What is Vix – the fear index?
What is Vix? We explain how the fear index could guide your investment decisions.
One trading indicator that is very popular during moments of market uncertainty is the CBOE Volatility index, which is sometimes known as Vix or even called the “fear index”. Vix is calculated from the price of 30-day call and put options on S&P 500 futures traded on the Chicago Board Options Exchange.
Call options give you the right, but not the obligation, to buy a specific asset at a set price at a set time, while put options give you the right to sell. In other words, it gauges the cost of taking out insurance against price moves in either direction: the greater the cost, the bigger the implied volatility. The index’s long-term average is around 21.
However, while the formula for working out Vix is pretty straightforward, traders don’t agree on how to interpret it. The simplest view is that the higher the Vix, the more volatility traders expect, and the more you should think about selling. However, contrarian investors argue that a high Vix can be a sign that people may be too cautious, which in turn suggests that it is time to buy.
MoneyWeek
Subscribe to MoneyWeek today and get your first six magazine issues absolutely FREE
Sign up to Money Morning
Don't miss the latest investment and personal finances news, market analysis, plus money-saving tips with our free twice-daily newsletter
Don't miss the latest investment and personal finances news, market analysis, plus money-saving tips with our free twice-daily newsletter
Because Vix itself can be extremely volatile, many people prefer to take a rolling average rather than the daily figure. There have been two key studies on using Vix as a trading indicator. One, by Duncan Lamont of asset management group Schroders, found that a switching strategy based on moving into bonds when the Vix exceeded 35 would have lagged the market, returning 7.6% between 1990 and 2020 compared with 9.9% earned from staying fully invested. But Butler University found that while switching would have lowered the raw return in most cases, it would have cut volatility by even more, leading to a risk-adjusted excess return.
This article was first published in MoneyWeek's magazine. Enjoy exclusive early access to news, opinion and analysis from our team of financial experts with a MoneyWeek subscription.
Related articles
- Should we worry about the Vix 'fear gauge'?
- Like it or not, you’re probably on the wrong side of the market
- Beware of a quick Vix
- Investors turn to gold to beat inflation
Get the latest financial news, insights and expert analysis from our award-winning MoneyWeek team, to help you understand what really matters when it comes to your finances.

-
UK sets out crypto regulatory proposalsThe government has tabled legislation that sets out a regulatory framework for cryptocurrencies, while the regulator will consult on balancing innovation and consumer protections
-
What does an interest rate cut mean for my pension?Interest rates have been cut from 4% to 3.75%. For pension savers and retirees the effects of the drop will depend on the type of retirement pot they have, but could be significant.
-
British blue chips offer investors reliable income and growthOpinion Ben Russon, portfolio manager and co-head UK equities, ClearBridge Investments, highlights three British blue chips where he'd put his money
-
Coreweave is on borrowed timeAI infrastructure firm Coreweave is heading for trouble and is absurdly pricey, says Matthew Partridge
-
Renewable energy funds are stuck between a ROC and a hard placeRenewable energy funds were hit hard by the government’s subsidy changes, but they have only themselves to blame for their failure to build trust with investors
-
Profit from document shredding with RestoreRestore operates in a niche, but essential market. The business has exciting potential over the coming years, says Rupert Hargreaves
-
The war dividend – how to invest in defence stocks as the world arms upWestern governments are back on a war footing. Investors should be prepared, too, says Jamie Ward
-
Literacy Capital: A trust where great returns fund a good causeThere’s plenty to like about specialist private-equity trust Literacy Capital, says Max King
-
An AI bust could hit private credit – could it cause a financial crisis?Opinion Private credit is playing a key role in funding data centres. It may be the first to take the hit if the AI boom ends, says Cris Sholto Heaton
-
8 of the best ski chalets for sale nowThe best ski chalets on the market – from a traditional Alpine-style chalet in Switzerland to an award-winning Modernist building in Japan’s exclusive ski areas