In a Bank of England Financial Stability Paper, Olga Cielinska, Andreas Joseph, Ujwal Shreyas, John Tanner and Michalis Vasios analyze transactions on the Swiss Franc foreign exchange over-the-counter derivatives market around January 15, 2015, the day when the Swiss National Bank de-pegged the Swiss Franc. From the abstract:
The removal of the floor led to extreme price moves in the forwards market, similar to those observed in the spot market, while trading in the Swiss franc options market was practically halted. We find evidence that the rapid intraday price fluctuation was associated with poor underlying market liquidity conditions, in particular the limited provision of liquidity by dealer banks in the first hour after the event. Looking at longer-term effects, we observe a reduced level of liquidity, associated with an increased level of market fragmentation, higher market volatility and an increase in the degree of collateralisation in the weeks following the event.
