NetScout Systems, Inc.

NetScout Systems makes software that helps internet service providers, mobile phone companies, and large enterprises monitor and protect their networks. Their main product, nGeniusONE, watches network traffic in real time to spot problems before they disrupt service. The company also sells cybersecurity tools, particularly their Arbor products, which defend against DDoS attacks (coordinated attempts to overwhelm networks with fake traffic). They gather and analyze the massive amounts of data flowing through networks to help customers optimize performance and catch security threats.