What Is Zscaler and How Does It Secure Enterprise Networks? The SASE company’s technology takes a zero-trust approach to protecting everything from your data center network to SaaS and users at home. Zscaler saw unprecedented growth last year, replacing legacy networking platforms with its scalable cloud-based alternative at breakneck speed. Today, the company serves more than a quarter of the Fortune 2000, with more than 150 data centers around the world, more than 20 million licensed seats, and 150 billion transactions per day – more than ten times that of Google. According to its quarterly earnings report released at the end of February, billing was up 71 percent compared to the previous year, and the company passed the 5,000-customer milestone.