The value of European stock trading activity so far in 2015 has leapt nearly 25% from a year ago, continuing the momentum built up by the end of 2014 and mirroring strong gains in the value of major equity indices.

European stocks worth €3.4 trillion were traded between January 1 and March 26 this year, according to technology provider Fidessa, whose data includes volumes traded on public exchanges and regulated dark pools, or multilateral trading facilities that are operated by many exchanges and brokers.