The world's fastest growing startups05/27/2015May 27, 20151. Slack (1.25) 2. Groupon (1.46) 3. Akamai Technologies (1.58) 4. Xiaomi Technologies (1.71) 5. Calient Technology (2.02) Source: PitchBookhttps://p.dw.com/p/1FWgtImage: picture alliance/ZBAdvertisement