Euronext.liffe, the derivatives arm of transatlantic exchange NYSE Euronext, is set to double the number of indices gauging investors' fears over the prospects for European equities by offering trading in the implied volatility of each of the Dutch, Belgian and French stock markets for the first time.

The three new indices will be launched next month and will cover Amsterdam's AEX, Belgian's BEL 20 and the CAC 40 in France.