The Earnings Ratio Condor
Just as it is common for at-the-money implied volatility to rise leading up into an earnings announcement (as discussed in The Earnings Straddle in Different Flavors), it is also common for the curvature of the volatility skew to become more pronounced. This latter phenomenon is perhaps less common than the former and is certainly more difficult to identify (and to trade, for that matter), but that is not to say that it doesn’t exist and can't be exploited.
Allow to me to explain with an illustration. Below is a mockup of the vertical skew of a typical big name stock going into earnings.
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