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Last year, Seattle-based network security startup ExtraHop was riding high, quickly approaching $100 million in ARR and even making noises about a possible IPO in 2021. But there will be no IPO, at least for now, as the company announced this morning it has been acquired by a pair of private equity firms for $900 million.

The firms, Bain Capital Private Equity and Crosspoint Capital Partners, are buying a security solution that provides controls across a hybrid environment, something that could be useful as more companies find themselves in a position where they have some assets on-site and some in the cloud.

The company is part of the narrower Network Detection and Response (NDR) market. According to Jesse Rothstein, ExtraHop’s chief technology officer and co-founder, it’s a technology that is suited to today’s threat landscape, “I will say that ExtraHop’s north star has always really remained the same, and that has been around extracting intelligence from all of the network traffic in the wire data. This is where I think the network detection and response space is particularly well-suited to protecting against advanced threats,” he told TC.

The company uses analytics and machine learning to figure out if there are threats and where they are coming from, regardless of how customers are deploying infrastructure. Rothstein said he envisions a world where environments have become more distributed with less defined perimeters and more porous networks.

“So the ability to have this high quality detection and response capability utilizing next generation machine learning technology and behavioral analytics is so very important,” he said.

Max de Groen, managing partner at Bain, says his company was attracted to the NDR space, and saw ExtraHop as a key player. “As we looked at the NDR market, ExtraHop, which […] has spent 14 years building the product, really stood out as the best individual technology in the space,” de Groen told us.

Security remains a frothy market with lots of growth potential. We continue to see a mix of startups and established platform players jockeying for position, and private equity firms often try to establish a package of services. Last week, Symphony Technology Group bought FireEye’s product group for $1.2 billion, just a couple of months after snagging McAfee’s enterprise business for $4 billion as it tries to cobble together a comprehensive enterprise security solution.