The Fed meeting staged no major fireworks in FX beyond the initial knee jerk. Oil markets are remaining quite jittery with the overall setup so far supportive of petro currencies. We argue that such backdrop should keep a lid on petrocurrencies selloffs, if any, and by extension pose a unique opportunity for fading rich USD/petro skews (i.e. firm oil should put downside pressure and/or suppress USD/ccy up moves).
In the past we discussed USD/high beta put ratio spreads which are set up as net short vol structures on safe side of the skew and tend to exhibit attractive Sharpe ratios but are slow in harvesting P/L. This week bounce in oil, which according to our analysts should stick for longer, provides fertile environment to more aggressively collect skew theta in such pairs as USDMXN and USDRUB, via outright selling of risk reversals (more risky proposition considering that trailing spot-vol correlations have been performing) or via our preferred 1*2 ratio call spreads, delta-hedged. The1*2 ratio call spread structure is still exposed to blowups (left tail risk), thus tactically appropriate only as long as the petrocurrencies remain well anchored by the recent oil supply shock.
The 1st chart shows systematically strong performance of delta-hedged 1*2 ratio call spreads outside of the left tail episodes which hit RUB on a number of occasions (devaluation, sanctions, global risk offs).
The analysis in 2nd diagram shows that 1*1.5 and 1*2 structures capture the bulk of the Sharpe Ratio benefits. We assess the performance over last 10 year period, inclusive of the risk off episodes. Going further out and reducing relative weight on the long vol (nearer strike) leads to diminishing of the built-in protection of the ratio call spread structure during the risk off episodes resulting. Overall, 1:1.5 to 1:2 are the sweat spot among the 1*N ratio call spread structures. Hence we consider:
Sell 3M USD/MXN 25D risk reversal, delta-hedged @2.05/2.3 indic
or as a safer alternative:
Own 3M USD/MXN ATM/25D 1*2 ratio call spread @10.15ch vs @11.4/11.65 indic, delta-hedged, in vega notionals. Courtesy: JPM


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