When comparing to 2013, tech start-ups in Europe are now seemingly looking a lot more attractive to investors. According to a new report from GP. Bullhound, four years ago, the largest funding round was Spotify's securing of $250 million, adding to a total of $700 million for the largest five rounds of the year. Already in the first half of 2017, this figure is at $2.1 billion. Top of the list is British tech firm Improbable, having received $502 million. Not so far behind is German company Delivery Hero, which has received an injection of $423 million. Although Unity Technologies is now based in San Francisco, its origins lie in Copenhagen, Denmark. The game engine developer has had a round of $400 million.