Sterling volatility has reached a six-year high as the EU referendum looms, while nearly all other volatility measures are also climbing, according to S&P Dow Jones Indices.
The implied volatility of the CME/CBOE FX GBP Volatility index rose by a third compared to last month to 15.79, as the June referendum date came within the one month reference period for the sterling's volatility measure.
Tim Edwards, director of index investment strategy at S&P Dow Jones Indices said: "Given the betting markets are indicating that the probability of a Brexit is no higher than 33%, the markets are anticipating an unusually rocky ride.
"For comparison: at 15.79, the implied volatility of the UK's currency is currently higher than that of the Dow Jones Industrial Average."
Meanwhile the VIX, a measure of equity market volatility, was recorded at around 15.95, its highest level since mid-March, and nearly all other volatility measures were higher than last month.
However, oil volatility has continued to grind lower with the continued recovery in energy prices. This, combined with sterling weakness, helped to stabilize the US high yield credit market.
"The S&P/ISDA US High Yield CDS index remains elevated, but appears to have halted its rise," Edwards said.