BERLIN :German defence start-up Helsing has raised 600 million euros ($693.30 million) in its latest investment round, lead by Spotify founder Daniel Ek, the firm said on Tuesday. The latest investment round has raised Helsing's value to $12 billion, the Financial Times reported on Tuesday, citing people familiar with the matter. This positions the start-up among the top five private tech companies in Europe, the FT added. The investment round was lead by Prima Materia, an investment company