F5 Networks

F5 Networks, Inc. is a multinational American company which specializes in Application Delivery Networking (ADN) technology that optimizes the delivery of network-based applications and the security, performance, availability of servers, data storage devices, and other network resources. F5 is headquartered in Seattle, Washington and has development, manufacturing, and sales/marketing offices worldwide. F5 originally manufactured and sold some of the industry's first load balancing products. In 2010 and 2011, F5 Networks was on Fortune's list of 100 Fastest-Growing Companies worldwide. The company was also rated one of the top ten best-performing stocks by S&P 500 in 2010.

F5 offers products in various segments of the application delivery controller market. According to Gartner, in 2010 F5 had "a continued market-leading position" in the Application Delivery Controller (ADC) market and the Advanced Platform Application Delivery Controller market. As of June 2011, Gartner cites the most significant competitors (in terms of market share) as Cisco Systems, Citrix Systems, and Radware.