What are Risk Reversals:

Risk reversals are the difference in volatility between similar (in expiration and relative strike levels) FX calls and put options. The measurement is calculated by finding the difference between the implied volatility of a call with a 25 Delta and a put with a 25 Delta. When Risk Reversals are skewed to the downside, it suggests volatility and therefore demand is greater for puts than for calls (as implied volatility for puts is quoted as a negative percentage and implied volatility for calls is quoted as a positive percentage) and traders are expecting the pair to fall; and visa versa.

We use risk reversals on USDJPY as it is the benchmark yen pair and the Japanese currency is considered the proxy funding currency for carry trader. When Risk Reversals grow more extreme to the downside, there is greater expectations for the yen to gain – an unfavorable condition for carry trades.