even be involved with these larger financial entities, it’s useful to have an understanding of what hedging entails so as to better be able to track and comprehend the actions of these larger players.
Hedging is a strategy that tries to limit risks in financial assets. It uses financial instruments or market strategies to offset the risk of any adverse price movements. Put another way, investors hedge one investment by making a trade in another.
Purchasing insurance against property losses, using derivatives such as options or futures to offset losses in underlying investment assets, or opening new foreign exchange positions to limit losses from fluctuations in existing currency holdings while retaining some upside potential are all examples of hedging. 
In the investing, hedging is complex and thought of as an imperfect science. A perfect hedge is one that eliminates all risk in a position or portfolio. In other words, the hedge is 100% inversely correlated to the vulnerable asset. But even the hypothetical perfect hedge is not without cost.
Hedge Funds
Options and Derivatives
Risk Management
Investing
Options and Derivatives
Trading
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