List of acquisitions by Cisco

The Cisco Systems campus in San Jose

Cisco Systems, Inc., commonly known as Cisco, is an American computer networking company. Cisco made its first acquisition in 1993, which was followed by a series of further acquisitions.

Founded in 1984, Cisco did not acquire a company during the first seven years of its existence; but, on September 24, 1993, Cisco acquired Crescendo Communications, a LAN switching company. Following the first Cisco takeover purchase, acquisitions have constituted 50 percent of the company's business activity.

The company's largest acquisition as of October 2023 is the purchase of Splunk—a software company that develops software for the analysis and monitoring of machine-generated data—US$28 billion. Cisco's previous largest acquisition was tied between Cerent Corporation and Scientific Atlanta for $6.9 billion in 1999 and 2005 respectively.

The majority of companies acquired by Cisco are based in the United States (U.S.) and a total of 149 companies had been acquired as of March 2011. Most of the companies acquired by Cisco are related to computer networking, with several LAN switching and Voice over Internet Protocol (VoIP) companies included in the list of acquisitions.

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