Valuation: $925 million
Total raised to date: $220.04 million
Year founded: 2011
HQ: San Francisco
What it does: Fastly is an edge content delivery network, or CDN. It helps its customers speed up their websites and apps load — which has the pleasant side-effect of helping detect when inbound traffic is actually an attack of some kind, and warding it off.
Why it's hot: Fastly has come on strong in this well-established market, where it competes with fellow statup Cloudflare. Fastly already powers sites such as Airbnb, GitHub, Alaska Airlines, Pinterest, Vimeo, The Guardian, and the New York Times.
It reportedly broke the $100 million revenue mark in 2017, and in 2018, Fastly raised funding that included backing by the investment arm of telecom giant Deutsche Telekom.