German exchange group Deutsche Börse has kept up the pressure on emerging trading rival Turquoise by relaxing its rules on opening times after Turquoise, set to launch in September, yesterday reversed a plan to open earlier than the German market.

The exchange council of Deutsche Börse's has passed a regulation that would allow trading to begin earlier than the current time of 07:00 GMT, although it said that it would “support keeping the start of trading unchanged".