March 20 (Reuters) - Kraken, one of the world's largest cryptocurrency exchanges, said on Thursday it would buy retail futures trading platform NinjaTrader for $1.5 billion, in a deal that would allow ...

The cryptocurrency exchange Kraken agreed to a $1.5 billion deal for NinjaTrader, a U.S. retail futures trading platform, in a bid to expand its user base and move into other asset classes.