Cisco Systems Inc. (Nasdaq: CSCO) agreed to acquire AppDynamics Inc. for $3.7 billion, snapping up the fast-growing software maker just before it planned to go public.

Cisco, the world’s biggest maker of networking gear, will add AppDynamics’ software and services that help companies to monitor and fine-tune the performance of their own business systems. Businesses turning to SaaS has been one of the drivers in tech M&A. AppDynamics, based in San Francisco, was scheduled to price its initial public offering on Jan. 25 in this 2017’s first major U.S. technology IPO, according to data compiled by Bloomberg.

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