The VIX is asymmetric, its distribution is non-symmetrical, it is skewed because it has very wide swings. The volatility of volatility is very volatile. There is an asymmetric relationship between stock index returns and the VIX. This asymmetric relationship is what initially makes the VIX interesting for hedging against S&P 500 volatility and losses.
Since I started the series about the extremely low VIX level Monday, like The VIX, as I see it…, The VIX has gained 17% while the S&P 500 stock index has lost about 1%. The VIX is asymmetric. While the VIX isn’t always a perfect opposite movement to the stock indexes, it most often does correlated negatively to stocks. When stocks fall, the implied (expected) volatility increases, so the VIX increases. Asymmetry is imbalance: more of one thing, less of the other. For example, more profit potential, less loss or more upside, less downside.
An advantage of the VIX for hedging is that it is asymmetric: it increases more than stocks fall. For example, when we look at historical declines in the stock index we find the VIX normally gains much more than the stock index falls. For example, if the stock index declined 5% the VIX may have gained 30% over the same period. That ratio of asymmetry of 6 times more drift would allow us to tie up less cash for a hedge position. Of course, the ratio is different each time. Sometimes it moves less, sometimes more.
When the VIX is at a low enough level as its been recently, the asymmetric nature of the VIX makes it an interesting hedge for an equity portfolio. The best way to truly hedge a portfolio is to hedge its actual holdings. That’s the only true hedge. If we make a bet against an index and that index doesn’t move like our positions, we still have the risk our positions fall and our hedge does too, or doesn’t rise to offset the loss. I always say: anything other than the price itself has the potential to stray far from the price. But the asymmetry of VIX, its potential asymmetric payoff, makes it another option if we are willing to accept it isn’t a direct hedge. And, that its derivatives don’t exactly track the VIX index, either. None of the things we deal with are a sure thing; it’s always probabilistic.
This week has been a fine example of vix asymmetry. The chart below shows it well.
chart source: http://www.stockcharts.com
Note: The VIX is an unmanaged index, not a security, so it cannot be invested in directly. We can gain exposure to the VIX through derivatives futures or options. This is not a recommendation to buy or sell VIX derivatives. To determine whether or not to take a long or short position in the VIX requires significantly more analysis than just making observations about its current level and direction. For example, we would consider the term structure and implied volatility vs. historical volatility and the risk/reward of any options combinations.