Google to Buy Cybersecurity Firm Mandiant for $5.4 Billion (2)

Google agreed to purchase cybersecurity company Mandiant Inc. for $5.4 billion, adding internet security products that will bolster the technology giant’s cloud-computing business as it takes on larger rivals Amazon Web Services and Microsoft Corp.

The acquisition, Google’s second-biggest ever, signals that the Alphabet Inc. company has stepped off the sidelines of large dealmaking despite intense regulatory scrutiny. As it seeks to expand its third-place cloud-infrastructure unit, which sells computing power and storage via the internet, buying Mandiant will give Google a fuller range of software tools to protect clients by responding quickly to online threats.

Building up the cloud ...