There’s no doubt US tech stocks have thrived in 2020, but a raft of their European counterparts have returned huge profits for investors during the first six months of this year. Sinch, the Stockholm-based cloud telecoms firm, is up a teeth-kissing 170% year-to-date. Second-best is Dutch fintech play Adyen: its market cap grew from $223 billion to $389.4 billion, driving its stock price up by 74%.