Fastly's Largest Acquisition Ever — and What It Bought

In 2020, Fastly made a huge splash, dropping a staggering $775 million on its largest acquisition ever. But the deal wasn't for a rival or a flashy new product. It was for something much more fundamental to how the modern internet works.

First, Remind Me Who Fastly Is

Before we get to the shopping spree, let's talk about Fastly. If you've ever loaded a major news site, streamed a video, or shopped online, you've almost certainly used Fastly without knowing it. The company operates a content delivery network (CDN), which is a fancy way of saying it has servers all over the world that store copies of websites and applications. When you request a webpage, Fastly serves it from a server near you, making it load much faster than if the data had to travel all the way from the company's original server on the other side of the country. Think of it as Amazon building local warehouses for digital goods. This focus on speed and performance at the “edge” of the internet—close to users—is Fastly’s entire game.

The $775 Million Answer: Signal Sciences

So, what did Fastly buy for three-quarters of a billion dollars? A company called Signal Sciences. And what does Signal Sciences do? It builds a best-in-class Web Application Firewall, or WAF. If Fastly’s CDN is the network of express lanes for your website’s data, a WAF is the intelligent security guard standing at the entrance of every lane. It inspects incoming traffic for malicious activity—like hacking attempts, bot attacks, and data scraping—and blocks it before it can ever reach the application. What made Signal Sciences special was its developer-friendly approach. Instead of being a clunky, hard-to-configure security box that developers hated, its product was built to be integrated directly into modern software development workflows (a world known as DevOps), providing security that was both powerful and easy to manage.

Why It Was More Than Just a Security Purchase

This acquisition wasn't just about Fastly bolting on a new security feature. It was a fundamental shift in strategy. For years, the company's primary selling point was speed. But the internet had evolved. Being fast was no longer enough; you also had to be secure. By acquiring Signal Sciences, Fastly could integrate top-tier security directly into its edge network. This meant security decisions could be made at the same place where content was being delivered—right at the edge, milliseconds away from the user. This integration promised to solve a huge problem for developers: the trade-off between performance and security. Traditionally, adding strong security often meant slowing things down. Fastly's bet was that by owning both the delivery network and the security layer, it could offer speed *and* security, without compromise.

A Power Play in the Cloud Wars

The Signal Sciences deal was also a major competitive move. Fastly’s chief rival, Cloudflare, had long built its platform on the dual pillars of performance and security, offering them as a tightly integrated package. This acquisition was Fastly’s definitive answer, allowing it to compete head-to-head with Cloudflare’s comprehensive offering. Furthermore, it positioned Fastly as a more robust alternative to the security tools offered by cloud giants like Amazon Web Services (AWS), Google Cloud, and Microsoft Azure. Instead of being just a niche CDN player that companies used alongside other security vendors, Fastly was now pitching itself as a one-stop-shop for a secure, high-performance edge cloud platform. It was a bet that businesses would prefer a specialized, integrated solution for the edge rather than piecing together disparate services from larger, more complex providers.