FOR IMMEDIATE RELEASE

F5 Positioned in Leaders Quadrant of the Application Delivery Controller Magic Quadrant

Foremost industry analyst firm evaluates vendors in the Application Delivery Controller market based on ‘Completeness of Vision’ and ‘Ability to Execute’

SEATTLE, March 21, 2012

F5 Networks, Inc. (NASDAQ: FFIV), the global leader in Application Delivery Networking, announced today its position in the Leaders Quadrant of the 2010 Magic Quadrant for Application Delivery Controllers from Gartner, Inc.¹

Gartner’s Magic Quadrant for Application Delivery Controllers evaluates 13 vendors in the ADC market space based on Completeness of Vision and Ability to Execute. According to Gartner’s methodology, “A leader exhibits the ability to shape the market by introducing additional capabilities in its product offerings, and by raising awareness of the importance of these features. Key capabilities for a leader revolve around the Advanced Platform (AP) ADC capabilities that focus on enterprise application capabilities. We expect a leader to have strong or growing market share, especially in the AP ADCs, and to have solutions that resonate with an increasing number of enterprises. Expertise in complex data center application deployment also is a necessity to be a leader in the Magic Quadrant for ADCs.”

“We believe F5’s strong customer and partner relationships have helped us become a leader in the Magic Quadrant, as well as Gartner, Inc.’s worldwide market share rankings for the Application Delivery Controllers marketplace based on vendor revenue in Q2 of calendar year 2010². F5’s market execution and differentiation are the result of our ability to respond to the evolving needs of our customers. In addition, F5’s financial stability, the depth of our application expertise, the integration of key F5 software capabilities onto one platform, and DevCentral’s presence as the industry’s largest ADC-focused community continue to contribute to our success,” said Dan Matte, SVP of Marketing and Business Development at F5.

For other analyst coverage on F5, please visit www.f5.com/news-press-events/market-research/.

¹ Gartner, Inc., Magic Quadrant for Application Delivery Controllers, Mark Fabbi, Joe Skorupa, 18 November 2010.

² Gartner, Inc., Market Share: Application Acceleration Equipment, Worldwide, 2Q10, Joe Skorupa, Nhat Pham, 15 September 2010.