Hammerhead Networks was a computer networking company based in Billerica, Massachusetts. It produced software solutions for the delivery of Internet Protocol service features. History It was founded in April 2000 by Eddie Sullivan, who also served as its CEO. It was acquired by Cisco Systems on May 1, 2002, in a stock transaction worth up to US$173M. Cisco had previously owned a minority interest. It had 85 employees at the time of the acquisition. References Defunct software companies of the United States Networking companies of the United States Cisco Systems acquisitions Software companies based in Massachusetts Companies based in Billerica, Massachusetts Software companies established in 2000 Software companies disestablished in 2002 Defunct companies based in Massachusetts