X0306 4 2019-03-13 0 0001048695 F5 NETWORKS INC FFIV 0001764727 MEHTA NIKHIL RAMESH C/O F5 NETWORKS, INC. 401 ELLIOTT AVE. WEST SEATTLE WA 98119 1 0 0 0 Common Stock 2019-03-13 4 M 0 300 0.00 A 300 D Restricted Stock Unit 0.00 2019-03-13 4 M 0 300 0.00 D 2019-03-13 Common Stock 300 0 D Restricted Stock Unit 0.00 2019-03-14 4 A 0 1633 0.00 A Common Stock 1633 1633 D Shares received upon vesting of the February 1, 2019 award of Restricted Stock Units. Each Restricted Stock Unit represents a contingent right to receive one share of F5 Networks, Inc. Common Stock on the vest date. One share of Common Stock of F5 Networks, Inc. was delivered to the reporting person for each Restricted Stock Unit that vested on March 13, 2019. Restricted Stock Units will fully vest on the first business day prior to the date of the annual shareholder meeting for fiscal 2019 (to be held in 2020) if the reporting person continues to serve as a director on the vest date, and the corresponding number of shares of Common Stock of F5 Networks, Inc. will be issued to the reporting person on the vest date. /s/ Scot F. Rogers by Power of Attorney 2019-03-15